Optical system and camera module

Abstract

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

Description

Optical system and camera module

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

[0002] Recently, regarding image pick-up systems, camera modules for communication terminals, digital still cameras (DSCs), camcorders, and PC cameras (imaging devices attached to personal computers) are being researched. One of the most important components for a camera module related to such an image pick-up system to obtain an image is the imaging lens that forms the image.

[0003] Portable terminals, such as mobile phones or automotive cameras, are increasingly becoming smaller and / or lighter. In line with this trend, imaging lenses are also becoming smaller. In addition, along with making imaging lenses smaller, there is a demand for high-performance imaging lenses to keep up with the increased performance of light-receiving elements.

[0004] The present invention aims to provide an optical system and a camera module with improved optical characteristics.

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

[0006] In addition, we aim to provide an imaging lens with excellent aberration characteristics and good aberration correction capabilities.

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

[0008] The size of the effective diameter of the second lens may be smaller than the size of the effective diameter of the seventh lens.

[0009] In the above optical axis, the third lens may have a shape with both sides convex.

[0010] The distance between the second lens and the third lens on the above optical axis may be greater than the thickness of the third lens.

[0011] The third lens may have a positive (+) refractive power, the fourth lens may have a positive (+) refractive power, and the fifth lens may have a negative (-) refractive power.

[0012] The following condition can be satisfied. <Condition> 30 < ImgH < 40 (In the above condition, ImgH represents the maximum diagonal length of the image sensor.)

[0013] The following conditional equation may be satisfied. <Conditional Equation> 1 < TTL / ImgH < 3 (In the above conditional equation, TTL refers to the distance from the object side of the first lens to the top plane of the image sensor along the optical axis, and ImgH refers to the maximum diagonal length of the image sensor.)

[0014] The following condition can be satisfied. <Condition> 5 < CA_max / CA_min < 7 (In the above condition, CA_max refers to the maximum effective diameter among the object sides and sensor sides of the lenses, and CA_Min refers to the minimum effective diameter among the object sides and sensor sides of the lenses.)

[0015] To solve the above technical problem, the optical system according to the present embodiment includes a first to seventh lens arranged along an optical axis, wherein the first lens has a negative (-) refractive power, the second lens has a negative (-) refractive power, the third lens has a positive (+) refractive power, the fourth lens has a positive (+) refractive power, the fifth lens has a negative (-) refractive power, and the size of the effective aperture of the second lens may be smaller than the size of the effective aperture of the seventh lens.

[0016] In the above optical axis, the third lens may have a shape with both sides convex.

[0017] The size of the effective diameter of the third lens may be smaller than the size of the effective diameter of the fifth lens.

[0018] The distance between the third lens and the fourth lens on the optical axis may be smaller than the distance between the fifth lens and the sixth lens.

[0019] The following condition can be satisfied. <Condition> 1.5 < n5 < 1.7 (In the above condition, n5 represents the refractive index of the fifth lens at the d-line.)

[0020] The following conditional equation may be satisfied. <Conditional Equation> 0.1 < F / TTL < 0.5 (In the above conditional equation, F represents the effective focal length of the optical system, and TTL represents the distance from the object side of the first lens to the top plane of the image sensor along the optical axis.)

[0021] The following condition can be satisfied. <Condition> 40 < TTL < 50 (In the above condition, TTL refers to the distance from the object side of the first lens to the top plane of the image sensor along the optical axis.)

[0022] The optical system and camera module according to the embodiment may have enhanced optical characteristics. Specifically, in the optical system according to the embodiment, a plurality of lenses may have a set thickness, refractive power, and spacing from adjacent lenses. Accordingly, the optical system and camera module according to the embodiment may have enhanced MTF characteristics, aberration control characteristics, resolution characteristics, etc., within a set angle of view range, and may have good optical performance at the periphery of the angle of view.

[0023] In addition, the optical system and camera module according to the embodiment can satisfy a set angle of view and realize excellent optical characteristics. As a result, the optical system can provide a slimmer camera module. Therefore, the optical system and camera module can be provided for various applications and devices.

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

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

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

[0027] Figure 4 is a graph showing data on the aberration characteristics of the optical system of Figure 1 at room temperature.

[0028] FIG. 5 is a side cross-sectional view of an optical system according to a second embodiment and a camera module having the same.

[0029] Figure 6 is a table showing the aspherical coefficients of the aspherical lenses in the optical system of Figure 5.

[0030] Figure 7 is a table showing the Sag values ​​of the lens surfaces of the first to seventh lenses in the optical system of Figure 5.

[0031] Figure 8 is a graph showing data on the aberration characteristics of the optical system of Figure 5 at room temperature.

[0032] FIG. 9 is an exploded perspective view of a camera module according to the present embodiment.

[0033] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0034] However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted.

[0035] In addition, terms used in this embodiment (including technical and scientific terms) may be interpreted in a sense that is generally understood by those skilled in the art to which this embodiment belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology.

[0036] Furthermore, the terms used in this embodiment are for the purpose of describing the embodiment and are not intended to limit the invention.

[0037] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0038] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the present embodiment. These terms are used merely to distinguish the components from other components and are not intended to limit the essence, order, or sequence of the components.

[0039] And, where it is stated that a component is 'connected', 'combined', or 'connected' to another component, this may include not only cases where the component is directly 'connected', 'combined', or 'connected' to the other component, but also cases where it is 'connected', 'combined', or 'connected' due to another component located between the component and the other component.

[0040] Furthermore, when described as being formed or placed "above" or "below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above" or "below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0041] In the description of the invention, "object side" may refer to a surface of the lens facing the object side with respect to the optical axis (OA), and "sensor side" may refer to a surface of the lens facing the imaging surface (image sensor) with respect to the optical axis. "Object side" may be the "object side," and "sensor side" may be the "image side." One surface of the lens being convex may refer to a convex shape in the optical axis or paraxial region, and one surface of the lens being concave may refer to a concave shape in the optical axis or paraxial region. The radius of curvature, center thickness, and optical axis spacing between lenses listed in the lens data table may refer to values ​​(unit, mm) in the optical axis. The vertical direction may refer to a direction perpendicular to the optical axis, and the end of the lens or lens surface may refer to the end of the effective area of ​​the 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 paraxial region refers to a very narrow region near the optical axis, and is a region where the distance of light rays from the optical axis (OA) is almost zero. Hereinafter, the term optical axis may include the center of each lens or a very narrow region near the optical axis.

[0042]

[0043] As shown in FIGS. 1 and FIGS. 4, the optical system (1000, 1100) according to the first and second embodiments of the present invention may include six or more lenses. The lens portion may include first to seventh lenses (101-107, 201-207) aligned along the optical axis from the object side toward the sensor side. Each lens (101-107, 201-207) may have an object side and a sensor side. The optical system (1000, 1100) may include an aspherical lens to correct various aberrations.

[0044] Among the lenses of the optical system (1000, 1100), the maximum refractive index may be 1.6 or higher. The chromatic dispersion of incident light can be increased by the lens having the maximum refractive index, and the center thickness can be thinner than the edge thickness. In addition, since the lens having the maximum refractive index is placed on the object side, it is easy to change the radius of curvature of the second and subsequent lenses and increase the center thickness.

[0045]

[0046] The effective diameter may be the diameter of the effective area where effective light is incident from each lens. The effective diameter is the length in the direction (X,Y) perpendicular to the optical axis and is the average of the effective diameter of the object side and the effective diameter of the sensor side of each lens. "Diameter of the lens surface" may refer to the "effective diameter of the lens." "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 lens flange is not illustrated in FIGS. 1 and 4, the flange may be a portion formed to protrude perpendicular to the optical axis from the side of the lens so that the lens can be coupled to the barrel. Effective light may not be incident on the flange. A spacer may be additionally placed between the flanges of different lenses to allow the lenses to be coupled to the barrel.

[0047] Each of the lenses (101-107, 201-207) may include an effective region and an ineffective region. The effective region may be an area through which light incident on each of the lenses passes. That is, the effective region may be defined as an effective area or effective mirror where the incident light is refracted to realize optical properties. The ineffective region may be positioned around the periphery of the effective region. The ineffective region may be an area where effective light is not incident from the plurality of lenses. That is, the ineffective region may be an area unrelated to optical properties. Additionally, the end of the ineffective region may be an area fixed to a lens barrel or the like that accommodates the lens.

[0048]

[0049] Within the optical system (1000, 1100), the Total Top Length (TTL) may be greater than 1.2 times Imgh, for example, greater than 1.2 times and less than or equal to 1.5 times. The Total Track Length (TTL) is the distance along the optical axis (OA) from the center of the object side of the first lens to the top plane of the image sensor (300). Imgh is twice 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 Focus Length (EFL) may be 8 mm or more and the Field of View (FOV) may be less than 240 degrees.

[0050] The optical system (1000, 1100) may have a TTL / Imgh condition of 1 or more and 1.2 or more, for example, 1.2 or more and 1.5 or less. By setting the TTL / Imgh value of the optical system (1000, 1100) to 1.2 or more and 1.5 or less, a mobile lens optical system can be provided. Accordingly, the optical system (1000, 1100) can provide an image without exaggeration or distortion regarding the formed image.

[0051]

[0052] The effective diameter of at least one plastic lens within the optical system (1000, 1100) may be smaller than the length of the image sensor (300). The effective diameter is the diameter or length of the effective area where light is incident. The length of the image sensor (300) is the maximum length of the diagonal in the direction orthogonal to the optical axis (OA). There may not be a number of lenses within the optical system (1000, 1100) having an effective diameter greater than the length of the image sensor (300).

[0053] The lens section can be composed of plastic lenses. Accordingly, if plastic lenses are placed within the camera module, the weight of the camera module can be reduced. Furthermore, the plastic material is easy to polish and process, resistant to external impact, highly cost-competitive, and easy to secure. Additionally, various aberrations can be corrected by the plastic lenses, thereby preventing degradation of optical performance.

[0054] An embodiment of the invention can reduce the weight of the camera module and provide a lower manufacturing cost by configuring the optical system (1000, 1100) with a plastic lens, and can suppress the degradation of optical properties due to temperature changes, and various types of plastic lenses can replace glass lenses, and it can be easy to polish and process lens surfaces such as aspherical or free-form surfaces.

[0055]

[0056] The effective diameter of the lens closest to the object side within the lens section may be the largest among the lenses included in the optical system. 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 diameters of each lens, the optical system (1000, 1100) can control the incident light to compensate for the degradation of optical characteristics due to resolution and temperature changes, improve chromatic aberration control characteristics, and improve the vignetting characteristics of the optical system (1000, 1100).

[0057] Within the lens unit, when the focal length is taken as an absolute value, the focal length of the lens closest to the object may be greater than the focal length of the lens closest to the image sensor.

[0058] In the lens portion, the minimum effective diameter may be in the range of 6 mm to 8 mm, and the maximum effective diameter may be in the range of 25 mm to 40 mm. Additionally, the optical system (1000, 1100) can improve resolution and chromatic aberration control characteristics by controlling incident light, and can improve the vignetting characteristics of the optical system (1000, 1100).

[0059]

[0060] An optical system (1000, 1100) or a camera module may include an image sensor (300). The image sensor (300) may detect light and convert it into an electrical signal. The image sensor (300) may detect light that has passed through a lens section sequentially. The image sensor (300) may include a device capable of detecting incident light, such as a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS).

[0061] Here, the number of lenses having an effective diameter larger than the length of the image sensor (300) is 0 to 2, and the number of lenses having an effective diameter smaller than the length of the image sensor (300) may be 6 to 7.

[0062]

[0063] The optical system (1000, 1100) or camera module may include a filter (400). The filter (400) may be placed between the last lens and the image sensor (300). The filter (400) may be placed between the lens closest to the sensor side among the lenses of the lens unit and the image sensor (300). For example, the filter (400) may be placed between the nth lens and the image sensor (300).

