Optical system and camera module including the same

Abstract

An optical system according to an embodiment includes first to seventh lenses arranged along an optical axis in a direction from the object side to the image side, the object side surface of the first lens has a convex shape, the object side surface of the fifth lens has a convex shape, and the object side surface of the seventh lens has a concave shape, and the first lens can satisfy the formula 0.28<|L1R1| / |f1|<0.41 (L1R1 is the radius of curvature of the object side surface of the first lens, and f1 is the focal length of the first lens).

Description

Technical Field

[0001] Embodiments relate to an optical system for improved optical performance and a camera module including the same.

Background Art

[0002] A camera module performs a function of taking an object and storing it as an image or video, and is mounted in various applications. In particular, the camera module is manufactured in a super-small size and is applied not only to portable devices such as smartphones, tablet PCs, and notebook computers, but also to drones, vehicles, etc., providing various functions. For example, the optical system of the camera module may include an imaging lens that forms an image and an image sensor that converts the formed image into an electrical signal. At this time, the camera module can perform an autofocus (AF) function of automatically adjusting the distance between the image sensor and the imaging lens to align the focal length of the lens, and can perform a zooming function of zooming in (zoom up) or zooming out (zoom out) by increasing or decreasing the magnification of a distant object through a zoom lens. Also, the camera module employs an image stabilization (IS) technology to correct or prevent image blur caused by camera movement due to an unstable fixing device or user movement.

[0003] The most important element for such a camera module to obtain an image is the imaging lens that forms the image. Recently, there has been growing interest in high resolution, and research is underway to realize this using five or six lenses. For example, research is underway to achieve high resolution using multiple imaging lenses with positive (+) or negative (-) refractive power. However, when multiple lenses are arranged, there is a problem in that it is difficult to derive excellent optical properties and aberration characteristics. In addition, when multiple lenses are included, the overall length and height may increase due to the thickness, spacing, and size of the multiple lenses, which increases the overall size of the module containing the multiple lenses. Furthermore, the size of image sensors is increasing in order to realize high resolution and high image quality. However, when the size of the image sensor increases, the TTL (Total Track Length) of the optical system containing multiple lenses also increases, which increases the thickness of the camera or mobile device containing the optical system. Therefore, there is a need for a new optical system that can solve the above problems. [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] The embodiment aims to provide an optical system with improved optical properties. The embodiment also aims to provide an optical system that can have a slim structure. [Means for solving the problem]

[0005] An optical system according to an embodiment of the present invention includes first to seventh lenses arranged along the optical axis from the object side to the image side, wherein the object side of the first lens is convex, the object side of the fifth lens is convex, the object side of the seventh lens is concave, and the first lens can satisfy the formula 0.28 < |L1R1| / |f1| < 0.41 (where L1R1 is the radius of curvature of the object side of the first lens and f1 is the focal length of the first lens).

[0006] Furthermore, the first lens can satisfy the formula n1d < 1.51 (where n1d is the refractive index of the first lens with respect to the d-line wavelength).

[0007] Furthermore, the first lens can satisfy the equation 0.29 < |L1R1| / |L1R2| < 0.45 (where L1R1 is the radius of curvature of the object side of the first lens, and L1R2 is the radius of curvature of the image side of the first lens).

[0008] Furthermore, the fifth to seventh lenses can satisfy the formula 0.18 < (d56 + d67) / TD < 0.35 (where d56 is the distance along the optical axis between the image side of the fifth lens and the object side of the sixth lens, d67 is the distance along the optical axis between the image side of the sixth lens and the object side of the seventh lens, and TD is the distance along the optical axis from the vertex of the object side of the first lens to the vertex of the image side of the seventh lens).

[0009] The system further includes an eighth lens positioned between the seventh lens and the image sensor, wherein the first and eighth lenses can satisfy the formula |L1R1| / |L8R2|<0.1 (where L1R1 is the radius of curvature of the object side of the first lens, and L8R2 is the radius of curvature of the image side of the eighth lens).

[0010] An optical system according to an embodiment of the present invention includes first to seventh lenses arranged along the optical axis from the object side to the image side, wherein the peripheral portion of the image side surface of the seventh lens is convex, and the tangential angle at the image side surface of the seventh lens may be 40 degrees or more, corresponding to a region of 0.65 times or more the shortest distance from the central axis to the end of the image side surface of the seventh lens.

[0011] According to embodiments of the present invention, the seventh lens may have a tangent angle of 40 to 50 degrees at the image side of the seventh lens corresponding to a region of 0.65 to 0.75 times the shortest distance from the central axis to the end of the image side of the seventh lens. The seventh lens may have a tangent angle of 50 degrees or more at the image side of the seventh lens corresponding to a region of 0.75 times or more the shortest distance from the central axis to the end of the image side of the seventh lens. The seventh lens may have a tangent angle of 60 degrees or more at the image side of the seventh lens corresponding to a region of 0.8 times or more the shortest distance from the central axis to the end of the image side of the seventh lens.

[0012] According to an embodiment of the present invention, the sixth lens may have a tangent angle of 40 degrees or more at the object side of the sixth lens corresponding to a region of 0.65 times or more the shortest distance from the central axis to the end of the object side of the sixth lens.

[0013] According to an embodiment of the present invention, the distance between the region where the tangent angle of the image side surface of the seventh lens is 40 degrees or more and the optical axis, with respect to the direction perpendicular to the optical axis, may be greater than the distance between the region where the tangent angle of the object side surface of the sixth lens is 40 degrees or more and the optical axis.

[0014] According to an embodiment of the present invention, the fifth lens may have a tangent angle of 50 degrees or more at the object side of the fifth lens corresponding to a region of 0.75 times or more the shortest distance from the central axis to the end of the object side of the fifth lens.

[0015] According to embodiments of the present invention, the sixth lens may have a tangent angle of 50 degrees or more at the object side of the sixth lens corresponding to a region of 0.75 times or more the shortest distance from the central axis to the end of the object side of the sixth lens. The third lens may have a positive refractive power. The third lens may have a meniscus shape that is convex toward the object side. The sixth lens may have a positive refractive power.

[0016] An optical system according to one embodiment of the present invention includes a lens group comprising three or more lenses arranged sequentially along the optical axis from the object side to the image side, wherein at least one lens of the lens group may have at least one lens surface on the object side and the image side having a 30th-order aspheric coefficient.

[0017] According to an embodiment of the present invention, the lens group includes seven or more lenses, and at least three of the seven lenses can have a 30th-order aspheric coefficient. [Effects of the Invention]

[0018] The optical system and camera module according to the embodiment can have improved optical characteristics. Specifically, the plurality of lenses of the optical system can have a set shape, center thickness, distance between centers, focal length, etc. Furthermore, at least one of the plurality of lenses may have a shape in which the peripheral part is greatly curved. As a result, the optical system can effectively correct aberrations in the peripheral part (the area of ​​65% or more of the field of view FOV), and thus can have improved optical characteristics.

[0019] Furthermore, at least one of the multiple lenses in the embodiment may include a lens surface having a 30th-order aspheric coefficient. This allows the optical system to effectively correct aberration characteristics in the peripheral area and improve the optical performance in the peripheral area.

[0020] Furthermore, the optical system according to the embodiment can have a slim structure. This makes it possible to provide a device including the optical system, such as the camera module, in a slimmer and more compact form. [Brief explanation of the drawing]

[0021] [Figure 1] This is a diagram showing the configuration of the optical system according to the first embodiment. [Figure 2] This is a diagram illustrating the tangent angle at an arbitrary point in the optical system according to the first embodiment. [Figure 3] It is a diagram for explaining the tangent angle at an arbitrary point in the optical system according to the first embodiment. [Figure 4] It is a diagram for explaining the tangent angle at an arbitrary point in the optical system according to the first embodiment. [Figure 5] It is a graph showing the aberration characteristics of the optical system according to the first embodiment. [Figure 6] It is a configuration diagram of the optical system according to the second embodiment. [Figure 7] It is a graph showing the aberration characteristics of the optical system according to the second embodiment. [Figure 8] It is a configuration diagram of the optical system according to the third embodiment. [Figure 9] It is a graph showing the aberration characteristics of the optical system according to the third embodiment. [Figure 10] It is a configuration diagram of the optical system according to the fourth embodiment. [Figure 11] It is a graph showing the aberration characteristics of the optical system according to the fourth embodiment. [Figure 12] It is a configuration diagram of the optical system according to the fifth embodiment. [Figure 13] It is a graph showing the aberration characteristics of the optical system according to the fifth embodiment. [Figure 14] It is a configuration diagram of the optical system according to the sixth embodiment. [[ID=3,6]] [Figure 15] It is a graph showing the aberration characteristics of the optical system according to the sixth embodiment. [Figure 16] It is a diagram showing that the camera module according to the embodiment is applied to a mobile terminal.

Embodiments for Carrying Out the Invention

[0022] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. However, the technical concept of the present invention is not limited to the embodiments described, but can be embodied in a variety of different forms, and within the scope of the technical concept of the present invention, one or more of its components can be selectively combined and substituted between embodiments. Furthermore, terms used in embodiments of the present invention (including technical and scientific terms) may be interpreted as having a meaning that can be generally understood by a person with ordinary skill in the art to which the present invention belongs, unless they are clearly specifically defined and described, and commonly used terms, such as those defined in dictionaries, may be interpreted in consideration of their meaning in the context of the relevant art.

[0023] Furthermore, the terminology used in the embodiments of the present invention is for illustrative purposes only and is not intended to limit the invention. In this specification, singular nouns may also include plural nouns unless otherwise specified in the text, and when it is written "A and / or at least one of B, C," it may include one or more of all possible combinations of A, B, and C. In addition, when describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. Such terms are merely for distinguishing a component from other components and do not limit the nature, order, or sequence of the component in question. When it is written that a component is "connected," "joined," or "linked" to another component, this may include not only cases where the component is directly connected, joined, or linked to the other component, but also cases where it is "connected," "joined," or "linked" by another component between it and the other component. Furthermore, when it is stated that something is formed or positioned "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 positioned between the two components. Also, when expressed as "above or below," it can include not only the upward direction but also the downward direction with respect to one component.

[0024] A convex lens surface means that the lens surface in the region corresponding to the optical axis is convex, and a concave lens surface means that the lens surface in the region corresponding to the optical axis is concave. "Object side" can mean the lens surface facing the object with respect to the optical axis, and "image side" can mean the lens surface facing the imaging surface (image sensor) with respect to the optical axis. The vertical direction can mean the direction perpendicular to the optical axis, and the end of the lens or lens surface can mean the end of the effective region of the lens through which the incident light passes.

[0025] The optical system 1000 according to the embodiment may include a plurality of lenses 100 and an image sensor 300. More specifically, the optical system 1000 according to the embodiment may include a lens group containing three or more lenses. For example, the optical system 1000 may include a lens group containing seven lenses. The optical system 1000 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an image sensor 300, which are arranged sequentially from the object side to the image side. The first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 may be arranged sequentially along the optical axis OA of the optical system 1000. In this case, the light corresponding to the information of the object can pass through the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 15, the sixth lens 160, and the seventh lens 170 and be incident on the image sensor 300.

[0026] Each of the plurality of lenses 100 may include an effective region and an ineffective region. The effective region may be the region through which light incident on each of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 passes. That is, the effective region may be the region through which incident light is refracted and exhibits optical properties. The ineffective region may be arranged around the effective region. The ineffective region may be a region through which no light is incident. That is, the ineffective region may be a region unrelated to the optical properties. The ineffective region may also be a region fixed to a barrel (not shown) that houses the lens. The image sensor 300 can sense light. More specifically, the image sensor 300 can sense light that has passed sequentially through the plurality of lenses 100, specifically the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170. The image sensor 300 may include an element capable of sensing incident light, such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor).

[0027] The optical system 1000 according to the embodiment may further include a filter 500. The filter 500 may be positioned between the plurality of lenses 100 and the image sensor 300. The filter 500 may be positioned between the last lens (seventh lens 170) of the plurality of lenses 100 that is closest to the image sensor 300 and the image sensor 300. The filter 500 may include at least one optical filter such as an infrared filter or a cover glass. The filter 500 can allow light in a set wavelength band to pass through and filter out light in a different wavelength band. If the filter 500 includes an infrared filter, it can block radiant heat emitted from external light from being transmitted to the image sensor 300. The filter 500 can also transmit visible light and reflect infrared light.

[0028] The optical system 1000 according to the embodiment may include an aperture (not shown). The aperture can adjust the amount of light incident on the optical system 1000. The aperture can be positioned at a set location. For example, the aperture can be located in front of the first lens 110 or behind the first lens 110. Alternatively, the aperture can be positioned between two lenses selected from the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170. As an example, the aperture can be located behind the object side of the first lens 110. Also, at least one of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 can act as an aperture. For example, the object side or image side of one lens selected from the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 can act as an aperture to adjust the amount of light. For example, the object side (third surface S3) of the second lens 120 can function as an aperture.

[0029] The optical system 1000 according to the embodiment may further include an optical path changing member (not shown). The optical path changing member can change the path of light by reflecting light incident from the outside. The optical path changing member may include a reflector or a prism. For example, the optical path changing member may include a right-angle prism. If the optical path changing member includes a right-angle prism, the optical path changing member can change the path of light by reflecting the path of incident light at a 90-degree angle. The optical path changing member may be positioned adjacent to the object side of the first to seventh lenses 110, 120, 130, 140, 150, 160, 170. For example, if the optical system 1000 includes the optical path changing member, the optical path changing member, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, the seventh lens 170, the filter 500, and the image sensor 300 may be arranged in that order from the object side to the image side. The optical path changing member can reflect light incident from the outside and change the path of the light in a set direction. The optical path changing member can reflect light incident on the optical path changing member and change the path of the light in the direction of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170. If the optical system 1000 includes the optical path changing member, the optical system can be applied to a folded camera that can reduce the thickness of the camera. In more detail, if the optical system 1000 includes the optical path changing member, it can change light incident perpendicular to the surface of the applied device to a direction parallel to the surface of the device. As a result, the optical system 1000, which includes multiple lenses, can have a thinner thickness within the device, and thus the device can be made thinner.

[0030] More specifically, if the optical system 1000 does not include the optical path changing member, the plurality of lenses 100 within the device may be arranged to extend in a direction toward an object, for example, in a direction perpendicular to the surface of the device. As a result, the optical system 1000 including the plurality of lenses may have a high height in the direction perpendicular to the surface of the device, making it difficult to form the device with a thin thickness. However, if the optical system 1000 includes the optical path changing member, it can be applied to a folded camera, and the plurality of lenses may be arranged to extend in a direction perpendicular to the direction toward an object, for example, in a direction parallel to the surface. That is, the optical system 1000 may be arranged such that the optical axis OA is parallel to the surface of the device. As a result, the optical system 1000 including the plurality of lenses may have a low height in the direction perpendicular to the surface of the device. Therefore, a folded camera including the optical system 1000 may have a thin thickness within the device, and the thickness of the device may also be reduced.

[0031] Multiple lenses 100 according to the following embodiments will be described in more detail. The first lens 110 may have a positive (+) refractive power at the optical axis OA. The first lens 110 may be made of plastic or glass material. For example, the first lens 110 may be made of plastic material. The first lens 110 may include a first surface S1 defined as an object side surface and a second surface S2 defined as an image side surface. The first surface S1 may be convex at the optical axis OA, and the second surface S2 may be concave at the optical axis OA. That is, the first lens 110 may have a meniscus shape that is convex towards the object side at the optical axis OA. At least one of the first surface S1 and the second surface S2 may be aspherical. For example, both the first surface S1 and the second surface S2 may be aspherical. At least one of the first surface S1 and the second surface S2 may be aspherical having a 30th-order aspheric coefficient.

