KR20230174094A - Optical system and camera module including the same - Google Patents

Abstract

The optical system disclosed in an embodiment of the invention includes first to seventh lenses disposed along an optical axis in the direction from the object side to the sensor side, wherein the first lens has positive refractive power at the optical axis and is convex toward the object side. It has a meniscus shape, the seventh lens has negative refractive power at the optical axis, the object-side surface and the sensor-side surface of the sixth lens have a critical point, and the sensor-side surface of the sixth lens The maximum angle between the normal line passing through the tangent line and the optical axis is Max slope62|, and the maximum angle between the normal line normal to the tangent line passing through the sensor side surface of the sixth lens and the optical axis is Max slope72, Equation: 30 ≤ |Max slope72| ≤ 55 and |Max slope72| < |Max slope62| can be satisfied.

Description

Optical system and camera module including the same {OPTICAL SYSTEM AND CAMERA MODULE INCLUDING THE SAME}

The embodiment relates to an optical system for improved optical performance and a camera module including the same.

Camera modules perform the function of photographing objects and saving them as images or videos, and are installed in various applications. In particular, the camera module is manufactured in an ultra-small size and is applied to not only portable devices such as smartphones, tablet PCs, and laptops, but also drones and vehicles, 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 that automatically adjusts the distance between the image sensor and the imaging lens to align the focal length of the lens, and can focus on distant objects through a zoom lens. The zooming function of zoom up or zoom out can be performed by increasing or decreasing the magnification of the camera. In addition, the camera module adopts image stabilization (IS) technology to correct or prevent image shake caused by camera movement due to an unstable fixation device or the user's movement.

The most important element for this camera module to obtain an image is the imaging lens that forms the image. Recently, interest in high resolution has been increasing, and research is being conducted on optical systems including multiple lenses to realize this. For example, to realize high resolution, research is being conducted using a plurality of imaging lenses with positive (+) or negative (-) refractive power.

However, when a plurality of lenses are included, there is a problem in that it is difficult to obtain excellent optical and aberration characteristics. In addition, when a plurality of lenses are included, the overall length, height, etc. may increase depending on the thickness, spacing, and size of the plurality of lenses, which increases the overall size of the module including the plurality of lenses. There is.

Additionally, the size of image sensors is increasing to realize high resolution and high image quality. However, when the size of the image sensor increases, the total track length (TTL) of the optical system including a plurality of lenses also increases, which causes the thickness of cameras and mobile terminals including the optical system to also increase.

Therefore, a new optical system that can solve the above-mentioned problems is required.

The embodiment seeks to provide an optical system with improved optical characteristics.

The embodiment seeks to provide an optical system with excellent optical performance at the center and periphery of the angle of view.

The embodiment seeks to provide an optical system that can have a slim structure.

The optical system according to the embodiment includes first to seventh lenses disposed along an optical axis in the direction from the object side to the sensor side, wherein the first lens has a positive refractive power at the optical axis and a meniscus convex toward the object side. It has a curs shape, the seventh lens has a negative refractive power at the optical axis, the object-side surface and the sensor-side surface of the sixth lens have a critical point, and a tangent line passing through the sensor-side surface of the sixth lens The maximum angle between the normal line perpendicular to and the optical axis is Max slope62|, and the maximum angle between the normal line perpendicular to the tangent line passing through the sensor side of the sixth lens and the optical axis is Max slope72, equation: 30 ≤ | Max slope72| ≤ 55 and |Max slope72| < |Max slope62| can be satisfied.

According to an embodiment of the invention, the object-side surface of the seventh lens has a critical point, and the critical point of the sensor-side surface of the seventh lens is closer to the edge than the critical points of the object-side surface and the sensor-side surface of the sixth lens. can be placed.

According to an embodiment of the invention, the sensor side of the seventh lens is provided without a critical point from the optical axis to the end of the effective area, and the optical axis distance from the center of the sensor side of the seventh lens to the image surface of the image sensor is BFL, 1/2 of the maximum diagonal length of the image sensor is Imgh, and can satisfy the equation: 0.05 < BFL / Imgh < 0.4.

According to an embodiment of the invention, the optical axis distance from the center of the object-side surface of the first lens to the image surface of the image sensor is TTL, and the equation: 7 < TTL / BFL < 11 can be satisfied.

According to an embodiment of the invention, the optical axis spacing between the sixth and seventh lenses is CG6, the center thickness of the first to seventh lenses is CT1-CT7, and the equation: CT2 + CT3 + CT4 < CG6 can be satisfied. there is.

According to an embodiment of the invention, the optical axis spacing between the fifth and sixth lenses is CG5, and the equation: CT2+CT3+CT4+CT5+CT6 < CG5+CG6 can be satisfied.

According to an embodiment of the invention, the optical axis spacing between the fifth and sixth lenses is CG5, the optical axis spacing between the sixth and seventh lenses is CG6, and the optical axis spacing between the sixth and seventh lenses is CG6, and in a direction perpendicular to the center of the sensor side of the sixth lens. The maximum separation distance from the extending straight line to the sensor side in the optical axis direction is Max_Sag62, and the equation is: CG5 < |Max_Sag62| < CG6 can be satisfied.

According to an embodiment of the invention, the equation: 55 ≤ |Max slope62| ≤ 75 can be satisfied.

According to an embodiment of the invention, the sensor side surface of the seventh lens may have a convex shape at the optical axis.

According to an embodiment of the invention, the third lens may have a shape in which both sides are convex on the optical axis, and the fifth lens may have a shape in which both sides are convex in the optical axis.

According to an embodiment of the invention, the refractive indices of the first and second lenses at the d-line are n1 and n2, and the Abbe numbers of the first and second lenses are v1 and v2, and the equation is: (v2*n2) < (v1*n1) can be satisfied.

An optical system according to an embodiment of the invention includes a first lens having a meniscus shape convex toward an object; a second lens disposed on a sensor side of the first lens; nth lens closest to the image sensor; an n-1th lens disposed on an object side of the nth lens; It includes two or more lenses disposed between the second lens and the n-1th lens, wherein the second lens has the smallest effective diameter among the lenses of the optical system, and the nth lens has the largest effective diameter among the lenses of the optical system. It has an effective diameter, the sum of the central thicknesses of the lenses is ΣCT, the sum of the optical axis spacing between two adjacent lenses is ΣCG, the maximum central thickness of the lenses is CT_Max, and the maximum optical axis spacing between the adjacent lenses is CT_Max. is CG_Max, where n is the total number of lenses in the optical system, and the equations: 0.5 < ΣCT / ΣCG < 1 and 15 < (CT_Max+CG_Max)*n < 30 can be satisfied.

According to an embodiment of the invention, the object side and the sensor side of the n-1th lens may have a critical point.

According to an embodiment of the invention, the n-th lens has a meniscus shape convex toward the sensor side, the n-1th lens has a meniscus shape convex toward the object side, and the object-side surface of the n-th lens is n. The critical point can be located closer to the edge than the critical points of the -1th lens.

According to an embodiment of the invention, the optical axis spacing between the n-th lens and the n-1-th lens is CG6, and CG6 may be greater than the sum of the center thicknesses of four lenses with smaller center thicknesses among all lenses.

According to an embodiment of the invention, the optical axis spacing between the n-1th lens and the n-2th lens is CG5, and the sum of CG5 and CG6 is the sum of the center thicknesses of the four lenses with the largest center thickness among all lenses. It can be bigger than

According to an embodiment of the invention, the optical axis distance from the center of the object side of the first lens to the image surface of the image sensor is TTL, 1/2 of the maximum diagonal length of the image sensor is Imgh, and the sensor of the nth lens The maximum separation distance from the center of the side to the sensor side toward the object based on a straight line extending perpendicular to the optical axis is |Max_Sag72|, the total number of lenses is n, and the equation is: 10 < (TTL/ Imgh)*|Max_Sag72|*n < 20 can be satisfied.

According to an embodiment of the invention, the effective focal length of the optical system is F, 1/2 of the maximum diagonal length of the image sensor is Imgh, and the lens extends from the center of the sensor side of the nth lens in a direction perpendicular to the optical axis. The maximum separation distance from the straight line to the lens surface in the optical axis direction is Max_Sag72, and the equation: 8 < (F/Imgh)*|Max_Sag72|*n < 20 can be satisfied.

According to an embodiment of the invention, the maximum separation distance from the center of the sensor side of the n-1th lens to the sensor side toward the object side based on a straight line extending in a direction perpendicular to the optical axis is Max_Sag62, and the n The maximum separation distance from the center of the sensor side of the second lens to the lens surface in the optical axis direction based on a straight line extending perpendicular to the optical axis is Max_Sag72, and the equation is: |Max_Sag72| < |Max_Sag62| can be satisfied.

According to an embodiment of the invention, it includes an aperture disposed around the object-side surface of the first lens, and the optical system has a composite focal length before the aperture of FOS, a composite focal length after the aperture of FSI, and the equation: : F0S > FSI can be satisfied.

According to an embodiment of the invention, it includes an aperture disposed around the sensor side of the first lens, and the optical system has a composite focal length before the aperture of FOS, a composite focal length after the aperture of FSI, and the equation: : F0S < ｜FSI｜ can be satisfied.

According to an embodiment of the invention, the optical axis distance from the object side center of the first lens group to the image sensor is TTL, the angle of view is FOV, n is the total number of lenses, and the equation: (TTL*n) < FOV is satisfied. You can.

According to an embodiment of the invention, the effective diameter of the object-side surface and the sensor-side surface of the first lens gradually decreases toward the second lens, and the effective diameter may gradually increase from the second lens to the last lens adjacent to the image sensor. .

A camera module according to an embodiment of the invention includes an image sensor disposed on the sensor side of a plurality of lenses; and an optical filter disposed between the image sensor and the last lens, wherein the optical system includes the optical system disclosed above, F is the total focal length, and TTL is from the center of the object side of the lens closest to the object side. It is the distance from the optical axis to the top surface of the sensor, and Imgh is half the maximum diagonal length of the image sensor, equation: 0.5 < F/TTL < 1.5, 0.5 < TTL / Imgh < 3 and 4 < Imgh < TTL can be satisfied.

The optical system and camera module according to the embodiment may have improved optical characteristics. In detail, the optical system may have improved aberration characteristics and resolution due to the surface shape, refractive power, thickness, and spacing between adjacent lenses of a plurality of lenses.

The optical system and camera module according to the embodiment may have improved distortion and aberration control characteristics and may have good optical performance even in the center and periphery of the field of view (FOV).

The optical system according to the embodiment may have improved optical characteristics and a small TTL (Total Track Length), so the optical system and the camera module including the same may be provided in a slim and compact structure.

1 is a configuration diagram of an optical system and a camera module according to a first embodiment of the invention.
FIG. 2 is an explanatory diagram showing the relationship between the image sensor of the optical system of FIG. 1 and the n-2th lens in the nth lens.
FIG. 3 is a table showing lens data according to an embodiment having the optical system of FIG. 1.
Figure 4 is an example of aspherical coefficients of lenses according to the first embodiment of the invention.
Figure 5 is a table showing the thickness of lenses and the spacing between lenses along a direction perpendicular to the optical axis in the optical system according to the first embodiment of the invention.
Figure 6 is a table showing the Sag values of the object side surface and the sensor side surface of the nth lens and the n-1th lens according to the first embodiment of the invention.
Figure 7 is a graph of the diffraction MTF (Diffraction MTF) of the optical system according to the first embodiment of the invention.
Figure 8 is a graph showing aberration characteristics of an optical system according to the first embodiment of the invention.
Figure 9 is a configuration diagram of an optical system and a camera module according to a second embodiment of the invention.
FIG. 10 is a table showing lens data according to an embodiment having the optical system of FIG. 9.
Figure 11 is an example of aspherical coefficients of lenses according to the second embodiment of the invention.
Figure 12 is a table showing the thickness of lenses and the spacing between lenses according to the direction perpendicular to the optical axis in the optical system according to the second embodiment of the invention.
Figure 13 is a table showing the Sag values of the object side surface and the sensor side surface of the nth lens and the n-1th lens according to the second embodiment of the invention.
Figure 14 is a graph of the diffraction MTF (Diffraction MTF) of the optical system according to the second embodiment of the invention.
Figure 15 is a graph showing aberration characteristics of an optical system according to a second embodiment of the invention.
Figure 16 is a configuration diagram of an optical system and a camera module according to a third embodiment of the invention.
FIG. 17 is a table showing lens data according to an embodiment having the optical system of FIG. 16.
Figure 18 is an example of aspherical coefficients of lenses according to the third embodiment of the invention.
Figure 19 is a table showing the thickness of lenses and the spacing between lenses according to the direction perpendicular to the optical axis in the optical system according to the third embodiment of the invention.
Figure 20 is a table showing the Sag values of the object side surface and the sensor side surface of the nth lens and the n-1th lens according to the third embodiment of the invention.
Figure 21 is a graph of the diffraction MTF (Diffraction MTF) of the optical system according to the third embodiment of the invention.
Figure 22 is a graph showing aberration characteristics of an optical system according to a third embodiment of the invention.
Figure 23 is a configuration diagram of an optical system and a camera module according to a fourth embodiment of the invention.
FIG. 24 is a table showing lens data according to an embodiment having the optical system of FIG. 23.
Figure 25 is an example of aspherical coefficients of lenses according to the fourth embodiment of the invention.
Figure 26 is a table showing the thickness of lenses and the spacing between lenses according to the direction perpendicular to the optical axis in the optical system according to the fourth embodiment of the invention.
Figure 27 is a table showing the Sag values of the object side surface and the sensor side surface of the nth lens and the n-1th lens according to the fourth embodiment of the invention.
Figure 28 is a graph of the diffraction MTF (Diffraction MTF) of the optical system according to the fourth embodiment of the invention.
Figure 29 is a graph showing the aberration characteristics of the optical system according to the fourth embodiment of the invention.
Figure 30 is a graph showing a two-dimensional function of a curve connecting points passing through the ends of the effective areas of lenses according to an embodiment of the invention.
Figure 31 is a graph showing a straight line connecting points passing through the ends of the effective area from the second lens to the nth lens according to an embodiment of the invention as a one-dimensional function.
Figure 32 is a graph showing Sag values for the object side and sensor side of the nth and n-1th lenses according to the first embodiment of the invention.
Figure 33 is a diagram showing a camera module according to an embodiment of the invention applied to a mobile terminal.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The technical idea of the present invention is not limited to some of the described embodiments, but can be implemented in various different forms, and one or more of the components between the embodiments can be selectively combined as long as it is within the scope of the technical idea of the present invention. , can be used as a replacement. In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, are generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology.

The terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular may also include the plural unless specifically stated in the phrase, and when described as "at least one (or more than one) of A and B and C", it is combined with A, B, and C. It can contain one or more of all possible combinations. Additionally, when describing the components of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and are not limited to the essence, sequence, or order of the component. And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also is connected to the other component. It may also include cases where other components are 'connected', 'coupled', or 'connected' by another component between them. Additionally, when described as being formed or disposed "above" or "below" each component, "above" or "below" refers not only to cases where two components are in direct contact with each other, but also to one This also includes cases where another component described above is formed or placed between two components. In addition, when expressed as "top (above) or bottom (bottom)", it can include not only the upward direction but also the downward direction based on one component.

In the description of the invention, "object side" may refer to the side of the lens facing the object side based on the optical axis (OA), and "sensor side" may refer to the side of the lens facing the imaging surface (image sensor) based on the optical axis. It can refer to the surface of the lens. That one side of the lens is convex may mean a convex shape in the optical axis or paraxial region, and that one side of the lens is concave may mean a concave shape in the optical axis or paraxial region. The radius of curvature, center thickness, and spacing between lenses listed in the table for lens data may refer to values at the optical axis. The vertical direction may mean a direction perpendicular to the optical axis, and the end of the lens or lens surface may mean the end of the effective area of the lens through which incident light passes. The size of the effective diameter of the lens surface may have a measurement error of up to ±0.4 mm depending on the measurement method. The paraxial area refers to a very narrow area near the optical axis, and is an area where the distance at which light rays fall from the optical axis (OA) is almost zero. Hereinafter, the concave or convex shape of the lens surface is described as the optical axis, and may also include the paraxial region.

FIG. 1 is a configuration diagram of an optical system and a camera module according to a first embodiment of the invention, FIG. 2 is an explanatory diagram showing the relationship between the image sensor of the optical system of FIG. 1, and the n-2th lens in the n-th lens, and FIG. 9 , 16 and 24 are diagrams of the optical system and camera module according to the second to fourth embodiments of the invention.

Referring to FIGS. 1, 2, 9, 16, and 24, the optical system 1000 or camera module may include lens units 100, 100A, 100B, and 100C having a plurality of lenses. The lenses of the lens units 100, 100A, 100B, and 100C may be defined as a plurality of lens groups LG1 and LG2. For example, the optical system 1000 may include a first lens group LG1 and a second lens group LG2 sequentially arranged along the optical axis OA from the object side toward the image sensor 300. . The second lens group LG2 may be disposed on the sensor side of the first lens group LG1. Each of the plurality of lens groups LG1 and LG2 includes at least one lens. The number of lenses of the second lens group LG2 may be greater than the number of lenses of the first lens group LG1, for example, 5 times or more than the number of lenses of the first lens group LG1.

