Optical system and camera module

Abstract

An optical system according to an embodiment of the present invention includes first to seventh lenses arranged along the optical axis. The first lens has positive (+) refractive power, the second lens has negative (-) refractive power, the fifth lens has negative (-) refractive power, the sixth lens has positive (+) refractive power, the seventh lens has negative (-) refractive power, and on the optical axis, the distance between the first lens and the second lens is greater than the distance between the third lens and the fourth lens.

Description

Optical system and camera module

[0001] The present invention relates to an optical system for improved optical performance and a camera module including the same.

[0002] Recently, research has been focused on image pickup systems (IPS), including camera modules for communication terminals, digital still cameras (DSCs), camcorders, and PC cameras (image capture devices attached to personal computers). One of the most crucial components for camera modules in these IPS systems to capture images is the imaging lens, which forms the image.

[0003] Portable devices, such as mobile phones and car cameras, are increasingly becoming smaller and / or lighter. In line with this trend, imaging lenses are also becoming smaller. Furthermore, along with smaller imaging lenses, the increasing performance of photodetectors is driving the demand for higher-performance imaging lenses.

[0004] The present invention seeks to provide a photographic lens capable of wide-angle photography.

[0005] Additionally, we aim to provide a compact imaging lens suitable for high resolution.

[0006] In addition, it is intended to provide an imaging lens having excellent aberration characteristics and good aberration correction capability.

[0007] In order to solve the above technical problem, an optical system according to an embodiment of the present invention includes first to seventh lenses arranged along an optical axis, wherein the first lens has positive (+) refractive power, the second lens has negative (-) refractive power, the fifth lens has negative (-) refractive power, the sixth lens has positive (+) refractive power, and the seventh lens has negative (-) refractive power, and a distance between the first lens and the second lens on the optical axis is greater than a distance between the third lens and the fourth lens.

[0008] The thickness of the first lens on the optical axis may be greater than the distance between the sixth lens and the seventh lens.

[0009] The third lens may have a convex meniscus shape toward the sensor.

[0010] The above fourth lens may have a meniscus shape convex toward the object side.

[0011] The sign of the curvature radius of the sensor side of the first lens and the sign of the curvature radius of the object side of the second lens may be the same.

[0012] The third lens may have positive (+) refractive power, and the fourth lens may have negative (-) refractive power.

[0013] The following condition can be satisfied. <Condition> 5 < TTL < 10 (In the above condition, TTL means the distance from the object side of the first lens to the upper surface of the image sensor on the optical axis.)

[0014] The following condition can be satisfied. <Condition> 0.1 < ΣCG / ΣCT < 1 (In the above condition, ΣCT is the sum of the central thicknesses of the lenses, and ΣCG is the sum of the spacings between adjacent lenses.)

[0015] In order to solve the above technical problem, an optical system according to an embodiment of the present invention includes first to seventh lenses arranged along an optical axis, wherein the first lens has positive (+) refractive power, the second lens has negative (-) refractive power, the third lens has positive (+) refractive power, and a thickness of the first lens on the optical axis is greater than a distance between the sixth lens and the seventh lens.

[0016] The sign of the curvature radius of the sensor side of the first lens and the sign of the curvature radius of the object side of the second lens may be the same.

[0017] The above fourth lens may have a meniscus shape convex toward the object side.

[0018] The third lens may have a convex meniscus shape toward the sensor.

[0019] The following condition can be satisfied. <Condition> 0.1 < CG1 / ΣCG < 0.2 (In the above condition, CG1 is the center spacing between the first lens and the second lens, and ΣCG is the sum of the spacings between adjacent lenses.)

[0020] The following condition can be satisfied. <Condition> 2 < CT1 / CG1 < 4 (In the above condition, CT1 is the central thickness of the first lens, and CG1 is the central gap between the first lens and the second lens.)

[0021] The following condition can be satisfied. <Condition> 0.1 < TTL / ImgH < 1 (In the above condition, TTL means the distance from the object side of the first lens to the upper surface of the image sensor on the optical axis, and ImgH means the maximum diagonal length of the image sensor.)

[0022] An optical system and camera module according to an embodiment may have improved optical characteristics. Specifically, in the optical system according to an embodiment, a plurality of lenses may have set thicknesses, refractive powers, and spacings from adjacent lenses. Accordingly, the optical system and camera module according to the embodiment may have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set field of view range, and may have good optical performance in the periphery of the field of view.

[0023] Additionally, the optical system and camera module according to the embodiment can satisfy the set angle of view and exhibit excellent optical characteristics. This allows the optical system to provide a slimmer camera module. Accordingly, the optical system and camera module can be used in various applications and devices.

[0024] FIG. 1 is a side cross-sectional view of an optical system and a camera module having the same according to a first embodiment.

[0025] Figure 2 is a table showing the aspherical coefficients of lenses in the optical system of Figure 1.

[0026] Fig. 3 is a table showing the Sag values ​​of the lens surfaces of the first to seventh lenses in the optical system of Fig. 1.

[0027] Figure 4 is a table showing the thickness of lenses and the spacing between lenses in the direction perpendicular to the optical axis in the optical system of Figure 1.

[0028] Fig. 5 is a table showing the slope angles of the lens surfaces of the first to eighth lenses in the optical system of Fig. 1.

[0029] Figure 6 is a graph showing data on the diffraction MTF (Modulation Transfer Function) of the optical system of Figure 1.

[0030] Fig. 7 is a graph showing data on the aberration characteristics of the optical system of Fig. 1.

[0031] Fig. 8 is a side cross-sectional view of an optical system and a camera module having the same according to a second embodiment.

[0032] Fig. 9 is a table showing the aspherical coefficients of lenses in the optical system of Fig. 8.

[0033] Fig. 10 is a table showing the Sag values ​​of the lens surfaces of the first to seventh lenses in the optical system of Fig. 8.

[0034] Figure 11 is a table showing the thickness of lenses and the spacing between lenses in the direction perpendicular to the optical axis in the optical system of Figure 8.

[0035] Fig. 12 is a table showing the slope angles of the lens surfaces of the first to seventh lenses in the optical system of Fig. 8.

[0036] Figure 13 is a graph showing data on the diffraction MTF (Modulation Transfer Function) of the optical system of Figure 8.

[0037] Fig. 14 is a graph showing data on the aberration characteristics of the optical system of Fig. 8.

[0038] Figure 15 is an exploded perspective view of a camera module according to the present embodiment.

[0039] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0040] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0041] In addition, terms (including technical and scientific terms) used in this embodiment may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which this embodiment belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0042] Additionally, the terms used in this embodiment are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0043] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0044] Additionally, in describing the components of this embodiment, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and are not intended to limit the nature, order, or sequence of the components.

[0045] And, when a component is described as being 'connected', 'coupled', or 'connected' to another component, it may include not only cases where the component is 'connected', 'coupled', or 'connected' directly to the other component, but also cases where the component is 'connected', 'coupled', or 'connected' by another component between the component and the other component.

[0046] Additionally, when described as being formed or arranged "above" or "below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below," the meaning may include not only the upward direction but also the downward direction based on one component.

[0047] In the description of the invention, the "object side" may mean a surface of the lens facing the object side with respect to the optical axis (OA), and the "sensor side" may mean a surface of the lens facing the imaging surface (image sensor) with respect to the optical axis. The "object side" may be the "object side," and the "sensor side" may be the "image side." A convex surface of a lens may mean a convex shape in the optical axis or the paraxial region, and a concave surface of a lens may mean a concave shape in the optical axis or the paraxial region. The radius of curvature, the center thickness, and the optical axis spacing between lenses described in the table for lens data may mean values ​​(unit: mm) in the optical axis. The vertical direction may mean a direction perpendicular to the optical axis, and the end of a lens or lens surface may mean the end of an effective area of ​​a lens through which incident light passes. The size of the effective diameter of the lens surface may have a measurement error of up to ±0.4 mm depending on the measurement method, etc. The above-mentioned near-axis region refers to a very narrow region near the optical axis, and is a region where the distance that a light ray falls from the optical axis (OA) is almost 0. Hereinafter, the meaning of the optical axis may include the center of each lens or a very narrow region near the optical axis.

[0048]

[0049] As shown in FIGS. 1 and 8, the optical system (1000, 1100) according to the first and second embodiments of the present invention may include six or more lenses. The optical system (1000, 1100) may include n lenses, where the n-th lens may be the last lens adjacent to the image sensor (300), and the (n-1)-th lens may be the lens closest to the last lens. n is an integer greater than or equal to 6, for example, 6 to 7.

[0050] The optical system (1000, 1100) or camera module may include a plurality of lens groups (LG1, LG2). For example, the optical system (1000, 1100) may include a first lens group (LG1) and a second lens group (LG2) sequentially arranged along the optical axis (OA) from the object side toward the image sensor (300). The second lens group (LG2) may be arranged on the sensor side of the first lens group (LG1). Each of the plurality of lens groups (LG1, LG2) includes at least two lenses. The number of lenses of the second lens group (LG2) may be equal to or greater than the number of lenses of the first lens group (LG1), and for example, may be two to three times the number of lenses of the first lens group (LG1).

[0051] The first lens group (LG1) may include two or fewer lenses. The first lens group (LG1) may include, for example, two lenses. The second lens group (LG2) may include five or more and six or fewer lenses. The second lens group (LG2) may include, for example, six lenses. The optical system (1000, 1100) may include seven or fewer lenses.

[0052]

[0053] The first lens group (LG1) can have positive (+) refractive power. The second lens group (LG2) can have negative (-) refractive power, unlike the first lens group (LG1). The first lens group (LG1) and the second lens group (LG2) have different focal lengths, so that they can have good optical performance at the center and periphery of the field of view (FOV). Refractive power is the inverse of the focal length. Among the lenses of the first lens group (LG1), the lens closest to the object side can have positive (+) refractive power, and among the lenses of the second lens group (LG2), the lens closest to the sensor side can have negative (-) refractive power. The first lens group (LG1) refracts light incident through the object side to gather it, and the second lens group (LG2) can refract light emitted through the first lens group (LG1) to the periphery of the image sensor (300).

[0054] The focal length of the second lens group (LG2) may be greater than the focal length of the first lens group (LG1). For example, the focal length of the second lens group (LG2) may be at least five times the focal length of the first lens group (LG1). Accordingly, the optical system (1000, 1100) according to the embodiment may have improved aberration control characteristics such as chromatic aberration and distortion aberration by controlling the refractive power and focal length of each lens group (LG1, LG2), and may have good optical performance at the center and periphery of the field of view (FOV).

[0055] The composite focal length (f1~3) of the first lens group (LG1) may be 5 to 10. The composite focal length (f4~7) of the second lens group (LG2) may be -50 to -120. The absolute value of the composite focal length (f1~3) of the first lens group (LG1) may be smaller than the absolute value of the composite focal length (f4~7) of the second lens group (LG2). The power of the first lens group (LG1) may be greater than the power of the second lens group (LG2).

[0056]

[0057] Each lens (101-107, 201-207) can have an object-side surface and a sensor-side surface. The optical system (1000, 1100) has an aspherical lens, so it can correct various aberrations.

[0058] The effective diameter may be the diameter of the effective area where effective light is incident on each lens. The effective diameter is the length in the direction (X, Y) orthogonal to the optical axis, and is the average of the effective diameter on the object side of each lens and the effective diameter on the sensor side. The "diameter of the lens surface" may mean the "effective diameter of the lens." The "diameter of the lens" may be the diameter of the entire lens including the flange portion of the lens in addition to the effective area of ​​the lens. Although the flange of the lens is not illustrated in FIGS. 1 and 8, the flange may be a portion that protrudes perpendicular to the optical axis from the side of the lens so that the lens is coupled to the barrel. The flange may not receive effective light. A spacer may be additionally arranged between the flanges of different lenses so that the lenses are coupled to the barrel.

[0059] Each of the lenses (101-107, 201-207) may include an effective area and an ineffective area. The effective area may be an area through which light incident on each of the lenses passes. In other words, the effective area may be defined as an effective area or effective diameter through which the incident light is refracted to implement optical characteristics. The ineffective area may be arranged around the periphery of the effective area. The ineffective area may be an area through which effective light is not incident from a plurality of lenses. In other words, the ineffective area may be an area unrelated to the optical characteristics. In addition, an end of the ineffective area may be an area fixed to a lens barrel or the like that accommodates the lens.

[0060]

[0061] Within the optical system (1000, 1100), the TTL (Total top length) may be 0.1 times greater than Imgh, for example, 0.1 times greater and 1 time less. The TTL (Total track length) is the distance from the center of the object-side surface of the first lens to the top surface of the image sensor (300) on the optical axis (OA). Imgh is the distance from the optical axis (OA) to the diagonal end of the image sensor (300) or the maximum diagonal length. Within the optical system (1000, 1100), the effective focal length (EFL) may be provided to be 6 mm or greater and the field of view (FOV) to be less than 90 degrees. Accordingly, the optical system (1000, 1100) may provide an image without exaggeration or distortion for the formed image.

[0062] The effective diameter of the lens closest to the object side within the lens unit (100, 200) may be smaller than the effective diameter of the lens closest to the image sensor (300). Accordingly, the brightness of the optical system can be controlled. The effective diameter may be the average effective diameter of the object side and the sensor side of each lens. By controlling the size of the effective diameter of each lens, the optical system (1000, 1100) can control the incident light to compensate for the deterioration of optical characteristics due to resolution and temperature change, improve the chromatic aberration control characteristics, and improve the vignetting characteristics of the optical system (1000, 1100).

