WO2024049283A1

WO2024049283A1 - Optical system and camera module

Info

Publication number: WO2024049283A1
Application number: PCT/KR2023/013178
Authority: WO
Inventors: 심주용; 손창균
Original assignee: 엘지이노텍 주식회사
Priority date: 2022-09-02
Filing date: 2023-09-04
Publication date: 2024-03-07
Also published as: KR20240032506A

Abstract

An optical system disclosed in an embodiment of the invention comprises first to seventh lenses aligned along an optical axis from an object side toward a sensor side, wherein the refractive power of the first lens is negative, the combined refractive power of the third to seventh lenses is positive, the first lens has a meniscus shape of protruding from the optical axis toward the sensor side, the center distance between the first lens and the second lens is greater than the center thickness of each of the first to seventh lenses, the first to seventh lenses include a plurality of spherical lenses and a plurality of aspherical lenses, the spherical lens has an object-side surface and a sensor-side surface, which are spherical at the optical axis, the aspherical lens has an object-side surface and a sensor-side surface, which are aspherical at the optical axis, and at least one from among the plurality of aspherical lenses can be made of a material different from that of the spherical lens.

Description

Optics and camera modules

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

ADAS (Advanced Driving Assistance System) is an advanced driver assistance system to assist the driver in driving. It senses the situation ahead, judges the situation based on the sensed results, and controls the vehicle's behavior based on the situation judgment. It consists of For example, ADAS sensor devices detect vehicles in front and recognize lanes. Afterwards, when the target lane, target speed, and target ahead are determined, the vehicle's ESC (Electrical Stability Control), EMS (Engine Management System), and MDPS (Motor Driven Power Steering) are controlled. Typically, ADAS can be implemented as an automatic parking system, a low-speed city driving assistance system, and a blind spot warning system.

Sensor devices for detecting the situation ahead in ADAS include GPS sensors, laser scanners, front radar, and Lidar, and the most representative ones are cameras for photographing the front, rear, and sides of the vehicle. These cameras can be placed outside or inside a vehicle to detect the surrounding conditions of the vehicle. Additionally, the camera may be placed inside the vehicle to detect the situation of the driver and passengers. For example, the camera can photograph the driver from a location adjacent to the driver and detect the driver's health status, drowsiness, drinking, etc. In addition, the camera can photograph the passenger at a location adjacent to the passenger, detect whether the passenger is sleeping, state of health, etc., and provide information about the passenger to the driver.

In particular, the most important element in obtaining an image from a camera is the imaging lens that forms the image. Recently, interest in high performance such as high image quality and high resolution has been increasing, and research is being conducted on optical systems that include multiple lenses to realize this. However, there is a problem that the characteristics of the optical system change when the camera is exposed to harsh environments, such as high temperature, low temperature, moisture, high humidity, etc., outside or inside the vehicle. In this case, the camera has a problem in that it is difficult to uniformly derive excellent optical and aberration characteristics. Therefore, a new optical system and camera that can solve the above-mentioned problems are required.

An embodiment may provide an optical system and a camera module in which a glass lens and a plastic lens are mixed. An embodiment may provide an optical system and a camera module in which a spherical lens and an aspherical lens are mixed. The embodiment seeks to provide an optical system and camera module with improved optical characteristics. The embodiment seeks to provide an optical system and a camera module with excellent optical performance in low to high temperature environments. Embodiments seek to provide an optical system and a camera module that can prevent or minimize changes in optical properties in various temperature ranges.

An optical system according to an embodiment of the invention includes first to seventh lenses aligned along an optical axis from the object side to the sensor side, the refractive power of the first lens is negative, and a synthesis of the third to seventh lenses. The refractive power is positive, the first lens has a meniscus shape convex from the optical axis toward the sensor, and the center spacing between the first lens and the second lens is greater than the center thickness of each of the first to seventh lenses, The first to seventh lenses include a plurality of spherical lenses and a plurality of aspherical lenses. The spherical lens is a lens whose object-side surface and sensor-side surface are spherical on the optical axis, and the aspherical lens is a lens whose object-side surface and sensor-side surface are spherical on the optical axis. This lens is aspherical on the optical axis, and at least one of the plurality of aspherical lenses may be made of a material different from the spherical lens.

According to an embodiment of the invention, the number of spherical lenses may be twice or more than the number of aspherical lenses. At least one of the plurality of aspherical lenses may be made of the same glass material as the spherical lens, and at least another one may be made of plastic.

According to an embodiment of the invention, the first to sixth lenses may be made of glass, and the seventh lens may be made of plastic. The second to sixth lenses may be spherical lenses, and the first and seventh lenses may be aspherical lenses. The effective diameter of the first lens may be larger than the effective diameter of each of the fourth to seventh lenses. It includes an aperture disposed around the periphery between the second lens and the third lens, and the first lens may have a shape where both sides are concave at the optical axis.

According to an embodiment of the invention, the sensor side surface of the fourth lens and the object side surface of the fifth lens may be joined. According to an embodiment of the invention, the center spacing between the i-th lens and the i+1 lens is CGi, the center thickness of the i-th lens is CTi, the value of CTi/CGi is minimum when i is 1, and CTi/CGi The value of may be maximum when i is 3.

According to an embodiment of the invention, the center spacing between the first and second lenses may be greater than the sum of the center thicknesses of two adjacent lenses among the first to seventh lenses. The Abbe number of each of the first to fourth lenses is 50 or more, and the lens having the maximum refractive index among the first to seventh lenses may be the fifth lens.

An optical system according to an embodiment of the invention includes a first lens group having lenses of a first material aligned along an optical axis from the object side toward the sensor side; a second lens group disposed on a sensor side of the lenses of the first material and having lenses of a second material aligned along the optical axis; The number of lenses of the first material is more than twice the number of lenses of the second material, and the first lens closest to the object in the first lens group has a convex object side and a concave sensor side, and the first lens is The lens has positive refractive power, and the last lens closest to the image sensor in the second lens group has a convex object-side surface and a concave sensor-side surface, and the last lens has negative refractive power, and the first lens is made of the first material and The second material may be a different material.

According to an embodiment of the invention, the first material is a glass material, the second material is a plastic material, the object-side surface and the sensor-side surface of the first lens have an aspherical surface, and each of the lenses of the second material The object side and the sensor side may have aspherical surfaces.

According to an embodiment of the invention, the refractive index of the first lens is greater than 1.75, 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 center of the object-side surface of the last lens is TTL. The optical axis distance from the top surface of the image sensor is BFL, and can satisfy the equation: 4 < TTL / BFL < 10.

According to an embodiment of the invention, the optical axis distance from the center of the object side of the last lens to the image surface of the image sensor is BFL, 1/2 of the diagonal length of the image sensor is Imgh, and the equation: 1 < BFL / ImgH < 1.5 can be satisfied.

According to an embodiment of the invention, the effective focal length of the optical system is F, 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 image is imaged at the center of the object-side surface of the last lens. The optical axis distance to the top surface of the sensor is BFL, and can satisfy Equation 1: 2 ≤ TTL / F ≤ 3 and 1 < F / BFL < 3.

According to an embodiment of the invention, the first lens group includes first to fifth lenses, the second lens group includes sixth to seventh lenses, the seventh lens is the last lens, and the second lens group includes the sixth to seventh lenses. The focal length of lens 1 may be greater than the composite focal length of the second to seventh lenses.

According to an embodiment of the invention, the center thickness of the second lens is the largest among the center thicknesses of the first to seventh lenses, and the center distance between the first lens and the second lens is the center distance between adjacent lenses. It is the largest among them and may be larger than the central thickness of the second lens.

A camera module according to an embodiment of the invention includes an image sensor; first to seventh lenses aligned along the optical axis from the object side toward the sensor side; An aperture disposed between spherical lenses among the first to seventh lenses: an optical filter is included between the seventh lens and the image sensor, the first lens and the seventh lens are made of the same material, and the aperture The material of the lens disposed on the object side and the lens disposed on the sensor side of the aperture are different, the refractive power of the seventh lens is negative, and among the first to seventh lenses, two different lenses are disposed between the aperture and the image sensor. It includes a bonded lens to which the lens is bonded, and at least one of the lenses between the bonded lens and the image sensor may be an aspherical lens.

The optical system and camera module according to the embodiment may have improved optical characteristics. In detail, in the optical system according to the embodiment, a plurality of lenses may have a set thickness, refractive power, and distance from adjacent lenses. Accordingly, the optical system and camera module according to the embodiment can have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. in a set angle of view range, and can have good optical performance in the periphery of the angle of view.

Additionally, the optical system and camera module according to the embodiment may have good optical performance in a temperature range from low temperature (about -20°C to -40°C) to high temperature (85°C to 105°C). In detail, a plurality of lenses included in the optical system may have set materials, refractive powers, and refractive indices. Accordingly, even when the focal length of each lens changes due to a change in refractive index due to a change in temperature, the lenses can compensate for each other. That is, the optical system can effectively distribute refractive power in a temperature range from low to high temperatures, and prevent or minimize changes in optical properties in the temperature range from low to high temperatures. Therefore, the optical system and camera module according to the embodiment can maintain improved optical properties in various temperature ranges.

Additionally, the optical system and camera module according to the embodiment can satisfy the angle of view set through a combination of an aspherical lens and a spherical lens and implement excellent optical characteristics. Because of this, the optical system can provide a slimmer vehicle camera module. Accordingly, the optical system and camera module can be provided for various applications and devices, and can have excellent optical properties even in harsh temperature environments, for example, when exposed to the exterior of a vehicle or inside a vehicle at high temperatures in the summer.

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

FIG. 2 is a side cross-sectional view for explaining the relationship between the nth and n-1th lenses of FIG. 1.

Figure 3 is a table showing the lens characteristics of the optical system of Figure 1.

FIG. 4 is a table showing the aspheric coefficients of lenses in the optical system of FIG. 1.

Figure 5 is a table showing the thickness of each lens and the spacing between adjacent lenses in the optical system of Figure 1.

FIG. 6 is a table showing CRA (Chief Ray Angle) data at room temperature, low temperature, and high temperature according to the position of the image sensor in the optical system of FIG. 1.

FIG. 7 is a graph showing data on the diffraction MTF (Modulation Transfer Function) of the optical system of FIG. 1 at room temperature.

FIG. 8 is a graph showing data on the diffraction MTF of the optical system of FIG. 1 at low temperature.

FIG. 9 is a graph showing data on the diffraction MTF of the optical system of FIG. 1 at high temperature.

FIG. 10 is a graph showing data on aberration characteristics of the optical system of FIG. 1 at room temperature.

FIG. 11 is a graph showing data on aberration characteristics of the optical system of FIG. 1 at low temperature.

FIG. 12 is a graph showing data on aberration characteristics of the optical system of FIG. 1 at high temperature.

Figure 13 is a side cross-sectional view of an optical system and a camera module having the same according to the second embodiment.

Figure 14 is a table showing the lens characteristics of the optical system of Figure 13.

FIG. 15 is a table showing the aspheric coefficients of lenses in the optical system of FIG. 13.

FIG. 16 is a table showing the thickness of each lens and the gap between adjacent lenses in the optical system of FIG. 13.

FIG. 17 is a table showing CRA (Chief Ray Angle) data at room temperature, low temperature, and high temperature according to the position of the image sensor in the optical system of FIG. 13.

FIG. 18 is a graph showing data on the diffraction MTF of the optical system of FIG. 13 at room temperature.

FIG. 19 is a graph showing data on aberration characteristics of the optical system of FIG. 13 at room temperature.

Figure 20 is a graph showing relative illuminance according to the height of the image sensor according to the first and second embodiments.

Figure 21 is a side cross-sectional view of an optical system and a camera module having the same according to the third embodiment.

FIG. 22 is a side cross-sectional view for explaining the relationship between the nth and n-1th lenses of FIG. 21.

Figure 23 is a table showing the lens characteristics of the optical system of Figure 21.

Figure 24 is a table showing the aspheric coefficients of lenses in the optical system of Figure 21.

Figure 25 is a table showing the thickness of each lens and the gap between adjacent lenses in the optical system of Figure 21.

FIG. 26 is a table showing Sag values for the object side and sensor side of the lenses of the optical system of FIG. 21.

FIG. 27 is a table showing CRA (Chief Ray Angle) data at room temperature, low temperature, and high temperature according to the position of the image sensor in the optical system of FIG. 21.

FIG. 28 is a graph showing data on the diffraction MTF of the optical system of FIG. 21 at room temperature.

FIG. 29 is a graph showing data on the diffraction MTF of the optical system of FIG. 21 at low temperature.

FIG. 30 is a graph showing data on diffraction MTF at high temperature of the optical system of FIG. 21.

FIG. 31 is a graph showing data on aberration characteristics of the optical system of FIG. 21 at room temperature.

Figure 32 is a graph showing data on the aberration characteristics of the optical system of Figure 21 at low temperature.

Figure 33 is a graph showing data on the aberration characteristics of the optical system of Figure 21 at high temperature.

Figure 34 is a graph showing relative illuminance according to the height of the image sensor according to the third embodiment.

Figure 35 is a graph showing the Sag values of the object side and sensor side of the sixth and seventh lenses of Figure 22.

Figure 36 is an example of a vehicle having an optical system according to an embodiment of the invention.

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 optical axis spacing between lenses listed in the table for lens data may refer to values (unit, mm) 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 meaning of optical axis may include the center of each lens or a very narrow area near the optical axis.

1 is a side cross-sectional view of an optical system and a camera module according to a first embodiment. Figure 13 is a side cross-sectional view of the optical system and camera module according to the second embodiment. Figure 21 is a side cross-sectional view of the optical system and camera module according to the third embodiment. Referring to FIGS. 1, 13, and 21, the optical system 1000 may include a plurality of lens groups LG1 and LG2. In detail, each of the plurality of lens groups LG1 and LG2 includes at least one lens. 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 optical system 1000 may include n lenses, the nth lens may be the last lens, and the n-1th lens may be the lens closest to the last lens. The n is an integer of 5 or more, and may be, for example, 5 to 9. The number of lenses in each of the first lens group (LG1) and the second lens group (LG2) may be different. 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, may be more than two times or more than three times the number of lenses of the first lens group (LG1). there is. In the first and third embodiments, the number of lenses of the second lens group (LG2) may be 4 times or 5 times greater than the number of lenses of the first lens group (LG1).

The first lens group LG1 may include at least one lens. The first lens group LG1 may have three or fewer lenses. The first lens group LG1 may preferably include one or two lenses. The second lens group LG2 may include three or more or four lenses, and preferably may include five or six lenses.

The composite focal length of the first lens group LG1 can be defined as F_LG1, and the composite focal length of the second lens group LG2 can be defined as F_LG2, and the condition: F_LG2 < F_LG1 can be satisfied. In the first embodiment, the first lens group LG1 may be a two-element lens adjacent to an object, and the second lens group LG2 may be lenses excluding the lenses of the first lens group LG1. In the second and third embodiments, the first lens group LG1 may be a single lens adjacent to an object, and the second lens group LG2 may be lenses excluding the lenses of the first lens group LG1.

The first lens group LG1 may include an aspherical lens and a spherical lens. The second lens group LG2 may include a plurality of spherical lenses and at least one aspherical lens. The first lens group LG1 may include lenses made of glass. The first lens group LG1 may provide a glass lens as the lens closest to the object. These glass materials have less expansion and contraction due to changes in external temperature than plastic materials, and the surface is less likely to be scratched, preventing surface damage. The second lens group LG2 may include at least one lens made of glass and at least one lens made of plastic. The second lens group LG2 may include three or more glass lenses and at least one plastic lens, for example, four glass lenses and one plastic lens. The lens closest to the image sensor 300 within the optical system 1000 may be made of plastic. As another example, the second lens group LG2 may include two or more plastic lenses, such as two or three plastic lenses. Additionally, plastic lenses are effective in improving thinness and optical properties. The lens closest to the object in the first lens group LG1 may be an aspherical lens made of glass. Accordingly, the lens adjacent to the outside of the lens barrel can be made of glass. Among the lenses of the second lens group LG2, one or two lenses closest to the image sensor 300 may be made of plastic or may be provided as an aspherical lens. The aspherical lens is a lens in which the object-side surface and the sensor-side surface are aspherical, and the spherical lens is a lens in which the object-side surface and the sensor-side surface are spherical. That is, at least one aspherical lens adjacent to the image sensor 300 can compensate for various aberrations. The aspherical lenses can prevent spherical aberration within the optical system 1000, and since aberration does not occur even if the effective diameter is increased, it is possible to miniaturize and lighten the camera module. The aspherical lens may be made of a glass mold or plastic mold. For example, the second lens group LG2 may include a lens made of glass and a plastic mold lens.