The first lens group LG1 may include two or less lenses. For example, the first lens group LG1 may be one lens. The second lens group LG2 may include 5 or more lenses and 7 or less lenses. The number of lenses of the second lens group (LG2) may be 5 or more more than the number of lenses of the first lens group (LG1). The second lens group LG2 may include, for example, 6 lenses. The optical system 1000 may include 9 or fewer lenses or 8 or fewer lenses.

In the optical system 1000, the total track length (TTL) may be less than 70% of the diagonal length of the image sensor 300, for example, in the range of 40% to 69% or 50% to 65%. The TTL is the distance on the optical axis (OA) from the object side surface of the first lens 101 closest to the object to the image surface of the image sensor 300. The Imgh is 1/2 of the diagonal length of the image sensor 300, and the diagonal length of the image sensor 300 may be twice Imgh. Accordingly, a slim optical system and a camera module having the same can be provided. The total number of lenses in the first and second lens groups (LG1 and LG2) is 6 to 8.

The first lens group LG1 may have positive (+) refractive power. The second lens group LG2 may have a negative refractive power different from that of the first lens group LG1. The first lens group LG1 and the second lens group LG2 have different focal lengths, so they can have good optical performance in the center and periphery of the field of view (FOV). The refractive power is the reciprocal of the focal length.

The first lens group LG1 includes a first lens 101 having a meniscus shape convex toward the object, and the first lens 101 is located at the end of the effective area on the optical axis on the object side and the sensor side. Up to can be provided without a critical point. Accordingly, since there is no critical point in the lenses of the first lens group LG1, the effective diameter of the lenses of the second lens group LG2 adjacent to the first lens group LG1 may not be increased.

In the second lens group LG2, the number of lenses having a critical point on at least one of the object side and the sensor side may be greater than the number of lenses without a critical point on at least one of the object side and the sensor side. . Accordingly, the second lens group LG2 can reduce the TTL and increase the size of the image sensor 300 due to lens surfaces having critical points.

The first lens group (LG1) refracts the light incident through the object side to collect it, and the second lens group (LG2) refracts the light emitted through the first lens group (LG1) to the image sensor 300. ) can be refracted to the surrounding area. Accordingly, the two lens surfaces of the first and second lens groups (LG1, LG2) facing each other, for example, the sensor side surface of the first lens group (LG1) is concave in the optical axis, and the sensor side surface of the second lens group (LG2) is concave. The object side may be convex or concave at the optical axis. Additionally, two lenses facing each other in the first and second lens groups (LG1 and LG2) may have opposite refractive powers.

Two lenses adjacent to the area between the first and second lens groups (LG1 and LG2) may satisfy the following conditions.

Condition 1: Refractive index of a lens with positive refractive power < Refractive index of a lens with negative refractive power

Condition 2: Dispersion value of a lens with positive refractive power > Dispersion value of a lens with negative refractive power

Accordingly, chromatic aberrations generated between the lenses can be mutually corrected.

The focal length (absolute value) of the second lens group LG2 may be greater than the focal length of the first lens group LG1. For example, the focal length (absolute value) of the second lens group LG2 may be more than twice the focal length of the first lens group LG1. Accordingly, the optical system 1000 according to the embodiment can have improved aberration control characteristics such as chromatic aberration and distortion aberration by controlling the refractive power and focal distance of each lens group (LG1, LG2), and can control the center and center of the field of view (FOV). It can have good optical performance in the peripheral area.

On the optical axis OA, the first lens group LG1 and the second lens group LG2 may have a set interval. The optical axis spacing between the first lens group LG1 and the second lens group LG2 on the optical axis OA is the separation distance on the optical axis OA, and among the lenses in the first lens group LG1, the sensor It may be the optical axis interval between the sensor side of the lens closest to the object side and the object side of the lens closest to the object side among the lenses in the second lens group LG2. The optical axis gap between the first lens group (LG1) and the second lens group (LG2) is greater than the central thickness of the first lens 101 of the first lens group (LG1) and the second lens group (LG2) It may be greater than the central thickness of the first lens 102. The optical axis distance between the first lens group (LG1) and the second lens group (LG2) may be greater than 100% of the optical axis distance of the first lens group (LG1), for example, the first lens group (LG1) It may range from 101% to 150% of the optical axis distance. Here, the optical axis distance of the first lens group LG1 is the optical axis distance between the object side of the lens closest to the object side of the first lens group LG1 and the sensor side of the lens closest to the sensor side, for example, , is the central thickness of the first lens 101.

The optical axis spacing between the first lens group LG1 and the second lens group LG2 may be less than 20% of the optical axis distance of the second lens group LG2, for example, 5% to 19% or 8% to 8%. It may be in the 15% range. The optical axis distance of the second lens group LG2 is the optical axis distance between the object side of the lens closest to the object side of the second lens group LG2 and the sensor side of the lens closest to the sensor side.

The effective diameter of the lenses of the first lens group LG1 may be larger than the minimum effective diameter. The lens having the minimum effective diameter may be the lens closest to the first lens group (LG1) among the lenses of the second lens group (LG2). Here, the size of the effective diameter is the average value of the effective diameter of the object-side surface and the effective diameter of the sensor-side surface of each lens. Accordingly, the optical system 1000 can have good optical performance not only in the center of the field of view (FOV) but also in the periphery, and can improve chromatic aberration and distortion aberration.

The effective diameter of the lenses of the optical system 1000 becomes smaller from the object-side lens surface of the first lens group (LG1) to the sensor-side lens surface, and the last lens from the object-side surface of the first lens of the second lens group (LG2) It can gradually increase up to the sensor side of. The lens surface may include an object-side surface and a sensor-side surface of each lens. That is, the effective diameter of the lenses gradually decreases from the adjacent lens closest to the object to the lens surface adjacent between the first and second lens groups LG1 and LG2, and the effective diameter of the lenses gradually decreases from the adjacent lens closest to the object to the lens surface adjacent between the first and second lens groups LG1 and LG2. It can grow gradually from one lens plane to the last lens' lens plane. Accordingly, the incident light can be guided to the periphery of the image sensor 300 by about 1 inch due to the lens group (LG1, LG2) having different refractive powers and the difference in effective diameter of the lens surfaces.

The minimum difference in effective diameters of two adjacent lens surfaces within the first lens group (LG1) and the second lens group (LG2) may be 0.6 mm or less. Accordingly, the incident light can be refracted into the effective area between the first and second lens groups LG1 and LG2, and then refracted to the periphery of the image sensor 300.

The lens of the first lens group (LG1) may have positive (+) refractive power, and among the lenses of the second lens group (LG2), the lens closest to the sensor may have negative (-) refractive power. In the optical system 1000, the number of lenses with positive (+) refractive power may be greater than the number of lenses with negative (-) refractive power. In the second lens group LG2, the number of lenses with positive (+) refractive power may be equal to the number of lenses with negative (-) refractive power.

Within the optical system 1000, the sum of focal lengths of lenses with positive refractive power may be greater than the absolute value of the sum of focal distances of lenses with negative refractive power. Accordingly, resolution can be improved by using the refractive power and positive and negative focal lengths of each lens.

Each of the plurality of lenses may include an effective area and an uneffective area. The effective area may be an area through which light incident on each of the lenses passes. That is, the effective area may be an effective diameter or an area of an effective diameter in which the incident light is refracted to realize optical characteristics. The non-effective area may be arranged around the effective area. The end of the effective area can be defined as an edge or end. The non-effective area may be an area where effective light does not enter the plurality of lenses. That is, the non-effective area may be an area unrelated to the optical characteristics. Additionally, the end of the non-effective area may be an area fixed to a barrel (not shown) that accommodates the lens.

The optical system 1000 may include an image sensor 300. The image sensor 300 can detect light and convert it into an electrical signal. The image sensor 300 may detect light that sequentially passes through the plurality of lenses 100. The image sensor 300 may include an element capable of detecting incident light, such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The diagonal length of the image sensor 300 may be greater than 8 mm, for example, greater than 8 mm and less than 30 mm. Preferably, Imgh of the image sensor 300 may be smaller than TTL.

The optical system 1000 may include an optical filter 500. The optical filter 500 may be disposed between the second lens group LG2 and the image sensor 300. The optical filter 500 may be disposed between the image sensor 300 and a lens closest to the sensor among the plurality of lenses 100. For example, when the optical system 100 is an 8-element lens, the optical filter 500 may be disposed between the seventh lens 107, which is the last lens, and the image sensor 300.

The optical filter 500 may include an infrared filter. The optical filter 500 may pass light in a set wavelength band and filter light in a different wavelength band. When the optical filter 500 includes an infrared filter, radiant heat emitted from external light can be blocked from being transmitted to the image sensor 300. Additionally, the optical filter 500 can transmit visible light and reflect infrared rays. As another example, a cover glass may be further disposed between the optical filter 500 and the image sensor 300.

The optical system 1000 according to the embodiment may include an aperture stop. The aperture (Stop) may be a stopper that adjusts the amount of light incident on the optical system 1000. The aperture may be disposed around at least one lens among the lenses of the first and second lens groups LG1 and LG2. The aperture may be disposed around the lens of the first lens group LG1. For example, the aperture may be disposed around the object-side surface or sensor-side surface of the first lens 101, or may be disposed around the object-side surface or sensor-side surface of the second lens 102. Alternatively, at least one lens selected from among the plurality of lenses may function as an aperture.

As shown in FIG. 1, the aperture ST may be disposed on the object side rather than the object side surface of the first lens 101. 9 and 10, the aperture ST may be disposed around the object-side surface of the first lens 101. 17 and 18, the aperture ST may be disposed around the sensor side of the first lens 101. 23 and 24, the aperture ST may be disposed around the sensor side of the first lens 101.

The minimum distance from the aperture ST to the sensor-side surface of the n-th lens may be equal to or smaller than the optical axis distance from the object-side surface of the first lens 101 to the sensor-side surface of the n-th lens. The optical axis distance from the aperture (ST) to the sensor side of the nth lens is SD. Depending on the position of the aperture ST, the distance relationship between EFL, Imgh, and TTL may vary. The first and second embodiments may satisfy at least one or all of the conditions SD > EFL, SD > Imgh, and SD ≤ TTL, and the third and fourth embodiments may satisfy SD ≤ EFL, SD ≤ Imgh, and SD < TTL. At least one of these can be satisfied. Here, EFL is the effective focal length of the entire optical system and can be defined as F. The above condition of F < TTL can be satisfied. The difference between F and Imgh may be 2 mm or less, for example, 0.01 to 2 mm or 0.01 to 0.5 mm. The field of view (FOV) of the optical system 1000 may be less than 120 degrees, for example, more than 70 degrees and less than 100 degrees. The F number (F#) of the optical system 1000 may be greater than 1 but less than 10, for example, 1.1 ≤ F# ≤ 5. If it is 3 or less, a bright image can be provided. Additionally, the F# may be smaller than the entrance pupil size (EPD). Accordingly, the optical system 1000 has a slim size, can control incident light, and can have improved optical characteristics within the field of view.

The optical system 1000 according to the embodiment may further include a reflective member (not shown) to change the path of light. The reflective member may be implemented as a prism that reflects incident light from the first lens group LG1 in the direction of the lenses. Hereinafter, the optical system according to the embodiment will be described in detail.

In an embodiment of the invention, the lens unit 100 may include a first lens 101 to a seventh lens 107. The first to seventh lenses 101-107 may be sequentially aligned along the optical axis OA of the optical system 1000. Light corresponding to information on the object may pass through the first to seventh lenses 101 to 107 and the optical filter 500 and be incident on the image sensor 300.

The first lens group LG1 may include the first lens 101, and the second lens group LG2 may include the second to seventh lenses 102-107. The optical axis distance between the first lens 101 and the second lens 102 may be the optical axis distance between the first and second lens groups LG1 and LG2.

Among the first to seventh lenses 101-107, the number of lenses having a meniscus shape convex from the optical axis toward the object may be 2 or 3, and for example, n-4 of the total number of lenses may be satisfied. The n is the total number of lenses, and may be, for example, 7.

1, 2, 9, 16, and 24, when describing the optical system 1000 according to the first to fourth embodiments, the first lens 101 is positive (+) or negative at the optical axis OA. It may have a (-) refractive power, and preferably may have a positive (+) refractive power. The first lens 101 may include plastic or glass. For example, the first lens 101 may be made of plastic.

At the optical axis OA, the object-side first surface S1 of the first lens 101 may have a convex shape, and the sensor-side second surface S2 may have a concave shape. That is, the first lens 101 may have a meniscus shape that is convex from the optical axis OA toward the object. Since the first lens 101 has a meniscus shape that is convex toward the object, the amount of incident light can be improved. Alternatively, the first lens 101 may have a lens shape in which both sides are convex. At least one of the first surface (S1) and the second surface (S2) may be an aspherical surface. For example, both the first surface (S1) and the second surface (S2) may be aspherical. The aspherical coefficients of the first and second surfaces (S1, S2) are provided as shown in Figures 4, 11, 18, and 25, where L1 is the first lens 101, L1S1 is the first surface, and L1S2 is the second surface. am.

The second lens 102 may have positive (+) or negative (-) refractive power at the optical axis (OA). The second lens 102 may have negative (-) refractive power. The second lens 102 may include plastic or glass. For example, the second lens 102 may be made of plastic.

At the optical axis OA, the object-side third surface S3 of the second lens 102 may have a convex shape, and the sensor-side fourth surface S4 may have a concave shape. That is, the second lens 102 may have a meniscus shape that is convex from the optical axis OA toward the object. Differently, at the optical axis OA, the third surface S3 may have a convex shape, and the fourth surface S4 may have a convex shape.

At least one of the third surface S3 and the fourth surface S4 may be an aspherical surface. For example, both the third surface S3 and the fourth surface S4 may be aspherical. The aspheric coefficients of the third and fourth surfaces (S3, S4) are provided as shown in Figures 4, 11, 18, and 25, where L2 is the second lens 102, L2S1 is the third surface, and L2S2 is the fourth surface. am.

At least one of the third surface S3 and the fourth surface S4 of the second lens 102 may have a critical point from the optical axis OA to the end of the effective area. For example, the third surface S3 may have a critical point at a position of 50% or more of the effective radius from the optical axis OA, and the critical point of the third surface S3 may be, for example, 55% to 55% of the effective radius based on the optical axis. It can be located in the 75% range. The fourth surface S4 may be provided without a critical point from the optical axis to the end of the effective area, or the critical point of the fourth surface S4 may be located at a position greater than 84% of the effective radius from the optical axis OA. The critical point may be a point where the slope value of a tangent line passing through the lens surface increases and then decreases, or a point where it decreases and then increases.

The third lens 103 may have positive (+) or negative (-) refractive power at the optical axis OA, and may preferably have positive (+) refractive power. The third lens 103 may include plastic or glass. For example, the third lens 103 may be made of plastic.

At the optical axis OA, the object-side fifth surface S5 of the third lens 103 may have a convex shape, and the sensor-side sixth surface S6 may have a convex shape. That is, the third lens 103 may have a shape in which both sides are convex at the optical axis OA. When the third lens 103 has a shape in which both sides are convex, the TTL of the lens and the number of lenses can be reduced and light can be refracted efficiently. With respect to the radius of curvature R5 of the fifth surface S5 and the radius of curvature R6 of the sixth surface S6, if the condition R5 > R6 is satisfied, light is emitted from the sensor side of the third lens 103. It can be refracted efficiently, the effective diameters of the fourth to seventh lenses 104-107 can be guided so as not to increase, and the TTL can be reduced. If the condition is R6 > R5, a lot of aberration occurs on the object side of the third lens 103, and the refractive power of light is low on the sensor side of the third lens, so the effective diameter and TTL of the fourth to seventh lenses This can get bigger.

Alternatively, the third lens 103 may have a meniscus shape that is convex toward the sensor. Differently, at the optical axis OA, the fifth surface S5 may have a concave shape, and the sixth surface S6 may have a concave shape. Alternatively, the third lens 103 may have a meniscus shape that is convex toward the object.

The fifth surface S5 and the sixth surface S6 of the third lens 103 may be provided without a critical point from the optical axis OA to the end of the effective area. At least one of the fifth surface S5 and the sixth surface S6 may be an aspherical surface. For example, both the fifth surface S5 and the sixth surface S6 may be aspherical. The aspherical coefficients of the fifth and sixth surfaces (S5, S6) are provided as shown in Figures 4, 11, 18, and 25, where L3 is the third lens 103, L3S1 is the fifth surface, and L3S2 is the sixth surface. am.

The fourth lens 104 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fourth lens 104 may have negative refractive power. The fourth lens 104 may include plastic or glass. For example, the fourth lens 104 may be made of plastic.

At the optical axis OA, the object-side seventh surface S7 of the fourth lens 104 may have a concave shape, and the sensor-side eighth surface S8 may have a convex shape. That is, the fourth lens 104 may have a meniscus shape that is convex from the optical axis OA toward the sensor. Alternatively, the fourth lens 104 may have a meniscus shape that is convex from the optical axis toward the object. Alternatively, the fourth lens 104 may have a concave shape on both sides. Alternatively, the fourth lens 104 may have a convex shape on both sides. At least one of the seventh surface S7 and the eighth surface S8 may be an aspherical surface. For example, both the seventh surface (S7) and the eighth surface (S8) may be aspherical, the aspherical coefficients are provided as shown in FIGS. 4, 11, 18, and 25, and L4 is the fourth lens 104. , L4S1 is the 7th side, and L4S2 is the 8th side.