[0063] Since the lens unit (100, 200) uses a plastic lens, the optical system (1000, 1100) can be made lighter and cheaper by reducing the thickness of the plastic lens, and the plastic lens can provide good correction for various aberrations such as spherical aberration and chromatic aberration. In addition, since the plastic lenses can provide aspherical lenses, distortion in the peripheral area can be minimized.

[0064] The lens unit (100, 200) may include a first lens (101, 201), a second lens (102, 202), a third lens (103, 203), a fourth lens (104, 204), a fifth lens (105, 205), a sixth lens (106, 206), and a seventh lens (107, 207) aligned from the object side toward the sensor side along the optical axis.

[0065]

[0066] The optical system (1000, 1100) or camera module may include an image sensor (300). The image sensor (300) can detect light and convert it into an electrical signal. The image sensor (300) can detect light that sequentially passes through the lens unit (100, 200). The image sensor (300) may include an element capable of detecting incident light, such as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0067]

[0068] The optical system (1000, 1100) or camera module may include a filter. The filter may be positioned between the last lens and the image sensor (300). The filter may be positioned between the lens closest to the sensor side among the lenses of the lens unit (100, 200) and the image sensor (300). For example, the filter may be positioned between the nth lens and the image sensor (300).

[0069] The cover glass is placed between the filter (400) and the image sensor (300), and protects the upper portion of the image sensor (300) and can prevent a decrease in the reliability of the image sensor (300). The cover glass can be removed. The cover glass may be a protective glass.

[0070] The filter (400) may include an infrared filter or an infrared cut-off filter (IR cut-off). The filter (400) may allow light of a set wavelength band to pass through and filter out light of a different wavelength band. When the filter (400) includes an infrared filter, it may block radiant heat emitted from external light from being transmitted to the image sensor (300). In addition, the filter (400) may transmit visible light and reflect infrared light.

[0071] An optical system (1000, 1100) according to an embodiment may include an aperture (Stop). The aperture may control the amount of light incident on the optical system (1000, 1100). An optical system (1000, 1100) according to an embodiment may have an aperture device positioned between two adjacent lenses. The aperture device may control the amount of light passing through the lenses. The aperture device may control the amount of light incident on the image sensor (300). The aperture device may control the size of a hole through which light passes.

[0072] The aperture device can be arranged on the lens. The aperture device can be arranged on the lens. The aperture device can be combined with the lens. The aperture device can be fixed to the lens. The aperture device can move integrally with the lens. The aperture device can move together with the lens. The aperture device can move along the optical axis together with the lens.

[0073] The distance between the lenses on which the aperture device is arranged may be greater in center spacing than in edge spacing. The edge spacing between the lenses on which the aperture device is arranged may be 0.2 mm or more and 1 mm or less, and preferably 0.3 mm or more and 0.6 mm or less. The ratio of the center spacing to the edge spacing between the lenses on which the aperture device is arranged may be 1 or more and 1.5 or less, and preferably 1 or more and 1.1 or less.

[0074] The signs of the radii of curvature of the sensor side of the lens adjacent to the object side and the object side of the lens adjacent to the sensor side may be the same. The ratio of the radii of curvature of the sensor side of the lens adjacent to the object side and the object side of the lens adjacent to the sensor side may be 0.5 or more and 1.0 or less, and preferably 0.8 or more and 1.0 or less.

[0075] For example, when the aperture device is arranged between the first lens (101, 201) and the second lens (102, 202), the signs of the curvature radii of the sensor side (second surface (S2)) of the first lens (101, 201) and the object side (third surface (S3)) of the second lens (102, 202) may be the same. The sensor side (second surface (S2)) of the first lens (101, 201) may have a concave shape, and the object side (third surface (S3)) of the second lens (102, 202) may have a convex shape. Through this, interference between the aperture device and the lens or interference between the driving of the blades of the aperture device and the lens can be minimized.

[0076]

[0077] In the optical systems (1000, 1100) of the first and second embodiments, the sum of the refractive indices of the lenses of the lens unit (100, 200) may be 10 or more, for example, in the range of 10 to 15, and the average of the refractive indices may be 1.55 to 1.65. The sum of the Abbe numbers of each of the lenses may be 300 or more, for example, in the range of 300 to 350, and the average of the Abbe numbers may be 50 or less, for example, in the range of 35 to 47. The sum of the central thicknesses of the entire lens may be 4 mm or more, for example, in the range of 4 mm to 6 mm, and the average of the central thicknesses may be in the range of 0.5 mm to 0.8 mm. The sum of the central spacings between the lenses on the optical axis (OA) may be 2 mm or more, for example, in the range of 3 mm to 4 mm, and may be smaller than the sum of the central thicknesses of the lenses. Additionally, the average value of the effective diameter of each lens surface (S1-S14) of the lens unit (100, 200) can be provided in the range of 5 mm or more, for example, 5 mm to 8 mm.

[0078] The F number of the optical system or camera module according to the first and second embodiments of the invention may be 2.4 or less, for example, in the range of 1.0 to 2.4 or in the range of 1.4 to 1.6. The maximum angle of view (diagonal) in the optical system may be 90 degrees or less, for example, in the range of 70 degrees to 90 degrees.

[0079]

[0080] An optical system according to a first embodiment of the invention will be described.

[0081] FIG. 1 is a side cross-sectional view of an optical system according to a first embodiment and a camera module having the same, FIG. 2 is a table showing aspherical coefficients of lenses in the optical system of FIG. 1, FIG. 3 is a table showing Sag values ​​of lens surfaces of first to seventh lenses in the optical system of FIG. 1, FIG. 4 is a table showing thicknesses of lenses and spacings between lenses in a direction perpendicular to an optical axis in the optical system of FIG. 1, FIG. 5 is a table showing Slope angles of lens surfaces of first to eighth lenses in the optical system of FIG. 1, FIG. 6 is a graph showing data on diffraction MTF (Modulation Transfer Function) of the optical system of FIG. 1, and FIG. 7 is a graph showing data on aberration characteristics of the optical system of FIG. 1.

[0082] Referring to FIG. 1, the optical system (1000) includes a lens unit (100), and the lens unit (100) may include a first lens (101) to a seventh lens (107). The first to seventh lenses (101 to 107) may be sequentially arranged along the optical axis (OA) of the optical system (1000). Light corresponding to information about an object may pass through the first lens (101) to the seventh lens (107) and the filter (400) (400) and be incident on the image sensor (300).

[0083] The first lens (101) may be arranged closest to the object side. The first lens (101) may be arranged farthest from the sensor side. The first lens (101) may have positive (+) refractive power on the optical axis (OA). The first lens (101) may include a plastic material or a glass material, and may be, for example, a plastic material. At least one or both of the first surface (S1) and the second surface (S2) may be aspherical. The aspherical coefficients of the first and second surfaces (S1, S2) may be provided as S1 and S2 of L2 in FIG. 2.

[0084] The first surface (S1) on the object side of the first lens (101) with respect to the optical axis may be convex, and the second surface (S2) on the sensor side may be concave. The first lens (101) may have a concave meniscus shape toward the sensor side. The first lens (101) may have a convex meniscus shape toward the object side. The first lens (101) is made of a plastic material and may have an aspherical surface.

[0085] The refractive index (n1) of the first lens (101) can satisfy the condition of n1>1.4 or n1>1.45. When the refractive index (n1) of the first lens (101) satisfies the condition, the radius of curvature of the first and second lenses (101, 102) can be increased, and lens manufacturing can be facilitated. When the refractive index (n1) of the first lens (101) is smaller than the condition, the lens surface must be formed to be sharply concave or convex in order to increase the refractive power of the first and second lenses (101, 102). In this case, lens manufacturing is not easy, the lens defect rate increases, and it may cause a decrease in yield.

[0086] At least one or both of the first surface (S1) and the second surface (S2) of the first lens (101) can be provided without a critical point from the optical axis to the end of the effective area.

[0087] The aperture (Stop) may be arranged around the sensor-side second surface (S2) of the first lens (101). The aperture (Stop) may be arranged around the object-side third surface (S3) of the second lens (102). The aperture can reduce the TTL within the field of view range and enable miniaturization of the optical system. Accordingly, a decrease in the yield by weight of the optical system can be prevented and production efficiency can be improved.

[0088]

[0089] The second lens (102) may be arranged second from the object side. The second lens (102) may be arranged sixth from the sensor side. The second lens (102) may be arranged between the first lens (101) and the third lens (103). The second lens (102) may have negative (-) refractive power in the optical axis (OA). The second lens (102) may include a plastic or glass material. For example, the second lens (102) may be provided as a plastic material.

[0090] The third surface (S3) on the object side of the second lens (102) with respect to the optical axis (OA) may be convex, and the fourth surface (S4) on the sensor side may be concave. The second lens (102) may have a concave meniscus shape toward the sensor side. The second lens (102) may have a convex meniscus shape toward the object side. The second lens (102) may be made of a plastic material and may be aspherical. At least one or both of the third surface (S3) and the fourth surface (S4) may be aspherical. The aspherical coefficients of the third and fourth surfaces (S3, S4) may be provided as S1 and S2 of L2 in FIG. 2.

[0091] At least one or both of the third surface (S3) and the fourth surface (S4) of the second lens (102) can be provided without a critical point from the optical axis (OA) to the end of the effective area.

[0092]

[0093] The third lens (103) may be arranged third from the object side. The third lens (103) may be arranged fifth from the sensor side. The third lens (103) may be arranged between the second lens (102) and the fourth lens (104). The third lens (103) may have positive (+) refractive power on the optical axis (OA). The third lens (103) may include a plastic or glass material. For example, the third lens (103) may be provided as a plastic material.

[0094] The fifth surface (S5) on the object side of the third lens (103) with respect to the optical axis may be concave, and the sixth surface (S6) on the sensor side may be convex. The third lens (103) may have a meniscus shape in which the sensor side is convex. The third lens (103) may have a meniscus shape in which the object side is concave. When the lens has a meniscus shape, light can be efficiently refracted. When the lens has a meniscus shape made of a plastic material, light can be efficiently refracted with a thin thickness. The third lens (103) may be made of a plastic material and may be aspherical. At least one or both of the fifth surface (S5) and the sixth surface (S6) may be aspherical. The aspherical coefficients of the fifth and sixth surfaces (S5, S6) may be provided as S1 and S2 of L3 in FIG. 2.

[0095] At least one or both of the fifth surface (S5) and the sixth surface (S6) of the third lens (103) can be provided without a critical point from the optical axis to the end of the effective area.

[0096]

[0097] The fourth lens (104) may be arranged fourth from the object side. The fourth lens (104) may be arranged fourth from the sensor side. The fourth lens (104) may be arranged between the third lens (103) and the fifth lens (105). The fourth lens (104) may have positive (+) or negative (-) refractive power on the optical axis (OA). The fourth lens (104) may have negative (-) refractive power. The fourth lens (104) may include a plastic or glass material. For example, the fourth lens (104) may be provided with a plastic material.

[0098] The seventh surface (S7) on the object side of the fourth lens (104) with respect to the optical axis may be convex, and the eighth surface (S8) on the sensor side may be concave. The fourth lens (104) may have a meniscus shape in which the sensor side is concave. The fourth lens (104) may have a meniscus shape in which the object side is convex. The fourth lens (104) may be made of a plastic material and may have an aspherical surface. When the lens has a meniscus shape, light can be efficiently refracted. When the lens is made of a plastic material and has a meniscus shape, light can be efficiently refracted with a thin thickness. At least one or both of the seventh surface (S7) and the eighth surface (S8) may be aspherical. The aspherical coefficients of the seventh and eighth surfaces (S7, S8) may be provided as S1 and S2 of L4 in FIG. 2.

[0099] The seventh surface (S7) of the fourth lens (104) may have a critical point from the optical axis to the end of the effective area. When the seventh surface (S7) has a critical point, it may be located in a range of 30% to 50%, preferably 35% to 45%, of the effective radius from the optical axis. The critical point of the seventh surface (S7) may be located in a range of 0.3 mm to 1.5 mm, preferably 0.5 mm to 1 mm from the optical axis. The critical point of the seventh surface (S7) may be a point where the sign of the gradient value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the gradient value is 0. In addition, the critical point of the seventh surface (S7) may be a point where the gradient value of a tangent passing through the lens surface increases and then decreases, or a point where the gradient value decreases and then increases.

[0100] The eighth surface (S8) of the fourth lens (104) may have a critical point from the optical axis to the end of the effective area. When the eighth surface (S8) has a critical point, it may be located in a range of 30% to 50%, preferably 40% to 45%, of the effective radius from the optical axis. The critical point of the eighth surface (S8) may be located in a range of 0.5 mm to 1.5 mm, preferably 0.8 mm to 1.3 mm from the optical axis. The critical point of the eighth surface (S8) may be a point where the sign of the gradient value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the gradient value is 0. In addition, the critical point of the eighth surface (S8) may be a point where the gradient value of a tangent passing through the lens surface increases and then decreases, or a point where the gradient value decreases and then increases.

[0101]

[0102] The fifth lens (105) may be arranged as the fifth lens from the object side. The fifth lens (105) may be arranged as the third lens from the sensor side. The fifth lens (105) may be arranged between the fourth lens (104) and the sixth lens (106). The fifth lens (105) may have positive (+) or negative (-) refractive power on the optical axis (OA). The fifth lens (105) may have negative (-) refractive power. The fifth lens (105) may include a plastic or glass material. For example, the fifth lens (105) may be provided as a plastic material.

