Optical system and camera module

Abstract

An optical system according to an embodiment of the present invention comprises, in order from an object side to an image side: a first lens having a negative (-) diopter; a second lens having a negative (-) diopter; a third lens having a positive (+) diopter; a fourth lens having a positive (+) diopter; a fifth lens element; a sixth lens; a seventh lens having a positive (+) diopter; an eighth lens; and a ninth lens.

Description

Technical Field

[0001] The teachings of exemplary and non - limiting embodiments of the present invention generally relate to an optical system for improving optical performance and a camera module including the optical system. Background Art

[0002] Recently, regarding image pickup systems, camera modules for communication terminals, digital still cameras (DSCs), camcorders, and PC cameras (imaging devices attached to personal computers) have been studied. Among the camera modules related to image pickup systems, one of the most core components for taking images is an imaging lens that forms an image.

[0003] Portable devices such as mobile phones or in - vehicle cameras are becoming increasingly miniaturized and / or lightweight. In line with this trend, imaging lenses are also being miniaturized. In addition, in addition to the miniaturization of imaging lenses, in response to the high performance of light - receiving elements, imaging lenses also need to have high performance. Summary of the Invention

[0004] Technical Problem

[0005] The present invention aims to provide an imaging lens capable of wide - angle shooting.

[0006] In addition, the present invention aims to provide a compact imaging lens suitable for high resolution.

[0007] In addition, the present invention aims to provide an imaging lens having excellent aberration characteristics and good aberration correction ability.

[0008] Technical Solution

[0009] To solve the above - mentioned technical problems, an optical system according to an embodiment of the present invention includes, in order from the object side to the sensor side: a first lens having a negative (-) diopter; a second lens having a positive (+) diopter; a third lens; a fourth lens having a negative (-) diopter; a fifth lens having a positive (+) diopter; a sixth lens; a seventh lens having a positive (+) diopter; an eighth lens having a negative (-) diopter; a ninth lens having a positive (+) diopter; and a tenth lens having a negative (-) diopter.

[0010] Preferably, but not necessarily, among the first lens to the tenth lens, the ninth lens may have the maximum thickness on the optical axis.

[0011] Preferably, but not necessarily, the thickness of the ninth lens on the optical axis may be greater than the thickness of the tenth lens on the optical axis.

[0012] Preferably, but not necessarily, the thickness of the ninth lens on the optical axis may be greater than the distance between the ninth lens and the tenth lens on the optical axis.

[0013] Preferably, but not necessarily, the thickness of the second lens along the optical axis may be greater than the distance between the seventh lens and the eighth lens along the optical axis.

[0014] Preferably, but not necessarily, the second lens may have a convex shape on both sides.

[0015] Preferably, but not necessarily, the tenth lens may have a meniscus shape convex toward the object side.

[0016] Preferably, but not necessarily, the following conditional expression may be satisfied:

[0017] <Conditional expression> 1 < TTL / F < 2

[0018] (In the above conditional expression, TTL refers to the distance from the object-side surface of the first lens to the image sensor on the optical axis, and F refers to the total focal length).

[0019] Preferably, but not necessarily, the following conditional expression may be satisfied:

[0020] <Conditional expression> 0.5 < TTL / ImgH * 2 < 0.9

[0021] (In the above conditions, TTL refers to the distance along the optical axis from the object-side surface of the first lens to the image sensor, and ImgH refers to the length of the image sensor in the diagonal direction on the optical axis).

[0022] Preferably, but not necessarily, the following conditional expression may be satisfied:

[0023] <Conditional expression> 4 < L10R1 / CT10 < 30

[0024] (In the above conditions, L10R1 represents the radius of curvature of the object-side surface of the tenth lens, and CT10 represents the thickness of the tenth lens on the optical axis).

[0025] To solve the above technical problems, an optical system according to another embodiment of the present invention may sequentially include, from the object side to the sensor side: a first lens, the first lens having a negative (-) diopter; a second lens, the second lens having a negative (-) diopter; a third lens, the third lens having a positive (+) diopter; a fourth lens, the fourth lens having a positive (+) diopter; a fifth lens; a sixth lens; a seventh lens, the seventh lens having a positive (+) diopter; an eighth lens; and a ninth lens.

[0026] Preferably, but not necessarily, along the optical axis, the thickness of the first lens among the first lens to the ninth lens may be the smallest.

[0027] Preferably, but not necessarily, among the first lens to the seventh lens, the absolute value of the focal length of the first lens may be the largest.

[0028] Preferably, but not necessarily, along the optical axis, the thickness of the first lens may be less than the thickness of the second lens.

[0029] Preferably, but not necessarily, the thickness of the sixth lens on the optical axis may be less than the thickness of the seventh lens on the optical axis.

[0030] Preferably, but not necessarily, the distance between the fifth lens and the sixth lens on the optical axis may be greater than the distance between the eighth lens and the ninth lens on the optical axis.

[0031] Preferably, but not necessarily, the fifth lens and the sixth lens may have a negative (minus) refractive power, and the eighth lens and the ninth lens may have a negative (minus) refractive power.

[0032] Preferably, but not necessarily, it may include: a first lens group including the first lens to the third lens; and a second lens group including the fourth lens to the ninth lens, and the focal length of the first lens group may be shorter than the focal length of the second lens group.

[0033] Preferably, but not necessarily, the absolute value of the difference between the focal length of the first lens group and the focal length of the second lens group may satisfy the conditional expression of 0 or more and 10 or less.

[0034] Preferably, but not necessarily, the following conditional expression may be satisfied:

[0035] <Conditional expression> 0.5 < TTL / ImgH*2 < 1

[0036] (In the above conditions, TTL represents the distance from the object side surface of the first lens to the image sensor on the optical axis, and ImgH represents the length of the image sensor in the diagonal direction on the optical axis).

[0037] Advantageous Effects

[0038] The optical system and the camera module according to the embodiment may have improved optical characteristics. Specifically, in the optical system according to the embodiment, the plurality of lenses may have set thicknesses, refractive powers, and intervals (spacings) between adjacent lenses. Therefore, the optical system and the camera module according to the embodiment may have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set field of view, and may have good optical performance in the peripheral region of the field of view.

[0039] In addition, the optical system and the camera module according to the embodiments can satisfy a specified field of view and achieve excellent optical characteristics. Accordingly, the optical system can provide a thinner camera module. Accordingly, the optical system and the camera module can be provided for various applications and devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a side cross-sectional view of an optical system according to a first embodiment and a camera module having the optical system.

[0041] Figure 2 is a table showing values of an aspherical coefficient and a conic constant (k) of each lens surface in the optical system according to the first embodiment.

[0042] Figure 3 is a table showing sag (Sag) values of an object side surface and a sensor side surface of a ninth lens and a tenth lens according to the first embodiment.

[0043] Figure 4 is a side cross-sectional view of an optical system according to a second embodiment and a camera module including the optical system.

[0044] Figure 5 is a table showing values of an aspherical coefficient and a conic constant (k) of each lens surface in the optical system according to the second embodiment.

[0045] Figure 6 is a table showing sag values of an object side surface and a sensor side surface of a ninth lens and a tenth lens according to the second embodiment.

[0046] Figure 7 is a side cross-sectional view of an optical system according to a third embodiment and a camera module including the optical system.

[0047] Figure 8 is a table showing values of an aspherical coefficient and a conic constant (k) of each lens surface in the optical system according to the third embodiment.

[0048] Figure 9 is a table showing sag values of an object side surface and a sensor side surface of a ninth lens and a tenth lens according to the third embodiment.

[0049] Figure 10 is a side cross-sectional view of an optical system according to a fourth embodiment and a camera module having the optical system.

[0050] Figure 11 is a table showing values of an aspherical coefficient and a conic constant (k) of each lens surface in the optical system according to the fourth embodiment.

[0051] Figure 12 It is a table showing the sagittal height values of the object side surface and the sensor side surface of the ninth lens and the tenth lens according to the fourth embodiment.

[0052] Figure 13 It is a side cross-sectional view of an optical system according to the fifth embodiment and a camera module having the optical system.

[0053] Figure 14 It is a table showing the aspherical coefficient and conic constant (k) values of each lens surface in the optical system according to the fifth embodiment.

[0054] Figure 15 It is a table showing the thickness of each lens and the interval (spacing) between adjacent lenses in the optical system according to the fifth embodiment.

[0055] Figure 16 It is a table showing the sagittal height values of each lens surface in the optical system according to the fifth embodiment.

[0056] Figure 17 It is a graph showing the data of the aberration characteristics of the optical system according to the fifth embodiment.

[0057] Figure 18 It is a graph showing the data of the diffraction MTF (modulation transfer function) of the optical system according to the fifth embodiment.

[0058] Figure 19 It is a side cross-sectional view of an optical system according to the sixth embodiment and a camera module having the optical system.

[0059] Figure 20 It is a table showing the aspherical coefficient and conic constant (k) values of each lens surface in the optical system according to the sixth embodiment.

[0060] Figure 21 It is a table showing the thickness of each lens and the spacing between adjacent lenses in the optical system according to the sixth embodiment.

[0061] Figure 22 It is a table showing the sagittal height values of each lens surface in the optical system according to the sixth embodiment.

[0062] Figure 23 It is a graph showing the data of the aberration characteristics of the optical system according to the sixth embodiment.

[0063] Figure 24 It is a graph showing the data of the diffraction MTF (modulation transfer function) of the optical system according to the sixth embodiment.

[0064] Figure 25A side cross-sectional view of an optical system according to a seventh embodiment and a camera module including the optical system.

[0065] Figure 26 A table showing the aspherical coefficient and conic constant (k) values of each lens surface in the optical system according to the seventh embodiment.

[0066] Figure 27 A table showing the thickness of each lens and the spacing between adjacent lenses in the optical system according to the seventh embodiment.

[0067] Figure 28 A table showing the sagittal height values of each lens surface in the optical system according to the seventh embodiment.

[0068] Figure 29 A graph showing data of aberration characteristics of the optical system according to the seventh embodiment.

[0069] Figure 30 A graph showing data of diffraction MTF (modulation transfer function) of the optical system according to the seventh embodiment.

[0070] Figure 31 An exploded perspective view of a camera module according to the present embodiment. DETAILED DESCRIPTION

[0071] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0072] However, the present invention is not limited to the given exemplary embodiments described, but can be implemented in various different forms, and within the scope of the present invention, one or more components in the exemplary embodiments can be selectively combined or replaced between the embodiments.

[0073] In addition, unless specifically defined and described explicitly, the terms (including technical terms and scientific terms) used in the embodiments of the present invention are interpreted as meanings that would be understood by those of ordinary skill in the art to which the present invention pertains, and the commonly used terms (such as dictionary-defined terms) are interpreted according to their contextual meanings in the relevant field.

[0074] In addition, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0075] In this specification, unless the context requires otherwise, the singular may include the plural, and referring to "at least one (or more) of A and (or) B and C" may include more than one of any combination in which A, B, and C can be combined.

[0076] In addition, terms such as first, second, A, B, (a), (b), etc. may be used to describe components of embodiments of the present invention. These terms are only intended to distinguish one component from another, and are not intended to limit the nature or order or sequence of these components by these terms.

[0077] In addition, when a component is described as "connected", "coupled" or "attached" to another component, it may include the case where the component is directly "connected", "coupled" or "attached" to another component, and the case where the component is "connected", "coupled" or "attached" to another component located between the component and the other component.

[0078] In addition, when described as being "above" or "below" each component, "above" or "below" includes not only the case where the two components are in direct contact with each other, but also the case where more than one other component is formed or disposed between the two components. In addition, when expressed as "above" or "below", it may include the meanings of upward and downward with respect to a single component.

[0079] In the description of the present invention, the "object-side surface" may refer to the surface of the lens facing the object side with respect to the optical axis OA, and the "sensor-side surface" may refer to the surface of the lens facing the imaging surface (image sensor) with respect to the optical axis. The "object-side surface" may be referred to as the "object surface", and the "sensor-side surface" may be referred to as the "image surface". The convex surface of the lens may refer to a convex shape on the optical axis or in the paraxial region, and the concave surface of the lens may refer to a concave shape on the optical axis or in the paraxial region portion. The radius of curvature, the center thickness, and the optical axis interval (spacing) between the lenses listed in the lens data table may refer to the values measured along the optical axis (unit: mm). The vertical direction may refer to the direction perpendicular to the optical axis, and the end of the lens or the lens surface may refer to the end of the effective region through which the incident light of the lens passes. Depending on the measurement method, the size of the effective diameter of the lens surface may have a measurement error of up to ±0.4 mm. The term "paraxial region" refers to a very narrow region near the optical axis, in which the distance from the optical axis OA to the light ray is almost zero. Hereinafter, the term "optical axis" may refer to the center of each lens or a very narrow region near the optical axis.

[0080] The effective diameter is the diameter of the effective light entering the effective area (section) of each lens. The effective diameter is the length in the direction (X, Y) perpendicular to the optical axis, and is the average of the effective diameters of the object side surface and the sensor side surface of each lens. "Lens surface diameter" may refer to "the effective diameter of the lens". "Lens diameter" may refer to the total diameter of the lens, including the flange portion outside the effective area of the lens. Although the flange of the lens is not shown in the drawings, the flange may be a portion protruding from the side surface of the lens in the direction perpendicular to the optical axis to attach the lens to the lens barrel. The flange may not allow the effective light to enter. A spacer may be additionally provided between the flanges of different lenses to attach the lens to the lens barrel.

[0081] Each lens may include an effective area and an ineffective area. The effective area may be the area through which the light incident on each lens passes. In other words, the effective area may be defined as the effective area or effective path where the incident light is refracted to achieve the optical characteristics. The ineffective area may be arranged around the effective area. The ineffective area may be an area where the effective light in multiple lenses does not enter. In other words, the ineffective area may be an area irrelevant to the optical characteristics. In addition, the edge of the ineffective area may be an area fixed to the lens barrel or other structures that accommodate the lens.

[0082] The configuration of the optical system according to the first embodiment of the present invention will be described below with reference to the drawings.

[0083] Figure 1 is a side cross-sectional view of the optical system according to the first embodiment and a camera module having the optical system.

[0084] The optical system according to the first embodiment may include a lens unit, and the lens unit may include a first lens 101 to a tenth lens 110. The first lens to the tenth lens 101, 102, 103, 104, 105, 106, 107, 108, 109, 110 may be sequentially arranged along the optical axis OA. The light corresponding to the information of the object may pass through the first lens 101 to the tenth lens 110 and the filter 900, and enter the image sensor 800. The lens unit may sequentially arrange the first lens 101, the aperture STOP, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, the seventh lens 107, the eighth lens 108, the ninth lens 109, and the tenth lens 110 from the object side to the image side. The imaging lens according to the first embodiment may be composed of eight or fewer lenses. Alternatively, the imaging lens according to the first embodiment may be composed of nine or more lenses.

[0085] In other embodiments, more than one additional lens, plate, or optical element may be added between the first lens 101 and the tenth lens 110. In addition, more than one additional lens, plate, or optical element may be added before the first lens 101 or after the tenth lens 110. In addition, more than one additional lens, plate, or optical element may be added between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter 900 may be a flat lens. The diopter of the flat lens may be "0". The diopter of the flat lens may be zero. In addition, a filter layer may be provided between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter layer may be coated to be used as a filter.

[0086] The lens unit may include a first lens 101. The first lens 101 may be closest to the object side. The first lens 101 may be the first lens disposed on the object side. The first lens 101 may be the first lens adjacent to the object side. An additional lens may be disposed between the first lens 101 and the second lens 102. The second lens to the eighth lens 102, 103, 104, 105, 106, 107, 108 may be disposed between the first lens 101 and the tenth lens 110. Between the first lens 101 and the tenth lens 110, an additional lens other than the second lens to the ninth lens 102, 103, 104, 105, 106, 107, 108, 109 may be disposed. At least two lenses may be additionally disposed between the first lens to the tenth lens 101, 102, 103, 104, 105, 106, 107, 108, 109, 110.

[0087] The first lens 101 may have a negative (minus) diopter. The first lens 101 may have a convex meniscus shape on the object side. The first lens 101 may have an object-side surface S1 convexly formed. The first lens 101 may have an object-side surface S1 convexly formed with respect to the optical axis. The first lens 101 may have a concave upper-side surface S2. The first lens 101 may have an upper-side surface S2 concave with respect to the optical axis. The object-side surface or the upper-side surface of the first lens 101 may include at least one inflection point.

[0088] The radius of curvature of the object-side surface S1 of the first lens 101 can be a positive number. The radius of curvature of the object-side surface S1 of the first lens 101 with respect to the optical axis can be a positive number. The radius of curvature of the upper-side surface S2 of the first lens 101 can be a positive number. The radius of curvature of the upper-side surface S2 of the first lens 101 along the optical axis can be a positive number. The absolute value of the radius of curvature of the object-side surface S1 of the first lens 101 can be greater than the absolute value of the radius of curvature of the upper-side surface S2 of the first lens 101. The first lens 101 can be a solid lens. The two surfaces of the first lens 101 can be formed as aspherical surfaces. One of the two surfaces of the first lens 101 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface.

[0089] The first lens 101 can satisfy the range of 1.5 < N1 < 1.6. In addition, the first lens 101 can satisfy the range of 1.52 < N1 < 1.58. N1 is the refractive index of the first lens 101. The first lens 101 can satisfy the range of 50 < V1 < 60. In addition, the first lens 101 can satisfy the range of 52 < V1 < 58. V1 is the Abbe number of the first lens 101.

[0090] The lens unit can include a second lens 102. The second lens 102 can be the second lens arranged starting from the object side. The second lens 102 can be the second lens adjacent to the first lens and starting from the object side. The second lens 102 can be arranged between the first lens 101 and the image side. The second lens 102 can be arranged between the first lens 101 and the third lens 103. An additional lens can be arranged between the second lens 102 and the first lens 101 or between the second lens 102 and the third lens 103.

[0091] The second lens 102 can have a positive (+) diopter. The second lens 102 can be formed with two convex surfaces. The second lens 102 can be formed with a convex object-side surface S3. The second lens 102 can be formed with an object-side surface S3 that is convex with respect to the optical axis. The second lens 102 can have an upper-side surface S4 formed concavely. The second lens 102 can have an upper-side surface S4 formed concavely with respect to the optical axis. The object-side surface S3 or the upper-side surface S4 of the second lens 102 can include at least one inflection point.

[0092] The radius of curvature of the object-side surface S3 of the second lens 102 may be a positive number. The radius of curvature of the object-side surface S3 of the second lens 102 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S4 of the second lens 102 may be a negative number. The radius of curvature of the upper-side surface S4 of the second lens 102 on the optical axis may be a negative number. The absolute value of the radius of curvature of the object-side surface S3 of the second lens 102 may be smaller than the absolute value of the radius of curvature of the upper-side surface S4 of the second lens 102. The second lens 102 may be a solid lens. The two surfaces of the second lens 102 may be formed as aspherical surfaces. One of the two surfaces of the second lens 102 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0093] The second lens 102 may satisfy the range of 1.5 < N2 < 1.6. In addition, the second lens 102 may satisfy the range of 1.52 < N2 < 1.58. N2 is the refractive index of the second lens 102. The second lens 102 may satisfy the range of 50 < V2 < 60. In addition, the second lens 102 may satisfy the range of 55 < V2 < 58. V2 is the Abbe number of the second lens 102.

[0094] The lens unit may include a third lens 103. The third lens 103 may be the third lens arranged starting from the object side. The third lens 103 may be the third lens adjacent to the object side. The third lens 103 may be arranged between the second lens 102 and the image side. The third lens 103 may be arranged between the second lens 102 and the fourth lens 104. An additional lens may be arranged between the third lens 103 and the second lens 102 or between the third lens 103 and the fourth lens 104.

[0095] The third lens 103 may have a positive (+) diopter. The third lens 103 may be formed with two convex side surfaces. The third lens 103 may be formed with a convex object-side surface S5. The third lens 103 may be formed with an object-side surface S5 convex with respect to the optical axis. The third lens 103 may have an upper-side surface S6 formed convexly. The third lens 103 may have an upper-side surface S6 formed convexly with respect to the optical axis. The object-side surface or the upper-side surface of the third lens 103 may include at least one inflection point.

[0096] The radius of curvature of the object-side surface S5 of the third lens 103 may be positive. The radius of curvature of the object-side surface S5 of the third lens 103 with respect to the optical axis may be positive. The radius of curvature of the upper-side surface S6 of the third lens 103 may be negative. The radius of curvature of the upper-side surface S6 of the third lens 103 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the third lens 103 may be greater than the absolute value of the radius of curvature of the upper-side surface of the third lens 104. The third lens 103 may be a solid lens. The two surfaces of the third lens 103 may be formed as aspherical surfaces. One of the two surfaces of the third lens 103 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0097] The third lens 103 may satisfy the range of 1.5 < N3 < 1.6. In addition, the third lens 103 may satisfy the range of 1.52 < N3 < 1.58. N3 is the refractive index of the third lens 103. The third lens 103 may satisfy the range of 50 < V3 < 60. In addition, the third lens 103 may satisfy the range of 52 < V3 < 58. V3 is the Abbe number of the third lens 103.

[0098] The lens unit may include a fourth lens 104. The fourth lens 104 may be the fourth lens provided from the object side. The fourth lens 104 may be the seventh lens provided from the image side. The fourth lens 104 may be disposed between the third lens 103 and the image side. The fourth lens 104 may be disposed between the third lens 103 and the fifth lens 105. An additional lens may be disposed between the fourth lens 104 and the third lens 103 or between the fourth lens 104 and the fifth lens 105.

[0099] The fourth lens 104 may have a negative (minus) diopter. The fourth lens 104 may have a convex meniscus shape on the object side. The fourth lens 104 may have a convex object-side surface S7. The fourth lens 104 may have an object-side surface S7 that is convex with respect to the optical axis. The fourth lens 104 may have a concave upper-side surface S8. The fourth lens 104 may have an upper-side surface S8 that is concave with respect to the optical axis. The object-side surface or the upper-side surface of the fourth lens 104 may include at least one inflection point.

[0100] The radius of curvature of the object-side surface S7 of the fourth lens 104 may be a positive number. The radius of curvature of the object-side surface S7 of the fourth lens 104 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S8 of the fourth lens 104 may be a positive number. The radius of curvature of the upper-side surface S8 of the fourth lens 104 on the optical axis may be a positive number. The absolute value of the radius of curvature of the object-side surface S7 of the fourth lens 104 may be greater than the absolute value of the radius of curvature of the upper-side surface S8 of the fourth lens 104. The fourth lens 104 may be a solid lens. The two surfaces of the fourth lens 104 may be formed as aspherical surfaces. One of the two surfaces of the fourth lens 104 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0101] The fourth lens 104 may satisfy the range of 1.6 < N4 < 1.7. In addition, the fourth lens 104 may satisfy the range of 1.65 < N4 < 1.7. N4 is the refractive index of the fourth lens 104. The fourth lens 104 may satisfy the range of 15 < V4 < 30. In addition, the fourth lens 104 may satisfy the range of 17 < V4 < 20. V4 is the Abbe number of the fourth lens 104.

[0102] The lens unit may include a fifth lens 105. The fifth lens 105 may be the fifth lens arranged starting from the object side. The fifth lens 105 may be the sixth lens arranged starting from the image side. The fifth lens 105 may be arranged between the fourth lens 104 and the upper side. The fifth lens 105 may be arranged between the fourth lens 104 and the sixth lens 106. An additional lens may be arranged between the fifth lens 105 and the fourth lens 104 or between the fifth lens 105 and the sixth lens 106.

[0103] The fifth lens 105 may have a positive (+) diopter. The fifth lens 105 may have a convex shape on both sides. The fifth lens 105 may have a convex object-side surface S9. The fifth lens 105 may have an object-side surface S9 that is convex with respect to the optical axis. The fifth lens 105 may have a convexly formed upper-side surface S10. The fifth lens 105 may have an upper-side surface S10 that is convex with respect to the optical axis. The object-side surface or the upper-side surface of the fifth lens 105 may include at least one inflection point.

[0104] The radius of curvature of the object-side surface S9 of the fifth lens 105 can be a positive number. The radius of curvature of the object-side surface S9 of the fifth lens 105 with respect to the optical axis can be a positive number. The radius of curvature of the upper-side surface S10 of the fifth lens 105 can be a negative number. The radius of curvature of the upper-side surface S10 of the fifth lens 105 along the optical axis can be a negative number. The absolute value of the radius of curvature of the object-side surface S9 of the fifth lens 105 can be greater than the absolute value of the radius of curvature of the upper-side surface S10 of the fifth lens 105. The fifth lens 105 can be a solid lens. The two surfaces of the fifth lens 105 can be formed as aspherical surfaces. One of the two surfaces of the fifth lens 105 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface.

[0105] The fifth lens 105 can satisfy the range of 1.5 < N5 < 1.6. In addition, the fifth lens 105 can satisfy the range of 1.52 < N5 < 1.58. N5 is the refractive index of the fifth lens 105. The fifth lens 105 can satisfy the range of 50 < V5 < 60. In addition, the fifth lens 105 can satisfy the range of 52 < V5 < 58. V5 is the Abbe number of the fifth lens 105.

[0106] The lens unit can include a sixth lens 106. The sixth lens 106 can be the sixth lens arranged from the object side. The sixth lens 106 can be the fifth lens arranged from the image side. The sixth lens 106 can be arranged between the fifth lens 105 and the seventh lens 107. The sixth lens 106 can be arranged between the fifth lens 105 and the image side. An additional lens can be arranged between the sixth lens 106 and the fifth lens 105 or between the sixth lens 106 and the seventh lens 107.

[0107] The sixth lens 106 can have a positive (+) diopter. The sixth lens 106 can have a convex meniscus shape on the image side. The sixth lens 106 can have an object-side surface S11 formed concavely. The sixth lens 106 can have an object-side surface S11 formed concavely with respect to the optical axis. The sixth lens 106 can have an upper-side surface S12 formed convexly. The sixth lens 106 can have an upper-side surface S12 convex with respect to the optical axis. The object-side surface or the upper-side surface of the sixth lens 106 can include at least one inflection point.

[0108] The radius of curvature of the object-side surface S11 of the sixth lens 106 can be negative. The radius of curvature of the object-side surface S11 of the sixth lens 106 with respect to the optical axis can be negative. The radius of curvature of the upper-side surface S12 of the sixth lens 106 can be negative. The radius of curvature of the upper-side surface S12 of the sixth lens 106 along the optical axis can be negative. The absolute value of the radius of curvature of the object-side surface of the sixth lens 106 can be greater than the absolute value of the radius of curvature of the upper-side surface of the sixth lens 106. The sixth lens 106 can be a solid lens. The two surfaces of the sixth lens 106 can be formed as aspherical surfaces. One of the two surfaces of the sixth lens 106 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface. The sixth lens 106 can have a surface including more than one inflection point.

[0109] The sixth lens 106 can satisfy the range of 1.5 < N6 < 1.6. In addition, the sixth lens 106 can satisfy the range of 1.52 < N6 < 1.58. N6 is the refractive index of the sixth lens 106. The sixth lens 106 can satisfy the range of 50 < V6 < 60. In addition, the sixth lens 106 can satisfy the range of 52 < V6 < 58. V6 is the Abbe number of the sixth lens 106.

[0110] The lens unit can include a seventh lens 107. The seventh lens 107 can be the seventh lens arranged from the object side. The seventh lens 107 can be the fourth lens arranged from the image side. The seventh lens 107 can be arranged between the sixth lens 106 and the eighth lens 108. The seventh lens 107 can be arranged between the sixth lens 106 and the image side. An additional lens can be arranged between the seventh lens 107 and the sixth lens 106 or between the seventh lens 107 and the eighth lens 108.

[0111] The seventh lens 107 can have a positive (+) refractive power. The seventh lens 107 can have a convex meniscus shape on the image side. The seventh lens 107 can have an object-side surface S13 formed concavely. The seventh lens 107 can have an object-side surface S13 formed concavely with respect to the optical axis. The seventh lens 107 can have an upper-side surface S14 formed convexly. The seventh lens 107 can have an upper-side surface S14 convex with respect to the optical axis. The object-side surface or the upper-side surface of the seventh lens 107 can include at least one inflection point.

[0112] The radius of curvature of the object-side surface S13 of the seventh lens 107 may be negative. The radius of curvature of the object-side surface S13 of the seventh lens 107 with respect to the optical axis may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 107 may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 107 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the seventh lens 107 may be greater than the absolute value of the radius of curvature of the upper-side surface of the seventh lens 107. The seventh lens 107 may be a solid lens. The two surfaces of the seventh lens 107 may be formed as aspherical surfaces. One of the two surfaces of the seventh lens 107 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The seventh lens 107 may have a surface including more than one inflection point.