The fourth lens 104 according to the first and second embodiments may have a critical point on at least one or both of the seventh surface S7 and the eighth surface S8. For example, the eighth surface S8 may have a critical point. The seventh surface S7 may have a critical point located around an edge or may be provided without a critical point. In the first and second embodiments, the critical point of the seventh surface S7 may be located at a distance of 86% or more of the effective radius based on the optical axis OA, for example, in the range of 86% to 100%. Accordingly, the TTL can be reduced by changing the refraction angle of light around the critical point of the seventh surface S7. At least one or both of the seventh surface S7 and the eighth surface S8 of the fourth lens 104 according to the third and fourth embodiments may be provided without a critical point.

Since the first to fourth lenses 101-104 alternately arrange lenses with opposite refractive powers, chromatic aberrations generated in each lens can be mutually corrected.

The maximum Sag value of the object-side seventh surface S7 of the fourth lens 104 may be smaller than the central thickness of the fourth lens 104 in absolute value. The maximum Sag value of the eighth surface S8 on the sensor side of the fourth lens 104 may be smaller than the central thickness of the fourth lens 104 in absolute terms. Here, the Sag value is the distance in the optical axis direction from the center of each lens surface to the lens surface based on a straight line perpendicular to the optical axis. If the Sag value has a positive value, it is located closer to the sensor than the center of each lens surface. , if the Sag value has a negative value, it may be located closer to the object than the center of each lens surface. Due to the Sag value, the lens surface of the fourth lens 104 may have a change less than the central thickness of the fourth lens 104 from the optical axis OA to the edge. Additionally, the optical axis spacing between the fourth and fifth lenses 104 and 105 can be increased by the Sag value of the fourth lens 104, and the Sag value of the fifth lens 105 can be further increased.

The fifth lens 105 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fifth lens 105 may have positive refractive power. The fifth lens 105 may include plastic or glass. For example, the fifth lens 105 may be made of plastic.

At the optical axis OA, the object-side ninth surface S9 of the fifth lens 105 may have a convex shape, and the sensor-side tenth surface S10 may have a convex shape. That is, the fifth lens 105 may have a shape in which both sides are convex at the optical axis OA.

When the fifth lens 105 has a shape in which both sides are convex, the TTL of the lens and the number of lenses can be reduced and light can be refracted efficiently. When the radius of curvature of the ninth surface (S9) is R9 and the radius of curvature of the tenth surface (S10) is R10, if the condition of R9 > R10 is satisfied, light is efficiently transmitted from the sensor side of the fifth lens 105. Light can be refracted, light can be guided so that the effective diameters of the sixth and seventh lenses 106 and 107 are not increased, and TTL can be reduced. If the condition is R10 > R9, a lot of aberration occurs on the object side of the fifth lens 105, and the refractive power of light is low on the sensor side of the fifth lens, so the effective diameter and TTL of the sixth and seventh lenses are lowered. It can get bigger.

Alternatively, the fifth lens 105 may have a meniscus shape that is convex toward the object. Alternatively, the fifth lens 105 may have a concave shape on both sides. Alternatively, the fifth lens 105 may have a meniscus shape that is convex from the optical axis OA toward the sensor.

At least one of the ninth surface S9 and the tenth surface S10 of the fifth lens 105 may be an aspherical surface. For example, the ninth surface (S9) and the tenth surface (S10) may both be aspherical, the aspherical coefficients are provided as shown in FIGS. 4, 11, 18, and 25, and L5 is the fifth lens 105. , L5S1 is the 9th side, and L5S2 is the 10th side.

At least one or both of the ninth surface S9 and the tenth surface S10 of the fifth lens 105 may have a critical point. For example, the critical point of the ninth surface S9 may be located at a distance of 54% or less of the effective radius based on the optical axis OA, for example, in the range of 34% to 54%, or in the range of 39% to 49%. . The tenth surface S10 may be provided without critical points from the optical axis OA to the end of the effective area, or may have critical points around the edges. The critical point of the object-side surface of the fifth lens 105 may be located closer to the optical axis OA than the critical point of the eighth surface S8 of the fourth lens 104 based on the optical axis. Accordingly, the fifth lens 105 can refract the light emitted from the fourth lens 104 around the critical point of the ninth surface S9, thereby improving the optical performance of the center of the image sensor 300. I can give it.

The sixth lens 106 may have positive (+) or negative (-) refractive power at the optical axis (OA). The sixth lens 106 is the n-1th lens and may have a refractive power different from the nth lens, for example, a positive refractive power. The sixth lens 106 may include plastic or glass. For example, the sixth lens 106 may be made of plastic. The focal length (absolute value) of the fourth lens 104 or the sixth lens 106 may be the largest within the lens unit 100.

At the optical axis OA, the object-side 11th surface S11 of the sixth lens 106 may have a convex shape, and the sensor-side 12th surface S12 may have a concave shape. That is, the sixth lens 106 may have a meniscus shape that is convex from the optical axis OA toward the object. Alternatively, the sixth lens 106 may have a concave shape on both sides. Alternatively, the sixth lens 106 may have a meniscus shape that is convex toward the sensor. Alternatively, the sixth lens 106 may have a convex shape on both sides. At least one of the 11th surface (S11) and the 12th surface (S12) may be an aspherical surface. For example, the 11th surface (S11) and the 12th surface (S12) may both be aspherical, the aspherical coefficients are provided as shown in FIGS. 4, 11, 18, and 25, and L6 is the sixth lens 106. , L6S1 is the 11th side, and L6S2 is the 12th side.

As shown in FIG. 2 , at least one or both of the 11th and 12th surfaces S11 and S12 of the sixth lens 106 may have a critical point. For example, the first critical point P1 of the eleventh surface S11 is located at a distance of less than 63% of the effective radius based on the optical axis OA, for example, in the range of 18% to 63%, or in the first to third embodiments Examples may be located in the 46% to 56% range and fourth embodiments may be located in the 18% to 38% range. The second critical point P2 of the fourteenth surface S14 is located at a distance of 58% or less of the effective radius r62 based on the optical axis OA, for example, in the range of 38% to 58%, or 43% to 53%. It can be located within the range. In the first to third embodiments, the second critical point P2 and the first critical point P1 may be located at the same distance from the optical axis OA or may have a separation distance of 0.2 mm or less. Accordingly, the 12th surface (S12) can refract the light incident on the 11th surface (S11) based on the second critical point (P2) in the optical axis (OA) direction and the edge direction, thereby reducing the TTL. .

Here, the critical points (P1, P2) are the optical axis (OA) and the sign of the slope value with respect to the direction perpendicular to the optical axis (OA) is from positive (+) to negative (-) or from negative (-) to positive (+ ), which may mean a point where the slope value is 0. Additionally, the critical point may be a point where the slope value of a tangent line passing through the lens surface increases and then decreases, or a point where it decreases and then increases.

The seventh lens 107 may have positive (+) or negative (-) refractive power at the optical axis (OA). The seventh lens 107 is the nth lens and may have negative (-) refractive power. The seventh lens 107 may include plastic or glass. For example, the seventh lens 107 may be made of plastic.

At the optical axis OA, the object-side 13th surface S13 of the seventh lens 107 may have a concave shape, and the sensor-side 14th surface S14 may have a convex shape. That is, the seventh lens 107 may have a meniscus shape that is convex from the optical axis OA toward the sensor. Alternatively, the seventh lens 107 may have a meniscus shape that is convex toward the object. Alternatively, the seventh lens 107 may have a shape with both sides concave or both sides convex at the optical axis OA. At least one of the 13th surface (S13) and the 14th surface (S14) may be an aspherical surface. For example, the 13th surface (S13) and the 14th surface (S14) may both be aspherical, the aspherical coefficients are provided as shown in FIGS. 4, 11, 18, and 25, and L7 is the seventh lens 107. , L7S1 is the 13th side, and L7S2 is the 14th side.

As shown in FIG. 2 , at least one of the 13th and 14th surfaces S13 and S14 of the seventh lens 107 may have a critical point. For example, the third critical point P3 of the 13th surface S13 is located at a distance of 74% or more of the effective radius based on the optical axis OA, for example, in the range of 74% to 100%, or in the range of 80% to 99%. can be located The fourteenth surface S14 may be provided without a critical point within the effective radius r72 at the optical axis OA. Accordingly, when the 14th surface S14 is provided without a critical point, the back focal length (BFL) can be reduced and the overall length, TTL, can be reduced. The BFL is the optical axis distance from the center of the 14th surface S14 to the top surface of the image sensor 300.

The positions of the critical points P1, P2, and P3 of the sixth and seventh lenses 106 and 107 are preferably located at positions that satisfy the above-mentioned range in consideration of the optical characteristics of the optical system 1000. In detail, it is desirable that the position of the critical point satisfies the above-mentioned range for controlling optical characteristics such as chromatic aberration, distortion characteristics, aberration characteristics, and resolution of the optical system 1000. Accordingly, the path of light emitted to the image sensor 300 through the lens can be effectively controlled. Accordingly, the optical system 1000 according to the embodiment may have improved optical characteristics even in the center and peripheral areas of the field of view (FOV).

As shown in FIG. 2, the distance from the optical axis OA to the ends of the effective areas of each of the 11th surface S11 and the 12th surface S12 of the sixth lens 106 is the effective radius, which is defined as r61 and r62. You can. The distance from the optical axis OA to the ends of the effective areas of each of the 13th surface S13 and the 14th surface S14 of the seventh lens 107 is the effective radius, and can be defined as r71 and r72.

The distance from the optical axis OA to the critical points P1, P2, and P3 of the 11th, 12th, and 13th (S11, S12, and S13) can be defined as follows.

Inf61: Straight line distance from the center of the 11th surface (S11) to the first critical point (P1)

Inf62: Straight line distance from the center of the 12th surface (S12) to the second critical point (P2)

Inf71: Straight line distance from the center of the 13th surface (S13) to the 3rd critical point (P3)

The distance from the center of each lens surface to the critical point may have the following relationship.

Inf61 < Inf71

Inf62 < Inf71

The effective radii (r61, r62, r71) and the distances (Inf61, Inf62, Inf71) to the critical points (P1, P2, P3) from the optical axis may satisfy the following relational equation.

0.186 ≤ Inf61/r61 ≤ 0.612

0.377 ≤ Inf62/r62 ≤ 0.600

0.744 ≤ Inf71/r71 ≤ 0.970

The positions of the first and second critical points (P1, P2) may be located at a position of 2.6 mm or less from the optical axis (OA), for example, within a range of 1 mm to 2.6 mm, and the third critical point (P3) may be located at a position of 2.6 mm or less from the optical axis (OA). It can be located above 4.9 mm.

The third critical point P3 may be located closer to the edge than the first and second critical points P1 and P2, and thus the light emitted through the outer portion of the sixth lens 106 is transmitted to the image sensor 300. ) can be refracted into the surrounding area.

The normal line K2, which is a straight line perpendicular to the tangent line K1 passing through an arbitrary point of the sensor-side 14th surface S14 of the seventh lens 107, has a first angle θ1 with respect to the optical axis OA. When the first angle θ1 is maximum, it may be greater than 5 degrees and less than 65 degrees, for example, in the range of 30 degrees to 60 degrees or 30 degrees to 55 degrees. Accordingly, by providing a large Sag value toward the object based on a straight line perpendicular to the optical axis OA of the 14th surface S14, the TTL can be reduced and the size of the image sensor 300 can be increased.

The angle between the optical axis and the normal line K4 perpendicular to the tangent K3 passing through the twelfth surface S12 of the sixth lens 106 has a second angle θ2, and the second angle θ2 is At maximum, it may be more than 30 degrees and less than 80 degrees, for example in the range of 55 degrees to 75 degrees or in the range of 55 degrees to 70 degrees. Accordingly, by providing a large Sag value toward the object based on a straight line perpendicular to the optical axis OA of the twelfth surface S12, the TTL can be reduced and the size of the image sensor 300 can be increased.

The maximum angle between the normal line passing through the 13th surface (S13) of the seventh lens 107 and the optical axis is θ3, and the angle perpendicular to the tangent line passing through the 11th surface (S11) of the sixth lens 106 The maximum angle between a normal line and the optical axis is θ4, and when θ1 and θ2 are maximum angles, at least one of the following conditions can be satisfied.

Condition 1: θ1 < θ2

Condition 2: θ3 < θ4

Condition 3: θ3 < θ1

Condition 4: 1 < θ1- θ3 < 10

Condition 5: 15 < θ2 - θ1 < 30

Condition 6: 22 < θ4 - θ3 < 42

Condition 7: (θ2-θ1) < (θ4-θ3)

On the optical axis,

The curvature radii of the first and second surfaces (S1 and S2) of the first lens 101 are L1R1 and L1R2,

The curvature radii of the third and fourth surfaces S3 and S4 of the second lens 102 are L2R1 and L2R2,

The curvature radii of the fifth and sixth surfaces (S5, S6) of the third lens 103 are L3R1 and L3R2,

The curvature radii of the seventh and eighth surfaces (S7 and S8) of the fourth lens 104 are L4R1 and L4R2,

The curvature radii of the 9th and 10th surfaces (S9, S10) of the fifth lens 105 are L5R1 and L5R2,

The curvature radii of the 11th and 12th surfaces (S11 and S12) of the sixth lens 106 are L6R1 and L6R2.

The radii of curvature of the 13th and 14th surfaces S13 and S14 of the seventh lens 107 can be defined as L7R1 and L7R2. The radii of curvature may satisfy at least one of the following conditions to improve the aberration characteristics of the optical system.

Condition 1: (L2R1-L2R2) < L1R1 < L1R2

Condition 2: L2R1+L2R2 < L3R1

Condition 3: L1R1+L1R2 < L3R1 <｜L3R2｜

Condition 4: ｜L4R1｜*2 < ｜L4R2｜

Condition 5: L5R1+｜L5R2｜ > ｜L4R2｜

Condition 6: L6R1*L6R2 < L5R1

Condition 7: ｜L7R1｜*｜L7R2｜ <｜L4R2｜ (However, the relationship L7R1, L7R2 > 0 is satisfied)

Condition 8: L7R1*L7R2 < L1R1*L1R2

The average of the radii of curvature of the 11th and 12th surfaces (S11 and S12) of the sixth lens 106 at the optical axis (OA) may be the minimum in the optical system, and the radii of curvature of the 11th and 12th surfaces (S11 and S12) of the sixth lens 106 may be the minimum in the optical system. The difference may be less than 2 mm. The average of the radii of curvature (absolute value) of the 9th and 10th surfaces S9 and S10 of the fifth lens 105 may be the maximum within the optical system 1000. By setting the radius of curvature of each lens, good optical performance can be provided at the focal length of each lens.

The effective diameters of the first to seventh lenses 101-107 can be defined as CA1-CA8. The effective diameter CA7 of the seventh lens 107 may have a maximum effective diameter and may be 8 mm or more. Each effective diameter is the average of the effective diameters of the object side and the sensor side. The effective diameter CA7 of the seventh lens 107 may be more than twice the radius of curvature of the object-side surface S1 of the first lens 101.

On the optical axis,

The effective diameters of the first and second surfaces (S1 and S2) of the first lens 101 are CA11 and CA12,

The effective diameters of the third and fourth surfaces (S3 and S4) of the second lens 102 are CA21 and CA22,

The effective diameters of the fifth and sixth surfaces (S5, S6) of the third lens 103 are CA31 and CA32,

The effective diameters of the seventh and eighth surfaces (S7 and S8) of the fourth lens 104 are CA41 and CA42,

The effective diameters of the 9th and 10th surfaces (S9, S10) of the fifth lens 105 are CA51 and CA52,

The effective diameters of the 11th and 12th surfaces (S11 and S12) of the sixth lens 106 are CA61 and CA62,

The effective diameters of the 13th and 14th surfaces (S13 and S14) of the seventh lens 107 can be defined as CA71 and CA72. These effective diameters are factors that affect the aberration characteristics of the optical system, and can satisfy at least one of the following conditions.

Condition 1: CA22 < CA12 < CA11

Condition 2: CA2 < CA3 < CA4 < CA5 < CA6 < CA7

Condition 3: C22 < CA31 < CA41 < CA51 < CA61

Condition 4: ｜CA21-CA22｜ < CA11-CA12

Condition 5: CA41 + CA42 < CA72

Condition 6: ｜L7R1+L7R2｜ < CA72

Among the first to seventh lenses 101-107, the average effective diameter of the lenses may be the smallest for the second lens 102 and the largest for the seventh lens 107. The effective diameter of the third surface S3 or the fourth surface S5 may be the minimum, and the effective diameter of the fourteenth surface S14 may be the largest. The size of the effective diameter of the seventh lens 107 is the largest, so that it can effectively refract incident light toward the image sensor 300. Accordingly, the optical system 1000 can have improved chromatic aberration control characteristics, and the vignetting characteristics of the optical system 1000 can be improved by controlling incident light.

In the optical system, the number of lenses with a refractive index exceeding 1.6 may be 2 or less, and may be smaller than the number of lenses with a refractive index of less than 1.6. In the optical system, the number of lenses less than 1.6 may be 3 or more or 4 or more. The average refractive index of the first to seventh lenses 101-107 may be 1.50 or more. In the optical system, the number of lenses with an Abbe number greater than 45 may be greater than the number of lenses with an Abbe number of less than 45, for example, more than 3 lenses. The average Abbe number of the first to seventh lenses 101-107 may be 45 or less. By setting the refractive index and Abbe number of each lens, the effect of chromatic aberration can be controlled.