[0103] With respect to the optical axis (OA), the ninth surface (S9) on the object side of the fifth lens (105) may be concave, and the tenth surface (S10) on the sensor side may be concave. The fifth lens (105) may have a shape in which both sides are concave. The fifth lens (105) may be made of a plastic material and may have an aspherical surface. At least one of the ninth surface (S9) and the tenth surface (S10) may be an aspherical surface. The aspherical coefficients of the ninth and tenth surfaces (S9, S10) may be provided as S1 and S2 of L5 in FIG. 2.

[0104] The ninth surface (S9) of the fifth lens (105) can be provided without a critical point from the optical axis to the end of the effective area.

[0105] The tenth surface (S10) of the fifth lens (105) may have a critical point from the optical axis to the end of the effective area. When the tenth surface (S10) has a critical point, it may be located in a range of 1% to 15%, preferably 5% to 10%, of the effective radius from the optical axis. The critical point of the tenth surface (S10) may be located in a range of 0.1 mm to 1 mm, preferably 0.1 mm to 0.5 mm from the optical axis. The critical point of the tenth surface (S10) may be a point where the sign of the gradient value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the gradient value is 0. In addition, the critical point of the tenth surface (S10) may be a point where the gradient value of a tangent passing through the lens surface increases and then decreases, or a point where the gradient value decreases and then increases.

[0106]

[0107] The sixth lens (106) may be arranged as the sixth lens from the object side. The sixth lens (106) may be arranged as the second lens from the sensor side. The sixth lens (106) may be arranged between the fifth lens (105) and the seventh lens (107). The sixth lens (106) may have positive (+) or negative (-) refractive power on the optical axis (OA). The sixth lens (106) may have positive (+) refractive power. The sixth lens (106) may include a plastic or glass material. For example, the sixth lens (106) may be provided as a plastic material.

[0108] The object-side eleventh surface (S11) of the sixth lens (106) with respect to the optical axis may be convex, and the sensor-side twelfth surface (S12) may be concave. The sixth lens (106) may have a concave meniscus shape on the sensor side. The sixth lens (106) may have a convex meniscus shape on the object side. When the lens has a meniscus shape, light can be efficiently refracted. When the lens has a meniscus shape made of a plastic material, light can be efficiently refracted with a thin thickness. At least one or both of the eleventh surface (S11) and the twelfth surface (S12) may be aspherical. The aspherical coefficients of the eleventh and twelfth surfaces (S11, S12) may be provided as S1 and S2 of L6 in FIG. 2.

[0109] The eleventh surface (S11) of the sixth lens (106) may have a critical point from the optical axis (OA) to the end of the effective area. When the eleventh surface (S11) has a critical point, it may be located in a range of 40% to 60%, preferably in a range of 55% to 60%, of the effective radius from the optical axis (OA). The critical point of the eleventh surface (S11) may be located in a range of 1.5 mm to 2.5 mm, preferably in a range of 1.8 mm to 2.3 mm from the optical axis (OA).

[0110] The critical point of the eleventh surface (S11) is a point where the sign of the slope value with respect to the optical axis (OA) and the direction perpendicular to the optical axis (OA) changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. In addition, the critical point of the eleventh surface (S11) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or a point where the slope value decreases and then increases.

[0111] The twelfth surface (S12) of the sixth lens (106) may have a critical point from the optical axis (OA) to the end of the effective area. When the twelfth surface (S12) has a critical point, it may be located in a range of 40% to 60%, preferably 45% to 55%, of the effective radius from the optical axis (OA). The critical point of the eleventh surface (S11) may be located in a range of 1.5 mm to 2.5 mm, preferably 1.8 mm to 2.3 mm from the optical axis (OA).

[0112] The critical point of the 12th surface (S12) is a point where the sign of the slope value with respect to the optical axis (OA) and the direction perpendicular to the optical axis (OA) changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. In addition, the critical point of the 12th surface (S12) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or a point where the slope value decreases and then increases.

[0113]

[0114] The seventh lens (107) may be arranged closest to the sensor side. The seventh lens (107) may be arranged farthest from the object side. The seventh lens (107) may have positive (+) or negative (-) refractive power on the optical axis (OA). The seventh lens (107) may have negative (-) refractive power. The seventh lens (107) may include a plastic or glass material. For example, the seventh lens (107) may be made of a plastic material.

[0115] The object-side 13th surface (S13) of the seventh lens (107) on the optical axis may be concave, and the sensor-side 14th surface (S14) may be concave. The seventh lens (107) may have a concave shape on both sides. At least one of the 13th surface (S13) and the 14th surface (S14) may be aspherical. For example, both the 13th surface (S13) and the 14th surface (S14) may be aspherical. The aspherical coefficients of the 13th and 14th surfaces (S13, S14) may be provided as S1 and S2 of L8 in FIG. 9.

[0116] The 13th surface (S13) of the seventh lens (107) may be provided without a critical point from the optical axis (OA) to the end of the effective area. The 14th surface (S14) of the seventh lens (107) may have a critical point from the optical axis (OA) to the end of the effective area. When the 14th surface (S14) has a critical point, it may be located in a range of 25% to 45%, preferably in a range of 30% to 35%, of the effective radius from the optical axis (OA). The critical point of the 14th surface (S14) may be located in a range of 1 mm to 2 mm, preferably in a range of 1.5 mm to 2.0 mm from the optical axis (OA).

[0117] The critical point of the 14th surface (S14) is a point where the sign of the slope value with respect to the optical axis (OA) and the direction perpendicular to the optical axis (OA) changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. In addition, the critical point of the 14th surface (S14) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or a point where the slope value decreases and then increases.

[0118]

[0119] LensSurfaceRadiusThicknessndvdSemiApertureFocal length1S12.9831.4021.49783.6462.4208.096 S29.7390.445 2.298 Stopinfinity0.100 2.159 2S310.0170.3001.671419.2382.057-37.454 S47.0950.544 1.900 3 S5-22.6880.5661.544156.1151.87731.485S6-9.8660.041 1.900 4S710.9850.3831.634923.961.970-53.011 S88.1850.640 2.229 5S9-57.6910.5321.56737.5652.567-76.843 S10182.1880.294 2.850 6S113.8060.7131.544156.1153.4907.166 S12130.7171.190 3.891 7S13-3.6690.5001.534355.6564.265-5.043 S1410.7660.440 5.036 FilterS15infinity0.210 5.829 S16infinity0.388 5.902 Image infinity0.011 6.130

[0120] Table 1 shows the surface number (Surface), radius of curvature (Radius), center thickness of each lens or distance between lens surfaces (Thickness), refractive index (Index,nd), Abbe number (Abbe,vd), effective radius (Semi Aperture), and focal length (Fcoal length) of the lens according to the first embodiment of the present invention. At this time, the unit of the radius of curvature and thickness or distance may be mm.

[0121]

[0122] Item ValueItem ValueF7.138ET10.401ΣIndex10.993ET20.415ΣAbbe332.295ET30.409ΣCT4.396ET40.350ΣCG3. 255ET50.350CA_max9.301ET60.406CA_min3.777ET71.162CA_Aver5.536F-number1.481CT_max1 .402FOV_D80.070CT_min0.300LG1_F9.534CT_Aver0.628LG2_F-107.087EPD4.821EG10.5174BFL 1.049EG20.0802TD8.091EG30.1055ImgH12.260EG40.5571SD6.243EG50.5512TTL8.700EG60.2444

[0123] Table 2 shows the items of the mathematical formulas described above in the optical system (1000) of the embodiment, including the total track length (TTL) (mm), back focal length (BFL), effective focal length (F) (mm), ImgH (mm), effective diameter (CA) (mm), thickness (mm), TTL (mm), the optical axis distance from the first surface (S1) to the fourteenth surface (S14) TD (mm), the optical axis distance from the stop (Stop) to the fourteenth surface (S14) SD (mm), the sum of refractive indices, the sum of Abbe numbers, the sum of thicknesses (mm), the sum of spacings between adjacent lenses, the effective diameter characteristics, the diagonal angle of view (FOV_D) (Degree), the vertical angle of view (FOV_V) (Degree), the horizontal angle of view (FOV_H) (Degree), the edge thickness (ET), the F number, the edge spacing (EG) between edges, etc. of the optical system (1000). LG1_F is the composite focal length of the first lens group (LG1) (mm), and LG2_F is the composite focal length of the second lens group (LG2) (mm).

[0124]

[0125] The center thicknesses of the first to seventh lenses (101 to 107) are represented by CT1 to CT7, the edge thicknesses at the ends of the effective areas of each lens are represented by ET1 to ET7, the center gap between two adjacent lenses is represented by CG1 to CG6, and the edge gaps between the edges of each lens are represented by EG1 to EG7. BFL (Back focal length) is the optical axis distance from the image sensor (300) to the center of the last lens. TTL is the optical axis distance from the center of the first surface (S1) of the first lens (101) to the upper surface of the image sensor (300).

[0126] As shown in FIG. 2, among the lenses of the lens unit (100) in the first embodiment, the lens surfaces of the first to seventh lenses (101 to 107) may include aspherical surfaces having a 30th-order aspherical surface coefficient. For example, the first to seventh lenses (101 to 107) may include lens surfaces having a 30th-order aspherical surface coefficient. As described above, an aspherical surface having a 30th-order aspherical surface coefficient (a value other than "0") can significantly change the aspherical shape of the periphery, and thus can effectively correct the optical performance of the periphery of the field of view (FOV).

[0127] When comparing the absolute values ​​of the curvature radii of each lens, the curvature radii of the tenth surface (S10) of the fifth lens (105) on the optical axis (OA) may be the largest among the lenses, and the curvature radii of the first surface (S1) of the first lens (101) may be the smallest among the lenses. The difference between the maximum curvature radii and the minimum curvature radii may be 50 times or more, for example, 60 to 70 times. The curvature radii of the object-side surface of the first lens (101) may be the smallest among the lenses.

[0128] The absolute value of the curvature radius of the first surface (S1) of the first lens (101) may be smaller than the absolute value of the curvature radius of the second surface (S2). The absolute value of the curvature radius of the third surface (S3) of the second lens (102) may be larger than the absolute value of the curvature radius of the fourth surface (S4). The absolute value of the curvature radius of the fifth surface (S5) of the third lens (103) may be larger than the absolute value of the curvature radius of the sixth surface (S6). The absolute value of the curvature radius of the seventh surface (S7) of the fourth lens (104) may be larger than the absolute value of the curvature radius of the eighth surface (S8). The absolute value of the curvature radius of the ninth surface (S9) of the fifth lens (105) may be smaller than the absolute value of the curvature radius of the tenth surface (S10). The absolute value of the radius of curvature of the eleventh surface (S11) of the sixth lens (106) may be smaller than the absolute value of the radius of curvature of the twelfth surface (S12). The absolute value of the radius of curvature of the thirteenth surface (S13) of the seventh lens (107) may be smaller than the absolute value of the radius of curvature of the fourteenth surface (S14).

[0129] The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0130] Condition 1: 0.1 < |L1R1 / L1R2| < 0.5

[0131] Condition 2: 1 < |L2R1 / L2R2| < 1.5

[0132] Condition 3: 2 < |L3R1 / L3R2| < 2.5

[0133] Condition 4: 1 < |L4R1 / L4R2| < 1.5

[0134] Condition 5: 0.1 < |L5R1 / L5R2| < 0.5

[0135] Condition 6: 0.1 < |L6R1 / L6R2| < 0.5

[0136] Condition 7: 0.1 < |L7R1 / L7R2| < 0.5

[0137]

[0138] When describing the central thickness of the lenses based on the optical axis, the central thickness (CT1) of the first lens (101) is the largest among the lenses, and the central thickness (CT2) of the second lens (102) is the smallest among the lenses. The difference between the maximum and minimum central thicknesses among the lenses may be in the range of 1 mm or more and 1.5 mm or less.

[0139] By setting the center thickness (CT1) of the first lens (101) closest to the object side in the optical system (1000) to the largest, the light path incident on the optical system (1000) is set, and good optical performance can be achieved at the set angle of view and focal length. The center thickness (CT1) of the first lens (101) is set to be larger than the center spacing of the sixth lens (106) and seventh lens (107), which have the largest center spacing among the spacings between adjacent lenses, so that a gentle light path can be formed at a short TTL, thereby forming a stable optical system.

[0140] The central thickness of each lens may satisfy any one of the conditions below.

[0141] Condition 1: CT1 > CT2, CT3, CT4, CT5, CT6, CT7

[0142] Condition 2: CT1, CT3, CT4, CT5, CT6, CT7 > CT2

[0143] Condition 3: CT1, CT6 > CT3 > CT2, CT4, CT5, CT7

[0144] Condition 4: CT1, CT3, CT5, CT6, CT7 > CT4 > CT2

[0145] Condition 5: CT1, CT3, CT6 > CT5 > CT2, CT4, CT7

[0146] Condition 6: CT1 > CT6 > CT2, CT3, CT4, CT5, CT7

[0147] Condition 7: CT1, CT3, CT5, CT6 > CT7 > CT2, CT4

[0148]

[0149] When describing the center spacing (CG) between the lenses, the center spacing (CG6) between the sixth lens (106) and the seventh lens (107) may be the maximum, and the center spacing (CG3) between the third and fourth lenses (103, 104) may be the minimum. The difference between the maximum center spacing and the minimum center spacing among the spaced lens spacings may be 1 mm or more, for example, in the range of 1 mm to 1.3 mm.