[0113] The seventh lens 107 may satisfy the range of 1.5 < N7 < 1.6. In addition, the seventh lens 107 may satisfy the range of 1.52 < N7 < 1.58. N7 is the refractive index of the seventh lens 107. The seventh lens 107 may satisfy the range of 50 < V7 < 60. In addition, the seventh lens 107 may satisfy the range of 52 < V7 < 58. V6 is the Abbe number of the seventh lens 107.

[0114] The lens unit may include an eighth lens 108. The eighth lens 108 may be the eighth lens arranged starting from the object side. The eighth lens 108 may be the third lens arranged starting from the image side. The eighth lens 108 may be arranged between the seventh lens 107 and the ninth lens 109. The eighth lens 108 may be arranged between the seventh lens 107 and the image side. An additional lens may be arranged between the eighth lens 108 and the seventh lens 107 or between the eighth lens 108 and the ninth lens 109.

[0115] The eighth lens 108 may have a negative (minus) diopter. The eighth lens 108 may have a recessed shape on both sides. The eighth lens 108 may have an object-side surface S15 formed in a recessed manner. The eighth lens 108 may have an object-side surface S15 formed to protrude with respect to the optical axis. The eighth lens 108 may have an upper-side surface S16 formed in a recessed manner. The eighth lens 108 may have an upper-side surface S16 formed to be recessed with respect to the optical axis. The object-side surface or the upper-side surface of the eighth lens 108 may include at least one inflection point.

[0116] The radius of curvature of the object-side surface S15 of the eighth lens 108 may be negative.

[0117] The radius of curvature of the object-side surface S16 of the eighth lens 108 on the optical axis may be negative. The radius of curvature of the upper-side surface S16 of the eighth lens 108 may be positive. The radius of curvature of the upper-side surface S16 of the eighth lens 108 on the optical axis may be positive. The value of the radius of curvature of the object-side surface of the eighth lens 108 may be greater than the value of the radius of curvature of the upper-side surface of the eighth lens 108. The eighth lens 108 may be a solid lens. Both sides of the eighth lens 108 may be formed as aspherical surfaces. One of the two surfaces of the eighth lens 108 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The eighth lens 108 may have a surface including one or more inflection points.

[0118] The eighth lens 108 may satisfy the range of 1.6 < N8 < 1.7. In addition, the eighth lens 108 may satisfy the range of 1.65 < N8 < 1.7. N8 is the refractive index of the eighth lens 108. The eighth lens 108 may satisfy the range of 10 < V8 < 25. In addition, the eighth lens 108 may satisfy the range of 15 < V8 < 20. V8 is the Abbe number of the eighth lens 108.

[0119] The lens unit may include a ninth lens 109. The ninth lens 109 may be the ninth lens arranged starting from the object side. The ninth lens 109 may be the second lens arranged starting from the image side. The ninth lens 109 may be arranged between the eighth lens 108 and the tenth lens 110. The ninth lens 109 may be arranged between the eighth lens 108 and the image side. An additional lens may be arranged between the ninth lens 109 and the eighth lens 108 or between the ninth lens 109 and the tenth lens 110.

[0120] The ninth lens 109 may have a positive (+) diopter. The ninth lens 109 may have a convex meniscus shape on the object side. The ninth lens 109 may have an object-side surface S17 formed convexly. The ninth lens 109 may have an object-side surface S17 formed convexly with respect to the optical axis. The ninth lens 109 may have an upper-side surface S18 formed concavely. The ninth lens 109 may have an upper-side surface S18 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the ninth lens 109 may include at least one inflection point.

[0121] The radius of curvature of the object-side surface S17 of the ninth lens 109 can be a positive number. The radius of curvature of the object-side surface S17 of the ninth lens 109 with respect to the optical axis can be a positive number. The radius of curvature of the upper-side surface S18 of the ninth lens 109 can be a positive number. The radius of curvature of the upper-side surface S18 of the ninth lens 109 along the optical axis can be a positive number. The value of the radius of curvature of the object-side surface of the ninth lens 109 can be less than the value of the radius of curvature of the upper-side surface of the ninth lens 109. The ninth lens 109 can be a solid lens. The two surfaces of the ninth lens 109 can be formed as aspherical surfaces. One of the two surfaces of the ninth lens 109 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface. The ninth lens 109 can have a surface including more than one inflection point.

[0122] The ninth lens 109 can satisfy the range of 1.6 < N9 < 1.7. In addition, the ninth lens 109 can satisfy the range of 1.65 < N9 < 1.7. N9 is the refractive index of the ninth lens 109. The ninth lens 109 can satisfy the range of 20 < V9 < 30. In addition, the ninth lens 109 can satisfy the range of 22 < V9 < 28. V9 is the Abbe number of the ninth lens 109.

[0123] The lens unit can include a tenth lens 110. The tenth lens 110 can be the lens closest to the image side. The tenth lens 110 can be disposed between the ninth lens 109 and the image side. An additional lens can be disposed between the tenth lens 110 and the ninth lens 109 or between the tenth lens 110 and the filter 900.

[0124] The tenth lens 110 can have a negative (minus) refractive power. The tenth lens 110 can have a convex meniscus shape on the object side. The tenth lens 110 can have an object-side surface S19 formed convexly. The tenth lens 110 can have an object-side surface S19 formed convexly with respect to the optical axis. The tenth lens 110 can have an upper-side surface S20 formed concavely. The tenth lens 110 can have an upper-side surface S20 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the tenth lens 110 can include at least one inflection point.

[0125] The radius of curvature of the object-side surface S19 of the tenth lens 110 can be a positive number. The radius of curvature of the object-side surface S19 of the tenth lens 110 with respect to the optical axis can be a positive number. The radius of curvature of the upper-side surface S20 of the tenth lens 110 can be a positive number.

[0126] The radius of curvature of the upper surface S20 of the tenth lens 110 on the optical axis can be a positive number. The value of the radius of curvature of the object-side surface of the tenth lens 110 can be greater than the value of the radius of curvature of the upper surface of the tenth lens 110. The tenth lens 110 can be a solid lens. The two surfaces of the tenth lens 110 can be formed as aspherical surfaces. One of the two surfaces of the tenth lens 110 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface. The tenth lens 110 can have a surface including one or more inflection points.

[0127] The tenth lens 110 can satisfy the range of 1.5 < N10 < 1.6. In addition, the tenth lens 110 can satisfy the range of 1.52 < N10 < 1.55. N10 is the refractive index of the tenth lens 110. The tenth lens 110 can satisfy the range of 50 < V10 < 60. In addition, the tenth lens 110 can satisfy the range of 52 < V10 < 58. V10 is the Abbe number of the tenth lens 110.

[0128] The lens unit can include an aperture STOP. The aperture can control the amount of light entering the optical system. Among the lenses located between the object and the aperture, the effective diameter of the lens surface tends to increase from the object to the aperture. For the lens surface provided between the aperture and the sensor, the effective diameter of the lens surface has a tendency to decrease from the aperture to the sensor side. The fact that the effective diameter of the lens surface has a tendency to increase or decrease does not mean that the effective diameter of the lens surface only increases or decreases. For example, this also includes the case where the effective diameter of the lens surface increases from the aperture to the sensor side and then decreases.

[0129] The aperture STOP can be provided between the first lens 101 and the second lens 102. The aperture STOP can be set to be closer to the second lens 102 relative to the first lens 101. The aperture STOP can be spaced apart from the object-side surface of the first lens 101. The aperture STOP can adjust the amount of light entering from the subject. The aperture STOP can adjust the amount of light passing through the first lens 101. The aperture STOP can adjust the amount of light entering the second lens 102. The aperture STOP can include a diameter aperture.

[0130] The optical system or the camera module can include a filter 900. The filter 900 can be provided between the lens closest to the sensor side among the lenses of the lens unit 100 and the image sensor 800. For example, the filter 900 can be provided between the nth lens and the image sensor 800.

[0131] A cover glass can be provided between the filter 900 and the image sensor 800 to protect the upper part of the image sensor 800 and prevent a reduction in the reliability of the image sensor 800. The cover glass can be removed. The cover glass can be used as a protective glass.

[0132] The filter 900 may include an infrared filter or an infrared cut-off filter. The filter 900 may transmit light within a set wavelength band and filter out light of other wavelength bands. When the filter 900 includes an infrared filter, it may block radiant heat emitted from external light from being transferred to the image sensor 800. In addition, the filter 900 may transmit visible light and reflect infrared light.

[0133] The concept of the diagonal field of view (DFOV) of the imaging lens according to the present embodiment will be described below.

[0134] The imaging lens may have a field of view (FOV) of more than 70°. In this case, the field of view (FOV) may be the diagonal field of view (DFOV). The diagonal field of view (DFOV) may be different from the horizontal field of view (HFOV) and the vertical field of view (VFOV). For example, the horizontal field of view (HFOV) may be 0.8 times the diagonal field of view (DFOV). In addition, the field of view (FOV) may be different from the horizontal field of view (HFOV). The field of view (FOV) refers to the diameter of an imaginary circle connecting the four corners of the image sensor, while the horizontal field of view (HFOV) may refer to the radius of the above imaginary circle. In other words, the field of view (FOV) may be twice the horizontal field of view (HFOV).

[0135] The diagonal field of view (DFOV) can be calculated using the following mathematical equation.

[0136] [Mathematical equation]

[0137] DFOV = 2 * arctan(ImgH / F)

[0138] Here, ImgH * 2 refers to the diagonal length of the effective area of the imaging surface of the image sensor 800, and F refers to the effective focal length of the entire optical system.

[0139] [Table 1]

[0140]

[0141]

[0142] Table 1 shows the surface number (surface), radius of curvature (radius), center thickness of each lens or distance between lens surfaces (thickness), refractive index (nd), Abbe number (vd), effective radius (semi-aperture), and focal length of the lens according to the first embodiment of the present invention. Here, the unit of the radius of curvature and the thickness or distance may be mm.

[0143] Figure 3A table showing the sagittal height values of the object side surface and the sensor side surface of the ninth lens and the tenth lens according to the first embodiment of the present invention.

[0144] The seventeenth surface S17 on the object side and the eighteenth surface S18 on the sensor side of the ninth lens 109 may each have at least one critical point from the optical axis OA to the end of the effective area. The eighteenth surface S18 on the sensor side of the ninth lens 109 may have a critical point at a point where the Y value from the optical axis OA is 0.8 mm to 1.0 mm. If the eighteenth surface S18 on the sensor side of the ninth lens 109 has a critical point, the critical point may be located within a range of 30% to 40% of the effective radius from the optical axis OA.

[0145] The nineteenth surface S19 on the object side and the twentieth surface S20 on the sensor side of the tenth lens 110 may each have at least one critical point from the optical axis OA to the end of the effective area. The nineteenth surface S19 on the object side of the tenth lens 110 may have a critical point at a point where the Y value from the optical axis OA is 3.1 mm to 3.2 mm. Here, Y represents the distance in a direction perpendicular to the optical axis OA. When the nineteenth surface S19 on the object side of the tenth lens 110 has a critical point, the critical point may be located within a range of more than 90% and less than 95% of the effective radius from the optical axis OA. The twentieth surface S20 on the sensor side of the tenth lens 110 may have a critical point at a point where the Y value from the optical axis OA is between 1.7 mm and 1.8 mm. If the twentieth surface S20 on the sensor side of the tenth lens 110 has a critical point, the critical point may be located within a range of more than 40% but less than 50% of the effective radius from the optical axis OA.

[0146]

Table 2

[0147] First Embodiment TTL 6.05 F 4.71 Fno 2.2 ImgH*2 8.2 FOV 73.7

[0148] Table 2 shows the characteristics of the imaging lens according to the first embodiment of the present invention.

[0149] TTL represents the optical axis distance from the vertex of the object side surface of the first lens 101 to the image surface, F represents the total focal length, Fno represents the ratio of the focal length of the lens to the effective diameter, ImgH represents the distance from the optical axis OA to the diagonal end of the image sensor 800 or half of the maximum diagonal length, and FOV represents the field of view in the diagonal direction of the optical system. Here, the units of TTL, F, and ImgH may be mm, and the unit of FOV may be degrees.

[0150] The configuration of the optical system according to the second embodiment of the present invention will be described below with reference to the accompanying drawings.

[0151] Figure 4 A side cross-sectional view of the optical system according to the second embodiment and a camera module having the optical system.

[0152] The optical system according to the second embodiment may include a lens unit, and the lens unit may include a first lens 201 to a tenth lens 210. The first lens to the tenth lens 201, 202, 203, 204, 205, 206, 207, 208, 209, 210 may be sequentially arranged along the optical axis OA. Light corresponding to the information of the object may pass through the first lens 201 to the tenth lens 210 and the filter 900, and enter the image sensor 800.

[0153] The lens unit may be sequentially arranged from the object side to the image side as the first lens 201, the aperture STOP, the second lens 202, the third lens 203, the fourth lens 204, the fifth lens 205, the sixth lens 206, the seventh lens 207, the eighth lens 208, the ninth lens 209, and the tenth lens 210. The imaging lens according to the second embodiment may be composed of less than eight lenses. Alternatively, the imaging lens according to the second embodiment may be composed of nine or more lenses.

[0154] In other embodiments, one or more additional lenses, plates, or optical elements may be added between the first lens 201 and the tenth lens 210. In addition, one or more additional lenses, plates, or optical members may be added before the first lens 201 or after the tenth lens 210. In addition, one or more additional lenses, plates, or optical members may be added between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter 900 may be a flat lens. The diopter of the flat lens may be "0". The diopter of the flat lens may be zero. In addition, a filter layer may be provided between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter layer may be coated to be used as a filter.

[0155] The lens unit may include the first lens 201. The first lens 201 may be closest to the object side. The first lens 201 may be the first lens arranged on the object side. The first lens 201 may be the first lens adjacent to the object side.

[0156] An additional lens may be disposed between the first lens 201 and the second lens 202. The second lens to the eighth lens 202, 203, 204, 205, 206, 207, 208 may be disposed between the first lens 201 and the tenth lens 210. Between the first lens 201 and the tenth lens 210, other lenses other than the second lens to the ninth lens 202, 203, 204, 205, 206, 207, 208, 209 may be additionally disposed. At least two lenses may be additionally disposed between at least two of the first lens to the tenth lens 201, 202, 203, 204, 205, 206, 207, 208, 209, 210.

[0157] The first lens 201 may have a negative (minus) diopter. The first lens 201 may have a convex meniscus shape on the object side. The first lens 201 may have an object-side surface S1 formed convexly. The first lens 201 may have an object-side surface S1 formed convexly with respect to the optical axis. The first lens 201 may have a concave upper-side surface S2. The first lens 201 may have an upper-side surface S2 concave with respect to the optical axis. The object-side surface or the upper-side surface of the first lens 201 may include at least one inflection point.

[0158] The radius of curvature of the object-side surface S1 of the first lens 201 may be a positive number. The radius of curvature of the object-side surface S1 of the first lens 201 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S2 of the first lens 201 may be a positive number. The radius of curvature of the upper-side surface S2 of the first lens 201 along the optical axis may be a positive number. The absolute value of the radius of curvature of the object-side surface S1 of the first lens 201 may be greater than the absolute value of the radius of curvature of the upper-side surface S2 of the first lens 201. The first lens 201 may be a solid lens. The two surfaces of the first lens 201 may be formed as aspherical surfaces. One of the two surfaces of the first lens 201 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0159] The first lens 201 may satisfy the range of 1.5 < N1 < 1.6. In addition, the first lens 201 may satisfy the range of 1.52 < N1 < 1.58. N1 is the refractive index of the first lens 201. The first lens 201 may satisfy the range of 50 < V1 < 60. In addition, the first lens 201 may satisfy the range of 52 < V1 < 58. V1 is the Abbe number of the first lens 201.

[0160] The lens unit may include a second lens 202. The second lens 202 may be the second lens arranged starting from the object side. The second lens 202 may be the second lens adjacent to the first lens 201 and starting from the object side. The second lens 202 may be arranged between the first lens 201 and the image side. The second lens 202 may be arranged between the first lens 201 and the third lens 203. An additional lens may be arranged between the second lens 202 and the first lens 201 or between the second lens 202 and the third lens 203.

[0161] The second lens 202 may have a positive (+) refractive power. The second lens 202 may be formed with two convex surfaces. The second lens 202 may have an object-side surface S3 formed convexly. The second lens 202 may have an object-side surface S3 formed convexly with respect to the optical axis. The second lens 202 may have an upper-side surface S4 formed concavely. The second lens 202 may have an upper-side surface S4 formed concavely with respect to the optical axis. The object-side surface S3 or the upper-side surface S4 of the second lens 202 may include at least one inflection point.

[0162] The radius of curvature of the object-side surface S3 of the second lens 202 may be a positive number. The radius of curvature of the object-side surface S3 of the second lens 202 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S4 of the second lens 202 may be a negative number. The radius of curvature of the upper-side surface S4 of the second lens 202 on the optical axis may be a negative number. The absolute value of the radius of curvature of the object-side surface S3 of the second lens 202 may be less than the absolute value of the radius of curvature of the upper-side surface S4 of the second lens 202. The second lens 202 may be a solid lens. The two surfaces of the second lens 202 may be formed as aspherical surfaces. One of the two surfaces of the second lens 202 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0163] The second lens 202 may satisfy the range of 1.5 < N2 < 1.6. In addition, the second lens 202 may satisfy the range of 1.52 < N2 < 1.58. N2 is the refractive index of the second lens 202. The second lens 202 may satisfy the range of 50 < V2 < 60. In addition, the second lens 202 may satisfy the range of 55 < V2 < 58. V2 is the Abbe number of the second lens 202.

[0164] The lens unit may include a third lens 203. The third lens 203 may be the third lens arranged starting from the object side. The third lens 203 may be the third lens adjacent to the object side. The third lens 203 may be arranged between the second lens 202 and the upper side. The third lens 203 may be arranged between the second lens 202 and the fourth lens 204. An additional lens may be arranged between the third lens 203 and the second lens 202 or between the third lens 203 and the fourth lens 204.

[0165] The third lens 203 may have a positive (+) refractive power. The third lens 203 may be formed with two convex surfaces. The third lens 203 may be formed with a convex object-side surface S5. The third lens 203 may be formed with an object-side surface S5 that is convex with respect to the optical axis. The third lens 203 may have an upper-side surface S6 that is convexly formed. The third lens 203 may have an upper-side surface S6 that is convexly formed with respect to the optical axis. The object-side surface or the upper-side surface of the third lens 203 may include at least one inflection point.

[0166] The radius of curvature of the object-side surface S5 of the third lens 203 may be a positive number. The radius of curvature of the object-side surface S5 of the third lens 203 with respect to the optical axis may be a positive number. The radius of curvature of the upper-side surface S6 of the third lens 203 may be a negative number. The radius of curvature of the upper-side surface S6 of the third lens 203 along the optical axis may be a negative number. The absolute value of the radius of curvature of the object-side surface of the third lens 203 may be greater than the absolute value of the radius of curvature of the upper-side surface of the third lens 203. The third lens 203 may be a solid lens. The two surfaces of the third lens 203 may be formed as aspherical surfaces. One of the two surfaces of the third lens 203 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0167] The third lens 203 may satisfy the range of 1.5 < N3 < 1.6. In addition, the third lens 203 may satisfy the range of 1.52 < N3 < 1.58. N3 is the refractive index of the third lens 203. The third lens 203 may satisfy the range of 50 < V3 < 60. In addition, the third lens 203 may satisfy the range of 52 < V3 < 58. V3 is the Abbe number of the third lens 203.

[0168] The lens unit may include a fourth lens 204. The fourth lens 204 may be the fourth lens arranged from the object side. The fourth lens 204 may be the seventh lens arranged from the image side. The fourth lens 204 may be arranged between the third lens 203 and the image side. The fourth lens 204 may be arranged between the third lens 203 and the fifth lens 205. An additional lens may be arranged between the fourth lens 204 and the third lens 203 or between the fourth lens 204 and the fifth lens 205.

[0169] The fourth lens 204 may have a negative (-) refractive power. The fourth lens 204 may have a convex meniscus shape on the object side. The fourth lens 204 may have a convex object-side surface S7. The fourth lens 204 may have an object-side surface S7 that is convex with respect to the optical axis. The fourth lens 204 may have a concave upper-side surface S8. The fourth lens 204 may have an upper-side surface S8 that is concave with respect to the optical axis. The object-side surface or the upper-side surface of the fourth lens 204 may include at least one inflection point.

[0170] The radius of curvature of the object-side surface S7 of the fourth lens 204 may be a positive number. The radius of curvature of the object-side surface S7 of the fourth lens 204 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S8 of the fourth lens 204 may be a positive number. The radius of curvature of the upper-side surface S8 of the fourth lens 204 on the optical axis may be a positive number. The absolute value of the radius of curvature of the object-side surface S7 of the fourth lens 204 may be greater than the absolute value of the radius of curvature of the upper-side surface S8 of the fourth lens 204. The fourth lens 204 may be a solid lens. The two surfaces of the fourth lens 204 may be formed as aspherical surfaces. One of the two surfaces of the fourth lens 204 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0171] The fourth lens 204 may satisfy the range of 1.6 < N4 < 1.7. In addition, the fourth lens 204 may satisfy the range of 1.65 < N4 < 1.7. N4 is the refractive index of the fourth lens 204. The fourth lens 204 may satisfy the range of 15 < V4 < 30. In addition, the fourth lens 204 may satisfy the range of 17 < V4 < 20. V4 is the Abbe number of the fourth lens 204.

[0172] The lens unit may include a fifth lens 205. The fifth lens 205 may be the fifth lens provided from the object side. The fifth lens 205 may be the sixth lens provided from the image side. The fifth lens 205 may be disposed between the fourth lens 204 and the image side. The fifth lens 205 may be disposed between the fourth lens 204 and the sixth lens 206. An additional lens may be disposed between the fifth lens 205 and the fourth lens 204 or between the fifth lens 205 and the sixth lens 206.

[0173] The fifth lens 205 may have a positive (+) diopter. The fifth lens 205 may have a convex shape on both sides. The fifth lens 205 may have an object-side surface S9 formed in a convex manner. The fifth lens 205 may have an object-side surface S9 convexly formed with respect to the optical axis. The fifth lens 205 may have an upper-side surface S10 formed in a convex manner. The fifth lens 205 may have an upper-side surface S10 convexly formed with respect to the optical axis. The object-side surface or the upper-side surface of the fifth lens 205 may include at least one inflection point.

[0174] The radius of curvature of the object-side surface S9 of the fifth lens 205 may be a positive number. The radius of curvature of the object-side surface S9 of the fifth lens 205 with respect to the optical axis may be a positive number. The radius of curvature of the upper-side surface S10 of the fifth lens 205 may be a negative number. The radius of curvature of the upper-side surface S10 of the fifth lens 205 along the optical axis may be a negative number. The absolute value of the radius of curvature of the object-side surface S9 of the fifth lens 205 may be greater than the absolute value of the radius of curvature of the upper-side surface S10 of the fifth lens 205. The fifth lens 205 may be a solid lens. The two surfaces of the fifth lens 205 may be formed as aspherical surfaces. One of the two surfaces of the fifth lens 205 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0175] The fifth lens 205 may satisfy the range of 1.5 < N5 < 1.6. In addition, the fifth lens 205 may satisfy the range of 1.52 < N5 < 1.58. N5 is the refractive index of the fifth lens 205. The fifth lens 205 may satisfy the range of 50 < V5 < 60. In addition, the fifth lens 205 may satisfy the range of 52 < V5 < 58. V5 is the Abbe number of the fifth lens 205.

[0176] The lens unit may include a sixth lens 206. The sixth lens 206 may be the sixth lens arranged from the object side. The sixth lens 206 may be the fifth lens arranged from the image side. The sixth lens 206 may be arranged between the fifth lens 205 and the seventh lens 207. The sixth lens 206 may be arranged between the fifth lens 205 and the image side. An additional lens may be arranged between the sixth lens 206 and the fifth lens 205 or between the sixth lens 206 and the seventh lens 207.

[0177] The sixth lens 206 may have a negative (minus) diopter. The sixth lens 206 may have a convex meniscus shape on the image side. The sixth lens 206 may have an object-side surface S11 formed in a concave manner. The sixth lens 206 may have an object-side surface S11 that is concave with respect to the optical axis. The sixth lens 206 may have a convex upper-side surface S12. The sixth lens 206 may have an upper-side surface S12 that is convex with respect to the optical axis. The object-side surface or the upper-side surface of the sixth lens 206 may include at least one inflection point.

[0178] The radius of curvature of the object-side surface S11 of the sixth lens 206 may be negative. The radius of curvature of the object-side surface S11 of the sixth lens 206 on the optical axis may be negative. The radius of curvature of the upper-side surface S12 of the sixth lens 206 may be negative. The radius of curvature of the upper-side surface S12 of the sixth lens 206 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the sixth lens 206 may be less than the absolute value of the radius of curvature of the upper-side surface of the sixth lens 206. The sixth lens 206 may be a solid lens. The two surfaces of the sixth lens 206 may be formed as aspherical surfaces. One of the two surfaces of the sixth lens 206 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The sixth lens 206 may have a surface including more than one inflection point.

[0179] The sixth lens 206 may satisfy the range of 1.5 < N6 < 1.6. In addition, the sixth lens 206 may satisfy the range of 1.52 < N6 < 1.58. N6 is the refractive index of the sixth lens 206. The sixth lens 206 may satisfy the range of 50 < V6 < 60. In addition, the sixth lens 206 may satisfy the range of 52 < V6 < 58. V6 is the Abbe number of the sixth lens 206.

[0180] The lens unit may include a seventh lens 207. The seventh lens 207 may be the seventh lens arranged from the object side. The seventh lens 207 may be the fourth lens arranged from the image side. The seventh lens 207 may be disposed between the sixth lens 206 and the eighth lens 208. The seventh lens 207 may be disposed between the sixth lens 206 and the image side. An additional lens may be disposed between the seventh lens 207 and the sixth lens 206 or between the seventh lens 207 and the eighth lens 208.

[0181] The seventh lens 207 may have a positive (+) diopter. The seventh lens 207 may have a convex meniscus shape on the image side. The seventh lens 207 may have an object-side surface S13 formed concavely. The seventh lens 207 may have an object-side surface S13 formed concavely with respect to the optical axis. The seventh lens 207 may have an upper-side surface S14 formed convexly. The seventh lens 207 may have an upper-side surface S14 formed convexly with respect to the optical axis. The object-side surface or the upper-side surface of the seventh lens 207 may include at least one inflection point.

[0182] The radius of curvature of the object-side surface S13 of the seventh lens 207 may be negative. The radius of curvature of the object-side surface S13 of the seventh lens 207 on the optical axis may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 207 may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 207 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the seventh lens 207 may be greater than the absolute value of the radius of curvature of the upper-side surface of the seventh lens 207. The seventh lens 207 may be a solid lens. The two surfaces of the seventh lens 207 may be formed as aspherical surfaces. One of the two surfaces of the seventh lens 207 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The seventh lens 207 may have a surface including more than one inflection point.

[0183] The seventh lens 207 may satisfy the range of 1.5 < N7 < 1.6. In addition, the seventh lens 207 may satisfy the range of 1.52 < N7 < 1.58. N7 is the refractive index of the seventh lens 207. The seventh lens 207 may satisfy the range of 50 < V7 < 60. In addition, the seventh lens 207 may satisfy the range of 52 < V7 < 58. V6 is the Abbe number of the seventh lens 207.

[0184] The lens unit may include an eighth lens 208. The eighth lens 208 may be the eighth lens arranged from the object side. The eighth lens 208 may be the third lens arranged from the image side. The eighth lens 208 may be arranged between the seventh lens 207 and the ninth lens 209. The eighth lens 208 may be arranged between the seventh lens 207 and the image side. An additional lens may be arranged between the eighth lens 208 and the seventh lens 207 or between the eighth lens 208 and the ninth lens 209.

[0185] The eighth lens 208 may have a negative (minus) diopter. The eighth lens 208 may have a concave shape on both sides. The eighth lens 208 may have an object-side surface S15 formed in a concave manner. The eighth lens 208 may have an object-side surface S15 formed convex with respect to the optical axis. The eighth lens 208 may have an upper-side surface S16 formed in a concave manner. The eighth lens 208 may have an upper-side surface S16 concave with respect to the optical axis. The object-side surface or the upper-side surface of the eighth lens 208 may include at least one inflection point.