Referring to FIG. 2, back focal length (BFL) is the optical axis distance from the image sensor 300 to the sensor side of the last lens. That is, BFL is the optical axis distance between the image sensor 300 and the 14th sensor-side surface S14 of the seventh lens 107. CT6 is the center thickness or optical axis thickness of the sixth lens 106, and ET6 is the end or edge thickness of the effective area of the sixth lens 106. CT7 is the central thickness or optical axis thickness of the seventh lens 107. CG6 is the optical axis spacing between the sixth lens 106 and the seventh lens 107. That is, the optical axis gap CG6 between the sixth lens 106 and the seventh lens 107 is the distance between the 12th surface S12 and the 13th surface S13 on the optical axis OA. In this way, the center thickness of the first to seventh lenses 107 can be defined as CT1 to CT7, and the center spacing between the first to seventh lenses can be defined as CG1 to CG6. . Additionally, the edge thickness of each lens can be defined as ET1 to ET7, and the edge spacing between adjacent lenses can be defined as EG1 to EG6. Here, the edge thickness and edge spacing may be the distance in the optical axis direction between effective areas of each lens.

The CG6 may be larger than the optical axis gap CG1 between the first and second lenses 101 and 102. The CG6 may be greater than the sum of the center thicknesses (CT5 and CT6) of the fifth and sixth lenses (105 and 106). The CG6 may be the largest among the optical axis gaps between two adjacent lenses. The CG6 may be 13% or more of the optical axis distance from the first surface (S1) of the first lens 101 to the 14th surface (S14) of the seventh lens 107, for example, in the range of 13% to 23%. there is. Among the first to seventh lenses 101-107, the lens having the maximum central thickness is one of the 5th and 6th lenses 105 and 106. The center thickness (CT1) of the first lens 101 may be smaller than the optical axis gap (CG6) between the sixth and seventh lenses (106, 107) and may satisfy the condition of CT1 < CG6. A slim optical system with improved optical performance can be provided by the central thickness of the first lens 101 and the optical axis gap CG6 between the sixth and seventh lenses 106 and 107.

The optical axis gap CG6 between the sixth and seventh lenses 106 and 107 may be greater than the sum of the center thicknesses of the four relatively small lenses among the center thicknesses of all lenses.

Additionally, the condition of the equation: CT2 < CG1 can be satisfied. Accordingly, by increasing the center distance (CG1) between the first and second lenses (101, 102) larger than the center thickness (CT2) of the second lens (102), the average effective diameter (CA2, CA3) can be set to be smaller than the average effective diameter (CA1) of the first lens 101. Additionally, the condition of the equation: CA2-CA3 < CA1-CA2 can be satisfied.

The center spacing (CG6) between the sixth lens 106 and the seventh lens 107 is the largest among the center spacings between lenses, and the optical axis spacing (CG2) between the second and third lenses (102 and 103) is It is the minimum center spacing between lenses. The lens having the minimum central thickness may be one of the second and seventh lenses 102 and 107, for example, the second lens 102.

Among the lenses 101-107, the maximum central thickness may be 4 times or less, for example, 2 to 4 times the minimum central thickness. Among the lenses, the number of lenses with a center thickness of less than 0.5 mm may be smaller than the number of lenses with a center thickness of 0.5 mm or more, and may be more than 3. The average central thickness of the lenses may be greater than 0.5 mm. The optical system 1000 having an image sensor 300 with a size of about 1 inch can be provided in a structure with a slim thickness.

The sum of the central thicknesses of the first to seventh lenses 101-107 may be smaller than the sum of the center spacings between the first to seventh lenses 101-107. The difference between the sum of the center thicknesses of the first to seventh lenses 101-107 and the sum of the center spacings between the first to seventh lenses 101-107 may be greater than 0.5 mm. Accordingly, the optical system 1000 can control incident light and have improved aberration characteristics and resolution.

When defining the focal length of each lens (101-107) as F1, F2, F3, F4, F5, F6, F7, the conditions F1 < F3 and F3 < F6 can be satisfied in absolute values, and F7 < F5 < The conditions of F6 can be satisfied. By adjusting this focal distance, resolution can be affected. If the focal length is described as an absolute value, the absolute value of the focal length (F4, F6) of any one of the fourth and sixth lenses (104, 106) may be the largest among the lenses, and the focal length of the seventh lens (107) may be the largest among the lenses. (absolute value) is the minimum. The maximum focus distance may be 2 to 10 times the minimum focus distance.

The refractive indices of each lens 101-107 are n1, n2, n3, n4, n5, n6, and n7, and the Abbe numbers of each lens 101-107 are v1, v2, v3, v4, v5, v6, and v7. In this case, the refractive index may satisfy the condition n1 < n2, n1, n3, n5, and n7 may be less than 1.6 and have a difference of less than 0.2 from each other, and n2, n4, and n6 may be greater than 1.60. Abbe's number can satisfy the condition v2 < v1, v1, v3, v5, and v7 can be 45 or more and have a difference of 10 or less from each other, and v2, v4, v6 can be less than 45, for example, 30 or less, and can be different from each other. The liver may have a difference of less than 10. Accordingly, the optical system 1000 may have improved chromatic aberration control characteristics. Preferably, the condition v1*n1 > v2*n2 can be satisfied.

The optical system 1000 according to the embodiment disclosed above may satisfy at least one or two of the equations described below. Accordingly, the optical system 1000 according to the embodiment may have improved optical characteristics. For example, if the optical system 1000 satisfies at least one mathematical equation, the optical system 1000 can effectively control aberration characteristics such as chromatic aberration and distortion aberration, not only in the center but also in the periphery of the field of view (FOV). It can have good optical performance. The optical system 1000 may have improved resolution and may have a slimmer and more compact structure.

Hereinafter, the center thickness of the first to seventh lenses 101-107 may be defined as CT1-CT7, the edge thickness may be defined as ET1-ET7, and the optical axis spacing between two adjacent lenses may be defined as the first and second lenses. From the gap between lenses to the gap between the 6th and 7th lenses, it can be defined as CG1-CG6, and the edge gap between two adjacent lenses can be defined as EG1-CG6, from the gap between the 1st and 2nd lenses to the gap between the 6th and 7th lenses. It can be defined as EG7. The effective diameters of the first to seventh lenses 101-107 can be defined as CA1-CA7, starting from the effective diameters of the object-side and sensor-side surfaces of the first lens 101 to the object-side surface of the seventh lens 107. And the effective diameters on the sensor side can be defined as CA11, CA12 to CA71, CA72. The units of the thickness, spacing, effective diameter, and Sag values are mm.

[Equation 1]

1 < CT1 / CT2 < 5

In Equation 1, if the center thickness (CT1) of the first lens 101 and the center thickness (CT2) of the second lens 102 are satisfied, the optical system 1000 can improve aberration characteristics. Preferably, Equation 1 may satisfy 2 < CT1 / CT2 < 3.2.

[Equation 2]

0 < CT2 / ET2 < 1

In Equation 2, if the center thickness (CT2) and the edge thickness (ET2) of the second lens 102 are satisfied, the optical system 1000 may have improved chromatic aberration control characteristics. Preferably, Equation 2 may satisfy 0.3 < CT2 / ET2 < 0.8.

Equation 2-1] 1 < CT1 / ET1 < 5

[Equation 2-2] 1 < CT3 / ET3 < 5

[Equation 2-3] (CT2 + CT4) < CT1

[Equation 2-4] 0.5 < CT4 / ET4 < 1.5

[Equation 2-5] 1 < CT5 / ET5 < 3

[Equation 2-6] 2 < CT6 / ET6 < 8

[Equation 2-7] 0 < CT7 / ET7 < 1

[Equation 2-8] CT2+CT3+CT4+CT7 < CT5+CT6

[Equation 2-9] 0.5 < SD / TD ≤ 1

In Equations 2-1 to 2-8, the center thickness (CT2, CT3, CT4, CT5, CT6, CT7) and edge thickness (ET2, ET3, ET4, ET5, When the ratio of ET6, ET7) is satisfied, the optical system 1000 can have improved chromatic aberration control characteristics.

The SD is the optical axis distance from the aperture to the sensor-side 14th surface (S14) of the seventh lens 107, and the TD is the optical axis distance from the object-side first surface (S1) of the first lens 101 to the seventh lens 107. It is the optical axis distance to the 14th surface (S14) on the sensor side of (107). The aperture may be disposed around the perimeter of the object-side surface or the sensor-side surface of the first lens 101. When the optical system 1000 according to the embodiment satisfies Equation 2-9, the chromatic aberration of the optical system 1000 can be improved.

[Equation 2-10]

0 < F_LG1/｜F_LG2｜ < 1

F_LG1 is the focal length of the first lens group (LG1), and F_LG2 is the focal length of the second lens group (LG2). The first lens group LG1 may include a first lens 101, and the second lens group LG2 may include second to seventh lenses 102-107. When the optical system 1000 according to the embodiment satisfies Equation 2-10, the chromatic aberration of the optical system 1000 may be improved. That is, as the value of Equation 2-10 approaches 1, the distortion aberration can be reduced. Preferably, the condition 0 < | F_LG1-F_LG2 | < 0.5 may be satisfied.

[Equation 3]

CT2 + CT3 + CT4 < CG6

In Equation 3, if the sum of the center thicknesses (CT2, CT3, CT4) of the second, third, and fourth lenses (102, 103, and 104) and the optical axis spacing (CG6) between the sixth and seventh lenses (106 and 107) are satisfied, the optical system ( 1000) may have improved chromatic aberration control characteristics. Preferably, the condition CT1 < CG5 < CG6 can be satisfied.

[Equation 3-1]

CT2+CT3+CT4+CT5+CT6 < CG5+CG6

In Equation 3-1, the sum of the center thicknesses (CT2-CT6) of the second to sixth lenses (102, 103, 104, 105, 106) is equal to the optical axis spacing (CG5) between the fifth and sixth lenses (105, 106) and the 6th and 7th lenses (106, 107). If it is smaller than the sum of the optical axis spacing (CG6) between the optical axes, the optical system 1000 may have improved chromatic aberration control characteristics. Additionally, by reducing the thickness of each lens, a slim optical system can be provided.

[Equation 3-2]

CT4+CT5+CT6+CT7 < CG5+CG6

In Equation 3-2, the sum of the center thicknesses of the fourth to seventh lenses is equal to the optical axis spacing (CG5) between the fifth and sixth lenses (105 and 106) and the optical axis spacing (CG6) between the sixth and seventh lenses (106 and 107). If it is less than the sum, the optical system 1000 may have improved chromatic aberration control characteristics. Additionally, by reducing the thickness of each lens, a slim optical system can be provided.

That is, the sum of CG5 and CG6 may be greater than the sum of the center thicknesses of 50% of all lenses, or greater than the sum of the center thicknesses from the first to the fourth lens. Additionally, CG5 and CG6 may be greater than the sum of the center thicknesses from the nth lens to the n-3th lens.

The CG6 may be larger than the sum of the central thicknesses of four lenses with smaller central thicknesses among all lenses. Additionally, the sum of CG5 and CG6 may be greater than the sum of the center thicknesses of the four lenses with the largest center thickness among all lenses.

[Equation 4]

1.60 < n2

In Equation 4, n2 means the refractive index at the d-line of the second lens 102. When the optical system 1000 according to the embodiment satisfies Equation 4, the optical system 1000 can improve chromatic aberration characteristics.

[Equation 4-1]

1.50 < n1 < 1.60

1.50 < n3 < 1.60

1.50 < n5 < 1.60

1.60 < n6 < 1.75

In Equation 4-1, n1, n3, n5, and n6 are the refractive indices at the d-line of the first, third, fifth, and sixth lenses (101, 103, 105, and 106). When the optical system 1000 according to the embodiment satisfies Equation 4-1, the influence on the TTL of the optical system 1000 can be suppressed.

[Equation 4-2]

0.05 < n6-n7 < 0.2

0.05 < n4-n5 < 0.2

In Equation 4-2, n4, n5, n6, and n7 are the refractive indices at the d-line of the 4th, 5th, 6th, and 7th lenses (104, 105, 106, and 107). When the optical system 1000 according to the embodiment satisfies Equation 4-2, the optical system 1000 can improve chromatic aberration characteristics.

[Equation 5]

0.5 < Max_Sag72 to Sensor < 1.5

In Equation 5, Max_Sag72 to Sensor means the distance in the optical axis direction from the maximum Sag value of the 14th surface (S14) on the sensor side of the seventh lens 107 to the image sensor 300. For example, Max_Sag72 to Sensor has the maximum Sag value at the center of the sensor side of the seventh lens 107 and may be 0. When the optical system 1000 according to the embodiment satisfies Equation 5, the optical system 1000 has an optical filter 500 that can be disposed between the lens units 100, 100A, 100B, and 100C and the image sensor 300. Space can be secured, allowing for improved assembling. When the optical system 1000 satisfies Equation 5, the optical system 1000 can secure a gap for module manufacturing. Preferably, the value of Equation 5 may satisfy 0.8 < Max_Sag72 to Sensor < 1.2.

In the lens data for the embodiment, the position of the filter 500, the detailed distance between the last lens and the filter 500, and the distance between the image sensor 300 and the filter 500 are set for convenience in designing the optical system 1000. This is the position, and the filter 500 can be freely placed within a range that does not contact the last lens and the image sensor 300. Accordingly, the value of Max_Sag72 to Sensor in the lens data may be equal to the BFL (Back focal length) of the optical system 1000, and the position of the filter 500 is not in contact with the last lens and the image sensor 300, respectively. Good optical performance can be achieved by moving within a range that is not restricted.

[Equation 6]

0.8 < BFL / Max_Sag72 to Sensor < 1.2

In Equation 6, back focal length (BFL) refers to the distance (mm) on the optical axis (OA) from the center of the 14th surface (S14) of the seventh lens 107 to the upper surface of the image sensor 300. do. When the optical system 1000 according to the embodiment satisfies Equation 6, the optical system 1000 can improve distortion aberration characteristics and have good optical performance in the peripheral area of the field of view (FOV). In Equation 6, BFL and Max_Sag72 to Sensor may be the same.

[Equation 7]

5 < |Max slope72| < 65

In Equation 7, Max slope72 means the maximum angle (Degree) between the optical axis and the normal line perpendicular to the tangent measured on the 14th surface (S14) on the sensor side of the seventh lens 107. In detail, Max slope72 on the 14th surface (S14) is the angle (θ1) between the optical axis (OA) and the normal line (K2, Figure 2) perpendicular to the tangent (K1) passing through an arbitrary point of the 14th surface (S14). ) means the maximum value. When the optical system 1000 according to the embodiment satisfies Equation 7, the optical system 1000 can control the occurrence of lens flare. Preferably, equation 7 is 30 ≤ |Max slope72| ≤ 55 can be satisfied.

[Equation 7-1]

30 < |Max slope62| < 80

In Equation 7-1, Max slope62 means the maximum angle (Degree) between the optical axis and the normal line perpendicular to the tangent measured on the twelfth surface (S12) on the sensor side of the sixth lens 106. In detail, Max slope62 on the twelfth surface (S12) is the angle (θ2) between the optical axis (OA) and the normal line (K4, Figure 2) perpendicular to the tangent (K3) passing through an arbitrary point of the twelfth surface (S14). ) means the maximum value. When the optical system 1000 according to the embodiment satisfies Equation 7-1, the optical system 1000 can control the occurrence of lens flare. Preferably, equation 7 is 55 ≤ |Max slope62| ≤ 75 can be satisfied. Preferably, |Max slope72| The condition of < |Max slope62| can be satisfied.

[Equation 8]

CG5 < |Max_Sag62| < CG6

In Equation 8, Max_Sag62 is the maximum distance from the straight line extending in the direction (X, Y) perpendicular to the center of the sensor side of the sixth lens 106 to the twelfth surface (S12) in the object side direction. If it is a positive value, it is located closer to the sensor than the extending straight line, and if it is a negative value, it is located closer to the object than the extending straight line. If Equation 8 is satisfied, the optical system 1000 may have the outer portion of the sixth lens 106 disposed around the center gap CG5 between the fifth and sixth lenses 105 and 106. Accordingly, the effective diameter of the sixth lens 106 may have the largest difference from the effective diameter of the seventh lens 107, and the incident light may be refracted toward the outer portion of the seventh lens 107.

Equation 8 above may satisfy at least one of the following conditions.

Condition 1: CA7-CA6 < CA6-CA5

Condition 2: (|Max_Sag62|*CG5) < CA7-CA6

Condition 3: |Max_Sag72| < |Max_Sag62|

Here, Max_Sag72 is the maximum distance from a straight line extending in a direction (X, Y) perpendicular to the center of the sensor side surface of the seventh lens 107 to the fourteenth surface S14 in the object side direction.