[0064] The cover glass is placed between the filter (400) and the image sensor (300), protects the top 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.

[0065] The filter (400) may include an infrared filter or an infrared cut-off filter (IR cut-off). The filter (400) may pass light of a set wavelength band and filter light of a different wavelength band. If the filter (400) includes an infrared filter, it may block radiant heat emitted from external light from being transmitted to the image sensor (300). Additionally, the filter (400) may transmit visible light and reflect infrared light. The optical system (1000, 1100) according to the embodiment may include an aperture (Stop). The aperture may control the amount of light incident on the optical system (1000, 1100).

[0066] In the optical system (1000, 1100) of the first and second embodiments, the sum of the refractive indices of the lenses in the lens section may be 10 or more, for example, in the range of 10 to 15, and the average refractive index may be in the range of 1.5 to 1.7. The sum of the Abbe numbers of each lens may be 200 or more, for example, in the range of 250 to 300, and the average Abbe number may be 50 or less, for example, in the range of 30 to 50. The sum of the center thicknesses of the entire lens may be 20 mm or more, for example, in the range of 20 mm to 25 mm, and the average of the center thicknesses may be in the range of 2 mm to 4 mm. The sum of the center spacings between the lenses on the optical axis (OA) may be 10 mm or more, for example, in the range of 10 mm to 20 mm, and may be smaller than the sum of the center thicknesses of the lenses. In addition, the average value of the effective diameter of each lens surface (S1-S14) of the lens section may be 10 mm or more, for example, in the range of 15 mm to 20 mm.

[0067] In the optical system according to the first and second embodiments of the invention, the angle of view (diagonal) may be 240 degrees or less, for example, in the range of 180 degrees to 240 degrees. The F number of the optical system or camera module may be 3.0 or less, for example, in the range of 2.0 to 3.0 or in the range of 2.0 to 2.5.

[0068]

[0069] An optical system according to the first embodiment of the invention will be described.

[0070] 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 the aspherical coefficients of aspherical lenses in the optical system of FIG. 1, 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, and FIG. 4 is a graph showing data on the aberration characteristics of the optical system of FIG. 1 at room temperature.

[0071] Referring to FIG. 1, the optical system (1000) includes a lens portion, and the lens portion may include a first lens (101) to a seventh lens (107). The first to seventh lenses (101 to 107) may be arranged sequentially 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 a filter (400) and be incident on an image sensor (300).

[0072] The first lens (101) may be positioned closest to the object side. The first lens (101) may be positioned furthest from the sensor side. The first lens (101) may have a negative (-) refractive power at 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.

[0073] With respect to the optical axis, the first surface (S1) on the object side of the first lens (101) may be convex, and the second surface (S2) on the sensor side may be concave. The first lens (101) may have a meniscus shape that is convex toward the object side. The first lens (101) may have a meniscus shape that is concave toward the sensor side. The first lens (101) may be made of plastic material and may have an aspherical surface.

[0074] The refractive index (n1) of the first lens (101) may satisfy the condition that n1 > 1.5 or n1 > 1.54. 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) may increase, and lens manufacturing may be easy. 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 to increase the refractive power of the first and second lenses (101, 102), and in this case, lens manufacturing is not easy, the lens defect rate increases, and it may cause a decrease in yield. At least one or both of the first surface (S1) and the second surface (S2) may be provided without a critical point from the optical axis (OA) to the end of the effective area.

[0075] An aperture (Stop) can be positioned around the perimeter of the sensor-side second surface (S2) of the first lens (101). An aperture (Stop) can be positioned around the perimeter of the object-side third surface (S3) of the second lens (102). An aperture (Stop) positioned between the first lens (101) and the second lens (102) may be a field stop. A field stop can improve image quality by limiting the field of view and minimize peripheral distortion or vignetting. The aperture can reduce TTL within the angle of view range and enable the miniaturization of the optical system. Accordingly, it is possible to prevent a decrease in the yield by weight of the optical system and promote improved production efficiency.

[0076]

[0077] The second lens (102) may be positioned second from the object side. The second lens (102) may be positioned sixth from the sensor side. The second lens (102) may be positioned between the first lens (101) and the third lens (103). The second lens (102) may have a negative (-) refractive power at the optical axis (OA). The second lens (102) may include plastic or glass material. For example, the second lens (102) may be provided with plastic material.

[0078] With respect to the optical axis (OA), the object-side third surface (S3) of the second lens (102) may be convex, and the sensor-side fourth surface (S4) may be concave. The second lens (102) may have a meniscus shape that is concave toward the sensor side. The second lens (102) may have a meniscus shape that is convex toward the object side. The second lens (102) is made of plastic material and may have an aspherical surface. At least one or both of the third surface (S3) and the fourth surface (S4) may be aspherical.

[0079] At least one or both of the third surface (S3) and the fourth surface (S4) may be provided without a threshold point from the optical axis (OA) to the end of the effective area.

[0080]

[0081] The third lens (103) may be positioned as the third lens from the object side. The third lens (103) may be positioned as the fifth lens from the sensor side. The third lens (103) may be positioned between the second lens (102) and the fourth lens (104). The third lens (103) may have a positive (+) refractive power at the optical axis (OA). The third lens (103) may include plastic or glass material. For example, the third lens (103) may be provided with plastic material.

[0082] With respect to the optical axis, the object-side fifth surface (S5) of the third lens (103) may be convex, and the sensor-side sixth surface (S6) may be convex. The third lens (103) may have a shape with both sides convex. The third lens (103) may be made of plastic material and may be aspherical. At least one or both of the fifth surface (S5) and the sixth surface (S6) may be aspherical. At least one or both of the fifth surface (S5) and the sixth surface (S6) may be provided without a critical point from the optical axis (OA) to the end of the effective area.

[0083] An aperture (Stop) can be positioned around the perimeter of the sensor-side sixth surface (S6) of the third lens (103). An aperture (Stop) can be positioned around the perimeter of the object-side seventh surface (S7) of the fourth lens (104). An aperture (Stop) positioned between the third lens (103) and the fourth lens (104) may be a field stop. A field stop can improve image quality by limiting the field of view and minimize peripheral distortion or vignetting. The aperture can reduce TTL within the angle of view range and enable the miniaturization of the optical system. Accordingly, it is possible to prevent a decrease in the yield by weight of the optical system and promote improved production efficiency.

[0084]

[0085] The fourth lens (104) may be positioned as the fourth lens from the object side. The fourth lens (104) may be positioned as the fourth lens from the sensor side. The fourth lens (104) may be positioned between the third lens (103) and the fifth lens (105). The fourth lens (104) may have a positive (+) refractive power at the optical axis (OA). The fourth lens (104) may include plastic or glass material. For example, the fourth lens (104) may be provided with plastic material.

[0086] With respect to the optical axis, the object-side seventh surface (S7) of the fourth lens (104) may be convex, and the sensor-side eighth surface (S8) may be convex. The fourth lens (104) may have a shape with both sides convex. The fourth lens (104) may be made of plastic material and may be aspherical. At least one or both of the seventh surface (S7) and the eighth surface (S8) may be aspherical. At least one or both of the seventh surface (S7) and the eighth surface (S8) may be provided without a threshold point from the optical axis (OA) to the end of the effective area.

[0087]

[0088] The fifth lens (105) may be positioned as the fifth lens from the object side. The fifth lens (105) may be positioned as the third lens from the sensor side. The fifth lens (105) may be positioned between the fourth lens (104) and the sixth lens (106). The fifth lens (105) may have a negative (-) refractive power at the optical axis (OA). The fifth lens (105) may include plastic or glass material. For example, the fifth lens (105) may be provided with plastic material.

[0089] With respect to the optical axis, the object-side ninth surface (S9) of the fifth lens (105) may be convex, and the sensor-side tenth surface (S10) may be concave. The fifth lens (105) may have a meniscus shape with the object side being convex. The fifth lens (105) may have a meniscus shape with the sensor side being concave. The fifth lens (105) may be made of plastic material and may be aspherical. At least one or both of the ninth surface (S9) and the tenth surface (S10) may be aspherical. The ninth surface (S9) of the fifth lens (105) may have a critical point from the optical axis to the end of the effective area. When the ninth surface (S9) has a critical point, it may be located within 30% to 45% of the effective radius from the optical axis, preferably within 35% to 40%. The critical point of the ninth surface (S9) may be located in the range of 1.0 mm to 2.5 mm from the optical axis, preferably in the range of 1.5 mm to 2.0 mm. The critical point of the ninth surface (S9) is a point where the sign of the slope 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 slope value is 0. Additionally, the critical point of the ninth surface (S9) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases. The tenth surface (S10) of the fifth lens (105) may be provided without a critical point from the optical axis to the end of the effective area.

[0090]

[0091] The sixth lens (106) may be positioned as the sixth lens from the object side. The sixth lens (106) may be positioned as the second lens from the sensor side. The sixth lens (106) may be positioned between the fifth lens (105) and the seventh lens (107). The sixth lens (106) may have a positive (+) refractive power at the optical axis (OA). The sixth lens (106) may include plastic or glass material. For example, the sixth lens (106) may be provided with plastic material.

[0092] With respect to the optical axis, the object-side 11th surface (S11) of the 6th lens (106) may be concave, and the sensor-side 12th surface (S12) may be convex. The 6th lens (106) may have a meniscus shape with the object side being concave. The 6th lens (106) may have a meniscus shape with the sensor side being convex. The 6th lens (106) may be made of plastic material and may be aspherical. At least one or both of the 11th surface (S11) and the 12th surface (S12) may be aspherical. At least one or both of the 11th surface (S11) and the 12th surface (S12) may be provided without a critical point from the optical axis (OA) to the end of the effective area.

[0093]

[0094] The seventh lens (107) may be positioned as the seventh lens from the object side. The seventh lens (107) may be positioned closest to the sensor side. The seventh lens (107) may have a negative (-) refractive power at the optical axis (OA). The seventh lens (107) may include plastic or glass material. For example, the seventh lens (107) may be provided with plastic material.

[0095] With respect to the optical axis, the object-side 13th surface (S13) of the 7th lens (107) may be convex, and the sensor-side 14th surface (S14) may be concave. With respect to the optical axis, the object-side 13th surface (S13) of the 7th lens (107) may be convex, and the sensor-side 14th surface (S14) may be concave. The 7th lens (107) may have a meniscus shape with the sensor side being concave. The 7th lens (107) may have a meniscus shape with the object side being convex. The 7th lens (107) may be made of plastic material and may be aspherical. At least one or both of the 13th surface (S13) and the 14th surface (S14) may be aspherical.

[0096] The 13th surface (S13) of the 7th lens (107) may have a critical point from the optical axis to the end of the effective area. When the 13th surface (S13) has a critical point, it may be located in the range of 40% to 60% of the effective radius from the optical axis, preferably in the range of 45% to 55%. The critical point of the 13th surface (S13) may be located in the range of 5.0 mm to 7.0 mm from the optical axis, preferably in the range of 5.5 mm to 6.0 mm. The critical point of the 13th surface (S13) is a point where the sign of the slope 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 slope value is 0. Additionally, the critical point of the 13th surface (S13) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases.

[0097] The 14th surface (S14) of the 7th lens (107) may have a critical point from the optical axis to the end of the effective area. When the 14th surface (S14) has a critical point, it may be located in the range of 65% to 80% of the effective radius from the optical axis, preferably in the range of 70% to 75%. The critical point of the 14th surface (S14) may be located in the range of 8 mm to 12 mm from the optical axis, preferably in the range of 9 mm to 11 mm. The critical point of the 14th surface (S14) is a point where the sign of the slope 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 slope value is 0. Additionally, the critical point of the 14th surface (S14) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases.