[0186] The radius of curvature of the object-side surface S15 of the eighth lens 208 may be negative. The radius of curvature of the object-side surface S16 of the eighth lens 208 with respect to the optical axis may be negative. The radius of curvature of the upper-side surface S16 of the eighth lens 208 may be positive. The radius of curvature of the upper-side surface S16 of the eighth lens 208 along the optical axis may be positive. The value of the radius of curvature of the object-side surface of the eighth lens 208 may be greater than the value of the radius of curvature of the upper-side surface of the eighth lens 208. The eighth lens 208 may be a solid lens. The two surfaces of the eighth lens 208 may be formed as aspherical surfaces. One of the two surfaces of the eighth lens 208 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The eighth lens 208 may have a surface including more than one inflection point.

[0187] The eighth lens 208 may satisfy the range of 1.6 < N8 < 1.7. In addition, the eighth lens 208 may satisfy the range of 1.65 < N8 < 1.7. N8 is the refractive index of the eighth lens 208. The eighth lens 208 may satisfy the range of 10 < V8 < 25. In addition, the eighth lens 208 may satisfy the range of 15 < V8 < 20. V8 is the Abbe number of the eighth lens 208.

[0188] The lens unit may include a ninth lens 209. The ninth lens 209 may be the ninth lens arranged from the object side. The ninth lens 209 may be the second lens arranged from the image side. The ninth lens 209 may be arranged between the eighth lens 208 and the tenth lens 210. The ninth lens 209 may be arranged between the eighth lens 208 and the image side. An additional lens may be arranged between the ninth lens 209 and the eighth lens 208 or between the ninth lens 209 and the tenth lens 210.

[0189] The ninth lens 209 may have a positive (+) diopter. The ninth lens 209 may have a convex meniscus shape on the object side. The ninth lens 209 may have an object-side surface S17 formed convexly. The ninth lens 209 may have an object-side surface S17 formed convexly with respect to the optical axis. The ninth lens 209 may have an upper-side surface S18 formed concavely. The ninth lens 209 may have an upper-side surface S18 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the ninth lens 209 may include at least one inflection point.

[0190] The radius of curvature of the object-side surface S17 of the ninth lens 209 can be a positive number. The radius of curvature of the object-side surface S17 of the ninth lens 209 with respect to the optical axis can be a positive number. The radius of curvature of the upper-side surface S18 of the ninth lens 209 can be a positive number. The radius of curvature of the upper-side surface S18 of the ninth lens 209 along the optical axis can be a positive number. The value of the radius of curvature of the object-side surface of the ninth lens 209 can be less than the value of the radius of curvature of the upper-side surface of the ninth lens 209. The ninth lens 209 can be a solid lens. The two surfaces of the ninth lens 209 can be formed as aspherical surfaces. One of the two surfaces of the ninth lens 209 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface. The ninth lens 209 can have a surface including more than one inflection point.

[0191] The ninth lens 209 can satisfy the range of 1.6 < N9 < 1.7. In addition, the ninth lens 209 can satisfy the range of 1.65 < N9 < 1.7. N9 is the refractive index of the ninth lens 209. The ninth lens 209 can satisfy the range of 20 < V9 < 30. In addition, the ninth lens 209 can satisfy the range of 22 < V9 < 28. V9 is the Abbe number of the ninth lens 209.

[0192] The lens unit can include a tenth lens 210. The tenth lens 210 can be the lens closest to the image side. The tenth lens 210 can be disposed between the ninth lens 209 and the image side. An additional lens can be disposed between the tenth lens 210 and the ninth lens 209 or between the tenth lens 210 and the filter 900.

[0193] The tenth lens 210 can have a negative (minus) refractive power. The tenth lens 210 can have a convex meniscus shape on the object side. The tenth lens 210 can have an object-side surface S19 formed convexly. The tenth lens 210 can have an object-side surface S19 formed convexly with respect to the optical axis. The tenth lens 210 can have an upper-side surface S20 formed concavely. The tenth lens 210 can have an upper-side surface S20 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the tenth lens 210 can include at least one inflection point.

[0194] The radius of curvature of the object-side surface S19 of the tenth lens 210 may be positive. The radius of curvature of the object-side surface S19 of the tenth lens 210 with respect to the optical axis may be positive. The radius of curvature of the upper-side surface S20 of the tenth lens 210 may be positive. The radius of curvature of the upper-side surface S20 of the tenth lens 210 along the optical axis may be positive. The value of the radius of curvature of the object-side surface of the tenth lens 210 may be greater than the value of the radius of curvature of the upper-side surface of the tenth lens 210. The tenth lens 210 may be a solid lens. The two surfaces of the tenth lens 210 may be formed as aspherical surfaces. One of the two surfaces of the tenth lens 210 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The tenth lens 210 may have a surface including more than one inflection point.

[0195] The tenth lens 210 may satisfy the range of 1.5 < N10 < 1.6. In addition, the tenth lens 210 may satisfy the range of 1.52 < N10 < 1.55. N10 is the refractive index of the tenth lens 210. The tenth lens 210 may satisfy the range of 50 < V10 < 60. In addition, the tenth lens 210 may satisfy the range of 52 < V10 < 58. V10 is the Abbe number of the tenth lens 210.

[0196] The imaging lens may include an aperture STOP. The aperture STOP may be disposed between the first lens 201 and the second lens 202. The aperture STOP may be arranged to be closer to the second lens 202 than to the first lens 201. The aperture STOP may be spaced apart from the object-side surface of the first lens 201. The aperture STOP may adjust the amount of light incident from the subject. The aperture STOP may adjust the amount of light passing through the first lens 201. The aperture STOP may adjust the amount of light entering the second lens 202. The aperture STOP may include an aperture stop.

[0197]

Table 3

[0198]

[0199]

[0200] Table 3 shows the surface number (surface), radius of curvature (radius), center thickness of each lens or distance between lens surfaces (thickness), refractive index (nd), Abbe number (vd), effective radius (semi-aperture), and focal length of the lenses according to the second embodiment of the present invention. Here, the unit of the radius of curvature and the thickness or distance may be mm.

[0201] Figure 6 is a table showing the sagittal height values of the object-side surface and the sensor-side surface of the ninth lens and the tenth lens according to the second embodiment of the present invention.

[0202] The seventeenth surface S17 on the object side and the eighteenth surface S18 on the sensor side of the ninth lens 209 may each have at least one critical point from the optical axis OA to the end of the effective area. The eighteenth surface S18 on the sensor side of the ninth lens 209 may have a critical point at a point where the Y value from the optical axis OA is 0.8 mm to 1.0 mm. If the eighteenth surface S18 on the sensor side of the ninth lens 209 has a critical point, the critical point may be located within a range of 30% to 40% of the effective radius from the optical axis OA.

[0203] The nineteenth surface S19 on the object side and the twentieth surface S20 on the sensor side of the tenth lens 210 may each have at least one critical point from the optical axis OA to the end of the effective area. The nineteenth surface S19 on the object side of the tenth lens 210 may have a critical point at a point where the Y value from the optical axis OA is 3.1 mm to 3.2 mm. Here, Y represents the distance from the optical axis OA in a direction perpendicular to the optical axis. When the nineteenth surface S19 on the object side of the tenth lens 210 has a critical point, the critical point may be located within a range of more than 90% and less than 95% of the effective radius from the optical axis OA. The twentieth surface S20 on the sensor side of the tenth lens 210 may have a critical point at a point where the Y value from the optical axis OA is 1.7 mm to 1.8 mm. If the twentieth surface S20 on the sensor side of the tenth lens 210 has a critical point, the critical point may be located within a range where the distance from the optical axis OA is between 40% and 50% of the effective radius.

[0204]

Table 4

[0205] Second Embodiment TTL 6.06 F 4.67 Fno 2.2 ImgH*2 8.2 FOV 72.8

[0206] Table 4 shows the characteristics of the imaging lens according to the second embodiment of the present invention.

[0207] TTL represents the optical axis distance from the vertex of the object side surface of the first lens 201 to the image surface, F represents the total focal length, Fno represents the ratio of the focal length of the lens to the effective diameter, ImgH represents the distance from the optical axis OA to the diagonal end of the image sensor 800 or half of the maximum diagonal length, and FOV represents the field of view in the diagonal direction of the optical system. Here, the units of TTL, F, and ImgH may be mm, and the unit of FOV may be degrees.

[0208] Now, the configuration of the optical system according to the third embodiment of the present invention will be described with reference to the accompanying drawings.

[0209] Figure 7 is a side cross-sectional view of the optical system according to the third embodiment and a camera module having the optical system.

[0210] The optical system according to the third embodiment may include a lens unit, and the lens unit may include a first lens 301 to a tenth lens 310. The first lens to the tenth lens 301, 302, 303, 304, 305, 306, 307, 308, 309, 310 may be sequentially arranged along the optical axis OA. Light corresponding to the information of the object may pass through the first lens 301 to the tenth lens 310 and the filter 900, and enter the image sensor 800.

[0211] The lens unit may be sequentially arranged from the object side to the image side as the first lens 301, the aperture STOP, the second lens 302, the third lens 303, the fourth lens 304, the fifth lens 305, the sixth lens 306, the seventh lens 307, the eighth lens 308, the ninth lens 309, and the tenth lens 310. The imaging lens according to the third embodiment may be composed of eight or fewer lenses. Alternatively, the imaging lens according to the third embodiment may be composed of nine or more lenses.

[0212] In other embodiments, one or more additional lenses, plates, or optical components may be added between the first lens 301 and the tenth lens 310. In addition, one or more additional lenses, plates, or optical components may be added before the first lens 301 or after the tenth lens 310. In addition, one or more additional lenses, plates, or optical components may be added between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter 900 may be a flat lens. The diopter of the flat lens may be "0". The diopter of the flat lens may be zero. In addition, a filter layer may be provided between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter layer may be coated to serve as a filter.

[0213] The lens unit may include the first lens 301. The first lens 301 may be closest to the object side. The first lens 301 may be the first lens provided on the object side. The first lens 301 may be the first lens adjacent to the object side. An additional lens may be provided between the first lens 301 and the second lens 302.

[0214] Between the first lens 301 and the tenth lens 310, the second lens to the eighth lens 302, 303, 304, 305, 306, 307, 308 may be provided. Between the first lens 301 and the tenth lens 310, additional lenses other than the second lens to the ninth lens 302, 303, 304, 305, 306, 307, 308, 309 may be further provided. At least two lenses may be additionally provided between any two of the first lens to the tenth lens 301, 302, 303, 304, 305, 306, 307, 308, 309, 310.

[0215] The first lens 301 may have a negative (minus) refractive power. The first lens 301 may have a convex meniscus shape on the object side. The first lens 301 may have an object-side surface S1 formed convexly. The first lens 301 may have an object-side surface S1 formed convexly with respect to the optical axis. The first lens 301 may have a concave upper-side surface S2. The first lens 301 may have an upper-side surface S2 concave with respect to the optical axis. The object-side surface or the upper-side surface of the first lens 301 may include at least one inflection point.

[0216] The radius of curvature of the object-side surface S1 of the first lens 301 may be a positive number. The radius of curvature of the object-side surface S1 of the first lens 301 with respect to the optical axis may be a positive number. The radius of curvature of the upper-side surface S2 of the first lens 301 may be a positive number. The radius of curvature of the upper-side surface S2 of the first lens 301 along the optical axis may be a positive number. The absolute value of the radius of curvature of the object-side surface S1 of the first lens 301 may be greater than the absolute value of the radius of curvature of the upper-side surface S2 of the first lens 301. The first lens 301 may be a solid lens. The two surfaces of the first lens 301 may be formed as aspherical surfaces. One of the two surfaces of the first lens 301 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0217] The first lens 301 may satisfy the range of 1.5 < N1 < 1.6. In addition, the first lens 301 may satisfy the range of 1.52 < N1 < 1.58. N1 is the refractive index of the first lens 301. The first lens 301 may satisfy the range of 50 < V1 < 60. In addition, the first lens 301 may satisfy the range of 52 < V1 < 58. V1 is the Abbe number of the first lens 301.

[0218] The lens unit may include a second lens 302. The second lens 302 may be the second lens arranged starting from the object side. The second lens 302 may be the second lens adjacent to the first lens and starting from the object side. The second lens 302 may be disposed between the first lens 301 and the upper side. The second lens 302 may be disposed between the first lens 301 and the third lens 303. An additional lens may be disposed between the second lens 302 and the first lens 301 or between the second lens 302 and the third lens 303.

[0219] The second lens 302 may have a positive (+) refractive power. The second lens 302 may be formed with two convex surfaces. The second lens 302 may have an object-side surface S3 formed convexly. The second lens 302 may have an object-side surface S3 formed convexly with respect to the optical axis. The second lens 302 may have an upper-side surface S4 formed concavely. The second lens 302 may have an upper-side surface S4 formed concavely with respect to the optical axis. At least one inflection point may be included in the object-side surface S3 or the upper-side surface S4 of the second lens 302.

[0220] The radius of curvature of the object-side surface S3 of the second lens 302 may be a positive number. The radius of curvature of the object-side surface S3 of the second lens 302 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S4 of the second lens 302 may be a negative number. The radius of curvature of the upper-side surface S4 of the second lens 302 on the optical axis may be a negative number. The absolute value of the radius of curvature of the object-side surface S3 of the second lens 302 may be less than the absolute value of the radius of curvature of the upper-side surface S4 of the second lens 304. The second lens 302 may be a solid lens. The two surfaces of the second lens 302 may be formed as aspherical surfaces. One of the two surfaces of the second lens 302 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0221] The second lens 302 may satisfy the range of 1.5 < N2 < 1.6. In addition, the second lens 302 may satisfy the range of 1.52 < N2 < 1.58. N2 is the refractive index of the second lens 302. The second lens 302 may satisfy the range of 50 < V2 < 60. In addition, the second lens 302 may satisfy the range of 55 < V2 < 58. V2 is the Abbe number of the second lens 302.

[0222] The lens unit may include a third lens 303. The third lens 303 may be the third lens arranged starting from the object side. The third lens 303 may be the third lens adjacent to the object side. The third lens 303 may be disposed between the second lens 302 and the image side. The third lens 303 may be disposed between the second lens 302 and the fourth lens 304. An additional lens may be disposed between the third lens 303 and the second lens 302 or between the third lens 303 and the fourth lens 304.

[0223] The third lens 303 may have a negative diopter. The third lens 303 may have a convex meniscus shape on the image side. The third lens 303 may have an object-side surface S5 formed recessively. The third lens 303 may have an object-side surface S5 formed recessively with respect to the optical axis. The third lens 303 may have a convex upper surface S6. The third lens 303 may have an upper surface S6 convex with respect to the optical axis. The object-side surface or the upper surface of the third lens 303 may include at least one inflection point.

[0224] The radius of curvature of the object-side surface S5 of the third lens 303 may be negative. The radius of curvature of the object-side surface S5 of the third lens 303 with respect to the optical axis may be negative. The radius of curvature of the upper surface S6 of the third lens 303 may be negative. The radius of curvature of the upper surface S6 of the third lens 303 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the third lens 303 may be less than the absolute value of the radius of curvature of the upper surface of the third lens 302. The third lens 303 may be a solid lens. The two surfaces of the third lens 303 may be formed as aspherical surfaces. One of the two surfaces of the third lens 303 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0225] The third lens 303 may satisfy the range of 1.5 < N3 < 1.6. In addition, the third lens 303 may satisfy the range of 1.52 < N3 < 1.58. N3 is the refractive index of the third lens 303. The third lens 303 may satisfy the range of 50 < V3 < 60. In addition, the third lens 303 may satisfy the range of 52 < V3 < 58. V3 is the Abbe number of the third lens 303.

[0226] The lens unit may include a fourth lens 304. The fourth lens 304 may be the fourth lens arranged from the object side. The fourth lens 304 may be the seventh lens arranged from the image side. The fourth lens 304 may be arranged between the third lens 303 and the image side. The fourth lens 304 may be arranged between the third lens 303 and the fifth lens 305. An additional lens may be arranged between the fourth lens 304 and the third lens 303 or between the fourth lens 304 and the fifth lens 305.

[0227] The fourth lens 304 may have a negative diopter. The fourth lens 304 may have a convex meniscus shape on the object side. The fourth lens 304 may have a convex object-side surface S7. The fourth lens 304 may have an object-side surface S7 convex with respect to the optical axis. The fourth lens 304 may have a concave upper surface S8. The fourth lens 304 may have an upper surface S8 concave with respect to the optical axis. The object-side surface or the upper surface of the fourth lens 304 may include at least one inflection point.

[0228] The radius of curvature of the object-side surface S7 of the fourth lens 304 may be a positive number. The radius of curvature of the object-side surface S7 of the fourth lens 304 with respect to the optical axis may be a positive number. The radius of curvature of the upper-side surface S8 of the fourth lens 304 may be a positive number. The radius of curvature of the upper-side surface S8 of the fourth lens 304 on the optical axis may be a positive number. The absolute value of the radius of curvature of the object-side surface S7 of the fourth lens 304 may be greater than the absolute value of the radius of curvature of the upper-side surface S8 of the fourth lens 306. The fourth lens 304 may be a solid lens. The two surfaces of the fourth lens 304 may be formed as aspherical surfaces. One of the two surfaces of the fourth lens 304 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0229] The fourth lens 304 may satisfy the range of 1.6 < N4 < 1.7. In addition, the fourth lens 304 may satisfy the range of 1.65 < N4 < 1.7. N4 is the refractive index of the fourth lens 304. The fourth lens 304 may satisfy the range of 15 < V4 < 30. In addition, the fourth lens 304 may satisfy the range of 17 < V4 < 20. V4 is the Abbe number of the fourth lens 304.

[0230] The lens unit may include a fifth lens 305. The fifth lens 305 may be the fifth lens provided starting from the object side. The fifth lens 305 may be the sixth lens provided starting from the image side. The fifth lens 305 may be disposed between the fourth lens 304 and the image side. The fifth lens 305 may be disposed between the fourth lens 304 and the sixth lens 306. An additional lens may be disposed between the fifth lens 305 and the fourth lens 304 or between the fifth lens 305 and the sixth lens 306.

[0231] The fifth lens 305 may have a positive (+) diopter. The fifth lens 305 may have a convex meniscus shape on the image side. The fifth lens 305 may have an object-side surface S9 formed recessedly. The fifth lens 305 may have an object-side surface S9 formed recessedly with respect to the optical axis. The fifth lens 305 may have an upper-side surface S10 formed convexly. The fifth lens 305 may have an upper-side surface S10 convex with respect to the optical axis. The object-side surface or the upper-side surface of the fifth lens 305 may include at least one inflection point.

[0232] The radius of curvature of the object-side surface S9 of the fifth lens 305 can be negative. The radius of curvature of the object-side surface S9 of the fifth lens 305 with respect to the optical axis can be negative. The radius of curvature of the upper-side surface S10 of the fifth lens 305 can be negative. The radius of curvature of the upper-side surface S10 of the fifth lens 305 along the optical axis can be negative. The absolute value of the radius of curvature of the object-side surface S9 of the fifth lens 305 can be greater than the absolute value of the radius of curvature of the upper-side surface S10 of the fifth lens 305. The fifth lens 305 can be a solid lens. The two surfaces of the fifth lens 305 can be formed as aspherical surfaces. One of the two surfaces of the fifth lens 305 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface.

[0233] The fifth lens 305 can satisfy the range of 1.5 < N5 < 1.6. In addition, the fifth lens 305 can satisfy the range of 1.52 < N5 < 1.58. N5 is the refractive index of the fifth lens 305. The fifth lens 305 can satisfy the range of 50 < V5 < 60. In addition, the fifth lens 305 can satisfy the range of 52 < V5 < 58. V5 is the Abbe number of the fifth lens 305.

[0234] The lens unit can include a sixth lens 306. The sixth lens 306 can be the sixth lens arranged starting from the object side. The sixth lens 306 can be the fifth lens arranged starting from the image side. The sixth lens 306 can be arranged between the fifth lens 305 and the seventh lens 307. The sixth lens 306 can be arranged between the fifth lens 305 and the image side. An additional lens can be arranged between the sixth lens 306 and the fifth lens 305 or between the sixth lens 306 and the seventh lens 307.

[0235] The sixth lens 306 can have a negative (minus) diopter. The sixth lens 306 can have a convex meniscus shape on the image side. The sixth lens 306 can have an object-side surface S11 formed recessively. The sixth lens 306 can have an object-side surface S11 recessive with respect to the optical axis. The sixth lens 306 can have a convex upper-side surface S12. The sixth lens 306 can have an upper-side surface S12 convex with respect to the optical axis. The object-side surface or the upper-side surface of the sixth lens 306 can include at least one inflection point.

[0236] The radius of curvature of the object-side surface S11 of the sixth lens 306 can be negative. The radius of curvature of the object-side surface S11 of the sixth lens 306 with respect to the optical axis can be negative. The radius of curvature of the upper-side surface S12 of the sixth lens 306 can be negative. The radius of curvature of the upper-side surface S12 of the sixth lens 306 along the optical axis can be negative. The absolute value of the radius of curvature of the object-side surface of the sixth lens 306 can be less than the absolute value of the radius of curvature of the upper-side surface of the sixth lens 306. The sixth lens 306 can be a solid lens.

[0237] The two surfaces of the sixth lens 306 can be formed as aspherical surfaces. One of the two surfaces of the sixth lens 306 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface. The sixth lens 306 can have a surface including more than one inflection point.

[0238] The sixth lens 306 can satisfy the range of 1.5 < N6 < 1.6. In addition, the sixth lens 306 can satisfy the range of 1.52 < N6 < 1.58. N6 is the refractive index of the sixth lens 306. The sixth lens 306 can satisfy the range of 50 < V6 < 60. In addition, the sixth lens 306 can satisfy the range of 52 < V6 < 58. V6 is the Abbe number of the sixth lens 306.

[0239] The lens unit can include a seventh lens 307. The seventh lens 307 can be the seventh lens arranged from the object side. The seventh lens 307 can be the fourth lens arranged from the image side. The seventh lens 307 can be arranged between the sixth lens 306 and the eighth lens 308. The seventh lens 307 can be arranged between the sixth lens 306 and the image side. An additional lens can be arranged between the seventh lens 307 and the sixth lens 306 or between the seventh lens 307 and the eighth lens 308.

[0240] The seventh lens 307 can have a positive (+) diopter. The seventh lens 307 can have a convex meniscus shape on the image side. The seventh lens 307 can have an object-side surface S13 formed concavely. The seventh lens 307 can have an object-side surface S13 formed concavely with respect to the optical axis. The seventh lens 307 can have a convex upper-side surface S14. The seventh lens 307 can have an upper-side surface S14 convex with respect to the optical axis. The object-side surface or the upper-side surface of the seventh lens 307 can include at least one inflection point.

[0241] The radius of curvature of the object-side surface S13 of the seventh lens 307 can be negative. The radius of curvature of the object-side surface S13 of the seventh lens 307 on the optical axis can be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 307 can be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 307 along the optical axis can be negative. The absolute value of the radius of curvature of the object-side surface of the seventh lens 307 can be greater than the absolute value of the radius of curvature of the upper-side surface of the seventh lens 307. The seventh lens 307 can be a solid lens. The two surfaces of the seventh lens 307 can be formed as aspherical surfaces. One of the two surfaces of the seventh lens 307 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface. The seventh lens 307 can have a surface including more than one inflection point.

[0242] The seventh lens 307 may satisfy the range of 1.5 < N7 < 1.6. In addition, the seventh lens 307 may satisfy the range of 1.52 < N7 < 1.58. N7 is the refractive index of the seventh lens 307. The seventh lens 307 may satisfy the range of 50 < V7 < 60. In addition, the seventh lens 307 may satisfy the range of 52 < V7 < 58. V6 is the Abbe number of the seventh lens 307.

[0243] The lens unit may include an eighth lens 308. The eighth lens 308 may be the eighth lens arranged starting from the object side. The eighth lens 308 may be the third lens starting from the image side. The eighth lens 308 may be arranged between the seventh lens 307 and the ninth lens 309. The eighth lens 308 may be arranged between the seventh lens 307 and the image side. An additional lens may be arranged between the eighth lens 308 and the seventh lens 307 or between the eighth lens 308 and the ninth lens 309.

[0244] The eighth lens 308 may have a negative (minus) diopter. The eighth lens 308 may have a concave shape on both sides. The eighth lens 308 may have an object-side surface S15 formed concavely. The eighth lens 308 may have an object-side surface S15 formed convexly with respect to the optical axis. The eighth lens 308 may have an upper-side surface S16 formed concavely. The eighth lens 308 may have an upper-side surface S16 concave with respect to the optical axis. The object-side surface or the upper-side surface of the eighth lens 308 may include at least one inflection point.

[0245] The radius of curvature of the object-side surface S15 of the eighth lens 308 may be negative. The radius of curvature of the object-side surface S16 of the eighth lens 308 on the optical axis may be negative. The radius of curvature of the upper-side surface S16 of the eighth lens 308 may be positive. The radius of curvature of the upper-side surface S16 of the eighth lens 308 along the optical axis may be positive. The value of the radius of curvature of the object-side surface of the eighth lens 308 may be greater than the value of the radius of curvature of the upper-side surface of the eighth lens 308. The eighth lens 308 may be a solid lens. The two surfaces of the eighth lens 308 may be formed as aspherical surfaces. One of the two surfaces of the eighth lens 308 may be formed as a spherical surface and the other surface may be formed as an aspherical surface. The eighth lens 308 may have a surface including more than one inflection point.

[0246] The eighth lens 308 may satisfy the range of 1.6 < N8 < 1.7. In addition, the eighth lens 308 may satisfy the range of 1.65 < N8 < 1.7. N8 is the refractive index of the eighth lens 308. The eighth lens 308 may satisfy the range of 10 < V8 < 25. In addition, the eighth lens 308 may satisfy the range of 15 < V8 < 20. V8 is the Abbe number of the eighth lens 308.

[0247] The lens unit may include a ninth lens 309. The ninth lens 309 may be the ninth lens arranged starting from the object side. The ninth lens 309 may be the second lens arranged starting from the image side. The ninth lens 309 may be arranged between an eighth lens 308 and a tenth lens 310. The ninth lens 309 may be arranged between the eighth lens 308 and the image side. An additional lens may be arranged between the ninth lens 309 and the eighth lens 308 or between the ninth lens 309 and the tenth lens 310.

[0248] The ninth lens 309 may have a positive (+) refractive power. The ninth lens 309 may have a convex meniscus shape on the object side. The ninth lens 309 may have an object-side surface S17 formed convexly. The ninth lens 309 may have an object-side surface S17 formed convexly with respect to the optical axis. The ninth lens 309 may have an upper-side surface S18 formed concavely. The ninth lens 309 may have an upper-side surface S18 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the ninth lens 309 may include at least one inflection point.

[0249] The radius of curvature of the object-side surface S17 of the ninth lens 309 may be a positive number. The radius of curvature of the object-side surface S17 of the ninth lens 309 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S18 of the ninth lens 309 may be a positive number. The radius of curvature of the upper-side surface S18 of the ninth lens 309 on the optical axis may be a positive number. The value of the radius of curvature of the object-side surface of the ninth lens 309 may be less than the value of the radius of curvature of the upper-side surface of the ninth lens 309. The ninth lens 309 may be a solid lens. The two surfaces of the ninth lens 309 may be formed as aspherical surfaces. One of the two surfaces of the ninth lens 309 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The ninth lens 309 may have a surface including more than one inflection point.

[0250] The ninth lens 309 may satisfy the range of 1.6 < N9 < 1.7. In addition, the ninth lens 309 may satisfy the range of 1.65 < N9 < 1.7. N9 is the refractive index of the ninth lens 309. The ninth lens 309 may satisfy the range of 20 < V9 < 30. In addition, the ninth lens 309 may satisfy the range of 22 < V9 < 28. V9 is the Abbe number of the ninth lens 309.

[0251] The lens unit may include a tenth lens 310. The tenth lens 310 may be the lens closest to the upper side. The tenth lens 310 may be arranged between the ninth lens 309 and the image side. An additional lens may be arranged between the tenth lens 310 and the ninth lens 309 or between the tenth lens 310 and a filter 900.

[0252] The tenth lens 310 may have a negative (minus) refractive power. The tenth lens 310 may have a convex meniscus shape on the object side. The tenth lens 310 may have an object-side surface S19 formed convexly. The tenth lens 310 may have an object-side surface S19 formed convexly with respect to the optical axis. The tenth lens 310 may have an upper-side surface S20 formed concavely. The tenth lens 310 may have an upper-side surface S20 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the tenth lens 310 may include at least one inflection point.