[Equation 9]

(CT6+CT7) < |Max_Sag72| < CG6

In Equation 9, Max_Sag72, the center thickness (CT6, CT7) of the 6th and 7th lenses, and the center distance (CG6) between the 6th and 7th lenses can be set. If this is satisfied, the optical system 1000 The outer portion of the effective area of the sensor side of the lens 107 may cover the outer portion of the sixth lens 106. Accordingly, the seventh lens 107 can refract light incident from the outside of the sixth lens 106 toward the image sensor 300. When the optical system 1000 according to the embodiment satisfies Equation 9, the size of the image sensor 300 can be increased compared to the TTL of the optical system 1000, thereby providing a slim optical system. When the optical system 1000 satisfies Equations 8 and 9, the optical system 1000 can improve distortion aberration characteristics and have good optical performance in the peripheral area of the field of view (FOV). Preferably, |Max_Sag72| The condition of < |Max_Sag71| can be satisfied. Also (CT1*2) < |Max_Sag72| The condition < (CT1*3) can be satisfied. The outer portion of the effective area of the sixth and seventh lenses 106 and 107 may include edges.

[Equation 9-1]

(CT3 + CT4 + CT5) < |Max_Sag71|

In Equation 8, Max_Sag71 is the maximum spaced value from a straight line extending in a direction (X, Y) perpendicular to the center of the object-side surface of the seventh lens 107 to the thirteenth surface (S13) in the object-side direction. , and CT3, CT4, and CT5 are the central thicknesses of the 3rd, 4th, and 5th lenses. If Equation 9-1 is satisfied, the optical system 1000 can reduce the central thickness of the lenses, and the outer portion of the effective area of the object-side surface of the seventh lens 107 can be extended toward the object. Accordingly, the seventh lens 107 has the maximum effective diameter and can refract the incident light toward the image sensor 300. When the optical system 1000 according to the embodiment satisfies Equation 9-1, the size of the image sensor 300 can be increased compared to the TTL of the optical system 1000, and a slim optical system can be provided. Preferably, 2 < |Max_Sag71| <3 conditions can be satisfied. The outer portion of the effective area of the object-side surface of the seventh lens 107 may include an edge.

[Equation 9-2]

CT2 < CT3 < CG1

In Equation 9-1, CT2 and CT3 are the center thicknesses of the second and third lenses, and CG1 is the center distance between the first and second lenses. If this is satisfied, the boundary between the first and second lens groups (LG1, LG2) The size of the lenses can be controlled and factors affecting distortion aberration can be controlled.

[Equation 10]

0 < CG6 / CG5 < 5

In Equation 10, if the optical axis spacing (CG6) between the sixth and seventh lenses (106, 107) and the optical axis spacing (CG5) between the fifth and sixth lenses (105, 106) are satisfied, even in the center and periphery of the field of view (FOV) It can have good optical performance. Additionally, the optical system 1000 can reduce distortion and have improved optical performance. Preferably, Equation 10 may satisfy 1 < CG6 / CG5 < 2.

[Equation 11]

0 < CG1 / CG6 < 1

In Equation 11, when the optical axis spacing (CG1) between the first and second lenses and the optical axis spacing (CG6) between the sixth and seventh lenses are satisfied, the optical system 1000 can improve aberration characteristics, and It is possible to control the size of the optical system 1000, for example, reducing the total track length (TTL). Preferably, Equation 11 may satisfy 0.2 < CG1 / CG6 < 0.8.

[Equation 12]

0 < CT1 / CT6 < 2

In Equation 12, if the center thickness (CT1) of the first lens 101 and the center thickness (CT6) of the sixth lens 106 are satisfied, the optical system 1000 may have improved aberration characteristics. Additionally, the optical system 1000 has good optical performance at a set angle of view and can control total track length (TTL). Preferably, Equation 12 may satisfy 0.5 < CT1 / CT6 < 1.

[Equation 13]

1 < CT6 / CT7 < 5

In Equation 13, if the center thickness (CT6) of the sixth lens 106 and the center thickness (CT7) of the seventh lens 107 are satisfied, the optical system 1000 determines the manufacturing accuracy of the sixth and seventh lenses. It can be alleviated and the optical performance of the center and periphery of the field of view (FOV) can be improved. Preferably, Equation 13 can satisfy 2 < CT6 / CT7 < 3.2.

[Equation 14]

0 < L6R2/L7R1 < 20

In Equation 14, L6R2 means the radius of curvature (mm) at the optical axis of the 12th surface (S12) of the sixth lens 106, and L7R1 means the radius of curvature (mm) of the 13th surface (S13) of the seventh lens 107. It refers to the radius of curvature at the optical axis. When the optical system 1000 according to the embodiment satisfies Equation 14, the aberration characteristics of the optical system 1000 may be improved. Preferably, Equation 14 may satisfy 1 < L6R2/L7R1 < 3.

[Equation 15]

0 < (CG6 - EG6) / (CG6) < 1

If Equation 15 satisfies the center spacing (CG6) and edge spacing (EG6) between the sixth and seventh lenses 106 and 107, the optical system 1000 can reduce the occurrence of distortion and have improved optical performance. . When the optical system 1000 according to the embodiment satisfies Equation 15, optical performance in the center and peripheral areas of the field of view (FOV) can be improved. Equation 15 may preferably satisfy 0 < (CG6 - EG6) / (CG6) < 0.5. Here, when comparing the center distances (CG) between the 4th, 5th, 6th, and 7th lenses, the condition CG4 < CG5 < CG6 can be satisfied.

[Equation 16]

0 < CA11 / CA22 < 2

In Equation 16, CA11 refers to the effective diameter (clear aperture, CA) of the first surface (S1) of the first lens 101, and CA22 refers to the effective diameter of the fourth surface (S4) of the second lens 102. means. When the optical system 1000 according to the embodiment satisfies Equation 16, the optical system 1000 can control the optical path incident and emitted from the first lens group LG1 and have improved aberration control characteristics. . Equation 16 may preferably satisfy 1 < CA11 / CA22 < 1.5.

[Equation 17]

1 < CA62 / CA21 < 5

In Equation 17, CA21 refers to the effective diameter of the third surface (S3) of the second lens 102, and CA62 refers to the effective diameter of the twelfth surface (S12) of the sixth lens 106. When the optical system 1000 according to the embodiment satisfies Equation 17, the optical system 1000 can control the path of light incident on the second lens group LG2 and improve aberration characteristics. Preferably, Equation 17 may satisfy 3 < CA62 / CA21 < 5.

[Equation 18]

0.5 < CA12 / CA21 < 1.5

In Equation 18, if the effective diameter (CA12) of the second surface (S2) of the first lens 101 and the effective diameter (CA21) of the third surface (S3) of the second lens 102 are satisfied, The difference in effective diameter between the two lens groups (LG1, LG2) can be reduced and light loss can be suppressed. Additionally, the optical system 1000 can improve chromatic aberration and control vignetting for optical performance. Preferably, Equation 18 may satisfy 0.9 < CA12 / CA21 < 1.2.

[Equation 19]

0.1 < CA42 / CA62 < 1

In Equation 19, if the effective diameter (CA42) of the eighth surface (S8) of the fourth lens 104 and the effective diameter (CA62) of the twelfth surface (S12) of the sixth lens 106 are satisfied, the second lens The optical path to the group (LG2) can be set. Additionally, the optical system 1000 can improve chromatic aberration. Preferably, Equation 19 may satisfy 0.4 < CA42 / CA62 ≤ 0.8.

[Equation 20]

1 < CA72 / CA11 < 5

In Equation 20, if the effective diameter (CA72) of the 14th surface (S14) of the seventh lens 107 and the effective diameter (CA11) of the first surface (S1) of the first lens 101 are satisfied, the entrance lens You can set the effective diameter and optical path between the and the last lens. Accordingly, the optical system 1000 can set the angle of view and the size of the optical system. Preferably, Equation 20 may satisfy 2 < CA72 / CA11 < 4.

[Equation 20-1]

5 < CA72 / CG6 < 20

In Equation 201-1, CA72 is the effective diameter of the largest lens surface and is the effective diameter of the 14th surface (S14) of the seventh lens 107. When the optical system 1000 according to the embodiment satisfies Equation 20-1, the optical system 1000 can improve aberration characteristics and control total track length (TTL) reduction. Preferably, Equation 11-1 may satisfy 5 < CA72 / CG6 < 12.

[Equation 20-2]

3 < CA72 / CG5 < 15

Equation 20-2 can set the effective diameter (CA72) of the 14th surface (S14) of the 7th lens 107 and the optical axis gap (CG5) between the 5th and 6th lenses (105 and 106). When the optical system 1000 according to the embodiment satisfies Equation 20-2, the optical system 1000 can improve aberration characteristics and control total track length (TTL) reduction. Preferably, Equation 20-2 may satisfy 8 < CA72 / CG5 < 15.

[Equation 21]

0 < CG3 / EG3 < 5

In Equation 21, if the optical axis spacing (CG3) and edge spacing (EG3) between the third and fourth lenses 103 and 104 are satisfied, the optical system 1000 can reduce chromatic aberration and improve aberration characteristics. And vignetting can be controlled for optical performance. Preferably, Equation 21 may satisfy 0.5 < CG3 / EG3 < 1.5.

[Equation 22]

0 < CG6 / EG6 < 5

In Equation 22, if the optical axis spacing (CG6) and edge spacing (EG6) between the sixth and seventh lenses (106, 107) are satisfied, the optical system can have good optical performance even in the center and periphery of the field of view (FOV), and distortion Occurrence can be suppressed. Preferably, 1 < CG6 / EG6 < 1.5 may be satisfied.

At least one of Equations 21 and 22 may further include at least one of Equations 22-1 to 22-6.

[Equation 22-1] 1 < CG1 / EG1 < 3

[Equation 22-2] 1 < CG2 / EG2 < 3

[Equation 22-3] 1 < CG4 / EG4 < 5

[Equation 22-4] 1 < CG5 / EG5 < 3

[Equation 22-5] 7 < (CG6 / EG6)*n < 10

[Equation 22-6] (CG6 / EG6) < (CT6 / ET6)

Here, n is the total number of lenses.

The optical path of the optical system 1000 can be adjusted by setting the effective diameter of each lens and the center spacing and edge spacing between adjacent lenses using Equations 16 to 22. Accordingly, the optical system can have good optical performance even in the center and peripheral areas of the field of view (FOV), and the occurrence of distortion can be suppressed.

[Equation 23]

0 < G6_max / CG6 < 2

In Equation 23, G6_Max means the maximum distance (mm) between the sixth and seventh lenses 106 and 107. When the optical system 1000 according to the embodiment satisfies Equation 23, optical performance can be improved in the periphery of the field of view (FOV), and distortion of aberration characteristics can be suppressed. Preferably, G6_max and CG6 in Equation 23 may be the same.

[Equation 24]

0 < CT5 / CG6 < 5

In Equation 24, if the center thickness (CT5) of the fifth lens 105 and the optical axis spacing (CG6) between the sixth and seventh lenses 106 and 107 are satisfied, the optical system 1000 has a maximum optical axis spacing (CG6). The central thickness of the and fifth lenses 105 can be set, and the optical performance of the peripheral part of the field of view (FOV) can be improved. Preferably, Equation 24 may satisfy 0 < CT5 / CG6 < 1.

[Equation 25]

1 < CG6 / CT6 < 5

In Equation 25, if the center thickness (CT6) of the sixth lens 106 and the optical axis gap (CG6) between the sixth and seventh lenses (106 and 107) are satisfied, the optical system 1000 is configured to use the sixth and seventh lenses. The effective diameter size and spacing can be reduced, and optical performance in the peripheral area of the field of view (FOV) can be improved. Preferably, Equation 25 may satisfy 2 < CG6 / CT6 < 4.

[Equation 26]

1 < CG6 / CT7 < 10

In Equation 26, if the center thickness (CT7) of the seventh lens 107 and the optical axis gap (CG6) between the sixth and seventh lenses (106, 107) are satisfied, the optical system 1000 has an effective diameter of the seventh lens. The size and optical axis spacing between the sixth and seventh lenses can be reduced, and optical performance in the peripheral area of the field of view (FOV) can be improved. Preferably, Equation 26 can satisfy 5 < CG6 / CT7 < 8.

[Equation 27]

1 < ｜L5R2 / CT5｜ < 50

In Equation 27, if the radius of curvature (L5R2) of the tenth surface (S10) of the fifth lens 105 and the central thickness (CT5) of the fifth lens 105 are satisfied, the optical system 1000 has the fifth By controlling the refractive power of the lens 105, the optical performance of light incident on the second lens group LG2 can be improved. Preferably, Equation 27 may satisfy 10 < | L5R2 / CT5 | < 35. Preferably, the condition L5R2 < 0 may be satisfied.

[Equation 28]

2 < ｜L5R1 / L7R1 ｜ < 20

In Equation 28, if the radius of curvature (L5R1) of the ninth surface (S9) of the fifth lens 105 and the radius of curvature (L7R1) of the thirteenth surface (S13) of the seventh lens 107 are satisfied, 5,7 The optical performance can be improved by controlling the shape and refractive power of the lens, and the optical performance of the second lens group (LG2) can be improved. Preferably, Equation 28 may satisfy 5 < | L5R1 / L7R1 | < 15. Preferably, the conditions L5R1 > 0 and L7R1 < 0 may be satisfied.

[Equation 29]

0 < L1R1/L1R2 < 1

Equation 29 can set the curvature radii (L1R1, L1R2) of the object-side first surface (S1) and second surface (S2) of the first lens 101, and if these are satisfied, the lens size and resolution can be set. there is. Preferably, Equation 29 may satisfy 0.2 < L1R1/L1R2 < 0.7. Preferably, L1R1 > 0 and L1R2 > 0 may be satisfied.

[Equation 30]

0 < L2R2/L2R1 < 5

Equation 30 can set the curvature radii (L2R1, L2R2) of the object-side third surface (S3) and fourth surface (S4) of the second lens 102, and if these are satisfied, the resolution of the lens can be determined. . Preferably, Equation 30 may satisfy 0 < L2R2/L2R1 < 1. Preferably, L2R1 > 0 and L2R2 > 0 may be satisfied.

At least one of Equations 28, 29, and 30 may include at least one of Equations 30-1 to 30-6 below, and can determine the resolution of each lens.

[Equation 30-1] 0 < ｜L3R1/L3R2 ｜ < 1

[Equation 30-2] 0 < L4R1/L4R2 < 1 (however, L4R1, L4R2 < 0)

[Equation 30-3] 1 < ｜L5R1/L5R2 ｜ < 3 (however, L5R1 >0, L5R2 < 0)

[Equation 30-4] 0 < L6R1/L6R2 < 1.5 (however, L6R1 >0, L6R2 > 0)

[Equation 30-5] 0 < L7R1/L7R2 < 1.5 (however, L7R1 <0, L7R2 < 0)

[Equation 30-6] L6R1*L6R2 < L1R1*L1R2

[Equation 31]

0 < CT_Max / CG_Max < 2

In Equation 31, if the center thickness of each of the lenses satisfies the thickest thickness (CT_max) and the maximum value (CG_max) of the air gap or gap on the optical axis between the plurality of lenses, the optical system ( 1000) has good optical performance at a set viewing angle and focal distance, and the optical system 1000 can be reduced in size, for example, reducing TTL (total track length). Preferably, Equation 31 may satisfy 0.2 < CT_Max / CG_Max < 0.8.

[Equation 32]

0 < ΣCT / ΣCG < 2

In Equation 32, ΣCT means the sum of the center thicknesses (mm) of each of the plurality of lenses, and ΣCG means the sum of the spacing (mm) on the optical axis (OA) between two adjacent lenses in the plurality of lenses. it means. When the optical system 1000 according to the embodiment satisfies Equation 32, the optical system 1000 has good optical performance at a set angle of view and focal distance, and the optical system 1000 can be reduced in size, for example, by reducing the size of the optical system 1000 (total track TTL). length) can be reduced. Preferably, Equation 32 may satisfy 0.5 < ΣCT / ΣCG < 1. Accordingly, the optical system can be designed to reduce the central thickness of each lens and increase the gap between adjacent lenses.

[Equation 33]

10 < ∑Index <20

In Equation 33, ∑Index means the sum of the refractive indices at the d-line of each of the plurality of lenses. When the optical system 1000 according to the embodiment satisfies Equation 33, the TTL of the optical system 1000 can be controlled and improved resolution can be achieved. Here, the average refractive index of the first to seventh lenses 101-107 may be 1.50 or more. Preferably, Equation 33 can satisfy the condition of 10 < ∑Index < 15 and ∑Index*n < 80, where n is the total number of lenses.

[Equation 34]

10 < ∑Abb / ∑Index < 50

In Equation 34, ²Abbe means the sum of Abbe's numbers of each of the plurality of lenses. When the optical system 1000 according to the embodiment satisfies Equation 34, the optical system 1000 may have improved aberration characteristics and resolution. The average Abbe number of the first to seventh lenses 101-107 may be 45 or less. Preferably, Equation 34 can satisfy 20 < ∑Abb / ∑Index < 40. Preferably, the condition of (∑Abb - ∑Index) < 285 can be satisfied.

[Equation 35]

0 < |Max_distortion| < 5

In Equation 35, Max_distortion means the maximum value of distortion in the area from the center (0.0F) to the diagonal end (1.0F) based on the optical characteristics detected by the image sensor 300. When the optical system 1000 according to the embodiment satisfies Equation 35, the optical system 1000 can improve distortion characteristics. Preferably, equation 35 is 1 <|Max_distortion| <3 can be satisfied.