[0098]

[0099] LensSurfaceRadiusThicknessndvdSemiApertureFocal length1S143.8612.1601.54846.48417.963-35.953 S213.3976.217 10.798 2S123.3361.7391.53555.7107.746-16.627 S26.2903.617 5.222 3S117.4192.6141.58631.7004.24924.984 S2-90.5331.391 3.476 4S111.1694.0151.54548.0543.69612.769 S2-16.3281.151 4.500 5S140.7101.7391.65820.2764.748-28.555 S212.7411.599 6.247 6S1-28.3536.2751.54250.3477.25112.506 S2-5.9160.573 8.616 7S18.3822.2511.62623.58611.234-19.199 S24.4443.833 14.042 FilterS1Infinity2.174 15.706 S2Infinity2.357 16.347 ImageImageInfinity0.195 17.561

[0100]

[0101] Table 1 shows the surface number, radius of curvature, thickness of the center of each lens or distance between lens surfaces, index, nd, Abbe number (Abbe,vd), effective radius (Semi Aperture), and focal length of a lens according to the first embodiment of the present invention. At this time, the units of the radius of curvature and the thickness or distance may be mm.

[0102]

[0103] Item ValueItem ValueF10.000ET13.780ΣIndex11.039ET23.558ΣAbbe276.157ET32.089ΣCT20.794ET42.498ΣCG14.548ET53.381CA_max35.926ET61.823CA_min6.952ET 73.974CA_Aver15.684F-number2.400CT_max6.275FOV_D193.700CT_min1.739ImgH35.122CT_Aver2.971TD39.176EPD4.167TTL43.902BFL8.560F10.000

[0104] Table 2 is for items of the mathematical formulas described above in the optical system (1000) of the embodiment, and is for the TTL (Total track length) (mm), BFL (Back focal length), effective focal length (F) (mm), ImgH (mm), effective diameter (CA) (mm), thickness (mm), TTL (mm), TD (mm), which is the optical axis distance from the first plane (S1) to the 14th plane (S14), sum of refractive indices, sum of Abbe numbers, sum of thicknesses (mm), sum of spacing between adjacent lenses, effective diameter characteristics, diagonal angle of view (FOV_D) (Degree), edge thickness (ET), F number, etc. of the optical system (1000).

[0105] The center thickness of the first to seventh lenses (101 to 107) is denoted as CT1 to CT7, the edge thickness of the end of the effective area of ​​each lens is denoted as ET1 to ET7, the center gap between two adjacent lenses is denoted as CG1 to CG6, and the edge gap between the edges of each lens is denoted as 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 top surface of the image sensor (300).

[0106] As shown in FIG. 2, among the lenses of the lens portion of the first embodiment, the lens surfaces of the first to seventh lenses (101 to 107) may include an aspherical surface having a 30th-order aspherical coefficient. For example, the first to seventh lenses (101 to 107) may include a lens surface having a 30th-order aspherical coefficient. As described above, an aspherical surface having a 30th-order aspherical coefficient (a non-zero value) can significantly change the shape of the aspherical surface in the periphery, and thus can effectively correct the optical performance of the periphery of the field of view (FOV).

[0107] When compared by the absolute values ​​of the radius of curvature of each lens, the radius of curvature of the 6th surface (S6) of the 3rd lens (103) at the optical axis (OA) may be the maximum among the lenses, and the radius of curvature of the 14th surface (S14) of the 7th lens (107) may be the minimum among the lenses. The difference between the maximum radius of curvature and the minimum radius of curvature may be 15 times or more, for example, in the range of 20 to 25 times. The radius of curvature of the sensor side of the 7th lens (107) positioned on the sensor side of the 6th lens (106) may be the minimum among the lenses.

[0108] The shapes of the first to seventh lenses (101 to 107) having an aspherical shape can be designed to be smooth. If the aspherical surface is positioned at the very front of the optical system (1000), the performance of the lens is improved, but assembly may be reduced. To improve assembly, the shapes of the first to seventh lenses (101 to 107) must be designed to be smooth. When assembling the lenses into the barrel, they can be designed to have almost no curvature to minimize the impact on the lens positioned on the sensor side.

[0109] The absolute value of the radius of curvature of the first surface (S1) of the first lens (101) may be greater than the absolute value of the radius of curvature of the second surface (S2). The absolute value of the radius of curvature of the third surface (S3) of the second lens (102) may be greater than the absolute value of the radius of curvature of the fourth surface (S4). The absolute value of the radius of curvature of the fifth surface (S5) of the third lens (103) may be smaller than the absolute value of the radius of curvature of the sixth surface (S6). The absolute value of the radius of curvature of the seventh surface (S7) of the fourth lens (104) may be smaller than the absolute value of the radius of curvature of the eighth surface (S8). The absolute value of the radius of curvature of the ninth surface (S9) of the fifth lens (105) may be greater than the absolute value of the radius of curvature of the tenth surface (S10). The absolute value of the radius of curvature of the 11th surface (S11) of the 6th lens (106) may be greater than the absolute value of the radius of curvature of the 12th surface (S12). The absolute value of the radius of curvature of the 13th surface (S13) of the 7th lens (107) may be greater than the absolute value of the radius of curvature of the 14th surface (S14).

[0110] The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0111] Condition 1: 3 < |L1R1 / L1R2| < 3.5

[0112] Condition 2: 3.5 < |L2R1 / L2R2| < 4

[0113] Condition 3: 0.1 < |L3R1 / L3R2| < 0.5

[0114] Condition 4: 0.5 < |L4R1 / L4R2| < 1

[0115] Condition 5: 3 < |L5R1 / L5R2| < 3.5

[0116] Condition 6: 4.5 < |L6R1 / L6R2| < 5

[0117] Condition 7: 1.5 < |L7R1 / L7R2| < 2

[0118]

[0119] When describing the center thickness of the lenses based on the optical axis, the center thickness (CT6) of the 6th lens (106) is the largest among the lenses, and the center thickness (CT1) of the 1st lens (101) is the smallest among the lenses. The difference between the maximum center thickness and the minimum center thickness among the lenses may be in the range of 3 mm or more and 5 mm or less.

[0120] The center thickness of each lens can satisfy any one of the following conditions.

[0121] Condition 1: CT3, CT4, CT6, CT7 > CT1 > CT2, CT5

[0122] Condition 2: CT1, CT3, CT4, CT6, CT7 > CT2 > CT5

[0123] Condition 3: CT4, CT6 > CT3 > CT1, CT2, CT5, CT7

[0124] Condition 4: CT6 > CT4 > CT1, CT2, CT3, CT5, CT7

[0125] Condition 5: CT1, CT2, CT3, CT4, CT6, CT7 > CT5

[0126] Condition 6: CT6 > CT1, CT2, CT3, CT4, CT5, CT7

[0127] Condition 7: CT3, CT4, CT6 > CT7 > CT1, CT2, CT5

[0128]

[0129] To explain the center spacing (CG) between the lenses, the center spacing (CG1) between the first lens (101) and the second lens (102) may be maximum, and the center spacing (CG6) between the sixth and seventh lenses (106, 107) may be minimum. The difference between the maximum center spacing and the minimum center spacing among the spaced-out lens spacings may be 5 mm or more, for example, in the range of 5.5 mm to 6.0 mm.

[0130] The center spacing between each lens can satisfy the following conditions.

[0131] Condition 1: CG1 > CG2, CG3, CG4, CG5, CG6

[0132] Condition 2: CG1 > CG2 > CG3, CG4, CG5, CG6

[0133] Condition 3: CG1, CG2, CG5 > CG3 > CG4, CG6

[0134] Condition 4: CG1, CG2, CG3, CG5 > CG4 > CG6

[0135] Condition 5: CG1, CG2 > CG5 > CG3, CG4, CG6

[0136] Condition 6: CG1, CG2, CG3, CG4, CG5 > CG6

[0137]

[0138] Regarding the effective diameter, the effective diameter of the seventh lens (107) closest to the sensor side is maximum, and the lens having the maximum effective diameter may be a plastic lens. The lens having the maximum effective diameter may be the seventh lens (107). Here, the effective diameter is the average of the effective diameter of the object side of each lens and the effective diameter of the sensor side. The lens surface having the maximum effective diameter may be the 14th surface (S14) of the seventh lens (107). The effective diameter of the third lens (103) may be minimum within the lens section. The lens surface having the minimum effective diameter may be the 6th surface (S6) of the third lens (103).

[0139] The effective diameter of each lens can satisfy any one of the following conditions.

[0140] Condition 1: CA_L1 > CA_L2, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7

[0141] Condition 2: CA_L1, CA_L6, CA_L7 > CA_L2 > CA_L3, CA_L4, CA_L5

[0142] Condition 3: CA_L1, CA_L2, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L3

[0143] Condition 4: CA_L1, CA_L2, CA_L5, CA_L6, CA_L7 > CA_L4 > CA_L3

[0144] Condition 5: CA_L1, CA_L2, CA_L6, CA_L7 > CA_L5 > CA_L4, CA_L3

[0145] Condition 6: CA_L1, CA_L7 > CA_L6 > CA_L2, CA_L3, CA_L4, CA_L5

[0146] Condition 7: CA_L1 > CA_L7 > CA_L2, CA_L3, CA_L4, CA_L5, CA_L6

[0147]

[0148] Regarding the refractive index, the refractive index of the fifth lens (105) is the maximum among the lenses and may be greater than 1.5, for example, greater than 1.6. The second lens (102) may have the minimum refractive index among the lenses. For example, the refractive index of the second lens (102) may be the minimum among the lenses and may be less than 1.6, for example, less than 1.55. The difference between the maximum refractive index and the minimum refractive index may be 0.1 or greater.

[0149] The refractive index of each lens can satisfy any one of the following conditions.

[0150] Condition 1: n3, n5, n7 > n1 > n2, n4, n6

[0151] Condition 2: n1, n3, n4, n5, n6, n7 > n2

[0152] Condition 3: n5, n7 > n3 > n1, n2, n4, n6

[0153] Condition 4: n1, n3, n5, n7 > n4 > n2, n6

[0154] Condition 5: n5 > n1, n2, n3, n4, n6, n7

[0155] Condition 6: n1, n3, n4, n5, n7 > n6 > n2

[0156] Condition 7: n5 > n7 > n1, n2, n3, n4, n6

[0157]

[0158] When comparing the Abbe numbers, the Abbe number of the second lens (102) is the maximum among the lenses and may be 50 or more. The Abbe number of the fifth lens (105) is the minimum among the lenses and may be 25 or less. The difference between the maximum Abbe number and the minimum Abbe number may be 30 or more.

[0159] The Abbe number of each lens can satisfy any one of the following conditions.

[0160] Condition 1: v2, v4, v6 > v1 > v3, v5, v7

[0161] Condition 2: v2 > v1, v3, v4, v5, v6, v7

[0162] Condition 3: v1, v2, v4, v6 > v3 > v5, v7

[0163] Condition 4: v2, v6 > v4 > v1, v3, v5, v7

[0164] Condition 5: v1, v2, v3, v4, v6, v7 > v5

[0165] Condition 6: v2 > v6 > v1, v3, v4, v5, v7

[0166] Condition 7: v1, v2, v3, v4, v6 > v7 > v5

[0167]

[0168] The focal lengths (F3, F4, F6) of the 3rd, 4th, and 6th lenses (103, 104, 106) may have a positive (+) sign. The 3rd, 4th, and 6th lenses (103, 104, 106) may have a positive (+) refractive power. The focal lengths (F1, F2, F5, F7) of the 1st, 2nd, 5th, and 7th lenses (101, 102, 105, 107) may have a negative (-) sign. The 1st, 2nd, 5th, and 7th lenses (101, 102, 105, 107) may have a negative (-) refractive power.