[0253] The radius of curvature of the object-side surface S19 of the tenth lens 310 may be positive. The radius of curvature of the object-side surface S19 of the tenth lens 310 on the optical axis may be positive. The radius of curvature of the upper-side surface S20 of the tenth lens 310 may be positive. The radius of curvature of the upper-side surface S20 of the tenth lens 310 along the optical axis may be positive. The value of the radius of curvature of the object-side surface of the tenth lens 310 may be greater than the value of the radius of curvature of the upper-side surface of the tenth lens 310. The tenth lens 310 may be a solid lens. The two surfaces of the tenth lens 310 may be formed as aspherical surfaces. One of the two surfaces of the tenth lens 310 may be formed as a spherical surface and the other surface may be formed as an aspherical surface. The tenth lens 310 may have a surface including more than one inflection point.

[0254] The tenth lens 310 may satisfy the range of 1.5 < N10 < 1.6. In addition, the tenth lens 310 may satisfy the range of 1.52 < N10 < 1.55. N10 is the refractive index of the tenth lens 310. The tenth lens 310 may satisfy the range of 50 < V10 < 60. In addition, the tenth lens 310 may satisfy the range of 52 < V10 < 58. V10 is the Abbe number of the tenth lens 310.

[0255] The imaging lens may include an aperture STOP. The aperture STOP may be disposed between the first lens 301 and the second lens 302. The aperture STOP may be arranged to be closer to the second lens 302 than to the first lens 301. The aperture STOP may be spaced apart from the object-side surface of the first lens 301. The aperture STOP may adjust the amount of light incident from the subject. The aperture STOP may adjust the amount of light passing through the first lens 301. The aperture STOP may adjust the amount of light entering the second lens 302. The aperture STOP may include an aperture diaphragm.

[0256]

Table 5

[0257]

[0258]

[0259]

[0260] Table 5 shows the surface number (surface), radius of curvature (radius), center thickness of each lens or distance between lens surfaces (thickness), refractive index (nd), Abbe number (vd), effective radius (semi-aperture), and focal length of the lens according to the third embodiment of the present invention. Here, the unit of the radius of curvature and the thickness or distance can be mm.

[0261] Figure 9 is a table showing the sagittal height values of the object-side surface and the sensor-side surface of the ninth lens and the tenth lens according to the third embodiment of the present invention.

[0262] The seventeenth surface S17 on the object side and the eighteenth surface S18 on the sensor side of the ninth lens 309 may have at least one critical point from the optical axis OA to the end of the effective region. The eighteenth surface S18 on the sensor side of the ninth lens 309 may have a critical point at a point where the Y value from the optical axis OA is 0.8 mm to 1.0 mm. If the eighteenth surface S18 on the sensor side of the ninth lens 309 has a critical point, the critical point may be located within the range of 30% to 40% of the effective radius from the optical axis OA.

[0263] The nineteenth surface S19 on the object side and the twentieth surface S20 on the sensor side of the tenth lens 310 may have at least one critical point from the optical axis OA to the end of the effective region. The nineteenth surface S19 on the object side of the tenth lens 310 may have a critical point at a point where the Y value along the optical axis OA is 3.1 mm to 3.2 mm. Here, Y represents the distance in the direction perpendicular to the optical axis OA. When the nineteenth surface S19 on the object side of the tenth lens 310 has a critical point, the critical point may be located within the range of more than 90% but not more than 95% of the effective radius from the optical axis OA. The twentieth surface S20 on the sensor side of the tenth lens 310 may have a critical point at a point where the Y value from the optical axis OA is 2 mm to 2.1 mm. If the twentieth surface S20 on the sensor side of the tenth lens 310 has a critical point, the critical point may be located within the range of more than 50% and less than 60% of the distance from the optical axis OA to the effective radius.

[0264]

Table 6

[0265]

[0266]

[0267] Table 6 shows the characteristics of the imaging lens according to the third embodiment of the present invention.

[0268] TTL represents the distance along the optical axis from the vertex of the object-side surface of the first lens 301 to the image surface, F represents the total focal length, Fno represents the ratio of the focal length of the lens to the effective diameter, ImgH represents the distance from the optical axis OA to the diagonal end of the image sensor 800 or half of the maximum diagonal length, and FOV represents the field of view in the diagonal direction of the optical system. Here, the units of TTL, F, and ImgH can be mm, and the unit of FOV can be degrees.

[0269] Now, the configuration of the optical system according to the fourth embodiment of the present invention will be described with reference to the accompanying drawings.

[0270] Figure 10 FIG. is a side cross-sectional view of the optical system according to the fourth embodiment and a camera module having the optical system.

[0271] The optical system according to the fourth embodiment may include a lens unit, and the lens unit may include a first lens 401 to a tenth lens 410. The first lens to the tenth lens 401, 402, 403, 404, 405, 406, 407, 408, 409, 410 may be arranged in sequence along the optical axis OA. Light corresponding to the information of the object may pass through the first lens 401 to the tenth lens 410 and the filter 900, and enter the image sensor 800.

[0272] The lens unit may be arranged in sequence from the object side to the image side as the first lens 401, the second lens 402, the aperture STOP, the third lens 403, the fourth lens 404, the fifth lens 405, the sixth lens 406, the seventh lens 407, the eighth lens 408, the ninth lens 409, and the tenth lens 410. The imaging lens according to the fourth embodiment may be composed of eight or fewer lenses. Alternatively, the imaging lens according to the fourth embodiment may be composed of nine or more lenses.

[0273] In other embodiments, one or more additional lenses, plates, or optical elements may be added between the first lens 401 and the tenth lens 410. In addition, one or more additional lenses, plates, or optical elements may be added before the first lens 401 or after the tenth lens 410. In addition, one or more additional lenses, plates, or optical elements may be added between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter 900 may be a flat lens. The diopter of the flat lens may be "0". The diopter of the flat lens may be zero. In addition, a filter layer may be provided between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter layer may be coated to be used as a filter.

[0274] The lens unit may include a first lens 401. The first lens 401 may be closest to the object side. The first lens 401 may be the first lens disposed on the object side. The first lens 401 may be the first lens adjacent to the object side. An additional lens may be disposed between the first lens 401 and the second lens 402. The second to eighth lenses 402, 403, 404, 405, 406, 407, 408 may be disposed between the first lens 401 and the tenth lens 410. Between the first lens 401 and the tenth lens 410, additional lenses other than the second to ninth lenses 402, 403, 404, 405, 406, 407, 408, 409 may be disposed. At least two lenses may be additionally disposed between any two of the first to tenth lenses 401, 402, 403, 404, 405, 406, 407, 408, 409, 410.

[0275] The first lens 401 may have a negative (-) refractive power. The first lens 401 may have a convex meniscus shape on the object side. The first lens 401 may have an object-side surface S1 formed convexly. The first lens 401 may have an object-side surface S1 formed convexly with respect to the optical axis. The first lens 401 may have an upper-side surface S2 formed concavely. The first lens 401 may have an upper-side surface S2 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the first lens 401 may include at least one inflection point.

[0276] The radius of curvature of the object-side surface S1 of the first lens 401 may be a positive number. The radius of curvature of the object-side surface S1 of the first lens 401 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S2 of the first lens 401 may be a positive number. The radius of curvature of the upper-side surface S2 of the first lens 401 along the optical axis may be a positive number. The absolute value of the radius of curvature of the object-side surface S1 of the first lens 401 may be greater than the absolute value of the radius of curvature of the upper-side surface S2 of the first lens 401. The first lens 401 may be a solid lens. The two surfaces of the first lens 401 may be formed as aspherical surfaces. One of the two surfaces of the first lens 401 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0277] The first lens 401 may satisfy the range of 1.5 < N1 < 1.6. In addition, the first lens 401 may satisfy the range of 1.52 < N1 < 1.58. N1 is the refractive index of the first lens 401. The first lens 401 may satisfy the range of 50 < V1 < 60. In addition, the first lens 401 may satisfy the range of 52 < V1 < 58. V1 is the Abbe number of the first lens 401.

[0278] The lens unit may include a second lens 402. The second lens 402 may be the second lens arranged starting from the object side. The second lens 402 may be the second lens adjacent to the first lens and starting from the object side. The second lens 402 may be arranged between the first lens 401 and the image side. The second lens 402 may be arranged between the first lens 401 and the third lens 403. An additional lens may be arranged between the second lens 402 and the first lens 401 or between the second lens 402 and the third lens 403.

[0279] The second lens 402 may have a positive (+) refractive power. The second lens 402 may be formed with two convex surfaces. The second lens 402 may be formed with a convex object-side surface S3. The second lens 402 may be formed with an object-side surface S3 that is convex with respect to the optical axis. The second lens 402 may have an upper surface S4 formed concavely. The second lens 402 may have an upper surface S4 formed concavely with respect to the optical axis. The object-side surface S3 or the upper surface S4 of the second lens 402 may include at least one inflection point.

[0280] The radius of curvature of the object-side surface S3 of the second lens 402 may be a positive number. The radius of curvature of the object-side surface S3 of the second lens 402 with respect to the optical axis may be a positive number. The radius of curvature of the upper surface S4 of the second lens 402 may be a negative number. The radius of curvature of the upper surface S4 of the second lens 402 on the optical axis may be a negative number. The absolute value of the radius of curvature of the object-side surface S3 of the second lens 402 may be less than the absolute value of the radius of curvature of the upper surface S4 of the second lens 402. The second lens 402 may be a solid lens. The two surfaces of the second lens 402 may be formed as aspherical surfaces. One of the two surfaces of the second lens 402 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0281] The second lens 402 may satisfy the range of 1.5 < N2 < 1.6. In addition, the second lens 402 may satisfy the range of 1.52 < N2 < 1.58. N2 is the refractive index of the second lens 402. The second lens 402 may satisfy the range of 50 < V2 < 60. In addition, the second lens 402 may satisfy the range of 55 < V2 < 58. V2 is the Abbe number of the second lens 402.

[0282] The lens unit may include a third lens 403. The third lens 403 may be the third lens arranged starting from the object side. The third lens 403 may be the third lens adjacent to the object side. The third lens 403 may be arranged between the second lens 402 and the image side. The third lens 403 may be arranged between the second lens 402 and the fourth lens 404. An additional lens may be arranged between the third lens 403 and the second lens 402 or between the third lens 403 and the fourth lens 404.

[0283] The third lens 403 may have a positive (+) refractive power. The third lens 403 may have a convex shape on both sides. The third lens 403 may have an object-side surface S5 formed convexly. The third lens 403 may have an object-side surface S5 formed convexly with respect to the optical axis. The third lens 403 may have an upper-side surface S6 formed convexly. The third lens 403 may have an upper-side surface S6 formed convexly with respect to the optical axis. The object-side surface or the upper-side surface of the third lens 403 may include at least one inflection point.

[0284] The radius of curvature of the object-side surface S5 of the third lens 403 may be a positive number. The radius of curvature of the object-side surface S5 of the third lens 403 with respect to the optical axis may be a positive number. The radius of curvature of the upper-side surface S6 of the third lens 403 may be a negative number. The radius of curvature of the upper-side surface S6 of the third lens 403 along the optical axis may be a negative number. The absolute value of the radius of curvature of the object-side surface of the third lens 403 may be less than the absolute value of the radius of curvature of the upper-side surface of the third lens 403. The third lens 403 may be a solid lens. The two surfaces of the third lens 403 may be formed as aspherical surfaces. One of the two surfaces of the third lens 403 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0285] The third lens 403 may satisfy the range of 1.5 < N3 < 1.6. In addition, the third lens 403 may satisfy the range of 1.52 < N3 < 1.58. N3 is the refractive index of the third lens 403. The third lens 403 may satisfy the range of 50 < V3 < 60. In addition, the third lens 403 may satisfy the range of 52 < V3 < 58. V3 is the Abbe number of the third lens 403.

[0286] The lens unit may include a fourth lens 404. The fourth lens 404 may be the fourth lens provided from the object side. The fourth lens 404 may be the seventh lens provided from the image side. The fourth lens 404 may be disposed between the third lens 403 and the image side. The fourth lens 404 may be disposed between the third lens 403 and the fifth lens 405. An additional lens may be disposed between the fourth lens 404 and the third lens 403 or between the fourth lens 404 and the fifth lens 405.

[0287] The fourth lens 404 may have a negative (-) refractive power. The fourth lens 404 may have a convex meniscus shape on the object side. The fourth lens 404 may have an object-side surface S7 formed convexly. The fourth lens 404 may have an object-side surface S7 formed convexly with respect to the optical axis. The fourth lens 404 may have an upper-side surface S8 formed concavely. The fourth lens 404 may have an upper-side surface S8 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the fourth lens 404 may include at least one inflection point.

[0288] The radius of curvature of the object-side surface S7 of the fourth lens 404 may be a positive number. The radius of curvature of the object-side surface S7 of the fourth lens 404 with respect to the optical axis may be a positive number. The radius of curvature of the upper-side surface S8 of the fourth lens 404 may be a positive number. The radius of curvature of the upper-side surface S8 of the fourth lens 404 on the optical axis may be a positive number. The absolute value of the radius of curvature of the object-side surface S7 of the fourth lens 404 may be greater than the absolute value of the radius of curvature of the upper-side surface S8 of the fourth lens 404. The fourth lens 404 may be a solid lens. The two surfaces of the fourth lens 404 may be formed as aspherical surfaces. One of the two surfaces of the fourth lens 404 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0289] The fourth lens 404 may satisfy the range of 1.6 < N4 < 1.7. In addition, the fourth lens 404 may satisfy the range of 1.65 < N4 < 1.7. N4 is the refractive index of the fourth lens 404. The fourth lens 404 may satisfy the range of 15 < V4 < 30. In addition, the fourth lens 404 may satisfy the range of 17 < V4 < 20. V4 is the Abbe number of the fourth lens 404.

[0290] The lens unit may include a fifth lens 405. The fifth lens 405 may be the fifth lens provided from the object side. The fifth lens 405 may be the sixth lens provided from the image side. The fifth lens 405 may be disposed between the fourth lens 404 and the image side. The fifth lens 405 may be disposed between the fourth lens 404 and the sixth lens 406. An additional lens may be disposed between the fifth lens 405 and the fourth lens 404 or between the fifth lens 405 and the sixth lens 406.

[0291] The fifth lens 405 may have a positive (+) diopter. The fifth lens 405 may have a convex meniscus shape on the image side. The fifth lens 405 may have an object-side surface S9 formed recessedly. The fifth lens 405 may have an object-side surface S9 formed recessedly with respect to the optical axis. The fifth lens 405 may have an upper-side surface S10 formed convexly. The fifth lens 405 may have an upper-side surface S10 convex with respect to the optical axis. The object-side surface or the upper-side surface of the fifth lens 405 may include at least one inflection point.

[0292] The radius of curvature of the object-side surface S9 of the fifth lens 405 may be negative. The radius of curvature of the object-side surface S9 of the fifth lens 405 with respect to the optical axis may be negative. The radius of curvature of the upper-side surface S10 of the fifth lens 405 may be negative. The radius of curvature of the upper-side surface S10 of the fifth lens 405 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface S9 of the fifth lens 405 may be greater than the absolute value of the radius of curvature of the upper-side surface S10 of the fifth lens 405. The fifth lens 405 may be a solid lens. The two surfaces of the fifth lens 405 may be formed as aspherical surfaces. One of the two surfaces of the fifth lens 405 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0293] The fifth lens 405 may satisfy the range of 1.5 < N5 < 1.6. In addition, the fifth lens 405 may satisfy the range of 1.52 < N5 < 1.58. N5 is the refractive index of the fifth lens 405. The fifth lens 405 may satisfy the range of 50 < V5 < 60. In addition, the fifth lens 405 may satisfy the range of 52 < V5 < 58. V5 is the Abbe number of the fifth lens 405.

[0294] The lens unit may include a sixth lens 406. The sixth lens 406 may be the sixth lens arranged from the object side. The sixth lens 406 may be the fifth lens arranged from the image side. The sixth lens 406 may be arranged between the fifth lens 405 and the seventh lens 407. The sixth lens 406 may be arranged between the fifth lens 405 and the image side. An additional lens may be arranged between the sixth lens 406 and the fifth lens 405 or between the sixth lens 406 and the seventh lens 407.

[0295] The sixth lens 406 may have a positive (+) refractive power. The sixth lens 406 may have a convex meniscus shape on the image side. The sixth lens 406 may have an object-side surface S11 formed concavely. The sixth lens 406 may have an object-side surface S11 formed concavely with respect to the optical axis. The sixth lens 406 may have an upper-side surface S12 formed convexly. The sixth lens 406 may have an upper-side surface S12 convex with respect to the optical axis. The object-side surface or the upper-side surface of the sixth lens 406 may include at least one inflection point.

[0296] The radius of curvature of the object-side surface S11 of the sixth lens 406 may be negative. The radius of curvature of the object-side surface S11 of the sixth lens 406 with respect to the optical axis may be negative. The radius of curvature of the upper-side surface S12 of the sixth lens 406 may be negative. The radius of curvature of the upper-side surface S12 of the sixth lens 406 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the sixth lens 406 may be greater than the absolute value of the radius of curvature of the upper-side surface of the sixth lens 406. The sixth lens 406 may be a solid lens. The two surfaces of the sixth lens 406 may be formed as aspherical surfaces. One of the two surfaces of the sixth lens 406 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The sixth lens 406 may have a surface including more than one inflection point.

[0297] The sixth lens 406 may satisfy the range of 1.5 < N6 < 1.6. In addition, the sixth lens 406 may satisfy the range of 1.52 < N6 < 1.58. N6 is the refractive index of the sixth lens 406. The sixth lens 406 may satisfy the range of 50 < V6 < 60. In addition, the sixth lens 406 may satisfy the range of 52 < V6 < 58. V6 is the Abbe number of the sixth lens 406.

[0298] The lens unit may include a seventh lens 407. The seventh lens 407 may be the seventh lens provided from the object side. The seventh lens 407 may be the fourth lens provided from the image side. The seventh lens 407 may be disposed between the sixth lens 406 and the eighth lens 408. The seventh lens 407 may be disposed between the sixth lens 406 and the image side. An additional lens may be disposed between the seventh lens 407 and the sixth lens 406 or between the seventh lens 407 and the eighth lens 408.

[0299] The seventh lens 407 may have a positive (+) diopter. The seventh lens 407 may have a convex meniscus shape on the image side. The seventh lens 407 may have an object-side surface S13 formed recessedly. The seventh lens 407 may have an object-side surface S13 formed recessedly with respect to the optical axis. The seventh lens 407 may have an upper-side surface S14 formed convexly. The seventh lens 407 may have an upper-side surface S14 convex with respect to the optical axis. The object-side surface or the upper-side surface of the seventh lens 407 may include at least one inflection point.

[0300] The radius of curvature of the object-side surface S13 of the seventh lens 407 may be negative. The radius of curvature of the object-side surface S13 of the seventh lens 407 with respect to the optical axis may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 407 may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 407 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the seventh lens 407 may be greater than the absolute value of the radius of curvature of the upper-side surface of the seventh lens 407. The seventh lens 407 may be a solid lens. The two surfaces of the seventh lens 407 may be formed as aspherical surfaces. One of the two surfaces of the seventh lens 407 may be formed as a spherical surface and the other surface may be formed as an aspherical surface. The seventh lens 407 may have a surface including more than one inflection point.

[0301] The seventh lens 407 may satisfy the range of 1.5 < N7 < 1.6. In addition, the seventh lens 407 may satisfy the range of 1.52 < N7 < 1.58. N7 is the refractive index of the seventh lens 407. The seventh lens 407 may satisfy the range of 50 < V7 < 60. In addition, the seventh lens 407 may satisfy the range of 52 < V7 < 58. V6 is the Abbe number of the seventh lens 407.

[0302] The lens unit may include an eighth lens 408. The eighth lens 408 may be the eighth lens arranged from the object side. The eighth lens 408 may be the third lens arranged from the image side. The eighth lens 408 may be arranged between the seventh lens 407 and the ninth lens 409. The eighth lens 408 may be arranged between the seventh lens 407 and the image side. An additional lens may be arranged between the eighth lens 408 and the seventh lens 407 or between the eighth lens 408 and the ninth lens 409.

[0303] The eighth lens 408 may have a negative (minus) diopter. The eighth lens 408 may have a concave shape on both sides. The eighth lens 408 may have an object-side surface S15 formed concave. The eighth lens 408 may have an object-side surface S15 formed convex with respect to the optical axis. The eighth lens 408 may have an upper-side surface S16 formed concave. The eighth lens 408 may have an upper-side surface S16 concave with respect to the optical axis. The object-side surface or the upper-side surface of the eighth lens 408 may include at least one inflection point.

[0304] The radius of curvature of the object-side surface S15 of the eighth lens 408 may be negative. The radius of curvature of the object-side surface S16 of the eighth lens 408 with respect to the optical axis may be negative. The radius of curvature of the upper-side surface S16 of the eighth lens 408 may be positive. The radius of curvature of the upper-side surface S16 of the eighth lens 408 along the optical axis may be positive. The value of the radius of curvature of the object-side surface of the eighth lens 408 may be greater than the value of the radius of curvature of the upper-side surface of the eighth lens 408. The eighth lens 408 may be a solid lens. The two surfaces of the eighth lens 408 may be formed as aspherical surfaces. One of the two surfaces of the eighth lens 408 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The eighth lens 408 may have a surface including more than one inflection point.

[0305] The eighth lens 408 may satisfy the range of 1.6 < N8 < 1.7. In addition, the eighth lens 408 may satisfy the range of 1.65 < N8 < 1.7. N8 is the refractive index of the eighth lens 408. The eighth lens 408 may satisfy the range of 10 < V8 < 25. In addition, the eighth lens 408 may satisfy the range of 15 < V8 < 20. V8 is the Abbe number of the eighth lens 408.

[0306] The lens unit may include a ninth lens 409. The ninth lens 409 may be the ninth lens arranged starting from the object side. The ninth lens 409 may be the second lens arranged starting from the image side. The ninth lens 409 may be arranged between the eighth lens 408 and the tenth lens 410. The ninth lens 409 may be arranged between the eighth lens 408 and the image side. An additional lens may be arranged between the ninth lens 409 and the eighth lens 408 or between the ninth lens 409 and the tenth lens 410.

[0307] The ninth lens 409 may have a positive (+) diopter. The ninth lens 409 may have a convex meniscus shape on the object side. The ninth lens 409 may have an object-side surface S17 formed convexly. The ninth lens 409 may have an object-side surface S17 formed convexly with respect to the optical axis. The ninth lens 409 may have an upper-side surface S18 formed concavely. The ninth lens 409 may have an upper-side surface S18 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the ninth lens 409 may include at least one inflection point.

[0308] The radius of curvature of the object-side surface S17 of the ninth lens 409 can be a positive number. The radius of curvature of the object-side surface S17 of the ninth lens 409 with respect to the optical axis can be a positive number. The radius of curvature of the upper-side surface S18 of the ninth lens 409 can be a positive number. The radius of curvature of the upper-side surface S18 of the ninth lens 409 along the optical axis can be a positive number. The value of the radius of curvature of the object-side surface of the ninth lens 409 can be less than the value of the radius of curvature of the upper-side surface of the ninth lens 409. The ninth lens 409 can be a solid lens. The two surfaces of the ninth lens 409 can be formed as aspherical surfaces. One of the two surfaces of the ninth lens 409 can be formed as a spherical surface and the other surface can be formed as an aspherical surface. The ninth lens 409 can have a surface including more than one inflection point.

[0309] The ninth lens 409 can satisfy the range of 1.6 < N9 < 1.7. In addition, the ninth lens 409 can satisfy the range of 1.65 < N9 < 1.7. N9 is the refractive index of the ninth lens 409. The ninth lens 409 can satisfy the range of 20 < V9 < 30. In addition, the ninth lens 409 can satisfy the range of 22 < V9 < 28. V9 is the Abbe number of the ninth lens 409.

[0310] The lens unit can include a tenth lens 410. The tenth lens 410 can be the lens closest to the image side. The tenth lens 410 can be disposed between the ninth lens 409 and the image side. An additional lens can be disposed between the tenth lens 410 and the ninth lens 409 or between the tenth lens 410 and the filter 900.

[0311] The tenth lens 410 can have a negative (minus) diopter. The tenth lens 410 can have a convex meniscus shape on the object side. The tenth lens 410 can have a convexly formed object-side surface S19. The tenth lens 410 can have an object-side surface S19 convexly formed with respect to the optical axis. The tenth lens 410 can have a concavely formed upper-side surface S20. The tenth lens 410 can have an upper-side surface S20 concavely formed with respect to the optical axis. The object-side surface or the upper-side surface of the tenth lens 410 can include at least one inflection point.

[0312] The radius of curvature of the object-side surface S19 of the tenth lens 410 may be a positive number. The radius of curvature of the object-side surface S19 of the tenth lens 410 with respect to the optical axis may be a positive number. The radius of curvature of the upper-side surface S20 of the tenth lens 410 may be a positive number. The radius of curvature of the upper-side surface S20 of the tenth lens 410 along the optical axis may be a positive number. The value of the radius of curvature of the object-side surface of the tenth lens 410 may be greater than the value of the radius of curvature of the upper-side surface of the tenth lens 410. The tenth lens 410 may be a solid lens. The two surfaces of the tenth lens 410 may be formed as aspherical surfaces. One of the two surfaces of the tenth lens 410 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The tenth lens 410 may have a surface including more than one inflection point.

[0313] The tenth lens 410 may satisfy the range of 1.5 < N10 < 1.6. In addition, the tenth lens 410 may satisfy the range of 1.52 < N10 < 1.55. N10 is the refractive index of the tenth lens 410. The tenth lens 410 may satisfy the range of 50 < V10 < 60. In addition, the tenth lens 410 may satisfy the range of 52 < V10 < 58. V10 is the Abbe number of the tenth lens 410.

[0314] The imaging lens may include an aperture STOP. The aperture STOP may be disposed between the first lens 401 and the second lens 402. The aperture STOP may be set to be closer to the second lens 402 relative to the first lens 401. The aperture STOP may be spaced apart from the object-side surface of the first lens 401. The aperture STOP may adjust the amount of light entering from the subject. The aperture STOP may adjust the amount of light passing through the first lens 401. The aperture STOP may adjust the amount of light entering the second lens 402. The aperture STOP may include an aperture diaphragm.

[0315]

Table 7

[0316]

[0317]

[0318] Table 7 shows the surface number (surface), radius of curvature (radius), center thickness of each lens or distance between lens surfaces (thickness), refractive index (nd), Abbe number (vd), effective radius (semi-aperture), and focal length of the lens according to the fourth embodiment of the present invention. Here, the unit of the radius of curvature and the thickness or distance may be mm.

[0319] Figure 12 is a table showing the sag values of the object-side surface and the sensor-side surface of the ninth lens and the tenth lens according to the fourth embodiment of the present invention.

[0320] The seventeenth surface S17 on the object side and the eighteenth surface S18 on the sensor side of the ninth lens 409 may each have at least one critical point from the optical axis OA to the end of the effective area. The eighteenth surface S18 on the sensor side of the ninth lens 409 may have a critical point at a point where the Y value from the optical axis OA is from 0.8 mm to 1.0 mm. If the eighteenth surface S18 on the sensor side of the ninth lens 409 has a critical point, the critical point may be located within a range of 30% to 40% of the effective radius from the optical axis OA.

[0321] The nineteenth surface S19 on the object side and the twentieth surface S20 on the sensor side of the tenth lens 410 may each have at least one critical point along the optical axis OA to the end of the effective area. The twentieth surface S20 on the sensor side of the tenth lens 410 may have a critical point at a point where the Y value from the optical axis OA is from 1.6 mm to 1.7 mm. If the twentieth surface S20 on the sensor side of the tenth lens 410 has a critical point, the critical point may be located within a range more than 40% and less than 50% of the effective radius from the optical axis OA.

[0322]

Table 8

[0323] Fourth Embodiment TTL 6.08 F 4.77 Fno 2.2 ImgH*2 8.2 FOV 73.6524

[0324] Table 8 shows the characteristics of the imaging lens according to the fourth embodiment of the present invention.

[0325] TTL represents the optical axis distance from the vertex of the object side surface of the first lens 401 to the image surface, F represents the total focal length, Fno represents the ratio of the focal length of the lens to the effective aperture, ImgH represents the distance from the optical axis OA to the diagonal end of the image sensor 800 or half of the maximum diagonal length, and FOV represents the field of view in the diagonal direction of the optical system. Here, the units of TTL, F, and ImgH may be mm, and the unit of FOV may be degrees.