[0032] The second lens 120 may have a positive (+) or negative (-) refractive power in the optical axis OA. The second lens 120 may be made of plastic or glass material. For example, the second lens 120 may be made of plastic material. The second lens 120 may include a third surface S3 defined as an object side and a fourth surface S4 defined as an image side. The third surface S3 may be convex in the optical axis OA, and the fourth surface S4 may be concave in the optical axis OA. That is, the second lens 120 may have a meniscus shape that is convex towards the object side in the optical axis OA. Alternatively, the third surface S3 may be convex in the optical axis OA, and the fourth surface S4 may be convex. That is, both sides of the second lens 120 may be convex in the optical axis OA. Alternatively, the third surface S3 may be concave in the optical axis OA, and the fourth surface S4 may be convex in the optical axis OA. That is, the second lens 120 may have a meniscus shape that is convex towards the image side in the optical axis OA. In contrast, the third surface S3 may be concave in the optical axis OA, and the fourth surface S4 may be concave in the optical axis OA. That is, both surfaces of the second lens 120 may be concave in the optical axis OA. At least one of the third surface S3 and the fourth surface S4 may be aspherical. For example, both the third surface S3 and the fourth surface S4 may be aspherical. At least one of the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient.

[0033] The third lens 130 may have a positive (+) or negative (-) refractive power in the optical axis OA. The third lens 130 may be made of plastic or glass material. For example, the third lens 130 may be made of plastic material. The third lens 130 may include a fifth surface S5 defined as an object side and a sixth surface S6 defined as an image side. The fifth surface S5 may be convex in the optical axis OA, and the sixth surface S6 may be concave in the optical axis OA. That is, the third lens 130 may have a meniscus shape that is convex towards the object side in the optical axis OA. Alternatively, the fifth surface S5 may be convex in the optical axis OA, and the sixth surface S6 may be convex in the optical axis OA. That is, both sides of the third lens 130 may be convex in the optical axis OA. Alternatively, the fifth surface S5 may be concave in the optical axis OA, and the sixth surface S6 may be convex in the optical axis OA. That is, the third lens 130 may have a meniscus shape that is convex towards the image side in the optical axis OA. In contrast, the fifth surface S5 may be concave in the optical axis OA, and the sixth surface S6 may be concave in the optical axis OA. That is, both surfaces of the third lens 130 may be concave in the optical axis OA. At least one of the fifth surface S5 and the sixth surface S6 may be aspherical. For example, both the fifth surface S5 and the sixth surface S6 may be aspherical. At least one of the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient.

[0034] The fourth lens 140 may have a positive (+) or negative (-) refractive power in the optical axis OA. The fourth lens 140 may be made of plastic or glass material. For example, the fourth lens 140 may be made of plastic material. The fourth lens 140 may include a seventh surface S7 defined as an object side and an eighth surface S8 defined as an image side. The seventh surface S7 may be convex in the optical axis OA, and the eighth surface S8 may be concave in the optical axis OA. That is, the fourth lens 140 may have a meniscus shape that is convex towards the object side in the optical axis OA. Alternatively, the seventh surface S7 may be convex in the optical axis OA, and the eighth surface S8 may be convex in the optical axis OA. That is, both sides of the fourth lens 140 may be convex in the optical axis OA. Alternatively, the seventh surface S7 may be concave in the optical axis OA, and the eighth surface S8 may be convex in the optical axis OA. That is, the fourth lens 140 may have a meniscus shape that is convex towards the image side in the optical axis OA. In contrast, the seventh surface S7 may be concave in the optical axis OA, and the eighth surface S8 may be concave in the optical axis OA. That is, both surfaces of the fourth lens 140 may be concave in the optical axis OA. At least one of the seventh surface S7 and the eighth surface S8 may be aspherical. For example, both the seventh surface S7 and the eighth surface S8 may be aspherical. At least one of the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspheric coefficient.

[0035] The fifth lens 150 may have a positive (+) or negative (-) refractive power in the optical axis OA. The fifth lens 150 may be made of plastic or glass material. For example, the fifth lens 150 may be made of plastic material. The fifth lens 150 may include a ninth surface S9 defined as an object side surface and a tenth surface S10 defined as an image side surface. The ninth surface S9 may be convex in the optical axis OA, and the tenth surface S10 may be concave in the optical axis OA. That is, the fifth lens 150 may have a meniscus shape that is convex toward the object side in the optical axis OA. At least one of the ninth surface S9 and the tenth surface S10 may be aspherical. For example, both the ninth surface S9 and the tenth surface S10 may be aspherical. At least one of the ninth surface S9 and the tenth surface S10 may be aspherical having a 30th-order aspheric coefficient.

[0036] The sixth lens 160 may have a positive refractive power in the optical axis OA. The sixth lens 160 may be made of plastic or glass material. For example, the sixth lens 160 may be made of plastic material. The sixth lens 160 may include an eleventh surface S11 defined as an object side surface and a twelfth surface S12 defined as an image side surface. The eleventh surface S11 may be convex in the optical axis OA, and the twelfth surface S12 may be concave in the optical axis OA. That is, the sixth lens 160 may have a meniscus shape that is convex toward the object side in the optical axis OA. Also, the eleventh surface S11 may be convex in the optical axis OA, and the twelfth surface S12 may be convex in the optical axis OA. That is, both sides of the sixth lens 160 may be convex in the optical axis OA. Furthermore, the 11th surface S11 may be convex with respect to the optical axis OA, and the 12th surface S12 may be planar (infinity) with respect to the optical axis OA. Also, the 11th surface S11 may be concave with respect to the optical axis OA, and the 12th surface S12 may be convex with respect to the optical axis OA. That is, the 6th lens 160 may have a meniscus shape that is convex towards the image side with respect to the optical axis OA. At least one of the 11th surface S11 and the 12th surface S12 may be aspherical. For example, both the 11th surface S11 and the 12th surface S12 may be aspherical. At least one of the 11th surface S11 and the 12th surface S12 may include an aspherical surface having a 30th-order aspheric coefficient.

[0037] The seventh lens 170 may have a negative refractive power at the optical axis OA. The seventh lens 170 may be made of plastic or glass material. For example, the seventh lens 170 may be made of plastic material. The seventh lens 170 may include a thirteenth surface S13 defined as an object side surface and a fourteenth surface S14 defined as an image side surface. The thirteenth surface S13 may be concave at the optical axis OA, and the fourteenth surface S14 may be concave at the optical axis OA. That is, both surfaces of the seventh lens 170 may be concave. Also, the thirteenth surface S13 may be concave at the optical axis OA, and the fourteenth surface S14 may be planar (infinity) at the optical axis OA. Also, the thirteenth surface S13 may be concave at the optical axis OA, and the fourteenth surface S14 may be convex at the optical axis OA. That is, the seventh lens 170 may have a meniscus shape that is convex towards the image side along the optical axis OA. At least one of the 13th surface S13 and the 14th surface S14 may be aspherical. For example, both the 13th surface S13 and the 14th surface S14 may be aspherical. At least one of the 13th surface S13 and the 14th surface S14 may include an aspherical surface having a 30th-order aspheric coefficient.

[0038] At least one of the plurality of lenses 100 may include at least one point having a tangent angle set with respect to the direction perpendicular to the optical axis OA. For example, at least one of the fifth lens 150, the sixth lens 160, and the seventh lens 170 may include at least one point having a tangent angle set with respect to the direction perpendicular to the optical axis OA. As an example, the fifth lens 150 may include at least one point located on the ninth surface S9 that has a tangent angle set with respect to the direction perpendicular to the optical axis OA. More specifically, the fifth lens 150 may include a first point P1 where the angle θ1 of the tangent L1 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The first point P1 may be located at a position of about 65% or more of the direction perpendicular to the optical axis OA, with respect to the direction perpendicular to the optical axis OA, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first point P1 may be located at a position approximately 70% or more of the way from the perpendicular direction of the optical axis OA. More specifically, the first point P1 may be located at a position approximately 75% or more of the way from the perpendicular direction of the optical axis OA. Here, the position of the first point P1 can mean the position of a point that is at the shortest distance from the optical axis OA, among points that satisfy the tangent angle of approximately 40 degrees or more with respect to the perpendicular direction of the optical axis OA. That is, the first point P1 may be a point on the side surface of the object that corresponds to an area of ​​approximately 0.65 times or more the shortest distance from the central axis of the fifth lens 150 to the end of the side surface (ninth surface S9) of the fifth lens 150, and the tangent angle at the first point P1 may be approximately 40 degrees or more. That is, when the length from the optical axis OA to the end of the ninth surface S9 is defined as h3, the first point P1 may be located at a position separated from the optical axis OA by a first length h4.

[0039] The fifth lens 150 may include a first-first point (not shown) on the ninth surface S9 where the angle θ1 of the tangent L1 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. The first-first point may be located at a position about 75% or more of the perpendicular direction of the optical axis OA, with respect to the optical axis OA as the starting point and the end of the ninth surface S9 of the fifth lens 150 as the ending point. More specifically, the first-first point may be located at a position about 80% or more of the perpendicular direction of the optical axis OA as the reference point. More specifically, the first-first point may be located at a position about 85% or more of the perpendicular direction of the optical axis OA as the reference point. Here, the position of the first-first point may mean the position of the point that is at the shortest distance from the optical axis OA among the points that satisfy the tangent angle of about 50 degrees or more with respect to the direction perpendicular to the optical axis OA. That is, point 1-1 may be a point on the side surface of the object that corresponds to an area of ​​approximately 0.75 times or more the shortest distance from the central axis of the fifth lens 150 to the end of the side surface of the object (9th surface S9) of the fifth lens 150, and the tangent angle at point 1-1 may be approximately 50 degrees or more. That is, when the length from the optical axis OA to the end of the 9th surface S9 is defined as h3, point 1-1 may be positioned at a distance of a second length from the optical axis OA. In this case, the second length may be longer than the first length h4.

[0040] The fifth lens 150 may have a tangent angle of approximately 40 to 50 degrees on the object side surface (9th surface S9) corresponding to a region approximately 0.65 to 0.75 times the shortest distance from the central axis to the end of the object side surface (9th surface S9) of the fifth lens 150. The fifth lens 150 may include first and second points (not shown) located on the 9th surface S9, where the angle θ1 of the tangent L1 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is approximately 60 degrees or more. The first and second points may be located at a position approximately 80% or more of the perpendicular direction of the optical axis OA, with respect to the optical axis OA as the starting point and the end of the 9th surface S9 of the fifth lens 150 as the ending point. More specifically, the first and second points may be located at a position approximately 85% or more of the perpendicular direction of the optical axis OA as the reference point. More specifically, the first and second points may be positioned at a location approximately 90% or more of the way from the direction perpendicular to the optical axis OA. Here, the location of the first and second points can mean the location of a point that is at the shortest distance from the optical axis OA, among points that satisfy the tangent angle of approximately 60 degrees or more with respect to the direction perpendicular to the optical axis OA. That is, the first and second points may be points on the side surface of the object corresponding to an area of ​​approximately 0.8 times or more the shortest distance from the central axis of the fifth lens 150 to the end of the side surface (ninth surface S9) of the fifth lens 150, and the tangent angle at the first and second points may be 60 degrees or more. That is, if the length from the optical axis OA to the end of the ninth surface S9 is defined as h3, the first and second points may be positioned at a distance of a third length from the optical axis OA. In this case, the third length may be longer than the second length. The fifth lens 150 has a tangent angle of approximately 50 to 60 degrees on the object side surface (9th surface S9) corresponding to a region approximately 0.75 to 0.8 times the shortest distance from the central axis to the end of the object side surface (9th surface S9) of the fifth lens 150.

[0041] The sixth lens 160 may include at least one point on the eleventh surface S11 having a tangent angle set with respect to the direction perpendicular to the optical axis OA. More specifically, the sixth lens 160 may include a second point P2 where the angle θ2 of the tangent L2 to a hypothetical line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The second point P2 may be located at a position about 65% or more of the perpendicular to the optical axis OA, with respect to the optical axis OA as the starting point and the end of the eleventh surface S11 of the sixth lens 160 as the ending point. More specifically, the second point P2 may be located at a position about 70% or more of the perpendicular to the optical axis OA. More specifically, the second point P2 may be located at a position about 75% or more of the perpendicular to the optical axis OA. Here, the position of the second point P2 can mean the position of a point that is at the shortest distance from the optical axis OA, among points where the tangent angle is approximately 40 degrees or more, with respect to the direction perpendicular to the optical axis OA. That is, the second point P2 may be a point on the side surface of the object that corresponds to an area of ​​approximately 0.65 times or more the shortest distance from the central axis of the sixth lens 160 to the end of the side surface (11th surface S11) of the sixth lens 160, and the tangent angle at the second point P2 may be approximately 40 degrees or more. That is, when the length from the optical axis OA to the end of the 11th surface S11 is defined as h5, the second point P2 may be positioned at a distance of a fourth length h6 from the optical axis OA.

[0042] With respect to the optical axis OA, the second point P2 can be located at a greater distance than the first point P1. More specifically, the distance h6 between the optical axis OA and the second point P2 with respect to the direction perpendicular to the optical axis OA may be greater than the distance h4 between the optical axis OA and the first point P1.

[0043] The sixth lens 160 may include a second-first point (not shown) on the eleventh surface S11 where the angle θ2 of the tangent L2 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. The second-first point may be located at a position about 75% or more of the perpendicular direction of the optical axis OA, with respect to the optical axis OA as the starting point and the end of the eleventh surface S11 of the sixth lens 160 as the ending point. More specifically, the second-first point may be located at a position about 80% or more of the perpendicular direction of the optical axis OA as the reference point. More specifically, the second-first point may be located at a position about 85% or more of the perpendicular direction of the optical axis OA as the reference point. Here, the position of the second-first point can mean the position of the point that is at the shortest distance from the optical axis OA among the points that satisfy the tangent angle of about 50 degrees or more with respect to the direction perpendicular to the optical axis OA. That is, point 2-1 may be a point on the side surface of the object that corresponds to an area of ​​approximately 0.75 times or more the shortest distance from the central axis of the sixth lens 160 to the end of the side surface of the object (11th surface S11) of the sixth lens 160, and the tangent angle at point 2-1 may be approximately 50 degrees or more. That is, if the length from the optical axis OA to the end of the 11th surface S11 is defined as h5, point 2-1 may be positioned at a distance of a fifth length from the optical axis OA. In this case, the fifth length may be longer than the fourth length h6. With respect to the optical axis OA, point 2-1 may be located at a greater distance than point 1-1. In particular, with respect to the direction perpendicular to the optical axis OA, the distance between the optical axis OA and point 2-1 may be greater than the distance between the optical axis OA and point 1-1. The sixth lens 160 has a tangent angle of approximately 40 to 50 degrees at the object side surface (11th surface S11) corresponding to a region approximately 0.65 to 0.75 times the shortest distance from the central axis to the end of the object side surface (11th surface S11) of the sixth lens 160.

[0044] The sixth lens 160 may include a second-second point (not shown) on the eleventh surface S11 where the angle θ2 of the tangent L2 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 60 degrees or more. The second-second point may be located at a position about 80% or more of the way from the direction perpendicular to the optical axis OA, with respect to the optical axis OA as the starting point and the end of the eleventh surface S11 of the sixth lens 160 as the ending point. More specifically, the second-second point may be located at a position about 85% or more of the way from the direction perpendicular to the optical axis OA. More specifically, the second-second point may be located at a position about 90% or more of the way from the direction perpendicular to the optical axis OA. Here, the position of the second-second point can mean the position of the point that is at the shortest distance from the optical axis OA among the points that satisfy the tangent angle of about 60 degrees or more with respect to the direction perpendicular to the optical axis OA. That is, point 2-2 may be a point on the side surface of an object corresponding to an area of ​​approximately 0.8 times or more the shortest distance from the central axis of the sixth lens 160 to the end of the side surface (11th surface S11) of the sixth lens 160, and the tangent angle at point 2-2 may be approximately 60 degrees or more. That is, if the length from the optical axis OA to the end of the 11th surface S11 is defined as h5, point 2-2 may be positioned at a distance of a sixth length from the optical axis OA. In this case, the sixth length may be longer than the fifth length. In this case, point 2-2 may be located at a greater distance from the optical axis OA than point 1-2. More specifically, with respect to the direction perpendicular to the optical axis OA, the distance between the optical axis OA and point 2-2 may be greater than the distance between the optical axis OA and point 1-2. The sixth lens 160 may have a tangent angle of approximately 50 to 60 degrees on the object side surface (11th surface S11) corresponding to a region approximately 0.75 to 0.8 times the shortest distance from the central axis to the end of the object side surface (11th surface S11) of the sixth lens 160.