[0169]

[0170] When comparing the absolute values ​​of the focal lengths, the focal length of the first lens (101) is the largest among the lenses and may be 30 or more and 40 or less. Among the lenses, the first lens (101), which is made of plastic, may have the largest focal length and the smallest refractive power. The focal length of the sixth lens (106) is the smallest among the lenses, and the absolute value of the focal length of the sixth lens (106) may be 10 or more and 15 or less. Among the lenses, the sixth lens (106), which is made of glass, may have the smallest focal length and the largest refractive power.

[0171] Among the lenses, the lens having the minimum focal length may be the sixth lens (106). The difference between the maximum focal length and the minimum focal length may be 15 or more, or 20 or more. Accordingly, the optical system may have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc., within the angle of view range set in the optical system, and may have good optical performance at the periphery of the angle of view.

[0172] The absolute value of the focal length of each lens can satisfy any one of the following conditions.

[0173] Condition 1: |f1| > |f2|, |f3|, |f4|, |f5|, |f6|, |f7|

[0174] Condition 2: |f1|, |f3|, |f5|, |f7| > |f2| > |f4|, |f6|

[0175] Condition 3: |f1|, |f5| > |f3| > |f2|, |f4|, |f6|, |f7|

[0176] Condition 4: |f1|, |f2|, |f3|, |f5|, |f7| > |f4| > |f6|

[0177] Condition 5: |f1| > |f5| > |f2|, |f3|, |f4|, |f6|, |f7|

[0178] Condition 6: |f1|, |f2|, |f3|, |f4|, |f5|, |f7| > |f6|

[0179] Condition 7: |f1|, |f3|, |f5| > |f7| > |f2|, |f4|, |f6|

[0180]

[0181] The thickness (T1) of the first lens (101) may be maximum at the edge and minimum at the center, and the maximum thickness is in the range of 1.5 to 2 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 2 to 2.5 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 1.5 to 2 times the minimum thickness. The thickness (T5) of the fifth lens (105) 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. 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 3 to 3.5 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 1.5 to 2 times the minimum thickness.

[0182] The thickness of each lens can satisfy any one of the following conditions.

[0183] Condition 1: 0.5 < CT1 / ET1 < 1, 1.5 < ET1 / CT1 < 2

[0184] Condition 2: 0.1 < CT2 / ET2 < 0.5, 2 < ET2 / CT2 < 2.5

[0185] Condition 3: 1 < CT3 / ET3 < 1.5, 0.5 < ET3 / CT3 < 1

[0186] Condition 4: 1.5 < CT4 / ET4 < 2, 0.5 < ET4 / CT4 < 1

[0187] Condition 5: 0.5 < CT5 / ET5 < 1, 1.5 < ET5 / CT5 < 2

[0188] Condition 6: 3 < CT6 / ET6 < 3.5, 0.1 < ET6 / CT6 < 0.5

[0189] Condition 7: 0.5 < CT7 / ET7 < 1, 1.5 < ET7 / CT7 < 2

[0190] Condition 8: 0.5 < ΣCT / ΣET < 1, 1 < ΣET / ΣCT < 1.5

[0191]

[0192] Among the gaps (G1-G6) between the lenses, the first gap (G1) between the first and second lenses (101, 102) may have a maximum center and a minimum edge. The second gap (G2) between the second and third lenses (102, 103) may have a maximum center and a minimum edge. The third gap (G3) between the third and fourth lenses (103, 104) may have a maximum edge and a minimum center. The fourth gap (G4) between the fourth and fifth lenses (104, 105) may have a maximum edge and a minimum center. The fifth gap (G5) between the fifth and sixth lenses (105, 106) may have a minimum edge and a maximum center. The sixth gap (G6) between the sixth and seventh lenses (106, 107) may have a maximum edge and a minimum center.

[0193] Figure 4 is a graph showing the aberration characteristics of the optical system of Figure 1 at room temperature, low temperature, and high temperature. The aberration graph in Figure 4 shows the longitudinal spherical aberration, astigmatic field curves, and distortion measured from left to right. In Figure 4, the X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. Additionally, the graph for longitudinal spherical aberration is for light in the wavelength bands of approximately 435 nm, approximately 486 nm, approximately 546 nm, approximately 587 nm, and approximately 656 nm, while the graphs for astigmatic field curves and distortion are for light in the wavelength band of approximately 546 nm. In the aberration diagram of FIG. 4, it can be interpreted that the closer each curve at room temperature is to the Y-axis, the better the aberration correction function is. It can be seen that the optical system (1000) according to the first embodiment has measurement values ​​adjacent to the Y-axis in almost most areas. That is, the optical system (1000) according to the first embodiment has improved resolution and can have good optical performance not only at the center of the field of view (FOV) but also at the periphery. Here, room temperature may be in the range of 22°±5° or 18° to 27°.

[0194] The optical system of the first embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only at the center of the field of view (FOV) but also at the periphery.

[0195]

[0196] We will now describe an optical system according to the second embodiment of the invention.

[0197] FIG. 5 is a side cross-sectional view of an optical system according to a second embodiment and a camera module having the same, FIG. 6 is a table showing the aspherical coefficients of aspherical lenses in the optical system of FIG. 5, FIG. 7 is a table showing the Sag values ​​of the lens surfaces of the first to seventh lenses in the optical system of FIG. 5, and FIG. 8 is a graph showing data on the aberration characteristics of the optical system of FIG. 5 at room temperature.

[0198] Referring to FIG. 5, the optical system (1100) includes a lens portion, and the lens portion may include a first lens (201) to a seventh lens (207). The first to seventh lenses (201 to 207) may be arranged sequentially 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 a filter (400) and be incident on an image sensor (300).

[0199] The first lens (201) may be positioned closest to the object side. The first lens (201) may be positioned furthest from the sensor side. The first lens (201) may have a negative (-) refractive power at 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.

[0200] With respect to the optical axis, the first surface (S1) on the object side of the first lens (201) may be convex, and the second surface (S2) on the sensor side may be concave. The first lens (201) may have a meniscus shape that is convex toward the object side. The first lens (201) may have a meniscus shape that is concave toward the sensor side. The first lens (201) is made of plastic material and may have an aspherical surface.

[0201] The refractive index (n1) of the first lens (201) may satisfy the condition that n1 > 1.5 or n1 > 1.53. 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) may increase, and lens manufacturing may be easy. 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 to increase the refractive power of the first and second lenses (201, 202), and in this case, lens manufacturing is not easy, the lens defect rate increases, and it may cause a decrease in yield. At least one or both of the first surface (S1) and the second surface (S2) may be provided without a critical point from the optical axis (OA) to the end of the effective area.

[0202] An aperture (Stop) can be positioned around the perimeter of the sensor-side second surface (S2) of the first lens (201). An aperture (Stop) can be positioned around the perimeter of the object-side third surface (S3) of the second lens (202). An aperture (Stop) positioned between the first lens (201) and the second lens (202) may be a field stop. A field stop can improve image quality by limiting the field of view and minimize peripheral distortion or vignetting. The aperture can reduce TTL within the angle of view range and enable the miniaturization of the optical system. Accordingly, it is possible to prevent a decrease in the yield by weight of the optical system and promote improved production efficiency.

[0203]

[0204] The second lens (202) may be positioned second from the object side. The second lens (202) may be positioned sixth from the sensor side. The second lens (202) may be positioned between the first lens (201) and the third lens (203). The second lens (202) may have a negative (-) refractive power at the optical axis (OA). The second lens (202) may include plastic or glass material. For example, the second lens (202) may be provided with plastic material.

[0205] With respect to the optical axis (OA), the object-side third surface (S3) of the second lens (202) may be convex, and the sensor-side fourth surface (S4) may be concave. The second lens (202) may have a meniscus shape that is concave toward the sensor side. The second lens (202) may have a meniscus shape that is convex toward the object side. The second lens (202) is made of plastic material and may have an aspherical surface. At least one or both of the third surface (S3) and the fourth surface (S4) may be aspherical.

[0206] At least one or both of the third surface (S3) and the fourth surface (S4) may be provided without a threshold point from the optical axis (OA) to the end of the effective area.

[0207]

[0208] The third lens (203) may be positioned as the third lens from the object side. The third lens (203) may be positioned as the fifth lens from the sensor side. The third lens (203) may be positioned between the second lens (202) and the fourth lens (204). The third lens (203) may have a positive (+) refractive power at the optical axis (OA). The third lens (203) may include plastic or glass material. For example, the third lens (203) may be provided with plastic material.

[0209] With respect to the optical axis, the object-side fifth surface (S5) of the third lens (203) may be convex, and the sensor-side sixth surface (S6) may be convex. The third lens (203) may have a shape with both sides convex. The third lens (203) may be made of plastic material and may be aspherical. At least one or both of the fifth surface (S5) and the sixth surface (S6) may be aspherical. At least one or both of the fifth surface (S5) and the sixth surface (S6) may be provided without a threshold point from the optical axis (OA) to the end of the effective area.

[0210] An aperture (Stop) can be positioned around the perimeter of the sensor-side sixth surface (S6) of the third lens (203). An aperture (Stop) can be positioned around the perimeter of the object-side seventh surface (S7) of the fourth lens (204). An aperture (Stop) positioned between the third lens (203) and the fourth lens (204) may be a field stop. A field stop can improve image quality by limiting the field of view and minimize peripheral distortion or vignetting. The aperture can reduce TTL within the angle of view range and enable the miniaturization of the optical system. Accordingly, it is possible to prevent a decrease in the yield by weight of the optical system and promote improved production efficiency.

[0211]

[0212] The fourth lens (204) may be positioned as the fourth lens from the object side. The fourth lens (204) may be positioned as the fourth lens from the sensor side. The fourth lens (204) may be positioned between the third lens (203) and the fifth lens (205). The fourth lens (204) may have a positive (+) refractive power at the optical axis (OA). The fourth lens (204) may include plastic or glass material. For example, the fourth lens (204) may be provided with plastic material.

[0213] With respect to the optical axis, the object-side seventh surface (S7) of the fourth lens (204) may be convex, and the sensor-side eighth surface (S8) may be convex. The fourth lens (204) may have a shape with both sides convex. The fourth lens (204) may be made of plastic material and may be aspherical. At least one or both of the seventh surface (S7) and the eighth surface (S8) may be aspherical. At least one or both of the seventh surface (S7) and the eighth surface (S8) may be provided without a threshold point from the optical axis (OA) to the end of the effective area.

[0214]

[0215] The fifth lens (205) may be positioned as the fifth lens from the object side. The fifth lens (205) may be positioned as the third lens from the sensor side. The fifth lens (205) may be positioned between the fourth lens (204) and the sixth lens (206). The fifth lens (205) may have a negative (-) refractive power at the optical axis (OA). The fifth lens (205) may include plastic or glass material. For example, the fifth lens (205) may be provided with plastic material.

[0216] With respect to the optical axis, the object-side ninth surface (S9) of the fifth lens (205) may be convex, and the sensor-side tenth surface (S10) may be concave. The fifth lens (205) may have a meniscus shape with the object side being convex. The fifth lens (205) may have a meniscus shape with the sensor side being concave. The fifth lens (205) may be made of plastic material and may be aspherical. At least one or both of the ninth surface (S9) and the tenth surface (S10) may be aspherical. The ninth surface (S9) of the fifth lens (205) may have a critical point from the optical axis to the end of the effective area. When the ninth surface (S9) has a critical point, it may be located within 30% to 50% of the effective radius from the optical axis, preferably within 35% to 45%. The critical point of the ninth surface (S9) may be located in the range of 1.0 mm to 2.5 mm from the optical axis, preferably in the range of 1.5 mm to 2.0 mm. The critical point of the ninth surface (S9) is a point where the sign of the slope 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 slope value is 0. Additionally, the critical point of the ninth surface (S9) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases. The tenth surface (S10) of the fifth lens (205) may be provided without a critical point from the optical axis to the end of the effective area.