[0326] The optical systems according to the first to fourth embodiments disclosed above may satisfy at least one or more of the following mathematical equations. Therefore, the optical systems according to the first to fourth embodiments may have improved optical characteristics. For example, if the optical system according to the present embodiment satisfies at least one of the mathematical equations, the optical system may effectively control aberration characteristics such as chromatic aberration and distortion aberration, and may have good optical performance not only in the central part but also in the peripheral part of the field of view (FOV). In addition, the optical systems according to the first to fourth embodiments may have improved resolution. In addition, the thickness of the lens described in the mathematical equation on the optical axis OA and the interval (spacing) between adjacent lenses on the optical axis OA may refer to the embodiments disclosed above.

[0327] [Mathematical Equation 1]

[0328] 0.5 < TTL / ImgH * 2 < 0.9

[0329] Mathematical equation 1 can be used to set the total optical axis length (TTL) of the optical system and the length (ImgH) in the diagonal direction starting from the optical axis of the image sensor 800. If the optical system according to the first to fourth embodiments satisfies Mathematical equation 1, the optical system can have a TTL suitable for the image sensor 800, thereby providing improved image quality. In addition, the ultra-thin characteristics of the camera lens group can be effectively realized. In the first to fourth embodiments, Mathematical equation 1 preferably satisfies 0.7 < TTL / ImgH < 0.8.

[0330] [Mathematical equation 2]

[0331] Fno < 2.4

[0332] Mathematical equation 2 can be used to set the range of Fno. When the optical system according to the first to fourth embodiments satisfies Mathematical equation 2, the optical system can provide a bright image and effectively ensure the characteristics of a large aperture to highlight the subject. In the first to fourth embodiments, Mathematical equation 2 preferably satisfies 2 < Fno < 2.3.

[0333] [Mathematical equation 3]

[0334] N1 < 1.6

[0335] Mathematical equation 3 can be used to set the refractive index of the first lenses 101, 201, 301, 401. When the optical system according to the first to fourth embodiments satisfies Mathematical equation 3, setting the refractive index of the first lens to a higher value can control the factors affecting the reduction of the third-order aberration (Zeiss aberration) in the optical system, and can reduce the aberration that may occur as the TTL increases. In the first to fourth embodiments, Mathematical equation 3 preferably satisfies 1.52 < N1 < 1.57.

[0336] [Mathematical equation 4]

[0337] 0 < |F10 / F1| < 0.5

[0338] Mathematical equation 4 can establish the relationship between the focal lengths of the first lenses 101, 201, 301, 401 and the tenth lenses 110, 210, 310, 410 in the optical system. When the optical systems according to the first to fourth embodiments satisfy Mathematical equation 4, the diopters of the first lens and the tenth lens of the optical system can be controlled to improve the resolution and affect the TTL and the effective focal length (EFL). In the first to fourth embodiments, Mathematical equation 4 preferably satisfies 0 < |F10 / F1| < 0.2.

[0339] [Mathematical equation 5]

[0340] 5 < TTL < 6.5

[0341] Mathematical equation 5 can set the range of the TTL, which is the distance from the center of the first surface S1 of the first lenses 101, 201, 301, 401 to the optical axis OA of the image sensor 800. Mathematical equation 5 can be capable of providing a compact mobile optical system. In the first to fourth embodiments, Mathematical equation 5 preferably satisfies the condition 6 < TTL < 6.2.

[0342] [Mathematical equation 6]

[0343] FOV > 65

[0344] Mathematical equation 6 can set the range of the field of view (FOV) in the diagonal direction of the optical system. Mathematical equation 6 in the first to fourth embodiments preferably satisfies 70 ≤ FOV < 75.

[0345] [Mathematical equation 7]

[0346] 0 < CT1 / CT2 < 1

[0347] In Mathematical equation 7, CT1 represents the thickness of the first lenses 101, 201, 301, 401 on the optical axis OA, and CT2 represents the thickness of the second lenses 102, 202, 302, 401 on the optical axis OA (mm). Mathematical equation 7 can establish the relationship between the central thicknesses of the first lens and the second lens, and can improve the chromatic aberration in the optical system. In addition, it can set the central thickness of the first aspherical lenses 101, 201, 301, 401, thereby enhancing the optical performance of the central region and the peripheral region of the field of view (FOV). In the first to fourth embodiments, Mathematical equation 7 satisfies the condition 0.5 < CT1 / CT2 < 1.

[0348] [Mathematical equation 8]

[0349] 1 < TTL / F < 2

[0350] Mathematical equation 8 can set the total focal length (F) and the total optical axis length (TTL) of the optical system. Therefore, a movable optical system can be provided. In the first to fourth embodiments, mathematical equation 8 preferably satisfies the condition 1 < TTL / F < 1.5. When the optical system according to the first to fourth embodiments satisfies mathematical equation 8, the optical system can have an appropriate focal length within the set TTL range. If the value is below the lower limit of mathematical equation 8, it is necessary to increase the diopter of the lens, which makes it difficult to correct spherical aberration or distortion aberration. If the value exceeds the upper limit of mathematical equation 8, the effective length of the lens or the TTL may become longer, resulting in larger problems in the imaging lens system.

[0351] [Mathematical equation 9]

[0352] 4 < L10R1 / CT10 < 8

[0353] In mathematical equation 9, the radius of curvature of the object-side surface S19 of the tenth lens 110, 210, 310, 410 and the center thickness of the tenth lens 110, 210, 310, 410 can be set, and the diopter of the tenth lens 110, 210, 310, 410 can be controlled. Therefore, good optical performance can be achieved in both the central region and the peripheral region of the field of view. Preferably, in the first to fourth embodiments, mathematical equation 9 can satisfy the conditional expression: 5 < L10R1 / CT10 < 6.5. By adjusting the radius of curvature and the center thickness of the tenth lens 110, 210, 310, 410 having an aspherical surface according to mathematical equation 9, the TTL of the optical system can be reduced, and deterioration of optical performance can be prevented.

[0354] [Mathematical equation 10]

[0355] 1 < F / |L1R1| < 2

[0356] In mathematical equation 10, the effective focal length of the optical system and the radius of curvature of the object-side surface S1 of the first lens 101, 201, 301, 401 are set to control the influence on incident light and TTL. In the first to fourth embodiments, mathematical equation 10 preferably satisfies the condition 1.5 < F / |L1R1| < 1.9.

[0357] [Mathematical equation 11]

[0358] 1 < F / ImgH < 2

[0359] Mathematical equation 11 can set the total effective focal length (F) of the optical system and the length (ImgH) in the diagonal direction starting from the optical axis of the image sensor 800. Such an optical system can exhibit improved aberration characteristics in terms of the size of the moving image sensor 800. In the first to fourth embodiments, mathematical equation 11 preferably satisfies 1 < F / ImgH < 1.5.

[0360] [Mathematical equation 12]

[0361] 30 < FOV / Fno < 40

[0362] Mathematical equation 12 can establish the relationship between the diagonal field of view and the Fno of the optical system. In the first to fourth embodiments, mathematical equation 12 preferably satisfies 32 < FOV / Fno < 35. Here, Fno can be provided as 2.3 or less to provide a bright image.

[0363] [Mathematical equation 13]

[0364] 1 < CT9 / CT10 < 2

[0365] In mathematical equation 13, CT9 represents the thickness of the ninth lenses 109, 209, 309, 409 on the optical axis OA, and CT10 represents the thickness of the tenth lenses 110, 210, 310, 410 on the optical axis OA. Mathematical equation 13 can establish the relationship between the center thicknesses of the ninth and tenth lenses, and can control the factors affecting aberration. In the first to fourth embodiments, mathematical equation 13 preferably satisfies the conditional expression: 1 < CT9 / CT10 < 1.5.

[0366] [Mathematical equation 14]

[0367] 1 < ∑CT / ∑CG < 2.5

[0368] In mathematical equation 14, ∑CT is the sum of the center thicknesses of the lenses, and ∑CG is the sum of the intervals between adjacent lenses. When mathematical equation 14 is satisfied, the optical system can achieve good optical performance at the focal length in the specified field of view and reduce the size of the TTL. Preferably, the first, second, and fourth embodiments satisfy 1.5 < ∑CT / ∑CG < 2, and the third embodiment satisfies 1.8 < ∑CT / ∑CG < 2.3.

[0369] [Mathematical equation 15]

[0370] 0.3 < CA_L2 / ImgH < 0.8

[0371] In the mathematical equation 15, CA_L2 is the effective focal length of the second lenses 102, 202, 302, 402, and ImgH is the length (ImgH) in the diagonal direction starting from the optical axis of the image sensor 800. When the mathematical equation 15 is satisfied, the optical path entering the optical system can be controlled, and good optical performance can be achieved at the set field of view and focal length. Preferably, the first to fourth embodiments can satisfy 0.4 < CA_L2 / ImgH < 0.8.

[0372] [Mathematical equation 16]

[0373] 0.2 < CA_L1 / CA_L10 < 0.4

[0374] In the mathematical equation 16, CA_L1 is the effective aperture size of the first lenses 101, 201, 301, 401, and CA_L10 is the effective aperture size of the tenth lenses 110, 210, 310, 410. When the mathematical equation 16 is satisfied, the optical paths of the light entering the optical system and the light leaving the image sensor can be controlled, and the optical system can achieve good optical performance at the set field of view and focal length. Preferably, the first to fourth embodiments can satisfy 0.3 < CA_L1 / CA_L10 < 0.4.

[0375] [Mathematical equation 17]

[0376] 0.2 < CA_L2 / CA_L10 < 0.4

[0377] In the mathematical equation 17, CA_L2 is the effective aperture size of the second lenses 102, 202, 302, 402, and CA_L10 is the effective aperture size of the tenth lenses 110, 210, 310, 410. When the mathematical equation 17 is satisfied, the optical paths of the light entering the optical system and the light leaving the image sensor can be controlled, and the optical system can achieve good optical performance at the set field of view and focal length. Preferably, the first to fourth embodiments can satisfy 0.25 < CA_L2 / CA_L10 < 0.35.

[0378] [Mathematical equation 18]

[0379] 1.2 < CA_L1 / CA_L2 < 1.5

[0380] In mathematical equation 18, CA_L1 is the effective aperture size of the first lenses 101, 201, 301, 401, and CA_L2 is the effective aperture size of the second lenses 102, 202, 302, 402. When mathematical equation 18 is satisfied, the optical paths of the light entering the optical system and the light leaving the image sensor can be controlled, and the optical system can achieve good optical performance at a set field of view and focal length. Preferably, the first to fourth embodiments can satisfy the conditional expression 1.2 < CA_L1 / CA_L2 < 1.35.

[0381] [Mathematical equation 19]

[0382] 30% < CP_L9S18 < 40%

[0383] In mathematical equation 19, CP_L9S18 is the point where the critical point of the eighteenth surface S18 on the sensor side of the ninth lenses 109, 209, 309, 409 is within the effective radius. When mathematical equation 19 is satisfied, various aberrations occurring in the optical system can be corrected. Preferably, the first to fourth embodiments can satisfy the condition 30% < CP_L9S18 < 38%.

[0384] [Mathematical equation 20]

[0385] 40% < CP_L10S20 < 50%

[0386] In mathematical equation 20, CP2_L10S20 is the point where the critical point of the twentieth surface S20 on the object side of the tenth lenses 110, 210, 310, 410 is within the effective radius. When mathematical equation 20 is satisfied, various aberrations occurring in the optical system can be corrected. Preferably, the first to fourth embodiments can satisfy 40% < CP_L10S20 < 48%.

[0387] [Mathematical equation 21]

[0388]

[0389] In mathematical equation 21, Z, as the sag, can represent the distance in the optical axis direction from an arbitrary position on the aspherical surface to the vertex of the aspherical surface. Y can represent the distance in the direction perpendicular to the optical axis from an arbitrary point on the aspherical surface to the optical axis. c can represent the curvature of the lens, and K can represent the conic constant. In addition, A, B, C, D, E, and F can represent the aspherical constants.

[0390] Table 9 shows the results of the above mathematical equations 1 to 20 in the optical system of the embodiment. Referring to Table 9, it can be seen that the optical system satisfies at least one, two or more, or three or more of the mathematical equations 1 to 20. Specifically, the optical system according to the embodiment satisfies all of the mathematical equations 1 to 20. Therefore, the optical system can achieve good optical performance in both the central region and the peripheral region of the field of view (FOV), and exhibits excellent optical characteristics.

[0391] [Table 9]

[0392]

[0393]

[0394] As described above, the camera modules according to the first to fourth embodiments of the present invention have been described with reference to Figures 1 to 12 Hereinafter, the camera modules according to the fifth to seventh embodiments of the present invention will be described with reference to Figures 13 to 30 The detailed description of the camera modules according to the fifth to seventh embodiments of the present invention is based on the detailed description of the camera modules according to the first to fourth embodiments of the present invention, and the names, terms, and functions between the embodiments may be the same or different.

[0395] The configuration of the optical system according to the fifth embodiment of the present invention will be described below with reference to the drawings.

[0396] Figure 13 is a side cross-sectional view of the optical system according to the fifth embodiment and a camera module having the optical system, Figure 14 is a table showing the aspherical coefficient and conic constant (k) values of each lens surface in the optical system according to the fifth embodiment, Figure 15 is a table showing the thickness of each lens and the spacing between adjacent lenses in the optical system according to the fifth embodiment, Figure 16 is a table showing the sagittal height values of each lens surface in the optical system according to the fifth embodiment, Figure 17 is a graph showing the aberration characteristics data of the optical system according to the fifth embodiment, Figure 18 is a graph showing the diffraction MTF (modulation transfer function) data of the optical system according to the fifth embodiment.

[0397] The optical system according to the fifth embodiment may include a lens unit, and the lens unit may include a first lens 501 to a ninth lens 509. The first lens to the ninth lens 501, 502, 503, 504, 505, 506, 507, 508, 509 may be sequentially arranged along the optical axis OA. Light corresponding to information of an object may pass through the first lens 501 to the ninth lens 509 and the filter 900, and enter the image sensor 800.

[0398] The lens unit may be sequentially arranged from the object side to the image side as the first lens 501, the second lens 502, the third lens 503, the aperture STOP, the fourth lens 504, the fifth lens 505, the sixth lens 506, the seventh lens 507, the eighth lens 508, and the ninth lens 509.

[0399] In another embodiment, one or more additional lenses, plates, or optical members may be added between the first lens 501 and the ninth lens 509. In addition, one or more additional lenses, plates, or optical members may be added before the first lens 501 or after the ninth lens 509. In addition, one or more additional lenses, plates, or optical members may be added between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter 900 may be a flat lens. The diopter of the flat lens may be "0". The diopter of the flat lens may be zero. In addition, a filter layer may be provided between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter layer may be coated to be used as a filter.

[0400] The lens unit may include the first lens 501. The first lens 501 may be closest to the object side. The first lens 501 may be the first lens disposed on the object side. The first lens 501 may be the first lens adjacent to the object side. An additional lens may be provided between the first lens 501 and the second lens 502. The second lens to the eighth lens 502, 503, 504, 505, 506, 507, 508 may be provided between the first lens 501 and the ninth lens 509. Between the first lens 501 and the ninth lens 509, additional lenses other than the second lens to the eighth lens 502, 503, 504, 505, 506, 507, 508 may be provided. At least two lenses may be additionally provided between at least two of the first lens to the ninth lens 501, 502, 503, 504, 505, 506, 507, 508, 509.

[0401] The first lens 501 may have a negative (minus) refractive power. The first lens 501 may have a convex meniscus shape on the object side. The first lens 501 may be formed to be convex on the object-side surface S1. The first lens 501 may have an object-side surface S1 formed to be convex with respect to the optical axis. The first lens 501 may have an upper-side surface S2 formed to be concave. The first lens 501 may have an upper-side surface S2 formed to be concave with respect to the optical axis. The first surface S1 of the first lens 501 may be set such that there is no critical point from the optical axis OA to the end of the effective area. The second surface S2 may be set such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0402] The radius of curvature of the object-side surface S1 of the first lens 501 may be positive. The radius of curvature of the object-side surface S1 of the first lens 501 on the optical axis may be positive. The radius of curvature of the upper-side surface S2 of the first lens 501 may be positive. The radius of curvature of the upper-side surface S2 of the first lens 501 along the optical axis may be positive. The absolute value of the radius of curvature of the object-side surface S1 of the first lens 501 may be greater than the absolute value of the radius of curvature of the upper-side surface S2 of the first lens 501. The first lens 501 may be a solid lens. The two surfaces of the first lens 501 may be formed as aspherical surfaces. One of the two surfaces of the first lens 501 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0403] The first lens 501 may satisfy the range of 1.5 < N1 < 1.6. Additionally, the first lens 501 may satisfy the range of 1.52 < N1 < 1.58. N1 is the refractive index of the first lens 501. The first lens 501 may satisfy the range of 50 < V1 < 60. Additionally, the first lens 501 may satisfy the range of 52 < V1 < 58. V1 is the Abbe number of the first lens 501.

[0404] The lens unit may include a second lens 502. The second lens 502 may be the second lens arranged starting from the object side. The second lens 502 may be the second lens adjacent to the object side. The second lens 502 may be arranged between the first lens 501 and the image side. The second lens 502 may be arranged between the first lens 501 and the third lens 503. An additional lens may be arranged between the second lens 502 and the first lens 501 or between the second lens 502 and the third lens 503.

[0405] The second lens 502 may have a negative (minus) refractive power. The second lens 502 may have a convex meniscus shape on the object side. The second lens 502 may have a convex object-side surface S3. The second lens 502 may have an object-side surface S3 that is convex with respect to the optical axis. The second lens 502 may have a concave upper-side surface S4. The second lens 502 may have an upper-side surface S4 that is formed concave with respect to the optical axis. The third surface S3 of the second lens 502 may be arranged such that there are no critical points from the optical axis OA to the end of the effective area. The fourth surface S4 may be arranged such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0406] The radius of curvature of the object-side surface S3 of the second lens 502 may be positive. The radius of curvature of the object-side surface S3 of the second lens 502 on the optical axis may be positive. The radius of curvature of the upper-side surface S4 of the second lens 502 may be negative. The radius of curvature of the upper-side surface S4 of the second lens 502 on the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface S3 of the second lens 502 may be greater than the absolute value of the radius of curvature of the upper-side surface S4 of the second lens 502. The second lens 502 may be a solid lens. The two surfaces of the second lens 502 may be formed as aspherical surfaces. One of the two surfaces of the second lens 502 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0407] The second lens 502 may satisfy the range of 1.6 < N2 < 1.7. Additionally, the second lens 502 may satisfy the range of 1.62 < N2 < 1.65. N2 is the refractive index of the second lens 502. The second lens 502 may satisfy the range of 20 < V2 < 30. Additionally, the second lens 502 may satisfy the range of 22 < V2 < 25. V2 is the Abbe number of the second lens 502.

[0408] The lens unit may include a third lens 503. The third lens 503 may be the third lens arranged starting from the object side. The third lens 503 may be the third lens adjacent to the object side. The third lens 503 may be arranged between the second lens 502 and the image side. The third lens 503 may be arranged between the second lens 502 and the fourth lens 504. An additional lens may be arranged between the third lens 503 and the second lens 502 or between the third lens 503 and the fourth lens 504.

[0409] The third lens 503 may have a positive (+) refractive power. The third lens 503 may be formed with two convex surfaces. The third lens 503 may be formed with a convex object-side surface S5. The third lens 503 may have an object-side surface S5 that is convexly formed with respect to the optical axis. The third lens 503 may have an upper-side surface S6 that is convexly formed. The third lens 503 may have an upper-side surface S6 that is convexly formed with respect to the optical axis. The fifth surface S5 of the third lens 503 may be arranged such that there are no critical points from the optical axis OA to the end of the effective region. The sixth surface S6 may be arranged such that there is at least one critical point from the optical axis OA to the end of the effective region.

[0410] The radius of curvature of the object-side surface S5 of the third lens 503 may be positive. The radius of curvature of the object-side surface S5 of the third lens 503 on the optical axis may be positive. The radius of curvature of the upper-side surface S6 of the third lens 503 may be negative. The radius of curvature of the upper-side surface S6 of the third lens 503 with respect to the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the third lens 503 may be greater than the absolute value of the radius of curvature of the upper-side surface of the third lens 503. The third lens 503 may be a solid lens. The two surfaces of the third lens 503 may be formed as aspherical surfaces. One of the two surfaces of the third lens 503 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0411] The third lens 503 may satisfy the range of 1.5 < N3 < 1.6. In addition, the third lens 503 may satisfy the range of 1.52 < N3 < 1.58. N3 is the refractive index of the third lens 503. The third lens 503 may satisfy the range of 50 < V3 < 60. In addition, the third lens 503 may satisfy the range of 52 < V3 < 58. V3 is the Abbe number of the third lens 503.

[0412] The lens unit may include a fourth lens 504. The fourth lens 504 may be the fourth lens arranged from the object side. The fourth lens 504 may be the sixth lens arranged from the image side. The fourth lens 504 may be arranged between the third lens 503 and the image side. The fourth lens 504 may be arranged between the third lens 503 and the fifth lens 505. An additional lens may be arranged between the fourth lens 504 and the third lens 503 or between the fourth lens 504 and the fifth lens 505.

[0413] The fourth lens 504 may have a positive (+) refractive power. The fourth lens 504 may have a convex meniscus shape on the upper side. The fourth lens 504 may have an object-side surface S7 formed concavely. The fourth lens 504 may have an object-side surface S7 formed concavely with respect to the optical axis. The fourth lens 504 may have an upper-side surface S8 formed convexly. The fourth lens 504 may have an upper-side surface S8 formed convexly with respect to the optical axis. The seventh surface S of the fourth lens 504 may extend to the end of the effective region with respect to the optical axis OA without any critical points. The eighth surface S8 may extend to the end of the effective region with respect to the optical axis OA without at least one critical point.

[0414] The radius of curvature of the object-side surface S7 of the fourth lens 504 may be negative. The radius of curvature of the object-side surface S7 of the fourth lens 504 on the optical axis may be negative. The radius of curvature of the upper-side surface S8 of the fourth lens 504 may be negative. The radius of curvature of the upper-side surface S8 of the fourth lens 504 on the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface S7 of the fourth lens 504 may be greater than the absolute value of the radius of curvature of the upper-side surface S8 of the fourth lens 504. The fourth lens 504 may be a solid lens. The two surfaces of the fourth lens 504 may be formed as aspherical surfaces. One of the two surfaces of the fourth lens 504 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0415] The fourth lens 504 may satisfy the range of 1.5 < N4 < 1.6. In addition, the fourth lens 504 may satisfy the range of 1.52 < N4 < 1.58. N4 is the refractive index of the fourth lens 504. The fourth lens 504 may satisfy the range of 50 < V4 < 60. In addition, the fourth lens 504 may satisfy the range of 52 < V4 < 58. V4 is the Abbe number of the fourth lens 504.

[0416] The lens unit may include a fifth lens 505. The fifth lens 505 may be the fifth lens arranged starting from the object side. The fifth lens 505 may be the fifth lens arranged starting from the image side. The fifth lens 505 may be arranged between the fourth lens 504 and the image side. The fifth lens 505 may be arranged between the fourth lens 504 and the sixth lens 506. An additional lens may be arranged between the fifth lens 505 and the fourth lens 504 or between the fifth lens 505 and the sixth lens 506.

[0417] The fifth lens 505 may have a negative (minus) diopter. The fifth lens 505 may have a convex meniscus shape on the object side. The fifth lens 505 may have an object-side surface S9 formed convexly. The fifth lens 505 may have an object-side surface S9 formed convexly with respect to the optical axis. The fifth lens 505 may have an upper-side surface S10 formed concavely. The fifth lens 505 may have an upper-side surface S10 formed concavely with respect to the optical axis. The ninth surface S9 of the fifth lens 505 may be set such that there is no critical point from the optical axis OA to the end of the effective area. The tenth surface S10 may be set such that there is no at least one critical point from the optical axis OA to the end of the effective area.

[0418] The radius of curvature of the object-side surface S9 of the fifth lens 505 may be positive. The radius of curvature of the object-side surface S9 of the fifth lens 505 on the optical axis may be positive. The radius of curvature of the upper-side surface S10 of the fifth lens 505 may be positive. The radius of curvature of the upper-side surface S10 of the fifth lens 505 along the optical axis may be positive. The absolute value of the radius of curvature of the object-side surface S9 of the fifth lens 505 may be greater than the absolute value of the radius of curvature of the upper-side surface S10 of the fifth lens 505. The fifth lens 505 may be a solid lens. The two surfaces of the fifth lens 505 may be formed as aspherical surfaces. One of the two surfaces of the fifth lens 505 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0419] The fifth lens 505 may satisfy the range of 1.6 < N5 < 1.7. In addition, the fifth lens 505 may satisfy the range of 1.62 < N5 < 1.65. N5 is the refractive index of the fifth lens 505. The fifth lens 505 may satisfy the range of 20 < V5 < 30. In addition, the fifth lens 505 may satisfy the range of 20 < V5 < 25. V5 is the Abbe number of the fifth lens 505.

[0420] The lens unit may include a sixth lens 506. The sixth lens 506 may be the sixth lens provided starting from the object side. The sixth lens 506 may be the fourth lens provided starting from the image side. The sixth lens 506 may be disposed between the fifth lens 505 and the seventh lens 507. The sixth lens 506 may be disposed between the fifth lens 505 and the image side. An additional lens may be disposed between the sixth lens 506 and the fifth lens 505 or between the sixth lens 506 and the seventh lens 507.

[0421] The sixth lens 506 may have a negative (minus one) diopter. The sixth lens 506 may have a convex meniscus shape on the image side. The sixth lens 506 may have an object-side surface S11 formed recessively. The sixth lens 506 may have an object-side surface S11 recessed with respect to the optical axis. The sixth lens 506 may have a convex upper surface S12. The sixth lens 506 may have an upper surface S12 convex with respect to the optical axis. The eleventh surface S11 of the sixth lens 506 may be set such that there are no critical points from the optical axis OA to the end of the effective area. The twelfth surface S12 may be set such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0422] The radius of curvature of the object-side surface S11 of the sixth lens 506 may be negative. The radius of curvature of the object-side surface S11 of the sixth lens 506 on the optical axis may be negative. The radius of curvature of the upper surface S12 of the sixth lens 506 may be negative. The radius of curvature of the upper surface S12 of the sixth lens 506 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the sixth lens 506 may be less than the absolute value of the radius of curvature of the upper surface of the sixth lens 506. The sixth lens 506 may be a solid lens. The two surfaces of the sixth lens 506 may be formed as aspherical surfaces. One of the two surfaces of the sixth lens 506 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0423] The sixth lens 506 may satisfy the range of 1.6 < N6 < 1.7. In addition, the sixth lens 506 may satisfy the range of 1.62 < N6 < 1.65. N6 is the refractive index of the sixth lens 506. The sixth lens 506 may satisfy the range of 20 < V6 < 30. In addition, the sixth lens 506 may satisfy the range of 20 < V6 < 25. V6 is the Abbe number of the sixth lens 506.

[0424] The lens unit may include a seventh lens 507. The seventh lens 507 may be the seventh lens arranged from the object side. The seventh lens 507 may be the third lens arranged from the image side. The seventh lens 507 may be arranged between the sixth lens 506 and the eighth lens 508. The seventh lens 507 may be arranged between the sixth lens 506 and the image side. An additional lens may be arranged between the seventh lens 507 and the sixth lens 506 or between the seventh lens 507 and the eighth lens 508.

[0425] The seventh lens 507 may have a positive (+) refractive power. The seventh lens 507 may have a convex meniscus shape on the upper side. The seventh lens 507 may have an object-side surface S13 formed recessively. The seventh lens 507 may have an object-side surface S13 formed recessively with respect to the optical axis. The seventh lens 507 may have an upper-side surface S14 formed convexly. The seventh lens 507 may have an upper-side surface S14 formed convexly with respect to the optical axis. The object-side surface or the upper-side surface of the seventh lens 507 may include at least one inflection point.

[0426] The radius of curvature of the object-side surface S13 of the seventh lens 507 may be negative. The radius of curvature of the object-side surface S13 of the seventh lens 507 with respect to the optical axis may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 507 may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 507 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the seventh lens 507 may be greater than the absolute value of the radius of curvature of the upper-side surface of the seventh lens 507. The seventh lens 507 may be a solid lens. The two surfaces of the seventh lens 507 may be formed as aspherical surfaces. One of the two surfaces of the seventh lens 507 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The thirteenth surface S13 of the seventh lens 507 may be set such that there are no critical points from the optical axis OA to the end of the effective region. The fourteenth surface S14 may be set such that there is no at least one critical point from the optical axis OA to the end of the effective region.