In the first and second embodiments, among the lenses of the optical system 1000, the lens with the maximum Abbe number may be located in the first lens group LG1, and the lens with the maximum refractive index may be located in the second lens group. It may be located at (LG2), the maximum Abbe number may be 60 or more, and the maximum refractive index may be greater than 1.7. In the third embodiment, the lens having the maximum Abbe number may be located in the second lens group LG2, and the lens having the maximum refractive index may be located in the first lens group LG1, and the lens having the maximum refractive index may be located in the first lens group LG1. The Abbe number may be 65 or more, and the maximum refractive index may be 1.75 or more. A lens with the maximum Abbe number can reduce chromatic dispersion, and a lens with the maximum refractive index can increase chromatic dispersion of incident light. Additionally, a lens with the highest refractive index may be located closer to the image sensor or sensor side than a lens with the highest Abbe number.

The lens with the maximum effective diameter within the optical system 1000 may be a lens close to the object side or one of the lenses between two lenses on the object side and two lenses on the sensor side. The lens having the maximum effective diameter is made of glass and can be placed closest to the object. The effective diameter of each lens may be the diameter of the effective area where effective light is incident from each lens, and is the average of the effective diameter of the object side surface and the effective diameter of the sensor side surface. Embodiments of the invention can reduce the weight of the camera module, provide a cheaper manufacturing cost, and suppress deterioration of optical characteristics due to temperature changes by further mixing aspheric lenses in the optical system 1000. You can. In the optical system, various types of plastic lenses can replace glass lenses, and polishing and processing of lens surfaces such as aspherical surfaces or free-form surfaces can be easy.

Each of the lenses may include an effective area and an unactive 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 defined as an effective area or 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 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 lens barrel (not shown) that accommodates the lens. The lens barrel contacts lenses of a first material or lenses of different first and second materials, and may be made of plastic or metal. The lenses of the first material are continuously aligned along the optical axis (OA) in the object, and three or less or less than three lenses of the second material are arranged along the optical axis on the sensor side of the lenses of the first material. It can be. The first material is glass, and the second material is plastic.

The total track length or total top length (TTL) within the optical system 1000 may be greater than 2 times that of ImgH, for example, greater than 2 times and less than 15 times. Preferably, the condition of 4 < TTL/ImgH ≤ 10 can be satisfied. The TTL is the distance on the optical axis (OA) from the center of the object side of the first lens to the surface of the image sensor 300. The ImgH is 1/2 of the maximum diagonal length of the image sensor 300. Within the optical system 1000, an effective focal length (EFL) of 10 mm or more and a diagonal field of view (FOV) of less than 45 degrees can be provided as a standard optical system in a vehicle camera module. For example, the optical system and camera module according to the embodiment may be applied to a camera module for an Advanced Driving Assistance System (ADAS) installed indoors or outdoors in a vehicle.

The optical system 1000 may have a TTL/(2*ImgH) condition of 2.5 or more or 2.7 or more, for example, a range of 2.5 to 5, 2.5 to 4.7, or 3 to 5. The optical system 1000 sets the value of TTL/(2*ImgH) to 2.5 or more, thereby providing a lens optical system for a vehicle. The total number of lenses in the first and second lens groups (LG1 and LG2) is 9 or less or 8 or less. Accordingly, the optical system 1000 can provide an image without exaggeration or distortion for the image being formed.

In the first and second embodiments, the number of lenses having an effective diameter larger than the length of the image sensor 300 within the optical system 1000 may exceed 50% of the total number of lenses. Preferably, the number of lenses having an effective diameter smaller than the length of the image sensor 300 may be 40% or less of the total number of lenses, for example, in the range of 10% to 40%. In the third embodiment, the number of lenses with an effective diameter larger than the length of the image sensor 300 in the optical system 1000 is more than 70% of the total number of lenses, and the number of lenses with an effective diameter smaller than the length of the image sensor 300 is more than 70% of the total number of lenses. may be less than 30% of the total number of lenses. At least one or all of the aspherical lenses in the optical system 1000 may have an effective diameter smaller than the length of the image sensor 300. The length of the image sensor 300 is the maximum length of the diagonal line in the direction perpendicular to the optical axis OA.

The effective diameter of the lens closest to the object within the

lens units

100, 100A, and 100B may be larger than the effective diameter of the lens closest to the image sensor 300. Additionally, the effective diameters of the lens disposed on the object side of the aperture ST and the lens disposed on the sensor side may be larger than the diagonal length of the image sensor 300. Within the

lens units

100, 100A, 100B, the object-side aspherical lens may have an effective diameter larger than the diagonal length of the image sensor 300, and the sensor-side aspherical lens may have an effective diameter smaller than the diagonal length of the image sensor 300. there is. Accordingly, the brightness of the optical system can be controlled. By controlling the effective diameter size of each lens, the optical system 1000 can control incident light to compensate for deterioration in resolution and optical characteristics due to temperature changes, and improve chromatic aberration control characteristics. The optical system 1000 ) can be improved.

The optical system 1000 may include at least one bonded

lens

145, 145A, and 134 therein. The bonded

lenses

145, 145A, and 134 may be lenses in which two lenses with different focal lengths are bonded together. The bonded

lenses

145, 145A, 134 have a bonded object-side lens and a sensor-side lens, and the effective diameter of the object-side lens among the bonded

lenses

145, 145A, 134 may be larger or smaller than the effective diameter of the sensor-side lens. For example, in the first and second embodiments, the effective diameter of the object-side lens of the bonded lens (145, 145A) may be larger than the effective diameter of the sensor-side lens, and the effective diameter of the object-side lens of the bonded lens (145, 145A) may be larger than the effective diameter of the object-side lens of the bonded lens (145, 145A) It may be larger than the length of 300, and the effective diameter of the sensor-side lens may be arranged within a range of ±110% of the diagonal length of the image sensor 300. In the third embodiment, the effective diameter of the lenses disposed on the object side with respect to the bonded lens 134 may be larger than the length of the image sensor 300. The object-side lens 104 and the sensor-side lens 105 of the bonded lens 134 may be longer than the length of the image sensor 300.

The bonded

lenses

145, 145A, and 134 may be spherical lenses. The bonded lenses may be bonded using a transparent resin material. The effective diameters of the lenses disposed close to the object based on the bonded

lenses

145, 145A, and 134 may be larger than the length of the image sensor 300. At least one lens surface among the lenses disposed close to the sensor based on the bonded

lenses

145, 145A, and 134 may have an effective diameter smaller than the length of the image sensor 300. The bonded

lenses

145, 145A, and 134 may be disposed between a spherical lens and a spherical lens in an optical system.

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 sensor side of the lens closest to the sensor side among the lenses in the first lens group (LG1). It may be the optical axis spacing between the object side surfaces of the lens closest to the object side among the lenses in the second lens group LG2. In the first and second embodiments, the optical axis spacing between the first lens group LG1 and the second lens group LG2 may be 0.5 times or less than the optical axis distance of the first lens group LG1, for example, It may be in the range of 0.01 to 0.5 times the optical axis distance of the first lens group (LG1). In the first and second embodiments, the optical axis distance between the first lens group (LG1) and the second lens group (LG2) may be 0.3 times or less than the optical axis distance of the second lens group (LG2), for example, 0.01. It may range from 2x to 0.3x. In the third embodiment, the optical axis distance between the first and second lens groups (LG1 and LG2) may be 0.5 times or less than the optical axis distance of the second lens group (LG2), for example, in the range of 0.1 to 0.5 times. . 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 image sensor 300. In the first and second embodiments, the two lens surfaces facing each other in the area between the first and second lens groups (LG1 and LG2) have a shape in which the sensor-side surface of the object-side lens is concave and the object-side surface of the sensor-side lens is convex. You can have Alternatively, the two opposing surfaces may have a shape in which the sensor-side surface of the object-side lens is convex and the object-side surface of the sensor-side lens is concave at the optical axis. In the third embodiment, the two lens surfaces facing each other in the area between the first and second lens groups LG1 and LG2, for example, the sensor-side surface of the object-side lens may be concave and the object-side surface of the sensor-side lens may be concave. there is. 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.

The first lens group LG1 may have positive (+) refractive power, and the second lens group LG2 may have positive (+) refractive power. In the first and second embodiments, the

first lenses

101 and 111 closest to the object in the first lens group LG1 have negative refractive power, and in the third embodiment, the first lens 121 has positive refractive power. It can have a refractive power of Among the lenses of the second lens group LG2, the lens closest to the image sensor may have negative (-) refractive power. Additionally, the composite focal length (F27) of the second to seventh lenses may have a positive (+) value.

When expressing the focal length as an absolute value, in the first and second embodiments, the focal length of the first lens group (LG1) is 1.5 times or more than the focal length of the second lens group (LG2), for example, 1.5 to 5 times. It may be a range. In the third embodiment, the focal length of the first lens group LG1 may be 5 times or more, for example, 5 to 15 times the focal length of the second lens group LG2. The effective focal length (EFL) of the optical system 1000 may be smaller than the focal length of the first lens group (LG1), and the difference with the focal length of the second lens group (LG2) may be less than 5. In the first to third embodiments, the effective focal length EFL may be smaller than the absolute value of the focal length of the first lens group LG1. The effective focal length (EFL) of the optical system 1000 may be smaller than the absolute value of the focal length of the second lens group LG2.

The

lens units

100, 100A, and 100B may be a mixture of spherical lenses and aspherical lenses. The number of lenses of the aspherical lens may be less than 50% of the total number of lenses, and may range from 10% to 40%. The number of lenses with negative (-) refractive power in the

lens units

100 and 100A of the first and second embodiments may be smaller than the number of lenses with positive (+) refractive power, for example, with negative (-) refractive power. The number of lenses may be less than 50% of the total number of lenses, for example, in the range of 20% to 45%. In the lens 100B of the third embodiment, the number of lenses with negative (-) refractive power within the optical system 1000 may be greater than the number of lenses with positive (+) refractive power. The number of lenses with negative (-) refractive power may be 50% or more of the total number of lenses, for example, in the range of 50% to 70% or 50% to 65%.

In the first and second embodiments, when expressing the absolute value of the focal length, the average of the focal distances of the spherical lenses may be smaller than the average of the focal distances of the aspherical lenses. The average refractive index of the aspherical lenses may be smaller than the average refractive index of the spherical lenses. Additionally, the average effective diameter of the spherical lenses may be larger than the average effective diameter of the aspherical lenses. Accordingly, when two or more aspherical lenses are disposed within the camera module, the weight of the camera module can be reduced and optical characteristics can be improved. Since the

first lenses

101 and 111 closest to the object are arranged to have a higher Abbe number and lower refractive index than the

second lenses

102 and 112, the distance between the first and second lenses can be increased. In addition, the n-th lens adjacent to the image sensor 300 is arranged to have a lower Abbe number and a higher refractive index than the n-1-th lens, so color dispersion can be improved at a location adjacent to the image sensor 300.

In the lens unit 100B of the third embodiment, when the focal length is taken as an absolute value, the focal distance of the lens closest to the object may be smaller than the focal distance of the last lens. The absolute value of the focal length of the last lens may be the largest in the optical system and may be larger than the focal length (F_LG1) of the first lens group (LG1). If the focal length of the last lens is F7, the condition F_LG1 < F7 can be satisfied.

The lens unit 100B may include lenses made of a first material and lenses made of a second material different from the first material. The first material may be a glass material, and the second material may be a plastic material. The lenses of the first material may be adjacent to the object and aligned along the optical axis, and the lenses of the second material may be adjacent to the image sensor 300 and aligned along the optical axis. Lenses of the first material can be defined as a first material group, and lenses of the second material can be defined as a second material group. The number of lenses in the first material group may be 1.5 times or more, for example, 2 times or more, than the number of lenses in the second material group. The average central thickness of the lenses made of the first material may be greater than the average central thickness of the lenses made of the second material. The average refractive index of the lenses made of the first material may be greater than the average refractive index of the lenses made of the second material. Additionally, the average effective diameter of the lenses made of the first material may be larger than the average effective diameter of the lenses made of the second material. Lenses made of the first material may include a lens having a spherical surface and a lens having an aspherical surface. Lenses of the second material may include lenses having an aspherical surface. The optical system 1000 is a mixture of lenses made of glass and plastic, so that various aberrations can be corrected according to temperature changes and the camera module can be lightweight.

In the first to third embodiments of the invention, the sum of the refractive indices of the lenses of the

lens units

100, 100A, and 100B is 8 or more, for example, in the range of 8 to 15, and the average refractive index may be in the range of 1.60 to 1.70 or 1.60 to 1.72. there is. The sum of the Abbe numbers of each of the lenses may be 220 or more, for example, in the range of 220 to 400 or 270 to 390, and the average of the Abbe numbers may be 55 or less, for example, in the range of 31 to 55. The sum of the central thicknesses of all lenses may be 15 mm or more, for example, in the range of 15 mm to 35 mm, 15 mm to 30 mm, or 20 mm to 30 mm. The average of the central thicknesses of the entire lens may be 5 mm or less, for example, in the range of 2.8 mm to 4 mm or in the range of 2.8 mm to 5 mm. The sum of the center spacings between the lenses at the optical axis (OA) may be greater than 4 mm, for example in the range of 4.5 mm to 10 mm or in the range of 4 mm to 20 mm, and may be less than the sum of the center thicknesses of the lenses. Additionally, the average value of the effective diameter of each lens surface of the

lens units

100, 100A, and 100B may be 8 mm or more, for example, in the range of 8 mm to 15 mm.

The F number of the optical system or camera module according to the first to third embodiments of the invention may be 2.4 or less, for example, in the range of 1.4 to 2.4 or 1.5 to 1.8. In the optical system according to embodiments of the invention, the maximum angle of view (diagonal) may be 50 degrees or less, for example, in the range of 20 degrees to 50 degrees, 20 degrees to 55 degrees, or 25 degrees to 40 degrees. The horizontal field of view (FOV_H) of the vehicle optical system in the Y-axis direction may be greater than 20 degrees and less than 40 degrees, for example, in the range of 25 degrees to 35 degrees. Additionally, the vertical angle of view is provided at a smaller angle than the horizontal angle of view, and may be 20 degrees or less, for example, in the range of 10 to 20 degrees. At this time, the sensor length in the horizontal direction (Y) may be 8.064 mm ± 0.5 mm, and the sensor height in the vertical direction (X) may be 4.54 mm ± 0.5 mm. The horizontal angle of view (FOV_H) is the angle of view based on the horizontal length of the sensor. Accordingly, it is possible to suppress changes in the focus imaging position due to temperature changes, and it is possible to provide a vehicle camera in which various aberrations are well corrected.

The optical system 1000 or camera module may include an image sensor 300. The image sensor 300 can detect light and convert it into an electrical signal. The image sensor 300 can detect light that sequentially passes through the

lens units

100, 100A, and 100B. 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). Here, the number of lenses having an effective diameter larger than the length of the image sensor 300 may be 5 to 6, and the number of lenses having an effective diameter smaller than the length of the image sensor 300 may be 1 or 2.

The optical system 1000 or camera module 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 lenses of the

lens units

100, 100A, and 100B. For example, the

optical systems

100, 100A, and 100B may be disposed between the last lens and the image sensor 300.

The cover glass 400 is disposed between the optical filter 500 and the image sensor 300, protects the upper part of the image sensor 192, and can prevent the reliability of the image sensor 192 from deteriorating. The cover glass 400 can be removed. The optical filter 500 may include an infrared filter or an infrared cut-off 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.

The optical system 1000 according to embodiments may include an aperture (ST). The aperture ST can control the amount of light incident on the optical system 1000. The aperture ST may be disposed between any two lenses in the

lens units

100, 100A, and 100B. For lenses disposed between an object and the aperture ST, the effective diameter of the lens tends to become smaller as it moves from the object side to the aperture ST. In the lenses disposed between the aperture ST and the image sensor 300, the effective diameters of the lenses tend to become smaller as they move from the aperture ST to the sensor. 'The effective diameter of the lenses tends to decrease as it moves from the aperture (ST) to the sensor side.' This means that, in the lenses disposed between the aperture (ST) and the image sensor 300, the aperture This does not mean that the effective diameters of the lenses only decrease as they move from (ST) to the sensor side, and at least one lens surface may be larger than the object-side lens surface. In the lenses disposed between the aperture ST and the image sensor, as in an embodiment of the present invention, the effective diameter of the lenses increases and then decreases as it moves from the aperture ST toward the sensor.

First lenses (101, 111, 121) and second lenses (102, 112, 122) are disposed on the object side of the aperture (ST), and third lenses (103, 113, 123) and fourth lenses (104, 114, 124) are disposed on the sensor side of the aperture (ST). You can. When the aperture ST is disposed on the sensor side of the

second lens

102, 112, and 122, the effective diameter of the object-side surface of the first lens > the effective diameter of the sensor-side surface of the first lens > the effective diameter of the object-side surface of the second lens. satisfies the conditions. It satisfies the condition of effective diameter of the sensor-side surface of the second lens 102 and 112 (effective aperture diameter) > effective diameter of the object-side surface of the third lens > effective diameter of the sensor-side surface of the fourth lens.