[Equation 36]

0 < EG_Max / CT_Max < 3

In Equation 36, CT_max refers to the thickest thickness (mm) among the center thicknesses of each of the plurality of lenses, and EG_Max refers to the maximum edge side spacing between two adjacent lenses. When the optical system 1000 according to the embodiment satisfies Equation 36, the optical system 1000 has a set angle of view and focal distance, and can have good optical performance in the periphery of the field of view (FOV). Preferably, Equation 36 may satisfy 1 < EG_Max / CT_Max < 2.5.

[Equation 37]

0.5 < CA11 / CA_min < 2

In Equation 37, if the effective diameter (CA11) of the first surface (S1) of the first lens 101 and the minimum effective diameter (CA_Min) of the lens surfaces are satisfied, the amount of light incident through the first lens 101 is controlled. It is possible to provide a slim optical system while maintaining optical performance. Preferably, Equation 37 may satisfy 1 < CA11/CA_min <1.5.

[Equation 38]

1 < CA_max / CA_min < 5

In Equation 38, CA_max refers to the largest effective diameter among the object side and sensor side of the plurality of lenses, and the largest effective diameter (mm) among the effective diameters (mm) of the first to fourteenth surfaces (S1-S14). . When the optical system 1000 according to the embodiment satisfies Equation 38, the optical system 1000 can provide a slim and compact optical system while maintaining optical performance. Preferably, Equation 38 may satisfy 3 < CA_max / CA_min < 4.5.

[Equation 39]

1 < CA_max / CA_AVR < 3

In Equation 39, the maximum effective diameter (CA_max) and the average effective diameter (CA_AVR) are set among the object side and the sensor side of the plurality of lenses. If these are satisfied, a slim and compact optical system can be provided. Preferably, Equation 39 may satisfy 2 < CA_max / CA_AVR < 2.5.

[Equation 40]

0.1 < CA_min / CA_AVR < 1

In Equation 40, the smallest effective diameter (CA_min) and average effective diameter (CA_AVR) can be set among the object side and sensor side of the plurality of lenses, and if these are satisfied, a slim and compact optical system can be provided. Preferably, Equation 40 may satisfy 0.3 < CA_min / CA_AVR < 0.9.

[Equation 41]

0.1 < CA_max / (2*Imgh) < 1

In Equation 41, set the largest effective diameter (CA_max) among the object side and sensor side of the plurality of lenses and the distance (Imgh) from the center (0.0F) of the image sensor 300 to the diagonal end (1.0F). If this is satisfied, the optical system 1000 has good optical performance in the center and periphery of the field of view (FOV) and can provide a slim and compact optical system. Here, the Imgh may range from 4 mm to 15 mm. Preferably, Equation 41 may satisfy 0.5 ≤ CA_max / (2*Imgh) < 1.

[Equation 42]

0.1 < TD / CA_max < 1.5

In Equation 42, TD is the maximum optical axis distance (mm) from the object side of the first lens to the sensor side of the last lens. For example, TD is the distance from the first surface (S1) of the first lens 101 to the 14th surface (S14) of the seventh lens 107 on the optical axis (OA). When the optical system 1000 according to the embodiment satisfies Equation 42, a slim and compact optical system can be provided. Preferably, Equation 42 may satisfy 0.3 < TD/CA_max <1.

[Equation 43]

0 < F / L6R2 < 5

In Equation 43, the total effective focal length (F) of the optical system 1000 and the radius of curvature (L6R2) of the 12th surface (S12) of the sixth lens 106 can be set. If these are satisfied, the optical system 1000 ) can reduce the size of the optical system 1000, for example, reduce the total track length (TTL). Preferably, Equation 43 may satisfy 1 < F/L6R2 < 3.

Equation 43 may further include Equation 43-1 below.

[Equation 43-1]

2 < F / F# < 8

The F# may mean the F number. Preferably, Equation 43-1 may satisfy 2 < F / F # < 5.

[Equation 43-2]

1 < F / ｜L7R2｜ < 5

Equation 43-2 can set the total effective focal length (F) of the optical system 1000 and the radius of curvature (L7R2) of the 14th surface (S14) of the seventh lens 107. Preferably, Equation 43-2 may satisfy 1 < F / L7R2 < 3.

[Equation 44]

1 < F / L1R1 < 10

In Equation 44, the radius of curvature (L1R1) and the total effective focal length (F) of the first surface (S1) of the first lens 101 can be set, and if these are satisfied, the optical system 1000 (1000) can be reduced in size, for example, reducing TTL (total track length). Preferably, Equation 44 may satisfy 1 < F / L1R1 < 5.

[Equation 45]

0 < EPD / ｜L7R2 ｜ < 5

In Equation 45, EPD refers to the size (mm) of the entrance pupil of the optical system 1000, and L7R2 refers to the radius of curvature (mm) of the 14th surface (S14) of the seventh lens 107. it means. When the optical system 1000 according to the embodiment satisfies Equation 45, the optical system 1000 can control the overall brightness and have good optical performance in the center and periphery of the field of view (FOV). Preferably, Equation 45 may satisfy 0 < EPD / | L7R2 | < 1.

Equation 45 may further include Equation 45-1 below.

[Equation 45-1] 1 < EPD / F# < 3

[Equation 46]

0.5 < EPD / L1R1 < 8

Equation 46 represents the relationship between the size of the entrance pupil of the optical system and the radius of curvature of the first surface S1 of the first lens 101, and can control incident light. Preferably, Equation 46 may satisfy 0.5 < EPD / L1R1 < 2.

[Equation 47]

0 < ｜F1 / F2 ｜ < 2

In Equation 47, the focal lengths (F1, F2) of the first and second lenses (101 and 102) can be set. Accordingly, resolution can be improved by adjusting the refractive power of the incident light of the first and second lenses 101 and 102, and TTL can be controlled. Preferably, Equation 47 can satisfy 0 < |F1/F2 | < 1, and can satisfy the conditions of F1 > 0 and F2 < 0.

[Equation 48]

0 < F1 / F < 5

By setting the focal length (F1) and the total focal length (F) of the first lens in Equation 48, the optical system 1000 can improve resolution by adjusting the refractive power of the incident light, and the TTL of the optical system 1000 (total track length) can be controlled. Preferably, Equation 48 may satisfy 1 < F1 / F < 3. The focal length F1 of the first lens 101 may be the focal length of the first lens group LG1.

[Equation 49]

0 < |F27 / F1| < 2

In Equation 49, set the focal length of the first lens (F1), that is, the focal length (mm) of the first lens group, and the composite focal length (F27) of the 2-7 lens, that is, the focal length of the second lens group. If this is satisfied, resolution can be improved by controlling the refractive power of the first lens group and the refractive power of the second lens group, and the optical system can be provided in a slim and compact size. Additionally, when Equation 49 is satisfied, the optical system 1000 can improve aberration characteristics such as chromatic aberration and distortion aberration. Equation 49 may preferably satisfy 0 < F27 / F1 < 1. Here, the conditions F1 > 0 and F27 < 0 can be satisfied.

Here, the focal distance according to the aperture position according to the embodiment can be defined as follows. The composite focal length before the aperture is F0S, and the composite focal distance after the aperture is FSI, and the following conditions can be satisfied.

Example 1: F0S > FSI (however, F0S is Infinity, FS1 > 0)

Example 2: F0S > FSI (however, F0S, FS1 > 0)

Example 3: F0S ≥ ｜FSI｜ (however, F0S >, FSI < 0)

Example 4:: F0S < ｜FSI ｜ (however, F0S > and FSI < 0)

Table 1 is data showing the focal distance according to the aperture position according to embodiments.

Example 1 Example 2 Example 3 Example 4 FOS infinity 10.280 11.042 10.806 FOI 8.127 8.093 -10.201 -156.083

[Equation 49-1]

0 < F12 -｜F37｜ < 5

In Equation 49-1, F12 is the composite focal length of the first to second lenses and may have positive refractive power, and F37 is the composite focal length of the third to seventh lenses and may have positive or negative refractive power. That is, F37 may have positive refractive power in the first to third embodiments, and may have negative refractive power in the fourth embodiment. When Equation 49-1 is satisfied, the optical system 1000 can improve aberration characteristics such as chromatic aberration and distortion aberration.

[Equation 50]

0 < F1/F12 < 3

In Equation 50, the focal length of the first lens 101 and the composite focal distance of the first and second lenses can be set, and resolution can be improved. Equation 50 can satisfy 0 < F1/F12 < 1, and satisfies the condition of F12 > 0.

[Equation 50-1] 1 < ｜F2 ｜/F < 10 (here, F2 < 0)

[Equation 50-2] 0 < |F3 / F2| < 1 (where F3 > 0)

[Equation 50-3] 1 < |F4| / F < 10 (where F4 < 0)

[Equation 50-4] 1 < F5 / F < 10 (here, F5 > 0)

[Equation 50-5] 1 < F6 / F < 10 (here, F6 > 0)

[Equation 50-7] 0 < |F7| / F < 2 (where F7 < 0)

[Equation 50-7] |F7| < F6

In equations 50-1 to 50-7, F3, F4, F5, F6, and F7 mean the focal length (mm) of the 3rd, 4th, 5th, 6th, and 7th lenses (103, 104, 105, 106, 107), and if this is satisfied, the Resolution can be improved by controlling the refractive power, and the optical system can be provided in a slim and compact size.

[Equation 51]

0 < F1 / F37 < 2

By setting the focal length (F1) of the first lens and the composite focal length (F37) of the 3-7th lens in Equation 51, the resolution of the first lens group can be adjusted. Preferably, Equation 51 may satisfy 0 < F1/ F37 < 1.

[Equation 52]

0 < |F12 / F37| < 2

By setting the composite focal length (F12) of the first and second lenses and the composite focal length (F37) of the third to seventh lenses in Equation 52, the size and resolution of the optical system can be adjusted. Preferably, Equation 52 may satisfy 0.5 < F12 / F37 < 1.5.

[Equation 53]

0 < F1/F4 < 1

By setting the focal length (F1) of the first lens and the focal length (F4) of the fourth lens in Equation 53, the refractive power of light incident on the first and second lens groups can be controlled, and the size and resolution of the optical system can be adjusted. there is. Preferably, Equation 53 may satisfy 0 < F1/F4 < 0.7.

[Equation 54]

2 < TTL < 20

In Equation 54, TTL (Total Track Length) means the distance (mm) on the optical axis (OA) from the vertex of the first surface (S1) of the first lens 101 to the upper surface of the image sensor 300. do. Preferably, Equation 54 can satisfy 5 < TTL < 15, and thus a slim and compact optical system can be provided.

[Equation 55]

2 < Imgh

Equation 55 sets the diagonal size (2*Imgh) of the image sensor 300 to exceed 4 mm, thereby providing an optical system with high resolution. Equation 55 may preferably satisfy 4 < Imgh < 15 or 6 ≤ Imgh ≤ 12.

Equation 55 may include at least one of the following Equations 55-1 to 55-4.

[Equation 55-1] 0 < ∑CT/Imgh < 1

[Equation 55-2] 0 < ∑CG/Imgh < 1

[Equation 55-3] 1 < ∑Index/Imgh < 3

[Equation 55-4] 20 < ∑Abbe/Imgh < 65

[Equation 55-5] (∑CT/n) < (∑CT/Imgh)

[Equation 55-6] (∑CG/n) < (∑CG/Imgh)

[Equation 55-7] (∑Index/n) < (∑Index/Imgh)

[Equation 55-8] (∑Abbe/n) < (∑Abbe/Imgh)

Equations 55-1 to 55-8 establish the relationship between Imgh and the sum of the center thicknesses of all lenses, the sum of the center spacing between lenses, the sum of refractive indices of all lenses, the sum of Abbe numbers of all lenses, and the number of total lenses. You can. Accordingly, the resolution and size of the optical system with an Imgh of more than 4 mm or more than 6 mm can be adjusted.

[Equation 56]

BFL < 2.5

Equation 56 sets the BFL (Back focal length) to less than 2.5 mm, so that installation space for the filter 500 can be secured, and the assembly of components is improved through the gap between the image sensor 300 and the last lens. Combined reliability can be improved. Equation 56 may preferably satisfy 0.5 < BFL < 1.5.

[Equation 57]

2 < F < 20

In Equation 57, the total focal length (F) can be set to suit the optical system, and preferably, 5 < F < 15 can be satisfied.

[Equation 58]

FOV < 120

In Equation 58, FOV (Field of view) refers to the angle of view (Degree) of the optical system 1000, and can provide an optical system of less than 120 degrees. The FOV may be 70 degrees or more, for example, in the range of 70 degrees to 100 degrees.

[Equation 59]

0.1 < TTL / CA_max < 2

By setting the largest effective diameter (CA_max) and TTL (Total track length) among the object side and sensor side of the plurality of lenses in Equation 59, a slim and compact optical system can be provided. Preferably, Equation 59 may satisfy 0.5 < TTL / CA_max < 1.

[Equation 60]

0.5 < TTL / Imgh < 3

Equation 60 can set the total optical axis length (TTL) of the optical system and the diagonal length (Imgh) of the optical axis of the image sensor 300. When the optical system 1000 according to the embodiment satisfies Equation 60, the optical system 1000 applies a relatively large image sensor 300, for example, a large image sensor 300 of about 1 inch or so. It can secure a back focal length (BFL) and have a smaller TTL, enabling high image quality and a slim structure. Preferably, Equation 60 may satisfy 1 < TTL / Imgh < 1.5. Preferably, the conditions Imgh < TTL and the conditions 50 < TTL*Imgh < 70 can be satisfied.

[Equation 61]

0.01 < BFL / Imgh < 0.5

Equation 61 can set the optical axis spacing between the image sensor 300 and the last lens and the diagonal length from the optical axis of the image sensor 300. When the optical system 1000 according to the embodiment satisfies Equation 61, the optical system 1000 applies a relatively large image sensor 300, for example, a large image sensor 300 of about 1 inch or so. It is possible to secure the back focal length (BFL) for this purpose, and to minimize the gap between the last lens and the image sensor 300, so it is possible to have good optical characteristics in the center and periphery of the field of view (FOV). Preferably, Equation 61 may satisfy 0.05 < BFL / Imgh < 0.4.

[Equation 62]

4 <TTL/BFL<12

Equation 62 can set (unit, mm) the total optical axis length (TTL) of the optical system and the optical axis spacing (BFL) between the image sensor 300 and the last lens. When the optical system 1000 according to the embodiment satisfies Equation 62, the optical system 1000 secures BFL and can be provided in a slim and compact manner. Equation 62 can satisfy 7 < TTL / BFL < 11.

[Equation 63]

0.5 < F/TTL < 1.5

Equation 63 can set the total focal length (F) and total optical axis length (TTL) of the optical system 1000. Accordingly, a slim and compact optical system can be provided. Equation 63 may preferably satisfy 0.5 < F / TTL < 1.

[Equation 63-1]

0 < F# / TTL < 0.5

Equation 63-1 can set the F number (F#) and total optical axis length (TTL) of the optical system 1000. Accordingly, a slim and compact optical system can be provided.

[Equation 64]

3 < F/BFL < 10

Equation 64 can set the overall focal length (F) of the optical system 1000 and the optical axis spacing (BFL) between the image sensor 300 and the last lens. When the optical system 1000 according to the embodiment satisfies Equation 64, the optical system 1000 can have a set angle of view and an appropriate focal distance, and a slim and compact optical system can be provided. Additionally, the optical system 1000 can minimize the gap between the last lens and the image sensor 300 and thus have good optical characteristics in the peripheral area of the field of view (FOV). Preferably, Equation 64 may satisfy 5 < F/BFL < 10.

[Equation 65]

0 < F / Imgh < 3

Equation 65 can set the total focal length (F, mm) of the optical system 1000 and the diagonal length (Imgh) at the optical axis of the image sensor 300. This optical system 1000 uses a relatively large image sensor 300, for example, around 1 inch, and may have improved aberration characteristics. Preferably, Equation 65 may satisfy 0.8 < F / Imgh < 1.5.

[Equation 66]

1 < F/EPD < 5

Equation 66 can set the total focal length (F) and entrance pupil size (EPD) of the optical system 1000. Accordingly, the overall brightness of the optical system can be controlled. Preferably, Equation 66 may satisfy 1.5 < F / EPD < 3.

[Equation 67]

0 < BFL/TD < 0.5

In Equation 67, the optical axis distance (BFL) between the image sensor 300 and the last lens and the optical axis distance (TD) of the lenses are set. If this is satisfied, the optical system 1000 can provide a slim and compact optical system. there is. Preferably, Equation 67 may satisfy 0 < BFL/TD < 0.3. When BFL/TD exceeds 0.3, BFL is designed to be large compared to TD, so the size of the entire optical system becomes large, making miniaturization of the optical system difficult, and the distance between the seventh lens and the image sensor becomes long, so the seventh lens The amount of unnecessary light may increase between the image sensor and the image sensor, which causes a problem in that resolution is lowered, such as aberration characteristics are deteriorated.

[Equation 68]

0 < EPD/Imgh/FOV < 0.2

In Equation 68, the relationship between the entrance pupil size (EPD), the length of 1/2 the maximum diagonal length of the image sensor (Imgh), and the angle of view (FOV) can be established. Accordingly, the overall size and brightness of the optical system can be controlled. Equation 68 may preferably satisfy 0 < EPD/Imgh/FOV < 0.1.

[Equation 69]

10 < FOV / F# < 55

Equation 69 can establish the relationship between the angle of view of the optical system and the F number. Equation 69 may preferably satisfy 30 < FOV/F# < 50.