[0427] The seventh lens 507 may satisfy the range of 1.5 < N7 < 1.6. In addition, the seventh lens 507 may satisfy the range of 1.52 < N7 < 1.58. N7 is the refractive index of the seventh lens 507. The seventh lens 507 may satisfy the range of 50 < V7 < 60. In addition, the seventh lens 507 may satisfy the range of 52 < V7 < 58. V6 is the Abbe number of the seventh lens 507.

[0428] The lens unit may include an eighth lens 508. The eighth lens 508 may be the eighth lens arranged from the object side. The eighth lens 508 may be the second lens arranged from the image side. The eighth lens 508 may be arranged between the seventh lens 507 and the ninth lens 509. The eighth lens 508 may be arranged between the seventh lens 507 and the image side. An additional lens may be arranged between the eighth lens 508 and the seventh lens 507 or between the eighth lens 508 and the ninth lens 509.

[0429] The eighth lens 508 may have a negative (minus) diopter. The eighth lens 508 may have a convex meniscus shape on the upper side. The eighth lens 508 may have an object-side surface S15 formed recessedly. The eighth lens 508 may have an object-side surface S15 that is recessed with respect to the optical axis. The eighth lens 508 may have a convex upper-side surface S16. The eighth lens 508 may have an upper-side surface S16 that is convex with respect to the optical axis. The fifteenth surface S15 of the eighth lens 508 may be arranged such that there are no critical points from the optical axis OA to the end of the effective area. The sixteenth surface S16 may be arranged such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0430] The radius of curvature of the object-side surface S15 of the eighth lens 508 may be negative. The radius of curvature of the object-side surface S16 of the eighth lens 508 on the optical axis may be negative. The radius of curvature of the upper-side surface S16 of the eighth lens 508 may be negative. The radius of curvature of the upper-side surface S16 of the eighth lens 508 along the optical axis may be negative. The value of the radius of curvature of the object-side surface of the eighth lens 508 may be greater than the value of the radius of curvature of the upper-side surface of the eighth lens 508. The eighth lens 508 may be a solid lens. The two surfaces of the eighth lens 508 may be formed as aspherical surfaces. One of the two surfaces of the eighth lens 508 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0431] The eighth lens 508 may satisfy the range of 1.5 < N8 < 1.6. In addition, the eighth lens 508 may satisfy the range of 1.52 < N8 < 1.58. N8 is the refractive index of the eighth lens 508. The eighth lens 508 may satisfy the range of 50 < V8 < 60. In addition, the eighth lens 508 may satisfy the range of 52 < V8 < 58. V8 is the Abbe number of the eighth lens 508.

[0432] The lens unit may include a ninth lens 509. The ninth lens 509 may be the lens closest to the image side. The ninth lens 509 may be arranged between the eighth lens 508 and the image side. An additional lens may be arranged between the ninth lens 509 and the eighth lens 508 or between the ninth lens 509 and the filter 900.

[0433] The ninth lens 509 may have a negative (-) diopter. The ninth lens 509 may have a concave shape on both sides. The ninth lens 509 may have an object-side surface S17 formed recessedly. The ninth lens 509 may have an object-side surface S17 formed recessedly with respect to the optical axis. The ninth lens 509 may have an upper-side surface S18 formed recessedly. The ninth lens 509 may have an upper-side surface S18 formed recessedly with respect to the optical axis. The object-side surface or the upper-side surface of the ninth lens 509 may include at least one inflection point.

[0434] The object-side surface S17 and the upper-side surface S18 of the ninth lens 509 may have points with the same tilt angle in the region from 75% to 80% of the effective diameter. The object-side surface S17 and the upper-side surface S18 of the ninth lens 509 may have tangents parallel to each other at points in the region from 75% to 80% of the effective diameter. In this way, by making the specular reflection path and the normal path coincide, specular reflection can be minimized.

[0435] The radius of curvature of the object-side surface S17 of the ninth lens 509 may be negative. The radius of curvature of the object-side surface S17 of the ninth lens 509 along the optical axis may be negative. The radius of curvature of the upper-side surface S18 of the ninth lens 509 may be positive. The radius of curvature of the upper-side surface S18 of the ninth lens 509 along the optical axis may be positive. The value of the radius of curvature of the object-side surface of the ninth lens 509 may be greater than the value of the radius of curvature of the upper-side surface of the ninth lens 509. The ninth lens 509 may be a solid lens. The two surfaces of the ninth lens 509 may be formed as aspherical surfaces. One of the two surfaces of the ninth lens 509 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The ninth lens 509 may have a surface including more than one inflection point.

[0436] The seventeenth surface S17 of the ninth lens 509 may be set such that there is no critical point from the optical axis OA to the end of the effective region. The eighteenth surface S18 of the ninth lens 509 may have a critical point from the optical axis OA to the end of the effective region. If the eighteenth surface S18 has a critical point, the critical point may be located in the range from 50% to 60% of the effective radius r92 from the optical axis OA, preferably in the range from 54% to 57%. The critical point of the eighteenth surface S18 may be located in the range from 3.5 mm to 4.2 mm from the optical axis OA, preferably in the range from 3.8 mm to 4 mm.

[0437] The ninth lens 509 may satisfy the range of 1.5 < N9 < 1.6. In addition, the ninth lens 509 may satisfy the range of 1.52 < N9 < 1.58. N9 is the refractive index of the ninth lens 509. The ninth lens 509 may satisfy the range of 50 < V9 < 60. In addition, the ninth lens 509 may satisfy the range of 52 < V9 < 58. V9 is the Abbe number of the ninth lens 509.

[0438] The lens unit may include an aperture STOP. The aperture can control the amount of light entering the optical system. Among the lenses located between the object and the aperture, the effective diameter of the lens surface tends to increase from the object to the aperture. For the lens surface disposed between the aperture and the sensor, the effective diameter of the lens surface has a tendency to decrease from the aperture to the sensor side. The fact that the effective diameter of the lens surface has a tendency to increase or decrease does not mean that the effective diameter of the lens surface only increases or decreases. For example, this also includes the case where the effective diameter of the lens surface increases from the aperture to the sensor side and then decreases.

[0439] The aperture STOP may be disposed between the third lens 503 and the fourth lens 504. The aperture STOP may be arranged to be closer to the fourth lens 504 than the third lens 503. The aperture STOP may be spaced apart from the object side surface of the third lens 503. The aperture STOP can adjust the amount of light entering from the subject. The aperture STOP can adjust the amount of light passing through the third lens 503. The aperture STOP can adjust the amount of light entering the fourth lens 504. The aperture STOP may include an aperture diaphragm.

[0440] The optical system or the camera module may include a filter 900. The filter 900 may be disposed between the lens closest to the sensor side among the lenses of the lens unit 100 and the image sensor 800. For example, the filter 900 may be disposed between the nth lens and the image sensor 800.

[0441] A cover glass may be disposed between the filter 900 and the image sensor 800 to protect the upper part of the image sensor 800 and prevent a decrease in the reliability of the image sensor 800. The cover glass may be removable. The cover glass may be a protective glass.

[0442] The filter 900 may include an infrared filter or an infrared cut-off filter (IR cut-off). The filter 900 can transmit light within a set wavelength band and filter out light in other wavelength bands. When the filter 900 includes an infrared filter, it can block the transfer of radiant heat emitted from external light to the image sensor 800. In addition, the filter 900 can transmit visible light and reflect infrared light.

[0443] The concept of the diagonal field of view (DFOV) of the imaging lens according to the present embodiment will be described below.

[0444] The imaging lens may have a field of view (FOV) of more than 70°. In this case, the field of view (FOV) may be the diagonal field of view (DFOV). The diagonal field of view (DFOV) may be different from the horizontal field of view (HFOV) and the vertical field of view (VFOV). For example, the horizontal field of view (HFOV) may be 0.8 times the diagonal field of view (DFOV). In addition, the field of view (FOV) may be different from the half field of view (HFOV). The field of view (FOV) refers to the diameter of an imaginary circle connecting the four corners of the image sensor, while the horizontal field of view (HFOV) may refer to the radius of the above-mentioned imaginary circle. In other words, the field of view (FOV) may be twice the horizontal field of view (HFOV).

[0445] The following mathematical equation can be used to calculate the diagonal field of view (DFOV).

[0446] [Mathematical equation]

[0447] DFOV = 2 * arctan(ImgH / F)

[0448] Here, ImgH * 2 refers to the diagonal length of the effective area of the image sensor 800, and F refers to the effective focal length of the entire optical system.

[0449]

Table 10

[0450]

[0451]

[0452] Table 10 shows the surface number (surface), radius of curvature (radius), center thickness of each lens or the distance between lens surfaces (thickness), refractive index (nd), Abbe number (vd), effective radius (semi-aperture), and focal length of the lens according to the fifth embodiment of the present invention. Here, the unit of the radius of curvature and the thickness or distance may be mm.

[0453]

Table 11

[0454]

[0455]

[0456] Table 11 shows the characteristics of the optical system according to the fifth embodiment of the present invention.

[0457] TTL refers to the distance along the optical axis from the vertex of the object-side surface of the first lens 501 to the image surface, SD refers to the distance along the optical axis from the aperture STOP to the upper surface of the ninth lens 509, TD represents the distance along the optical axis from the vertex of the object-side surface of the first lens 501 to the upper surface of the ninth lens 509, F represents the total focal length, F_LG1 represents the combined focal length of the first lens 501 to the third lens 503 on the object side of the aperture STOP, F_LG2 represents the combined focal length of the fourth lens 504 to the ninth lens 509 on the image side of the aperture STOP, Fno represents the ratio of the focal length of the lens to the effective diameter, ImgH represents the distance from the optical axis OA to the diagonal end of the image sensor 800 or half of the maximum diagonal length, HFOV represents the diagonal field of view of the optical system, EPD represents the diameter of the entrance pupil (effective aperture), BFL represents the distance along the optical axis from the upper surface of the ninth lens 509 to the image surface, and ET1 to ET9 represent the thicknesses of the edge regions of each lens.

[0458] The configuration of the optical system according to the sixth embodiment of the present invention will be described below with reference to the accompanying drawings.

[0459] Figure 19 is a side cross-sectional view of the optical system according to the sixth embodiment and a camera module having the optical system, Figure 20 is a table showing the values of the aspherical coefficient and the conic constant (k) of each lens surface in the optical system according to the sixth embodiment, Figure 21 is a table showing the thicknesses of each lens and the spacing between adjacent lenses in the optical system according to the sixth embodiment, Figure 22 is a table showing the sagittal height values of each lens surface in the optical system according to the sixth embodiment, Figure 23 is a graph showing the aberration characteristic data of the optical system according to the sixth embodiment, Figure 24 is a graph showing the diffraction MTF (modulation transfer function) data of the optical system according to the sixth embodiment.

[0460] The optical system according to the sixth embodiment may include a lens unit, and the lens unit may include a first lens 601 to a ninth lens 609. The first lens to the ninth lens 601, 602, 603, 604, 605, 606, 607, 608, 609 may be arranged in sequence along the optical axis OA. Light corresponding to the information of the object may pass through the first lens 601 to the ninth lens 609 and the filter 900, and enter the image sensor 800.

[0461] The lens unit may be arranged in order from the object side to the image side as a first lens 601, a second lens 602, a third lens 603, an aperture STOP, a fourth lens 604, a fifth lens 605, a sixth lens 606, a seventh lens 607, an eighth lens 608, and a ninth lens 609.

[0462] In another embodiment, one or more additional lenses, plates, or optical components may be added between the first lens 601 and the ninth lens 609. In addition, one or more additional lenses, plates, or optical components may be added before the first lens 601 or after the ninth lens 609. In addition, one or more additional lenses, plates, or optical components may be added between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter 900 may be a flat lens. The diopter of the flat lens may be "0". The diopter of the flat lens may be zero. In addition, a filter layer may be provided between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter layer may be coated to serve as a filter.

[0463] The lens unit may include a first lens 601. The first lens 601 may be closest to the object side. The first lens 601 may be the first lens arranged on the object side. The first lens 601 may be the first lens adjacent to the object side. An additional lens may be provided between the first lens 601 and the second lens 602. The second lens to the eighth lens 602, 603, 604, 605, 606, 607, 608 may be arranged between the first lens 601 and the ninth lens 609. Additional lenses other than the second lens to the eighth lens 602, 603, 604, 605, 606, 607, 608 may be arranged between the first lens 601 and the ninth lens 609. At least two lenses may be additionally arranged between at least two of the first lens to the ninth lens 601, 602, 603, 604, 605, 606, 607, 608, 609.

[0464] The first lens 601 may have a negative (minus) diopter. The first lens 601 may have a convex meniscus shape on the object side. The first lens 601 may have an object-side surface S1 formed convexly. The first lens 601 may have an object-side surface S1 formed convexly with respect to the optical axis. The first lens 601 may have an upper-side surface S2 formed concavely. The first lens 601 may have an upper-side surface S2 formed concavely with respect to the optical axis. The first surface S1 of the first lens 601 may be arranged such that there is no critical point from the optical axis OA to the end of the effective area. The second surface S2 may be arranged such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0465] The radius of curvature of the object-side surface S1 of the first lens 601 can be a positive number. The radius of curvature of the object-side surface S1 of the first lens 601 on the optical axis can be a positive number. The radius of curvature of the upper-side surface S2 of the first lens 601 can be a positive number. The radius of curvature of the upper-side surface S2 of the first lens 601 along the optical axis can be a positive number. The absolute value of the radius of curvature of the object-side surface S1 of the first lens 601 can be greater than the absolute value of the radius of curvature of the upper-side surface S2 of the first lens 601. The first lens 601 can be a solid lens. The two surfaces of the first lens 601 can be formed as aspherical surfaces. One of the two surfaces of the first lens 601 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface.

[0466] The first lens 601 can satisfy the range of 1.5 < N1 < 1.6. In addition, the first lens 601 can satisfy the range of 1.52 < N1 < 1.58. N1 is the refractive index of the first lens 601. The first lens 601 can satisfy the range of 50 < V1 < 60. In addition, the first lens 601 can satisfy the range of 52 < V1 < 58. V1 is the Abbe number of the first lens 601.

[0467] The lens unit can include a second lens 602. The second lens 602 can be the second lens disposed on the object side. The second lens 602 can be the second lens adjacent to the object side. The second lens 602 can be disposed between the first lens 601 and the image side. The second lens 602 can be disposed between the first lens 601 and the third lens 603. An additional lens can be disposed between the second lens 602 and the first lens 601 or between the second lens 602 and the third lens 603.

[0468] The second lens 602 can have a negative diopter. The second lens 602 can have a convex meniscus shape on the object side. The second lens 602 can have a convex object-side surface S3. The second lens 602 can have an object-side surface S3 that is convex with respect to the optical axis. The second lens 602 can have a concave upper-side surface S4. The second lens 602 can have an upper-side surface S4 that is concave with respect to the optical axis. The third surface S3 of the second lens 602 can be set such that there are no critical points from the optical axis OA to the end of the effective area. The fourth surface S4 can be set such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0469] The radius of curvature of the object-side surface S3 of the second lens 602 may be a positive number. The radius of curvature of the object-side surface S3 of the second lens 602 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S4 of the second lens 602 may be a negative number. The radius of curvature of the upper-side surface S4 of the second lens 602 on the optical axis may be a negative number. The absolute value of the radius of curvature of the object-side surface S3 of the second lens 602 may be greater than the absolute value of the radius of curvature of the upper-side surface S4 of the second lens 602. The second lens 602 may be a solid lens. The two surfaces of the second lens 602 may be formed as aspherical surfaces. One of the two surfaces of the second lens 602 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0470] The second lens 602 may satisfy the range of 1.6 < N2 < 1.7. In addition, the second lens 602 may satisfy the range of 1.62 < N2 < 1.65. N2 is the refractive index of the second lens 602. The second lens 602 may satisfy the range of 20 < V2 < 30. In addition, the second lens 602 may satisfy the range of 22 < V2 < 25. V2 is the Abbe number of the second lens 602.

[0471] The lens unit may include a third lens 603. The third lens 603 may be the third lens arranged starting from the object side. The third lens 603 may be the third lens adjacent to the object side. The third lens 603 may be disposed between the second lens 602 and the image side. The third lens 603 may be disposed between the second lens 602 and the fourth lens 604. An additional lens may be disposed between the third lens 603 and the second lens 602 or between the third lens 603 and the fourth lens 604.

[0472] The third lens 603 may have a positive (+) refractive power. The third lens 603 may be formed with two convex surfaces. The third lens 603 may be formed with a convex object-side surface S5. The third lens 603 may have an object-side surface S5 formed to be convex with respect to the optical axis. The third lens 603 may have a convex upper-side surface S6. The third lens 603 may have an upper-side surface S6 formed to be convex with respect to the optical axis. The fifth surface S5 of the third lens 603 may be set such that there is no critical point from the optical axis OA to the end of the effective region. The sixth surface S6 may be set such that there is at least one critical point from the optical axis OA to the end of the effective region.

[0473] The radius of curvature of the object-side surface S5 of the third lens 603 can be a positive number. The radius of curvature of the object-side surface S5 of the third lens 603 on the optical axis can be a positive number. The radius of curvature of the upper-side surface S6 of the third lens 603 can be a negative number. The radius of curvature of the upper-side surface S6 of the third lens 603 along the optical axis can be a negative number. The absolute value of the radius of curvature of the object-side surface of the third lens 603 can be greater than the absolute value of the radius of curvature of the upper-side surface of the third lens 603. The third lens 603 can be a solid lens. The two surfaces of the third lens 603 can be formed as aspherical surfaces. One of the two surfaces of the third lens 603 can be formed as a spherical surface, and the other surface can be formed as an aspherical surface.

[0474] The third lens 603 can satisfy the range of 1.5 < N3 < 1.6. In addition, the third lens 603 can satisfy the range of 1.52 < N3 < 1.58. N3 is the refractive index of the third lens 603. The third lens 603 can satisfy the range of 50 < V3 < 60. In addition, the third lens 603 can satisfy the range of 52 < V3 < 58. V3 is the Abbe number of the third lens 603.

[0475] The lens unit can include a fourth lens 604. The fourth lens 604 can be the fourth lens arranged from the object side. The fourth lens 604 can be the sixth lens arranged from the image side. The fourth lens 604 can be arranged between the third lens 603 and the image side. The fourth lens 604 can be arranged between the third lens 603 and the fifth lens 605. An additional lens can be arranged between the fourth lens 604 and the third lens 603 or between the fourth lens 604 and the fifth lens 605.

[0476] The fourth lens 604 can have a positive (+) diopter. The fourth lens 604 can have a convex meniscus shape on the image side. The fourth lens 604 can have an object-side surface S7 formed concavely. The fourth lens 604 can have an object-side surface S7 formed concavely with respect to the optical axis. The fourth lens 604 can have an upper-side surface S8 formed convexly. The fourth lens 604 can have an upper-side surface S8 convex with respect to the optical axis. The seventh surface S of the fourth lens 604 can be set such that there are no critical points from the optical axis OA to the end of the effective area. The eighth surface S8 can be set such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0477] The radius of curvature of the object-side surface S7 of the fourth lens 604 may be negative. The radius of curvature of the object-side surface S7 of the fourth lens 604 on the optical axis may be negative. The radius of curvature of the upper-side surface S8 of the fourth lens 604 may be negative. The radius of curvature of the upper-side surface S8 of the fourth lens 604 on the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface S7 of the fourth lens 604 may be greater than the absolute value of the radius of curvature of the upper-side surface S8 of the fourth lens 604. The fourth lens 604 may be a solid lens. The two surfaces of the fourth lens 604 may be formed as aspherical surfaces. One of the two surfaces of the fourth lens 604 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0478] The fourth lens 604 may satisfy the range of 1.5 < N4 < 1.6. In addition, the fourth lens 604 may satisfy the range of 1.52 < N4 < 1.58. N4 is the refractive index of the fourth lens 604. The fourth lens 604 may satisfy the range of 50 < V4 < 60. In addition, the fourth lens 604 may satisfy the range of 52 < V4 < 58. V4 is the Abbe number of the fourth lens 604.

[0479] The lens unit may include a fifth lens 605. The fifth lens 605 may be the fifth lens arranged starting from the object side. The fifth lens 605 may be the fifth lens arranged starting from the image side. The fifth lens 605 may be arranged between the fourth lens 604 and the image side. The fifth lens 605 may be arranged between the fourth lens 604 and the sixth lens 606. An additional lens may be arranged between the fifth lens 605 and the fourth lens 604 or between the fifth lens 605 and the sixth lens 606.

[0480] The fifth lens 605 may have a negative (minus) diopter. The fifth lens 605 may have a convex meniscus shape on the object side. The fifth lens 605 may have an object-side surface S9 formed convexly. The fifth lens 605 may have an object-side surface S9 formed convexly with respect to the optical axis. The fifth lens 605 may have an upper-side surface S10 formed concavely. The fifth lens 605 may have an upper-side surface S10 formed concavely with respect to the optical axis. The ninth surface S9 of the fifth lens 605 may be arranged such that there are no critical points from the optical axis OA to the end of the effective area. The tenth surface S10 may be arranged such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0481] The radius of curvature of the object-side surface S9 of the fifth lens 605 may be a positive number. The radius of curvature of the object-side surface S9 of the fifth lens 605 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S10 of the fifth lens 605 may be a positive number. The radius of curvature of the upper-side surface S10 of the fifth lens 605 along the optical axis may be a positive number. The absolute value of the radius of curvature of the object-side surface S9 of the fifth lens 605 may be greater than the absolute value of the radius of curvature of the upper-side surface S10 of the fifth lens 605. The fifth lens 605 may be a solid lens. The two surfaces of the fifth lens 605 may be formed as aspherical surfaces. One of the two surfaces of the fifth lens 605 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

[0482] The fifth lens 605 may satisfy the range of 1.6 < N5 < 1.7. In addition, the fifth lens 605 may satisfy the range of 1.62 < N5 < 1.65. N5 is the refractive index of the fifth lens 605. The fifth lens 605 may satisfy the range of 20 < V5 < 30. In addition, the fifth lens 605 may satisfy the range of 20 < V5 < 25. V5 is the Abbe number of the fifth lens 605.

[0483] The lens unit may include a sixth lens 606. The sixth lens 606 may be the sixth lens arranged from the object side. The sixth lens 606 may be the fourth lens arranged from the image side. The sixth lens 606 may be arranged between the fifth lens 605 and the seventh lens 607. The sixth lens 606 may be arranged between the fifth lens 605 and the image side. An additional lens may be arranged between the sixth lens 606 and the fifth lens 605 or between the sixth lens 606 and the seventh lens 607.

[0484] The sixth lens 606 may have a negative (minus) refractive power. The sixth lens 606 may have a convex meniscus shape on the upper side. The sixth lens 606 may have an object-side surface S11 formed recessedly. The sixth lens 606 may have an object-side surface S11 recessed with respect to the optical axis. The sixth lens 606 may have a convex upper-side surface S12. The sixth lens 606 may have an upper-side surface S12 convex with respect to the optical axis. The eleventh surface S11 of the sixth lens 606 may be set such that there are no critical points from the optical axis OA to the end of the effective area. The twelfth surface S12 may be set such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0485] The radius of curvature of the object-side surface S11 of the sixth lens 606 may be negative. The radius of curvature of the object-side surface S11 of the sixth lens 606 on the optical axis may be negative. The radius of curvature of the upper-side surface S12 of the sixth lens 606 may be negative. The radius of curvature of the upper-side surface S12 of the sixth lens 606 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the sixth lens 606 may be less than the absolute value of the radius of curvature of the upper-side surface of the sixth lens 606. The sixth lens 606 may be a solid lens. The two surfaces of the sixth lens 606 may be formed as aspherical surfaces. One of the two surfaces of the sixth lens 606 may be formed as a spherical surface and the other surface may be formed as an aspherical surface. The sixth lens 606 may have a surface including more than one inflection point.

[0486] The sixth lens 606 may satisfy the range of 1.6 < N6 < 1.7. In addition, the sixth lens 606 may satisfy the range of 1.62 < N6 < 1.65. N6 is the refractive index of the sixth lens 606. The sixth lens 606 may satisfy the range of 20 < V6 < 30. In addition, the sixth lens 606 may satisfy the range of 20 < V6 < 25. V6 is the Abbe number of the sixth lens 606.

[0487] The lens unit may include a seventh lens 607. The seventh lens 607 may be the seventh lens arranged from the object side. The seventh lens 607 may be the third lens arranged from the image side. The seventh lens 607 may be arranged between the sixth lens 606 and the eighth lens 608. The seventh lens 607 may be arranged between the sixth lens 606 and the image side. An additional lens may be arranged between the seventh lens 607 and the sixth lens 606 or between the seventh lens 607 and the eighth lens 608.

[0488] The seventh lens 607 may have a positive (+) diopter. The seventh lens 607 may have a convex meniscus shape on the image side. The seventh lens 607 may have an object-side surface S13 formed recessively. The seventh lens 607 may have an object-side surface S13 recessed with respect to the optical axis. The seventh lens 607 may have a convex upper-side surface S14. The seventh lens 607 may have an upper-side surface S14 convex with respect to the optical axis. The thirteenth surface S13 of the seventh lens 607 may be set such that there are no critical points from the optical axis OA to the end of the effective area. The fourteenth surface S14 may be set such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0489] The radius of curvature of the object-side surface S13 of the seventh lens 607 may be negative. The radius of curvature of the object-side surface S13 of the seventh lens 607 on the optical axis may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 607 may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 607 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the seventh lens 607 may be greater than the absolute value of the radius of curvature of the upper-side surface of the seventh lens 607. The seventh lens 607 may be a solid lens. The two surfaces of the seventh lens 607 may be formed as aspherical surfaces. One of the two surfaces of the seventh lens 607 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The seventh lens 607 may have a surface including more than one inflection point.

[0490] The seventh lens 607 may satisfy the range of 1.5 < N7 < 1.6. In addition, the seventh lens 607 may satisfy the range of 1.52 < N7 < 1.58. N7 is the refractive index of the seventh lens 607. The seventh lens 607 may satisfy the range of 50 < V7 < 60. In addition, the seventh lens 607 may satisfy the range of 52 < V7 < 58. V6 is the Abbe number of the seventh lens 607.

[0491] The lens unit may include an eighth lens 608. The eighth lens 608 may be the eighth lens provided starting from the object side. The eighth lens 608 may be the second lens provided starting from the image side. The eighth lens 608 may be disposed between the seventh lens 607 and the ninth lens 609. The eighth lens 608 may be disposed between the seventh lens 607 and the image side. An additional lens may be disposed between the eighth lens 608 and the seventh lens 607 or between the eighth lens 608 and the ninth lens 609.

[0492] The eighth lens 608 may have a negative (minus) diopter. The eighth lens 608 may have a convex meniscus shape on the upper side. The eighth lens 608 may have an object-side surface S15 formed recessedly. The eighth lens 608 may have an object-side surface S15 recessed with respect to the optical axis. The eighth lens 608 may have a convex upper-side surface S16. The eighth lens 608 may have an upper-side surface S16 convex with respect to the optical axis. The fifteenth surface S15 of the eighth lens 608 may be set such that there are no critical points from the optical axis OA to the end of the effective area. The sixteenth surface S16 may be set such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0493] The radius of curvature of the object-side surface S15 of the eighth lens 608 may be negative. The radius of curvature of the object-side surface S16 of the eighth lens 608 on the optical axis may be negative. The radius of curvature of the upper-side surface S16 of the eighth lens 608 may be negative. The radius of curvature of the upper-side surface S16 of the eighth lens 608 along the optical axis may be negative. The value of the radius of curvature of the object-side surface of the eighth lens 608 may be greater than the value of the radius of curvature of the upper-side surface of the eighth lens 608. The eighth lens 608 may be a solid lens. The two surfaces of the eighth lens 608 may be formed as aspherical surfaces. One of the two surfaces of the eighth lens 608 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The eighth lens 608 may have a surface including more than one inflection point.

[0494] The eighth lens 608 may satisfy the range of 1.5 < N8 < 1.6. In addition, the eighth lens 608 may satisfy the range of 1.52 < N8 < 1.58. N8 is the refractive index of the eighth lens 608. The eighth lens 608 may satisfy the range of 50 < V8 < 60. In addition, the eighth lens 608 may satisfy the range of 52 < V8 < 58. V8 is the Abbe number of the eighth lens 608.