[0217]

[0218] The sixth lens (206) may be positioned as the sixth lens from the object side. The sixth lens (206) may be positioned as the second lens from the sensor side. The sixth lens (206) may be positioned between the fifth lens (205) and the seventh lens (207). The sixth lens (206) may have a positive (+) refractive power at the optical axis (OA). The sixth lens (206) may include plastic or glass material. For example, the sixth lens (206) may be provided with plastic material.

[0219] With respect to the optical axis, the object-side 11th surface (S11) of the 6th lens (206) may be convex, and the sensor-side 12th surface (S12) may be convex. The 6th lens (206) may have a shape with both sides convex. The 6th lens (206) may be made of plastic material and may be aspherical. At least one or both of the 11th surface (S11) and the 12th surface (S12) may be aspherical. At least one or both of the 11th surface (S11) and the 12th surface (S12) may be provided without a threshold point from the optical axis (OA) to the end of the effective area.

[0220]

[0221] The seventh lens (207) may be positioned as the seventh lens from the object side. The seventh lens (207) may be positioned closest to the sensor side. The seventh lens (207) may have a negative (-) refractive power at the optical axis (OA). The seventh lens (207) may include plastic or glass material. For example, the seventh lens (207) may be provided with plastic material.

[0222] With respect to the optical axis, the object-side 13th surface (S13) of the 7th lens (207) may be convex, and the sensor-side 14th surface (S14) may be concave. With respect to the optical axis, the object-side 13th surface (S13) of the 7th lens (207) may be convex, and the sensor-side 14th surface (S14) may be concave. The 7th lens (207) may have a meniscus shape with the sensor side being concave. The 7th lens (207) may have a meniscus shape with the object side being convex. The 7th lens (207) may be made of plastic material and may be aspherical. At least one or both of the 13th surface (S13) and the 14th surface (S14) may be aspherical.

[0223] The 13th surface (S13) of the 7th lens (207) may have a critical point from the optical axis to the end of the effective area. When the 13th surface (S13) has a critical point, it may be located in the range of 40% to 60% of the effective radius from the optical axis, preferably in the range of 45% to 55%. The critical point of the 13th surface (S13) may be located in the range of 5.0 mm to 7.0 mm from the optical axis, preferably in the range of 5.5 mm to 6.0 mm. The critical point of the 13th surface (S13) is a point where the sign of the slope 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 slope value is 0. Additionally, the critical point of the 13th surface (S13) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases.

[0224] The 14th surface (S14) of the 7th lens (207) may have a critical point from the optical axis to the end of the effective area. When the 14th surface (S14) has a critical point, it may be located in the range of 65% to 80% of the effective radius from the optical axis, preferably in the range of 70% to 75%. The critical point of the 14th surface (S14) may be located in the range of 8 mm to 12 mm from the optical axis, preferably in the range of 9 mm to 11 mm. The critical point of the 14th surface (S14) is a point where the sign of the slope 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 slope value is 0. Additionally, the critical point of the 14th surface (S14) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases.

[0225]

[0226] LensSurfaceRadiusThicknessndvdSemiApertureFocal length1S149.1393.8101.53555.71023.229-34.602 S213.1195.686 11.427 2S116.7701.8071.53753.99010.062-19.034 S26.1264.775 6.414 3S120.9823.2691.57035.4865.59829.873 S2-88.0180.819 4.601 Stopdummy-0.519 3.707 4S112.8363.4371.53555.7103.92714.008 S2-16.4770.947 4.049 5S141.7611.7871.66219.9534.505-32.473 S214.0581.902 5.795 6S1222.6126.7731.53654.6548.35412.228 S2-6.7110.416 9.324 7S117.8472.8631.65320.71010.448-17.106 S26.4783.610 14.515 FilterS1Infinity2.249 16.740Infinity S2Infinity2.714 17.462 ImageImageInfinity0.057 19.142

[0227] Table 3 shows the surface number, radius of curvature, thickness of the center of each lens or distance between lens surfaces, index, nd, Abbe number (Abbe,vd), effective radius (Semi Aperture), and focal length of the lens according to the second embodiment of the present invention. At this time, the units of the radius of curvature and the thickness or distance may be mm.

[0228]

[0229] Item ValueItem ValueF10.000ET14.577ΣIndex11.028ET24.353ΣAbbe296.212ET32.553ΣCT23.747ET42.136ΣCG14.544ET52.910CA_max46.458ET61.666CA_min7.413ET 75.145CA_Aver16.794F-number2.400CT_max6.773FOV_D220.000CT_min1.787ImgH38.284CT_Aver3.392TD42.420EPD4.167TTL47.440BFL8.630F10.000

[0230] Table 4 is for the items of the mathematical formulas described above in the optical system (1100) of the embodiment, and is for the TTL (Total track length) (mm), BFL (Back focal length), effective focal length (F) (mm), ImgH (mm), effective diameter (CA) (mm), thickness (mm), TTL (mm), optical axis distance from the first plane (S1) to the eighth plane (S8) TD (mm), optical axis distance from the aperture (Stop) to the eighth plane (S8) SD (mm), sum of refractive indices, sum of Abbe numbers, sum of thicknesses (mm), sum of spacing between adjacent lenses, effective diameter characteristics, diagonal angle of view (FOV_D) (Degree), vertical angle of view (FOV_V) (Degree), horizontal angle of view (FOV_H) (Degree), edge thickness (ET), F number, etc.

[0231] The center thickness of the first to seventh lenses (201 to 207) is denoted as CT1 to CT7, the edge thickness of the end of the effective area of ​​each lens is denoted as ET1 to ET7, the center gap between two adjacent lenses is denoted as CG1 to CG6, and the edge gap between the edges of each lens is denoted as 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 (201) to the top surface of the image sensor (300).

[0232] As shown in FIG. 6, among the lenses of the lens portion of the second embodiment, the lens surfaces of the first to seventh lenses (201 to 207) may include an aspherical surface having a 30th-order aspherical coefficient. For example, the first to seventh lenses (201 to 207) may include a lens surface having a 30th-order aspherical coefficient. As described above, an aspherical surface having a 30th-order aspherical coefficient (a non-zero value) can significantly change the shape of the aspherical surface in the periphery, and thus can effectively correct the optical performance of the periphery of the field of view (FOV).

[0233] When compared by the absolute values ​​of the radius of curvature of each lens, the radius of curvature of the 11th surface (S11) of the 6th lens (206) at the optical axis (OA) may be the maximum among the lenses, and the radius of curvature of the 4th surface (S4) of the 2nd lens (202) may be the minimum among the lenses. The difference between the maximum radius of curvature and the minimum radius of curvature may be 30 times or more, for example, in the range of 30 to 40 times. The radius of curvature of the sensor side of the 2nd lens (202) positioned on the object side of the 3rd lens (203) may be the minimum among the lenses.

[0234] In temperature-compensated designs that must maintain resolution despite temperature variations ranging from -40 to 100 degrees, a larger radius of curvature can be advantageous. Aluminum barrels may be used for lens barrels in temperature-compensated designs. However, due to the large manufacturing tolerances of aluminum barrels, the optical axes between lenses become significantly misaligned when assembled. Therefore, designing a large radius of curvature can reduce sensitivity to manufacturing tolerances.

[0235] The shapes of the first to seventh lenses (201 to 207) having an aspherical shape can be designed to be smooth. If the aspherical surface is positioned at the very front of the optical system (1100), the performance of the lens is improved, but assembly may be reduced. To improve assembly, the shapes of the first to seventh lenses (201 to 207) must be designed to be smooth. When assembling the lenses into the barrel, they can be designed to have almost no curvature to minimize the impact on the lens positioned on the sensor side.

[0236] The absolute value of the radius of curvature of the first surface (S1) of the first lens (201) may be greater than the absolute value of the radius of curvature of the second surface (S2). The absolute value of the radius of curvature of the third surface (S3) of the second lens (202) may be greater than the absolute value of the radius of curvature of the fourth surface (S4). The absolute value of the radius of curvature of the fifth surface (S5) of the third lens (203) may be smaller than the absolute value of the radius of curvature of the sixth surface (S6). The absolute value of the radius of curvature of the seventh surface (S7) of the fourth lens (204) may be smaller than the absolute value of the radius of curvature of the eighth surface (S8). The absolute value of the radius of curvature of the ninth surface (S9) of the fifth lens (205) may be greater than the absolute value of the radius of curvature of the tenth surface (S10). The absolute value of the radius of curvature of the 11th surface (S11) of the 6th lens (206) may be greater than the absolute value of the radius of curvature of the 12th surface (S12). The absolute value of the radius of curvature of the 13th surface (S13) of the 7th lens (207) may be greater than the absolute value of the radius of curvature of the 14th surface (S14).

[0237] The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0238] Condition 1: 3.5 < |L1R1 / L1R2| < 4

[0239] Condition 2: 2.5 < |L2R1 / L2R2| < 3

[0240] Condition 3: 0.1 < |L3R1 / L3R2| < 0.5

[0241] Condition 4: 0.5 < |L4R1 / L4R2| < 1

[0242] Condition 5: 2.5 < |L5R1 / L5R2| < 3

[0243] Condition 6: 30 < |L6R1 / L6R2| < 35

[0244] Condition 7: 2.5 < |L7R1 / L7R2| < 3

[0245]

[0246] When describing the center thickness of the lenses based on the optical axis, the center thickness (CT6) of the 6th lens (206) is the largest among the lenses, and the center thickness (CT5) of the 5th lens (205) is the smallest among the lenses. The difference between the maximum center thickness and the minimum center thickness among the lenses may be in the range of 5 mm or more and 8 mm or less.

[0247] The center thickness of each lens can satisfy any one of the following conditions.

[0248] Condition 1: CT6 > CT1 > CT2, CT3, CT4, CT5, CT7

[0249] Condition 2: CT1, CT4, CT3, CT6, CT7 > CT2 > CT5

[0250] Condition 3: CT1, CT4, CT6 > CT3 > CT2, CT5, CT7

[0251] Condition 4: CT1, CT6 > CT4 > CT2, CT3, CT5, CT7

[0252] Condition 5: CT1, CT2, CT3, CT4, CT6, CT7 > CT5

[0253] Condition 6: CT6 > CT1, CT2, CT3, CT4, CT5, CT7

[0254] Condition 7: CT1, CT3, CT4, CT6 > CT7 > CT2, CT5

[0255]

[0256] To explain the center spacing (CG) between the lenses, the center spacing (CG1) between the first lens (201) and the second lens (202) may be maximum, and the center spacing (CG6) between the sixth and seventh lenses (206, 207) may be minimum. The difference between the maximum center spacing and the minimum center spacing among the spaced-out lens spacings may be 5 mm or more, for example, in the range of 5 mm to 5.5 mm.

[0257] The center spacing between each lens can satisfy the following conditions.

[0258] Condition 1: CG1 > CG2, CG3, CG4, CG5, CG6

[0259] Condition 2: CG1 > CG2 > CG3, CG4, CG5, CG6

[0260] Condition 3: CG1, CG2, CG4, CG5 > CG3 > CG6

[0261] Condition 4: CG1, CG2, CG5 > CG4 > CG3, CG6

[0262] Condition 5: CG1, CG2 > CG5 > CG3, CG4, CG6

[0263] Condition 6: CG1, CG2, CG3, CG4, CG5 > CG6

[0264]

[0265] Regarding the effective aperture, the effective aperture of the first lens (201) closest to the object side is maximum, and the lens having the maximum effective aperture may be a lens made of plastic material. The lens having the maximum effective aperture may be the first lens (201). Here, the effective aperture is the average of the effective aperture of the object side and the effective aperture of the sensor side of each lens. The lens surface having the maximum effective aperture may be the first surface (S1) of the first lens (201). The effective aperture of the fourth lens (204) may be minimum within the lens section. The lens surface having the minimum effective aperture may be the seventh surface (S7) of the fourth lens (204).