[Equation 70]

0 < n1/n2 <1.5

When the refractive indices (n1, n2) at the d-line of the first and second lenses (101, 102) of Equation 70 satisfy the above range, the optical system can improve the resolution of incident light. Preferably, the condition 0.5 < n1/n2 < 1 may be satisfied.

[Equation 71]

0 < n3 / n4 < 1.5

If the refractive indices (n3, n5) at the d-line of the third and fourth lenses (103, 104) of Equation 71 satisfy the above range, the optical system can improve the resolution of the incident light of the second lens group (LG2). . Preferably, Equation 71 may satisfy 0.5 < n3/n4 <1.

[Equation 72]

(v2*n2) < (v1*n1)

In Equation 72, if the refractive index (n1) and Abbe number (v1) of the first lens 101 and the refractive index (n2) and Abbe number (v2) of the second lens 102 are satisfied, the first and second lenses (101, 102) ), the color dispersion of the transmitted light can be controlled.

[Equation 73]

0 < Inf61/Inf62 < 1.5

In Equation 73, the distance (Inf61) from the optical axis (OA) to the critical point (P1) of the 11th surface (S11) of the sixth lens 106 and the distance (Inf62) to the critical point (P2) of the 12th surface (S12) ) can be set, and if this is satisfied, the curvature aberration of the sixth lens can be controlled. Equation 73 can satisfy 0.5 < Inf61/Inf62 < 1.2.

[Equation 74]

0 < Inf51/Inf61 < 1.5

In Equation 74, the distance from the optical axis OA to the critical point of the ninth surface S9 of the fifth lens 105 (Inf51) and the distance from the critical point of the eleventh surface S11 of the sixth lens 106 ( Inf61) can be set, and if this is satisfied, the curvature aberration of the 5th and 6th lenses can be controlled. Equation 74 can satisfy 0.2 < Inf51/Inf62 < 1.

[Equation 75]

0 < Inf61/Inf71 < 0.6

If Equation 75 is satisfied, the distance to the critical point of the object-side surfaces of the 6th and 7th lenses 106 and 107 can be set, and the curvature aberration of the 6th and 7th lenses can be controlled accordingly. Equation 75 can satisfy 0.2 < Inf61/Inf71 <0.5.

[Equation 76] 10 < (TTL/Imgh)*|Max_Sag72|*n < 20

Equation 76 can set the edge height, TTL, and Imgh of the sensor side of the last lens, and preferably satisfies 10 < (TTL/Imgh)*|Max_Sag72|*n < 15.

[Equation 77] 8 < (F/Imgh)*|Max_Sag72|*n < 20

Equation 77 can set the edge height and F, Imgh of the sensor side of the last lens, and preferably satisfies 8 < (F/Imgh)*|Max_Sag72|*n < 15.

[Equation 78] 50 < (TD_LG2/TD_LG1)*n < 100

[Equation 79] 15 < (CT_Max+CG_Max)*n < 30

[Equation 80] 80 < (FOV*TTL)/n < 150

Preferably, Equation 80 can satisfy the condition of 100 < (FOV*TTL)/n < 140, depending on the angle of view and the number of lenses (n).

[Equation 81] (TTL*n) < FOV

[Equation 82] 700 < CA_Max*TD*n < 950

[Equation 83] 130 < |Max_Sag|*TD*n < 180

In Equation 83, Max_Sag is the maximum Sag value (absolute value) among the object side and sensor side of each lens, and preferably satisfies the condition of 130 < |Max_Sag|*TD*n < 160. Here, the condition of 2 < |Max_Sag| can be satisfied.

In equations 76 to 83, n is the total number of lenses, and according to the total number of lenses, the optical axis distance (TD_LG1) of the first lens group (LG1), the optical axis distance (TD_LG2) of the second lens group (LG2), and the maximum center of the lens Thickness (CT_Max), maximum center spacing (CG_max), FOV, TTL, maximum Sag value on the sensor side of the seventh lens 107 or maximum Sag value in the entire lens (Max_Sag), optical axis distance (TD) of the lenses, etc. A relationship can be established. Accordingly, it is possible to control the chromatic aberration, resolution, size, etc. of an optical system with eight or fewer lenses.

[Equation 84]

In Equation 84, Z is Sag and can mean the distance in the optical axis direction from any position on the aspherical surface to the vertex of the aspherical surface. The Y may refer to the distance from any position on the aspherical surface to the optical axis in a direction perpendicular to the optical axis. The c may refer to the curvature of the lens, and K may refer to the Conic constant. Additionally, A, B, C, D, E, and F may mean aspheric constants.

The optical system 1000 according to the embodiment may satisfy at least one or two of Equations 1 to 83. In this case, the optical system 1000 may have improved optical characteristics. In detail, when the optical system 1000 satisfies at least one or two of Equations 1 to 83, the optical system 1000 has improved resolution and can improve aberration and distortion characteristics. In addition, the optical system 1000 can secure a back focal length (BFL) for applying a large-sized image sensor 300, and can minimize the gap between the last lens and the image sensor 300, thereby minimizing the angle of view ( It can have good optical performance in the center and periphery of the field of view (FOV). In addition, when the optical system 1000 satisfies at least one of Equations 1 to 83, it may include an image sensor 300 of a relatively large size, have a relatively small TTL value, and be slimmer. A compact optical system and a camera module having the same can be provided.

3, 10, 17, and 24 are examples of lens data of the optical system according to the first to fourth embodiments.

3, 10, 17, and 24, the optical system according to the embodiment includes the radius of curvature at the optical axis OA of the first to seventh lenses 101-107, the central thickness of each lens ( CT), center spacing between lenses (CG), refractive index at d-line (588nm), Abbe's Number and effective radius (Semi-Aperture), and focal length.

The sum of the refractive indices of the plurality of lenses 100 is 10 or more, the Abbe sum is 250 or more, for example, in the range of 250 to 300, and the sum of the center thicknesses of all lenses is 5 mm or less, for example, in the range of 2 mm to 5 mm. The sum of the center spacing between the first to seventh lenses on the optical axis may be 6 mm or less, for example, in the range of 3 mm to 6 mm, and the difference from the sum of the center thicknesses of the lenses may be more than 0.5 mm. In addition, the average value of the effective diameter of each lens surface of the plurality of lenses 100 is 8 mm or less, for example, in the range of 3 mm to 8 mm. The average central thickness of each lens may be less than 1 mm, for example in the range of 0.4 mm to 0.7 mm. The sum of the effective diameters of each lens surface of the plurality of lenses 100 is the effective diameter of the first surface S1 to the fourteenth surface S14, and may be less than 120 mm, for example, in the range of 70 mm to 90 mm.

4, 11, 18, and 25, the lens surface of at least one or all of the plurality of lenses in the embodiment may include an aspherical surface with a 30th order aspheric coefficient. For example, the first to seventh lenses 101, 102, 103, 104, 105, 106, and 107 may include lens surfaces having a 30th order aspheric coefficient from the first surface S1 to the fourteenth surface S14. As described above, an aspheric surface with a 30th order aspheric coefficient (a value other than “0”) can particularly significantly change the aspherical shape of the peripheral area, so the optical performance of the peripheral area of the field of view (FOV) can be well corrected.

5, 12, 19, and 26, the first to seventh thicknesses (T1-T7) of the first to seventh lenses (101-107) according to the first to fourth embodiments are formed from the center of each lens to the edge. It can be expressed at intervals of 0.1 mm or more in the direction (Y) facing. In addition, the spacing between adjacent lenses is a first spacing (G1) between the first and second lenses, a second spacing (G2) between the second and third lenses, a third spacing (G3) between the third and fourth lenses, In the direction from the center to the edge for the fourth gap (G4) between the 4th and 5th lenses, the 5th gap (G5) between the 5th and 6th lenses, and the 6th gap (G6) between the 6th and 7th lenses. It can be expressed at intervals of 0.1 mm or more.

In the first thickness T1, the maximum thickness is located at the center and may be 1.5 times or more, for example, 1.5 to 4 times the minimum thickness. The maximum spacing of the first spacing G1 is located at the center, and the difference in the minimum spacing may be 1 time or more, for example, in the range of 1 to 3 times. The maximum thickness of the second thickness T2 is located at the edge and may be 1.1 times or more, for example, 1.1 to 3 times the minimum thickness. The maximum spacing of the second spacing G2 is located at the center and may be 1.1 times or more, for example, 1.1 to 3 times the minimum spacing. In the third thickness T3, the maximum thickness is located at the center and may be 1.1 times or more, for example, 1.1 to 3 times the minimum thickness. The maximum spacing of the third spacing G3 is located at the edge and may be at least 1 times the minimum spacing, for example, in the range of 1 to 3 times. The maximum thickness of the fourth thickness T4 is located at the edge and may be at least 1 time the minimum thickness, for example, 1 to 3 times the range. The maximum interval of the fourth interval G4 may be 5 times or less, for example, 1 to 5 times the minimum interval. In the fifth thickness T5, the maximum thickness is located at the center B and may be more than 1 time, for example, 1 to 3 times the minimum thickness. The maximum spacing of the fifth spacing G5 is located at the edge and may be 5 times or less, for example, 1 to 5 times the minimum spacing. The maximum thickness of the sixth thickness T6 is located at the edge and may be at least 1 times the minimum thickness, for example, in the range of 1 to 5 times. The maximum spacing of the sixth spacing G6 is located at the center and may be 5 times or more, for example, 5 to 15 times the minimum spacing. In the seventh thickness T7, the maximum thickness may be 3 times or more, for example, 3 to 10 times the minimum thickness. The optical system can be provided in a slim and compact size by using the above-described first to seventh thicknesses (T1-T7) and first to seventh intervals (G1-G7).

6, 13, 20, and 27 show the object side surface (L6S1) and the sensor side surface (L6S2) of the sixth lens 106 and the object side of the seventh lens 107 according to the first to fourth embodiments of the invention. It can be expressed as the height (Sag value) from the straight line in the Y-axis direction perpendicular to the center of the side surface (L7S1) and the sensor side surface (L7S2) to the lens surface at intervals of 0.1 or more, and Figure 32 shows the 6th and 7th lenses. This is a graphical representation of the Sag value data.

Referring to FIGS. 6, 13, 20, 27 and 32, the object side surface (L6S1) and the sensor side surface (L6S2) of the sixth lens have critical points that protrude toward the sensor side based on the center of each lens surface. It can be seen that the critical point (P1, see Figure 2) of L6S1 exists at 2.1 mm ± 0.3 mm from the optical axis, and the critical point (P2) of L6S2 exists at 2.1 mm ± 0.3 mm from the optical axis. . The critical point P3 of the object side surface L7S1 of the seventh lens may be provided at 5.41 mm ± 0.9 mm from the optical axis OA. Here, in the first to third embodiments, the critical point P3 may be located in the range of 5.4 mm ± 0.3 mm, and in the fourth embodiment, the critical point P3 may be located in the range of 6 mm ± 0.3 mm. The sensor side L7S2 of the seventh lens can be provided without a critical point from the optical axis to the edge. Here, as shown in FIG. 32, it can be seen that the Sag value of the object-side surface L7S2 of the seventh lens, that is, the separation distance in the optical axis direction, is provided the largest in the object-side direction.

Figures 7, 14, 21, and 28 are graphs showing the diffraction MTF characteristics of the optical system according to the first to fourth embodiments of the invention, and Figures 8, 15, 22, and 29 are graphs showing the diffraction MTF characteristics of the optical system according to the first to fourth embodiments of the invention. This is a graph showing the aberration characteristics of the optical system.

7, 14, 21, and 28, graphs measuring spherical aberration, astigmatic field curves, and distortion from left to right in the aberration graph of the optical system according to the embodiment. am. The X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. Additionally, the graph for spherical aberration is a graph for light in the approximately 470 nm, approximately 510 nm, approximately 555 nm, approximately 610 nm, and approximately 650 nm wavelength bands, and the graph for astigmatism and distortion aberration is a graph for light in the 555 nm wavelength band. In the aberration diagram of FIG. 8, it can be interpreted that the closer each curve is to the Y-axis, the better the aberration correction function. Referring to FIGS. 8, 15, 22, and 29, the optical system 1000 according to the embodiment has almost all You can see that the measured values in the area are adjacent to the Y axis. That is, the optical system 1000 according to the embodiment has improved resolution and can have good optical performance not only in the center but also in the periphery of the field of view (FOV). As confirmed in the above examples, the lens system of the embodiment according to the present invention is compact and lightweight with a lens configuration of 8 or less elements, for example, 7 elements, and at the same time, spherical aberration, astigmatism, distortion, chromatic aberration, and coma are all well corrected, resulting in high resolution. Since it can be implemented, it can be used by being built into the optical device of a camera.

Figure 30 shows the quadratic function closest to the curve passing through the ends of the effective area of the object-side surface and the sensor-side surface of each lens in the optical system according to each embodiment. Data from the end of the effective area of the object-side surface of the first lens to the end of the effective area of the sensor-side surface of the seventh lens can be expressed by approximating a quadratic function.

The quadratic function can be expressed as functions 1 to 4 for the first to fourth embodiments, and may have the following relationship.

[Function 1] y = 0.1867x ² - 0.6695x + z1

[Function 2] y = 0.1838x ² - 0.6586x + z2

[Function 3] y = 0.218x ² - 0.8416x + z3

[Function 4] y = 0.2919x ² - 1.0301x + z4

The z1, z2, z3, and z4 are coefficients that set the position in the y-axis direction and can be set to 2.3 ± 0.2. In addition, the fitting coefficient (R ² ) that can be expressed by approximating the lens data as a function in the functions 1 to 4 is 0.90, and the closer it is to 1, the closer it can be to the function.

These functions 1 to 4 may satisfy the condition y = mx ² - nx + z, where m may range from 0.18 to 0.3, n may range from 0.6 to 1.1, and z may range from 2.1 to 2.5.

Figure 31 shows the linear function closest to a straight line from the minimum effective diameter to the maximum effective diameter in an optical system according to an embodiment. For example, data from the end of the effective area of the object-side or sensor-side surface of the second lens to the end of the effective area of the sensor-side surface of the seventh lens can be expressed by approximating a linear function. The first-order function can be expressed as functions 5 to 8 for the first to fourth embodiments, and may have the following relationship.

[Function 5] y = 1.0161x - z5

[Function 6] y = 0.9973x - z6

[Function 7] y = 1.0548x - z7

[Function 8] y = 1.176x - z8

The z5, z6, z7, and z8 are coefficients that set the position in the y-axis direction and can be set to 0.1 to 0.5. In addition, the fitting coefficient (R ² ), which can be expressed by approximating the lens data as a function in functions 5-8, is 0.90 or more, and the closer it is to 1, the closer it can be to the function. These functions 5 to 8 may satisfy the condition y = ax - z, a may range from 0.90 to 1.2, and z may range from 0.1 to 0.5. Here, the linear function may be inclined at 40 degrees or more, for example, in the range of 40 to 52 degrees with respect to the optical axis.

As shown in Figures 30 and 31, a quadratic function connecting the ends of the effective area of each lens is set, and the ends of the effective area of the lens with the minimum effective diameter and the ends of the effective area of the lens with the maximum effective diameter are set as the linear function. This allows the size of the optical system to be optimally set.