The aperture ST may be placed at a set position. The aperture ST may be disposed around the object side or sensor side of any one of the lenses of the first lens group LG1. For example, the aperture ST may be disposed around the sensor-side surface of the sensor-side lens of the first lens group LG1, that is, around the sensor-side surface of the second lens 102. As another example, the aperture ST may be disposed around the object side or sensor side of the lens closest to the object side among the lenses of the second lens group LG2. Alternatively, the aperture ST may be disposed around the object-side surface or the sensor-side surface of the object-side lens of the first lens group LG1. Alternatively, at least one lens selected from among the plurality of lenses may function as an aperture. In detail, the object side or the sensor side of one lens selected from among the lenses of the optical system 1000 may function as an aperture to adjust the amount of light.

Since the embodiment is an optical system applied to a vehicle camera, aspherical lenses and spherical lenses can be used together, and the first lens closest to the object can be made of glass. This has the advantage that glass material is more resistant to scratches than plastic material and is not sensitive to external temperature. To more effectively prevent scratches when placed inside a vehicle or caused by foreign substances, the first lens may be made of glass, and the object-side surface of the first lens may have a concave shape so as not to contact external structures. If the object-side surface of the first lens is designed to have a convex shape, scratches may occur due to contact with an external structure. For driver monitoring when driving a vehicle, photographing the front/rear of the vehicle, or detecting lanes and unexpected objects around the vehicle, the angle of view may be greater than 20 degrees and less than 40 degrees, for example, in the range of 25 degrees to 35 degrees. This horizontal angle of view may be a preset angle for an advanced driver assistance system.

The optical system 1000 according to the embodiment may further include a reflection member (not shown) for changing 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.

The optical system according to the first embodiment of the invention will be described with reference to FIGS. 1 to 12. 1 to 3, the optical system 1000 according to the first embodiment includes a lens unit 100, and the lens unit 100 includes first lenses 101 to 7 lenses 107. It can be included. The first to seventh lenses 101-107 may be sequentially arranged along the optical axis OA. Light corresponding to object information 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 and

second lenses

101 and 102 may be a first lens group (LG1), and the third to seventh lenses (103, 104, 105, 106, and 107) may be a second lens group (LG2). The first lens 101 is the lens closest to the object. The seventh lens 107 is the lens closest to the image sensor 107.

The first lens 101 may have positive (+) or negative (-) refractive power at the optical axis (OA). The first lens 101 may have negative (-) refractive power. The first lens 101 may include a plastic material or a glass material, for example, a glass material. The first lens 101 made of glass can reduce changes in the center position and radius of curvature due to temperature changes depending on the surrounding environment, and protect the incident side surface of the optical system 1000. On the optical axis, the object-side first surface S1 of the first lens 101 may be concave, and the sensor-side second surface S2 may have a concave shape. The first lens 101 may have a concave shape on both sides of the optical axis. Differently, at the optical axis OA, the first surface S1 may have a convex shape, and the second surface S2 may have a concave shape. Alternatively, the first lens 101 may have a meniscus shape that is convex from the optical axis OA toward the sensor. This first lens 101 may be provided as an aspherical lens made of glass. The aspheric coefficients of the first and second surfaces S1 and S2 may be provided as L1S1 and L1S2 in FIG. 4. The effective radius of the first surface S1 of the first lens 101 may be larger than the effective radii of the object-side surface and the sensor-side surface of the second to seventh lenses 102-107. Since the first surface (S1) is concave and the second surface (S2) has a concave shape, the incident light is refracted in a direction close to the optical axis (OA), and the first lens 101 and the second lens ( 102) The distance between them can be set farther apart. The first surface S1 of the first lens 101 may be provided without a critical point from the optical axis OA to the end of the effective area, that is, the edge. The second surface S2 of the first lens 101 may be provided without a critical point.

The second lens 102 may be disposed between the first lens 101 and the third lens 103. The second lens 102 may have positive (+) or negative (-) refractive power at the optical axis (OA). The second lens 102 may have positive (+) refractive power. The second lens 102 may include plastic or glass. For example, the second lens 102 may be made of glass. Based on the optical axis OA, the object-side third surface S3 of the second lens 102 may be convex, and the sensor-side fourth surface S4 may have a convex shape. The second lens 102 may have a shape in which both sides are convex at the optical axis. Alternatively, the second lens 102 may have a meniscus shape that is convex toward the object. Alternatively, the third surface S3 may be concave and the fourth surface S4 may be convex. Alternatively, the second lens 102 may have a concave shape on both sides. The second lens 102 may be provided as a spherical lens made of glass. The third surface S3 and the fourth surface S4 may be spherical. At least one or both of the third surface S3 and the fourth surface S4 may be provided without a critical point from the optical axis OA to the end of the effective area.

The third lens 103 may have positive (+) or negative (-) refractive power at the optical axis (OA). The third lens 103 may have positive (+) refractive power. The third lens 103 may include plastic or glass. For example, the third lens 103 may be made of glass. Based on the optical axis, the object-side fifth surface S5 of the third lens 103 may be convex, and the sensor-side sixth surface S6 may have a convex shape. The third lens 103 may have a shape in which both sides are convex at the optical axis. Alternatively, the third lens 103 may have a meniscus shape that is convex toward the sensor or toward the object. Alternatively, the third lens 103 may have a concave shape on both sides of the optical axis. The third lens 103 may be provided as a spherical lens made of glass. The fifth surface (S5) and the sixth surface (S6) may be spherical. At least one or both of the fifth surface S5 and the sixth surface S6 may be provided without a critical point from the optical axis OA to the end of the effective area.

The aperture ST may be disposed around the sensor side of the second lens 102. Alternatively, the aperture ST may be disposed around the object-side or sensor-side surface of the first lens 101, or around the object-side surface of the second lens 102. The composite focal length of the second to seventh lenses 102-107 may have a positive value, and TTL may be reduced within the angle of view range. The second lens 102 on the object side and the third lens 103 on the sensor side of the aperture ST may have a shape in which both sides are convex at the optical axis. Accordingly, the center distance between the second and

third lenses

102 and 103 may be reduced. Additionally, the center distance between the third and

fourth lenses

103 and 104 may be reduced depending on the shape of the third lens 103. Since the third lens 103 adjacent to the sensor side of the aperture ST has positive refractive power (F3 > 0), the third lens 103 can refract incident light in the optical axis direction. , it is possible to suppress an increase in the effective diameter of the sensors or rear lenses of the third lens 103. Accordingly, the third lens 103 can prevent a decrease in the yield by weight of the optical system and improve production efficiency. Here, the composite focal length of the third to seventh lenses 103-107 disposed on the sensor side of the aperture ST may have a positive value, and the TTL may be reduced within the angle of view range.

The fourth lens 104 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fourth lens 104 may have positive (+) refractive power. The fourth lens 104 may include plastic or glass. For example, the fourth lens 104 may be made of glass. Based on the optical axis, the object-side seventh surface S7 of the fourth lens 104 may be convex, and the sensor-side eighth surface S8 may have a concave shape. The fourth lens 104 may have a meniscus shape that is convex toward the object. Alternatively, the fourth lens 104 may have a meniscus shape with both sides convex at the optical axis OA or convex toward the sensor. Differently, at the optical axis OA, the seventh surface S7 may have a concave shape, and the eighth surface S8 may have a concave shape. Alternatively, the fourth lens 104 may have a meniscus shape that is convex toward the object. The fourth lens 104 may be provided as a spherical lens made of glass. The seventh surface (S7) and the eighth surface (S8) may be spherical. The seventh surface S7 and the eighth surface S8 may be provided without a critical point from the optical axis OA to the end of the effective area.

The fifth lens 105 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fifth lens 105 may have negative refractive power. The fifth lens 105 may include plastic or glass. For example, the fifth lens 105 may be made of glass. Based on the optical axis OA, the ninth surface on the object side of the fifth lens 105 may be convex, and the tenth surface S10 on the sensor side may be concave. The fifth lens 105 may have a meniscus shape convex from the optical axis OA toward the object. Alternatively, the fifth lens 105 may have a meniscus shape that is convex toward the sensor. Alternatively, the ninth surface at the optical axis OA may have a biconvex shape. Alternatively, the fifth lens 105 may have a concave shape on both sides of the optical axis. The ninth and tenth surfaces (S10) of the fifth lens 105 may be spherical. At least one or both of the ninth and tenth surfaces S10 may be provided without a critical point from the optical axis OA to the end of the effective area.

The fourth lens 104 and the fifth lens 105 may be bonded, and may be defined as a bonded lens 145. The bonding surface between the fourth lens 104 and the fifth lens 105 may be defined as the eighth surface S8. The eighth surface S8 may be the same as the ninth surface of the fifth lens 105. When the gap between the fourth and

fifth lenses

104 and 105 is G4, G4 may be less than 0.01 mm. The gap G4 between the fourth and

fifth lenses

104 and 105 may be less than 0.01 mm from the optical axis OA to the end of the effective area. The fourth and

fifth lenses

104 and 105 may have opposite refractive powers. The combined refractive power of the fourth and

fifth lenses

104 and 105 may have negative refractive power.

When the combined refractive power of the bonded lens 145 is F45, the combined refractive power of the first and

second lenses

101 and 102 is F12, and the combined refractive power of the third to seventh lenses 103-107 is F37, the absolute value is , the conditions F27 < F45 < F12 can be satisfied. The product of the refractive power of the fourth lens 104 and the fifth lens 105 of the bonded lens 145 may be less than 0. The product of the focal length of the fourth lens 104 and the focal length of the fifth lens 105 of the bonded lens 145 may be less than 0. Accordingly, the aberration characteristics of the optical system can be improved. If the refractive powers of the two lenses of the bonded lens 145 are the same, there is a limit to improving the aberration. The composite refractive power of the bonded lens 145 has negative refractive power, and the third lens 103 close to the object side and the sixth lens 106 close to the sensor side based on the bonded lens 145 have positive refractive power. You can have Accordingly, the third lens 103, the bonded lens 145, and the sixth lens 106 can refract some of the incident light in the optical axis direction and compensate for various aberrations.

The effective diameter of the fourth lens 104 may be larger than the effective diameter of the fifth lens 105 and may be larger than the diagonal length of the image sensor 300. The effective diameter of the fourth lens 104 is the average of the effective diameters of the seventh surface S7 and the eighth surface S8. The effective diameter of the fifth lens 105 is smaller than the effective diameter of the fourth lens 104 and may have a length within ±110% or ±105% of the diagonal length of the image sensor 300. Preferably, the effective diameter of the fifth lens 105 may be larger than the diagonal length of the image sensor 300, for example, 110% or less or 105% or less of the diagonal length of the image sensor 300.

The effective diameter of the eighth surface S8 of the fifth lens 105 may be larger than the diagonal length of the image sensor 300, and the effective diameter of the tenth surface S10 may be larger than the diagonal length of the image sensor 300. It can be small.

When the fifth and

sixth lenses

105 and 106 are spherical lenses, the difference between the effective diameter of the object-side seventh surface S7 and the sensor-side tenth surface S10 of the bonded lens 145 is the lens unit 100. ) can be provided in the largest possible way. When the effective diameter of the 9th surface of the fifth lens 105 and the effective diameter of the 10th surface (S10) on the sensor side are CA51 and CA52, the condition CA51 > CA52 is satisfied, and the difference between CA51 and CA52 is the difference between each lens. It may be the largest difference in effective diameter between the object side and the sensor side. Additionally, when the effective diameter of the seventh surface S7 of the fourth lens 104 and the effective diameter of the eighth surface S8 on the sensor side are CA41 and CA42, the condition CA41 > CA42 can be satisfied. Accordingly, an increase in the effective diameter of the sixth and

seventh lenses

106 and 107 can be prevented by the fifth lens 105, which has a relatively small effective diameter and a concave sensor side surface.

Since the bonded lens 145 is made of spherical glass lenses having different refractive indices, and at least one lens disposed on the sensor side of the bonded lens 145 is an aspherical lens, spherical aberration is prevented by the aspherical lens. Compensation is possible. In addition, at least one or two of the lenses disposed on the sensor side rather than the bonded lens 145 are aspherical lenses and have a small effective diameter, so they can refract light to the entire area of the image sensor 300 through the aspherical lens. . The refractive index of the fourth lens 104 is Nd4, the refractive index of the fifth lens 105 is Nd5, the Abbe number of the fourth lens 104 is Vd4, and the Abbe number of the fifth lens 105 is In the case of Vd5, the condition: Nd5*Vd5 < Nd4*Vd4 can be satisfied.

When the radius of curvature of the seventh surface (S7) on the object side of the bonded lens 145 is L4R1 and the radius of curvature of the tenth surface (S10) on the sensor side of the bonded lens 145 is L5R2, condition: |L4R1- L5R2| <10 mm, preferably |L4R1-L5R2| ≤ 6 mm can be satisfied. The shape of the object-side surface and the sensor-side surface of the bonded lens 145 has a meniscus shape convex from the optical axis to the object side, and by setting the difference in the radius of curvature between the object-side surface and the sensor-side surface to be small, the amount of incident light is reduced. In this way, the emitted light can be guided to the effective area of the sixth lens 106 with a small effective diameter. When the refractive index of the fifth lens 105 is Nd5 and the Abbe number is Vd5, and the refractive index of the first lens 101 is Nd1 and the Abbe number is Vd1, the conditions: Nd1 < Nd5, Nd5*Vd5 < Nd1*Vd1 You can be satisfied.

The sixth lens 106 may have positive (+) or negative (-) refractive power at the optical axis (OA). The sixth lens 106 may have positive (+) refractive power. The sixth lens 106 may include plastic or glass. For example, the sixth lens 106 may be made of glass. Based on the optical axis OA, the object-side 11th surface S11 of the sixth lens 106 may be convex and the sensor-side 12th surface S12 may be concave. 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 meniscus shape that is convex toward the sensor, or a shape that is convex on both sides. Alternatively, the sixth lens 106 may have a concave shape on both sides. The 11th surface (S11) and the 12th surface (S12) may be spherical. The 11th and 12th surfaces S11 and S12 of the sixth lens 106 may be provided without a critical point from the optical axis OA to the end of the effective area. Since the object side and the sensor side of the sixth lens 106 are provided without critical points, the effective diameter of the seventh lens 107 may not be increased. Additionally, due to the sixth lens 106, the difference between the effective diameter of the seventh lens 107 and the diagonal length of the image sensor 300 may not be large. When the effective diameter of the object-side 11th surface (S11) of the sixth lens 106 is CA61, and the effective diameter of the sensor-side 12th surface (S12) of the sixth lens 106 is CA62, condition: CA62 < CA61 can be satisfied. When the radius of curvature of the 11th surface (S11) on the object side of the sixth lens 106 is L6R1 and the radius of curvature of the 12th surface (S12) on the sensor side of the sixth lens 106 is L6R2, condition: CA61 *L6R1 < CA62*L6R2 can be satisfied. The central thickness of the sixth lens 106 is greater than that of the seventh lens 107 and the refractive index is low, thereby suppressing color dispersion.

The seventh lens 107 may have positive (+) or negative (-) refractive power at the optical axis (OA). The seventh lens 107 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. On the optical axis, the object-side 13th surface S13 of the seventh lens 107 may be convex, and the sensor-side 14th surface S14 may have a concave shape. The seventh lens 107 may have a meniscus shape convex from the optical axis toward the object. Differently, at the optical axis OA, the 13th surface S13 may have a concave shape, and the 14th surface S14 may have a convex shape. Alternatively, the seventh lens 107 may have a concave shape on both sides. The seventh lens 107 is made of plastic and may have aspherical surfaces on both sides. The 13th surface S13 and the 14th surface S14 have an aspherical surface, and aspheric coefficients may be provided as L7S1 and L7S2 in FIG. 4. The seventh lens 107 may be an aspherical lens closest to the image sensor 300. By arranging the aspherical lens closest to the image sensor 300, degradation of optical performance can be prevented, aberration characteristics can be improved, and the impact on resolution can be controlled. Additionally, by arranging the aspherical lens as the lens closest to the image sensor 300, it can be insensitive to assembly tolerances compared to the spherical lens. In other words, being insensitive to assembly tolerances means that optical performance may not be significantly affected even if the assembly is assembled with a slight difference compared to the design.

In the sixth lens 106, when the maximum Sag value on the object side is Sag61 and the maximum Sag value on the sensor side is Sag62, the condition of 0 < Sag61- Sag62 < 0.7mm can be satisfied. Accordingly, the difference in thickness between the center and edge portions of the sixth lens 106 is not large, and the influence on optical characteristics can be suppressed. In the seventh lens 107, when the maximum Sag value on the object side is Sag71 and the maximum Sag value on the sensor side is Sag72, 0 < |Sag71 |-|Sag72 | The condition of < 0.4mm can be satisfied. Accordingly, since the difference in thickness between the center and edge portions of the seventh lens 107 is not large and the radius of curvature is not large, the influence on optical characteristics can be suppressed. Since the first and

seventh lenses

101 and 107 are arranged as aspherical lenses, optical performance degradation can be prevented, the number of lenses can be reduced, and the TTL of the optical system can be reduced.