[0045] The image surface (14th surface S14) of the seventh lens 170 may be convex. The seventh lens 170 may include at least one point on the 14th surface S14 that has a tangent angle set with respect to the direction perpendicular to the optical axis OA. More specifically, the seventh lens 170 may include a third point P3 where the angle θ3 of the tangent L3 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The third point P3 may be located at a position about 65% or more of the perpendicular to the optical axis OA, with respect to the optical axis OA as the starting point and the end of the 14th surface S14 of the seventh lens 170 as the ending point. More specifically, the third point P3 may be located at a position about 70% or more of the perpendicular to the optical axis OA. More specifically, the third point P3 may be located at a position about 75% or more of the perpendicular to the optical axis OA. Here, the position of the third point P3 can mean the position of a point that is at the shortest distance from the optical axis OA, among points that satisfy the tangent angle of about 40 degrees or more, with respect to the direction perpendicular to the optical axis OA. That is, the third point P3 may be a point on the image side (14th surface S14) of the 7th lens 170 that corresponds to an area of ​​about 0.65 times or more the shortest distance from the central axis of the 7th lens 170 to the end of the image side (14th surface S14) of the 7th lens 170, and the tangent angle at the third point P3 may be about 40 degrees or more. That is, when the length from the optical axis OA to the end of the 14th surface S14 is defined as h1, the third point P3 may be positioned at a distance of 7 lengths h2 from the optical axis OA. In this case, the third point P3 may be located at a greater distance from the optical axis OA than the second point P2. More specifically, the distance between the optical axis OA and the third point P3 may be greater than the distance between the optical axis OA and the second point P2, with respect to the direction perpendicular to the optical axis OA.

[0046] The seventh lens 170 may include a third-first point (not shown) on the 14th surface S14 where the angle θ3 of the tangent L3 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. The third-first point may be located at a position about 75% or more of the perpendicular direction of the optical axis OA, with respect to the optical axis OA as the starting point and the end of the 14th surface S14 of the seventh lens 170 as the ending point. More specifically, the third-first point may be located at a position about 80% or more of the perpendicular direction of the optical axis OA as the reference point. More specifically, the third-first point may be located at a position about 83% or more of the perpendicular direction of the optical axis OA as the reference point. Here, the position of the third-first point can mean the position of the point that is at the shortest distance from the optical axis OA among the points that satisfy the tangent angle of about 50 degrees or more with respect to the direction perpendicular to the optical axis OA. That is, point 3-1 may be a point on the image side (14th surface S14) of the 7th lens 170 that corresponds to an area of ​​approximately 0.75 times or more the shortest distance from the central axis of the 7th lens 170 to the end of the image side (14th surface S14) of the 7th lens 170, and the tangent angle of point 3-1 may be approximately 50 degrees or more. That is, if the length from the optical axis OA to the end of the 14th surface S14 is defined as h1, point 3-1 may be positioned at a distance of an 8th length from the optical axis OA. In this case, the 8th length may be longer than the 7th length h2. With respect to the optical axis OA, point 3-1 may be located at a greater distance than point 2-1. In particular, with respect to the direction perpendicular to the optical axis OA, the distance between the optical axis OA and point 3-1 may be greater than the distance between the optical axis OA and point 2-1.

[0047] The seventh lens 170 may have a tangent angle of approximately 40 to 50 degrees at the image surface (14th surface S14) corresponding to a region approximately 0.65 to 0.75 times the shortest distance from the central axis to the end of the image surface (14th surface S14) of the seventh lens 170. The seventh lens 170 may include a third-second point (not shown) located on the 14th surface S14, where the angle θ3 of the tangent L3 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is approximately 60 degrees or more. When the optical axis OA is taken as the starting point and the end of the 14th surface S14 of the seventh lens 170 is taken as the ending point, the third-second point may be located at a position approximately 80% or more relative to the direction perpendicular to the optical axis OA. More specifically, the third-second point may be located at a position approximately 85% or more relative to the direction perpendicular to the optical axis OA. More specifically, point 3-2 may be positioned at a location approximately 90% or more of the way from the direction perpendicular to the optical axis OA. Here, the position of point 3-2 can mean the position of a point that is at the shortest distance from the optical axis OA among points that satisfy the tangent angle of approximately 60 degrees or more with respect to the direction perpendicular to the optical axis OA. That is, point 3-2 may be a point on the image side of the 7th lens 170 corresponding to an area of ​​approximately 0.8 times or more the shortest distance from the central axis of the 7th lens 170 to the end of the image side (14th surface S14) of the 7th lens 170, and the tangent angle at point 3-1 may be approximately 60 degrees or more. That is, if the length from the optical axis OA to the end of the 14th surface S14 is defined as h1, point 3-2 may be positioned at a distance of 9 lengths from the optical axis OA. In this case, the 9th length may be longer than the 8th length. More specifically, with respect to the direction perpendicular to the optical axis OA, the distance between the optical axis OA and point 3-2 may be greater than the distance between the optical axis OA and point 2-2.

[0048] The seventh lens 170 has a tangent angle of approximately 50 to 60 degrees at the image surface (14th surface S14) corresponding to a region of approximately 0.75 to 0.8 times the shortest distance from the central axis to the end of the image surface (14th surface S14) of the seventh lens 170. As a result, the optical system 1000 according to the embodiment can effectively correct astigmatism and distortion in the peripheral area. Furthermore, the optical system 1000 according to the embodiment can improve the optical performance in the peripheral area of ​​approximately 65% ​​or more of the maximum field of view (FOV). In addition, in the embodiment, the shape of the peripheral area is significantly curved relative to the aspherical shape of the 14th surface S14, thereby effectively correcting astigmatism and distortion in the peripheral area.

[0049] In the optical system 1000 according to the embodiment, the lens surface of at least one lens included in the lens group may have a 30th-order aspheric coefficient and a greatly curved shape. For example, at least three of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 may have a 30th-order aspheric coefficient. This ensures sufficient optical performance with a thin optical system where the TTL / ImgH is less than 0.65, even if the size of the image sensor 300 is large. Furthermore, since the embodiment includes a 30th-order aspheric surface and allows for free control of the shape of the lens surface, it is possible to create an efficient shape. In addition, it is possible to improve the optical performance not only of the peripheral part of the lens surface but also of the central part.

[0050] The optical system 1000 according to the embodiment can satisfy at least one of the following mathematical formulas. As a result, the optical system 1000 according to the embodiment can have improved optical characteristics. Furthermore, the optical system 1000 according to the embodiment can have a slimmer structure.

[0051] [Mathematics 1] n1d<1.51

[0052] In Equation 1, n1d represents the refractive index of the first lens 110 with respect to the d-line wavelength. For example, if the first lens 110 satisfies the refractive index within the range described above, the curvature of the object side surface of the first lens 110 increases, thereby effectively controlling the aberrations occurring in the peripheral parts of the fifth to seventh lenses 150, 160, and 170. Therefore, the optical system 1000 can have excellent optical properties in its peripheral parts.

[0053] [Math 2] 28<|L1R1| / |f1|<0.41

[0054] In Equation 2, L1R1 represents the radius of curvature of the object side surface (first surface S1) of the first lens 110, and f1 represents the focal length of the first lens 110. More specifically, Equation 2 can satisfy 0.3 < |L1R1| / |f1| < 0.38, taking into account the optical characteristics of the peripheral area. More specifically, Equation 2 can satisfy 0.31 < |L1R1| / |f1| < 0.35. For example, if Equation 2 is less than or equal to the lower limit of 0.28, the radius of curvature of the first surface S1 may be too small, making it difficult to correct spherical aberration. Also, if it is greater than or equal to the upper limit of 0.41, the radius of curvature of the first surface S1 may increase relatively, making it difficult to effectively control the aberrations formed in the peripheral areas of the fifth lens 150, the sixth lens 160, and the seventh lens 170. Therefore, it is preferable that Equation 2 satisfies the above-mentioned range.

[0055] [Math 3] 0.29<|L1R1| / |L1R2|<0.45

[0056] In Equation 3, L1R1 represents the radius of curvature of the object side surface (first surface S1) of the first lens 110, and L1R2 represents the radius of curvature of the image side surface (second surface S2) of the first lens 110. More specifically, Equation 3 can satisfy 0.3 < |L1R1| / |L1R2| < 0.43, taking into account the optical characteristics of the peripheral area. More specifically, Equation 3 can satisfy 0.32 < |L1R1| / |L1R2| < 0.41. For example, if Equation 3 is less than or equal to the lower limit of 0.29, the radius of curvature of the first surface S1 becomes smaller than the radius of curvature of the second surface S2, which can increase spherical aberration. Also, if Equation 3 is greater than or equal to the upper limit of 0.45, the radius of curvature of the first surface S1 becomes larger than the radius of curvature of the second surface S2, which can increase spherical aberration. Therefore, it is preferable that formula 3 satisfies the range described above.

[0057] [Math 4] 0.18 < (d56 + d67) / TD < 0.35

[0058] In Equation 4, d56 represents the distance along the optical axis OA between the image side (10th surface S10) of the 5th lens 150 and the object side (11th surface S11) of the 6th lens 160, and d67 represents the distance along the optical axis OA between the image side (12th surface S12) of the 6th lens 160 and the object side (13th surface S13) of the 7th lens 170. Also, TD represents the distance along the optical axis OA from the vertex of the object side (1st surface S1) of the 1st lens 110 to the vertex of the image side of the lens closest to the image sensor 300. More specifically, Equation 4 can satisfy 0.2 < (d56 + d67) / TD < 0.33, taking into account the optical characteristics of the peripheral area. More specifically, Equation 4 can satisfy 0.22 < (d56 + d67) / TD < 0.3. For example, if Equation 4 for d56, d67, and TD does not satisfy the range described above, the lateral color aberration in the peripheral area may increase, and the optical characteristics may deteriorate. Therefore, it is preferable that Equation 4 satisfies the range described above.

[0059] [Number 5] 1 < CA_L1S1 / CA_L1S2 < 1.2

[0060] In Equation 5, CA_L1S1 represents the size of the clear aperture (CA) of the object side surface (first surface S1) of the first lens 110, and CA_L1S2 represents the size of the clear aperture CA of the image side surface (second surface S2) of the first lens 110. Specifically, Equation 5 can satisfy 1.05 < CA_L1S1 / CA_L1S2 < 1.18 in consideration of the optical characteristics of the peripheral part. More specifically, Equation 5 can satisfy 1.05 < CA_L1S1 / CA_L1S2 < 1.15.

[0061] [Equation 6] 0.35 < CA_L1S1 / CA_L7S2 < 0.5

[0062] In Equation 6, CA_L1S1 represents the size of the clear aperture CA of the object side surface (first surface S1) of the first lens 110, and CA_L7S2 represents the size of the clear aperture CA of the image side surface (14th surface S14) of the seventh lens 170. Specifically, Equation 6 can satisfy 0.38 < CA_L1S1 / CA_L7S2 < 0.5 in consideration of the optical characteristics of the peripheral part. More specifically, Equation 6 can satisfy 0.4 < CA_L1S1 / CA_L7S2 < 0.485.

[0063] [Equation 7] 0.15 < |L1R1| / |L5R1| < 0.5

[0064] In Equation 7, L1R1 represents the radius of curvature of the object side surface (first surface S1) of the first lens 110, and L5R1 represents the radius of curvature of the object side surface (9th surface (S9)) of the fifth lens 150. Specifically, Equation 7 can satisfy 0.2 < |L1R1| / |L5R1| < 0.48 in consideration of the optical characteristics of the peripheral part. More specifically, Equation 7 can satisfy 0.25 < |L1R1| / |L5R1| < 0.48.

[0065] [Equation 8] 3.5 < L1_CT / L2_CT < 5

[0066] In Equation 8, L1_CT means the central thickness on the optical axis OA of the first lens 110, and L2_CT means the central thickness on the optical axis OA of the second lens 120. Specifically, Equation 8 can satisfy 3.8 < L1_CT / L2_CT < 4.9 in consideration of the optical characteristics of the peripheral part and the slimming characteristics of the optical system. More specifically, Equation 8 can satisfy 4 < L1_CT / L2_CT < 4.8.

[0067] [Equation 9] 2 < d56 / L5_CT < 2.5

[0068] In Equation 9, d56 means the distance on the optical axis OA between the image-side surface (the tenth surface S10) of the fifth lens 150 and the object-side surface (the eleventh surface S11) of the sixth lens 160, and L5_CT means the central thickness on the optical axis OA of the fifth lens 150.

[0069] [Equation 10] 0.6 < d56 / L6_CT < 1.2

[0070] In Equation 10, d56 means the distance on the optical axis OA between the image-side surface (the tenth surface S10) of the fifth lens 150 and the object-side surface (the eleventh surface S11) of the sixth lens 160, and L6_CT means the central thickness on the optical axis OA of the sixth lens 160.

[0071] [Equation 11] 1.5 < d67 / L6_CT < 2.4

[0072] In Equation 11, d67 means the distance on the optical axis OA between the image-side surface (the twelfth surface S12) of the sixth lens 160 and the object-side surface (the thirteenth surface S13) of the seventh lens 170, and L6_CT means the central thickness on the optical axis OA of the sixth lens 160.

[0073] [Equation 12] 2 < d67 / L7_CT < 3.5

[0074] In Equation 12, d67 means the distance on the optical axis OA between the image-side surface (the 12th surface S12) of the sixth lens 160 and the object-side surface (the 13th surface S13) of the seventh lens 170, and L7_CT means the center thickness on the optical axis OA of the seventh lens 170.

[0075] [Equation 13] 3.5 < CA_L1S1 / L1_CT < 4.5

[0076] In Equation 13, CA_L1S1 means the size of the effective diameter CA of the object-side surface (the first surface S1) of the first lens 110, and L1_CT means the center thickness on the optical axis OA of the first lens 110. Specifically, Equation 13 can satisfy 3.6 < CA_L1S1 / L1_CT < 4.3 in consideration of the optical characteristics of the peripheral part and the slimming characteristics of the optical system. More specifically, Equation 13 can satisfy 3.75 < CA_L1S1 / L1_CT < 4.25.

[0077] [Equation 14] 12.5 < CA_L5S1 / L5_CT < 16.5

[0078] In Equation 14, CA_L5S1 means the size of the effective diameter CA of the object-side surface (the ninth surface S9) of the fifth lens 150, and L5_CT means the center thickness on the optical axis OA of the fifth lens 150. Specifically, Equation 14 can satisfy 13 < CA_L5S1 / L5_CT < 16 in consideration of the optical characteristics of the peripheral part and the slimming characteristics. More specifically, Equation 14 can satisfy 14 < CA_L5S1 / L5_CT < 15.5.

[0079] [Equation 15] 5 < CA_L6S1 / L6_CT < 10

[0080] In equation 15, CA_L6S1 represents the size of the effective diameter CA of the object side surface (11th surface S11) of the sixth lens 160, and L6_CT represents the central thickness of the sixth lens 160 at the optical axis OA.

[0081] [Number 16] 15 <CA_L7S2 / L7_CT<23

[0082] In equation 16, CA_L7S2 represents the size of the effective diameter CA of the image side (14th surface S14) of the 7th lens 170, and L7_CT represents the central thickness of the 7th lens 170 in the optical axis OA.

[0083] [Number 17] 0.9 <f1 / F<1.1

[0084] In equation 17, f1 represents the focal length of the first lens 110, and F represents the total focal length of the optical system 1000.

[0085] [Number 18] -2 <f1 / f7-0.5

[0086] In equation 18, f1 represents the focal length of the first lens 110, and f7 represents the focal length of the seventh lens 170.