[0150] The distance (CG1) between the first lens (101) and the second lens (102) where the aperture is positioned can be set to be greater than the distance (CG3) between the third lens (103) and the fourth lens (104) where the aperture is not positioned. This allows space for positioning the aperture within a short TTL and minimizes interference with the operation of the aperture.

[0151] The center spacing between each lens can satisfy the following conditions.

[0152] Condition 1: CG4, CG6 > CG1 > CG2, CG3, CG5

[0153] Condition 2: CG1, CG4, CG6 > CG2 > CG3, CG5

[0154] Condition 3: CG1, CG2, CG4, CG5, CG6 > CG3

[0155] Condition 4: CG6 > CG4 > CG1, CG2, CG3, CG5

[0156] Condition 5: CG1, CG2, CG4, CG6 > CG5 > CG3

[0157] Condition 6: CG6 > CG1, CG2, CG3, CG4, CG5

[0158]

[0159] Regarding the effective diameter, the lens with the maximum effective diameter may be the seventh lens (107) closest to the image sensor (300). The lens with the maximum effective diameter may be a plastic lens. Here, the effective diameter is the average of the effective diameters on the object side and the sensor side of each lens. The lens surface with the maximum effective diameter may be the fourteenth surface (S14) of the seventh lens (107).

[0160] The lens having the minimum effective diameter may be any one of the plastic material lenses, and for example, the effective diameter of the second lens (102) may be the minimum within the lens unit (100). The lens surface having the minimum effective diameter may be the fourth surface (S4) of the second lens (102) and the sixth surface (S6) of the third lens (103).

[0161] The effective diameter of each lens can satisfy any one of the conditions below.

[0162] Condition 1: CA_L5, CA_L6, CA_L7 > CA_L1 > CA_L2, CA_L3, CA_L4

[0163] Condition 2: CA_L1, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L2 > CA_L3

[0164] Condition 3: CA_L1, CA_L2, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L3

[0165] Condition 4: CA_L1, CA_L5, CA_L6, CA_L7 > CA_L4 > CA_L2, CA_L3

[0166] Condition 5: CA_L6, CA_L7 > CA_L5 > CA_L1, CA_L2, CA_L3, CA_L4

[0167] Condition 6: CA_L7 > CA_L6 > CA_L1, CA_L2, CA_L3, CA_L4, CA_L5

[0168] Condition 7: CA_L7 > CA_L1, CA_L2, CA_L3, CA_L4, CA_L5, CA_L6

[0169]

[0170] Regarding the refractive index, the refractive index of the second lens (102) may be the highest among the lenses and may be greater than 1.5, for example, greater than 1.6. The first lens (101) may have the lowest refractive index among the lenses. For example, the refractive index of the first lens (101) may be the lowest among the lenses and may be less than 1.55, for example, less than 1.5. The difference between the maximum refractive index and the minimum refractive index may be 0.1 or more.

[0171] The refractive index of each lens can satisfy any of the conditions below.

[0172] Condition 1: n2, n3, n4, n5, n6, n7 > n1

[0173] Condition 2: n2 > n1, n3, n4, n5, n6, n7

[0174] Condition 3: n2, n4, n5 > n3 = n6 > n1, n7

[0175] Condition 4: n2 > n4 > n1, n3, n5, n6, n7

[0176] Condition 5: n2, n4 > n5 > n1, n3, n6, n7

[0177]

[0178] Comparing the Abbe numbers, the Abbe number of the first lens (101) is the largest among the lenses and may be 80 or more. The Abbe number of the second lens (102) is the smallest among the lenses and may be 20 or less. The difference between the maximum Abbe number and the minimum Abbe number may be 60 or more.

[0179] The Abbe number of each lens can satisfy any of the conditions below.

[0180] Condition 1: v1 > v2, v3, v4, v5, v6, v7

[0181] Condition 2: v1, v3, v4, v5, v6, v7 > v2

[0182] Condition 3: v1 > v3 = v6 > v2, v4, v5, v7

[0183] Condition 4: v1, v3, v5, v6, v7 > v4 > v2

[0184] Condition 5: v1, v3, v6, v7 > v5 > v2, v4

[0185]

[0186] The focal lengths (F2, F4, F5, F7) of the 2nd, 4th, 5th, and 7th lenses (102, 104, 105, and 107) may have negative (-) signs. The 2nd, 4th, 5th, and 7th lenses (102, 104, 105, and 107) may have negative (-) refractive power. The focal lengths (F1, F3, and F6) of the 1st, 3rd, and 6th lenses (101, 103, and 106) may have positive (+) signs. The 1st, 3rd, and 6th lenses (101, 103, and 106) may have positive (+) refractive power.

[0187] When comparing the focal lengths in absolute values, the focal length of the fifth lens (105) is the largest among the lenses, and may be 60 or more and 80 or less. Among the lenses, the fifth lens (105) made of plastic may have the largest focal length and the smallest refractive power. The focal length of the seventh lens (107) is the smallest among the lenses, and the absolute value of the focal length of the seventh lens (107) may be 5 or more and 10 or less. Among the lenses, the seventh lens (107) made of plastic may have the smallest focal length and the largest refractive power.

[0188] Among the lenses, the lens having the minimum focal length may be the seventh lens (107). The difference between the maximum focal length and the minimum focal length may be 60 or more or 70 or more. Accordingly, the optical system may have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. in the set angle of view range, and may have good optical performance in the periphery of the angle of view.

[0189] The absolute value of the focal length of each lens can satisfy any of the conditions below.

[0190] Condition 1: |f2|, |f3|, |f4|, |f5| > |f1| > |f6|, |f7|

[0191] Condition 2: |f4|, |f5| > |f2| > |f1|, |f3|, |f6|, |f7|

[0192] Condition 3: |f2|, |f4|, |f5| > |f3| > |f1|, |f6|, |f7|

[0193] Condition 4: |f5| > |f4| > |f1|, |f2|, |f3|, |f6|, |f7|

[0194] Condition 5: |f5| > |f1|, |f2|, |f3|, |f4|, |f6|, |f7|

[0195] Condition 6: |f1|, |f2|, |f3|, |f4|, |f5| > |f6| > |f7|

[0196] Condition 7: |f1|, |f2|, |f3|, |f4|, |f5|, |f6| > |f7|

[0197]

[0198] The thickness (T1) of the first lens (101) may be minimum at the edge and maximum at the center, and the maximum thickness is in the range of 3 to 4 times the minimum thickness. The thickness (T2) of the second lens (102) may be maximum at the edge and minimum at the center, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T3) of the third lens (103) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T4) of the fourth lens (104) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T5) of the fifth lens (105) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1.5 to 2 times the minimum thickness. The thickness (T6) of the sixth lens (106) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1.5 to 2 times the minimum thickness. The thickness (T7) of the seventh lens (107) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 2 to 2.5 times the minimum thickness.

[0199] The thickness of each lens can satisfy any of the conditions below.

[0200] Condition 1: 3 < CT1 / ET1 < 3.5, 0.1 < ET1 / CT1 < 0.5

[0201] Condition 2: 0.5 < CT2 / ET2 < 1, 1 < ET2 / CT2 < 1.5

[0202] Condition 3: 1 < CT3 / ET3 < 1.5, 0.5 < ET3 / CT3 < 1

[0203] Condition 4: 1 < CT4 / ET4 < 1.5, 0.5 < ET4 / CT4 < 1

[0204] Condition 5: 1.5 < CT5 / ET5 < 2, 0.5 < ET5 / CT5 < 1

[0205] Condition 6: 1.5 < CT6 / ET6 < 2, 0.5 < ET6 / CT6 < 1

[0206] Condition 7: 0.1 < CT7 / ET7 < 0.5, 2 < ET7 / CT7 < 2.5

[0207] Condition 8: 1 < ΣCT / ΣET < 1.5, 0.5 < ΣET / ΣCT < 1

[0208]

[0209] Among the gaps (G1-G6) between the lenses, the first gap (G1) between the first and second lenses (101, 102) may have a minimum in the center and a maximum in the edge. The second gap (G2) between the second and third lenses (102, 103) may have a minimum in the edge and a maximum in the center. The third gap (G3) between the third and fourth lenses (103, 104) may have a maximum in the edge and a minimum in the center. The fourth gap (G4) between the fourth and fifth lenses (104, 105) may have a maximum in the edge and a minimum in the center. The fifth gap (G5) between the fifth and sixth lenses (105, 106) may have a minimum in the center and a maximum in the edge. The sixth gap (G6) between the sixth and seventh lenses (106, 107) may have a maximum in the center and a minimum in the edge.

[0210]

[0211] An optical system according to a second embodiment of the invention will be described.

[0212] FIG. 8 is a side cross-sectional view of an optical system according to a second embodiment and a camera module having the same, FIG. 9 is a table showing aspherical coefficients of lenses in the optical system of FIG. 8, FIG. 10 is a table showing Sag values ​​of lens surfaces of first to seventh lenses in the optical system of FIG. 8, FIG. 11 is a table showing thicknesses of lenses and spacings between lenses in a direction perpendicular to an optical axis in the optical system of FIG. 8, FIG. 12 is a table showing Slope angles of lens surfaces of first to seventh lenses in the optical system of FIG. 8, FIG. 13 is a graph showing data on diffraction MTF (Modulation Transfer Function) of the optical system of FIG. 8, and FIG. 14 is a graph showing data on aberration characteristics of the optical system of FIG. 8.

[0213] Referring to FIG. 8, the optical system (1100) includes a lens unit (200), and the lens unit (200) may include a first lens (201) to a seventh lens (207). The first to seventh lenses (201 to 207) may be sequentially arranged along the optical axis (OA) of the optical system (1100). Light corresponding to information about an object may pass through the first lens (201) to the seventh lens (207) and the filter (400) (400) and be incident on the image sensor (300).

[0214] The first lens (201) may be arranged closest to the object side. The first lens (201) may be arranged farthest from the sensor side. The first lens (201) may have positive (+) refractive power on the optical axis (OA). The first lens (201) may include a plastic material or a glass material, and may be, for example, a plastic material. At least one or both of the first surface (S1) and the second surface (S2) may be aspherical. The aspherical coefficients of the first and second surfaces (S1, S2) may be provided as S1 and S2 of L2 in FIG. 2.

[0215] The first surface (S1) on the object side of the first lens (201) with respect to the optical axis may be convex, and the second surface (S2) on the sensor side may be concave. The first lens (201) may have a concave meniscus shape toward the sensor side. The first lens (201) may have a convex meniscus shape toward the object side. The first lens (201) may be made of a plastic material and may have an aspherical surface.

[0216] The refractive index (n1) of the first lens (201) can satisfy the condition of n1>1.4 or n1>1.45. When the refractive index (n1) of the first lens (201) satisfies the condition, the radius of curvature of the first and second lenses (201, 202) can be increased, and lens manufacturing can be facilitated. When the refractive index (n1) of the first lens (201) is smaller than the condition, the lens surface must be formed to be sharply concave or convex in order to increase the refractive power of the first and second lenses (201, 202). In this case, lens manufacturing is not easy, the lens defect rate increases, and it may cause a decrease in yield.

[0217] At least one or both of the first surface (S1) and the second surface (S2) of the first lens (201) can be provided without a critical point from the optical axis to the end of the effective area.

[0218] The aperture (stop) may be arranged around the sensor-side second surface (S2) of the first lens (201). The aperture (stop) may be arranged around the object-side third surface (S3) of the second lens (202). The aperture can reduce the TTL within the field of view range and enable miniaturization of the optical system. Accordingly, a decrease in the yield by weight of the optical system can be prevented and production efficiency can be improved.

[0219]

[0220] The second lens (202) may be arranged second from the object side. The second lens (202) may be arranged sixth from the sensor side. The second lens (202) may be arranged between the first lens (201) and the third lens (203). The second lens (202) may have negative (-) refractive power on the optical axis (OA). The second lens (202) may include a plastic or glass material. For example, the second lens (202) may be provided as a plastic material.

[0221] The third surface (S3) on the object side of the second lens (202) with respect to the optical axis (OA) may be convex, and the fourth surface (S4) on the sensor side may be concave. The second lens (202) may have a concave meniscus shape toward the sensor side. The second lens (202) may have a convex meniscus shape toward the object side. When the lens has a meniscus shape, light can be efficiently refracted. When the lens has a meniscus shape made of a plastic material, light can be efficiently refracted with a thin thickness. The second lens (202) may be made of a plastic material and may be aspherical. At least one or both of the third surface (S3) and the fourth surface (S4) may be aspherical. The aspherical coefficients of the third and fourth surfaces (S3, S4) may be provided as S1 and S2 of L2 in FIG. 2.

[0222] At least one or both of the third surface (S3) and the fourth surface (S4) of the second lens (202) can be provided without a critical point from the optical axis (OA) to the end of the effective area.

[0223]

[0224] The third lens (203) may be arranged third from the object side. The third lens (203) may be arranged fifth from the sensor side. The third lens (203) may be arranged between the second lens (202) and the fourth lens (204). The third lens (203) may have positive (+) refractive power on the optical axis (OA). The third lens (203) may include a plastic or glass material. For example, the third lens (203) may be provided as a plastic material.