[0495] The lens unit may include a ninth lens 609. The ninth lens 609 may be the lens closest to the image side. The ninth lens 609 may be disposed between the eighth lens 608 and the image side. An additional lens may be disposed between the ninth lens 609 and the eighth lens 608 or between the ninth lens 609 and the filter 900.

[0496] The ninth lens 609 may have a negative (minus) refractive power. The ninth lens 609 may have a meniscus shape convex toward the object side. The ninth lens 609 may have an object-side surface S17 formed convexly. The ninth lens 609 may have an object-side surface S17 formed convexly with respect to the optical axis. The ninth lens 609 may have an upper-side surface S18 formed concavely. The ninth lens 609 may have an upper-side surface S18 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the ninth lens 609 may include at least one inflection point.

[0497] The seventeenth surface S17 of the ninth lens 609 may be set such that there is no critical point from the optical axis OA to the end of the effective area. The eighteenth surface S18 of the ninth lens 609 may have a critical point from the optical axis OA to the end of the effective area. If the eighteenth surface S18 has a critical point, the critical point may be located in the range of 55% to 65% of the effective radius r92 from the optical axis OA, preferably in the range of 58% to 61%. The critical point of the eighteenth surface S18 may be located in the range of 4.0 mm to 4.5 mm from the optical axis OA, preferably in the range of 4.2 mm to 4.4 mm.

[0498] The object-side surface S17 and the upper-side surface S18 of the ninth lens 609 may have points with the same inclination angle in the region of 75% to 80% of the effective diameter. The object-side surface S17 and the upper-side surface S18 of the ninth lens 609 may have tangents parallel to each other at points in the region of 75% to 80% of the effective diameter. In this way, by making the specular reflection (diffuse reflection) path and the normal path coincide, the occurrence of specular reflection (diffuse reflection) can be minimized.

[0499] The radius of curvature of the object-side surface S17 of the ninth lens 609 may be a positive number. The radius of curvature of the object-side surface S17 of the ninth lens 609 along the optical axis may be a positive number. The radius of curvature of the upper-side surface S18 of the ninth lens 609 may be a positive number. The radius of curvature of the upper-side surface S18 of the ninth lens 609 along the optical axis may be a positive number. The value of the radius of curvature of the object-side surface of the ninth lens 609 may be greater than the value of the radius of curvature of the upper-side surface of the ninth lens 609. The ninth lens 609 may be a solid lens. The two surfaces of the ninth lens 609 may be formed as aspherical surfaces. One of the two surfaces of the ninth lens 609 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The ninth lens 609 may have a surface including more than one inflection point.

[0500] The seventeenth surface S17 of the ninth lens 609 may be set to have no critical points from the optical axis OA to the end of the effective region. The eighteenth surface S18 of the ninth lens 609 may have critical points from the optical axis OA to the end of the effective region. If the eighteenth surface S18 has critical points, the critical points may be located in the range of 55% to 65% of the effective radius r92 from the optical axis OA, preferably in the range of 58% to 61%. The critical points of the eighteenth surface S18 may be located in the range of 4 mm to 4.5 mm from the optical axis OA, preferably in the range of 4.2 mm to 4.2 mm.

[0501] The ninth lens 609 may satisfy the range of 1.5 < N9 < 1.6. In addition, the ninth lens 609 may satisfy the range of 1.52 < N9 < 1.58. N9 is the refractive index of the ninth lens 609. The ninth lens 609 may satisfy the range of 50 < V9 < 60. In addition, the ninth lens 609 may satisfy the range of 52 < V9 < 58. V9 is the Abbe number of the ninth lens 609.

[0502] The lens unit may include an aperture STOP. The aperture can control the amount of light entering the optical system. Among the lenses located between the object and the aperture, the effective diameter of the lens surface tends to increase from the object to the aperture. For the lens surface disposed between the aperture and the sensor, the effective diameter of the lens surface has a tendency to decrease from the aperture to the sensor side. The fact that the effective diameter of the lens surface has a tendency to increase or decrease does not mean that the effective diameter of the lens surface only increases or decreases. For example, this also includes the case where the effective diameter of the lens surface increases and then decreases from the aperture to the sensor side.

[0503] The aperture STOP may be disposed between the third lens 603 and the fourth lens 604. The aperture STOP may be arranged to be closer to the fourth lens 604 relative to the third lens 603. The aperture STOP may be spaced apart from the object side surface of the third lens 603. The aperture STOP can adjust the amount of light entering from the subject. The aperture STOP can adjust the amount of light passing through the third lens 603. The aperture STOP can adjust the amount of light entering the fourth lens 604. The aperture STOP may include an aperture diaphragm.

[0504] The optical system or the camera module may include a filter 900. The filter 900 may be disposed between the lens closest to the sensor side among the lenses of the lens unit 100 and the image sensor 800. For example, the filter 900 may be disposed between the nth lens and the image sensor 800.

[0505] A cover glass may be disposed between the filter 900 and the image sensor 800 to protect the upper part of the image sensor 800 and prevent a reduction in the reliability of the image sensor 800. The cover glass may be removed. The cover glass may be used as a protective glass.

[0506] The filter 900 may include an infrared filter or an infrared cut-off filter. The filter 900 can transmit light within a set wavelength band and filter out light in other wavelength bands. When the filter 900 includes an infrared filter, it can block the transfer of radiant heat emitted from external light to the image sensor 800. In addition, the filter 900 can transmit visible light and reflect infrared light.

[0507]

Table 12

[0508]

[0509]

[0510] Table 12 shows the surface number (surface), radius of curvature (radius), center thickness of each lens or distance between lens surfaces (thickness), refractive index (nd), Abbe number (vd), effective radius (semi-aperture), and focal length of the lens according to the sixth embodiment of the present invention. Here, the unit of the radius of curvature and the thickness or distance may be mm.

[0511]

Table 13

[0512] Sixth Embodiment Sixth Embodiment TTL 13.3900 ET1 0.3525 SD(Stop~L9S2) 9.5131 ET2 1.0459 TD(L1S1~L9S2) 12.6907 ET3 0.5739 F 8.1437 ET4 0.5667 F_LG1 15.821 ET5 1.0263 F_LG2 22.00632 ET6 0.5093 Fno 2.3288 ET7 0.3601 ImgH 8.3815 ET8 0.3468 HFOV 38.3600 ET9 1.4811 EPD 3.4970 BFL 2.0583

[0513] Table 13 shows the characteristics of the optical system according to the sixth embodiment of the present invention.

[0514] TTL refers to the distance along the optical axis from the vertex of the object-side surface of the first lens 601 to the image surface, SD refers to the distance along the optical axis from the aperture STOP to the upper surface of the ninth lens 609, TD represents the distance along the optical axis from the vertex of the object-side surface of the first lens 601 to the upper surface of the ninth lens 609, F represents the total focal length, F_LG1 represents the combined focal length of the first lens 601 to the third lens 603 in the object-side direction of the aperture STOP, F_LG2 represents the combined focal length of the fourth lens 604 to the ninth lens 609 in the image-side direction of the aperture STOP, Fno represents the ratio of the focal length of the lens to its effective diameter, ImgH represents the distance from the optical axis OA to the diagonal end of the image sensor 800 or half of the maximum diagonal length, HFOV represents the diagonal field of view of the optical system, EPD represents the diameter of the entrance pupil (effective aperture), BFL represents the distance along the optical axis from the image surface to the upper surface of the ninth lens 609, and ET1 to ET9 represent the thicknesses of the edge regions of each lens.

[0515] The configuration of the optical system according to the seventh embodiment of the present invention will be described below with reference to the accompanying drawings.

[0516] Figure 25 is a side cross-sectional view of the optical system according to the seventh embodiment and a camera module having the optical system, Figure 26 is a table showing the aspherical coefficient and conic constant (k) values of each lens surface in the optical system according to the seventh embodiment, Figure 27 is a table showing the thickness of each lens and the spacing between adjacent lenses in the optical system according to the seventh embodiment, Figure 28 is a table showing the sagittal height values of each lens surface in the optical system according to the seventh embodiment, Figure 29 is a graph showing the aberration characteristic data of the optical system according to the seventh embodiment, Figure 30 is a graph showing the diffraction MTF (modulation transfer function) data of the optical system according to the seventh embodiment.

[0517] The optical system according to the seventh embodiment may include a lens unit, and the lens unit may include a first lens 701 to a ninth lens 709. The first lens to the ninth lens 701, 702, 703, 704, 705, 706, 707, 708, 709 may be sequentially arranged along the optical axis OA. Light corresponding to the information of the object may pass through the first lens 701 to the ninth lens 709 and the filter 900, and enter the image sensor 800.

[0518] The lens unit may be sequentially arranged from the object side to the image side as the first lens 701, the second lens 702, the third lens 703, the aperture STOP, the fourth lens 704, the fifth lens 705, the sixth lens 706, the seventh lens 707, the eighth lens 708, and the ninth lens 709.

[0519] In other embodiments, one or more additional lenses, plates, and optical components may be added between the first lens 701 and the ninth lens 709. In addition, one or more additional lenses, plates, and optical components may be added before the first lens 701 or after the ninth lens 709. In addition, one or more additional lenses, plates, or optical components may be added between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter 900 may be a plano lens. The diopter of the plano lens may be "0". The diopter of the plano lens may be zero. In addition, a filter layer may be provided between the aperture STOP and the lens, between the lens and the filter 900, and between the filter 900 and the image sensor 800. In this case, the filter layer may be coated to be used as a filter.

[0520] The lens unit may include the first lens 701. The first lens 701 may be closest to the object side. The first lens 701 may be the first lens provided on the object side. The first lens 701 may be the first lens adjacent to the object side. An additional lens may be provided between the first lens 701 and the second lens 702. The second lens to the eighth lens 702, 703, 704, 705, 706, 707, 708 may be provided between the first lens 701 and the ninth lens 709. Additional lenses other than the second lens to the eighth lens 702, 703, 704, 705, 706, 707, 708 may be provided between the first lens 701 and the ninth lens 709. At least two lenses may be additionally provided between at least two of the first lens to the ninth lens 701, 702, 703, 704, 705, 706, 707, 708, 709.

[0521] The first lens 701 may have a negative (minus) diopter. The first lens 701 may have a convex meniscus shape on the object side. The first lens 701 may have an object-side surface S1 formed convexly. The first lens 701 may have an object-side surface S1 formed convexly with respect to the optical axis. The first lens 701 may have an upper-side surface S2 formed concavely. The first lens 701 may have an upper-side surface S2 formed concavely with respect to the optical axis. The first surface S1 of the first lens 701 may be arranged such that there are no critical points from the optical axis OA to the end of the effective area. The second surface S2 may be arranged such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0522] The radius of curvature of the object-side surface S1 of the first lens 701 may be positive. The radius of curvature of the object-side surface S1 of the first lens 701 on the optical axis may be positive. The radius of curvature of the upper-side surface S2 of the first lens 701 may be positive. The radius of curvature of the upper-side surface S2 of the first lens 701 along the optical axis may be positive. The absolute value of the radius of curvature of the object-side surface S1 of the first lens 701 may be greater than the absolute value of the radius of curvature of the upper-side surface S2 of the first lens 701. The first lens 701 may be a solid lens. The two surfaces of the first lens 701 may be formed as aspherical surfaces. One of the two surfaces of the first lens 701 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0523] The first lens 701 may satisfy the range of 1.5 < N1 < 1.6. In addition, the first lens 701 may satisfy the range of 1.52 < N1 < 1.58. N1 is the refractive index of the first lens 701. The first lens 701 may satisfy the range of 50 < V1 < 60. In addition, the first lens 701 may satisfy the range of 52 < V1 < 58. V1 is the Abbe number of the first lens 701.

[0524] The lens unit may include a second lens 702. The second lens 702 may be the second lens arranged starting from the object side. The second lens 702 may be the second lens adjacent to the object side. The second lens 702 may be arranged between the first lens 701 and the image side. The second lens 702 may be arranged between the first lens 701 and the third lens 703. An additional lens may be arranged between the second lens 702 and the first lens 701 or between the second lens 702 and the third lens 703. The second lens 702 may have a negative (minus) refractive power. The second lens 702 may have a convex meniscus shape on the object side. The second lens 702 may have an object-side surface S3 formed convexly. The second lens 702 may have an object-side surface S3 formed convexly with respect to the optical axis. The second lens 702 may have an upper-side surface S4 formed concavely. The second lens 702 may have an upper-side surface S4 formed concavely with respect to the optical axis. The third surface S3 of the second lens 702 may be arranged such that there is no critical point from the optical axis OA to the end of the effective area. The fourth surface S4 may be arranged such that there is no at least one critical point from the optical axis OA to the end of the effective area.

[0525] The radius of curvature of the object-side surface S3 of the second lens 702 may be a positive number. The radius of curvature of the object-side surface S3 of the second lens 702 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S4 of the second lens 702 may be a negative number. The radius of curvature of the upper-side surface S4 of the second lens 702 on the optical axis may be a negative number. The absolute value of the radius of curvature of the object-side surface S3 of the second lens 702 may be greater than the absolute value of the radius of curvature of the upper-side surface S4 of the second lens 702.

[0526] The second lens 702 may be a solid lens. The two surfaces of the second lens 702 may be formed as aspherical surfaces. One of the two surfaces of the second lens 702 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0527] The second lens 702 may satisfy the range of 1.6 < N2 < 1.7. In addition, the second lens 702 may satisfy the range of 1.62 < N2 < 1.65. N2 is the refractive index of the second lens 702. The second lens 702 may satisfy the range of 20 < V2 < 30. In addition, the second lens 702 may satisfy the range of 22 < V2 < 25. V2 is the Abbe number of the second lens 702.

[0528] The lens unit may include a third lens 703. The third lens 703 may be the third lens arranged starting from the object side. The third lens 703 may be the third lens adjacent to the object side. The third lens 703 may be arranged between the second lens 702 and the image side. The third lens 703 may be arranged between the second lens 702 and the fourth lens 704. An additional lens may be arranged between the third lens 703 and the second lens 702 or between the third lens 703 and the fourth lens 704.

[0529] The third lens 703 may have a positive (+) refractive power. The third lens 703 may be formed with two convex surfaces. The third lens 703 may be formed with a convex object-side surface S5. The third lens 703 may have an object-side surface S5 formed to protrude with respect to the optical axis. The third lens 703 may have an upper-side surface S6 formed to protrude. The third lens 703 may have an upper-side surface S6 formed to protrude with respect to the optical axis. The fifth surface S5 of the third lens 703 may be arranged such that there is no critical point from the optical axis OA to the end of the effective area. The sixth surface S6 may be arranged such that there is no at least one critical point from the optical axis OA to the end of the effective area.

[0530] The radius of curvature of the object-side surface S5 of the third lens 703 may be a positive number. The radius of curvature of the object-side surface S5 of the third lens 703 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S6 of the third lens 703 may be a negative number. The radius of curvature of the upper-side surface S6 of the third lens 703 along the optical axis may be a negative number. The absolute value of the radius of curvature of the object-side surface of the third lens 703 may be greater than the absolute value of the radius of curvature of the upper-side surface of the third lens 703. The third lens 703 may be a solid lens. The two surfaces of the third lens 703 may be formed as aspherical surfaces. One of the two surfaces of the third lens 703 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0531] The third lens 703 may satisfy the range of 1.5 < N3 < 1.6. In addition, the third lens 703 may satisfy the range of 1.52 < N3 < 1.58. N3 is the refractive index of the third lens 703. The third lens 703 may satisfy the range of 50 < V3 < 60. In addition, the third lens 703 may satisfy the range of 52 < V3 < 58. V3 is the Abbe number of the third lens 703.

[0532] The lens unit may include a fourth lens 704. The fourth lens 704 may be the fourth lens arranged starting from the object side. The fourth lens 704 may be the sixth lens arranged starting from the image side. The fourth lens 704 may be disposed between the third lens 703 and the image side. The fourth lens 704 may be disposed between the third lens 703 and the fifth lens 705. An additional lens may be disposed between the fourth lens 704 and the third lens 703 or between the fourth lens 704 and the fifth lens 705.

[0533] The fourth lens 704 may have a positive (+) refractive power. The fourth lens 704 may have a convex meniscus shape on the image side. The fourth lens 704 may have an object-side surface S7 formed in a concave manner. The fourth lens 704 may have an object-side surface S7 formed in a concave manner with respect to the optical axis. The fourth lens 704 may have an upper-side surface S8 formed in a convex manner. The fourth lens 704 may have an upper-side surface S8 formed in a convex manner with respect to the optical axis. The seventh surface S of the fourth lens 704 may be set such that there is no critical point from the optical axis OA to the end of the effective area. The eighth surface S8 may be set such that there is no at least one critical point from the optical axis OA to the end of the effective area.

[0534] The radius of curvature of the object-side surface S7 of the fourth lens 704 may be negative. The radius of curvature of the object-side surface S7 of the fourth lens 704 on the optical axis may be negative. The radius of curvature of the upper-side surface S8 of the fourth lens 704 may be negative. The radius of curvature of the upper-side surface S8 of the fourth lens 704 on the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface S7 of the fourth lens 704 may be greater than the absolute value of the radius of curvature of the upper-side surface S8 of the fourth lens 704. The fourth lens 704 may be a solid lens. The two surfaces of the fourth lens 704 may be formed as aspherical surfaces. One of the two surfaces of the fourth lens 704 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0535] The fourth lens 704 may satisfy the range of 1.5 < N4 < 1.6. In addition, the fourth lens 704 may satisfy the range of 1.52 < N4 < 1.58. N4 is the refractive index of the fourth lens 704. The fourth lens 704 may satisfy the range of 50 < V4 < 60. In addition, the fourth lens 704 may satisfy the range of 52 < V4 < 58. V4 is the Abbe number of the fourth lens 704.

[0536] The lens unit may include a fifth lens 705. The fifth lens 705 may be the fifth lens arranged starting from the object side. The fifth lens 705 may be the fifth lens arranged starting from the image side. The fifth lens 705 may be disposed between the fourth lens 704 and the image side. The fifth lens 705 may be disposed between the fourth lens 704 and the sixth lens 706. An additional lens may be disposed between the fifth lens 705 and the fourth lens 704 or between the fifth lens 705 and the sixth lens 706.

[0537] The fifth lens 705 may have a negative (minus) refractive power. The fifth lens 705 may have a convex meniscus shape on the object side. The fifth lens 705 may have an object-side surface S9 formed convexly. The fifth lens 705 may have an object-side surface S9 formed convexly with respect to the optical axis. The fifth lens 705 may have an upper-side surface S10 formed concavely. The fifth lens 705 may have an upper-side surface S10 formed concavely with respect to the optical axis. The ninth surface S9 of the fifth lens 705 may be set such that there is no critical point from the optical axis OA to the end of the effective area. The tenth surface S10 may be set such that there is no at least one critical point from the optical axis OA to the end of the effective area.

[0538] The radius of curvature of the object-side surface S9 of the fifth lens 705 may be a positive number. The radius of curvature of the object-side surface S9 of the fifth lens 705 on the optical axis may be a positive number. The radius of curvature of the upper-side surface S10 of the fifth lens 705 may be a positive number. The radius of curvature of the upper-side surface S10 of the fifth lens 705 along the optical axis may be a positive number. The absolute value of the radius of curvature of the object-side surface S9 of the fifth lens 705 may be greater than the absolute value of the radius of curvature of the upper-side surface S10 of the fifth lens 705. The fifth lens 705 may be a solid lens. The two surfaces of the fifth lens 705 may be formed as aspherical surfaces. One of the two surfaces of the fifth lens 705 may be formed as a spherical surface and the other surface may be formed as an aspherical surface.

[0539] The fifth lens 705 may satisfy the range of 1.6 < N5 < 1.7. In addition, the fifth lens 705 may satisfy the range of 1.62 < N5 < 1.65. N5 is the refractive index of the fifth lens 705. The fifth lens 705 may satisfy the range of 20 < V5 < 30. In addition, the fifth lens 705 may satisfy the range of 20 < V5 < 25. V5 is the Abbe number of the fifth lens 705.

[0540] The lens unit may include a sixth lens 706. The sixth lens 706 may be the sixth lens arranged starting from the object side. The sixth lens 706 may be the fourth lens arranged starting from the image side. The sixth lens 706 may be disposed between a fifth lens 705 and a seventh lens 707. The sixth lens 706 may be disposed between the fifth lens 705 and the image side. An additional lens may be disposed between the sixth lens 706 and the fifth lens 705 or between the sixth lens 706 and the seventh lens 707.

[0541] The sixth lens 706 may have a negative (minus) refractive power. The sixth lens 706 may have a convex meniscus shape on the image side. The sixth lens 706 may have an object-side surface S11 formed to be concave. The sixth lens 706 may have an object-side surface S11 concave with respect to the optical axis. The sixth lens 706 may have a convex upper surface S12. The sixth lens 706 may have an upper surface S12 convex with respect to the optical axis. The eleventh surface S11 of the sixth lens 706 may be set such that there is no critical point from the optical axis OA to the end of the effective region. The twelfth surface S12 may be set such that there is no at least one critical point from the optical axis OA to the end of the effective region.

[0542] The radius of curvature of the object-side surface S11 of the sixth lens 706 may be negative. The radius of curvature of the object-side surface S11 of the sixth lens 706 on the optical axis may be negative. The radius of curvature of the upper surface S12 of the sixth lens 706 may be negative. The radius of curvature of the upper surface S12 of the sixth lens 706 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the sixth lens 706 may be less than the absolute value of the radius of curvature of the upper surface of the sixth lens 706. The sixth lens 706 may be a solid lens. The two surfaces of the sixth lens 706 may be formed as aspherical surfaces. One of the two surfaces of the sixth lens 706 may be formed as a spherical surface and the other surface may be formed as an aspherical surface. The sixth lens 706 may have a surface including more than one inflection point.

[0543] The sixth lens 706 may satisfy the range of 1.6 < N6 < 1.7. In addition, the sixth lens 706 may satisfy the range of 1.62 < N6 < 1.65. N6 is the refractive index of the sixth lens 706. The sixth lens 706 may satisfy the range of 20 < V6 < 30. In addition, the sixth lens 706 may satisfy the range of 20 < V6 < 25. V6 is the Abbe number of the sixth lens 706.

[0544] The lens unit may include a seventh lens 707. The seventh lens 707 may be the seventh lens arranged starting from the object side. The seventh lens 707 may be the third lens arranged starting from the image side. The seventh lens 707 may be disposed between a sixth lens 706 and an eighth lens 708. The seventh lens 707 may be disposed between the sixth lens 706 and the image side. An additional lens may be disposed between the seventh lens 707 and the sixth lens 706 or between the seventh lens 707 and the eighth lens 708.

[0545] The seventh lens 707 may have a positive (+) refractive power. The seventh lens 707 may have a convex meniscus shape on the image side. The seventh lens 707 may have an object-side surface S13 formed recessedly. The seventh lens 707 may have an object-side surface S13 formed recessedly with respect to the optical axis. The seventh lens 707 may have an upper-side surface S14 formed convexly. The seventh lens 707 may have an upper-side surface S14 convex with respect to the optical axis. The object-side surface or the upper-side surface of the seventh lens 707 may include at least one inflection point.

[0546] The radius of curvature of the object-side surface S13 of the seventh lens 707 may be negative. The radius of curvature of the object-side surface S13 of the seventh lens 707 with respect to the optical axis may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 707 may be negative. The radius of curvature of the upper-side surface S14 of the seventh lens 707 along the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the seventh lens 707 may be greater than the absolute value of the radius of curvature of the upper-side surface of the seventh lens 707. The seventh lens 707 may be a solid lens. The two surfaces of the seventh lens 707 may be formed as aspherical surfaces. One of the two surfaces of the seventh lens 707 may be formed as a spherical surface and the other surface may be formed as an aspherical surface. The thirteenth surface S13 of the seventh lens 707 may be set to have no critical points from the optical axis OA to the end of the effective area. The fourteenth surface S14 may be set to have no less than one critical point from the optical axis OA to the end of the effective area.

[0547] The seventh lens 707 may satisfy the range of 1.5 < N7 < 1.6. In addition, the seventh lens 707 may satisfy the range of 1.52 < N7 < 1.58. N7 is the refractive index of the seventh lens 707. The seventh lens 707 may satisfy the range of 50 < V7 < 60. In addition, the seventh lens 707 may satisfy the range of 52 < V7 < 58. V6 is the Abbe number of the seventh lens 707.

[0548] The lens unit may include an eighth lens 708. The eighth lens 708 may be the eighth lens arranged starting from the object side. The eighth lens 708 may be the second lens arranged starting from the image side. The eighth lens 708 may be disposed between the seventh lens 707 and the ninth lens 709. The eighth lens 708 may be disposed between the seventh lens 707 and the image side. An additional lens may be disposed between the eighth lens 708 and the seventh lens 707 or between the eighth lens 708 and the ninth lens 709.

[0549] The eighth lens 708 may have a negative (minus) refractive power. The eighth lens 708 may have a convex meniscus shape on the image side. The eighth lens 708 may have an object-side surface S15 formed to be concave. The eighth lens 708 may have an object-side surface S15 formed to be concave with respect to the optical axis. The eighth lens 708 may have an upper-side surface S16 formed to be convex. The eighth lens 708 may have an upper-side surface S16 convex with respect to the optical axis. The object-side surface or the upper-side surface of the eighth lens 708 may include at least one inflection point.

[0550] The radius of curvature of the object-side surface S15 of the eighth lens 708 may be negative. The radius of curvature of the object-side surface S16 of the eighth lens 708 with respect to the optical axis may be negative. The radius of curvature of the upper-side surface S16 of the eighth lens 708 may be negative. The radius of curvature of the upper-side surface S16 of the eighth lens 708 along the optical axis may be negative. The value of the radius of curvature of the object-side surface of the eighth lens 708 may be greater than the value of the radius of curvature of the upper-side surface of the eighth lens 708. The eighth lens 708 may be a solid lens. The two surfaces of the eighth lens 708 may be formed as aspherical surfaces. One of the two surfaces of the eighth lens 708 may be formed as a spherical surface and the other surface may be formed as an aspherical surface. The fifteenth surface S15 of the eighth lens 708 may be arranged such that there are no critical points from the optical axis OA to the end of the effective area. The sixteenth surface S16 may be arranged such that there is at least one critical point from the optical axis OA to the end of the effective area.

[0551] The eighth lens 708 may satisfy the range of 1.5 < N8 < 1.6. In addition, the eighth lens 708 may satisfy the range of 1.52 < N8 < 1.58. N8 is the refractive index of the eighth lens 708. The eighth lens 708 may satisfy the range of 50 < V8 < 60. In addition, the eighth lens 708 may satisfy the range of 52 < V8 < 58. V8 is the Abbe number of the eighth lens 708.

[0552] The lens unit may include a ninth lens 709. The ninth lens 709 may be the lens closest to the image side. The ninth lens 709 may be disposed between the eighth lens 708 and the image side. An additional lens may be disposed between the ninth lens 709 and the eighth lens 708 or between the ninth lens 709 and the filter 900.

[0553] The ninth lens 709 may have a negative (minus) refractive power. The ninth lens 709 may have a meniscus shape convex toward the object side. The ninth lens 709 may have an object-side surface S17 formed convexly. The ninth lens 709 may have an object-side surface S17 formed convexly with respect to the optical axis. The ninth lens 709 may have an upper-side surface S18 formed concavely. The ninth lens 709 may have an upper-side surface S18 formed concavely with respect to the optical axis. The object-side surface or the upper-side surface of the ninth lens 709 may include at least one inflection point.

[0554] The object-side surface S17 and the upper-side surface S18 of the ninth lens 709 may have points with the same tilt angle in a region of 75% to 80% of the effective diameter. The object-side surface S17 and the upper-side surface S18 of the ninth lens 709 may have tangents parallel to each other at points in a region of 75% to 80% of the effective diameter. Thus, by making the specular reflection (diffuse reflection) path and the normal path the same, the occurrence of specular reflection (diffuse reflection) can be minimized.

[0555] The radius of curvature of the object-side surface S17 of the ninth lens 709 may be positive. The radius of curvature of the object-side surface S17 of the ninth lens 709 along the optical axis may be positive. The radius of curvature of the upper-side surface S18 of the ninth lens 709 may be positive. The radius of curvature of the upper-side surface S18 of the ninth lens 709 along the optical axis may be positive. The value of the radius of curvature of the object-side surface of the ninth lens 709 may be greater than the value of the radius of curvature of the upper-side surface of the ninth lens 709. The ninth lens 709 may be a solid lens. The two surfaces of the ninth lens 709 may be formed as aspherical surfaces. One of the two surfaces of the ninth lens 709 may be formed as a spherical surface and the other surface may be formed as an aspherical surface. The ninth lens 709 may have a surface including more than one inflection point.