[0266] The effective diameter of each lens can satisfy any one of the following conditions.

[0267] Condition 1: CA_L1 > CA_L2, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7

[0268] Condition 2: CA_L1, CA_L6, CA_L7 > CA_L2 > CA_L3, CA_L4, CA_L5

[0269] Condition 3: CA_L1, CA_L2, CA_L5, CA_L6, CA_L7 > CA_L3 > CA_L4

[0270] Condition 4: CA_L1, CA_L2, CA_L3, CA_L5, CA_L6, CA_L7 > CA_L4

[0271] Condition 5: CA_L1, CA_L2, CA_L6, CA_L7 > CA_L5 > CA_L4, CA_L3

[0272] Condition 6: CA_L1, CA_L7 > CA_L6 > CA_L2, CA_L3, CA_L4, CA_L5

[0273] Condition 7: CA_L1 > CA_L7 > CA_L2, CA_L3, CA_L4, CA_L5, CA_L6

[0274]

[0275] Regarding the refractive index, the refractive index of the fifth lens (205) is the maximum among the lenses and may be greater than 1.5, for example, greater than 1.6. The first lens (201) and the fourth lens (204) may have the minimum refractive index among the lenses. For example, the refractive index of the first lens (201) and the fourth lens (204) may be the minimum among the lenses and may be less than 1.6, for example, less than 1.55. The difference between the maximum refractive index and the minimum refractive index may be 0.1 or greater.

[0276] The refractive index of each lens can satisfy any one of the following conditions.

[0277] Condition 1: n2, n3, n5, n6, n7 > n1 = n4

[0278] Condition 2: n3, n5, n7 > n2 > n1, n4, n6

[0279] Condition 3: n5, n7 > n3 > n1, n2, n4, n6

[0280] Condition 4: n5 > n1, n2, n3, n4, n6, n7

[0281] Condition 5: n2, n3, n5, n7 > n6 > n1, n4

[0282] Condition 6: n5 > n7 > n1, n2, n3, n4, n6

[0283]

[0284] When comparing the Abbe numbers, the Abbe numbers of the first lens (201) and the fourth lens (204) are the maximum among the lenses and may be 50 or more. The Abbe number of the fifth lens (205) is the minimum among the lenses and may be 20 or less. The difference between the maximum Abbe number and the minimum Abbe number may be 30 or more.

[0285] The Abbe number of each lens can satisfy any one of the following conditions.

[0286] Condition 1: v1 = v4 > v2, v3, v5, v6, v7

[0287] Condition 2: v1, v4, v6 > v2 > v3, v5, v7

[0288] Condition 3: v1, v2, v4, v6 > v3 > v5, v7

[0289] Condition 4: v1, v2, v3, v4, v6, v7 > v5

[0290] Condition 5: v1, v4 > v6 > v2, v3, v5, v7

[0291] Condition 6: v1, v2, v3, v4, v6 > v7 > v5

[0292]

[0293] The focal lengths (F3, F4, F6) of the 3rd, 4th, and 6th lenses (203, 204, 206) may have a positive (+) sign. The 3rd, 4th, and 6th lenses (203, 204, 206) may have a positive (+) refractive power. The focal lengths (F1, F2, F5, F7) of the 1st, 2nd, 5th, and 7th lenses (201, 202, 205, 207) may have a negative (-) sign. The 1st, 2nd, 5th, and 7th lenses (201, 202, 205, 207) may have a negative (-) refractive power.

[0294]

[0295] When comparing the absolute values ​​of the focal lengths, the focal length of the first lens (201) is the largest among the lenses and may be 30 or more and 40 or less. Among the lenses, the first lens (201), which is made of plastic, may have the largest focal length and the smallest refractive power. The focal length of the sixth lens (206) is the smallest among the lenses, and the absolute value of the focal length of the sixth lens (206) may be 10 or more and 15 or less. Among the lenses, the sixth lens (206), which is made of glass, may have the smallest focal length and the largest refractive power.

[0296] Among the lenses, the lens having the minimum focal length may be the sixth lens (206). The difference between the maximum focal length and the minimum focal length may be 15 or more or 20 or more. Accordingly, the optical system may have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within the angle of view range set in the optical system, and may have good optical performance at the periphery of the angle of view.

[0297] The absolute value of the focal length of each lens can satisfy any one of the following conditions.

[0298] Condition 1: |f1| > |f2|, |f3|, |f4|, |f5|, |f6|, |f7|

[0299] Condition 2: |f1|, |f3|, |f5 > |f2| > |f4|, |f6||, |f7|

[0300] Condition 3: |f1|, |f5| > |f3| > |f2|, |f4|, |f6|, |f7|

[0301] Condition 4: |f1|, |f2|, |f3|, |f5|, |f7| > |f4| > |f6|

[0302] Condition 5: |f1| > |f5| > |f2|, |f3|, |f4|, |f6|, |f7|

[0303] Condition 6: |f1|, |f2|, |f3|, |f5|, |f7| > |f4|, |f6|

[0304] Condition 7: |f1|, |f2|, |f3|, |f5| > |f7| > |f4|, |f6|

[0305]

[0306] The thickness (T1) of the first lens (201) 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 (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 2 to 2.5 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 1.5 to 2 times the minimum thickness. The thickness (T5) of the fifth lens (205) 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. 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 4 to 4.5 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.

[0307] The thickness of each lens can satisfy any one of the following conditions.

[0308] Condition 1: 0.5 < CT1 / ET1 < 1, 1 < ET1 / CT1 < 1.5

[0309] Condition 2: 0.1 < CT2 / ET2 < 0.5, 2 < ET2 / CT2 < 2.5

[0310] Condition 3: 1 < CT3 / ET3 < 1.5, 0.5 < ET3 / CT3 < 1

[0311] Condition 4: 1.5 < CT4 / ET4 < 2, 0.5 < ET4 / CT4 < 1

[0312] Condition 5: 0.5 < CT5 / ET5 < 1, 1.5 < ET5 / CT5 < 2

[0313] Condition 6: 4 < CT6 / ET6 < 4.5, 0.1 < ET6 / CT6 < 0.5

[0314] Condition 7: 0.5 < CT7 / ET7 < 1, 1.5 < ET7 / CT7 < 2

[0315] Condition 8: 1 < ΣCT / ΣET < 1.5, 0.5 < ΣET / ΣCT < 1

[0316]

[0317] Among the gaps (G1-G6) between the lenses, the first gap (G1) between the first and second lenses (201, 202) may have a maximum center and a minimum edge. The second gap (G2) between the second and third lenses (202, 203) may have a maximum center and a minimum edge. The third gap (G3) between the third and fourth lenses (203, 204) may have a maximum edge and a minimum center. The fourth gap (G4) between the fourth and fifth lenses (204, 205) may have a maximum edge and a minimum center. The fifth gap (G5) between the fifth and sixth lenses (205, 206) may have a minimum edge and a maximum center. The sixth gap (G6) between the sixth and seventh lenses (206, 207) may have a maximum edge and a minimum center.

[0318]

[0319] Figure 8 is a graph showing the aberration characteristics at room temperature of the optical system of Figure 5. The aberration graph in Figure 8 shows the longitudinal spherical aberration, astigmatic field curves, and distortion measured from left to right. In Figure 8, the X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. Additionally, the graph for longitudinal spherical aberration is for light in the wavelength bands of approximately 435 nm, approximately 486 nm, approximately 546 nm, approximately 587 nm, and approximately 656 nm, while the graphs for astigmatic field curves and distortion are for light in the wavelength band of approximately 546 nm. In the aberration diagram of FIG. 8, it can be interpreted that the closer each curve at room temperature is to the Y-axis, the better the aberration correction function is. It can be seen that the optical system (1100) according to the second embodiment has measurement values ​​adjacent to the Y-axis in almost all areas. That is, the optical system (1100) according to the second embodiment has improved resolution and can have good optical performance not only at the center of the field of view (FOV) but also at the periphery. Here, room temperature may be in the range of 22°±5° or 18° to 27°.

[0320]

[0321] The optical system (1100) of the second embodiment may have a 0 Field MTF Peak shift of 5 µm or less at a low temperature (approx. -40°C) compared to room temperature (approx. 25°C). The optical system (1100) may have a 0 Field MTF Peak shift of 5 µm or less at a high temperature (approx. 95°C) compared to room temperature (approx. 25°C). The optical system and camera module according to the second embodiment may have good optical performance in a low to high temperature range (-40°C to 105°C). In addition, changes in optical performance can be minimized through AF correction when optical characteristics change due to temperature changes.

[0322] The optical system (1100) according to the second embodiment can maintain optical performance in NIR (Near Infrared) wavelengths in addition to visible light. When using wavelengths between 850 nm and 940 nm among NIR wavelengths, it is used in night surveillance and security systems and can detect objects even in dark environments. Changes in optical performance can be minimized through AF correction when optical characteristics change due to changes in the wavelength band used.

[0323] The optical system of the second embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only at the center of the field of view (FOV) but also at the periphery.

[0324]

[0325] The optical system (1000, 1100) according to the first and second embodiments disclosed above may satisfy at least one or two of the mathematical formulas described below. Accordingly, the optical system (1000, 1100) according to the first and second embodiments may have improved optical characteristics. For example, if the optical system (1000, 1100) satisfies at least one mathematical formula, the optical system (1000, 1100) can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and may have good optical performance not only at the center of the field of view (FOV) but also at the periphery. In addition, the optical system (1000, 1100) may have improved resolution. Furthermore, regarding the meaning of the thickness of the lens at the optical axis (OA) and the spacing of adjacent lenses at the optical axis (OA) described in the mathematical formulas, one may refer to the first and second embodiments disclosed above.

[0326]

[0327] The optical system (1000, 1100) according to the first and second embodiments disclosed above may satisfy at least one or two of the mathematical formulas described below. Accordingly, the optical system (1000, 1100) according to the first and second embodiments may have improved optical characteristics. For example, if the optical system (1000, 1100) satisfies at least one mathematical formula, the optical system (1000, 1100) can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and may have good optical performance not only at the center of the field of view (FOV) but also at the periphery. In addition, the optical system (1000, 1100) may have improved resolution. Furthermore, regarding the meaning of the thickness of the lens at the optical axis (OA) and the spacing of adjacent lenses at the optical axis (OA) described in the mathematical formulas, one may refer to the first and second embodiments disclosed above.

[0328]

[0329] [Mathematical Formula 1]

[0330] 0.1 < F / TTL < 0.5

[0331] In Equation 1, F is the effective focal length of the optical system, and TTL (Total track length) refers to the distance (mm) along the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101, 201) to the top surface of the image sensor (300). When the optical system (1000, 1100) according to the embodiment satisfies Equation 1, the optical system (1000, 1100) can have an appropriate focal length within the set TTL range, and image formation can be achieved while maintaining an appropriate focal length for the mobile optical system. If it is below the lower limit of Equation 1, it is necessary to increase the refractive power of the lenses, making it difficult to correct spherical aberration or distortion aberration; if it exceeds the upper limit of Equation 1, the effective diameter or TTL of the lenses becomes longer, which may cause a problem where the imaging lens system becomes larger. In the first and second embodiments, mathematical formula 1 can preferably satisfy 0.2 < F / TTL < 0.3.