[0225] The fifth surface (S5) on the object side of the third lens (203) with respect to the optical axis may be concave, and the sixth surface (S6) on the sensor side may be convex. The third lens (203) may have a meniscus shape in which the sensor side is convex. The third lens (203) may have a meniscus shape in which the object side is concave. When the lens has a meniscus shape, light can be efficiently refracted. When the lens has a meniscus shape made of a plastic material, light can be efficiently refracted with a thin thickness. The third lens (203) may be made of a plastic material and may be aspherical. At least one or both of the fifth surface (S5) and the sixth surface (S6) may be aspherical. The aspherical coefficients of the fifth and sixth surfaces (S5, S6) may be provided as S1 and S2 of L3 in FIG. 2.

[0226] At least one or both of the fifth surface (S5) and the sixth surface (S6) of the third lens (203) can be provided without a critical point from the optical axis to the end of the effective area.

[0227]

[0228] The fourth lens (204) may be arranged fourth from the object side. The fourth lens (204) may be arranged fourth from the sensor side. The fourth lens (204) may be arranged between the third lens (203) and the fifth lens (205). The fourth lens (204) may have positive (+) or negative (-) refractive power on the optical axis (OA). The fourth lens (204) may have negative (-) refractive power. The fourth lens (204) may include a plastic or glass material. For example, the fourth lens (204) may be provided as a plastic material.

[0229] The seventh surface (S7) on the object side of the fourth lens (204) with respect to the optical axis may be convex, and the eighth surface (S8) on the sensor side may be concave. The fourth lens (204) may have a meniscus shape in which the sensor side is concave. The fourth lens (204) may have a meniscus shape in which the object side is convex. When the lens has a meniscus shape, light can be efficiently refracted. When the lens has a meniscus shape made of a plastic material, light can be efficiently refracted with a thin thickness. The fourth lens (204) may be made of a plastic material and may have an aspherical surface. At least one or both of the seventh surface (S7) and the eighth surface (S8) may be aspherical. The aspherical coefficients of the seventh and eighth surfaces (S7, S8) may be provided as S1 and S2 of L4 in FIG. 2.

[0230] The seventh surface (S7) of the fourth lens (204) may have a critical point from the optical axis to the end of the effective area. When the seventh surface (S7) has a critical point, it may be located in a range of 30% to 50%, preferably 35% to 45%, of the effective radius from the optical axis. The critical point of the seventh surface (S7) may be located in a range of 0.3 mm to 1.5 mm, preferably 0.5 mm to 1 mm from the optical axis. The critical point of the seventh surface (S7) may be a point where the sign of the gradient value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the gradient value is 0. In addition, the critical point of the seventh surface (S7) may be a point where the gradient value of a tangent passing through the lens surface increases and then decreases, or a point where the gradient value decreases and then increases.

[0231] The eighth surface (S8) of the fourth lens (204) may have a critical point from the optical axis to the end of the effective area. When the eighth surface (S8) has a critical point, it may be located in a range of 35% to 55%, preferably 40% to 48%, of the effective radius from the optical axis. The critical point of the eighth surface (S8) may be located in a range of 0.5 mm to 1.5 mm, preferably 0.8 mm to 1.3 mm from the optical axis. The critical point of the eighth surface (S8) may be a point where the sign of the gradient value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the gradient value is 0. In addition, the critical point of the eighth surface (S8) may be a point where the gradient value of a tangent passing through the lens surface increases and then decreases, or a point where the gradient value decreases and then increases.

[0232]

[0233] The fifth lens (205) may be arranged as the fifth lens from the object side. The fifth lens (205) may be arranged as the third lens from the sensor side. The fifth lens (205) may be arranged between the fourth lens (204) and the sixth lens (206). The fifth lens (205) may have positive (+) or negative (-) refractive power on the optical axis (OA). The fifth lens (205) may have negative (-) refractive power. The fifth lens (205) may include a plastic or glass material. For example, the fifth lens (205) may be provided as a plastic material.

[0234] With respect to the optical axis (OA), the ninth surface (S9) on the object side of the fifth lens (205) may be concave, and the tenth surface (S10) on the sensor side may be concave. The fifth lens (205) may have a shape in which both sides are concave. The fifth lens (205) may be made of a plastic material and may have an aspherical surface. At least one of the ninth surface (S9) and the tenth surface (S10) may be an aspherical surface. The aspherical coefficients of the ninth and tenth surfaces (S9, S10) may be provided as S1 and S2 of L5 in FIG. 2.

[0235] The ninth surface (S9) of the fifth lens (205) can be provided without a critical point from the optical axis to the end of the effective area.

[0236] The tenth surface (S10) of the fifth lens (205) may have a critical point from the optical axis to the end of the effective area. When the tenth surface (S10) has a critical point, it may be located in a range of 5% to 25%, preferably 10% to 20%, of the effective radius from the optical axis. The critical point of the tenth surface (S10) may be located in a range of 0.1 mm to 1 mm, preferably 0.1 mm to 0.5 mm from the optical axis. The critical point of the tenth surface (S10) may be a point where the sign of the gradient value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the gradient value is 0. In addition, the critical point of the tenth surface (S10) may be a point where the gradient value of a tangent passing through the lens surface increases and then decreases, or a point where the gradient value decreases and then increases.

[0237]

[0238] The sixth lens (206) may be arranged as the sixth lens from the object side. The sixth lens (206) may be arranged as the second lens from the sensor side. The sixth lens (206) may be arranged between the fifth lens (205) and the seventh lens (207). The sixth lens (206) may have positive (+) or negative (-) refractive power on the optical axis (OA). The sixth lens (206) may have positive (+) refractive power. The sixth lens (206) may include a plastic or glass material. For example, the sixth lens (206) may be provided as a plastic material.

[0239] The object-side eleventh surface (S11) of the sixth lens (206) with respect to the optical axis may be convex, and the sensor-side twelfth surface (S12) may be concave. The sixth lens (206) may have a concave meniscus shape on the sensor side. The sixth lens (206) may have a convex meniscus shape on the object side. When the lens has a meniscus shape, light can be efficiently refracted. When the lens has a meniscus shape made of a plastic material, light can be efficiently refracted with a thin thickness. At least one or both of the eleventh surface (S11) and the twelfth surface (S12) may be aspherical. The aspherical coefficients of the eleventh and twelfth surfaces (S11, S12) may be provided as S1 and S2 of L6 in FIG. 2.

[0240] The eleventh surface (S11) of the sixth lens (206) may have a critical point from the optical axis (OA) to the end of the effective area. When the eleventh surface (S11) has a critical point, it may be located in a range of 40% to 60%, preferably in a range of 55% to 60%, of the effective radius from the optical axis (OA). The critical point of the eleventh surface (S11) may be located in a range of 1.5 mm to 2.5 mm, preferably in a range of 1.8 mm to 2.3 mm from the optical axis (OA).

[0241] The critical point of the eleventh surface (S11) is a point where the sign of the slope value with respect to the optical axis (OA) and the direction perpendicular to the optical axis (OA) changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. In addition, the critical point of the eleventh surface (S11) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or a point where the slope value decreases and then increases.

[0242] The twelfth surface (S12) of the sixth lens (206) may have a critical point from the optical axis (OA) to the end of the effective area. When the twelfth surface (S12) has a critical point, it may be located in a range of 40% to 60%, preferably 45% to 55%, of the effective radius from the optical axis (OA). The critical point of the eleventh surface (S11) may be located in a range of 1.5 mm to 2.5 mm, preferably 1.8 mm to 2.3 mm from the optical axis (OA).

[0243] The critical point of the 12th surface (S12) is a point where the sign of the slope value with respect to the optical axis (OA) and the direction perpendicular to the optical axis (OA) changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. In addition, the critical point of the 12th surface (S12) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or a point where the slope value decreases and then increases.

[0244]

[0245] The seventh lens (207) may be arranged closest to the sensor side. The seventh lens (207) may be arranged farthest from the object side. The seventh lens (207) may have positive (+) or negative (-) refractive power on the optical axis (OA). The seventh lens (207) may have negative (-) refractive power. The seventh lens (207) may include a plastic or glass material. For example, the seventh lens (207) may be made of a plastic material.

[0246] The object-side 13th surface (S13) of the seventh lens (207) on the optical axis may be concave, and the sensor-side 14th surface (S14) may be concave. The seventh lens (207) may have a concave shape on both sides. At least one of the 13th surface (S13) and the 14th surface (S14) may be aspherical. For example, both the 13th surface (S13) and the 14th surface (S14) may be aspherical. The aspherical coefficients of the 13th and 14th surfaces (S13, S14) may be provided as S1 and S2 of L8 in FIG. 9.

[0247] The 13th surface (S13) of the seventh lens (207) may be provided without a critical point from the optical axis (OA) to the end of the effective area. The 14th surface (S14) of the seventh lens (207) may have a critical point from the optical axis (OA) to the end of the effective area. When the 14th surface (S14) has a critical point, it may be located in a range of 25% to 45%, preferably in a range of 30% to 35%, of the effective radius from the optical axis (OA). The critical point of the 14th surface (S14) may be located in a range of 1 mm to 2 mm, preferably in a range of 1.3 mm to 1.8 mm from the optical axis (OA).

[0248] The critical point of the 14th surface (S14) is a point where the sign of the slope value with respect to the optical axis (OA) and the direction perpendicular to the optical axis (OA) changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. In addition, the critical point of the 14th surface (S14) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or a point where the slope value decreases and then increases.

[0249]

[0250] LensSurfaceRadiusThicknessndvdSemiApertureFocal length1S12.9111.4261.49783.6462.4008.007 S29.0210.358 2.259 Stopinfinity0.100 2.165 2S310.0330.3051.67119.2382.057-42.153 S47.3340.583 1.900 3 S5-25.6640.5271.54456.1151.86036.923S6-11.3720.040 1.880 4S710.2790.3601.67119.2381.950-63.788 S88.1870.597 2.182 5S9-192.1770.4031.58828.2692.538-66.424 S1049.4430.341 2.800 6S113.5740.6651.54456.1153.4487.704 S1222.2521.271 3.871 7S13-3.3200.5001.53455.6564.115-5.351 S1422.2050.399 4.731 FilterS15infinity0.210 5.849 S16infinity0.392 5.924 Image infinity0.009 6.130

[0251] Table 3 shows the surface number (Surface), radius of curvature (Radius), center thickness of each lens or distance between lens surfaces (Thickness), refractive index (Index,nd), Abbe number (Abbe,vd), effective radius (Semi Aperture), and focal length (Fcoal length) of the lens according to the second embodiment of the present invention. At this time, the unit of the radius of curvature and thickness or distance may be mm.

[0252]

[0253] Item ValueItem ValueF7.118ET10.409ΣIndex11.050ET20.421ΣAbbe318.277ET30.389ΣCT4.186ET40.311ΣCG3. 290ET50.345CA_max8.846ET60.410CA_min3.740ET70.792CA_Aver5.427F-number1.488CT_max1 .426FOV_D80.050CT_min0.305LG1_F9.218CT_Aver0.598LG2_F-60.440EPD4.784EG10.4222BFL1 .010EG20.1226TD7.875EG30.1051ImgH12.260EG40.5231SD6.091EG50.3707TTL8.486EG60.1796

[0254] Table 4 shows the items of the mathematical formulas described above in the optical system (1000) of the embodiment, including the total track length (TTL) (mm), back focal length (BFL), effective focal length (F) (mm), ImgH (mm), effective diameter (CA) (mm), thickness (mm), TTL (mm), the optical axis distance from the first surface (S1) to the fourteenth surface (S14) TD (mm), the optical axis distance from the aperture (Stop) to the fourteenth surface (S14) SD (mm), the sum of refractive indices, the sum of Abbe numbers, the sum of thicknesses (mm), the sum of spacings between adjacent lenses, the effective diameter characteristic, the diagonal angle of view (FOV_D) (Degree), the vertical angle of view (FOV_V) (Degree), the horizontal angle of view (FOV_H) (Degree), the edge thickness (ET), the F number, the edge spacing (EG) between edges, etc. of the optical system (1000). LG1_F is the composite focal length of the first lens group (LG1) (mm), and LG2_F is the composite focal length of the second lens group (LG2) (mm).

[0255]

[0256] The center thicknesses of the first to seventh lenses (201 to 207) are represented by CT1 to CT7, the edge thicknesses at the ends of the effective areas of each lens are represented by ET1 to ET7, the center gap between two adjacent lenses is represented by CG1 to CG6, and the edge gaps between the edges of each lens are represented by EG1 to EG7. The BFL (Back focal length) is the optical axis distance from the image sensor (300) to the center of the last lens. The TTL is the optical axis distance from the center of the first surface (S1) of the first lens (201) to the upper surface of the image sensor (300).

[0257] As shown in Fig. 9, among the lenses of the lens unit (200) in the second embodiment, the lens surfaces of the first to seventh lenses (201 to 207) may include aspherical surfaces having a 30th-order aspherical surface coefficient. For example, the first to seventh lenses (201 to 207) may include lens surfaces having a 30th-order aspherical surface coefficient. As described above, an aspherical surface having a 30th-order aspherical surface coefficient (a value other than "0") can significantly change the aspherical shape of the periphery, and thus can effectively correct the optical performance of the periphery of the field of view (FOV).