[0087] [Number 19] 0.6 <CA_Smax / ImgH<1

[0088] In equation 19, CA_Smax represents the size of the largest effective diameter CA among the lens surfaces of the multiple lenses 100 included in the optical system 1000, and ImgH represents twice the perpendicular distance of the optical axis OA from the center 0-field region of the image plane of the image sensor 300 that coincides with the optical axis OA to the 1.0-field region of the image sensor 300. That is, ImgH represents the total diagonal length of the effective area of ​​the image sensor 300.

[0089] [Number 20] 0.5 <TTL / ImgH<0.65

[0090] In equation 20, TTL (Total track length) means the distance along the optical axis OA from the vertex of the object side surface (first surface S1) of the first lens 110 to the image plane of the image sensor 300, and ImgH means twice the perpendicular distance along the optical axis OA from the center 0 field (fielded) region of the image plane of the image sensor 300 that coincides with the optical axis OA to the 1.0 field (fielded) region of the image sensor 300. That is, ImgH means the total diagonal length of the effective area of ​​the image sensor 300.

[0091] [Number 21] 0.02 <BFL / ImgH<0.1

[0092] In equation 21, BFL (Back focal length) means the distance along the optical axis OA from the vertex of the image side of the lens closest to the image sensor 300 to the image plane of the image sensor 300, and ImgH means twice the perpendicular distance along the optical axis OA from the center 0 field (fielded) region of the image plane of the image sensor 300 that coincides with the optical axis OA to the 1.0 field (fielded) region of the image sensor 300. That is, ImgH means the total diagonal length of the effective area of ​​the image sensor 300.

[0093] [Number 22] 0.25 <TD / ImgH<0.75

[0094] In equation 22, TD represents the distance along the optical axis OA from the vertex of the object side surface (first surface S1) of the first lens 110 to the vertex of the image side surface of the lens closest to the image sensor 300, and ImgH represents twice the perpendicular distance along the optical axis OA from the center 0-field region of the image plane of the image sensor 300 that coincides with the optical axis OA to the 1.0-field region of the image sensor 300. That is, ImgH represents the total diagonal length of the effective area of ​​the image sensor 300.

[0095] [Number 23] 7.5 <TTL / BFL<11F

[0096] In equation 23, TTL (Total track length) means the distance along the optical axis OA from the vertex of the object side surface (first surface S1) of the first lens 110 to the image plane of the image sensor 300, and BFL (Back focal length) means the distance along the optical axis OA from the vertex of the image side surface of the lens closest to the image sensor 300 to the image plane of the image sensor 300.

[0097] [Number 24] 0.8 <F / TTL<1

[0098] In equation 24, F represents the total focal length of the optical system 1000, and TTL (Total track length) represents the distance along the optical axis OA from the vertex of the object side surface (first surface S1) of the first lens 110 to the image plane of the image sensor 300.

[0099] [Number 25] 7 <F / BFL<10

[0100] In equation 25, F represents the total focal length of the optical system 1000, and BFL (Back focal length) represents the distance along the optical axis OA from the vertex of the image side of the lens closest to the image sensor 300 to the image plane of the image sensor 300.

[0101] [Number 26] 0.3 <F / ImgH<0.7

[0102] In equation 26, F represents the total focal length of the optical system 1000, and ImgH represents twice the perpendicular distance of the optical axis OA from the 0-field region at the center of the image plane of the image sensor 300, which coincides with the optical axis OA, to the 1.0-field region of the image sensor 300. That is, ImgH represents the total diagonal length of the effective region of the image sensor 300. [Number 27]

[0103]

number

[0104] In equation 32, Z can represent the distance in the optical axis direction from any position on the aspherical surface to the vertex of the aspherical surface, as indicated by Sag. Y can represent the distance 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. A4, A6, A8, ..., A30 can represent the 4th to 30th order aspheric constants. Furthermore, in the case of other rotationally symmetric aspherical equations, when y is the distance from the optical axis (y=0), in the aspherical expansion equation, y 22 , y 24 , y 26 , y 28 , y 30The coefficients in the terms are defined as 30th-order aspheric coefficients. For example, for SPS QCN aspheric surfaces provided by the commercially available optical design tool "CODEV", QC22, QC24, QC26, QC28, and QC30 are 30th-order aspheric coefficients. Similarly, for SPS QBF aspheric surfaces (provided by CODEV), QB22, QB24, QB26, QB28, and QB30 are 30th-order aspheric coefficients. Furthermore, for SPS ODD aspheric surfaces (odd-order aspheric surfaces provided by CODEV), AR22, AR24, AR26, AR28, and AR30 are 30th-order aspheric coefficients. Aspheric surfaces with these 30th-order aspheric coefficients (values ​​other than "0") can significantly alter the aspheric shape at the periphery, thus effectively correcting the optical performance at the periphery.

[0105] The optical system 1000 according to the embodiment can satisfy at least one of the equations 1 to 26. In this case, the optical system 1000 can have improved optical characteristics. Specifically, if the optical system 1000 satisfies at least one of the equations 1 to 26, the optical system 1000 can improve the resolution in the peripheral area (an area of ​​approximately 65% ​​or more of the field of view), and can improve distortion and aberration characteristics. Furthermore, if the optical system 1000 satisfies at least one of the equations 1 to 26, the optical system 1000 can have a slimmer structure, thereby enabling the provision of a camera module and mobile terminal device including the optical system 1000 in a slimmer and more compact form.

[0106] In the optical system 1000 according to the embodiment, at least one of the multiple lenses 100 may include an aspherical surface having a 30th-order aspherical coefficient. For example, at least one lens surface among the object side and image side of the 5th to 7th lenses 150, 160, and 170 may include an aspherical surface having a 30th-order aspherical coefficient. Specifically, at least one lens surface among the 9th surface S9 of the 5th lens 150, the 11th surface S11 of the 6th lens 160, and the 14th surface S14 of the 7th lens 170 may include an aspherical surface having a 30th-order aspherical coefficient. As a result, the optical system 1000 can effectively correct aberration characteristics in the peripheral area and improve the optical performance in the peripheral area. In the optical system 1000 according to the embodiment, at least one lens surface may include a point on the aspherical surface that satisfies a tangent angle of 40 degrees or more. In this case, the point may be located at a distance of approximately 65% ​​or more from the optical axis OA, with the optical axis OA as the starting point and the end of the lens surface as the ending point. As a result, the optical system 1000 can effectively correct astigmatism and distortion in an area of ​​approximately 65% ​​or more of the maximum field of view (FOV). In the optical system 1000 according to the embodiment, at least one lens surface can include a point on the aspherical surface that satisfies a tangent angle of 50 degrees or more. In this case, the point can be located at a distance of approximately 75% or more from the optical axis OA, with the optical axis OA as the starting point and the end point of the lens surface as the ending point. As a result, the optical system 1000 can effectively correct astigmatism and distortion in an area of ​​approximately 75% or more of the maximum field of view (FOV). In the optical system 1000 according to the embodiment, the third lens 130 can have a positive refractive power and a meniscus shape that is convex toward the object side. As a result, the optical system 1000 can have a slim structure and embody improved optical performance.

[0107] The optical system 1000 according to the first embodiment will be described in more detail with reference to Figures 1 to 5. Figure 1 is a configuration diagram of the optical system according to the first embodiment, and Figures 2 to 4 are diagrams illustrating the tangent angles at arbitrary points in the optical system according to the first embodiment. Figure 5 is a graph showing the aberration characteristics of the optical system according to the first embodiment.

[0108] Referring to Figures 1 to 5, the optical system 1000 according to the first embodiment may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an image sensor 300, which are arranged sequentially from the object side to the image side. The first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 may be arranged sequentially along the optical axis OA of the optical system 1000.

[0109] In the optical system 1000 according to the first embodiment, the object side surface (third surface S3) of the second lens 120 can function as an aperture. A filter 500 may be placed between the plurality of lenses 100 and the image sensor 300. More specifically, the filter 500 may be placed between the seventh lens 170 and the image sensor 300.

[0110] [Table 1]

[0111] Table 1 shows the radius of curvature, thickness (mm) of each lens in the optical axis OA, thickness (mm) between each lens in the optical axis OA, refractive index (Refractive index) in the d-line, Abbe's number, and clear aperture (mm) of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 according to the first embodiment. Referring to Figures 1 and 2 and Table 1, the first lens 110 of the optical system 1000 according to the first embodiment can have a positive refractive power in the optical axis OA. In the optical axis OA, the first surface S1 of the first lens 110 may be convex, and the second surface S2 may be concave. The first lens 110 can have a meniscus shape that is convex toward the object side in the optical axis OA. The first surface S1 may be an aspherical surface, and the second surface S2 may be an aspherical surface. At least one of the first surface S1 and the second surface S2 may include an aspherical surface having a 30th-order aspherical coefficient. More specifically, the first surface S1 and the second surface S2 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the first surface S1 and the second surface S2 may have aspherical coefficients as shown in Table 2. In this case, A4 to A30 in Table 2 represent aspherical coefficients from the 4th to the 30th order.

[0112] The second lens 120 may have a negative refractive power in the optical axis OA. In the optical axis OA, the third surface S3 of the second lens 120 may be convex, and the fourth surface S4 may be concave. The second lens 120 may have a meniscus shape that is convex toward the object in the optical axis OA. The third surface S3 may be aspherical, and the fourth surface S4 may be aspherical. At least one of the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the third surface S3 and the fourth surface S4 may have aspherical coefficients as shown in Table 2. In this case, A4 to A30 in Table 2 represent aspherical coefficients from the 4th to the 30th order.

[0113] The third lens 130 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the fifth surface S5 of the third lens 130 may be convex, and the sixth surface S6 may be concave. The third lens 130 may have a meniscus shape that is convex toward the object in the optical axis OA. The fifth surface S5 may be aspherical, and the sixth surface S6 may be aspherical. At least one of the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the fifth surface S5 and the sixth surface S6 may have aspherical coefficients as shown in Table 2. In this case, A4 to A30 in Table 2 represent aspherical coefficients from the 4th to the 30th order.

[0114] The fourth lens 140 may have a negative refractive power in the optical axis OA. In the optical axis OA, the seventh surface S7 of the fourth lens 140 may be concave, and the eighth surface S8 may be convex. The fourth lens 140 may have a meniscus shape that is convex towards the image side in the optical axis OA. The seventh surface S7 may be aspherical, and the eighth surface S8 may be aspherical. At least one of the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the seventh surface S7 and the eighth surface S8 may have aspherical coefficients as shown in Table 2. In this case, A4 to A30 in Table 2 represent aspherical coefficients from the 4th to the 30th order.

[0115] The fifth lens 150 may have a negative refractive power in the optical axis OA. In the optical axis OA, the ninth surface S9 of the fifth lens 150 may be convex, and the tenth surface S10 may be concave. The fifth lens 150 may have a meniscus shape that is convex toward the object in the optical axis OA. The ninth surface S9 may be aspherical, and the tenth surface S10 may be aspherical. At least one of the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the ninth surface S9 and the tenth surface S10 may have aspherical coefficients as shown in Table 2. In this case, A4 to A30 in Table 2 represent aspherical coefficients from the 4th to the 30th order.

[0116] The sixth lens 160 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the eleventh surface S11 of the sixth lens 160 may be convex, and the twelfth surface S12 may also be convex. Both surfaces of the sixth lens 160 may be convex in the optical axis OA. The eleventh surface S11 may be aspherical, and the twelfth surface S12 may also be aspherical. At least one of the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. More specifically, the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the eleventh surface S11 and the twelfth surface S12 may have aspherical coefficients as shown in Table 2. In this case, A4 to A30 in Table 2 represent aspherical coefficients from the 4th to the 30th order.

[0117] The seventh lens 170 may have a negative refractive power in the optical axis OA. In the optical axis OA, the thirteenth surface S13 of the seventh lens 170 may be concave, and the fourteenth surface S14 may also be concave. Both surfaces of the seventh lens 170 may be concave in the optical axis OA. The thirteenth surface S13 may be aspherical, and the fourteenth surface S14 may also be aspherical. At least one of the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. More specifically, the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the thirteenth surface S13 and the fourteenth surface S14 may have aspherical coefficients as shown in Table 2. In this case, A4 to A30 in Table 2 represent aspherical coefficients from the 4th to the 30th order.

[0118] The values ​​of the aspherical coefficients for each lens surface in the optical system 1000 according to the first embodiment are as shown in Table 2 below.

[0119] [Table 2] TIFF0007873242000004.tif123170

[0120] Furthermore, in the optical system 1000 according to the first embodiment, at least one of the fifth lens 150, the sixth lens 160, and the seventh lens 170 may have a tangent angle set to improve the optical characteristics of light incident on the peripheral area (an area of ​​approximately 65% ​​or more of the field of view).

[0121] [Table 3]

[0122] More specifically, Table 3 shows the tangent angles with respect to the imaginary line L0 at any position of the ninth surface S9 of the fifth lens 150, the eleventh surface S11 of the sixth lens 160, and the fourteenth surface S14 of the seventh lens 170 according to the first embodiment. Referring to Table 3 and Figures 2 to 4, the fifth lens 150 may include the first point P1 in which the tangent angle L1 with respect to the imaginary line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The first point P1 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.5015 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first point P1 can be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.7325 mm or more. The fifth lens 150 may include a first-first point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. The first-first point can be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.7325 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first-first point may be located at a position of about 85% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.9635 mm or more. The fifth lens 150 may include a first-second point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 60 degrees or more. The first and second points can be located at a position of approximately 80% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 1.856 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first and second points can be located at a position of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 2.079 mm or more.

[0123] The sixth lens 160 may include a second point P2 where the angle of the tangent L2 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The second point P2 can be located at a position of about 65% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.8655 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, the second point P2 may be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 2.1525 mm or more. The sixth lens 160 may include a second-first point (not shown) located on the 11th surface S11 where the angle of the tangent L2 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 2-1 can be located at a position of approximately 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.1525 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, point 2-1 can be located at a position of approximately 85% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.4395 mm or more. The sixth lens 160 may include point 2-2 (not shown) located on the 11th surface S11, where the angle of the tangent L2 to a virtual line L0 extending in the perpendicular direction of the optical axis OA is approximately 60 degrees or more. Point 2-2 can be located at a position of approximately 80% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.296 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, the 2-2 point may be positioned at a location of approximately 90% or more of the perpendicular direction of the optical axis OA, for example, at a location of approximately 2.583 mm or more.

[0124] The seventh lens 170 may include a third point P3 where the angle of the tangent L3 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The third point P3 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.2435 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the seventh lens 170 is the ending point. More specifically, the third point P3 may be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.7425 mm or more. The seventh lens 170 may include a third-first point (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 3-1 can be located at a position of approximately 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.7425 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. More specifically, point 3-1 can be located at a position of approximately 83% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 4.1417 mm or more. The 7th lens 170 may include a point 3-2 (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the perpendicular direction of the optical axis OA is approximately 60 degrees or more. Point 3-2 can be located at a position of approximately 80% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.992 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. In detail, point 3-2 may be positioned at a location of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a location of approximately 4.491 mm or more.

[0125] [Table 4]

[0126] [Table 5]

[0127] Table 4 relates to the items of the formulas described above in the optical system 1000 according to the first embodiment, and concerns the TTL (Total track length), TD, BFL (Back focal length), F-number, ImgH, and the focal lengths f1, f2, f3, f4, f5, f6, f7 of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170, respectively. Table 5 concerns the result values ​​related to formulas 1 to 26 described above in the optical system 1000 according to the first embodiment. Referring to Table 5, it can be seen that the optical system 1000 according to the first embodiment satisfies at least one of formulas 1 to 26. In detail, it can be seen that the optical system 1000 according to the first embodiment satisfies all of formulas 1 to 26. As a result, the optical system 1000 according to the first embodiment can be provided with a slimmer structure. Furthermore, the optical system 1000 has improved optical characteristics and can have aberration characteristics as shown in Figure 5. Specifically, Figure 5 is a graph of the aberration characteristics of the optical system 1000 according to the first embodiment, and is a graph in which spherical aberration (Longitudinal Spherical Aberration), astigmatic field curves, and distortion aberration are measured from left to right. In Figure 5, the X axis can represent focal length (mm) and distortion (%), and the Y axis can represent the height of the image from the center of the image. The graph for spherical aberration is for light in the wavelength bands of 436 nm, 486 nm, 546 nm, 588 nm (d-line), and 656 nm, and the graphs for astigmatic aberration and distortion aberration are for light in the wavelength band of 588 nm. Specifically, referring to Figure 5, the optical system 1000 according to the first embodiment can have improved resolution by having a shape, central thickness, spacing along the optical axis OA, focal length, etc., in which multiple lenses are set.