[0332]

[0333] [Mathematical Formula 2]

[0334] 1 < TTL / ImgH < 3

[0335] In Equation 2, TTL (Total track length) refers to the distance (mm) along the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101, 201) to the top surface of the image sensor (300), and ImgH refers to the maximum diagonal length of the image sensor (300). When Equation 2 is satisfied, the optical system (1000, 1100) can have a TTL for application to the mobile image sensor (300), thereby providing improved image quality. If it is below the lower limit of Equation 2, it is necessary to increase the refractive power of the lenses, making it difficult to correct spherical aberration or distortion aberration; if it exceeds the upper limit of Equation 2, the effective aperture or TTL of the lenses becomes longer, which may cause a problem where the imaging lens system becomes larger. In the first and second embodiments, Equation 2 can preferably satisfy 1 < TTL / ImgH < 1.5.

[0336]

[0337] [Mathematical Formula 3]

[0338] 3 < |F1| / F < 5

[0339] In Equation 3, F1 is the focal length of the first lens (101, 201), and F is the effective focal length of the optical system. If Equation 3 is satisfied, the optical system (1000, 1100) can have a set angle of view and an appropriate focal length, and a mobile optical system can be provided. Additionally, the angle of view can be set large within an appropriate TTL range through the first lens (101, 201) having negative (-) refractive power. If it is below the lower limit of Equation 3, the effective aperture or TTL of the lenses becomes longer, which may cause a problem where the imaging lens system becomes large. If it exceeds the upper limit of Equation 3, the influence of the first lens (101, 201) in the entire optical system decreases, and it becomes necessary to increase the refractive power of the lenses, which makes it difficult to correct spherical aberration or distortion aberration. In the first and second embodiments, Equation 3 is preferably such that 3 < |F1| / F < 4 can be satisfied.

[0340]

[0341] [Mathematical Formula 4]

[0342] 1 < |F2| / F < 3

[0343] In Equation 4, F2 is the focal length of the second lens (102, 202), and F is the effective focal length of the optical system. When Equation 4 is satisfied, the optical system (1000, 1100) can have a set angle of view and an appropriate focal length, and a mobile optical system can be provided. If it is less than the lower limit of Equation 4, the effective aperture or TTL of the lenses becomes longer, and a problem may occur where the imaging lens system becomes large. If it exceeds the upper limit of Equation 4, the influence of the second lens (102, 202) is reduced in the entire optical system, and it is necessary to increase the refractive power of the lenses, which makes it difficult to correct spherical aberration or distortion aberration. In the first and second embodiments, Equation 4 can preferably satisfy 1.5 < |F2| / F < 2.

[0344]

[0345] [Mathematical Formula 5]

[0346] 1 < F3 / F < 3

[0347] In Equation 5, F3 is the focal length of the third lens (103, 203), and F is the effective focal length of the optical system. When Equation 5 is satisfied, the optical system (1000, 1100) can have a set angle of view and an appropriate focal length, and a mobile optical system can be provided. If it is less than the lower limit of Equation 5, the effective aperture or TTL of the lenses becomes longer, and a problem may occur where the imaging lens system becomes large. If it exceeds the upper limit of Equation 5, the influence of the third lens (103, 203) in the entire optical system decreases, and it is necessary to increase the refractive power of the lenses, which makes it difficult to correct spherical aberration or distortion aberration. In the first and second embodiments, Equation 5 can preferably satisfy 2 < F3 / F < 3.

[0348]

[0349] [Mathematical Formula 6]

[0350] 1 < F4 / F < 3

[0351] In Equation 6, F4 is the focal length of the fourth lens (104, 204), and F is the effective focal length of the optical system. If Equation 6 is satisfied, aberration characteristics can be secured, and a stable optical system can be formed by forming a smooth optical path at a short TTL. If it is below the lower limit of Equation 6, the effective aperture or TTL of the lenses becomes longer, which may cause a problem where the imaging lens system becomes large. If it exceeds the upper limit of Equation 6, the influence of the fourth lens (104, 204) in the entire optical system decreases, and it becomes necessary to increase the refractive power of the lenses, which makes it difficult to correct spherical aberration or distortion aberration. In the first and second embodiments, Equation 6 can preferably satisfy 2.3 < F4 / F < 3.

[0352]

[0353] [Mathematical Formula 7]

[0354] 1 < |F5| / F < 5

[0355] In Equation 7, F5 is the focal length of the fifth lens (105, 205), and F is the effective focal length of the optical system. If Equation 7 is satisfied, aberration characteristics can be secured, and a stable optical system can be formed by forming a smooth optical path at a short TTL. If it is below the lower limit of Equation 7, the effective diameter or TTL of the lenses becomes longer, which may cause a problem where the imaging lens system becomes large. If it exceeds the upper limit of Equation 7, the influence of the fifth lens (105, 205) in the entire optical system decreases, and it is necessary to increase the refractive power of the lenses, which makes it difficult to correct spherical aberration or distortion aberration. In the first and second embodiments, Equation 7 can preferably satisfy 2 < |F5| / F < 4.

[0356]

[0357] [Mathematical Formula 8]

[0358] 1.5 < n5 < 1.7

[0359] In Equation 8, n5 is the refractive index of the fifth lens (105, 205). When Equation 8 is satisfied, the fifth lens (105, 205) has a high refractive index among plastic lenses, thereby minimizing chromatic aberration. In the first and second embodiments, Equation 8 can preferably satisfy 1.6 < n5 < 1.68.

[0360]

[0361] [Mathematical Formula 9]

[0362] 15 < v5 < 25

[0363] In Equation 9, v5 is the Abbe number of the fifth lens (105, 205). When Equation 9 is satisfied, the fifth lens (105, 205) is made of a low-dispersion material among plastic lenses, so chromatic aberration can be minimized. In the first and second embodiments, Equation 9 can preferably satisfy 18 < v5 < 22.

[0364]

[0365] [Mathematical Formula 10]

[0366] 1 < F6 / F < 2

[0367] In Equation 10, F6 is the focal length of the sixth lens (106, 206), and F is the effective focal length of the optical system. When Equation 10 is satisfied, the optical system (1000, 1100) can have a set angle of view and an appropriate focal length, and a mobile optical system can be provided. If it is less than the lower limit of Equation 10, the effective aperture or TTL of the lenses becomes longer, and a problem may occur where the imaging lens system becomes large. If it exceeds the upper limit of Equation 10, the influence of the sixth lens (106, 206) in the entire optical system decreases, and it is necessary to increase the refractive power of the lenses, which makes it difficult to correct spherical aberration or distortion aberration. In the first and second embodiments, Equation 10 can preferably satisfy 1 < F6 / F < 1.5.

[0368]

[0369] [Mathematical Formula 11]

[0370] 1 < |F7| / F < 2

[0371] In Equation 11, F7 is the focal length of the seventh lens (107, 207), and F is the effective focal length of the optical system. When Equation 11 is satisfied, the optical system (1000, 1100) can have a set angle of view and an appropriate focal length, and a mobile optical system can be provided. If it is less than the lower limit of Equation 11, the effective aperture or TTL of the lenses becomes longer, and a problem may occur where the imaging lens system becomes large. If it exceeds the upper limit of Equation 11, the influence of the seventh lens (107, 207) in the entire optical system decreases, and it is necessary to increase the refractive power of the lenses, which makes it difficult to correct spherical aberration or distortion aberration. In the first and second embodiments, Equation 11 can preferably satisfy 1.5 < |F7| / F < 2.

[0372]

[0373] [Mathematical Formula 12]

[0374] 3 < CA_L1S1 / F < 5

[0375] In Equation 12, CA_L1S1 is the effective diameter of the object side (first surface (S1)) 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 Equation 12, the effective diameter of the lens placed in the optical system (1000, 1100) becomes the largest, and there is a problem that the TTL becomes longer as a result. If it exceeds the upper limit of Equation 12, there is a problem that the angle of view becomes excessively larger than the angle of view satisfied by the optical system (1000, 1100). In the first and second embodiments, Equation 12 can preferably satisfy 3.3 < CA_L1S1 / F < 4.7.

[0376]

[0377] [Mathematical Formula 13]

[0378] 2 < F / EPD < 3

[0379] In Equation 13, F is the effective focal length of the optical system, and EPD represents the diameter of the entrance pupil (effective aperture). When Equation 23 is satisfied, an image with brightness suitable for shooting can be provided, and a large amount of light can be received by the image sensor. In the first and second embodiments, Equation 13 can preferably satisfy 2.3 < F / EPD < 2.6.

[0380]

[0381] [Mathematical Formula 14]

[0382] 0.1 < BFL / TTL < 0.5

[0383] In Equation 14, BFL represents 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) represents the distance (mm) along the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101, 201) to the top surface of the image sensor (300). When Equation 14 is satisfied, the optical system (1000, 1100) can have a set angle of view and an appropriate focal length, and a mobile optical system can be provided. Additionally, the optical system (1000, 1100) can minimize the gap between the last lens and the image sensor (300), thereby having good optical characteristics at the periphery of the angle of view (FOV). In the first and second embodiments, Equation 14 preferably satisfies 0.1 < BFL / TTL < 0.3.

[0384]

[0385] [Mathematical Formula 15]

[0386] 0.1 < CA_L4 / TTL < 0.5

[0387] In Equation 15, CA_L4 is the size of the effective aperture of the fourth lens (104, 204), and TTL (Total track length) represents the distance (mm) along the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101, 201) to the top surface of the image sensor (300). When Equation 15 is satisfied, the entire optical system (1000, 1100) can be made to have a short focal length within an appropriate TTL. In the first and second embodiments, Equation 15 can preferably satisfy 0.1 < CA_L4 / TTL < 0.3.

[0388]

[0389] [Mathematical Formula 16]

[0390] 0.5 < CT_Max / CG_Max < 1.5

[0391] In Equation 16, CT_Max is the maximum center thickness among the lenses, and CG_Max is the maximum distance between adjacent lenses. If Equation 16 is satisfied, the optical system can have good optical performance at the focal length at the set angle of view and can reduce TTL. In the first and second embodiments, Equation 16 can preferably satisfy 0.8 < CT_Max / CG_Max < 1.2.

[0392]

[0393] [Mathematical Formula 17]

[0394] 5 < CA_max / CA_min < 7

[0395] In Equation 17, CA_max represents the maximum effective diameter among the object sides and sensor sides of the lenses, and CA_Min represents the minimum effective diameter among the object sides and sensor sides of the lenses. When Equation 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, Equation 17 can preferably satisfy 5 < CA_max / CA_min < 6.5.

[0396]

[0397] [Mathematical Formula 18]

[0398] 0.5 < ΣCG / ΣCT < 1

[0399] In Equation 18, ΣCT is the sum of the center thicknesses of the lenses, and ΣCG is the sum of the spacings between adjacent lenses. If Equation 18 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 18 can preferably satisfy 0.6 < ΣCG / ΣCT < 0.8.

[0400]

[0401] [Mathematical Formula 19]

[0402] 0.1 < CG1 / ΣCG < 0.5

[0403] In Equation 19, CG1 is the center distance between the first lens (101, 201) and the second lens (102, 202), and ΣCG is the sum of the distances between adjacent lenses. When Equation 19 is satisfied, the light emitted from the first lens (101, 201), which has a significant influence on the entire optical system, establishes a light path 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, Equation 19 can preferably satisfy 0.3 < CG1 / ΣCG < 0.5.

[0404]

[0405] [Mathematical Formula 20]

[0406] 0.1 < CG1 / ΣCT < 0.5

[0407] In Equation 20, CG1 is the center distance between the first lens (101, 201) and the second lens (102, 202), and ΣCT is the sum of the center thicknesses of the lenses. When Equation 20 is satisfied, the light emitted from the first lens (101, 201), which has a large influence on the entire optical system, establishes a light path 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, Equation 20 can preferably satisfy 0.1 < CG1 / ΣCT < 0.3.