[0258] When comparing the absolute values ​​of the curvature radii of each lens, the curvature radii of the ninth surface (S9) of the fifth lens (205) on the optical axis (OA) may be the largest among the lenses, and the curvature radii of the first surface (S1) of the first lens (201) may be the smallest among the lenses. The difference between the maximum curvature radii and the minimum curvature radii may be 50 times or more, for example, 60 to 70 times. The curvature radii of the object-side surface of the first lens (201) may be the smallest among the lenses.

[0259] The absolute value of the curvature radius of the first surface (S1) of the first lens (201) may be smaller than the absolute value of the curvature radius of the second surface (S2). The absolute value of the curvature radius of the third surface (S3) of the second lens (202) may be larger than the absolute value of the curvature radius of the fourth surface (S4). The absolute value of the curvature radius of the fifth surface (S5) of the third lens (203) may be larger than the absolute value of the curvature radius of the sixth surface (S6). The absolute value of the curvature radius of the seventh surface (S7) of the fourth lens (204) may be larger than the absolute value of the curvature radius of the eighth surface (S8). The absolute value of the curvature radius of the ninth surface (S9) of the fifth lens (205) may be larger than the absolute value of the curvature radius of the tenth surface (S10). The absolute value of the radius of curvature of the eleventh surface (S11) of the sixth lens (206) may be smaller than the absolute value of the radius of curvature of the twelfth surface (S12). The absolute value of the radius of curvature of the thirteenth surface (S13) of the seventh lens (207) may be smaller than the absolute value of the radius of curvature of the fourteenth surface (S14).

[0260] The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0261] Condition 1: 0.1 < |L1R1 / L1R2| < 0.5

[0262] Condition 2: 1 < |L2R1 / L2R2| < 1.5

[0263] Condition 3: 2 < |L3R1 / L3R2| < 2.5

[0264] Condition 4: 1 < |L4R1 / L4R2| < 1.5

[0265] Condition 5: 3.5 < |L5R1 / L5R2| < 4

[0266] Condition 6: 0.1 < |L6R1 / L6R2| < 0.5

[0267] Condition 7: 0.1 < |L7R1 / L7R2| < 0.5

[0268]

[0269] When describing the central thickness of the lenses based on the optical axis, the central thickness (CT1) of the first lens (201) is the largest among the lenses, and the central thickness (CT2) of the second lens (202) is the smallest among the lenses. The difference between the maximum and minimum central thicknesses among the lenses may be in the range of 1 mm or more and 1.5 mm or less.

[0270] By setting the center thickness (CT1) of the first lens (201) closest to the object side in the optical system (1100) to the largest, the light path incident on the optical system (1100) is set, and good optical performance can be achieved at the set angle of view and focal length. The center thickness (CT1) of the first lens (201) is set to be larger than the center spacing of the sixth lens (206) and seventh lens (207), which have the largest center spacing among the spacings between adjacent lenses, so that a gentle light path can be formed at a short TTL, thereby forming a stable optical system.

[0271] The central thickness of each lens may satisfy any one of the conditions below.

[0272] Condition 1: CT1 > CT2, CT3, CT4, CT5, CT6, CT7

[0273] Condition 2: CT1, CT3, CT4, CT5, CT6, CT7 > CT2

[0274] Condition 3: CT1, CT6 > CT3 > CT2, CT4, CT5, CT7

[0275] Condition 4: CT1, CT3, CT5, CT6, CT7 > CT4 > CT2

[0276] Condition 5: CT1, CT3, CT6, CT7 > CT5 > CT2, CT4

[0277] Condition 6: CT1 > CT6 > CT2, CT3, CT4, CT5, CT7

[0278] Condition 7: CT1, CT3, CT6 > CT7 > CT2, CT4, CT5

[0279]

[0280] When describing the center spacing (CG) between the lenses, the center spacing (CG6) between the sixth lens (206) and the seventh lens (207) may be the maximum, and the center spacing (CG3) between the third and fourth lenses (203, 204) may be the minimum. The difference between the maximum center spacing and the minimum center spacing among the spaced lens spacings may be 1 mm or more, for example, in the range of 1 mm to 1.3 mm.

[0281] The distance (CG1) between the first lens (201) and the second lens (202), where the aperture is positioned, can be set to be greater than the distance (CG3) between the third lens (203) and the fourth lens (204), where the aperture is not positioned. This allows space for positioning the aperture within a short TTL, and minimizes interference with the operation of the aperture.

[0282] The center spacing between each lens can satisfy the conditions below.

[0283] Condition 1: CG2, CG4, CG6 > CG1 > CG3, CG5

[0284] Condition 2: CG4, CG6 > CG2 > CG1, CG3, CG5

[0285] Condition 3: CG1, CG2, CG4, CG5, CG6 > CG3

[0286] Condition 4: CG6 > CG4 > CG1, CG2, CG3, CG5

[0287] Condition 5: CG1, CG2, CG4, CG6 > CG5 > CG3

[0288] Condition 6: CG6 > CG1, CG2, CG3, CG4, CG5

[0289]

[0290] Regarding the effective diameter, the lens with the maximum effective diameter may be the seventh lens (207) closest to the image sensor (300). The lens with the maximum effective diameter may be a plastic lens. Here, the effective diameter is the average of the effective diameters on the object side and the sensor side of each lens. The lens surface with the maximum effective diameter may be the fourteenth surface (S14) of the seventh lens (207).

[0291] The lens having the minimum effective diameter may be any one of the plastic material lenses, and for example, the effective diameter of the third lens (203) may be the minimum within the lens unit (200). The lens surface having the minimum effective diameter may be the fifth surface (S5) of the third lens (203).

[0292] The effective diameter of each lens can satisfy any one of the conditions below.

[0293] Condition 1: CA_L5, CA_L6, CA_L7 > CA_L1 > CA_L2, CA_L3, CA_L4

[0294] Condition 2: CA_L1, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L2 > CA_L3

[0295] Condition 3: CA_L1, CA_L2, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L3

[0296] Condition 4: CA_L1, CA_L5, CA_L6, CA_L7 > CA_L4 > CA_L2, CA_L3

[0297] Condition 5: CA_L6, CA_L7 > CA_L5 > CA_L1, CA_L2, CA_L3, CA_L4

[0298] Condition 6: CA_L7 > CA_L6 > CA_L1, CA_L2, CA_L3, CA_L4, CA_L5

[0299] Condition 7: CA_L7 > CA_L1, CA_L2, CA_L3, CA_L4, CA_L5, CA_L6

[0300]

[0301] Regarding the refractive index, the refractive index of the second lens (202) may be the highest among the lenses and may be greater than 1.5, for example, greater than 1.6. The first lens (201) may have the lowest refractive index among the lenses. For example, the refractive index of the first lens (201) may be the lowest among the lenses and may be less than 1.55, for example, less than 1.5. The difference between the maximum refractive index and the minimum refractive index may be 0.1 or more.

[0302] The refractive index of each lens can satisfy any of the conditions below.

[0303] Condition 1: n2, n3, n4, n5, n6, n7 > n1

[0304] Condition 2: n2 = n4 > n1, n3, n5, n6, n7

[0305] Condition 3: n2, n4, n5 > n3 = n6 > n1, n7

[0306] Condition 4: n2, n4 > n5 > n1, n3, n6, n7

[0307] Condition 5: n2, n3, n4, n5, n6 > n7 > n1

[0308]

[0309] Comparing the Abbe numbers, the Abbe number of the first lens (201) is the largest among the lenses and may be 80 or more. The Abbe number of the second lens (202) is the smallest among the lenses and may be 20 or less. The difference between the maximum Abbe number and the minimum Abbe number may be 60 or more.

[0310] The Abbe number of each lens can satisfy any of the conditions below.

[0311] Condition 1: v1 > v2, v3, v4, v5, v6, v7

[0312] Condition 2: v1, v3, v4, v5, v6, v7 > v2

[0313] Condition 3: v1 > v3 = v6 > v2, v4, v5, v7

[0314] Condition 4: v1, v3, v5, v6, v7 > v4 > v2

[0315] Condition 5: v1, v3, v6, v7 > v5 > v2, v4

[0316]

[0317] The focal lengths (F2, F4, F5, F7) of the 2nd, 4th, 5th, and 7th lenses (202, 204, 205, and 207) may have negative (-) signs. The 2nd, 4th, 5th, and 7th lenses (202, 204, 205, and 207) may have negative (-) refractive power. The focal lengths (F1, F3, F6) of the 1st, 3rd, and 6th lenses (201, 203, and 206) may have positive (+) signs. The 1st, 3rd, and 6th lenses (201, 203, and 206) may have positive (+) refractive power.

[0318] When comparing the focal lengths in absolute values, the focal length of the fifth lens (205) is the largest among the lenses, and may be 60 or more and 80 or less. Among the lenses, the fifth lens (205) made of plastic may have the largest focal length and the smallest refractive power. The focal length of the seventh lens (207) is the smallest among the lenses, and the absolute value of the focal length of the seventh lens (207) may be 5 or more and 10 or less. Among the lenses, the seventh lens (207) made of plastic may have the smallest focal length and the largest refractive power.

[0319] Among the lenses, the lens having the minimum focal length may be the seventh lens (207). The difference between the maximum focal length and the minimum focal length may be 50 or more or 60 or more. Accordingly, the optical system may have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. in the set angle of view range, and may have good optical performance in the periphery of the angle of view.

[0320] The absolute value of the focal length of each lens can satisfy any of the conditions below.

[0321] Condition 1: |f2|, |f3|, |f4|, |f5| > |f1| > |f6|, |f7|

[0322] Condition 2: |f4|, |f5| > |f2| > |f1|, |f3|, |f6|, |f7|

[0323] Condition 3: |f2|, |f4|, |f5| > |f3| > |f1|, |f6|, |f7|

[0324] Condition 4: |f5| > |f4| > |f1|, |f2|, |f3|, |f6|, |f7|

[0325] Condition 5: |f5| > |f1|, |f2|, |f3|, |f4|, |f6|, |f7|

[0326] Condition 6: |f1|, |f2|, |f3|, |f4|, |f5| > |f6| > |f7|

[0327] Condition 7: |f1|, |f2|, |f3|, |f4|, |f5|, |f6| > |f7|

[0328]

[0329] The thickness (T1) of the first lens (201) may be minimum at the edge and maximum at the center, and the maximum thickness is in the range of 3 to 4 times the minimum thickness. The thickness (T2) of the second lens (202) may be maximum at the edge and minimum at the center, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T3) of the third lens (203) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T4) of the fourth lens (204) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T5) of the fifth lens (205) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T6) of the sixth lens (206) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1.5 to 2 times the minimum thickness. The thickness (T7) of the seventh lens (207) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 1.5 to 2 times the minimum thickness.

[0330] The thickness of each lens can satisfy any of the conditions below.

[0331] Condition 1: 3 < CT1 / ET1 < 3.5, 0.1 < ET1 / CT1 < 0.5

[0332] Condition 2: 0.5 < CT2 / ET2 < 1, 1 < ET2 / CT2 < 1.5

[0333] Condition 3: 1 < CT3 / ET3 < 1.5, 0.5 < ET3 / CT3 < 1

[0334] Condition 4: 1 < CT4 / ET4 < 1.5, 0.5 < ET4 / CT4 < 1

[0335] Condition 5: 1 < CT5 / ET5 < 1.5, 0.5 < ET5 / CT5 < 1

[0336] Condition 6: 1.5 < CT6 / ET6 < 2, 0.5 < ET6 / CT6 < 1

[0337] Condition 7: 0.5 < CT7 / ET7 < 1, 1.5 < ET7 / CT7 < 2

[0338] Condition 8: 1 < ΣCT / ΣET < 1.5, 0.5 < ΣET / ΣCT < 1

[0339]

[0340] Among the gaps (G1-G6) between the lenses, the first gap (G1) between the first and second lenses (201, 202) may have a maximum in the center and a minimum in the edge. The second gap (G2) between the second and third lenses (202, 203) may have a minimum in the edge and a maximum in the center. The third gap (G3) between the third and fourth lenses (203, 204) may have a maximum in the edge and a minimum in the center. The fourth gap (G4) between the fourth and fifth lenses (204, 205) may have a maximum in the edge and a minimum in the center. The fifth gap (G5) between the fifth and sixth lenses (205, 206) may have a minimum in the center and a maximum in the edge. The sixth gap (G6) between the sixth and seventh lenses (206, 207) may have a maximum in the center and a minimum in the edge.

[0341]

[0342]

[0343] The optical systems (1000, 1100) according to the first and second embodiments disclosed above can satisfy at least one or two or more of the mathematical equations described below. Accordingly, the optical systems (1000, 1100) according to the first and second embodiments can have improved optical characteristics. For example, when the optical system (1000, 1100) satisfies at least one mathematical equation, the optical system (1000, 1100) can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only at the center but also at the periphery of the field of view (FOV). In addition, the optical system (1000, 1100) can have improved resolution. In addition, the thickness of the lens on the optical axis (OA) described in the mathematical equations and the spacing between adjacent lenses on the optical axis (OA) can refer to the first and second embodiments disclosed above.