Referring to FIG. 2, at least one or both of the 13th surface S13 and the 14th surface S14 of the seventh lens 107 may have a critical point. The 13th surface S13 of the seventh lens 107 may have at least one critical point from the optical axis OA to the end of the effective area. Since the 13th surface S13 and the 14th surface S14 of the seventh lens 107 have critical points, light can be provided to the entire area of the image sensor 300. The critical point of the 13th surface S13 may be located 2.2 mm or less from the optical axis OA, for example, in the range of 1.5 mm to 2.2 mm. As another example, the 13th surface S13 may be provided without a critical point. The 14th surface S14 of the seventh lens 107 may have at least one critical point from the optical axis OA to the end of the effective area. The critical point of the 14th surface S14 may be located 2 mm or more from the optical axis OA, for example, in the range of 2 mm to 2.8 mm. Based on the optical axis, the critical point of the 14th surface S14 is located closer to the edge than the critical point of the 13th surface S13, so the 14th surface S14 transmits light to the periphery of the image sensor 300. It can be refracted.

Back focal length (BFL) is the optical axis distance from the surface of the image sensor 300 to the center of the sensor side of the last lens. A tangent line K1 passing through an arbitrary point of the 14th surface S14 of the seventh lens 107 and a normal line K2 perpendicular to the tangent line K1 have a predetermined angle θ1 with the optical axis OA. You can have The maximum tangent angle θ1 on the fourteenth surface S14 in the first direction CT7 is the center thickness of the seventh lens 107, and ET7 is the edge thickness of the seventh lens 107. CT6 is the center thickness of the sixth lens 106, and ET6 is the edge thickness of the sixth lens 106. The edge thickness is the distance in the optical axis direction between the object side and the sensor side at the end of the effective area of each lens. CG6 is the optical axis distance (ie, center spacing) from the center of the sixth lens 106 to the center of the seventh lens 107. That is, CG6 is the distance from the center of the 12th surface (S12) to the center of the 13th surface (S13). EG6 is the distance (ie, edge spacing) in the optical axis direction from the edge of the sixth lens 106 to the edge of the seventh lens 107. The central thickness of the bonded lens 145 is CT45, which is the optical axis distance from the center of the object-side surface of the fourth lens 104 to the center of the sensor-side surface of the fifth lens 105. The edge thickness of the bonded lens 145 is ET45, which is the optical axis distance from the edge of the object-side surface of the fourth lens 104 to the edge of the sensor-side surface of the fifth lens 105.

The Sag value of the object-side surface of the fourth lens 104 is Sag41, the Sag value of the sensor-side surface of the fifth lens 105 is Sag51, and the Sag value of the object-side surface of the sixth lens 106 is Sga61. The Sag value of the sensor side of the sixth lens 106 is Sga62, the Sag value of the object side of the seventh lens 107 is Sag71, and the Sag value of the sensor side of the seventh lens 107 is Sga62. In the case of Sga72, the conditions of Max_Sag52 < Max_Sag41 can be satisfied in absolute values, the conditions of Max_Sag61 < Max_Sag52 can be satisfied, and the conditions of Max_Sag72 < Max_Sag 71 < Max_Sag52 < Sag41 can be satisfied. In this way, by adjusting the lens surface from the center to the edge of the fifth to seventh lenses 105-107, incident light can be guided to the entire area of the image sensor 300. Here, the Max_Sag value is the maximum distance in the optical axis direction from the straight line perpendicular to the center of the object side or sensor side of each lens to the lens surface, and the Sag value is a negative value when located on the object side rather than the center. It can have a positive value if it is located on the sensor side rather than the center.

Figure 3 is an example of lens data of the optical system of the embodiment of Figure 1. As shown in Figure 3, the radius of curvature at the optical axis (OA) of the first to seventh lenses 101-107, the central thickness (CT) of each lens, and the center spacing between adjacent lenses (CG) ), the size of the refractive index, Abbe Number, and effective radius (Semi-aperture) in the d-line can be set. If the radius of curvature of each lens on the optical axis is expressed as an absolute value, the radius of curvature of the eighth surface S4 of the fourth lens 104 on the optical axis OA is the largest among the lenses, and the radius of curvature of the eighth surface S4 of the fourth lens 104 is the largest among the lenses, and the radius of curvature of the eighth surface S4 of the fifth lens 105 is the largest among the lenses. The radius of curvature of surface S10 may be the smallest among lenses. The difference between the maximum radius of curvature and the minimum radius of curvature may be 10 times or more, for example, 15 times or more.

If the radius of curvature of each lens on the optical axis is expressed as an absolute value, the radius of curvature of the first lens 101 on the optical axis is equal to the radius of curvature of the second lens 102 disposed on the sensor side of the aperture ST and the object side. It may be smaller than the radius of curvature of the disposed third lens 103. Here, the radius of curvature is the average of the absolute values of the radii of curvature of the object-side surface and the sensor-side surface of each lens. The absolute value of the radius of curvature of the object-side surface of the ith lens is Roi, the absolute value of the sensor-side radius of curvature is Rsi, and the absolute value of the average of the object-side surface and the sensor-side surface is Ri, (Roi-Rsi )/Ri may be minimum when i is 6 and maximum when i is 3. Here, when i is 6,7, the value of (Roi-Rsi)/Ri may be 0.5 or less. Accordingly, the difference in the radius of curvature of the seventh lens 107 made of plastic between the object-side surface and the sensor-side surface is smaller than the difference in the radius of curvature between the object-side surface and the sensor-side surface of the first to fifth lenses 101-105. You can.

The radius of curvature of the sixth lens 106 on the optical axis may be smaller than the radius of curvature of the first lens 101. Since the sixth lens 106 is spherical and has a radius of curvature smaller than that of the first lens 101, the entire area can be provided with uniform light distribution. The radius of curvature of the seventh lens 107 on the optical axis may be smaller than the radius of curvature of the first lens 101. Since the seventh lens 107 is aspherical and has a radius of curvature smaller than that of the first lens 101, the entire area can be provided with uniform light distribution.

The absolute value of the radius of curvature of the object-side surface of the ith lens is Roi, the absolute value of the sensor-side radius of curvature is Rsi, the absolute value of the average of the object-side surface and the sensor-side surface is Ri, and the value of Roi/Rsi is The value can be largest when i is 5 and smallest when i is 3.

The radii of curvature of the first and second surfaces (S1 and S2) of the first lens 101 are defined as L1R1 and L1R2, and the radii of curvature of the 13th and 14th surfaces (S13 and S14) of the seventh lens 107 are defined as L1R1 and L1R2. are defined as L7R1 and L7R2, and the radii of curvature of each lens surface of the second to sixth lenses 102-106 are defined as L2R1, L2R2, L3R1, L3R2, L4R1, L4R2 (L5R1), L5R2, L6R1, and L6R2. It can be defined. The ratio of the radius of curvature of the object-side surface of each lens to the radius of curvature of the sensor-side surface may satisfy the following conditions.

Condition 1: 1.5 < |L1R1/L1R2| < 3, condition 2: 0 < |L2R1/L2R2| < 0.5

Condition 3: 0 < L3R1/L3R2 < 0.2, Condition 4: 0 < L4R1/L4R2 < 0.3

Condition 5: 10 < L5R1/L5R2 < 30, Condition 6: 0 < L6R1/L6R2 < 1

Condition 7: 1 < L7R1/L7R2 < 2.2

When the center thickness of the first to seventh lenses 101-107 is defined as CT1-CT7 and the edge thickness of the first to seventh lenses 101-107 is defined as ET1-ET7, the first to seventh lenses 101-107 are defined as CT1-CT7. The sum of the center thicknesses of the seventh lenses 101-107 may be defined as ∑CT, and the sum of the edge thicknesses of the first to seventh lenses 101-107 may be defined as ∑ET. To describe the thickness of the lenses, the central thickness (CT1) of the first lens 101 may be greater than the central thickness (CT2-CT7) of the second to seventh lenses (102-107), and the lens unit 100 ) can have a maximum thickness within. The seventh lens 107 may have the smallest central thickness (CT7) within the lens unit 100 and may satisfy the condition of CT7 < CT4 < CT6 < CT1. The ratio of the center thickness and edge thickness of each lens may satisfy the following conditions.

Condition 1: 0.6 < CT1/ET1 < 1.2, Condition 2: 1 < CT2/ET2 < 2

Condition 3: 1.2 < CT3/ET3 < 2.5, Condition 4: 1.5 < CT4/ET4 < 3

Condition 5: 0 < CT5/ET5 < 1.2, Condition 6: 0.6 < CT6/ET6 < 2

Condition 7: 0.4 < CT7/ET7 < 1.2, Condition 8: 0.5 < ∑CT/∑ET < 1.2 or 1 < ∑CT/∑ET < 1.2

Under the above conditions, light can be effectively guided without increasing the difference between the center thickness and edge thickness of each lens. Additionally, the difference between the maximum and minimum center thickness in the lenses may be 3 mm or more, for example, in the range of 3 mm to 5 mm. That is, even if the center thickness of the last aspherical lens is provided thin, optical performance may not deteriorate, and the camera module can be provided with a slim thickness.

The relationship between the center of each lens and TTL may satisfy the following conditions.

Condition 1: 0.10 < CT1/TTL < 0.3, preferably, Condition 1 can satisfy 0.10 ≤ CT1/TTL ≤ 0.2.

Condition 2: 0 < CT2/TTL < 0.1, Condition 3: 0 < CT3/TTL < 0.09

Condition 4: 0 < CT4/TTL < 0.1, Condition 5: 0 < CT5/TTL < 0.1

Condition 6: 0.05 < CT6/TTL < 0.2, Condition 7: 0 < CT7/TTL < 0.07

The ratio of CT1/TTL in condition 1 may be greater than the values in conditions 2 to 7. The central thickness CT1 of the first lens 101 may be greater than the sum of the central thicknesses of the adjacent second and third lenses.

The relationship between the bonded lens 145 and the first and

sixth lenses

101 and 106 may satisfy the following conditions. Condition 1: 0.4 < CT1/CT45 < 1.2 or 0.4 < CT1/CT45 < 1

Condition 2: 1 < CT1/CT6 < 1.8, Condition 3: 0.1 < CT1/∑CT < 0.4

Condition 4: 0.10 < CT45/∑CT < 0.3, Condition 5: 0.15 < CT6/∑CT < 0.35

∑CT is the sum of the central thicknesses of the lenses, and CT45 is the sum of the central thicknesses of the 4th and 5th lenses. By setting the center thickness and edge thickness of the first to seventh lenses 101-107 to the above conditions, light is routed to an optimal path according to the refractive index, Abbe number, and radius of curvature of each lens within the optical system 1000. can guide you.

The center spacing between the first to seventh lenses 101-107 can be defined as CG1-CG6, and the sum of the center spacings between the first to seventh lenses 101-107 can be defined as ∑CG. there is. Here, the center spacing between lenses is explained excluding the spacing between two lenses in a bonded lens. The center distance CG1 between the first and

second lenses

101 and 102 is maximum, and the center distance CG3 between the third and

fourth lenses

103 and 104 is minimum. The center spacing between the spherical lenses and the aspherical lenses is greater than the center spacing between the spherical lenses. The center thickness of each lens and the center distance between adjacent lenses may satisfy the following conditions. Condition 1: 0 < CT1/CG1 < 1, Condition 2: 2 < CT2/CG2 < 10, Condition 3: 5 < CT3 / CG3 < 20, Condition 4: 4 < CT45/CG5 < 12, Condition 5: 0.5 < CG1 /∑CG < 1

By providing the maximum center thickness between the lenses to be smaller than the maximum center spacing, it is possible to provide a camera module with an aspherical lens applied to the output side of the optical system without increasing the center spacing of other lenses. The center gap CG1 between the first and

second lenses

101 and 102 may be greater than the sum of the center thicknesses of the two adjacent lenses. In addition, the center spacing (CG1) between the first and

second lenses

101 and 102 is CT2+CT3+CT4 < CG1, CT3+CT4+CT5 < CG1, CT4+CT5+CT6 < CG1, CT5+CT6+CT7 < CG1. The conditions can be satisfied. The center distance CG1 between the first and

second lenses

101 and 102 may be 1.5 times or more than the center thickness of the bonded lens 145. Since the center distance CG1 between the first and

second lenses

101 and 102 satisfies the above conditions, it can be easy to control the optical characteristics of the second to seventh lenses 102-107. Here, if the ith center spacing between two adjacent lenses is defined as CGi, and the center thickness of the ith lens disposed on the object side than the CGi is defined as CTi, the following conditions can be satisfied (where , center thickness of bonded lenses and spacing between bonded lenses are excluded). CGi is the center distance between the ith lens and the i+1 lens. The ratio of CTi/CGi is minimum when i is 1 and can be maximum when i is 3.

When explaining the effective diameter, the lens with the maximum effective diameter may be the first lens 101 that is closest to the object. The first lens 101 having the maximum effective diameter may be a spherical lens. The lens with the minimum effective diameter may be the lens closest to the image sensor 300, for example, the seventh lens 107. The effective diameters of the first lens 101 to the seventh lens 107 can be defined as CA1, CA2, CA3, CA4, CA5, CA6, and CA7, and the first and second surfaces of the first lens 101 ( The effective diameters of S1 and S2) can be defined as CA11 and CA12, and the effective diameters of the 13th and 14th surfaces (S13 and S14) of the seventh lens 107 can be defined as CA71 and CA72. The effective diameters of the object side and sensor side of the sixth lens can be defined as CA21, CA22, CA31, CA32, CA41, CA42, CA51, CA52, CA61, and CA62. The effective diameter can satisfy the following conditions.

Condition 1: CA22 < CA12, Condition 2: CA71 < CA72, Condition 3: CA31 < CA22, Condition 4: CA61 < CA51 < CA41

When explaining the refractive index, the refractive index of the fifth lens 105 is the highest among lenses and may be greater than 1.70, for example, 1.75 or greater. The refractive index of the first lens 101 is the smallest among the lenses. The difference between the maximum refractive index and the minimum refractive index may be 0.20 or more, for example, 0.25 or more. By adjusting the refractive index of the spherical lens and the aspherical lens, incident efficiency can be increased and the incident light can be guided to the image sensor 300.

Explaining the Abbe number, the Abbe number of the first lens 101 is the largest among lenses and may be 55 or more. The Abbe number of the first to fourth lenses 111 to 114 may be 50 or more, and the difference between them may be 10 or less. The Abbe number of the seventh lens 107 is the smallest among the lenses. The difference between the maximum Abbe number and the minimum Abbe number may be 30 or more. The Abbe number of the third and

fourth lenses

103 and 104 adjacent to the aperture ST is larger than that of the fifth lens 105, and the Abbe number of the aspherical seventh lens 107 closest to the image sensor 300 By providing the smallest possible color dispersion of light traveling between glass lenses, the color dispersion between the spherical lens and the aspherical lens can be increased to guide the light to the image sensor 300.

The effective diameter average of a spherical lens is SSL_CA_Aver, and if the effective diameter average of an aspherical lens is ASL_CA_Aver, the condition of ASL_CA_Aver < SSL_CA_Aver can be satisfied. The average of the center thickness of the spherical lens is SSL_CT_Aver, and if the average of the center thickness of the aspherical lens is ASL_CT_Aver, the condition of SSL_CT_Aver < ASL_CT_Aver can be satisfied.

If the average refractive index of a spherical lens is SSL_Nd_Aver, and the average refractive index of an aspherical lens is ASL_Nd_Aver, the condition of ASL_Nd_Aver < SSL_Nd_Aver can be satisfied.

If the average Abbe number of a spherical lens is SSL_Ad_Aver, and the average Abbe number of an aspherical lens is ASL_Ad_Aver, the condition of ASL_Ad_Aver < SSL_Ad_Aver can be satisfied.

The focal lengths F1, F5, and F7 of the first, fifth, and seventh lenses (101, 105, and 107) have negative refractive power, and the focal lengths (F2, F3, and F4) of the second, third, and sixth lenses (102, 103, 104, and 106) have negative refractive power. ,F6) may have positive refractive power. Additionally, the sixth and

seventh lenses

106 and 107, which are adjacent lenses, 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

Here, since the sixth lens 106 has positive refractive power and the seventh lens 107 has negative refractive power, according to

conditions

1 and 2, the refractive index of the sixth lens 106 is equal to that of the seventh lens. It is smaller than the refractive index of (107), and the dispersion value of the sixth lens 106 is greater than that of the seventh lens 107. Chromatic aberration occurring in the fourth and fifth lenses can be corrected with the seventh lens having an aspheric surface. In addition, by satisfying the refractive index difference between the 6th and

7th lenses

106 and 107 arranged in succession of 0.2 or less and the Abbe number difference of 20 or more and 60 or less, chromatic aberration occurring in the spherical lens can be compensated for with the aspherical lens.