[0556] The ninth lens 709 may satisfy the range of 1.5 < N9 < 1.6. In addition, the ninth lens 709 may satisfy the range of 1.52 < N9 < 1.58. N9 is the refractive index of the ninth lens 709. The ninth lens 709 may satisfy the range of 50 < V9 < 60. In addition, the ninth lens 709 may satisfy the range of 52 < V9 < 58. V9 is the Abbe number of the ninth lens 709.

[0557] The seventeenth surface S17 of the ninth lens 709 may be set such that there is no critical point from the optical axis OA to the end of the effective area. The eighteenth surface S18 of the ninth lens 709 may have a critical point from the optical axis OA to the end of the effective area. When the eighteenth surface S18 has a critical point, the critical point may be within the range of 60% to 68%, preferably within the range of 63% to 67% of the effective radius r92 from the optical axis OA. The critical point of the eighteenth surface S18 may be within the range of 4.5 mm to 5 mm from the optical axis OA, preferably within the range of 4.6 mm to 4.8 mm.

[0558] The lens unit may include an aperture STOP. The aperture may control the amount of light entering the optical system. For a lens disposed between the object and the aperture, the effective diameter of the lens surface tends to increase from the object to the aperture. For a lens surface disposed between the aperture and the sensor, the effective diameter of the lens surface has a tendency to decrease from the aperture to the sensor side. The fact that the effective diameter of the lens surface has a tendency to increase or decrease does not mean that the effective diameter of the lens surface only increases or decreases. For example, this also includes the case where the effective diameter of the lens surface increases from the aperture to the sensor side and then decreases.

[0559] The aperture STOP may be disposed between the third lens 703 and the fourth lens 704. The aperture STOP may be set to be closer to the fourth lens 704 than to the third lens 703. The aperture STOP may be spaced apart from the object-side surface of the third lens 703. The aperture STOP may adjust the amount of light entering from the subject. The aperture STOP may adjust the amount of light passing through the third lens 703. The aperture STOP may adjust the amount of light entering the fourth lens 704. The aperture STOP may include an aperture diaphragm.

[0560] The optical system or the camera module may include a filter 900. The filter 900 may be disposed between the lens closest to the sensor side among the lenses of the lens unit 100 and the image sensor 800. For example, the filter 900 may be disposed between the nth lens and the image sensor 800.

[0561] A cover glass may be disposed between the filter 900 and the image sensor 800 to protect the upper part of the image sensor 800 and prevent a reduction in the reliability of the image sensor 800. The cover glass may be removed. The cover glass may be a protective glass.

[0562] The filter 900 may include an infrared filter or an infrared cut-off filter. The filter 900 may transmit light within a set wavelength band and filter out light in other wavelength bands. When the filter 900 includes an infrared filter, it may block the transfer of radiant heat emitted from external light to the image sensor 800. In addition, the filter 900 may transmit visible light and reflect infrared light.

[0563]

Table 14

[0564]

[0565]

[0566] Table 14 shows the surface number (surface), radius of curvature (radius), center thickness of each lens or distance between lens surfaces (thickness), refractive index (nd), Abbe number (vd), effective radius (semi-aperture), and focal length of the lens according to the seventh embodiment of the present invention. Here, the unit of the radius of curvature and the thickness or distance can be mm.

[0567]

Table 15

[0568] Seventh Embodiment Seventh Embodiment TTL 13.9395 ET1 0.3616 SD(Stop~L9S2) 9.8794 ET2 1.0926 TD(L1S1~L9S2) 13.1196 ET3 0.5754 F 8.1437 ET4 0.6722 F_LG1 16.4521 ET5 1.0068 F_LG2 20.7022 ET6 0.5282 ​ 2.2876 ​ 0.3732 ​ 8.1715 ​ 0.4705 ​ 37.6800 ​ 2.1924 ​ 3.5600 ​ 2.2188

[0569] Table 15 shows the characteristics of the imaging lens according to the seventh embodiment of the present invention.

[0570] TTL refers to the optical axis distance from the vertex of the object-side surface of the first lens 701 to the image surface, SD refers to the optical axis distance from the aperture STOP to the upper surface of the ninth lens 709, TD represents the optical axis distance from the vertex of the object-side surface of the first lens 701 to the upper surface of the ninth lens 709, F represents the total focal length, F_LG1 represents the combined focal length of the first lens 701 to the third lens 703 in the object-side direction of the aperture STOP, F_LG2 represents the combined focal length of the fourth lens 704 to the ninth lens 709 in the image-side direction of the aperture STOP, Fno represents the ratio of the focal length of the lens to the effective diameter, ImgH represents the distance from the optical axis OA to the diagonal end of the image sensor 800 or half of the maximum diagonal length, HFOV represents the diagonal field of view of the optical system, EPD represents the diameter of the entrance pupil (effective aperture), BFL represents the optical axis distance from the upper surface of the ninth lens 709 to the image surface, and ET1 to ET9 represent the thickness of the edge region of each lens.

[0571] The optical systems according to the fifth to seventh embodiments described above can satisfy at least one or more of the following mathematical equations. Thus, the optical systems according to the fifth to seventh embodiments can have improved optical characteristics. For example, if the optical system according to this embodiment satisfies at least one of the mathematical equations, the optical system can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the central part of the field of view (FOV) but also in the peripheral part. In addition, the optical systems according to the fifth to seventh embodiments can have improved resolution. In addition, the thickness of the lens on the optical axis OA and the interval (pitch) between adjacent lenses on the optical axis OA as described in the mathematical equations can be referred to the embodiments disclosed above.

[0572] [Equation 21]

[0573] 0.5 < F / TTL < 1.5

[0574] Equation 21 can be able to set the total focal length (F) and the total optical axis length (TTL) of the optical system. This can provide a mobile optical system. If the optical system according to the fifth to seventh embodiments satisfies Equation 21, the optical system can have an appropriate focal length within the set TTL range. If the value is lower than the lower limit of Equation 21, it is necessary to increase the diopter of the lens, which makes it difficult to correct spherical aberration or distortion aberration. If the value exceeds the upper limit of Equation 21, the effective diameter or TTL of the lens may become longer, which may lead to the enlargement of the imaging lens system. In the fifth to seventh embodiments, Equation 21 is preferably satisfied: 0.5 < TTL / F < 0.7.

[0575] [Equation 22]

[0576] 1 < F / EPD < 3

[0577] Equation 22 can be able to set the total focal length (F) and the size (EPD) of the entrance pupil of the optical system. Therefore, the total brightness of the optical system can be controlled. In the fifth to seventh embodiments, Equation 22 is preferably satisfied: 2 < F / EPD < 2.5.

[0578] [Equation 23]

[0579] 2 < ET9 / CT9 < 5

[0580] Mathematical equation 23 can establish the relationship between the edge thickness (ET9) and the center thickness (CT9) of the ninth lenses 509, 609, and 709. Therefore, the distortion characteristics of the optical system can be improved, and the conditions for image processing can be set. In the fifth to seventh embodiments, mathematical equation 23 can preferably satisfy the conditional expression: 2 < ET9 / CT9 < 3.5.

[0581] [Mathematical equation 24]

[0582] 0.5 < CT8 / ET8 < 1.5

[0583] Mathematical equation 24 can set the relationship between the edge thickness (ET8) and the center thickness (CT8) of the eighth lenses 508, 608, and 708. Therefore, the distortion characteristics of the optical system can be improved, and the conditions for image processing can be set. In the fifth to seventh embodiments, mathematical equation 24 can preferably satisfy 0.7 < CT8 / ET8 < 1.3.

[0584] [Mathematical equation 25]

[0585] 1 < CT_Max / Air_Max < 1.5

[0586] Mathematical equation 25 can establish the relationship between the maximum center thickness (CT_Max) of the first to ninth lenses and the maximum distance (Air_Max) between adjacent lenses. Therefore, the optical system can achieve good optical performance at the focal length corresponding to the set field of view and reduce the TTL, enabling the camera module to be miniaturized. In the fifth to seventh embodiments, mathematical equation 25 can preferably satisfy the conditional expression: 1 < CT_Max / Air_Max < 1.2.

[0587] [Mathematical equation 26]

[0588] 0 < F / |L1R1| < 0.5

[0589] In mathematical equation 26, the effective focal length of the optical system and the radius of curvature of the object-side surface S1 of the first lens 501, 601, and 701 are set, so as to be able to control the influence on the incident light and the TTL. In the fifth to seventh embodiments, mathematical equation 26 can preferably satisfy the conditional expression: 0 < F / |L1R1| < 0.3.

[0590] [Mathematical equation 27]

[0591] 10 < ∑Index < 20

[0592] In mathematical equation 27, ∑Index represents the sum of the refractive indices of each of the multiple lenses on the d-line. When mathematical equation 27 is satisfied, the TTL in an optical system combining an aspherical lens and a spherical lens can be controlled, thereby achieving improved resolution. Mathematical equation 27 can preferably satisfy 13 < ∑Index < 15.

[0593] [Mathematical equation 28]

[0594] 20 < ∑Abb / ∑Index < 30

[0595] Mathematical equation 28 can establish the relationship between the sum of the Abbe numbers (∑Abb) of each lens and the sum of the refractive indices of each lens on the d-line (∑Index). When mathematical equation 28 is satisfied, the optical system can achieve improved aberration characteristics and resolution. Mathematical equation 28 can set the sum of the Abbe numbers of the lenses and the sum of the refractive indices, enabling the control of optical characteristics. Ideally, the conditional expression 25 < ∑Abb / ∑Index < 29 should be satisfied.

[0596] [Mathematical equation 29]

[0597] 1 < Distortion < 2.5

[0598] In mathematical equation 29, Distortion refers to the maximum value or absolute value of the distortion from the center (0.0F) of the image sensor to the end point (1.0F) in the diagonal direction based on the optical characteristics detected by the image sensor 800. If the optical system satisfies mathematical equation 29, the optical system can improve its distortion characteristics and set conditions for image processing. Preferably, 1.5 < Distortion < 2.2 should be satisfied.

[0599] [Mathematical equation 30]

[0600] 0 < CT1 / CT2 < 1

[0601] In mathematical equation 30, CT1 represents the thickness of the first lenses 501, 601, 701, 401 on the optical axis OA, and CT2 represents the thickness (mm) of the second lenses 502, 602, 702, 401 on the optical axis OA. Mathematical equation 30 can establish the relationship between the center thicknesses of the first and second lenses, thereby enabling the improvement of chromatic aberration in the optical system. In addition, it can set the center thickness of the first aspherical lenses 501, 601, 701, 401, thereby enhancing the optical performance of both the central region and the peripheral region of the field of view (FOV). In the fifth to seventh embodiments, mathematical equation 30 can satisfy the conditional expression: 0.2 < CT1 / CT2 < 0.5.

[0602] [Mathematical equation 31]

[0603] Fno < 2.5

[0604] Mathematical equation 31 can be used to set the range of Fno. When the optical system according to the fifth to seventh embodiments satisfies Mathematical equation 31, the optical system can provide a bright image and effectively ensure the characteristics of a large aperture to highlight the subject. In the fifth to seventh embodiments, Mathematical equation 31 can preferably satisfy 2 < Fno < 2.4.

[0605] [Mathematical equation 32]

[0606] 0.5 < TTL / ImgH * 2 < 1

[0607] Mathematical equation 32 can be capable of setting the total optical axis length (TTL) of the optical system and the length (ImgH) in the diagonal direction starting from the optical axis of the image sensor. When the optical system according to the fifth to seventh embodiments satisfies Mathematical equation 32, the optical system can have a TTL suitable for the image sensor, thereby providing improved image quality. In addition, the ultra-thin characteristics of the camera lens group can be effectively realized. In the fifth to seventh embodiments, Mathematical equation 32 can preferably satisfy 0.7 < TTL / ImgH < 0.9.

[0608] [Mathematical equation 33]

[0609] 10 < TTL < 15

[0610] Mathematical equation 33 can set the range of TTL, which is the distance from the center of the first surface S1 of the first lenses 501, 601, 701 to the optical axis OA of the image sensor. Mathematical equation 33 can provide a compact movable optical system. In the fifth to seventh embodiments, Mathematical equation 33 can preferably satisfy the conditional expression: 12 < TTL < 14.

[0611] [Mathematical equation 34]

[0612] 0 < |F9 / F1| < 0.2

[0613] Mathematical equation 34 can establish the relationship between the focal lengths of the first lenses 501, 601, 701 and the ninth lenses 509, 609, 709 in the optical system. When the optical system according to the fifth to seventh embodiments satisfies Mathematical equation 34, the diopters of the first lens and the ninth lens of the optical system can be controlled to improve the resolution and affect the TTL and the effective focal length (F). In the fifth to seventh embodiments, Mathematical equation 34 can preferably satisfy 0 < |F9 / F1| < 0.1.

[0614] [Mathematical equation 35]

[0615] 0 < CT8 / CT9 < 1.5

[0616] In mathematical equation 35, CT8 represents the thickness of the eighth lenses 508, 608, 708 on the optical axis OA, and CT9 represents the thickness of the ninth lenses 509, 609, 709 on the optical axis OA. The mathematical equation 35 establishes the relationship between the center thicknesses of the eighth and ninth lenses, and can control the factors affecting aberration. In the fifth to seventh embodiments, the mathematical equation 35 can preferably satisfy the conditional expression 0 < CT8 / CT9 < 1.

[0617] [Mathematical equation 36]

[0618] 1 < ∑CT / ∑CG < 2

[0619] In mathematical equation 36, ∑CT is the sum of the center thicknesses of the lenses, and ∑CG is the sum of the distances between adjacent lenses. When the mathematical equation 36 is satisfied, the optical system can achieve good optical performance at the focal length within the specified field of view and reduce the TTL. Preferably, the fifth to seventh embodiments can satisfy 1.5 < ∑CT / ∑CG < 2.

[0620] [Mathematical equation 37]

[0621] FOV > 75

[0622] Mathematical equation 37 can set the range (degrees) of the field of view in the diagonal direction of the optical system. If the optical system according to the fifth to seventh embodiments satisfies the mathematical equation 37, the optical system can provide a mobile optical system with a field of view of more than 70 degrees. In the fifth to seventh embodiments, the mathematical equation 37 can preferably satisfy 75 < FOV < 80.

[0623] [Mathematical equation 38]

[0624] 0 < F / ImgH < 1

[0625] Mathematical equation 38 can be able to set the total effective focal length (F) of the optical system and the length (ImgH) of the image sensor in the diagonal direction on the optical axis. Such an optical system can have improved aberration characteristics at the size of the mobile image sensor. In the fifth to seventh embodiments, the mathematical equation 38 can preferably satisfy 0.8 < F / ImgH < 1.

[0626] [Mathematical equation 39]

[0627] 30 < FOV / Fno < 40

[0628] Mathematical equation 39 can establish the relationship between the diagonal field of view and the Fno of the optical system. In the fifth to seventh embodiments, mathematical equation 39 preferably satisfies 32 < FOV / Fno < 35. Here, Fno is set to be less than 2.4 to provide a bright image.

[0629] [Mathematical equation 40]

[0630] 0 < BFL / TD < 0.3

[0631] Mathematical equation 40 can establish the relationship between the back focal length (BFL) and the optical axis distance (TD) of the lens in the optical system. This can maintain the resolution of the optical system while controlling the overall size of the optical system. In the fifth to seventh embodiments, mathematical equation 40 preferably satisfies the conditional expression: 0 < BFL / TD < 0.2. When the conditional value of BFL / TD is 0.2 or more, the BFL is designed to be significantly larger than the TD, resulting in an increase in the overall size of the optical system. This makes it difficult to miniaturize the optical system and increases the distance between the ninth lenses 509, 609, 709 and the image sensor. This may cause an increase in unnecessary light passing through the space between the ninth lenses 509, 609, 709 and the image sensor, which may lead to a decline in aberration characteristics and a reduction in resolution.

[0632] [Mathematical equation 41]

[0633] 0.2 < CT1 < 0.4

[0634] Mathematical equation 41 can establish the relationship between the center thickness (CT1) of the first lenses 501, 601, 701 and the optical axis. If this value is below the lower limit of mathematical equation 41, mass production of the actual lens becomes difficult, resulting in poor manufacturability. If this value exceeds the upper limit of mathematical equation 42, the TTL of the optical system becomes longer, which may cause the imaging lens system to become larger. In the fifth to seventh embodiments, mathematical equation 41 preferably satisfies the conditional expression: 0.3 < CT1 < 0.4.

[0635] [Mathematical equation 42]

[0636] 0.2 < CT6 < 0.4

[0637] Mathematical equation 42 can be used to set the relationship between the central thicknesses (CT6) of the sixth lenses 506, 606, 706 on the optical axis. If this value is below the lower limit of mathematical equation 42, mass production of the actual lens becomes difficult, resulting in poor manufacturability. If this value exceeds the upper limit of mathematical equation 42, the TTL of the optical system becomes longer, which may cause the imaging lens system to become larger. In the fifth to seventh embodiments, mathematical equation 42 preferably satisfies the conditional expression: 0.3 < CT6 < 0.4.

[0638] [Mathematical equation 43]

[0639] 0 < |F_LG1 - F_LG2| < 10

[0640] Mathematical equation 43 can establish the relationship between the combined focal length (F_LG1) of the first to third lenses on the object side of the aperture STOP and the combined focal length (F_LG2) of the fourth to ninth lenses on the image side of the aperture STOP. If mathematical equation 43 is not satisfied, the diopter balance between the first lens group on the object side of the aperture STOP and the second lens group on the image side of the aperture STOP is inconsistent, resulting in errors during tolerance analysis and possibly leading to a low yield. In the fifth to seventh embodiments, mathematical equation 43 preferably satisfies the conditional expression 3 < |F_LG1 - F_LG2| < 7.

[0641] [Mathematical equation 44]

[0642] 0.3 < CA_L3 / ImgH < 0.5

[0643] In mathematical equation 44, CA_L3 is the effective focal length of the third lenses 503, 603, 703, and ImgH is the length (ImgH) of the image sensor in the diagonal direction on the optical axis. When mathematical equation 44 is satisfied, the optical path entering the optical system can be controlled, and good optical performance can be achieved at the set field of view and focal length. Preferably, the fifth to seventh embodiments can satisfy the conditional expression: 0.4 < CA_L3 / ImgH < 0.5.

[0644] [Mathematical equation 45]

[0645] 0.3 < CA_L1 / CA_L9 < 0.5

[0646] In mathematical equation 45, CA_L1 is the effective diameter dimension of the first lenses 501, 601, 701, and CA_L9 is the effective diameter dimension of the ninth lenses 509, 609, 709. When mathematical equation 45 is satisfied, the optical paths of the light entering the optical system and the light leaving the image sensor can be controlled, and the optical system can achieve good optical performance at the set field of view and focal length. Preferably, the fifth to seventh embodiments can satisfy 0.35 < CA_L1 / CA_L9 < 0.45.

[0647] [Mathematical equation 46]

[0648] 0.1 < CA_L3 / CA_L9 < 0.4

[0649] In mathematical equation 46, CA_L3 is the effective diameter dimension of the third lenses 503, 603, 703, and CA_L9 is the effective diameter dimension of the ninth lenses 509, 609, 709. When mathematical equation 45 is satisfied, the optical paths of the light entering the optical system and the light leaving the image sensor can be controlled, and the optical system can achieve good optical performance at the set field of view and focal length. Preferably, the fifth to seventh embodiments can satisfy 0.2 < CA_L3 / CA_L9 < 0.35.

[0650] [Mathematical equation 47]

[0651] 0.3 < CA_LG1_AVG / CA_LG2_AVG < 0.7

[0652] In mathematical equation 47, CA_LG1_AVG is the average effective diameter dimension of the first lens group LG1, and CA_LG2_AVG is the average effective diameter dimension of the second lens group LG2. When mathematical equation 47 is satisfied, the optical paths of the light entering the optical system and the light leaving the image sensor can be effectively controlled, such that the optical system can achieve good optical performance at the set field of view and focal length. Preferably, the fifth to seventh embodiments can satisfy the conditional expression 0.5 < CA_LG1_AVG / CA_LG2_AVG < 0.6.

[0653] [Mathematical equation 48]

[0654] 50% < CP_L9S18 < 70%

[0655] In mathematical equation 48, CP_L9S18 is the point within the effective radius where the critical point of the eighteenth surface S18 on the sensor side of the ninth lenses 509, 609, 709 is located. When mathematical equation 48 is satisfied, various aberrations occurring in the optical system can be corrected. Preferably, the fifth to seventh embodiments can satisfy the conditional expression 53% < CP_L9S18 < 67%.

[0656] [Mathematical equation 49]

[0657]

[0658] In mathematical equation 49, Z, i.e., the sag, can represent the distance in the optical axis direction from an arbitrary position on the aspherical surface to the vertex of the aspherical surface. Y can represent the distance perpendicular to the optical axis from an arbitrary point on the aspherical surface to the optical axis. c can represent the curvature of the lens, and K can represent the conic constant. In addition, A, B, C, D, E, and F can represent aspherical constants.

[0659] Table 16 shows the results of the above mathematical equations 21 to 48 in the optical system of the embodiment. Referring to Table 16, it can be seen that the optical system satisfies at least one, two, or three of mathematical equations 21 to 48. Specifically, the optical system according to the embodiment satisfies all of mathematical equations 21 to 48. Therefore, the optical system can have good optical performance and excellent optical characteristics both in the central region and the peripheral region of the field of view (FOV).

[0660]

Table 16

[0661]

[0662]

[0663] Hereinafter, a camera module according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0664] ​ is an exploded perspective view of a camera device according to an embodiment of the present invention.

[0665] The camera device 10A may include a camera module.

[0666] The camera device 10A may include a lens module 20. The lens module 20 may include at least one lens. The lens may be disposed at a position corresponding to the image sensor 800. The lens module 20 may include a lens and a barrel. The lens module 20 may be coupled to the barrel 210 of the lens driving device 10B. The lens module 20 may be coupled to the barrel 210 by screw coupling and / or adhesive bonding. The lens module 20 may move integrally with the barrel 210.

[0667] The camera device 10A may include a filter 900. The filter 900 may be used to block light in a specific frequency band from passing through the lens module 20 and entering the image sensor 800. The filter 900 may be disposed parallel to the x-y plane. The filter 900 may be disposed between the lens module 20 and the image sensor 800. The filter 900 may be disposed on the sensor base 40. As a variant, the filter 900 may be disposed on the base of the lens driving device 10B. The filter 900 may include an infrared filter. The infrared filter may block infrared light from entering the image sensor 800.

[0668] The camera device 10A may include a sensor base 40. The sensor base 40 may be disposed between the lens driving device 10B and the printed circuit board 50. The sensor base 40 may include a protrusion 41 on which the filter 900 is disposed. An opening may be formed in a portion of the sensor base 40 where the filter 900 is disposed to allow light passing through the filter 900 to enter the image sensor 800. An adhesive member 45 may be used to bond or adhere the base 410 of the lens driving device 10B to the sensor base 40. The adhesive member 45 may also be used to prevent foreign matter from entering the interior of the lens driving device 10B. The adhesive member 45 may include one or more of epoxy resin, thermosetting adhesive, and ultraviolet light-curable adhesive.

[0669] The camera device 10A may include a printed circuit board 50 (PCB). The printed circuit board 50 may be a substrate or a circuit board. The lens driving device 10B may be disposed on the printed circuit board 50. The sensor base 40 may be disposed between the printed circuit board 50 and the lens driving device 10B. The printed circuit board 50 may be electrically connected to the lens driving device 10B. The image sensor 800 may be disposed on the printed circuit board 50. The printed circuit board 50 may be equipped with various circuits, components, and controllers to convert an image formed on the image sensor 800 into an electrical signal and transmit it to an external device.

[0670] The camera device 10A may include an image sensor 800. The image sensor 800 may be configured such that light passing through a lens and a filter 900 is incident and forms an image. The image sensor 800 may be mounted on a printed circuit board 50. The image sensor 800 may be electrically connected to the printed circuit board 50. For example, the image sensor 800 may be joined to the printed circuit board 50 using surface mount technology (SMT). In another example, the image sensor 800 may be joined to the printed circuit board 50 using flip chip technology. The image sensor 800 may be arranged such that its optical axis is aligned with the optical axis of the lens. In other words, the optical axis of the image sensor 800 and the optical axis of the lens may be aligned. The image sensor 800 is capable of converting light incident on an effective image area of the image sensor 800 into an electrical signal. The image sensor 800 may be any one of a CCD (charge-coupled device), MOS (metal-oxide semiconductor), CPD, or CID.

[0671] The camera device 10A may include a motion sensor 70. The motion sensor 70 may be mounted on the printed circuit board 50. The motion sensor 70 may be electrically connected to a controller 80 through a circuit pattern provided on the printed circuit board 50. The motion sensor 70 may output rotational angular velocity information based on the motion of the camera device 10A. The motion sensor 70 may include a biaxial or triaxial gyro sensor or an angular velocity sensor.

[0672] The camera device 10A may include a controller 80. The controller 80 may be provided on the printed circuit board 50. The controller 80 may be electrically connected to the AF coil and the OIS coil of the lens driving device 10B. The controller 80 may independently control the direction, intensity, and amplitude of the current supplied to the AF coil and the OIS coil. The controller 80 may control the lens driving device 10B to perform an autofocus function and / or an image stabilization function. In addition, the controller 80 may perform autofocus feedback control and / or image stabilization feedback control on the lens driving device 10B.

[0673] The camera device 10A may include a connector 90. The connector 90 may be electrically connected to the printed circuit board 50. The connector 90 may include a port for electrically connecting to an external device.

[0674] A modification example according to this embodiment may include some configurations of the embodiment described with reference to ​ and some configurations of the embodiment described with reference to ​ That is, the modification example may include the embodiment described with reference to ​ but may omit some configurations of the embodiment described with reference to ​ and include some configurations of the embodiment described with reference to ​ Alternatively, the modification example may omit the reference​ Some configurations of the described embodiments and include reference to the corresponding ​ Some configurations of the described embodiments. The features, structures, and effects described in the above embodiments are included in at least one embodiment and do not have to be limited to a single embodiment. In addition, those skilled in the art can combine or modify the features, structures, and effects shown in each embodiment into other embodiments. Therefore, the content related to such combinations and modifications should be construed as falling within the scope of the embodiments.

Claims

1. An optical system, sequentially including from the object side to the image side: The first lens, the first lens having a negative (-) diopter; The second lens, the second lens having a negative (-) diopter; The third lens, the third lens having a positive (+) diopter; the fourth lens, the fourth lens having a positive (+) diopter; the fifth lens; the sixth lens; the seventh lens, the seventh lens having a positive (+) diopter; the eighth lens; and the ninth lens.

2. The optical system according to claim 1, wherein, Among the first lens to the ninth lens, the first lens has the smallest thickness along the optical axis.

3. The optical system according to claim 1, wherein, Among the first lens to the seventh lens, the first lens has the largest absolute value of the focal length.

4. The optical system according to claim 1, wherein, The thickness of the first lens along the optical axis is less than the thickness of the second lens along the optical axis.

5. The optical system according to claim 1, wherein, The thickness of the sixth lens on the optical axis is less than the thickness of the seventh lens on the optical axis.

6. The optical system according to claim 1, wherein, The distance on the optical axis between the fifth lens and the sixth lens is greater than the distance on the optical axis between the eighth lens and the ninth lens.

7. The optical system according to claim 1, wherein, The fifth lens and the sixth lens have a negative (-) diopter, and the eighth lens and the ninth lens have a negative (-) diopter.

8. The optical system according to claim 1, further comprising: The first lens group, the first lens group including the first lens to the third lens; And the second lens group, the second lens group including the fourth lens to the ninth lens, wherein the focal length of the first lens group is shorter than the focal length of the second lens group.

9. The optical system according to claim 8, wherein, The absolute value of the difference between the focal length of the first lens group and the focal length of the second lens group satisfies the condition of 0 or more and 10 or less.

10. The optical system according to any one of claims 1 to 9, satisfying the following conditional formula: <Conditional formula> 0.5 < TTL / ImgH*2 < 1 In the above conditional formula, TTL represents the distance on the optical axis from the object-side surface of the first lens to the image sensor, and ImgH represents the length of the image sensor in the diagonal direction on the optical axis.

Images