[0344]

[0345] [Mathematical Formula 1]

[0346] 0.5 < L1R2 / L2R1< 1

[0347] In mathematical expression 1, L1R2 is the radius of curvature of the sensor-side surface (second surface (S2)) of the first lens (101, 201), and L321 is the radius of curvature of the object-side surface (third surface (S3)) of the second lens (102, 202). When mathematical expression 1 is satisfied, the aperture (STOP) is arranged between the first lens (101, 201) and the second lens (102, 202), and the shapes of the lens surfaces facing the aperture (STOP) can be formed similarly. Through this, the driving interference of the aperture (STOP) can be minimized. When it is less than the lower limit of mathematical expression 1, it is difficult to arrange the aperture (STOP) and the aperture driving device between the lenses, and when it exceeds the upper limit of mathematical expression 1, the lenses may have long effective diameters or TTLs, which may cause a problem in that the imaging lens system becomes larger. In the first and second embodiments, mathematical expression 1 can preferably satisfy 0.8 < L1R2 / L2R1 < 1.

[0348]

[0349] [Equation 2]

[0350] 2 < CT1 / CG1 < 4

[0351] In mathematical expression 2, CT1 is the center thickness of the first lens (101, 201), and CG1 is the center spacing between the first lens (101, 201) and the second lens (102, 202). When mathematical expression 2 is satisfied, the center spacing between the first lens (101, 201) and the second lens (102, 202) where the diaphragm (STOP) is arranged can be appropriately set. When it is less than the lower limit of mathematical expression 1, it is difficult to arrange the diaphragm (STOP) and the diaphragm driving device between the lenses, and when it exceeds the upper limit of mathematical expression 1, the lenses may have long effective diameters or TTLs, which may cause a problem in that the imaging lens system becomes large. In the first and second embodiments, mathematical expression 2 may preferably satisfy 2.5 < CT2 / CG2 < 3.5.

[0352]

[0353] [Equation 3]

[0354] 0.3 < EG1 < 1

[0355] In mathematical expression 3, EG1 is the edge gap between the first lens (101, 201) and the second lens (102, 202). EG1 may mean the distance between the effective aperture end of the sensor-side (second surface (S2)) of the first lens (101, 201) and the effective aperture end of the object-side (third surface (S3)) of the second lens (102, 202). When mathematical expression 3 is satisfied, the space for arranging the aperture (STOP) can be secured by appropriately designing the gap between adjacent lenses, and the driving interference of the aperture (STOP) can be minimized. When it is less than the lower limit of mathematical expression 3, it is difficult to arrange the aperture (STOP) and the aperture driving device between the lenses, and when it exceeds the upper limit of mathematical expression 3, the lenses may have long effective apertures or TTLs, which may cause a problem of the imaging lens system becoming larger. In the first and second embodiments, mathematical expression 3 can preferably satisfy 0.4 < EG1 < 0.6.

[0356]

[0357] [Equation 4]

[0358] 1 < EG1 / CG1 < 1.5

[0359] In mathematical expression 4, EG1 is the edge spacing between the first lens (101, 201) and the second lens (102, 202), and CG1 is the center spacing between the first lens (101, 201) and the second lens (102, 202). When mathematical expression 4 is satisfied, the spacing between adjacent lenses can be appropriately designed to secure space for diaphragm (STOP) arrangement, and the driving interference of the diaphragm (STOP) can be minimized. When it is less than the lower limit of mathematical expression 3, it is difficult to arrange the diaphragm (STOP) and the diaphragm driving device between the lenses, and when it is more than the upper limit of mathematical expression 3, the lenses may have long effective diameters or TTLs, which may cause a problem of the imaging lens system becoming larger. In the first and second embodiments, mathematical expression 4 may preferably satisfy 1 < EG2 / CG2 < 1.3.

[0360]

[0361] [Equation 5]

[0362] 0.1 < CT1 / ΣCT < 0.5

[0363] In mathematical expression 5, CT1 is the central thickness of the first lens (101, 201), and ΣCT is the sum of the central thicknesses of the lenses. When mathematical expression 5 is satisfied, the light emitted from the first lens (101, 201), which is adjacent to the aperture (STOP) and has a large influence in the entire optical system, sets an optical path that is incident on the remaining lenses, and the optical system can have good optical performance at the set angle of view and focal length. In the first and second embodiments, mathematical expression 5 can preferably satisfy 0.3 < CT2 / ΣCT < 0.4.

[0364]

[0365] [Equation 6]

[0366] 0.01 < CT2 / ΣCT < 0.09

[0367] In mathematical expression 6, CT2 is the central thickness of the second lens (102, 202), and ΣCT is the sum of the central thicknesses of the lenses. When mathematical expression 6 is satisfied, the light emitted from the second lens (102, 202), which is adjacent to the aperture (STOP) and has a large influence in the entire optical system, sets an optical path that is incident on the remaining lenses, and the optical system can have good optical performance at the set angle of view and focal length. In the first and second embodiments, mathematical expression 6 can preferably satisfy 0.05 < CT3 / ΣCT < 0.08.

[0368]

[0369] [Equation 7]

[0370] 0.1 < CG1 / ΣCG < 0.2

[0371] In mathematical expression 7, CG1 is the center spacing between the first lens (101, 201) and the second lens (102, 202), and ΣCG is the sum of the spacings between adjacent lenses. When mathematical expression 7 is satisfied, the spacing between adjacent lenses can be appropriately designed to secure space for diaphragm (STOP) arrangement, and the driving interference of the diaphragm (STOP) can be minimized. When it is less than the lower limit of mathematical expression 7, it is difficult to arrange the diaphragm (STOP) and the diaphragm driving device between the lenses, and when it is more than the upper limit of mathematical expression 7, the lenses may have long effective diameters or TTLs, which may cause a problem of the imaging lens system becoming larger. In the first and second embodiments, mathematical expression 7 can preferably satisfy 0.12 < CG2 / ΣCG < 0.18.

[0372]

[0373] [Equation 8]

[0374] 0.01 < |LG1_F / LG2_F| < 0.5

[0375] In mathematical expression 8, LG1_F is the composite focal length of the first lens group (LG1), and LG2_F is the composite focal length of the second lens group (LG2). When mathematical expression 8 is satisfied, the light path incident on the entire optical system is set, and the optical system can have good optical performance at the set angle of view and focal length. In the first and second embodiments, mathematical expression 8 can preferably satisfy 0.05 < |LG1_F / LG2_F| < 0.2.

[0376]

[0377] [Equation 9]

[0378] 0.1 < F / TTL < 1

[0379] In mathematical expression 9, F is the effective focal length of the optical system, and TTL (Total track length) means the distance (mm) on the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101, 201) to the upper surface of the image sensor (300). When mathematical expression 9 is satisfied, the optical system (1000, 1100) can have an appropriate focal length in the set TTL range. When it is less than the lower limit of mathematical expression 9, the refractive power of the lenses needs to be increased, making it difficult to correct spherical aberration or distortion aberration, and when it is more than the upper limit of mathematical expression 9, the effective diameter or TTL of the lenses may become long, which may cause a problem in that the imaging lens system becomes large. In the first and second embodiments, mathematical expression 9 can preferably satisfy 0.6 < F / TTL < 0.9.

[0380]

[0381] [Equation 10]

[0382] 0.1 < TTL / ImgH < 1

[0383] In mathematical expression 10, TTL (Total track length) means the distance (mm) from the vertex of the first surface (S1) of the first lens (101, 201) to the upper surface of the image sensor (300) on the optical axis (OA), and ImgH means the maximum diagonal length of the image sensor (300). When mathematical expression 10 is satisfied, the optical system (1000, 1100) can have TTL for application to the image sensor (300), and can provide more improved image quality. When it is less than the lower limit of mathematical expression 10, the refractive power of the lenses needs to be increased, making it difficult to correct spherical aberration or distortion aberration, and when it is more than the upper limit of mathematical expression 10, the effective diameter or TTL of the lenses becomes long, which may cause a problem of the imaging lens system becoming larger. In the first and second embodiments, mathematical expression 10 can preferably satisfy 0.5 < TTL / ImgH < 0.8.

[0384]

[0385] [Equation 11]

[0386] 1 < F1 / F < 2

[0387] In mathematical expression 11, F1 is the focal length of the first lens (101, 201), and F is the effective focal length of the optical system. When mathematical expression 11 is satisfied, the optical system (1000, 1100) can have a set angle of view and an appropriate focal length. In addition, the angle of view can be set to be large in an appropriate TTL range through the first lens (101, 201) having positive (+) refractive power. When it is below the lower limit of mathematical expression 11, the effective diameter or TTL of the lenses may become long, which may cause a problem in that the imaging lens system becomes large. When it is above the upper limit of mathematical expression 11, the influence of the first lens (101, 201) on the entire optical system becomes small, and the refractive power of the lenses needs to be increased, which causes a problem in that it is difficult to correct spherical aberration or distortion aberration. In the first and second embodiments, mathematical expression 11 can preferably satisfy 1 < F1 / F < 1.3.

[0388]

[0389] [Equation 12]

[0390] 2 < |F2| / F < 7

[0391] In mathematical expression 12, F2 is the focal length of the second lens (102, 202), and F is the effective focal length of the optical system. When mathematical expression 12 is satisfied, the optical system (1000, 1100) can have a set angle of view and an appropriate focal length. When it is less than the lower limit of mathematical expression 12, the effective diameter or TTL of the lenses may become long, which may cause a problem of the large size of the imaging lens system. When it is more than the upper limit of mathematical expression 12, the influence of the second lens (102, 202) in the entire optical system becomes small, and the refractive power of the lenses needs to be increased, which causes a problem of difficulty in correcting spherical aberration or distortion aberration. In the first and second embodiments, mathematical expression 12 may preferably satisfy 4 < |F2| / F < 6.

[0392]

[0393] [Equation 13]

[0394] 3 < |F3| / F < 10

[0395] In mathematical expression 13, F3 is the focal length of the third lens (103, 203), and F is the effective focal length of the optical system. When mathematical expression 13 is satisfied, the optical system (1000, 1100) can have a set angle of view and an appropriate focal length. When it is less than the lower limit of mathematical expression 13, the effective diameter or TTL of the lenses may become long, which may cause a problem of the large size of the imaging lens system. When it is more than the upper limit of mathematical expression 13, the influence of the third lens (103, 203) in the entire optical system becomes small, and the refractive power of the lenses needs to be increased, which causes a problem of difficulty in correcting spherical aberration or distortion aberration. In the first and second embodiments, mathematical expression 13 may preferably satisfy 4 < |F3| / F < 6.

[0396]

[0397] [Equation 14]

[0398] 0.1 < |F7| / F < 1

[0399] In mathematical expression 14, F7 is the focal length of the seventh lens (107, 207), and F is the effective focal length of the optical system. When mathematical expression 14 is satisfied, aberration characteristics can be secured, and a stable optical system can be formed by forming a gentle optical path at a short TTL. When it is below the lower limit of mathematical expression 14, the effective diameter or TTL of the lenses may become long, which may cause a problem of the large size of the imaging lens system. When it is above the upper limit of mathematical expression 14, the influence of the seventh lens (107, 207) in the entire optical system becomes small, and the refractive power of the lenses needs to be increased, which causes a problem of difficulty in correcting spherical aberration or distortion aberration. In the first and second embodiments, mathematical expression 14 may preferably satisfy 0.5 < |F8| / F < 0.8.

[0400]

[0401] [Equation 15]

[0402] 1.2 < n1 < 1.7

[0403] In mathematical expression 15, n1 is the refractive index of the first lens (101, 201). When mathematical expression 15 is satisfied, chromatic aberration can be minimized by having a high refractive index of the first lens (101, 201) arranged closest to the object side in the optical system (1000, 1100). In the first and second embodiments, mathematical expression 15 can preferably satisfy 1.45 < n1 < 1.55.

[0404]

[0405] [Equation 16]

[0406] 1 < CT_Max / CG_Max < 2

[0407] In Equation 16, CT_Max is the maximum central thickness among the lenses, and CG_Max is the maximum gap between adjacent lenses. When Equation 16 is satisfied, the optical system can have good optical performance at a focal length at a set angle of view, and can reduce TTL. In the first and second embodiments, Equation 16 can preferably satisfy 1 < CT_Max / CG_Max < 1.2.

[0408]

[0409] [Equation 17]

[0410] 2 < CA_max / CA_min < 5

[0411] In mathematical expression 17, CA_max represents the maximum effective diameter among the object-side and sensor-side surfaces of the lenses, and CA_Min represents the minimum effective diameter among the object-side and sensor-side surfaces of the lenses. When mathematical expression 17 is satisfied, the optical system can set a size for a slim and compact structure while maintaining optical performance. In the first and second embodiments, mathematical expression 17 can preferably satisfy 2.1 < CA_max / CA_min < 2.5.

[0412]

[0413] [Equation 18]

[0414] 0.1 < ΣCG / ΣCT < 1

[0415] In mathematical expression 18, ΣCT is the sum of the central thicknesses of the lenses, and ΣCG is the sum of the spacings between adjacent lenses. When mathematical expression 18 is satisfied, the optical system can have good optical performance at the focal length at the set angle of view, and can reduce the TTL. In the first and second embodiments, mathematical expression 18 can preferably satisfy 0.5 < ΣCG / ΣCT < 0.8.

[0416]

[0417] [Equation 19]

[0418] 0.1 < CA_L1 / F < 1

[0419] In mathematical expression 19, CA_L1 is the effective diameter of the first lens (101, 201), and F is the effective focal length of the optical system. If it is less than the lower limit of mathematical expression 19, the effective diameter of the lens arranged in the optical system (1000, 1100) becomes the largest, which causes a problem in that the TTL becomes long. If it exceeds the upper limit of mathematical expression 19, there is a problem in that the angle of view becomes excessively larger than that satisfied by the optical system (1000, 1100). In the first and second embodiments, mathematical expression 19 can preferably satisfy 0.5 < CA_L1 / F < 0.7.