The optical system 1000 generates chromatic aberration, and the chromatic aberration is corrected using a bonded lens 145 or two lenses arranged in series. As the temperature changes from low to high, the lens repeats contraction and expansion. Since lenses made of the same material have the same amount of change in lens characteristics due to temperature changes, it is effective to correct chromatic aberration between lenses made of the same material even if the temperature changes. The 4th, 5th, and

6th lenses

104, 105, and 106 and the 7th lens 107 can be used to mutually correct chromatic aberration between the spherical lens and the aspherical lens. The refractive index difference between the fourth lens 104 and the fifth lens 105, which are bonded lenses, satisfies 0.01 to 0.30, the Abbe number difference satisfies 20 to 45, and the chromatic aberration occurring in spherical lenses is satisfied by spherical You can compensate with a lens. The difference in refractive index is rounded to the third decimal place, and the Abbe number difference is rounded to the first decimal place to compare values. In addition, by arranging glass lenses with a relatively high Abbe number on the object side of the seventh lens 107 having an aspherical surface, chromatic dispersion can be reduced by the glass lenses and chromatic dispersion can be increased by the last aspherical lens. .

If the focal length is expressed as an absolute value, the focal length of the first lens 101 may be 40 or more. The focal length of the fifth lens 105 is the smallest among the lenses. The focal length of the seventh lens 107 is the largest among the lenses and is 65 or more. The difference between the maximum and minimum focus distances may be 55 or more. By providing the largest focal length of the lens closest to the sensor and the smallest focal length of the bonded fifth lens 105, it is possible to have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. in the field of view range set in the optical system. and can have good optical performance at the periphery of the angle of view. On the sensor side of the seventh lens 107, the Sag value increases from the optical axis to a point of 2.4 mm ± 0.4 mm in a direction perpendicular to the optical axis, and then decreases from the point of 2.4 mm ± 0.4 mm toward the edge. . If a critical point exists on the sensor side of the seventh lens 107, that is, the sensor side of the last lens, that is, the lens side closest to the sensor, the TTL can be reduced, making it easy to miniaturize and lighten the optical system.

As shown in FIG. 4 , the lens surfaces of the first and

seventh lenses

101 and 107 among the lenses of the lens unit 100 in the first embodiment may include an aspherical surface with a 30th order aspheric coefficient. For example, the first and

seventh lenses

101 and 107 may include lens surfaces having a 30th order aspherical coefficient. As described above, an aspheric surface with a 30th order aspherical coefficient (a value other than “0”) can particularly significantly change the aspheric shape of the peripheral area, so the optical performance of the peripheral area of the field of view (FOV) can be well corrected. As shown in Figure 5, the thickness (T1-T7) of the first to seventh lenses (101-107) and the gap (G1-G6) between two adjacent lenses can be set. As shown in Figure 5, the thickness of each lens (T1-T7) in the Y-axis direction perpendicular to the optical axis can be expressed at intervals of 0.1 mm or 0.2 mm or more from the optical axis, and the distance between each lens (G1-G6) is from the optical axis. It can be displayed at intervals of 0.1mm or 0.2mm or more.

The center thickness (CT45) of the bonded lens 145 may be greater than the edge thickness (ET45). The central thickness CT45 of the bonded lens 145 is the distance in the optical axis direction from the center of the object-side seventh surface S7 of the fourth lens 104 to the center of the tenth surface S10 of the fifth lens 105. , and the edge thickness ET45 is the distance in the optical axis direction from the end of the effective area of the seventh surface S7 to the tenth surface S10. The maximum thickness of the bonded lens 145 is at the center, the minimum thickness is at the edge, and the maximum thickness may be at least 1 times the minimum thickness, for example, in the range of 1 to 1.5 times. The maximum thickness of the sixth lens 106 is at the center, the minimum thickness is at the edge, and the maximum thickness may be 1.5 times or less than the minimum thickness. The maximum thickness of the seventh lens 107 is at the edge, the minimum thickness is at the center, and the maximum thickness may be 1.5 times or less than the minimum thickness.

As shown in FIG. 6 , the chief ray angle (CRA) in the optical system and camera module of FIG. 1 may be 10 degrees or more, for example, in the range of 10 degrees to 35 degrees or in the range of 10 degrees to 25 degrees. 20 is a graph showing the ambient light ratio or relative illumination according to the image height in the optical system according to the embodiment, showing temperature changes of room temperature (Room_temp), low temperature (Low_temp), and high temperature (High_tmep). Accordingly, it can be seen that the peripheral light ratio is more than 80%, for example, more than 84% from the center of the image sensor to the end of the diagonal. In other words, it can be seen that there is almost no difference in ambient illuminance due to temperature change up to 4.6mm from the optical axis.

FIGS. 7 to 9 are graphs showing diffraction MTF (modulation transfer function) at room temperature, low temperature, and high temperature in the optical system of FIG. 1, and are graphs showing luminance ratio (modulation) according to spatial frequency. 7 to 9, in the first embodiment of the invention, the deviation of MTF from low or high temperature based on room temperature may be less than 10%, that is, 7% or less.

Figures 10 to 12 are graphs showing aberration characteristics at room temperature, low temperature, and high temperature in the optical system of Figure 1. 10 to 12 are graphs measuring spherical aberration, astigmatic field curves, and distortion from left to right. 10 to 12, the X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. In addition, the graph for spherical aberration is a graph for light in the wavelength band of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graph for astigmatism and distortion is a graph for light in the wavelength band of about 546 nm. . In the aberration diagrams of FIGS. 10 to 12, it can be interpreted that the closer each curve at room temperature, low temperature, and high temperature is to the Y-axis, the better the aberration correction function is. The optical system 1000 according to the embodiment has an aberration correction function in most areas. You can see that the measured values 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). Here, the low temperature is -20 degrees or lower, for example, in the range of -20 to -40 degrees, the room temperature is in the range of 22 degrees ± 5 degrees or 18 to 27 degrees, and the high temperature is 85 degrees or higher, for example, in the range of 85 to 105 degrees. It can be. Accordingly, it can be seen that the decrease in luminance ratio (modulation) from the low temperature to the high temperature in FIGS. 10 to 12 is less than 10%, for example, 5% or less, or is almost unchanged.

Table 1 compares changes in optical properties such as EFL, BFL, F number, TTL, and FOV in the diagonal direction at room temperature, low temperature, and high temperature in the optical system according to the first embodiment, and shows the optical properties at low temperature based on room temperature. It can be seen that the rate of change is 5% or less, for example, 3% or less, and the change rate of optical properties at low temperatures based on room temperature is 5% or less, for example, 3% or less.

	상온room temperature	저온low temperature	고온High temperature	저온/상온(%)Low temperature/room temperature (%)	고온/상온(%)High temperature/room temperature (%)
EFLEFL	15.215.2	15.215.2	15.215.2	99.87%99.87%	100.18%100.18%
BFLBFL	2.62.6	2.62.6	2.62.6	99.88%99.88%	100.14%100.14%
F#F#	1.61.6	1.61.6	1.61.6	100.00%100.00%	100.00%100.00%
TTLTTL	3939	3939	3939	99.90%99.90%	100.12%100.12%
FOVFOV	24.124.1	24.224.2	24.124.1	100.11%100.11%	99.86%99.86%

Therefore, as shown in Table 1, the change in optical properties according to the temperature change from low to high temperature, for example, the rate of change in effective focal length (EFL), TTL, BFL, F number (F#), and diagonal angle of view (FOV) is 10. It can be seen that it is % or less, that is, 5% or less, for example, in the range of 0 to 5%. Even if at least one or two aspherical lenses are used, temperature compensation for the aspherical lenses is designed to prevent deterioration in the reliability of optical characteristics. In addition, it can be seen that the effective focal length, TTL, BFL, F number (F#), diagonal angle of view (FOV), etc. are almost unchanged even if the temperature changes from room temperature to low or high temperature. The optical system of the embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the center but also in the periphery of the field of view (FOV).

The optical system according to the second embodiment of the invention will be described with reference to FIGS. 13 to 18. The configuration of the second embodiment will refer to the first embodiment, and the configuration different from the first embodiment will be described. 13 and 14, the optical system 1000 according to the second embodiment includes a lens unit 100A, and the lens unit 100A includes first lenses 111 to 7 lenses 117. It can be included. The first and

second lenses

111 and 112 may be a first lens group (LG1), and the third to seventh lenses (113, 114, 115, 116, and 117) may be a second lens group (LG2).

The first lens 111 has negative refractive power and may be made of glass. With respect to the optical axis, the object-side first surface S1 of the first lens 111 may be concave, and the sensor-side second surface S2 may have a concave shape. The first lens 111 is made of aspherical glass, has high transmittance and refractive index, and is provided with a large thickness, thereby preventing deterioration of the optical characteristics of the lens on the entrance side and protecting the surface.

The second lens 112 has positive refractive power at the optical axis OA and may be made of a spherical glass material. With respect to the optical axis OA, the third surface S3 of the second lens 112 may be convex, and the fourth surface S4 may have a convex shape. The aperture ST may be disposed around the sensor side of the second lens 112. The third lens 113 has positive refractive power at the optical axis OA and may include a glass material. Based on the optical axis, the object-side fifth surface S5 of the third lens 113 may be convex, and the sensor-side sixth surface S6 may have a concave shape. The third lens 113 may be provided as a spherical lens made of glass.

The fourth lens 114 has positive refractive power at the optical axis OA and may include a spherical glass material. Based on the optical axis, the object-side seventh surface S7 of the fourth lens 114 may be convex, and the sensor-side eighth surface S8 may have a concave shape. The fifth lens 115 has negative refractive power at the optical axis OA and may be made of a spherical glass material. Based on the optical axis OA, the ninth surface on the object side of the fifth lens 115 may be convex, and the tenth surface S10 on the sensor side may be concave. The fourth lens 114 and the fifth lens 115 may be bonded, and may be defined as a bonded lens 145A. The fourth and

fifth lenses

114 and 115 may have opposite refractive powers. The combined refractive power of the fourth and

fifth lenses

114 and 115 may have positive refractive power. When the combined refractive power of the bonded lens 145A is F45, the combined refractive power of the first and

second lenses

101 and 102 is F12, and the combined refractive power of the third to seventh lenses 103-107 is F37, the absolute value is , the conditions F37 < F45 < F12 can be satisfied.

The effective diameter of the fourth lens 114 may be larger than the diagonal length of the image sensor 300. The effective diameter of the fifth lens 115 is smaller than the effective diameter of the fourth lens 114 and may have a length within ±110% of the diagonal length of the image sensor 300. For example, the effective diameter of the tenth surface S10 of the fifth lens 115 may be smaller than the diagonal length of the image sensor 300. Since the position of the bonded lens 145A is located between the spherical lens and the spherical lens, chromatic aberration correction by the seventh lens 117 can be more efficient.

The sixth lens 116 has positive refractive power at the optical axis OA and may be made of glass. Based on the optical axis OA, the object-side 11th surface S11 of the sixth lens 116 may be convex, and the sensor-side 12th surface S12 may be concave. The sixth lens 116 may be made of glass and have spherical surfaces on both sides. Since the 11th surface (S11) and the 12th surface (S12) are made of a spherical glass material, the refractive efficiency of light can be improved, and the assembly efficiency can be improved by increasing the thickness. In addition, the sixth lens 116 made of glass and having a large thickness provides thermal compensation according to temperature changes, thereby preventing deterioration of optical properties. Since the sixth lens 116 is disposed between the spherical lens and the aspherical lens, it is possible to prevent degradation of optical performance, improve aberration characteristics, and control the impact on resolution. The seventh lens 117 has negative refractive power on the optical axis and may be provided as an aspherical plastic lens. On the optical axis, the object-side 13th surface S13 of the seventh lens 117 may be convex, and the sensor-side 14th surface S14 may have a concave shape. The seventh lens 117 is made of plastic and may have aspherical surfaces on both sides.

The first and second surfaces (S1, S2) of the first lens 111, and the 13th surface (S13) and the 14th surface (S14) of the seventh lens 117 have aspherical surfaces, and the aspherical coefficient is shown in Figure 1. It can be provided together with L1 of 15 and S1 and S2 of L7.

The 13th surface S13 of the seventh lens 117 may have at least one critical point from the optical axis OA to the end of the effective area. The critical point of the 13th surface S13 may be located 2.5 mm or less from the optical axis OA, for example, in the range of 1.7 mm to 2.5 mm. As another example, the 13th surface S13 may be provided without a critical point. The 14th surface S14 of the seventh lens 117 may have at least one critical point from the optical axis OA to the end of the effective area. The critical point of the 14th surface S14 may be located closer to the edge than the critical point of the 13th surface S13, and may be located 2.5 mm or more from the optical axis OA, for example, in the range of 2.5 mm to 3.3 mm. Since the 14th surface S14 and the 13th surface S13 have critical points, incident light can be refracted to the periphery of the image sensor 300. In the seventh lens 117, when the maximum Sag value on the object side is Sag71 and the maximum Sag value on the sensor side is Sag72, 0 < |Sag71 |-|Sag72 | The condition of < 0.4mm can be satisfied. Accordingly, since the difference in thickness between the center and edge portions of the seventh lens 117 is not large and the radius of curvature is not large, the influence on optical characteristics can be suppressed. Since the seventh lens 117 is arranged as a spherical lens, it is resistant to temperature changes, the number of lenses can be reduced, and the TTL of the optical system can be reduced.

FIG. 14 is an example of lens data of the optical system of the embodiment of FIG. 13. As shown in Figure 14, the radius of curvature at the optical axis (OA) of the first to seventh lenses (111-117), the central thickness (CT) of the lens, the center spacing (CG) between adjacent lenses, and the d-line The size of the refractive index, Abbe Number, and clear aperture (CA) can be set. The absolute value of the radius of curvature of the first lens 111 on the optical axis may be smaller than the absolute value of the radius of curvature of the second lens 112 disposed on the object side of the aperture ST. The absolute value of the radius of curvature of the object-side surface of the ith lens is Roi, the absolute value of the sensor-side radius of curvature is Rsi, and the absolute value of the average of the object-side surface and the sensor-side surface is Ri, (Roi-Rsi )/Ri may be minimum when i is 7 and maximum when i is 3. Here, when i is 6,7, the value of (Roi-Rsi)/Ri may be less than 1, for example, 0.8 or less. Accordingly, the difference between the curvature radii of the object-side surface and the sensor-side surface of each of the plurality of aspherical lenses and the average of the curvature radii of each aspherical lens may be smaller than that of the spherical lenses. Since the first lens 111 is provided as an aspherical lens with a large thickness, the radius of curvature at the optical axis of the first lens 111 can be increased than the radius of curvature of the sixth and

seventh lenses

116 and 117, and the object side The difference in the radius of curvature between the surface and the sensor side may not be large, and assembly efficiency may be improved.

The radius of curvature of the seventh lens 117 on the optical axis may be smaller than the radius of curvature of the aspherical first lens 111. Accordingly, the aspherical seventh lens 117 can guide light incident through the first to fifth lenses 111-115 to the entire area of the image sensor 300. The ratio of the radius of curvature of each lens may satisfy the following conditions.

Condition 1: 0 < |L1R1/L1R2| < 1.2, condition 2: 0 < |L2R1/L2R2| < 0.5

Condition 3: 0 < L3R1/L3R2 < 0.2, Condition 4: 0 < L4R1/L4R2 < 0.3

Condition 5: 10 < L5R1/L5R2 < 30, Condition 6: 0 < L6R1/L6R2 < 1

Condition 7: 1 < L7R1/L7R2 < 2.2

To describe the thickness of the lenses, the central thickness CT6 of the sixth lens 116 may have the maximum thickness within the lens unit 100A. The central thickness CT1 of the first lens 111 may be greater than that of the second to fourth lenses 112 - 114 and greater than the central thickness of the seventh lens 117 . The center thickness CT7 of the seventh lens 117 may have the minimum thickness within the lens unit 100A. The central thickness CT1 of the first lens 111 may be smaller than the central thickness CT45 of the bonded lens 145A. The edge thickness ET1 of the first lens 111 may be smaller than the edge thickness ET45 of the bonded lens 145A. The center thickness and edge thickness of each lens may satisfy the following conditions.