Table 2 shows the items of the above-described equations in the optical system 1000 according to the embodiment, including the total track length (TTL), back focal length (BFL), and F value, which is the total effective focal length, of the optical system 1000. Imgh, it is about the focal length (F1, F2, F3, F4, F5, F6, F7), edge thickness (mm), edge spacing (mm), composite focal length, etc. of each of the first to seventh lenses.

item Example 1 Example 2 Example 3 Example 4 F 8.127 8.093 8.047 8.053 F1 10.756 10.762 11.042 10.806 F2 -20.505 -20.402 -22.445 -21.560 F3 14.742 15.044 16.174 17.745 F4 -26.403 -27.994 -31.292 -37.902 F5 18.622 18.059 18.373 18.951 F6 29.605 31.793 26.952 31.125 F7 -7.768 -7.846 -8.261 -9.435 F37 -45.170 -48.125 -136.647 -156.083 ET1 0.226 0.228 0.199 0.200 ET2 0.430 0.420 0.370 0.623 ET3 0.203 0.216 0.201 0.200 ET4 0.492 0.493 0.371 0.310 ET5 0.426 0.429 0.425 0.353 ET6 0.200 0.202 0.200 0.200 ET7 0.941 1.019 0.912 0.715 EG1 0.602 0.613 0.632 0.673 EG2 0.138 0.132 0.110 0.137 EG3 0.376 0.421 0.499 0.567 EG4 0.145 0.113 0.129 0.114 EG5 0.759 0.735 0.725 0.814 EG6 1.424 1.348 1.151 1.058 ∑Index 11.159 11.159 11.159 11.159 ∑Abbe 285.200 285.200 285.200 285.200 ∑CT 3.645 3.705 3.799 3.682 ∑CG 5.020 4.987 4.884 5.228 FOV 88.388 88.635 89.398 89.439 E.P.D. 4.013 4.006 4.009 3.683 BFL 0.986 0.958 0.966 0.741 TD 8.664 9.362 9.358 9.009 Imgh 8.077 8.070 8.071 8.156 SD 8.664 8.692 7.966 7.428 TTL 9.650 9.650 9.650 9.650 F# 2.025 2.020 2.007 2.186

Table 3 shows the result values for Equations 1 to 42 described above in the optical system 1000 of FIG. 1. Referring to Table 2, it can be seen that the optical system 1000 satisfies at least one, two, or three of Equations 1 to 42. In detail, it can be seen that the optical system 1000 according to the embodiment satisfies all of the above equations 1 to 42. Accordingly, the optical system 1000 can improve optical performance and optical characteristics in the center and periphery of the field of view (FOV).

math equation Example 1 Example 2 Example 3 Example 4 One 1 < CT1 / CT2 < 5 2.687 2.783 3.586 3.326 2 0 < CT2 / ET2 < 1 0.580 0.569 0.540 0.321 3 CT2+CT3+CT4 < CG6 Satisfaction Satisfaction Satisfaction Satisfaction 4 1.60 < n2 1.544 1.544 1.544 1.544 5 0.5 < Max_Sag72 to Sensor < 1.5 0.986 0.958 0.966 0.741 6 0.8 < BFL / Max_Sag72 to Sensor < 1.2 1.000 1.000 1.000 1.000 7 5 < |Max slope72| < 65 41.365 35.657 41.487 53.238 8 CG5 < |Max_Sag62| < CG6 Satisfaction Satisfaction Satisfaction Satisfaction 9 (CT6+CT7) < |Max_Sag72| < CG6 Satisfaction Satisfaction Satisfaction Satisfaction 10 0 < CG6 / CG5 < 5 1.419 1.458 1.676 1.636 11 0 < CG1 / CG6 < 1 0.475 0.485 0.506 0.428 12 0 < CT1 / CT6 < 2 0.852 0.837 0.925 0.896 13 1 < CT6 / CT7 < 5 2.719 2.484 1.624 1.171 14 0 < | L6R2 / L7R1 | < 20 1.349 1.337 1.290 1.190 15 0< (CG6 - EG6) / (CG6) < 1 0.216 0.253 0.344 0.444 16 0 < CA11 / CA22 < 2 1.155 1.152 1.216 1.266 17 1 < CA62 / CA21 < 5 4.015 3.953 3.905 4.199 18 0.5 < CA12 / CA21 < 1.5 1.118 1.115 1.104 1.151 19 0.1 < CA42 / CA62 < 1 0.535 0.542 0.548 0.532 20 1 <CA72/CA11<5 3.477 3.432 3.210 3.317 21 0 < CG3 / EG3 < 5 1.015 1.043 1.117 1.198 22 0 < CG6 / EG6 < 5 1.275 1.339 1.524 1.800 23 0 < G6_max / CG6 < 2 1.000 1.000 1.000 0.498 24 0 < CT5 / CG6 < 5 0.400 0.411 0.468 0.394 25 1 < CG6 / CT6 < 5 2.309 2.271 2.263 2.565 26 1 < CG6 / CT7 < 10 6.280 5.641 3.674 3.005 27 1 < |L5R2 / CT5| < 50 23.011 20.556 17.632 23.082 28 2 < |L5R1 / L7R1| < 20 9.905 10.607 12.449 10.011 29 0 < L1R1/L1R2 <1 0.410 0.408 0.421 0.375 30 0 < L2R2/L2R1 <5 0.681 0.680 0.709 0.717 31 0 < CT_Max / CG_Max < 2 0.433 3.326 4.108 0.394 32 0 < ∑CT / ∑CG < 2 0.726 0.743 0.778 0.704 33 10 < ∑Index <20 11.159 11.159 11.159 11.159 34 10 < ∑Abb / ∑Index <50 25.558 25.558 25.558 25.558 35 0 < |Max_distoriton| < 5 2.103 2.074 1.204 1.092 36 0 < EG_Max / CT_Max < 3 1.811 1.696 1.401 1.409 37 0.5 < CA11 / CA_min <2 1.155 1.152 1.216 1.279 38 1 < CA_max / CA_min < 5 4.015 3.953 3.905 4.244 39 1 < CA_max / CA_AVR < 3 2.238 2.211 2.177 2.200 40 0.1 < CA_min / CA_AVR < 1 0.557 0.559 0.558 0.519 41 0.1 < CA_max / (2*Imgh) < 1 0.864 0.852 0.841 0.833 42 0.1 < TD / CA_max < 1.5 0.621 0.681 0.689 0.663

Table 4 shows the result values for Equations 43 to 83 described above in the optical system 1000 of FIG. 1. Referring to Table 4, the optical system 1000 may satisfy at least one or two of Equations 1 to 42 and at least one, two or more, or three or more of Equations 43 to 83. In detail, it can be seen that the optical system 1000 according to the embodiment satisfies all of the above equations 1 to 83. Accordingly, the optical system 1000 can improve optical performance and optical characteristics in the center and periphery of the field of view (FOV).

math equation Example 1 Example 2 Example 3 Example 4 43 0 < F / L6R2 < 5 2.341 2.357 2.441 2.691 44 1 < F / L1R1 < 10 2.248 2.230 2.198 2.109 45 0 < EPD / ｜L7R2 ｜ < 5 0.588 0.597 0.637 0.687 46 0.5 < EPD / L1R1 < 8 1.110 1.104 1.095 0.964 47 0 < |F1 / F2| < 2 0.525 0.527 0.492 0.501 48 0 < F1 / F < 5 1.323 1.330 1.372 1.342 49 0 < |F27 / F1| < 2 0.238 0.224 0.081 0.069 50 0< F1/F12<3 0.576 0.573 0.601 1.293 51 0 < F1/F37 <2 0.557 0.573 0.627 -1.947 52 0 < F12/F37 <2 1.033 0.998 0.959 -0.664 53 0 < F1/F4 <1 0.407 0.384 0.353 0.285 54 2 < TTL < 20 9.650 9.650 9.650 9.650 55 2 < Imgh 8.077 8.070 8.071 8.156 56 BFL < 2.5 0.986 0.958 0.966 0.741 57 2 < F < 20 8.127 8.093 8.047 8.053 58 FOV < 120 88.388 88.635 89.398 89.439 59 0.1 < TTL / CA_max < 2 0.692 0.702 0.711 0.711 60 0.5 < TTL / Imgh < 3 1.195 1.196 1.196 1.183 61 0.01 < BFL / Imgh < 0.5 0.122 0.119 0.120 0.091 62 4 <TTL/BFL<12 9.791 10.073 9.986 13.025 63 0.5 < F/TTL < 1.5 0.842 0.839 0.834 0.834 64 3 < F/BFL < 10 8.246 8.448 8.327 10.869 65 0 < F / Imgh < 3 1.006 1.003 0.997 0.987 66 1 < F/EPD < 5 2.025 2.020 2.007 2.187 67 0 < BFL/TD < 0.3 0.114 0.102 0.103 0.082 68 0 < EPD/Imgh/FOV < 0.2 0.006 0.006 0.006 0.005 69 10 < FOV / F# < 55 43.648 43.872 44.543 40.915 70 0 < n1/n2 <1.5 0.930 0.930 0.930 0.930 71 0 < n3/n4 <1.5 0.930 0.930 0.930 0.930 72 (v2*n2) < (v1*n1) Satisfaction Satisfaction Satisfaction Satisfaction 73 0< Inf61/Inf62 <1.5 1.000 1.048 1.000 0.522 74 0< Inf51/Inf61 <1 0.524 0.500 0.500 1.000 75 0<Inf61/Inf71<0.6 0.389 0.400 0.400 0.200 76 10 <(TTL/Imgh)*|Max_Sag72|*n < 20 13.162 13.492 16.217 20.602 77 8 < (F/Imgh)*|Max_Sag72|*n < 20 11.085 11.316 13.523 17.192 78 50 < (TD_LG2/TD_LG1)*n <100 74.568 75.314 69.075 78.171 79 15 < (CT_Max+CG_Max)*n < 30 18.213 47.236 47.456 18.590 80 80 < (FOV*TTL)/n <150 121.849 122.189 123.242 123.304 81 (TTL*n) < FOV Satisfaction Satisfaction Satisfaction Satisfaction 82 700 <CA_Max*TD*n < 950 846.280 900.957 889.565 856.438 83 130 < |Max_Sag|*TD*n < 180 145.884 160.201 163.830 169.005

Figure 33 is a diagram showing a camera module according to an embodiment applied to a mobile terminal.

Referring to FIG. 33, the mobile terminal 1 may include a camera module 10 provided on the rear side. The camera module 10 may include an image capturing function. Additionally, the camera module 10 may include at least one of an auto focus, zoom function, and OIS function.

The camera module 10 can process image frames of still images or videos obtained by the image sensor 300 in shooting mode or video call mode. The processed image frame may be displayed on a display unit (not shown) of the mobile terminal 1 and may be stored in a memory (not shown). In addition, although not shown in the drawing, the camera module may be further disposed 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. At this time, at least one of the first camera module 10A and the second camera module 10B may include the optical system 1000 described above. Accordingly, the camera module 10 can have a slim structure and have improved distortion and aberration characteristics. Additionally, the camera module 10 can have good optical performance even in the center and peripheral areas of the field of view (FOV).

Additionally, 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 can be mainly used in conditions where the autofocus function using the image of the camera module 10 disclosed above is degraded, for example, in close proximity of 10 m or less or in dark environments. The autofocus device 31 may include a light emitting unit including a vertical cavity surface emitting laser (VCSEL) semiconductor device, and a light receiving unit such as a photo diode that converts light energy into electrical energy.

Additionally, the mobile terminal 1 may further include a flash module 33. The flash module 33 may include a light emitting device inside that emits light. The flash module 33 can be operated by operating a camera of a mobile terminal or by user control.

The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the above description has been made focusing on the examples, this is only an example and does not limit the present invention, and those skilled in the art will understand the above examples without departing from the essential characteristics of the present embodiment. You will be able to see that various modifications and applications are possible. For example, each component specifically shown in the examples can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

1st lens: 101
Second lens: 102
Third lens: 103
4th lens: 104
5th lens: 105
6th lens: 106
7th lens: 107
Image sensor: 300
Filter: 500
Optics: 1000

Claims (24)

It includes first to seventh lenses disposed along the optical axis in the direction from the object side to the sensor side,
The first lens has positive refractive power at the optical axis and has a meniscus shape convex toward the object,
The seventh lens has negative refractive power at the optical axis,
The object side and the sensor side of the sixth lens have a critical point,
The maximum angle between the normal line perpendicular to the tangent passing through the sensor side of the sixth lens and the optical axis is |Max slope62|,
The maximum angle between the normal line perpendicular to the tangent passing through the sensor side of the sixth lens and the optical axis is Max slope72,
Equation: 30 ≤ |Max slope72| ≤ 55
Equation: |Max slope72| < |Max slope62|
An optical system that satisfies . According to paragraph 1,
The object side of the seventh lens has a critical point,
An optical system in which the critical point of the sensor-side surface of the seventh lens is located closer to the edge than the critical points of the object-side surface and the sensor-side surface of the sixth lens. According to paragraph 2,
The sensor side of the seventh lens is provided without a critical point from the optical axis to the end of the effective area,
The optical axis distance from the center of the sensor side of the seventh lens to the image surface of the image sensor is BFL,
1/2 of the maximum diagonal length of the image sensor is Imgh,
Equation: 0.05 < BFL / Imgh < 0.4
An optical system that satisfies . According to paragraph 3,
The optical axis distance from the center of the object side of the first lens to the image surface of the image sensor is TTL,
Equation: 7 < TTL / BFL < 11
An optical system that satisfies . According to any one of claims 1 to 4,
The optical axis spacing between the 6th and 7th lenses is CG6,
The central thickness of the first to seventh lenses is CT1-CT7,
Equation: CT2+CT3+CT4 < CG6
An optical system that satisfies . According to clause 5,
The optical axis spacing between the fifth and sixth lenses is CG5,
Equation: CT2+CT3+CT4+CT5+CT6 < CG5+CG6
An optical system that satisfies . According to any one of claims 1 to 4,
The optical axis spacing between the fifth and sixth lenses is CG5,
The optical axis spacing between the 6th and 7th lenses is CG6,
The maximum separation distance from a straight line extending in a direction perpendicular to the center of the sensor side of the sixth lens to the sensor side in the optical axis direction is Max_Sag62,
Equation: CG5 < |Max_Sag62| < CG6
An optical system that satisfies . According to any one of claims 1 to 4,
Equation: 55 ≤ |Max slope62| ≤ 75
An optical system that satisfies . According to any one of claims 1 to 4,
An optical system in which the sensor side surface of the seventh lens has a convex shape at the optical axis. According to any one of claims 1 to 4,
The third lens has a shape where both sides are convex at the optical axis,
The fifth lens is an optical system having a shape in which both sides are convex at the optical axis. According to any one of claims 1 to 4,
The refractive indices of the first and second lenses at the d-line are n1 and n2,
The Abbe numbers of the first and second lenses are v1 and v2,
Equation: (v2*n2) < (v1*n1)
An optical system that satisfies . a first lens having a meniscus shape convex toward the object;
a second lens disposed on a sensor side of the first lens;
nth lens closest to the image sensor;
an n-1th lens disposed on an object side of the nth lens;
It includes two or more lenses disposed between the second lens and the n-1th lens,
The second lens has the smallest effective diameter among the lenses of the optical system,
The nth lens has the maximum effective diameter among the lenses of the optical system,
The sum of the central thicknesses of the lenses is ΣCT,
The sum of the optical axis spacing between two adjacent lenses is ΣCG,
The maximum central thickness of the lenses is CT_Max,
The maximum optical axis spacing between the adjacent lenses is CG_Max,
where n is the total number of lenses in the optical system,
Equation: 0.5 < ΣCT / ΣCG < 1
Equation: 15 < (CT_Max+CG_Max)*n < 30
An optical system that satisfies . According to claim 12,
An optical system in which the object side and the sensor side of the n-1th lens have critical points. According to claim 13,
The n-th lens has a meniscus shape convex toward the sensor,
The n-1th lens has a meniscus shape convex toward the object,
An optical system wherein the object-side surface of the n-th lens has a critical point at a position closer to an edge than the critical points of the n-1-th lens. The method according to any one of claims 12 to 14,
The optical axis spacing between the nth lens and the n-1th lens is CG6,
The CG6 is an optical system in which the central thickness of all lenses is greater than the sum of the central thicknesses of the four smaller lenses. According to claim 15,
The optical axis spacing between the n-1th lens and the n-2th lens is CG5,
An optical system in which the sum of the CG5 and the CG6 is greater than the sum of the central thicknesses of the four lenses with the largest central thickness among all lenses. The method according to any one of claims 12 to 14,
The optical axis distance from the center of the object side of the first lens to the image surface of the image sensor is TTL,
1/2 of the maximum diagonal length of the image sensor is Imgh,
The maximum separation distance from the center of the sensor side of the nth lens to the sensor side toward the object based on a straight line extending in a direction perpendicular to the optical axis is |Max_Sag72|,
The total number of lenses is n,
Equation: 10 < (TTL/Imgh)*|Max_Sag72|*n < 20
An optical system that satisfies . The method according to any one of claims 12 to 14,
The effective focal length of the optical system is F,
1/2 of the maximum diagonal length of the image sensor is Imgh,
The maximum separation distance from the center of the sensor side of the nth lens to the lens surface in the optical axis direction based on a straight line extending in a direction perpendicular to the optical axis is Max_Sag72,
Equation: 8 < (F/Imgh)*|Max_Sag72|*n < 20
An optical system that satisfies . According to clause 18,
The maximum separation distance from the center of the sensor side of the n-1th lens to the sensor side toward the object based on a straight line extending in a direction perpendicular to the optical axis is Max_Sag62,
The maximum separation distance from the center of the sensor side of the nth lens to the lens surface in the optical axis direction based on a straight line extending in a direction perpendicular to the optical axis is Max_Sag72,
Math equation: |Max_Sag72| < |Max_Sag62|
An optical system that satisfies . The method of claim 1 or 12,
It includes an aperture disposed around the object-side surface of the first lens,
In the optical system, the composite focal length before the aperture is FOS,
After the aperture, the composite focal length is FSI,
Equation: F0S > FSI
An optical system that satisfies . The method of claim 1 or 12,
It includes an aperture disposed around the sensor side of the first lens,
In the optical system, the composite focal length before the aperture is FOS,
After the aperture, the composite focal length is FSI,
Equation: F0S < ｜FSI｜
An optical system that satisfies . The method of claim 1 or 12,
The optical axis distance from the object side center of the first lens group to the image sensor is TTL,
The angle of view is FOV,
n is the total number of lenses,
Equation: (TTL*n) < FOV
An optical system that satisfies . The method of claim 1 or 12,
The effective diameter of the object-side surface and the sensor-side surface of the first lens gradually decreases toward the second lens,
An optical system in which the effective diameter gradually increases from the second lens to the last lens adjacent to the image sensor. an image sensor disposed on the sensor side of the plurality of lenses; and
Comprising an optical filter disposed between the image sensor and the last lens,
The optical system includes the optical system according to any one of claims 1 and 12,
F is the total focal length,
TTL is the distance on the optical axis from the center of the object side of the lens closest to the object side to the image surface of the sensor,
Imgh is 1/2 of the maximum diagonal length of the image sensor,
Equation: 0.5 < F/TTL < 1.5
0.5 < TTL / Imgh < 3
4 < Imgh < TTL
A camera module that satisfies the requirements.

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