[0420]

[0421] [Equation 20]

[0422] 1 < F / EPD < 2

[0423] In mathematical expression 20, F represents the effective focal length of the optical system, and EPD represents the diameter of the entrance pupil (effective aperture). When mathematical expression 20 is satisfied, an image with an appropriate brightness can be provided, and a large amount of light can be received by the image sensor. In the first and second embodiments, mathematical expression 20 preferably satisfies 1.2 < F / EPD < 1.6.

[0424]

[0425] [Equation 21]

[0426] 0.1 < BFL / TTL < 0.5

[0427] In mathematical expression 21, BFL means the optical axis distance from the image sensor (300) to the center of the sensor side of the last lens, and TTL (Total track length) means the distance (mm) on the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101, 201) to the upper surface of the image sensor (300). When mathematical expression 21 is satisfied, the optical system (1000, 1100) can have a set angle of view and an appropriate focal length, and an optical system for a vehicle can be provided. In addition, the optical system (1000, 1100) can minimize the gap between the last lens and the image sensor (300), and thus can have good optical characteristics at the periphery of the field of view (FOV). In the first and second embodiments, mathematical expression 21 can preferably satisfy 0.1 < BFL / TTL < 0.2.

[0428]

[0429] [Equation 22]

[0430] 50 < FOV_D < 100

[0431] In mathematical expression 22, FOV_D represents the diagonal angle of view (Degree) of the optical system (1000, 1100), and can provide an angle of view suitable for a mobile optical system. In the first and second embodiments, preferably, 70 < FOV_D < 90 can be satisfied.

[0432]

[0433] [Equation 23]

[0434] 0.5 < TTL / CA_max < 1

[0435] In mathematical expression 23, TTL (Total track length) means the distance (mm) from the vertex of the first surface (S1) of the first lens (101, 201) to the upper surface of the image sensor (300) on the optical axis (OA), and CA_max represents the maximum effective diameter among the object-side surfaces and the sensor-side surfaces of the lenses. When mathematical expression 23 is satisfied, the optical system can maintain good optical performance and set a size for a slim and compact structure. In the first and second embodiments, mathematical expression 23 can preferably satisfy 0.8 < TTL / CA_max < 1.

[0436]

[0437] [Equation 24]

[0438] 5 < TTL < 10

[0439] In mathematical expression 24, TTL (Total track length) means the distance (mm) from the center of the first surface (S1) of the first lens (101, 201) to the upper surface of the image sensor (300) on the optical axis (OA). When mathematical expression 24 is satisfied, a suitable mobile optical system can be provided. In the first and second embodiments, mathematical expression 24 can preferably satisfy 6 < TTL < 9.

[0440]

[0441] [Equation 25]

[0442] 10 < ImgH < 20

[0443] Mathematical expression 25 indicates that ImgH represents the maximum diagonal length of the image sensor (300). Mathematical expression 25 can set the diagonal size of the image sensor (300) and provide an optical system having a mobile sensor size. In the first and second embodiments, Mathematical expression 25 preferably satisfies 10 < ImgH < 13.

[0444]

[0445] [Equation 26]

[0446] 1 < BFL < 2

[0447] In mathematical expression 26, BFL is the optical axis distance from the image sensor (300) to the center of the sensor side of the last lens. When mathematical expression 26 is satisfied, the installation space of the filter (400) and the cover glass can be secured, the assembling of the components can be improved through the gap between the image sensor (300) and the last lens, and the joining reliability can be improved. When the BFL is less than the range of mathematical expression 26, some of the light traveling to the image sensor may not be transmitted to the image sensor, which may cause a decrease in resolution. When the BFL exceeds the range of mathematical expression 26, stray light may be introduced, which may deteriorate the aberration characteristics of the optical system. In the first and second embodiments, mathematical expression 26 may preferably satisfy 1 < BFL < 1.2.

[0448]

[0449] [Equation 27]

[0450] 5 < F < 10

[0451] Mathematical expression 27 can set the overall focal length (F) to suit the mobile optical system. In the first and second embodiments, mathematical expression 27 can preferably satisfy 6 < F < 7.

[0452]

[0453] [Equation 28]

[0454]

[0455] In mathematical expression 28, Z can represent Sag, which is the distance from any position on the aspherical surface to the vertex of the aspherical surface in the direction of the optical axis. Y can represent the distance from any position on the aspherical surface to the optical axis in the direction perpendicular 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 aspheric constants.

[0456]

[0457] The optical system (1000, 1100) according to the first and second embodiments can satisfy at least one or two or more mathematical expressions from mathematical expressions 1 to 27. In this case, the optical system (1000, 1100) can have improved optical characteristics. Specifically, when the optical system (1000, 1100) satisfies at least one or two or more mathematical expressions from mathematical expressions 1 to 27, the optical system (1000, 1100) can have improved resolution and improve aberration and distortion characteristics. In addition, the optical system (1000, 1100) can secure a BFL (Back focal length) for applying a vehicle image sensor (300), can compensate for optical characteristic degradation due to temperature change, and can minimize the gap between the last lens and the image sensor (300), thereby having good optical performance at the center and periphery of the field of view (FOV).

[0458]

[0459] Table 5 shows the result values ​​for the mathematical expressions 1 to 26 described above in the optical system (1000, 1100) of the embodiment. Referring to Table 5, it can be seen that the optical system (1000, 1100) satisfies at least one, two or more, or three or more of the mathematical expressions 1 to 26. In detail, it can be seen that the optical system (1000, 1100) according to the embodiment satisfies all of the mathematical expressions 1 to 26. Accordingly, the optical system (1000, 1100) can have good optical performance and excellent optical characteristics at the center and periphery of the field of view (FOV).

[0460] Mathematical Formula Example 1 Example 2 10.5 < L1R2 / L2R1 < 10.97230.899222 < CT1 / CG1 < 42.57193.111530.3 < EG1 < 10.51740.422241 < EG1 / CG1 < 1.51.29101.032350.1 < CT1 / ΣCT < 0.50.31900.340760.01 < CT2 / ΣCT < 0.090.06820.072870.1 < CG1 / ΣCG < 0.20.16750.139380.01 < |LG1_F / LG2_F| < 0.50.08900.152590.1 < F / TTL < 10.82040.8387100.1 < TTL / ImgH < 10.70960.6922111 < F1 / F < 21.13431.1250122 < |F2| / F < 75.24745.9223133 < |F3| / F < 104.41125.1875140.1 < |F7| / F < 10.70660.7519151.2 < n1 < 1.71.49701.4970161 < CT_Max / CG_Max < 21.17801.1223172 < CA_max / CA_min < 52.46272.3653180.1 < ΣCG / ΣCT < 10.74050.7860190.1 < CA_L1 / F < 10.66090.6546201 < F / EPD < 21.48071.4879210.1 < BFL / TTL < 0.50.12060.11912250 < FOV_D < 10080.070080.0500230.5 < TTL / CA_max < 10.93540.9593245 < TTL < 108.69998.48622510 < ImgH < 2012.260012.2600261 < BFL < 21.04901.0103275 < F < 107.13807.1176

[0461] Hereinafter, a camera module according to an embodiment of the present invention will be described with reference to the drawings.

[0462] Figure 15 is an exploded perspective view of a camera device according to an embodiment of the present invention.

[0463] The camera device (10A) may include a camera module.

[0464] The camera device (10A) may include a lens module (20). The lens module (20) may include at least one lens. The lens may be positioned corresponding to the image sensor (300). The lens module (20) may include a lens and a barrel. The lens module (20) may be coupled to a bobbin (210) of a lens driving device (10B). The lens module (20) may be coupled to the bobbin (210) by screw coupling and / or adhesive. The lens module (20) may move integrally with the bobbin (210).

[0465] The camera device (10A) may include a filter (30). The filter (30) may block light of a specific frequency band from passing through the lens module (20) from being incident on the image sensor (300). The filter (30) may be arranged parallel to the xy plane. The filter (30) may be arranged between the lens module (20) and the image sensor (300). The filter (30) may be arranged on the sensor base (40). Alternatively, the filter (30) may be arranged on the base of the lens driving device (10B). The filter (30) may include an infrared filter. The infrared filter may block light in the infrared region from being incident on the image sensor (300).

[0466] 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 a filter (30) is disposed. An opening may be formed in the portion of the sensor base (40) on which the filter (30) is disposed so that light passing through the filter (30) may be incident on the image sensor (300). The adhesive member (45) may couple or adhere the base (410) of the lens driving device (10B) to the sensor base (40). The adhesive member (45) may additionally serve to prevent foreign substances from entering the interior of the lens driving device (10B). The adhesive member (45) may include at least one of an epoxy, a thermosetting adhesive, and an ultraviolet-curable adhesive.

[0467] The camera device (10A) may include a printed circuit board (50) (PCB, Printed Circuit Board). The printed circuit board (50) may be a substrate or a circuit board. A lens driving device (10B) may be disposed on the printed circuit board (50). A 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). An image sensor (300) may be disposed on the printed circuit board (50). Various circuits, elements, control units, etc. may be provided on the printed circuit board (50) to convert an image formed on the image sensor (300) into an electrical signal and transmit it to an external device.

[0468] The camera device (10A) may include an image sensor (300). The image sensor (300) may be configured to form an image by incident light passing through a lens and a filter (30). The image sensor (300) may be mounted on a printed circuit board (50). The image sensor (300) may be electrically connected to the printed circuit board (50). For example, the image sensor (300) may be coupled to the printed circuit board (50) using surface mounting technology (SMT). As another example, the image sensor (300) may be coupled to the printed circuit board (50) using flip chip technology. The image sensor (300) may be arranged such that its optical axis is aligned with that of the lens. That is, the optical axis of the image sensor (300) and the optical axis of the lens may be aligned. The image sensor (300) can convert light irradiated onto the effective image area of ​​the image sensor (300) into an electrical signal. The image sensor (300) can be any one of a CCD (charge coupled device), a MOS (metal oxide semi-conductor), a CPD, and a CID.

[0469] The camera device (10A) may include a motion sensor (70). The motion sensor (70) may be mounted on a printed circuit board (50). The motion sensor (70) may be electrically connected to a control unit (80) through a circuit pattern provided on the printed circuit board (50). The motion sensor (70) may output rotational angular velocity information due to the movement of the camera device (10A). The motion sensor (70) may include a two-axis or three-axis gyro sensor or an angular velocity sensor.

[0470] The camera device (10A) may include a control unit (80). The control unit (80) may be disposed on a printed circuit board (50). The control unit (80) may be electrically connected to the AF coil and the OIS coil of the lens driving device (10B). The control unit (80) may individually control the direction, intensity, amplitude, etc. of the current supplied to the AF coil and the OIS coil. The control unit (80) may control the lens driving device (10B) to perform an autofocus function and / or an image stabilization function. Furthermore, the control unit (80) may perform autofocus feedback control and / or image stabilization feedback control for the lens driving device (10B).

[0471] The camera device (10A) may include a connector (90). The connector (90) may be electrically connected to a printed circuit board (50). The connector (90) may include a port for electrically connecting to an external device.

[0472]

[0473] The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to just one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by those skilled in the art to which the embodiments pertain. Therefore, the contents related to such combinations and modifications should be construed as falling within the scope of the present invention.

[0474] In addition, although the above description focuses on examples, these are merely examples and do not limit the present invention. Those skilled in the art to which the present invention pertains will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the examples can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention defined in the appended claims.

Claims

1. Including first to seventh lenses arranged along the optical axis, The above first lens has positive (+) refractive power, The above second lens has negative (-) refractive power, The above fifth lens has a negative (-) refractive power, The above sixth lens has positive (+) refractive power, The above seventh lens has a negative (-) refractive power, An optical system in which the distance between the first lens and the second lens on the optical axis is greater than the distance between the third lens and the fourth lens.

2. In paragraph 1, An optical system in which the thickness of the first lens on the optical axis is greater than the distance between the sixth lens and the seventh lens.

3. In paragraph 1, The above third lens is an optical system having a convex meniscus shape toward the sensor.

4. In paragraph 1, The above fourth lens is an optical system having a meniscus shape convex toward the object side.

5. In paragraph 1, An optical system in which the sign of the curvature radius of the sensor side of the first lens and the sign of the curvature radius of the object side of the second lens are the same.

6. In paragraph 1, The above third lens has positive (+) refractive power, The above fourth lens is an optical system having negative (-) refractive power.

7. In any one of paragraphs 1 to 6, An optical system that satisfies the following conditions. <Conditional expression> 5 < TTL < 10 (In the above conditional expression, TTL means the distance on the optical axis from the object side of the first lens to the upper surface of the image sensor.) 8. In any one of paragraphs 1 to 6, An optical system that satisfies the following conditions. <Conditional expression> 0.1 < ΣCG / ΣCT < 1 (In the above conditional expression, ΣCT is the sum of the central thicknesses of the lenses, and ΣCG is the sum of the spacings between adjacent lenses.) 9. Including the first to seventh lenses arranged along the optical axis, The above first lens has positive (+) refractive power, The above second lens has negative (-) refractive power, The above third lens has positive (+) refractive power, An optical system in which the thickness of the first lens on the optical axis is greater than the distance between the sixth lens and the seventh lens.

10. In paragraph 9, An optical system in which the sign of the curvature radius of the sensor side of the first lens and the sign of the curvature radius of the object side of the second lens are the same.

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