Condition 1: 0.6 < CT1/ET1 < 1.2, Condition 2: 1 < CT2/ET2 < 3

Condition 3: 1.3 < CT3/ET3 < 3, Condition 4: 1.5 < CT4/ET4 < 3

Condition 5: 0 < CT5/ET5 < 1, Condition 6: 0.6 < CT6/ET6 < 1.5

Condition 7: 0.3 < CT7/ET7 < 1.2, Condition 8: 0.8 < ∑CT/∑ET < 1.5 or 1 < ∑CT/∑ET < 1.5

The center distance CG1 between the first and

second lenses

111 and 112 is the maximum, and may be the center distance between the object-side aspherical lens and the sensor-side spherical lens. The center distance CG1 between the first and

second lenses

111 and 112 may be greater than the center distance between the spherical lenses and greater than the center distance between the object-side spherical lens and the sensor-side aspherical lens. The center distance CG6 between the sixth lens 116 and the seventh lens 117 may satisfy the condition of CG6 < CG5 < CG1. The center thickness of each lens and the center distance between adjacent lenses may satisfy the following conditions.

Condition 1: 0 < CT1/CG1 < 0.5, Condition 2: 2 ≤ CT2/CG2 < 5

Condition 3: 5 < CT3/CG3 < 15, Condition 4: 4 < CT45/CG5 < 12

Condition 5: 0.5 < CG1/∑CG < 1

second lenses

111 and 112 may be greater than the sum of the center thicknesses of the two adjacent lenses. In addition, the center spacing (CG1) between the first and

second lenses

111 and 112 is CT2+CT3+CT4 < CG1, CT3+CT4+CT5 < CG1, CT4+CT5+CT6 < CG1, CT5+CT6+CT7 < CG1. The conditions can be satisfied. The center distance CG1 between the first and

second lenses

111 and 112 may be 1.5 times or more than the center thickness of the bonded lens 145. Since the center distance CG1 between the first and

second lenses

111 and 112 satisfies the above conditions, it can be easy to control the optical characteristics of the second to seventh lenses 112-117. Here, if the ith center spacing among the center spacings of two adjacent lenses is defined as CGi, and the center thickness of the ith lens disposed on the object side than the CGi is defined as CTi, the following conditions can be satisfied. (Here, the thickness of the bonded lens and the gap between bonded lenses are excluded)

The ratio of CTi/CGi is minimum when i is 1, and may be minimum when i is 3.

The relationship between the center thickness of each lens and TTL may satisfy the following conditions.

Condition 1: 0.01 < CT1/TTL < 0.1, Condition 2: 0 < CT2/TTL < 0.1

Condition 3: 0 < CT3/TTL < 0.1, Condition 4: 0 < CT4/TTL < 0.1

Condition 5: 0 < CT5/TTL < 0.1, Condition 6: 0.1 < CT6/TTL < 0.2

Condition 7: 0 < CT7/TTL < 0.07

The ratio of CT1/TTL in condition 6 may be greater than the values of other conditions.

When explaining the effective diameter, the lens with the maximum effective diameter may be the first lens 111. The first lens 111 having the maximum effective diameter may be a spherical lens. The lens with the minimum effective diameter may be the lens closest to the image sensor 300, for example, the seventh lens 117. The effective diameter of each lens can satisfy the following conditions.

Condition 1: CA22 < CA12, Condition 2: CA71 < CA72, Condition 3: CA22 < CA31

Condition 4: CA61 < CA51 < CA41, Condition 5: CA4 < CA2 < CA1, Condition 6: CA5<CA4<CA3

When explaining the refractive index, the refractive index of the fifth lens 115 is the highest among lenses and may be greater than 1.70, for example, 1.80 or greater. The refractive index of the first lens 111 is the smallest among the lenses. The difference between the maximum refractive index and the minimum refractive index may be 0.20 or more, for example, 0.25 or more. By adjusting the refractive index of the spherical lens and the aspherical lens, incident efficiency can be increased and the incident light can be guided to the image sensor 300. When explaining the Abbe number, the Abbe number of the first lens 111 is the largest among lenses and may be 55 or more. The difference in Abbe numbers between the first to fourth lenses 111 to 114 may be 10 or less. The Abbe number of the seventh lens 117 is the smallest among the lenses. The difference between the maximum Abbe number and the minimum Abbe number may be 30 or more.

The optical system 1000 generates chromatic aberration, and the chromatic aberration is corrected using a bonded lens 145A or two lenses arranged in series. As the temperature changes from low to high, the lens repeats contraction and expansion. Since lenses made of the same material have the same amount of change in lens characteristics due to temperature changes, it is effective to correct chromatic aberration between lenses made of the same material even if the temperature changes.

If the focal length is expressed as an absolute value, the focal length of the first lens 101 may be 40 or more. The focal length of the seventh lens 117 is the largest among lenses and may be 40 or more. The focal length of the fifth lens 115 is the smallest among the lenses. The focal length difference between the first and

seventh lenses

111 and 117 may be 10 or less. The difference between the maximum and minimum focus distances may be 35 or more. By increasing the focal length of the first lens 111 closest to the object and the seventh lens 117 closest to the sensor, and providing small focal lengths of other lenses, improved MTF characteristics and aberration control in the field of view range set in the optical system characteristics, resolution characteristics, etc., and can have good optical performance in the periphery of the angle of view. The critical points and Sag values of the object-side and sensor-side surfaces of the sixth and

seventh lenses

116 and 117 may include the description of the first embodiment.

As shown in FIG. 15 , the lens surfaces of the sixth and

seventh lenses

116 and 117 among the lenses of the lens unit 100A in the second embodiment may include an aspheric surface with a 30th order aspherical coefficient. As shown in Figure 16, the thickness (T1-T7) of the first to seventh lenses (111-117) and the gap (G1-G6) between two adjacent lenses can be set. The center thickness (CT45) of the bonded lens 145 may be greater than the edge thickness (ET45). The center thickness (CT45) of the bonded lens 145 is the distance from the center of the object-side seventh surface (S7) of the fourth lens 114 to the center of the tenth surface (S10) of the fifth lens 115, The edge thickness ET45 is the distance from the end of the effective area of the seventh surface S7 to the tenth surface S10 in the optical axis direction. The maximum thickness of the bonded lens 145A is at the center, the minimum thickness is at the edge, and the maximum thickness may be 1.1 times or more, for example, 1.1 to 2.5 times the minimum thickness.

As shown in FIG. 17 , the angle (CRA) of the main ray in the optical system and camera module of FIG. 13 may be 10 degrees or more, for example, in the range of 10 degrees to 35 degrees or in the range of 10 degrees to 25 degrees. 20 is a graph showing the peripheral light ratio or peripheral illuminance according to the image height in the optical system according to the embodiment, and is 70% or more, for example, 75%, from the center of the image sensor to the end of the diagonal according to temperature changes between low and high temperatures. It can be seen that the above ambient light ratio appears. FIG. 18 is a graph showing the diffraction MTF at room temperature in the optical system of FIG. 13, and is a graph showing luminance ratio (modulation) according to spatial frequency. In the second embodiment of the invention, the deviation of MTF from low or high temperature based on room temperature may be less than 10%, that is, 7% or less. Figure 19 is a graph showing aberration characteristics at room temperature in the optical system of Figure 13. The aberration graph in Figure 19 is a graph measuring spherical aberration, astigmatic field curves, and distortion from left to right. In FIG. 19, the X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. In addition, the graph for spherical aberration is a graph for light in the wavelength band of approximately 435 nm, approximately 486 nm, approximately 546 nm, approximately 587 nm, and approximately 656 nm, and the graph for astigmatism and distortion aberration is a graph for light in the approximately 546 nm wavelength band. . In the aberration diagram of FIG. 19, it can be interpreted that the closer each curve at room temperature is to the Y-axis, the better the aberration correction function is. In the optical system 1000 according to the embodiment, the measured values are adjacent to the Y-axis in most areas. You can see that 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). Here, the low temperature is -20 degrees or lower, for example, in the range of -20 to -40 degrees, the room temperature is in the range of 22 degrees ± 5 degrees or 18 to 27 degrees, and the high temperature is 85 degrees or higher, for example, in the range of 85 to 105 degrees. It can be. Accordingly, it can be seen that the decrease in luminance ratio (modulation) from the low temperature to the high temperature in FIGS. 10 to 12 is less than 10%, for example, 5% or less, or is almost unchanged. Therefore, the optical system according to the second embodiment has a change in optical characteristics according to a temperature change from low to high temperature, such as a change rate of effective focal length (EFL), TTL, BFL, F number, and diagonal angle of view (FOV) of 10. It can be seen that it is % or less, that is, 5% or less, for example, in the range of 0 to 5%. Even if at least one or two aspherical lenses are used, temperature compensation for the aspherical lenses is designed to prevent deterioration in the reliability of optical characteristics. The optical system of the embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the center but also in the periphery of the field of view (FOV).

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, when 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. Additionally, the optical system 1000 may have improved resolution. In addition, the meaning of the thickness of the lens at the optical axis (OA) and the distance between the adjacent lenses at the optical axis (OA) described in the equations may refer to the embodiment disclosed above.

[Equation 1] 1 < CT1 / CT2 < 5

Equation 1 sets the difference in the center thickness of the first and second lenses, thereby improving the chromatic aberration of the optical system. Equation 1 can satisfy 1 < CT1 / CT2 < 3. By making the thickness of the

first lenses

101 and 111 made of glass thicker than the center thickness of adjacent lenses, changes in optical properties due to temperature changes can be suppressed, and optical performance in the center and periphery of the field of view (FOV) can be improved. .

[Equation 2]

(CT7*CA7) < (CT1*CA1)

Equation 2 can set the central thickness and effective diameter of the first and sixth lenses. The effective diameter is the average of the effective diameters of the object side and sensor side of each lens. In Equation 2, the conditions CT7 < CT1 and CA7 < CA1 can be satisfied. By setting the central thickness and effective diameter of the glass lens and plastic lens, the optical system can improve spherical aberration and provide a slim camera module.

[Equation 3] Po1 < 0

In Equation 3, Po1 represents the refractive power of the first lens 101, and can be set to have a shorter effective focal length (F) compared to TTL in the optical system for the performance of the optical system. Accordingly, TTL > F may be satisfied, and for example, TTL may be in the range of 1.5 times or more, for example, 1.5 to 3 times the effective focal length (F).

[Equation 4] 1.70 < Nd5 < 2.2

Nd5 is the refractive index at the d-line of the fifth lens (105, 115). Equation 4 sets the refractive index of the fifth lens high, so that factors affecting the reduction of third-order aberration (Seidel aberration) of the optical system can be adjusted, and aberrations that may occur as the TTL becomes somewhat longer can be reduced. Equation 4 preferably satisfies 1.75 ≤ Nd5 < 2.0. If designed lower than the lower limit of Equation 4, performance can be achieved by reducing aberration, and the refractive power of the fifth lens may be weakened and light cannot be collected efficiently, which may deteriorate the performance of the optical system. If it is designed to be higher than the upper limit of Equation 4 above, there is a disadvantage in that it becomes difficult to obtain materials. In addition, if the refractive index of the fifth lens (105, 115) is designed to be lower than the lower limit of Equation 4, the radius of curvature of the sixth and seventh lenses must be increased to increase the refractive power of the sixth and seventh lenses, and in this case, the lens manufacturing This becomes more difficult, the lens defect rate increases, and yield may decrease.

[Equation 4-1] 1.60 ≤ Aver(Nd1:Nd7) ≤ 1.70

In Equation 4-1, Aver(Nd1:Nd7) is the average of the refractive index values in the d-line of the first to seventh lenses. When the optical system 1000 according to the embodiment satisfies Equation 4-1, the optical system 1000 can set the resolution and suppress the influence on TTL.

[Equation 4-2] 1.0 < SSL_Nd_Aver/ASL_Nd_Aver < 1.5

SSL_Nd_Aver is the average refractive index of the spherical lenses in the lens unit (100, 100A), and ASL_Nd_Aver is the average refractive index of the aspherical lenses. By placing aspherical lenses with high refractive index on both sides of the glass lenses, color dispersion can be adjusted on both sides of the optical system.

[Equation 4-3] 1.5 ≤ Nd1 < 1.65

Nd1 is the refractive index at the d-line of the

first lenses

101 and 111. Equation 4-3 sets the refractive index of the first lens to be high, thereby lowering color dispersion and increasing the gap between the first and second lenses.

[Equation 5] 20 < FOV_H < 40

In Equation 5, FOV_H represents the horizontal angle of view, and the range of the vehicle optical system can be set. Equation 5 preferably satisfies 25 ≤ FOV_H ≤ 35 or satisfies the range of 30 degrees ± 3 degrees, and in this case, the sensor length in the horizontal direction can be based on 8.064 mm ± 0.5 mm. Additionally, when Equation 5 is satisfied, when the temperature changes from room temperature to high, the rate of change of the effective focal distance and the change rate of the angle of view can be set to 5% or less, for example, 0 to 5%. In addition, even if one or more aspherical lenses are mixed with spherical lenses, for example, two or more aspherical lenses are used in the optical system 1000, degradation of optical characteristics can be prevented through temperature compensation of the glass lens. Here, when the vertical angle of view is FOV_V, the condition of 10 < FOV_V < FOV_H can be satisfied.

[Equation 6] L1R1 < 0

L1R1 is the radius of curvature at the optical axis of the first surface S1 of the first lens 101, and may be set to less than 0. If Equation 6 is satisfied, the shape of the optical system can be limited. The object-side surface of the first lens 101 is concave from the optical axis, so that surface damage can be prevented when it comes into contact with an external structure, and incident light can be refracted in a direction away from the optical axis. Accordingly, the edge thickness can be increased than the center thickness of the first lenses (101, 111), and the gap between the first lenses (101, 111) and the second lenses (102, 112) can be increased.

[Equation 6-1] L3R1 > 0, L2R1 > 0

L3R1 is the radius of curvature at the optical axis of the object-side surface of the third lens 103, and L2R1 is the radius of curvature at the optical axis of the object-side surface of the second lens. Since the second and third lenses have a convex shape on both sides of the optical axis, the distance between the first and second lenses can be increased, and the radius of curvature of the sensor side of the second lenses (102, 112) is increased to increase the distance between the first and third lenses. The center spacing between lenses can be reduced. Since the second to fourth lenses are provided as spherical lenses with a large effective diameter and a large average radius of curvature, assembly efficiency can be improved. As a result, the influence on the optical characteristics of light traveling through the second to fourth lenses can be reduced. Since the condition of L3R2 > L3R1 is satisfied as an absolute value, light can be adjusted so that the effective diameters of the lenses disposed on the sensor side, that is, the fourth to seventh lenses, are not larger than the third lens, and the TTL can be reduced. If the condition is L3R1 > L3R2 in absolute value, there is a problem in which aberration occurs between the object-side surfaces of the first lens and the second lens, the effective diameter of the sensor-side lenses increases, or the TTL increases.

[Equation 7] 0.8 < BFL/L7S2_max_sag to Sensor < 3

BFL is the optical axis distance from the center of the sensor side of the last lens, that is, the seventh lens, to the surface of the image sensor. L7S2_max_sag to Sensor may be the distance in the optical axis direction from the maximum Sag value of the seventh lens 107 to the image sensor 300. If the optical system satisfies Equation 7, TTL can be reduced and conditions for manufacturing a camera module can be set. In addition, L7S2_max_sag to Sensor can set a space where the optical filter 500 and the cover glass 400 located between the image sensor 300 and the

seventh lens

107 and 117 can be placed. If the range of Equation 7 is smaller than the lower limit, the space for placing circuit structures such as optical filters and image sensors becomes limited, making the process of assembling circuit structures such as filters and image sensors into the optical system difficult. If the range of Equation 7 is larger than the upper limit, the process of assembling circuit structures such as filters and image sensors into the optical system is easy, but the TTL becomes longer, making miniaturization of the optical system difficult. That is, Equation 7 can set the minimum distance between the image sensor 300 and the last lens. The BFL is the optical axis distance from the image sensor 300 to the center of the sensor side of the last lens. In detail, if 2 < BFL/L7S2_max_sag to Sensor < 3 is satisfied, it is easier to manufacture and reduce TTL.

[Equation 8] 1 < CT1 / CT7 < 6

If Equation 8 is satisfied, the aberration characteristics can be improved and the influence on the reduction of the optical system can be set. Equation 8 preferably satisfies 2 ≤ CT1 / CT7 < 5. Equation 8 sets the center thickness of the first lens having an aspherical surface and the seventh lens having an aspherical surface, and can limit the difference in center thickness between them. Accordingly, chromatic aberration of the optical system can be improved, good optical performance can be achieved at a set viewing angle, and TTL can be controlled.

[Equation 8-1] 0.1 < CT1/CA11 < 0.5

In Equation 2, the center thickness (CT1) of the first lens (101, 111) and the effective diameter (CA11) of the object side surface (S1) of the first lens (101) can be set. If this is satisfied, the glass material lens can be set. Deterioration of strength and optical properties can be prevented. If it is lower than the range of Equation 1, the lens may be damaged or processing is difficult, and if it is larger than the above range, the TTL may increase and the weight of the optical system may become heavy. Preferably, 0.15 ≤ CT1/CA11 ≤ 0.3 may be satisfied.