[0128] The optical system 1000 can have a significantly curved shape in the peripheral portion of at least one of the lens surfaces: the ninth surface S9 of the fifth lens 150, the eleventh surface S11 of the sixth lens 160, and the fourteenth surface S14 of the seventh lens 170. This results in a relatively large tangent angle in the curved region of the lens surface, effectively correcting astigmatism and distortion in the peripheral portion (an area of ​​approximately 65% ​​or more of the field of view). Therefore, the optical system 1000 according to the first embodiment can have improved optical characteristics by effectively correcting aberrations in the peripheral portion (an area of ​​approximately 65% ​​or more of the field of view).

[0129] The optical system 1000 according to the second embodiment will be described in more detail with reference to Figures 6 and 7. In the explanation using Figures 6 and 7, the explanation of the same or similar components as those described above will be omitted, and the same reference numerals will be assigned to the same or similar components. Figure 6 is a configuration diagram of the optical system according to the second embodiment, and Figure 7 is a graph showing the aberration characteristics of the optical system according to the second embodiment.

[0130] Referring to Figures 6 and 7, the optical system 1000 according to the second embodiment may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an image sensor 300, which are arranged sequentially from the object side to the image side. The first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 may be arranged sequentially along the optical axis OA of the optical system 1000.

[0131] Furthermore, in the optical system 1000 according to the second embodiment, the object side surface (third surface S3) of the second lens 120 can function as an aperture. In addition, a filter 500 may be placed between the plurality of lenses 100 and the image sensor 300. More specifically, the filter 500 may be placed between the seventh lens 170 and the image sensor 300.

[0132] [Table 6]

[0133] Table 6 shows the radius of curvature, thickness of each lens in the optical axis OA, distance between each lens in the optical axis OA, refractive index in the d-line, Abbe's number, and size of the clear aperture CA of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 according to the second embodiment. Referring to Figure 6 and Table 6, the first lens 110 of the optical system 1000 according to the second embodiment can have a positive refractive power in the optical axis OA. In the optical axis OA, the first surface S1 of the first lens 110 may be convex, and the second surface S2 may be concave. The first lens 110 may have a meniscus shape that is convex toward the object side in the optical axis OA. The first surface S1 may be aspherical, and the second surface S2 may be aspherical. At least one of the first surface S1 and the second surface S2 may include an aspheric surface having a 30th-order aspheric coefficient. More specifically, the first surface S1 and the second surface S2 may include an aspheric surface having a 30th-order aspheric coefficient. For example, the first surface S1 and the second surface S2 may have aspheric coefficients as shown in Table 7. In this case, A4 to A30 in Table 7 represent aspheric coefficients from the 4th to the 30th order.

[0134] The second lens 120 may have a negative refractive power in the optical axis OA. In the optical axis OA, the third surface S3 of the second lens 120 may be convex, and the fourth surface S4 may be concave. The second lens 120 may have a meniscus shape that is convex toward the object in the optical axis OA. The third surface S3 may be aspherical, and the fourth surface S4 may be aspherical. At least one of the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the third surface S3 and the fourth surface S4 may have aspherical coefficients as shown in Table 7. In this case, A4 to A30 in Table 7 represent aspherical coefficients from the 4th to the 30th order.

[0135] The third lens 130 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the fifth surface S5 of the third lens 130 may be convex, and the sixth surface S6 may be concave. The third lens 130 may have a meniscus shape that is convex toward the object in the optical axis OA. The fifth surface S5 may be aspherical, and the sixth surface S6 may be aspherical. At least one of the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the fifth surface S5 and the sixth surface S6 may have aspherical coefficients as shown in Table 7. In this case, A4 to A30 in Table 7 represent aspherical coefficients from the 4th to the 30th order.

[0136] The fourth lens 140 may have a negative refractive power in the optical axis OA. In the optical axis OA, the seventh surface S7 of the fourth lens 140 may be concave, and the eighth surface S8 may be convex. The fourth lens 140 may have a meniscus shape that is convex towards the image side in the optical axis OA. The seventh surface S7 may be aspherical, and the eighth surface S8 may be aspherical. At least one of the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the seventh surface S7 and the eighth surface S8 may have aspherical coefficients as shown in Table 7. In this case, A4 to A30 in Table 7 represent aspherical coefficients from the 4th to the 30th order.

[0137] The fifth lens 150 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the ninth surface S9 of the fifth lens 150 may be convex, and the tenth surface S10 may be concave. The fifth lens 150 may have a meniscus shape that is convex toward the object in the optical axis OA. The ninth surface S9 may be aspherical, and the tenth surface S10 may be aspherical. At least one of the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the ninth surface S9 and the tenth surface S10 may have aspherical coefficients as shown in Table 7. In this case, A4 to A30 in Table 7 represent aspherical coefficients from the 4th to the 30th order.

[0138] The sixth lens 160 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the eleventh surface S11 of the sixth lens 160 may be concave, and the twelfth surface S12 may be convex. The sixth lens 160 may have a meniscus shape that is convex towards the image side in the optical axis OA. The eleventh surface S11 may be aspherical, and the twelfth surface S12 may be aspherical. At least one of the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the eleventh surface S11 and the twelfth surface S12 may have aspherical coefficients as shown in Table 7. In this case, A4 to A30 in Table 7 represent aspherical coefficients from the 4th to the 30th order.

[0139] The seventh lens 170 may have a negative refractive power in the optical axis OA. In the optical axis OA, the thirteenth surface S13 of the seventh lens 170 may be concave, and the fourteenth surface S14 may also be concave. Both surfaces of the seventh lens 170 may be concave in the optical axis OA. The thirteenth surface S13 may be aspherical, and the fourteenth surface S14 may also be aspherical. At least one of the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. More specifically, the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the thirteenth surface S13 and the fourteenth surface S14 may have aspherical coefficients as shown in Table 7. In this case, A4 to A30 in Table 7 represent aspherical coefficients from the 4th to the 30th order.

[0140] The values ​​of the aspherical coefficients for each lens surface in the optical system 1000 according to the second embodiment are as shown in Table 7 below.

[0141] [Table 7] TIFF0007873242000010.tif87170

[0142] Furthermore, in the optical system 1000 according to the second embodiment, at least one of the fifth lens 150, the sixth lens 160, and the seventh lens 170 may have a tangent angle set to improve the optical characteristics of light incident on an area of ​​approximately 65% ​​or more of the peripheral portion (field of view).

[0143] [Table 8]

[0144] More specifically, Table 8 shows the tangent angles with respect to the imaginary line L0 at any position of the ninth surface S9 of the fifth lens 150, the eleventh surface S11 of the sixth lens 160, and the fourteenth surface S14 of the seventh lens 170 according to the second embodiment. Referring to Table 8 and Figures 2 to 4 above, the fifth lens 150 may include the first point P1 where the tangent angle L1 with respect to the imaginary line LO extending in the direction perpendicular to the optical axis OA is about 40 or more. The first point P1 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.4625 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first point P1 can be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.6875 mm or more. The fifth lens 150 may include a first-first point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. The first-first point can be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.6875 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first-first point may be located at a position of about 85% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.9125 mm or more. The fifth lens 150 may include a first-second point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 60 degrees or more. The first and second points can be located at a position of approximately 80% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 1.8 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first and second points can be located at a position of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 2.025 mm or more.

[0145] The sixth lens 160 may include a second point P2 where the angle of the tangent L2 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The second point P2 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.794 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, the second point P2 may be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 2.07 mm or more. The sixth lens 160 may include a second-first point (not shown) located on the 11th surface S11 where the angle of the tangent L2 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 2-1 can be located at a position of approximately 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.07 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, point 2-1 can be located at a position of approximately 85% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.346 mm or more. The sixth lens 160 may include point 2-2 (not shown) located on the 11th surface S11, where the angle of the tangent L2 to a virtual line L0 extending in the perpendicular direction of the optical axis OA is approximately 60 degrees or more. Point 2-2 can be located at a position of approximately 80% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.208 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, the 2-2 point may be positioned at a location of approximately 90% or more of the perpendicular direction of the optical axis OA, for example, at a location of approximately 2.484 mm or more.

[0146] The seventh lens 170 may include a third point P3 where the angle of the tangent L3 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The third point P3 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.237 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the seventh lens 170 is the ending point. More specifically, the third point P3 may be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.735 mm or more. The seventh lens 170 may include a third-first point (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 3-1 can be located at a position of approximately 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.735 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. More specifically, point 3-1 can be located at a position of approximately 83% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 4.1334 mm or more. The 7th lens 170 may include a point 3-2 (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the perpendicular direction of the optical axis OA is approximately 60 degrees or more. Point 3-2 can be located at a position of approximately 80% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.984 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. More specifically, point 3-2 may be positioned at a location of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a location of approximately 4.482 mm or more.

[0147] [Table 9]

[0148] [Table 10]

[0149] Table 9 relates to the items in the formulas described above for the optical system 1000 according to the second embodiment, and concerns the TTL (Total track length), TD, BFL (Back focal length), F-number, ImgH, and the focal lengths f1, f2, f3, f4, f5, f6, f7 of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170, respectively. Table 10 relates to the result values ​​of formulas 1 to 26 described above for the optical system 1000 according to the second embodiment. Referring to Table 10, it can be seen that the optical system 1000 according to the second embodiment satisfies at least one of formulas 1 to 26. In detail, it can be seen that the optical system 1000 according to the second embodiment satisfies all of formulas 1 to 26. As a result, the optical system 1000 according to the second embodiment can be provided with a slimmer structure. Furthermore, the optical system 1000 has improved optical characteristics and can have aberration characteristics as shown in Figure 7. Specifically, Figure 7 is a graph of the aberration characteristics of the optical system 1000 according to the second embodiment, and is a graph in which spherical aberration (Longitudinal Spherical Aberration), astigmatic field curves, and distortion aberration are measured from left to right. In Figure 7, the X axis can represent focal length (mm) and distortion (%), and the Y axis can represent the height of the image from the center of the image. The graph for spherical aberration is for light in the wavelength bands of 436 nm, 486 nm, 546 nm, 588 nm (d-line), and 656 nm, and the graphs for astigmatic aberration and distortion aberration are for light in the wavelength band of 588 nm. That is, referring to Figure 7, the optical system 1000 according to the second embodiment can have improved resolution by having a set shape, central thickness, spacing in the optical axis OA, focal length, etc., of the multiple lenses. The optical system 1000 can have a greatly curved shape at the peripheral portion of at least one lens surface, such as the 9th surface S9 of the 5th lens 150, the 11th surface S11 of the 6th lens 160, and the 14th surface S14 of the 7th lens 170.As a result, the curved region of the lens surface has a relatively large tangent angle, and astigmatism and distortion in the peripheral area (the area of ​​approximately 65% ​​or more of the field of view FOV) can be effectively corrected. Therefore, the optical system 1000 according to the first embodiment can have improved optical characteristics by effectively correcting aberrations in the peripheral area (the area of ​​approximately 65% ​​or more of the field of view FOV).

[0150] The optical system 1000 according to the third embodiment will be described in more detail with reference to Figures 8 and 9. In the explanation using Figures 8 and 9, the same components as those described above will not be explained, and the same or similar components will be given the same reference numerals. Figure 8 is a diagram of the configuration of the optical system according to the third embodiment, and Figure 9 is a graph showing the aberration characteristics of the optical system according to the third embodiment.

[0151] Referring to Figures 8 and 9, the optical system 1000 according to the third embodiment may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an image sensor 300, which are arranged sequentially from the object side to the image side. The first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 may be arranged sequentially along the optical axis OA of the optical system 1000.

[0152] The optical system 1000 according to the third embodiment may include an aperture (not shown). The aperture may be positioned in front of the first lens 110. A filter 500 may be positioned between the plurality of lenses 100 and the image sensor 300. In particular, the filter 500 may be positioned between the seventh lens 170 and the image sensor 300.

[0153] [Table 11]

[0154] Table 11 shows the radius of curvature, thickness of each lens in the optical axis OA, distance between each lens in the optical axis OA, refractive index in the d-line, Abbe's number, and size of the clear aperture CA of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 according to the third embodiment. Referring to Figure 8 and Table 11, the first lens 110 of the optical system 1000 according to the third embodiment can have a positive refractive power in the optical axis OA. In the optical axis OA, the first surface S1 of the first lens 110 may be convex, and the second surface S2 may be concave. The first lens 110 may have a meniscus shape that is convex toward the object side in the optical axis OA. The first surface S1 may be aspherical, and the second surface S2 may be aspherical. At least one of the first surface S1 and the second surface S2 may include an aspheric surface having a 30th-order aspheric coefficient. More specifically, the first surface S1 and the second surface S2 may include an aspheric surface having a 30th-order aspheric coefficient. For example, the first surface S1 and the second surface S2 may have aspheric coefficients as shown in Table 12. In this case, A4 to A30 in Table 12 represent aspheric coefficients from the 4th to the 30th order.

[0155] The second lens 120 may have a negative refractive power in the optical axis OA. In the optical axis OA, the third surface S3 of the second lens 120 may be convex, and the fourth surface S4 may be concave. The second lens 120 may have a meniscus shape that is convex toward the object in the optical axis OA. The third surface S3 may be aspherical, and the fourth surface S4 may be aspherical. At least one of the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the third surface S3 and the fourth surface S4 may have aspherical coefficients as shown in Table 12. In this case, A4 to A30 in Table 12 represent aspherical coefficients from the 4th to the 30th order.

[0156] The third lens 130 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the fifth surface S5 of the third lens 130 may be convex, and the sixth surface S6 may be concave. The third lens 130 may have a meniscus shape that is convex toward the object in the optical axis OA. The fifth surface S5 may be aspherical, and the sixth surface S6 may be aspherical. At least one of the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the fifth surface S5 and the sixth surface S6 may have aspherical coefficients as shown in Table 12. In this case, A4 to A30 in Table 12 represent aspherical coefficients from the 4th to the 30th order.

[0157] The fourth lens 140 may have a negative refractive power in the optical axis OA. In the optical axis OA, the seventh surface S7 of the fourth lens 140 may be concave, and the eighth surface S8 may be convex. The fourth lens 140 may have a meniscus shape that is convex towards the image side in the optical axis OA. The seventh surface S7 may be aspherical, and the eighth surface S8 may be aspherical. At least one of the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the seventh surface S7 and the eighth surface S8 may have aspherical coefficients as shown in Table 12. In this case, A4 to A30 in Table 12 represent aspherical coefficients from the 4th to the 30th order.

[0158] The fifth lens 150 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the ninth surface S9 of the fifth lens 150 may be convex, and the tenth surface S10 may be concave. The fifth lens 150 may have a meniscus shape that is convex toward the object in the optical axis OA. The ninth surface S9 may be aspherical, and the tenth surface S10 may be aspherical. At least one of the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the ninth surface S9 and the tenth surface S10 may have aspherical coefficients as shown in Table 12. In this case, A4 to A30 in Table 12 represent aspherical coefficients from the 4th to the 30th order.

[0159] The sixth lens 160 can have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the eleventh surface S11 of the sixth lens 160 may be concave, and the twelfth surface S12 may be convex. Both surfaces of the sixth lens 160 can be convex in the optical axis OA. The eleventh surface S11 may be aspherical, and the twelfth surface S12 may be aspherical. At least one of the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the eleventh surface S11 and the twelfth surface S12 may have aspherical coefficients as shown in Table 12. In this case, A4 to A30 in Table 12 represent aspherical coefficients from the 4th to the 30th order.