[0408]

[0409] [Mathematical Formula 21]

[0410] 180 < FOV_D < 240

[0411] In mathematical formula 21, 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, 190 < FOV_D < 230 can be satisfied.

[0412]

[0413] [Mathematical Formula 22]

[0414] 1 < TTL / CA_max < 3

[0415] In Equation 22, TTL (Total track length) represents the distance (mm) along the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101, 201) to the top surface of the image sensor (300), and CA_max represents the maximum effective diameter among the object sides and sensor sides of the lenses. When Equation 22 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, Equation 22 preferably satisfies 1 < TTL / CA_max < 1.5.

[0416]

[0417] [Mathematical Formula 23]

[0418] 40 < TTL < 50

[0419] In Equation 23, TTL (Total track length) refers to the distance (mm) along the optical axis (OA) from the center of the first surface (S1) of the first lens (101, 201) to the top surface of the image sensor (300). If Equation 23 is satisfied, a suitable mobile optical system can be provided. In the first and second embodiments, Equation 23 can preferably satisfy 42 < TTL < 48.

[0420]

[0421] [Mathematical Formula 24]

[0422] 30 < ImgH < 40

[0423] In Equation 24, ImgH represents the maximum diagonal length of the image sensor (300). Equation 24 can set the diagonal size of the image sensor (300) and can provide an optical system having a mobile image sensor size. In the first embodiment, Equation 24 can preferably satisfy 34 < ImgH < 36. In the second embodiment, Equation 24 can preferably satisfy 37 < ImgH < 39.

[0424]

[0425] [Mathematical Formula 25]

[0426] 7 < BFL < 10

[0427] In Equation 25, BFL is the optical axis distance from the image sensor (300) to the center of the sensor side of the last lens. If Equation 25 is satisfied, installation space for the filter (400) and cover glass can be secured, and the assembly of components and coupling reliability can be improved through the gap between the image sensor (300) and the last lens. If BFL is less than the range of Equation 25, some light proceeding to the image sensor may not be transmitted to the image sensor, which may cause a decrease in resolution. If BFL exceeds the range of Equation 25, stray light may be introduced, which may degrade the aberration characteristics of the optical system. In the first and second embodiments, Equation 25 preferably satisfies 8 < BFL < 9.

[0428]

[0429] [Mathematical Formula 26]

[0430] 9 < F < 12

[0431] Equation 26 can set the total focal length (F) to fit the mobile optical system. In the first and second embodiments, Equation 26 can satisfy 9 < F < 11.

[0432]

[0433] [Mathematical Formula 27]

[0434] 25 < 0.8 Field_R1 < 40

[0435] When the point where it meets the optical axis (OA) on the upper surface of the image sensor (300) is the 0 Field and the end of the effective area of ​​the image sensor (300) is the 1 Field, the light incident on the 0.8 Field may be an incident ray that mainly tests the optical performance of the optical system. Among the light incident on the 0.8 Field, the ray located at the top may be referred to as the upper ray R2, the ray located at the bottom may be referred to as the lower ray R3, and the ray located at the center of the upper ray R2 and the lower ray R3 may be referred to as the center ray R1. In Equation 27, 0.8 Field_R1 may represent the angle (degree) between the center ray R1 among the light rays incident on the 0.8 Field of the image sensor (300) and the normal of the upper surface of the image sensor (300). The angle (degree) formed by the upper ray R2 and the lower ray R3 may be less than 15 degrees. If mathematical formula 27 is satisfied, the performance of the optical system (1000, 1100) designed to enlarge the image sensor (300) can be secured. In the first and second embodiments, mathematical formula 27 can satisfy 28 < 0.8 Field_R1 < 30.

[0436]

[0437] [Mathematical Formula 28]

[0438]

[0439] In Equation 28, Z represents Sag, which can mean the distance in the direction of the optical axis from any position on the aspherical surface to the vertex of the aspherical surface. Y represents the distance in the direction perpendicular to the optical axis from any position on the aspherical surface to the optical axis. c can represent the curvature of the lens, and K can represent the conic constant. Additionally, A, B, C, D, E, and F can represent the aspheric constants.

[0440]

[0441] The optical system (1000, 1100) according to the first and second embodiments may satisfy at least one or two of the mathematical formulas 1 to 28. In this case, the optical system (1000, 1100) may have improved optical characteristics. Specifically, when the optical system (1000, 1100) satisfies at least one or two of the mathematical formulas 1 to 28, the optical system (1000, 1100) may have improved resolution and may improve aberration and distortion characteristics. In addition, the optical system (1000, 1100) may secure a Back Focal Length (BFL) for applying the image sensor (300), compensate for the degradation of optical characteristics due to temperature changes, and minimize the gap between the last lens and the image sensor (300), thereby having good optical performance in the center and periphery of the field of view (FOV).

[0442]

[0443] Table 5 shows the result values ​​for the above-described Equations 1 to 27 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 Equations 1 to 27. Specifically, it can be seen that the optical system (1000, 1100) according to the embodiment satisfies all of Equations 1 to 27. 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).

[0444] Mathematical formula Example 1 Example 2 0.1 < F / TTL < 0.5 0.228 0.211 21 < TTL / ImgH < 31.250 1.239 33 < |F1| / F < 5 3.595 3.460 41 < |F2| / F < 3 1.663 1.903 51 < F3 / F < 3 2.498 2.987 61 < F4 / F < 3 1.277 1.401 71 < |F5| / F < 5 2.855 3.247 81.5 < n5 < 1.7 1.658 1.662 915 < v5 < 25 20.276 19.953 101 < F6 / F < 2 1.251 1.223 111 < |F7| / F < 2 1.920 1.711 123 < CA_L1S1 / F < 5 3.593 4.646 132 < F / EPD < 3 2.400 2.400 140.1 < BFL / TTL < 0.5 0.195 0.182 150.1 < CA_L4 / TTL < 0.5 0.187 0.161 160.5 < CT_Max / CG_Max < 1.5 1.009 1.191 175 < CA_max / CA_min < 7 5.168 6.267 180.5 < ΣCG / ΣCT < 10 0.700 0.765 190.1 < CG1 / ΣCG < 0.5 0.427 0.313 200.1 < CG1 / ΣCT < 0.5 0.299 0.239 21180 < FOV_D < 240 193.700 220.000 221 < TTL / CA_max < 3 1.222 1.021 2340 < TTL < 50 43.902 47.440 2430 < ImgH < 40 35.122 38.284 257 < BFL < 10 8.560 8.630 269 < F < 12 10 10 2725 < 0.8 Field_R1 < 40 29 29

[0445] Hereinafter, a camera module according to an embodiment of the present invention will be described with reference to the drawings.

[0446] FIG. 9 is an exploded perspective view of a camera device according to an embodiment of the present invention.

[0447] The camera device (10A) may include a camera module.

[0448] 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 at a location 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 drive 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).

[0449] The camera device (10A) may include a filter (30). The filter (30) may serve to block light of a specific frequency band from passing through the lens module (20) from entering the image sensor (300). The filter (30) may be positioned parallel to the xy plane. The filter (30) may be positioned between the lens module (20) and the image sensor (300). The filter (30) may be positioned on the sensor base (40). As a variation, the filter (30) may be positioned 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 entering the image sensor (300).

[0450] The camera device (10A) may include a sensor base (40). The sensor base (40) may be positioned 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 placed. An opening may be formed in the portion of the sensor base (40) on which the filter (30) is placed so that light passing through the filter (30) can be incident on the image sensor (300). An adhesive member (45) may bond or bond 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 one or more of epoxy, thermosetting adhesive, and UV-curing adhesive.

[0451] The camera device (10A) may include a printed circuit board (50) (PCB). The printed circuit board (50) may be a board 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). The printed circuit board (50) may be equipped with various circuits, components, control units, etc., to convert an image formed on the image sensor (300) into an electrical signal and transmit it to an external device.

[0452] The camera device (10A) may include an image sensor (300). The image sensor (300) may be configured such that an image is formed when light passing through a lens and a filter (30) is incident. 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) by Surface Mounting Technology (SMT). As another example, the image sensor (300) may be coupled to the printed circuit board (50) by flip chip technology. The image sensor (300) may be positioned so that its optical axis coincides 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 an effective image area of ​​the image sensor (300) into an electrical signal. The image sensor (300) may be any one of a CCD (charge coupled device), a MOS (metal oxide semiconductor), a CPD, and a CID.

[0453] 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 based on the movement of the camera device (10A). The motion sensor (70) may include a 2-axis or 3-axis gyro sensor or an angular velocity sensor.

[0454] The camera device (10A) may include a control unit (80). The control unit (80) may be placed on a printed circuit board (50). The control unit (80) may be electrically connected to the AF coil and OIS coil of the lens driving device (10B). The control unit (80) may individually control the direction, strength, and amplitude of the current supplied to the AF coil and OIS coil. The control unit (80) may control the lens driving device (10B) to perform an autofocus function and / or a hand image correction function. Furthermore, the control unit (80) may perform autofocus feedback control and / or hand image correction feedback control for the lens driving device (10B).

[0455] 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.

[0456]

[0457] 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 only one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment may be combined or modified and implemented in other embodiments by a person skilled in the art to which the embodiments belong. Therefore, details regarding such combinations and modifications should be interpreted as being included within the scope of the present invention.

[0458] Furthermore, although the invention has been described above with reference to embodiments, this is merely illustrative and does not limit the invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments may be modified and implemented. Differences related to such modifications and applications should be interpreted as being included within the scope of the invention as defined in the appended claims.

Claims

It includes first to seventh lenses arranged along the optical axis, and The first lens above has a negative (-) refractive power, and The second lens above has a negative (-) refractive power, and The above-mentioned sixth lens has a positive (+) refractive power, and The above seventh lens has a negative (-) refractive power, and An optical system in which the thickness of the third lens at the above optical axis is greater than the thickness of the fourth lens. In paragraph 1, An optical system in which the size of the effective aperture of the second lens is smaller than the size of the effective aperture of the seventh lens. In paragraph 1, The third lens on the above optical axis is an optical system having a shape with both sides convex. In paragraph 1, An optical system in which the distance between the second lens and the third lens on the above optical axis is greater than the thickness of the third lens. In paragraph 1, The above third lens has a positive (+) refractive power, and The above-mentioned fourth lens has a positive (+) refractive power, and The above-mentioned fifth lens is an optical system having negative (-) refractive power. In any one of paragraphs 1 through 5, An optical system satisfying the following condition. <Condition> 30 < ImgH < 40 (In the above conditional expression, ImgH represents the maximum diagonal length of the image sensor.) In any one of paragraphs 1 through 5, An optical system satisfying the following condition. <Condition> 1 < TTL / ImgH < 3 (In the above conditional equation, TTL refers to the distance from the object side of the first lens to the top surface of the image sensor along the optical axis, and ImgH refers to the maximum diagonal length of the image sensor.) In any one of paragraphs 1 through 5, An optical system satisfying the following condition. <Condition> 5 < CA_max / CA_min < 7 (In the above conditional expression, CA_max refers to the maximum effective diameter among the object sides and sensor sides of the lenses, and CA_Min refers to the minimum effective diameter among the object sides and sensor sides of the lenses.) It includes first to seventh lenses arranged along the optical axis, and The first lens above has a negative (-) refractive power, and The second lens above has a negative (-) refractive power, and The above third lens has a positive (+) refractive power, and The above-mentioned fourth lens has a positive (+) refractive power, and The above fifth lens has a negative (-) refractive power, and An optical system in which the size of the effective aperture of the second lens is smaller than the size of the effective aperture of the seventh lens. In Paragraph 9, The third lens on the above optical axis is an optical system having a shape with both sides convex.

Images