[Equation 9] 1 < CG1 / CT1 < 5

CG1 is the center distance between the first and second lenses. In Equation 9, the center spacing between the first and second lenses and the center thickness of the first lens having an aspherical surface can be set. If the optical system satisfies Equation 9, the influence of heat transmitted from the outside of the second to seventh lenses to the first lens can be reduced. Equation 9 may preferably satisfy 1.5 < CG1 / CT1 < 4.

[Equation 10] 1 < CG1/CT45 < 3

In Equation 10, CT45 is the central thickness of the fourth and fifth lenses, for example, the central thickness of the bonded lenses (145 and 145A). That is, CT45 is the optical axis distance from the center of the object-side surface of the fourth lens (104, 114) to the center of the sensor-side surface of the fifth lens (105, 115). If the optical system satisfies Equation 10, the center spacing between the bonded lens and the first and second lenses can be set to improve aberration characteristics, and preferably 1.5 ≤ CG1/CT45 < 2.

[Equation 11] 0 < |L2R1 / L4R2| < 1

In Equation 11, L2R1 refers to the radius of curvature of the first surface (S1) of the second lens (102, 112), and L4R2 refers to the radius of curvature of the eighth surface (S8) of the fourth lens (104, 114). When the optical system 1000 according to the embodiment satisfies Equation 11, the aberration characteristics of the optical system 1000 may be improved.

[Equation 12] 0 < CT45 - ET45 < 2mm

In Equation 12, ET45 is the optical axis distance from the end of the effective area of the object-side surface of the fourth lens (104, 114) to the end of the effective area of the sensor-side surface of the fifth lens (105, 115). If the optical system satisfies Equation 12, the aberration characteristics can be improved by setting the center thickness and edge thickness of the bonded lens, and preferably 1mm ≤ CT45 / ET45 < 1.5mm. The ET45 may be greater than the edge thicknesses (ET1 - ET7) of each of the second to seventh lenses.

[Equation 13] 0 < CA11 / CA31 < 2

In Equation 13, CA11 refers to the effective diameter of the first surface (S1) of the first lens (101, 111), and CA31 refers to the effective diameter of the fifth surface (S5) of the third lens (103, 113). When Equation 13 is satisfied, the optical system 1000 can control incident light and set factors affecting aberration. Preferably, 1 < CA11 / CA31 < 1.5 can be satisfied.

[Equation 14] 0 < CA72 / CA42 < 2

In Equation 14, CA42 refers to the effective diameter of the eighth surface (S8) of the fourth lens (104, 114), and CA72 refers to the effective diameter of the fourteenth surface (S14) of the seventh lens (107, 117). If Equation 14 is satisfied, the optical system 1000 can control the incident light path and set factors for performance change according to CRA and temperature. Preferably, Equation 14 may satisfy 0.5 < CA72 / CA42 < 1.0.

[Equation 15] 0 < CA12 / CA21 < 2

In Equation 15, CA12 refers to the effective diameter of the second surface (S2) of the first lens (101, 111), and CA21 refers to the effective diameter of the third surface (S3) of the second lens (102, 112). When the optical system 1000 according to the embodiment satisfies Equation 15, the optical system 1000 can control light traveling to the first lens group (LG1) and the second lens group (LG2), and lens sensitivity is reduced. You can set factors that affect . Equation 15 may preferably satisfy 1 ≤ CA12 / CA21 < 1.5.

[Equation 16] 1 < CA1 / CA6 < 2

CA1 refers to the effective diameter of the

first lens

101 and 111, and CA6 refers to the effective diameter of the sixth lens 106. If the optical system 1000 according to the embodiment satisfies Equation 16, the size of the spherical lens(s) can be set. Equation 16 may preferably satisfy 1 < CA31 / CA42 < 1.7.

[Equation 17] 1 < CA41 / CA52 < 2

CA42 refers to the effective diameter of the seventh surface (S7) of the fourth lens (104, 114), and CA52 refers to the effective diameter of the tenth surface (S10) of the fifth lens (105, 115). When the optical system 1000 according to the embodiment satisfies Equation 17, the optical system 1000 can improve chromatic aberration and set the size between the object side and the sensor side of the bonded

lenses

145 and 145A. there is. Accordingly, by setting the effective diameter size of the bonded lens disposed closer to the object than the aspherical lens, light incident through the bonded lens can be effectively guided to the aspherical lens. Equation 17 may preferably satisfy 1 < CA41 / CA42 < 1.6.

[Equation 18] 0 < CA52 / CA61 < 2

CA61 refers to the 11th surface (S11) of the sixth lens (106, 116). When the optical system 1000 according to the embodiment satisfies Equation 18, a relationship can be established between the effective diameter of the sensor-side surface of the bonded

lenses

145 and 145A and the effective diameter of the object-side surface of the lens adjacent thereto. Accordingly, the optical system 1000 can improve chromatic aberration and set the size and radius of curvature between the sensor side surfaces of the bonded lens. Accordingly, the effective diameter size of the aspherical lens and the spherical lens placed on the object side than the last lens can be set. Equation 18 may preferably satisfy 0.5 < CA52 / CA61 < 1.

[Equation 18-1] CA41 > (ImgH*2)

[Equation 18-2] CA51 > (ImgH*2)

[Equation 18-3] CA52 < (ImgH*2)

[Equation 18-4] CA62 < (ImgH*2)

In Equations 18-1 to 18-4, the effective diameter of the object-side surface and the sensor-side surface of the fifth lens (105, 115), the effective diameter of the object-side surface of the fourth lens (104, 114), and the sensor-side surface of the sixth lens (106, 116) An optical path can be set to the area of the image sensor 300 by the effective diameter of . In the embodiment, the nth lens is provided as an aspherical lens, so the effective diameter ratio of the adjacent spherical lens and the bonded lens can satisfy Equations 18 to 18-3.

[Equation 19] 0 < SSL_CA_Aver/ASL_CA_Aver < 1

In Equation 19, SSL_CA_Aver represents the average effective diameter of lenses having a spherical surface, and ASL_CA_Aver represents the average effective diameter of lenses having an aspherical surface. In Equation 19, the effective diameter size of the aspherical lens placed on the object side is set to the maximum, so that the path of incident light can be effectively guided. Additionally, the difference in effective diameter between the spherical lens and the aspherical lens can be set to be small. Preferably, 0.5 < SSL_CA_Aver/ASL_CA_Aver < 1 may be satisfied. Here, nGL > nASL > nPL > 0 can be satisfied. nGL is the number of glass lenses, nPL is the number of plastic lenses, and nASL is the number of aspherical lenses.

[Equation 20] 0 < SSL_Nd_Aver/ASL_Nd_Aver < 1.60

In Equation 19, SSL_Nd_Aver is the average refractive index of lenses made of spherical material, for example, the average refractive index of the second to sixth lenses. ASL_Nd_Aver is the average refractive index of the 1st and 7th lenses. Preferably, the refractive index of the spherical lens and the refractive index of the aspherical lens can be set to satisfy the condition of 1 ≤ SSL_nd_Aver/ASL_nd_Aver < 1.2.

[Equation 20-1] 0 < ΣASL_Nd / ΣSSL_Nd < 0.5

ΣASL_Nd is the sum of the refractive indices of the aspherical lens, and ΣSSL_Nd is the sum of the refractive indices of the spherical lens. Preferably, 0.2 < ΣASL_Nd / ΣSSL_Nd < 0.5 may be satisfied. The optical system can control resolution and color dispersion by setting the difference in refractive index between spherical and aspherical lenses.

[Equation 21] CA7 < (ImgH*2) < CG1

In Equation 21, CA7 is the average effective diameter of the object side and sensor side of the plastic lens, and CG1 is the center distance between the first and second lenses. Since the diagonal length of the image sensor satisfies Equation 21 above, a slim camera module can be provided.

[Equation 22] (CT2+CT3+CT4) < CG1

Equation 22 can be set so that the center spacing between the first and second lenses is greater than the sum of the center thicknesses of three adjacent lenses. If Equation 22 is satisfied, the central thickness from the second lens to the fourth lens can be set, and the optical performance of the peripheral part of the field of view (FOV) can be improved.

[Equation 22-1] G4 < 0.01 or CG4 < 0.01

In Equation 22-1, G4 and CG4 are the distance between the fourth lens 104 and the fifth lens 105 and the center distance. If Equation 22-1 is satisfied, the fourth and fifth lenses can be set as bonded lenses.

[Equation 23] 0 < CT7 / CG6 < 1.5

In Equation 23, CG6 is the center distance between the sensor-side surface of the sixth lens 106 and the object-side surface of the seventh lens 107. In Equation 23, by setting the center thickness (CT7) of the seventh lens 107 and the center distance between the sixth and seventh lenses, optical performance can be improved at the periphery of the angle of view. Equation 23 may preferably satisfy 0.5 < CT7/CG6 < 1.5.

[Equation 24] CT3 < (CT2*2) < CG1 < F

The relationship between the maximum center spacing (CG1), the center thickness of the second and third lenses, and the overall effective focal length (F) can be set. According to Equation 24, incident light can be guided by the thickness and maximum center spacing of the glass lenses on the object side, heat compensation according to temperature changes is possible, and assembly characteristics can be improved.

[Equation 25] (CT7*3) < CG1 < F

When the central thickness of the seventh lens satisfies Equation 25, the emitted light can be refracted to the entire area of the image sensor by the thickness of the aspherical lens on the sensor side, and the TTL can be reduced.

[Equation 26] 2 < CT6/CT7 < 6

In Equation 26, by setting the center thickness (CT6) of the sixth lens to be thicker than the center thickness (CT7) of the seventh lens, factors affecting aberration can be controlled. Preferably, Equation 26 may satisfy 3 < CT6/CT7 < 5.

[Equation 27] 10 < L7R1 / CT7 < 40

L7R1 means the radius of curvature of the 13th surface of the 7th lens at the optical axis. In Equation 27, the refractive power of the seventh lens can be controlled by setting the radius of curvature of the object-side surface of the seventh lens and the central thickness of the seventh lens. Accordingly, good optical performance can be achieved in the center and periphery of the angle of view. Preferably, Equation 27 may satisfy 10 < L7R1 / CT7 < 30.

[Equation 28] 0 < L5R2 / L7R1 < 1

L5R2 means the radius of curvature of the 10th surface of the 5th lens at the optical axis. In Equation 28, the radius of curvature of the sensor-side surface of the fifth lens and the radius of curvature of the object-side surface of the seventh lens can be set to control the refractive power of the fifth and seventh lenses. Accordingly, good optical performance can be achieved in the center and periphery of the angle of view. Preferably, Equation 28 may satisfy 0 < L5R2 / L7R1 < 0.5.

[Equation 29] L1R1*L1R2 < 0

L1R2 refers to the radius of curvature of the sensor side surface of the first lens at the optical axis. If Equation 29 is satisfied, the refractive power of the first lens and the dispersion of incident light can be adjusted, and the gap between the first and second lenses and the assembly of the first lens can be improved.

[Equation 30] 0 < L5R1/L4R2 < 2

L5R1 is the radius of curvature of the object-side surface of the fifth lens on the optical axis, and L4R2 is the radius of curvature of the sensor-side surface of the fourth lens on the optical axis. If Equation 30 is satisfied, the fourth and fifth lenses can be expressed as a bonded lens. Preferably, L5R1/L4R2 = 1 may be satisfied.

[Equation 31] 0 < L6R2/L6R1 < 3

L6R1 means the radius of curvature of the object-side surface of the sixth lens on the optical axis, and L6R2 means the radius of curvature of the sensor-side surface of the sixth lens on the optical axis. In Equation 31, the radius of curvature of the object side and the sensor side of the sixth lens can be set. Equation 31 may preferably satisfy 1.5 < L6R2 /L6R1 < 3. The object-side surface and the sensor-side surface of the sixth lens, which is a glass lens, are spherical, and when the difference in radius of curvature between the object-side surface and the sensor-side surface satisfies the above range, the assembling of the sixth lens can be improved, and the temperature change The influence on optical properties can be suppressed.

[Equation 31-1] 1 < L7R1 / L7R2 < 3

L7R1 and L7R2 refer to the radius of curvature of the object side surface and the sensor side surface of the seventh lens on the optical axis. In Equation 31-1, by setting the radius of curvature of the aspherical object side surface and the aspherical sensor side surface of the plastic lens, light can be refracted to the entire area of the image sensor through the seventh lens. Accordingly, when the difference in radius of curvature between the object-side surface and the sensor-side surface of the seventh lens satisfies the above range, the assemblage of the seventh lens can be improved, and the influence of temperature changes on optical characteristics can be suppressed. .

[Equation 32] 0 < CG_Max / CT_Max < 3

In Equation 32, the maximum center thickness (CT_Max) among the lenses and the maximum center spacing (CG_Max) between adjacent lenses can be set. If Equation 32 is satisfied, the optical system can have good optical performance at the focal distance at the set angle of view and can reduce TTL. Preferably, the first embodiment can satisfy 1 < CG_Max / CT_Max < 2.

[Equation 33] 1 < ΣCT / ΣCG < 5

ΣCT is the sum of the central thicknesses of the lenses, and ΣCG is the sum of the central spacings between adjacent lenses. If Equation 33 is satisfied, the optical system can have good optical performance at the focal length at the set angle of view and can reduce TTL. Preferably, 1 < ΣCT / ΣCG < 2 may be satisfied.

[Equation 34] 8 < ΣNd < 30

ΣNd means the sum of the refractive indices at the d-line of each of the plurality of lenses. If Equation 34 is satisfied, TTL can be controlled in the optical system 1000 where an aspherical lens and a spherical lens are mixed, and improved resolution can be achieved. Additionally, when the number of spherical lenses is greater than the number of aspherical lenses, heat compensation is possible using a relatively thick spherical lens, and the sum of the TTL and refractive index of the lenses can be set. Equation 34 may preferably satisfy 10 < ΣNd < 13.

[Equation 35] 10 < ΣVd / ΣNd < 50

ΣVd means the sum of the Abbe numbers of each of the plurality of lenses. When Equation 35 is satisfied, the optical system 1000 can have improved aberration characteristics and resolution. By setting Equation 35 to the sum of the Abbe numbers and refractive indices of the lenses, optical characteristics can be controlled, and preferably 20 < ΣVd / ΣNd < 35.

[Equation 36] Distortion < 2

Distortion refers to the maximum value or absolute value of the maximum distortion from the center (0.0F) of the image sensor to the diagonal end (1.0F) based on the optical characteristics detected by the image sensor 300. When the optical system 1000 satisfies Equation 36, the optical system 1000 can improve distortion characteristics and set conditions for image processing. Preferably, Distortion < 1 can be satisfied.

[Equation 37] 0 < ΣCT / ΣET < 2

ΣCT is the sum of the center thicknesses of the lenses, and ΣET is the end of the effective area of the lenses, that is, the sum of the edge thicknesses. If Equation 37 is satisfied, the optical system can have good optical performance at the focal distance at the set angle of view and can reduce TTL. Equation 37 may preferably satisfy 1 < ΣCT / ΣET < 1.5.

[Equation 38] 1 < CA11 / CA_Min < 5

CA11 is the effective diameter of the object-side surface of the first lens, and CA_Min represents the minimum effective diameter among the object-side surfaces and sensor-side surfaces of the lenses. If Equation 38 is satisfied, the relationship between the maximum effective diameter of the glass lens and the minimum effective diameter of the plastic lens can be set, controlling incident light, maintaining optical performance, and providing a slimmer module. Equation 38 may preferably satisfy 1 < CA11 / CA_Min < 2.5.

[Equation 39] 1 < CA_Max / CA_Min < 5

CA_Max represents the maximum effective diameter among the object-side and sensor-side surfaces of the lenses. If Equation 39 is satisfied, the optical system can maintain optical performance and set the size for a slim and compact structure. Equation 39 may preferably satisfy 1.2 < CA_Max / CA_Min < 2.5.

[Equation 40] 1 < CA_Max / CA_Aver < 3

CA_Aver represents the average of the effective diameters of the object-side surfaces and sensor-side surfaces of the lenses. If Equation 40 is satisfied, the optical system can maintain optical performance and set a size for a slim and compact structure. Equation 40 may preferably satisfy 1 < CA_Max / CA_Aver < 1.7.

[Equation 41] 0.5 < CA_Min / CA_Aver < 2

If Equation 41 is satisfied, the optical system can maintain optical performance and set the size for a slim and compact structure. Equation 41 may preferably satisfy 0.5 < CA_Min / CA_Aver < 1.

[Equation 42] 1 < CA_Max / (2*ImgH) < 3

Equation 42 can be set to the maximum effective diameter of the lens surfaces (CA_Max) and the diagonal length of the image sensor. If this is satisfied, the optical system can maintain good optical performance and set the size for a slim and compact structure. Equation 42 may preferably satisfy 1 < CA_Max / (2*ImgH) < 2.