[0160] The seventh lens 170 may have a negative refractive power in the optical axis OA. In the optical axis OA, the thirteenth surface S13 of the seventh lens 170 may be concave, and the fourteenth surface S14 may also be concave. Both surfaces of the seventh lens 170 may be concave in the optical axis OA. The thirteenth surface S13 may be aspherical, and the fourteenth surface S14 may also be aspherical. At least one of the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. More specifically, the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the thirteenth surface S13 and the fourteenth surface S14 may have aspherical coefficients as shown in Table 12. In this case, A4 to A30 in Table 12 represent aspherical coefficients from the 4th to the 30th order.

[0161] The values ​​of the aspherical coefficients for each lens surface in the optical system 1000 according to the third embodiment are as shown in Table 12 below.

[0162] [Table 12] TIFF0007873242000016.tif92170

[0163] Furthermore, in the optical system 1000 according to the second embodiment, at least one of the fifth lens 150, the sixth lens 160, and the seventh lens 170 may have a tangent angle set to improve the optical characteristics of light incident on an area of ​​approximately 65% ​​or more of the peripheral portion (field of view).

[0164] [Table 13]

[0165] More specifically, Table 13 shows the tangent angles with respect to the imaginary line L0 at any position on the ninth surface S9 of the fifth lens 150, the eleventh surface S11 of the sixth lens 160, and the fourteenth surface S14 of the seventh lens 170 according to the third embodiment. Referring to Table 13 and Figures 2 to 4 above, the fifth lens 150 may include the first point P1 where the tangent angle L1 with respect to the imaginary line LO extending in the direction perpendicular to the optical axis OA is about 40 or more. The first point P1 can be located at a position about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.495 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first point P1 can be located at a position about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.725 mm or more. The fifth lens 150 may include a first-first point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. The first-first point can be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.725 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first-first point may be located at a position of about 85% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.955 mm or more. The fifth lens 150 may include a first-second point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 60 degrees or more. The first and second points can be located at a position of approximately 80% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 1.84 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first and second points can be located at a position of approximately 90% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.07 mm or more.

[0166] The sixth lens 160 may include a second point P2 where the angle of the tangent L2 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The second point P2 can be located at a position of about 65% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.976 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, the second point P2 may be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 2.28 mm or more. The sixth lens 160 may include a second-first point (not shown) located on the 11th surface S11 where the angle of the tangent L2 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 2-1 can be located at a position of approximately 75% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 2.28 mm or more, when the optical axis OA is the starting point and the end point is the end of the 11th surface S11 of the 6th lens 160. More specifically, point 2-1 can be located at a position of approximately 85% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 2.584 mm or more.

[0167] The sixth lens 160 may include the second-second point (not shown) located on the eleventh surface S11, where the angle of the tangent line L2 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is approximately 60 degrees or more. The second-second point may be located at a position approximately 80% or more of the way from the direction perpendicular to the optical axis OA, for example, at a position of approximately 2.432 mm or more, when the optical axis OA is the starting point and the end of the eleventh surface S11 of the sixth lens 160 is the ending point. More specifically, the second-second point may be located at a position approximately 90% or more of the way from the direction perpendicular to the optical axis OA, for example, at a position of approximately 2.736 mm or more.

[0168] The seventh lens 170 may include a third point P3 where the angle of the tangent L3 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The third point P3 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.2045 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the seventh lens 170 is the ending point. More specifically, the third point P3 may be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.6975 mm or more. The seventh lens 170 may include a third-first point (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 3-1 can be located at a position of approximately 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.6975 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. More specifically, point 3-1 can be located at a position of approximately 83% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 4.0919 mm or more. The 7th lens 170 may include a point 3-2 (not shown) located on the 14th surface S14, where the angle of the tangent line L3 to a virtual line L0 extending in the perpendicular direction of the optical axis OA is approximately 60 degrees or more. Point 3-2 can be located at a position of approximately 80% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.944 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. In detail, point 3-2 may be positioned at a location of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a location of approximately 4.437 mm or more.

[0169] [Table 14]

[0170] [Table 15]

[0171] Table 14 relates to the items in the above-mentioned formulas for the optical system 1000 according to the third embodiment, and concerns the TTL (Total track length), TD, BFL (Back focal length), F-number, ImgH, and the focal lengths f1, f2, f3, f4, f5, f6, f7 of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170, respectively. Table 15 relates to the result values ​​of formulas 1 to 26 mentioned above for the optical system 1000 according to the third embodiment. Referring to Table 15, it can be seen that the optical system 1000 according to the third embodiment satisfies at least one of formulas 1 to 26. In detail, it can be seen that the optical system 1000 according to the third embodiment satisfies all of formulas 1 to 26. As a result, the optical system 1000 according to the third embodiment can be provided with a slimmer structure. Furthermore, the optical system 1000 has improved optical characteristics and can have aberration characteristics as shown in Figure 9. Specifically, Figure 9 is a graph of the aberration characteristics of the optical system 1000 according to the third embodiment, and is a graph in which spherical aberration (Longitudinal Spherical Aberration), astigmatic field curves, and distortion aberration are measured from left to right. In Figure 9, the X axis can represent focal length (mm) and distortion (%), and the Y axis can represent the height of the image from the center of the image. The graph for spherical aberration is for light in the wavelength bands of 436 nm, 486 nm, 546 nm, 588 nm (d-line), and 656 nm, and the graphs for astigmatic aberration and distortion aberration are for light in the wavelength band of 588 nm. That is, referring to Figure 9, the optical system 1000 according to the third embodiment can have improved resolution by having multiple lenses with set shapes, central thickness, spacing in the optical axis OA, focal length, etc. The optical system 1000 can have a greatly curved shape at the periphery of at least one lens surface, such as the 9th surface S9 of the 5th lens 150, the 11th surface S11 of the 6th lens 160, and the 14th surface S14 of the 7th lens 170.As a result, the curved region of the lens surface has a relatively large tangent angle, and astigmatism and distortion in the peripheral area (the area of ​​approximately 65% ​​or more of the field of view FOV) can be effectively corrected. Therefore, the optical system 1000 according to the third embodiment can have improved optical characteristics by effectively correcting aberrations in the peripheral area (the area of ​​approximately 65% ​​or more of the field of view FOV).

[0172] The optical system 1000 according to the fourth embodiment will be described in more detail with reference to Figures 10 and 11. In the explanation using Figures 10 and 11, the same components as those described above will not be explained, and the same or similar components will be given the same reference numerals. Figure 10 is a diagram of the configuration of the optical system according to the fourth embodiment, and Figure 11 is a graph showing the aberration characteristics of the optical system according to the fourth embodiment.

[0173] Referring to Figures 10 and 11, the optical system 1000 according to the fourth embodiment may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an image sensor 300, which are arranged sequentially from the object side to the image side. The first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 may be arranged sequentially along the optical axis OA of the optical system 1000.

[0174] The optical system 1000 according to the fourth embodiment may include an aperture (not shown). The aperture may be positioned in front of the first lens 110. A filter 500 may be positioned between the plurality of lenses 100 and the image sensor 300. In particular, the filter 500 may be positioned between the seventh lens 170 and the image sensor 300.

[0175] [Table 16]

[0176] Table 16 shows the radius of curvature, thickness of each lens in the optical axis OA, distance between each lens in the optical axis OA, refractive index in the d-line, Abbe's number, and size of the clear aperture CA of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170 according to the fourth embodiment. Referring to Figure 10 and Table 16, the first lens 110 of the optical system 1000 according to the fourth embodiment can have a positive refractive power in the optical axis OA. In the optical axis OA, the first surface S1 of the first lens 110 may be convex, and the second surface S2 may be concave. The first lens 110 may have a meniscus shape that is convex toward the object side in the optical axis OA. The first surface S1 may be aspherical, and the second surface S2 may be aspherical. At least one of the first surface S1 and the second surface S2 may include an aspheric surface having a 30th-order aspheric coefficient. More specifically, the first surface S1 and the second surface S2 may include an aspheric surface having a 30th-order aspheric coefficient. For example, the first surface S1 and the second surface S2 may have aspheric coefficients as shown in Table 17. In this case, A4 to A30 in Table 17 represent aspheric coefficients from the 4th to the 30th order.

[0177] The second lens 120 may have a negative refractive power in the optical axis OA. In the optical axis OA, the third surface S3 of the second lens 120 may be convex, and the fourth surface S4 may be concave. The second lens 120 may have a meniscus shape that is convex toward the object in the optical axis OA. The third surface S3 may be aspherical, and the fourth surface S4 may be aspherical. At least one of the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the third surface S3 and the fourth surface S4 may have aspherical coefficients as shown in Table 17. In this case, A4 to A30 in Table 17 represent aspherical coefficients from the 4th to the 30th order.

[0178] The third lens 130 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the fifth surface S5 of the third lens 130 may be convex, and the sixth surface S6 may be concave. The third lens 130 may have a meniscus shape that is convex toward the object in the optical axis OA. The fifth surface S5 may be aspherical, and the sixth surface S6 may be aspherical. At least one of the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the fifth surface S5 and the sixth surface S6 may have aspherical coefficients as shown in Table 17. In this case, A4 to A30 in Table 17 represent aspherical coefficients from the 4th to the 30th order.

[0179] The fourth lens 140 may have a negative refractive power in the optical axis OA. In the optical axis OA, the seventh surface S7 of the fourth lens 140 may be concave, and the eighth surface S8 may be convex. The fourth lens 140 may have a meniscus shape that is convex towards the image side in the optical axis OA. The seventh surface S7 may be aspherical, and the eighth surface S8 may be aspherical. At least one of the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the seventh surface S7 and the eighth surface S8 may have aspherical coefficients as shown in Table 17. In this case, A4 to A30 in Table 17 represent aspherical coefficients from the 4th to the 30th order.

[0180] The fifth lens 150 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the ninth surface S9 of the fifth lens 150 may be convex, and the tenth surface S10 may be concave. The fifth lens 150 may have a meniscus shape that is convex toward the object side in the optical axis OA. The ninth surface S9 may be aspherical, and the tenth surface S10 may be aspherical. At least one of the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the ninth surface S9 and the tenth surface S10 may have aspherical coefficients as shown in Table 17. In this case, A4 to A30 in Table 17 represent aspherical coefficients from the 4th to the 30th order.

[0181] The sixth lens 160 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the eleventh surface S11 of the sixth lens 160 may be concave, and the twelfth surface S12 may be convex. Both surfaces of the sixth lens 160 may be convex in the optical axis OA. The eleventh surface S11 may be aspherical, and the twelfth surface S12 may be aspherical. At least one of the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the eleventh surface S11 and the twelfth surface S12 may have aspherical coefficients as shown in Table 17. In this case, A4 to A30 in Table 17 represent aspherical coefficients from the 4th to the 30th order.

[0182] The seventh lens 170 may have a negative refractive power in the optical axis OA. In the optical axis OA, the thirteenth surface S13 of the seventh lens 170 may be concave, and the fourteenth surface S14 may also be concave. Both surfaces of the seventh lens 170 may be concave in the optical axis OA. The thirteenth surface S13 may be aspherical, and the fourteenth surface S14 may also be aspherical. At least one of the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. More specifically, the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the thirteenth surface S13 and the fourteenth surface S14 may have aspherical coefficients as shown in Table 17. In this case, A4 to A30 in Table 17 represent aspherical coefficients from the fourth to the thirtieth order.

[0183] The values ​​of the aspherical coefficients for each lens surface in the optical system 1000 according to the fourth embodiment are as shown in Table 17 below.

[0184] [Table 17] TIFF0007873242000022.tif87170

[0185] In the optical system 1000 according to the fourth embodiment, at least one of the fifth lens 150, the sixth lens 160, and the seventh lens 170 may have a tangent angle set to improve the optical characteristics of light incident on an area of ​​approximately 65% ​​or more of the peripheral area (field of view).

[0186] [Table 18]

[0187] More specifically, Table 18 shows the tangent angles with respect to the imaginary line L0 at any position of the ninth surface S9 of the fifth lens 150, the eleventh surface S11 of the sixth lens 160, and the fourteenth surface S14 of the seventh lens 170 according to the fourth embodiment. Referring to Table 18 and Figures 2 to 4 above, the fifth lens 150 may include the first point P1 where the tangent angle L1 with respect to the imaginary line LO extending in the direction perpendicular to the optical axis OA is about 40 or more. The first point P1 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.4885 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first point P1 can be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.7175 mm or more. The fifth lens 150 may include a first-first point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. The first-first point can be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.7175 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first-first point may be located at a position of about 85% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.9465 mm or more. The fifth lens 150 may include a first-second point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 60 degrees or more. The first and second points can be located at a position of approximately 80% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 1.832 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first and second points can be located at a position of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 2.061 mm or more.

[0188] The sixth lens 160 may include a second point P2 where the angle of the tangent L2 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The second point P2 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.963 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, the second point P2 may be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 2.265 mm or more. The sixth lens 160 may include a second-first point (not shown) located on the 11th surface S11 where the angle of the tangent L2 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 2-1 can be located at a position of approximately 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.265 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, point 2-1 can be located at a position of approximately 85% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.567 mm or more. The sixth lens 160 may include point 2-2 (not shown) located on the 11th surface S11, where the angle of the tangent L2 to a virtual line L0 extending in the perpendicular direction of the optical axis OA is approximately 60 degrees or more. Point 2-2 can be located at a position of approximately 80% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.416 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, the 2-2 point may be positioned at a location of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a location of approximately 2.718 mm or more.

[0189] The seventh lens 170 may include a third point P3 where the angle of the tangent L3 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The third point P3 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.211 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the seventh lens 170 is the ending point. More specifically, the third point P3 may be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.705 mm or more. The seventh lens 170 may include a third-first point (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 3-1 can be located at a position of approximately 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.705 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. More specifically, point 3-1 can be located at a position of approximately 83% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 4.1002 mm or more. The 7th lens 170 may include a point 3-2 (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the perpendicular direction of the optical axis OA is approximately 60 degrees or more. Point 3-2 can be located at a position of approximately 80% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.952 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. In detail, point 3-2 may be positioned at a location of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a location of approximately 4.446 mm or more.

[0190] [Table 19]

[0191] [Table 20]

[0192] Table 19 relates to the items in the above-mentioned formulas for the optical system 1000 according to the fourth embodiment, and concerns the TTL (Total track length), TD, BFL (Back focal length), F-number, ImgH, and the focal lengths f1, f2, f3, f4, f5, f6, f7 of the first to seventh lenses 110, 120, 130, 140, 150, 160, and 170, respectively. Table 20 concerns the result values ​​of formulas 1 to 26 mentioned above for the optical system 1000 according to the fourth embodiment. Referring to Table 20, it can be seen that the optical system 1000 according to the fourth embodiment satisfies at least one of formulas 1 to 26. In detail, it can be seen that the optical system 1000 according to the fourth embodiment satisfies all of formulas 1 to 26. As a result, the optical system 1000 according to the fourth embodiment can be provided with a slimmer structure. Furthermore, the optical system 1000 has improved optical characteristics and can have aberration characteristics as shown in Figure 11. Specifically, Figure 11 is a graph of the aberration characteristics of the optical system 1000 according to the fourth embodiment, and is a graph in which spherical aberration (Longitudinal Spherical Aberration), astigmatic field curves, and distortion aberration are measured from left to right. In Figure 11, the X axis can represent focal length (mm) and distortion (%), and the Y axis can represent the height of the image from the center of the image. The graph for spherical aberration is for light in the wavelength bands of 436 nm, 486 nm, 546 nm, 588 nm (d-line), and 656 nm, and the graphs for astigmatic aberration and distortion aberration are for light in the wavelength band of 588 nm. That is, referring to Figure 11, the optical system 1000 according to the fourth embodiment can have improved resolution by having multiple lenses with set shapes, central thickness, spacing in the optical axis OA, focal length, etc. The optical system 1000 can have a greatly curved shape at the periphery of at least one lens surface, such as the 9th surface S9 of the 5th lens 150, the 11th surface S11 of the 6th lens 160, and the 14th surface S14 of the 7th lens 170.As a result, the curved region of the lens surface has a relatively large tangent angle, and astigmatism and distortion in the peripheral area (the area of ​​approximately 65% ​​or more of the field of view FOV) can be effectively corrected. Therefore, the optical system 1000 according to the fourth embodiment can have improved optical characteristics by effectively correcting aberrations in the peripheral area (the area of ​​approximately 65% ​​or more of the field of view FOV).

[0193] The optical systems of the fifth and sixth embodiments will be described in more detail with reference to Figures 12 to 15. The optical systems 1000 of the fifth and sixth embodiments may include a lens group containing eight lenses. More specifically, the optical systems 1000 of the fifth and sixth embodiments may have an additional eighth lens 180 compared to the first to fourth embodiments described above.

[0194] The eighth lens 180 may be positioned closest to the image sensor 300 among the plurality of lenses 100. That is, the eighth lens 180 may be positioned between the seventh lens 170 and the image sensor 300. As a result, light corresponding to information about an object can pass through the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, the seventh lens 170, and the eighth lens 180 before entering the image sensor 300.

[0195] The eighth lens 180 may have a positive (+) or negative (-) refractive power in the optical axis OA. The eighth lens 180 may be made of plastic or glass material. For example, the eighth lens 180 may be made of plastic material. The eighth lens 180 may include a 15th surface S15 defined as an object side and a 16th surface S16 defined as an image side. In the optical axis OA, the 15th surface S15 may be convex, and the 16th surface S16 may be concave. That is, the eighth lens 180 may have a meniscus shape that is convex towards the object side in the optical axis OA. Alternatively, in the optical axis OA, the 15th surface S15 may be convex, and the 16th surface S16 may be convex. That is, both sides of the eighth lens 180 may be convex in the optical axis OA. In contrast, in the optical axis OA, the 15th surface S15 may be convex, and the 16th surface S16 may be planar (infinity). In contrast, in the optical axis OA, the 15th surface S15 may be concave, and the 16th surface S16 may be convex. That is, the 8th lens 180 can have a meniscus shape that is convex towards the image side in the optical axis OA. In contrast, in the optical axis OA, the 15th surface S15 may be concave, and the 16th surface S16 may be concave. That is, both surfaces of the 8th lens 180 can be concave in the optical axis OA. At least one of the 15th surface S15 and the 16th surface S16 may be aspherical. At least one of the 15th surface S15 and the 16th surface S16 may include an aspherical surface having a 30th-order aspherical coefficient.

[0196] The eighth lens 180 may include an effective region and an ineffective region. The effective region of the eighth lens 180 may be the region through which incident light passes. That is, the effective region may be the region where incident light is refracted and exhibits optical properties. The ineffective region of the eighth lens 180 may be located around the effective region of the eighth lens 180. The ineffective region may be a region through which no light is incident. That is, the ineffective region may be a region unrelated to the optical properties. Furthermore, the ineffective region may be a region fixed to a barrel (not shown) or the like that houses the lens.

[0197] If the optical system 1000 further includes the eighth lens 180, then at least one of the above-mentioned formulas (formulas 1 to 26) and the formulas described below can be further satisfied. As a result, the optical system 1000 according to the embodiment can have improved optical characteristics. Furthermore, the optical system 1000 according to the embodiment can have a slimmer structure.

[0198] [Number 28] |L1R1| / |L8S2|<0.1

[0199] In equation 28, L1R1 represents the radius of curvature of the object side surface (first surface S1) of the first lens 110, and L8S2 represents the radius of curvature of the image side surface (16th surface S16) of the eighth lens 180. More specifically, equation 28 can satisfy |L1R1| / |L8S2|<0.06 considering the optical characteristics of the peripheral area. More specifically, equation 28 can satisfy |L1R1| / |L8S2|<0.02.

[0200] [Number 29] 0.3 <CA_L1S1 / CA_L8S2<0.4

[0201] In Equation 29, CA_L1S1 represents the size of the effective diameter CA of the object side surface (the first surface S1) of the first lens 110, and CA_L8S2 represents the size of the effective diameter CA of the image side surface (the 16th surface S16) of the eighth lens 180. Specifically, Equation 29 can satisfy 0.31 < CA_L1S1 / CA_L8S2 < 0.395 in consideration of the optical characteristics of the peripheral portion. More specifically, Equation 29 can satisfy 0.32 < CA_L1S1 / CA_L8S2 < 0.39.

[0202] Referring to FIGS. 12 and 13, the optical system 1000 according to the fifth embodiment will be described in more detail. In the description using FIGS. 12 and 13, descriptions of the same or similar configurations as those of the aforementioned optical system will be omitted, and the same or similar configurations will be given the same reference numerals. FIG. 12 is a configuration diagram of the optical system according to the fifth embodiment, and FIG. 13 is a graph showing the aberration characteristics of the optical system according to the fifth embodiment.

[0203] Referring to FIGS. 12 and 13, the optical system 1000 according to the fifth embodiment may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and an image sensor 300 that are sequentially arranged in the direction from the object side to the image side. The first to eighth lenses 110, 120, 130, 140, 150, 160, 170, 180 may be sequentially arranged along the optical axis OA of the optical system 1000. Also, in the optical system 1000 according to the fifth embodiment, the object side surface (the third surface S3) of the second lens 120 can serve as an aperture. Also, a filter 500 may be arranged between the plurality of lenses 100 and the image sensor 300. Specifically, the filter 500 may be arranged between the eighth lens 180 and the image sensor 300.

[0204]

Table 21

[0205] Table 21 shows the radius of curvature, thickness of each lens in the optical axis OA, distance between each lens in the optical axis OA, refractive index in the d-line, Abbe's number, and size of the clear aperture CA of the first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180 according to the fifth embodiment. Referring to Figure 12 and Table 21, the first lens 110 of the optical system 1000 according to the fifth embodiment can have a positive refractive power in the optical axis OA. In the optical axis OA, the first surface S1 of the first lens 110 may be convex, and the second surface S2 may be concave. The first lens 110 can have a meniscus shape that is convex toward the object side in the optical axis OA. The first surface S1 may be an aspherical surface, and the second surface S2 may be an aspherical surface. At least one of the first surface S1 and the second surface S2 may include an aspherical surface having a 30th-order aspherical coefficient. More specifically, the first surface S1 and the second surface S2 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the first surface S1 and the second surface S2 may have aspherical coefficients as shown in Table 22. In this case, A4 to A30 in Table 22 represent aspherical coefficients from the 4th to the 30th order.

[0206] The second lens 120 may have a negative refractive power in the optical axis OA. In the optical axis OA, the third surface S3 of the second lens 120 may be convex, and the fourth surface S4 may be concave. The second lens 120 may have a meniscus shape that is convex toward the object in the optical axis OA. The third surface S3 may be aspherical, and the fourth surface S4 may be aspherical. At least one of the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the third surface S3 and the fourth surface S4 may have aspherical coefficients as shown in Table 22. In this case, A4 to A30 in Table 22 represent aspherical coefficients from the 4th to the 30th order.

[0207] The third lens 130 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the fifth surface S5 of the third lens 130 may be convex, and the sixth surface S6 may be concave. The third lens 130 may have a meniscus shape that is convex toward the object in the optical axis OA. The fifth surface S5 may be aspherical, and the sixth surface S6 may be aspherical. At least one of the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the fifth surface S5 and the sixth surface S6 may have aspherical coefficients as shown in Table 22. In this case, A4 to A30 in Table 22 represent aspherical coefficients from the 4th to the 30th order.

[0208] The fourth lens 140 may have a negative refractive power in the optical axis OA. In the optical axis OA, the seventh surface S7 of the fourth lens 140 may be concave, and the eighth surface S8 may be convex. The fourth lens 140 may have a meniscus shape that is convex towards the image side in the optical axis OA. The seventh surface S7 may be aspherical, and the eighth surface S8 may be aspherical. At least one of the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the seventh surface S7 and the eighth surface S8 may have aspherical coefficients as shown in Table 22. In this case, A4 to A30 in Table 22 represent aspherical coefficients from the 4th to the 30th order.

[0209] The fifth lens 150 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the ninth surface S9 of the fifth lens 150 may be convex, and the tenth surface S10 may be concave. The fifth lens 150 may have a meniscus shape that is convex toward the object in the optical axis OA. The ninth surface S9 may be aspherical, and the tenth surface S10 may be aspherical. At least one of the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the ninth surface S9 and the tenth surface S10 may have aspherical coefficients as shown in Table 22. In this case, A4 to A30 in Table 22 represent aspherical coefficients from the 4th to the 30th order.

[0210] The sixth lens 160 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the eleventh surface S11 of the sixth lens 160 may be concave, and the twelfth surface S12 may be convex. Both surfaces of the sixth lens 160 may be convex in the optical axis OA. The eleventh surface S11 may be aspherical, and the twelfth surface S12 may be aspherical. At least one of the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the eleventh surface S11 and the twelfth surface S12 may have aspherical coefficients as shown in Table 22. In this case, A4 to A30 in Table 22 represent aspherical coefficients from the 4th to the 30th order.

[0211] The seventh lens 170 may have a negative refractive power in the optical axis OA. In the optical axis OA, the thirteenth surface S13 of the seventh lens 170 may be concave, and the fourteenth surface S14 may also be concave. Both surfaces of the seventh lens 170 may be concave in the optical axis OA. The thirteenth surface S13 may be aspherical, and the fourteenth surface S14 may also be aspherical. At least one of the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. More specifically, the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the thirteenth surface S13 and the fourteenth surface S14 may have aspherical coefficients as shown in Table 22. In this case, A4 to A30 in Table 22 represent aspherical coefficients from the 4th to the 30th order.

[0212] The eighth lens 180 may have a positive (+) refractive power at the optical axis OA. At the optical axis OA, the 15th surface S15 of the eighth lens 180 may be convex, and the 16th surface S16 of the eighth lens 180 may be planar (infinity). The 15th surface S15 may be aspherical. The 15th surface S15 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the 15th surface S15 may have aspherical coefficients as shown in Table 22. In this case, A4 to A30 in Table 22 represent aspherical coefficients from the 4th to the 30th order.

[0213] The values ​​of the aspherical coefficients for each lens surface in the optical system 1000 according to the fifth embodiment are as shown in Table 22 below.

[0214] [Table 22]

[0215] In the optical system 1000 according to the fifth embodiment, at least one of the fifth lens 150, the sixth lens 160, and the seventh lens 170 may have a tangent angle set to improve the optical characteristics of light incident on the peripheral area (an area of ​​approximately 65% ​​or more of the field of view).

[0216] [Table 23]

[0217] More specifically, Table 23 shows the tangent angles with respect to the imaginary line L0 at any position on the ninth surface S9 of the fifth lens 150, the eleventh surface S11 of the sixth lens 160, and the fourteenth surface S14 of the seventh lens 170 according to the fifth embodiment. Referring to Table 23 and Figures 2 to 4 above, the fifth lens 150 may include the first point P1 where the tangent angle L1 with respect to the imaginary line LO extending in the direction perpendicular to the optical axis OA is about 40 or more. The first point P1 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.4885 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first point P1 can be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.7175 mm or more. The fifth lens 150 may include a first-first point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. The first-first point can be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.7175 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first-first point may be located at a position of about 85% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.9465 mm or more. The fifth lens 150 may include a first-second point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 60 degrees or more. The first and second points can be located at a position of approximately 80% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 1.832 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first and second points can be located at a position of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 2.061 mm or more.

[0218] The sixth lens 160 may include a second point P2 where the angle of the tangent L2 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The second point P2 can be located at a position of about 65% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.963 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, the second point P2 can be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.872 mm or more. More specifically, the second point P2 can be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 2.16 mm or more.

[0219] The sixth lens 160 may include a second-first point (not shown) located on the eleventh surface S11, where the angle of the tangent L2 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. The second-first point can be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 2.16 mm or more, when the optical axis OA is the starting point and the end of the eleventh surface S11 of the sixth lens 160 is the ending point. More specifically, the second-first point may be located at a position of about 85% or more of the vertical direction of the optical axis OA, for example, at a position of about 2.448 mm or more. The sixth lens 160 may include a second-second point (not shown) located on the eleventh surface S11, where the angle of the tangent L2 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 60 degrees or more. The 2-2 point can be positioned at a location approximately 80% or more of the way from the optical axis OA, for example, at a location approximately 2.304 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the 6th lens 160 is the ending point. More specifically, the 2-2 point can be positioned at a location approximately 90% or more of the way from the optical axis OA, for example, at a location approximately 2.592 mm or more.

[0220] The seventh lens 170 may include a third point P3 where the angle of the tangent L3 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The third point P3 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.1915 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the seventh lens 170 is the ending point. More specifically, the third point P3 may be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.6825 mm or more. The seventh lens 170 may include a third-first point (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 3-1 can be located at a position of approximately 75% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 3.6825 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. More specifically, point 3-1 can be located at a position of approximately 83% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 4.0753 mm or more. The 7th lens 170 may include a point 3-2 (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the vertical direction of the optical axis OA is approximately 60 degrees or more. Point 3-2 can be located at a position of approximately 80% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 3.928 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. In detail, point 3-2 may be positioned at a location of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a location of approximately 4.419 mm or more.

[0221] [Table 24]

[0222] [Table 25]

[0223] Table 24 relates to the items of the formulas described above for the optical system 1000 according to the fifth embodiment, and concerns the TTL (Total track length), TD, BFL (Back focal length), F-number, ImgH, and the focal lengths f1, f2, f3, f4, f5, f6, f7, f8 of the first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180, respectively. Table 25 concerns the result values ​​of formulas 1 to 26, formula 28, and formula 29 described above for the optical system 1000 according to the fifth embodiment. Referring to Table 25, it can be seen that the optical system 1000 according to the fifth embodiment satisfies at least one of formulas 1 to 26, formula 28, and formula 29. In detail, it can be seen that the optical system 1000 according to the fifth embodiment satisfies all of the above equations 1 to 26, 28, and 29. As a result, the optical system 1000 according to the fifth embodiment can be provided with a slimmer structure. Furthermore, the optical system 1000 has improved optical characteristics and can have aberration characteristics as shown in Figure 13. In detail, Figure 13 is a graph of the aberration characteristics of the optical system 1000 according to the fifth embodiment, and is a graph in which spherical aberration (Longitudinal Spherical Aberration), astigmatic field curves, and distortion are measured from left to right. In Figure 13, the X axis can represent focal length (mm) and distortion (%), and the Y axis can represent the height of the image from the center of the image. Furthermore, the graph for spherical aberration is for light in the wavelength bands of 436 nm, 486 nm, 546 nm, 588 nm (d-line), and 656 nm, while the graph for astigmatism and distortion is for light in the wavelength band of 588 nm. That is, referring to Figure 13, the optical system 1000 according to the fifth embodiment can have improved resolution by having multiple lenses with set shapes, central thickness, spacing on the optical axis OA, focal length, etc. The optical system 1000 can have a greatly curved shape at the periphery of at least one lens surface of the ninth surface S9 of the fifth lens 150, the eleventh surface S11 of the sixth lens 160, and the fourteenth surface S14 of the seventh lens 170.As a result, the curved region of the lens surface has a relatively large tangent angle, and astigmatism and distortion in the peripheral area (the area of ​​approximately 65% ​​or more of the field of view FOV) can be effectively corrected. Therefore, the optical system 1000 according to the fifth embodiment can have improved optical characteristics by effectively correcting aberrations in the peripheral area (the area of ​​approximately 65% ​​or more of the field of view FOV).

[0224] The optical system 1000 according to the sixth embodiment will be described in more detail with reference to Figures 14 and 15. In the explanation using Figures 14 and 15, the explanation of the same or similar components as those described above will be omitted, and the same or similar components will be assigned the same reference numerals. Figure 14 is a configuration diagram of the optical system according to the sixth embodiment, and Figure 15 is a graph showing the aberration characteristics of the optical system according to the sixth embodiment.

[0225] Referring to Figures 14 and 15, the optical system 1000 according to the sixth embodiment may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and an image sensor 300, which are arranged sequentially from the object side to the image side. The first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180 may be arranged sequentially along the optical axis OA of the optical system 1000. In the optical system 1000 according to the sixth embodiment, the object side (third surface S3) of the second lens 120 can function as an aperture. Furthermore, a filter 500 may be placed between the plurality of lenses 100 and the image sensor 300. In particular, the filter 500 may be placed between the eighth lens 180 and the image sensor 300.

[0226] [Table 26]

[0227] Table 26 shows the radius of curvature, thickness of each lens in the optical axis OA, distance between each lens in the optical axis OA, refractive index in the d-line, Abbe's number, and size of the clear aperture CA for the first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180 in the sixth embodiment.

[0228] Referring to Figure 14 and Table 26, the first lens 110 of the optical system 1000 according to the sixth embodiment can have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the first surface S1 of the first lens 110 may be convex, and the second surface S2 may be concave. The first lens 110 can have a meniscus shape that is convex toward the object side in the optical axis OA. The first surface S1 may be aspherical, and the second surface S2 may be aspherical. At least one of the first surface S1 and the second surface S2 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the first surface S1 and the second surface S2 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the first surface S1 and the second surface S2 may have aspherical coefficients as shown in Table 27. In this case, A4 to A30 in Table 27 represent aspherical coefficients from the 4th to the 30th order.

[0229] The second lens 120 may have a negative refractive power in the optical axis OA. In the optical axis OA, the third surface S3 of the second lens 120 may be convex, and the fourth surface S4 may be concave. The second lens 120 may have a meniscus shape that is convex toward the object in the optical axis OA. The third surface S3 may be aspherical, and the fourth surface S4 may be aspherical. At least one of the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the third surface S3 and the fourth surface S4 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the third surface S3 and the fourth surface S4 may have aspherical coefficients as shown in Table 27. In this case, A4 to A30 in Table 27 represent aspherical coefficients from the 4th to the 30th order.

[0230] The third lens 130 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the fifth surface S5 of the third lens 130 may be convex, and the sixth surface S6 may be concave. The third lens 130 may have a meniscus shape that is convex toward the object in the optical axis OA. The fifth surface S5 may be aspherical, and the sixth surface S6 may be aspherical. At least one of the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the fifth surface S5 and the sixth surface S6 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the fifth surface S5 and the sixth surface S6 may have aspherical coefficients as shown in Table 27. In this case, A4 to A30 in Table 27 represent aspherical coefficients from the 4th to the 30th order.

[0231] The fourth lens 140 may have a negative refractive power in the optical axis OA. In the optical axis OA, the seventh surface S7 of the fourth lens 140 may be concave, and the eighth surface S8 may be convex. The fourth lens 140 may have a meniscus shape that is convex towards the image side in the optical axis OA. The seventh surface S7 may be aspherical, and the eighth surface S8 may be aspherical. At least one of the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the seventh surface S7 and the eighth surface S8 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the seventh surface S7 and the eighth surface S8 may have aspherical coefficients as shown in Table 27. In this case, A4 to A30 in Table 27 represent aspherical coefficients from the 4th to the 30th order.

[0232] The fifth lens 150 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the ninth surface S9 of the fifth lens 150 may be convex, and the tenth surface S10 may be concave. The fifth lens 150 may have a meniscus shape that is convex toward the object in the optical axis OA. The ninth surface S9 may be aspherical, and the tenth surface S10 may be aspherical. At least one of the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the ninth surface S9 and the tenth surface S10 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the ninth surface S9 and the tenth surface S10 may have aspherical coefficients as shown in Table 27. In this case, A4 to A30 in Table 27 represent aspherical coefficients from the 4th to the 30th order.

[0233] The sixth lens 160 may have a positive (+) refractive power in the optical axis OA. In the optical axis OA, the eleventh surface S11 of the sixth lens 160 may be concave, and the twelfth surface S12 may be convex. Both surfaces of the sixth lens 160 may be convex in the optical axis OA. The eleventh surface S11 may be aspherical, and the twelfth surface S12 may be aspherical. At least one of the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the eleventh surface S11 and the twelfth surface S12 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the eleventh surface S11 and the twelfth surface S12 may have aspherical coefficients as shown in Table 27. In this case, A4 to A30 in Table 27 represent aspherical coefficients from the 4th to the 30th order.

[0234] The seventh lens 170 may have a negative refractive power at the optical axis OA. At the optical axis OA, the thirteenth surface S13 of the seventh lens 170 may be concave, and the fourteenth surface S14 may be planar (infinity). The thirteenth surface S13 may be aspherical, and the fourteenth surface S14 may be aspherical. At least one of the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. In detail, the thirteenth surface S13 and the fourteenth surface S14 may include an aspherical surface having a 30th-order aspherical coefficient. For example, the thirteenth surface S13 and the fourteenth surface S14 may have aspherical coefficients as shown in Table 27. In this case, A4 to A30 in Table 27 represent aspherical coefficients from the 4th to the 30th order.

[0235] The eighth lens 180 can have a negative refractive power on the optical axis OA. On the optical axis OA, the 15th surface S15 of the eighth lens 180 may have a concave shape, and the 16th surface S16 of the eighth lens 180 can be a flat surface (infinity). At least one of the 15th surface S15 and the 16th surface S16 can be an aspherical surface. At least one of the 15th surface S15 and the 16th surface S16 can include an aspherical surface having an aspherical coefficient of 30th order. Specifically, the 15th surface S15 and the 16th surface S16 can include an aspherical surface having an aspherical coefficient of 30th order. For example, the 15th surface S15 and the 16th surface S16 can have an aspherical coefficient as shown in Table 27. At this time, A4 to A30 in Table 27 mean aspherical coefficients from the 4th order to the 30th order.

[0236] In the optical system 1000 according to the sixth embodiment, the values of the aspherical coefficients of each lens surface are as shown in Table 27 below.

[0237]

Table 27

[0238] In the optical system 1000 according to the sixth embodiment, at least one of the fifth lens 150, the sixth lens 160, and the seventh lens 170 can have a tangent angle set to improve the optical characteristics of light incident on the peripheral portion (region of about 65% or more of the picture angle FOV).

[0239]

Table 28

[0240] More specifically, Table 28 shows the tangent angles with respect to the imaginary line L0 at any position on the ninth surface S9 of the fifth lens 150, the eleventh surface S11 of the sixth lens 160, and the fourteenth surface S14 of the seventh lens 170 according to the sixth embodiment. Referring to Table 28 and Figures 2 to 4 above, the fifth lens 150 may include the first point P1 where the tangent angle L1 with respect to the imaginary line LO extending in the direction perpendicular to the optical axis OA is about 40 or more. The first point P1 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.4495 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first point P1 can be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 1.6725 mm or more. The fifth lens 150 may include a first-first point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. The first-first point can be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.6725 mm or more, when the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point. More specifically, the first-first point may be located at a position of about 85% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.8955 mm or more. The fifth lens 150 may include a first-second point (not shown) on the ninth surface S9 where the angle of the tangent L1 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 60 degrees or more. When the optical axis OA is the starting point and the end of the ninth surface S9 of the fifth lens 150 is the ending point, the first and second points can be located at a position of approximately 80% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 1.7840 mm or more. More specifically, the first and second points can be located at a position of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a position of approximately 2.007 mm or more.

[0241] The sixth lens 160 may include a second point P2 where the angle of the tangent L2 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The second point P2 can be located at a position of about 65% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 1.807 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, the second point P2 may be located at a position of about 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of about 2.085 mm or more. The sixth lens 160 may include a second-first point (not shown) located on the 11th surface S11 where the angle of the tangent L2 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 2-1 can be located at a position of approximately 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.085 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, point 2-1 can be located at a position of approximately 85% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.363 mm or more. The sixth lens 160 may include point 2-2 (not shown) located on the 11th surface S11, where the angle of the tangent L2 to a virtual line L0 extending in the perpendicular direction of the optical axis OA is approximately 60 degrees or more. Point 2-2 can be located at a position of approximately 80% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 2.224 mm or more, when the optical axis OA is the starting point and the end of the 11th surface S11 of the sixth lens 160 is the ending point. More specifically, the 2-2 point may be positioned at a location of approximately 90% or more of the perpendicular direction of the optical axis OA, for example, at a location of approximately 2.502 mm or more.

[0242] The seventh lens 170 may include a third point P3 where the angle of the tangent L3 to a virtual line LO extending in the direction perpendicular to the optical axis OA is about 40 degrees or more. The third point P3 can be located at a position of about 65% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.0095 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the seventh lens 170 is the ending point. More specifically, the third point P3 may be located at a position of about 75% or more of the vertical direction of the optical axis OA, for example, at a position of about 3.4725 mm or more. The seventh lens 170 may include a third-first point (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the direction perpendicular to the optical axis OA is about 50 degrees or more. Point 3-1 can be located at a position of approximately 75% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.4725 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. More specifically, point 3-1 can be located at a position of approximately 83% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.8429 mm or more. The 7th lens 170 may include a point 3-2 (not shown) located on the 14th surface S14, where the angle of the tangent L3 to a virtual line L0 extending in the perpendicular direction of the optical axis OA is approximately 60 degrees or more. Point 3-2 can be located at a position of approximately 80% or more of the perpendicular direction of the optical axis OA, for example, at a position of approximately 3.704 mm or more, when the optical axis OA is the starting point and the end of the 14th surface S14 of the 7th lens 170 is the ending point. In detail, point 3-2 may be positioned at a location of approximately 90% or more of the vertical direction of the optical axis OA, for example, at a location of approximately 4.167 mm or more.

[0243] [Table 29]

[0244] [Table 30]

[0245] Table 29 relates to the items of the formulas described above in the optical system 1000 according to the sixth embodiment, and concerns the TTL (Total track length), TD, BFL (Back focal length), F-number, ImgH, and the focal lengths f1, f2, f3, f4, f5, f6, f7, f8 of the first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180, respectively. Table 30 concerns the result values ​​of formulas 1 to 26, formula 28, and formula 29 described above in the optical system 1000 according to the sixth embodiment. Referring to Table 30, it can be seen that the optical system 1000 according to the sixth embodiment satisfies at least one of formulas 1 to 26, formula 28, and formula 29. In detail, it can be seen that the optical system 1000 according to the sixth embodiment satisfies all of the above equations 1 to 26, 28, and 29. As a result, the optical system 1000 according to the sixth embodiment can be provided with a slimmer structure. Furthermore, the optical system 1000 has improved optical characteristics and can have aberration characteristics as shown in Figure 15. In detail, Figure 15 is a graph of the aberration characteristics of the optical system 1000 according to the sixth embodiment, and is a graph in which spherical aberration (Longitudinal Spherical Aberration), astigmatic field curves, and distortion aberration are measured from left to right. In Figure 15, the X axis can represent focal length (mm) and distortion (%), and the Y axis can represent the height of the image from the center of the image. Furthermore, the graph for spherical aberration is for light in the wavelength bands of 436 nm, 486 nm, 546 nm, 588 nm (d-line), and 656 nm, while the graph for astigmatism and distortion is for light in the wavelength band of 588 nm. That is, referring to Figure 15, the optical system 1000 according to the sixth embodiment can have improved resolution by having a set shape, central thickness, spacing in the optical axis OA, focal length, etc., in which multiple lenses are set. The optical system 1000 can have a greatly curved shape in the peripheral part of at least one lens surface of the ninth surface S9 of the fifth lens 150, the eleventh surface S11 of the sixth lens 160, and the fourteenth surface S14 of the seventh lens 170.As a result, the curved region of the lens surface has a relatively large tangent angle, and astigmatism and distortion in the peripheral area (the area of ​​approximately 65% ​​or more of the field of view FOV) can be effectively corrected. Therefore, the optical system 1000 according to the sixth embodiment can have improved optical characteristics by effectively correcting aberrations in the peripheral area (the area of ​​approximately 65% ​​or more of the field of view FOV).

[0246] Figure 16 shows the camera module according to the embodiment applied to a mobile terminal. Referring to Figure 16, the mobile terminal 1 may include a camera module 10 provided on the back. The camera module 10 may include an image capture function. The camera module 10 may also include at least one of the following functions: auto focus, zoom, and OIS. The camera module 10 can process still images or video image frames obtained by the image sensor 300 in shooting mode or video call mode. The processed image frames may be displayed on the display unit (not shown) of the mobile terminal 1 and may be stored in memory (not shown). In addition, although not shown in the drawings, the camera module may also be located on the front of the mobile terminal 1. For example, the camera module 10 may include a first camera module 10A and a second camera module 10B. In this case, at least one of the first camera module 10A and the second camera module 10B may include the optical system 1000 described above. As a result, the camera module 10 can have a slim structure and improve distortion and aberration characteristics in the peripheral area (an area of ​​approximately 65% ​​or more of the field of view). The mobile terminal 1 may further include an autofocus device 31. The autofocus device 31 may include an autofocus function using a laser. The autofocus device 31 may be mainly used under conditions where the autofocus function using the image of the camera module 10 is reduced, such as close proximity of 10m or less or in dark environments. The autofocus device 31 may include a light-emitting section including a vertical cavity surface-emitting laser (VCSEL) semiconductor element and a light-receiving section such as a photodiode that converts light energy into electrical energy. The mobile terminal 1 may further include a flash module 33. The flash module 33 may include a light-emitting element that emits light internally. The flash module 33 may be operated by the camera operation of the mobile terminal or by user control.

[0247] The features, structures, and effects described in the examples above are included in at least one embodiment of the present invention and are not necessarily limited to just one embodiment. Furthermore, the features, structures, and effects exemplified in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary skill in the art to which the embodiment belongs. Therefore, such combinations and modifications should be interpreted as being included within the scope of the embodiments of the present invention. The above explanation has focused on embodiments, but these are merely examples and do not limit the present invention. A person with ordinary skill in the art to which the present invention belongs will understand that a variety of modifications and applications not exemplified above are possible without departing from the essential characteristics of these embodiments. For example, each component specifically shown in the embodiments can be modified and implemented. And the differences related to such modifications and applications should be interpreted as being included within the scope of the present invention as defined in the attached claims.

Claims

1. It consists of lenses 1 to 8 arranged along the optical axis from the object side to the image side, The object side of the first lens is convex, the image side is concave, and it has positive refractive power. The object side of the second lens is convex, the image side is concave, and it has a negative refractive power. The object side of the third lens is convex, the image side is concave, and it has positive refractive power. The object side of the fourth lens is concave, the image side is convex, and it has a negative refractive power. The object side of the fifth lens is convex, the image side is concave, and it has a negative refractive power. Both the object side and the image side of the sixth lens are convex and have a positive refractive power. The object side and image side of the seventh lens are both concave and have negative refractive power. An optical system further comprising an eighth lens disposed between the seventh lens and the image sensor, satisfying the following equations 1 to 4. Formula 1: 0.28 < |L1R1| / |f1| < 0.41 Formula 2: n1d < 1.51 Formula 3: 2 < d56 / L5_CT < 2.5 Formula 4: 0.6<d56 / L6_CT<1.2 Formula 5: |L1R1| / |L8R2| < 0.1 (L1R1: radius of curvature of the object side of the first lens, L8R2: Radius of curvature of the image side of the eighth lens, f1: Focal length of the first lens, n1d: Refractive index of the first lens with respect to the d-line wavelength, d56: Distance on the optical axis between the image side of the fifth lens and the object side of the sixth lens, L5_CT: The central thickness of the fifth lens on the optical axis. L6_CT: (Center thickness of the sixth lens along the optical axis)

2. The optical system according to claim 1, wherein the first lens satisfies the following formula. 0.29<|L1R1| / |L1R2|<0.45 (L1R1: radius of curvature of the object side of the first lens, L1R2: Radius of curvature of the image surface of the first lens)

3. The optical system according to claim 1 or 2, wherein the fifth to seventh lenses satisfy the following formula. 0.18<(d56+d67) / TD<0.35 (d67: Distance on the optical axis between the image side of the sixth lens and the object side of the seventh lens, TD: The distance along the optical axis from the vertex of the object side of the first lens to the vertex of the image side of the seventh lens.

4. The central thickness of the first lens is L1_CT, and the central thickness of the second lens is L2_CT. The optical system according to any one of claims 1 to 3, satisfying the formula: 3.5 < L1_CT / L2_CT < 5.

5. The optical system according to any one of claims 1 to 4, wherein at least three of the first to seventh lenses have a 30th-order aspheric coefficient.

Images