[Equation 43] 1 < TD / CA_Max < 4

TD is the optical axis distance from the center of the object side of the first lens to the center of the sensor side of the last lens. If Equation 43 is satisfied, the total optical axis distance and maximum effective diameter of the lenses can be set, and the size for good optical performance can be set. Equation 43 may preferably satisfy 2 < TD / CA_Max < 3.

[Equation 43-1] TD > SD

The SD is the distance from the position of the aperture to the center of the sensor side of the last lens.

[Equation 44] 1 < F / CA61 < 10

F represents the effective focal length (EFL) of the optical system, and may be 10 mm or more, for example, in the range of 10 mm to 20 mm. By setting the relationship between the effective focal length and the effective diameter of the object side of the last spherical lens in Equation 44, the influence on optical system reduction, such as TTL, can be adjusted. Equation 44 may preferably satisfy 1 < F / CA61 < 2.

[Equation 45] 0 < F / |L1R1| < 1

In Equation 45, by setting the effective focal length of the optical system and the radius of curvature at the optical axis of the object-side surface of the first lens, the influence on incident light and TTL can be adjusted. Equation 45 preferably states that 0 < F / |L1R1| < 0.5 can be satisfied.

[Equation 46] Max(CT/ET) < 3

Max(CT/ET) represents the maximum ratio of the center thickness and edge thickness of each lens. If Equation 46 is satisfied, the optical system can control the effect on the effective focal length. Equation 46 may preferably satisfy 0.5 < Max(CT/ET) < 2.5. Accordingly, the assembly of all lenses can be improved.

[Equation 47] 0 < EPD / |L1R1| < 1

EPD refers to the size (mm) of the entrance pupil of the optical system 1000, and L1R1 refers to the radius of curvature of the first surface (S1) of the first lens at the optical axis. When the optical system 1000 according to the embodiment satisfies Equation 47, the optical system 1000 can control incident light. Equation 47 preferably states that 0 < EPD / |L1R1| < 0.5 can be satisfied.

[Equation 48] -10 < F1 / F3 < 0

F1 is the focal length of the first lens, and F3 is the focal length of the third lens. If Equation 48 is satisfied, resolution can be improved by controlling the refractive power of the first and third lenses, and TTL and effective focal length (EFL) can be affected. Preferably, -5 < F1 / F3 < 0 may be satisfied.

[Equation 49] Po4 * Po5 < 0

Po4 is the refractive power value of the fourth lens, and Po5 is the refractive power value of the fifth lens. That is, the refractive powers of the fourth and fifth lenses are opposite to each other, so aberrations can be improved and light can be effectively guided to the aspherical lens. If the Po4 * Po5 value is greater than 0, the effect of improving chromatic aberration as a bonded lens is not significant.

[Equation 49-1] Po1(Po4 * Po5) > 0

[Equation 49-2] F45 < 0

[Equation 49-3] F4*F5 < 0

Po1 is the refractive power value of the first lens, F45 is the composite focal length of the fourth and fifth lenses, F4 is the focal length of the fourth lens, and F5 is the focal length of the fifth lens. When Equations 49-1 to 49-3 are satisfied, it is easy to improve the aberration of the optical system with the fourth lens and the fifth lens, which are bonded lenses, and the incident light can be effectively guided to the aspherical lens.

[Equation 50] 15 < Vd4-Vd5 < 50

Vd4 is the Abbe number of the fourth lens, and Vd5 is the Abbe number of the fifth lens. If Equation 50 is satisfied, the difference in Abbe number between at least two lenses forming a bonded lens can be maintained above a certain value, and chromatic aberration can be improved. Equation 50 may preferably satisfy 20 < Vd4-Vd5 < 40. If the bonded lens is less than the lower limit of Equation 50, there may be little improvement in the aberration characteristics of the optical system.

[Equation 51] 0 < |F1 / F| < 20

Equation 51 sets the relationship between the focal length (F1) of the first lens having an aspherical surface and the effective focal length (F), so that the TTL of the optical system can be set. Equation 51 preferably states that 1 < |F1 / F| < 5 can be satisfied.

[Equation 52] 0 < | F5/F6 | < 1

By setting the relationship between the focal lengths (F5, F6) of the fifth and sixth lenses in Equation 52, the refractive power and optical path of the spherical lens and the adjacent spherical lens can be adjusted and resolution can be improved. Equation 52 preferably has 0 < | F5/F6 | < 0.5 can be satisfied.

[Equation 53] 0 < | F5/F7 | < 1

By setting the relationship between the focal lengths (F5, F7) of the fifth and seventh lenses in Equation 53, the refractive power and optical path of the spherical lens and the last aspherical lens can be adjusted and resolution can be improved. Equation 53 preferably has 0 < | F5/F7 | < 0.2 can be satisfied.

[Equation 54] 0 < | F6/F1 | < 2

By setting the relationship between the focal lengths (F1, F6) of the first and sixth lenses in Equation 54, the refractive power and optical path of the first aspherical lens and the last spherical lens can be adjusted, and the influence of TTL is adjusted to improve resolution. I can do it for you. Equation 54 preferably has 0 < | F6/F1 | < 1 can be satisfied.

[Equation 55] 0 < | F37| / F12 < 3

In Equation 55, the relationship between the composite focal length (F37) of the third to seventh lenses and the composite focal length (F12) of the first and second lenses is set to determine the refractive power of the object-side lens group and the sensor-side lens group of the aperture. Resolution can be improved through control, and the optical system can be provided in a slim and compact size. Equation 55 may preferably satisfy 0 < F37/F12 < 1.5. Here, F12 may be the focal length of the first lens group, F37 may be the focal length of the second lens group, and F37 may have positive refractive power.

[Equation 56] 0 < F37 / F6 < 1

In Equation 56, the relationship between the composite focal length (F37) of the third to seventh lenses and the focal length (F6) of the sixth lens is set, and the composite refractive power of the third to seventh lenses and the refractive power of the last spherical lens are adjusted. This can improve resolution and provide an optical system in a slim and compact size. Equation 56 may preferably satisfy 0.5 < F37 / F6 < 1.

[Equation 57] 0 < | F37/F7 | < 1

In Equation 57, the relationship between the composite focal length (F37) of the third to seventh lenses and the focal length (F7) of the seventh lens is set, and the composite refractive power of the third to seventh lenses and the refractive power of the plastic lens are adjusted. It can improve resolution and provide an optical system in a slim and compact size. Equation 57 preferably states that 0 < | F37/F7 | < 0.7 can be satisfied.

[Equation 58] 0 < F6 / F < 5

By setting the relationship between the focal length (F6) of the sixth lens and the effective focal length (F) in Equation 58, the refractive power of the last spherical lens and the total focal length can be adjusted to improve resolution, slim the optical system, and It can be provided in a compact size. Equation 58 preferably satisfies 1 < F6 / F < 3.5.

[Equation 59] F37 < TTL

In Equation 59, the relationship between the focal length (F37) and total length (TTL) of the second lens group can be set. TTL can be reduced by the second lens group having an aspherical surface.

[Equation 60] 1 < nGL /nASL < 4

nGL represents the number of glass lenses, and nASL represents the number of aspherical lenses. By arranging the aspherical lens in the above range in Equation 60, the thickness of the optical system can be reduced and more diverse refractive powers can be provided through the aspherical surface.

[Equation 61] 5 < nGL / nPL < 7

nPL is the number of plastic lenses in the lens unit. By arranging the number of glass lenses and the number of plastic lenses in the above ratio in Equation 61, the thickness of the optical system can be reduced and more diverse refractive power can be provided through the aspherical surface.

[Equation 62] CA3 < CA2 < CA1

By setting the relationship between the effective diameters (CA1, CA2, CA3) of the first, second, and third lenses, the optical paths of the lenses before and after the aperture can be controlled to set the optical paths of all lenses.

[Equation 63] 0 < ΣPL_CT / ΣGL_CT < 0.5

ΣPL_CT is the sum of the center thicknesses of the plastic lenses, and ΣGL_CT is the sum of the center thicknesses of the glass lenses. If Equation 62 is satisfied, the entire TTL can be controlled by setting the relationship between the thickness of the plastic lens and the thickness of the glass lens compared to TTL. Equation 62 may preferably satisfy 0 < ΣPL_CT / ΣGL_CT < 0.1.

[Equation 64] 10mm < TTL < 50mm

TTL refers to the distance (mm) on the optical axis (OA) from the center of the first surface (S1) of the first lens 101 to the surface of the image sensor 300. By setting the TTL to exceed 10 or 20 in Equation 64, an optical system for a vehicle can be provided. Equation 64 may preferably satisfy the condition of 30 < TTL < 45 or TD < TTL.

[Equation 65] 2mm < ImgH

Equation 65 can set the diagonal size (2*ImgH) of the image sensor 300 and provide an optical system having a sensor size for a vehicle. Equation 65 may preferably satisfy 4mm ≤ ImgH.

[Equation 66] 2mm < BFL < 7mm

In Equation 66, the back focal length (BFL) is set to more than 2 mm and less than 7 mm, so that installation space for the optical filter 500 and cover glass 400 can be secured, and the space between the image sensor 300 and the last lens can be secured. Spacing can improve the assembly of components and improve joint reliability. Equation 66 may preferably satisfy 2.5≤BFL≤3. If the BFL is less than the range of Equation 68, some of the light traveling to the image sensor may not be transmitted to the image sensor, which may cause resolution deterioration. If the BFL exceeds the range of Equation 68, stray light may enter and the aberration characteristics of the optical system may deteriorate.

[Equation 67] 3 < CG1/BFL < 5

In Equation 67, the back focal length (BFL) is set to be smaller than the maximum distance between the lenses, the installation space for the optical filter 500 and the cover glass 400 can be secured, and the distance between the image sensor 300 and the last lens can be reduced. Through this, the assembly of components can be improved and the connection reliability can be improved. Preferably, 3.2 < CG1/BFL < 4.5 can be satisfied in Equation 67.

[Equation 68] CG6 < BFL

In Equation 68, the back focal length (BFL) is set larger than the center distance (CG6) between the spherical lens and the aspherical lens, so that installation space for the optical filter 500 and the cover glass 400 can be secured, and the image sensor ( 300) and the last lens, the assembly of components can be improved and joint reliability can be improved. In addition, the last lens, the seventh lens, can disperse the incident light into the effective area of the image sensor, but if the BFL does not satisfy Equation 68, some of the ejected light may not be transmitted to the effective area of the image sensor. and, as a result, the resolution may be lowered.

[Equation 69] 3 < F < 40

Equation 69 can set the overall effective focal length (F) to suit the vehicle optical system. Equation 69 can satisfy 10 < F < 30.

[Equation 70] FOV < 45

In Equation 70, FOV (Field of view) refers to the diagonal angle of view of the optical system 1000, and can provide a vehicle optical system with an angle of less than 45 degrees. The FOV may preferably satisfy 20 ≤ FOV ≤ 40.

[Equation 71] 1 < TTL / CA_Max < 5

CA_Max refers to the largest effective diameter (mm) among the object side and sensor side of the plurality of lenses, and TTL refers to the distance from the vertex of the first surface (S1) of the first lens to the upper surface of the image sensor 300. It means the distance (mm) from the optical axis (OA). Equation 71 sets the relationship between the total optical axis length and the maximum effective diameter of the optical system, thereby providing an improved optical system for vehicles. Equation 71 may preferably satisfy 1.5 < TTL / CA_Max < 4.

[Equation 72] 2 < TTL / ImgH < 15

Equation 72 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 72, the optical system 1000 can have a TTL for application to the automotive image sensor 300, thereby providing improved image quality. Equation 72 may preferably satisfy 4 < TTL / ImgH ≤ 10.

[Equation 73] 0.1 < BFL / ImgH < 2

Equation 73 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 73, the optical system 1000 can secure a back focal length (BFL) to apply the size of the vehicle image sensor 300, and the last lens and image The spacing between sensors 300 can be set and good optical characteristics can be achieved in the center and periphery of the field of view (FOV). Equation 73 may preferably satisfy 0.3 < BFL / ImgH < 1.

[Equation 74] 5 < TTL / BFL < 20

Equation 74 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 55, the optical system 1000 can secure BFL. Equation 74 preferably satisfies 10 < TTL / BFL < 20.

[Equation 75] 1 < TTL/F < 3

Equation 75 can set the total focal length (F) and total optical axis length (TTL) of the optical system 1000. Accordingly, an optical system for a driver assistance system can be provided. Equation 75 may preferably satisfy 1.5 ≤ TTL / F ≤ 2.8. When the optical system 1000 according to the embodiment satisfies Equation 75, the optical system 1000 can have an appropriate focal distance in the set TTL range, maintains the appropriate focal distance even when the temperature changes from low to high, and does not form an image. Provides an optical system that can be used. If it is less than the lower limit of Equation 75, it is necessary to increase the refractive power of the lenses, making correction of spherical aberration or distortion aberration difficult, and if it is more than the upper limit of Equation 75, the effective diameter or TTL of the lenses becomes longer, making it difficult to capture images. A problem may arise where the lens system becomes larger.

[Equation 76] 1 < F / BFL < 10

Equation 76 can set the overall effective 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 76, the optical system 1000 can have a set angle of view and an appropriate focal distance, and can provide an optical system for a vehicle. 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). Equation 76 may preferably satisfy 3 < F / BFL < 8.

[Equation 77] 1 < F / ImgH < 5

Equation 77 can set the total effective focal length (F) of the optical system 1000 and the diagonal length (ImgH) at the optical axis of the image sensor 300. This optical system 1000 may have improved aberration characteristics in the size of the vehicle image sensor 300. Equation 77 may preferably satisfy 2 < F / ImgH < 4.1.

[Equation 78] 1 < F / EPD < 5

Equation 78 can set the total effective focal length (F) and entrance pupil size of the optical system 1000. Accordingly, the overall brightness of the optical system can be controlled. Equation 78 can preferably set 1 < F / EPD < 3.

[Equation 79] 0 < BFL/TD < 0.3

Equation 79 can establish the relationship between the optical axis distance (TD) and the back focal length (BFL) of the lenses of the optical system 1000. Accordingly, the overall size can be controlled while maintaining the resolution of the optical system. Equation 79 may preferably satisfy 0 < BFL/TD < 0.2. If the condition value of BFL/TD is more than 0.2, BFL is designed to be large compared to TD, so the size of the entire optical system becomes large, making it difficult to miniaturize the optical system, and the distance between the seventh lens and the image sensor becomes longer. , As a result, the amount of unnecessary light may increase through between the seventh lens and the image sensor, and there is a problem of lowering resolution, such as lowering aberration characteristics.

[Equation 80] 0 < EPD/ImgH/FOV < 0.2

Equation 80 can establish the relationship between the entrance pupil size (EPD), the length of half the diagonal length of the image sensor (ImgH), and the diagonal angle of view. Accordingly, the overall size and brightness of the optical system can be controlled. Equation 80 may preferably satisfy 0 < EPD/ImgH/FOV < 0.1.

[Equation 81] 5 < FOV / F# < 40

Equation 81 can establish the relationship between the angle of view in the diagonal direction of the optical system and the F number. Equation 81 preferably satisfies 10 < FOV / F # < 30. Here, F# can be set to 1.8 or less to provide a bright image.

[Equation 82] 1 < ΣGL_CT / F# < 20

Equation 82 can establish the relationship between the sum of the central thicknesses of the glass lenses of the optical system (ΣGL_CT) and the F number (F#). Preferably, 10 < ΣSSL_CT / F# < 20 can be satisfied in Equation 82.

[Equation 83] 0 < ΣPL_CT / F# < 2

Equation 83 can establish the relationship between the sum of the central thicknesses of the plastic lenses of the optical system (ΣPL_CT) and the F number (F#). Equation 83 may preferably satisfy 0.5 < ΣPL_CT / F# < 1.

[Equation 84] 1 < ΣGL_Nd / F# < 10

Equation 84 can establish the relationship between the sum of refractive indices (ΣGL_Nd) and the F number (F#) of the glass lenses of the optical system. Equation 84 may preferably satisfy 3 < ΣGL_Nd / F# < 8.

[Equation 85] 1 < ΣPL_Nd / F# < 2

Equation 84 can establish the relationship between the refractive index sum (ΣPL_Nd) and F number (F#) of the plastic lens. Equation 84 may preferably satisfy 1 < ΣPL_Nd / F# < 1.5.

[Equation 86] |Max_Sag62| < |Max_Sag52|

Max_Sag62 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the sensor side of the sixth lens to the sensor side of the sixth lens, and Max_Sag52 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the sensor side of the fifth lens. This is the maximum distance in the optical axis direction to the sensor side of the fifth lens. If Equation 86 is satisfied, light can be guided to the last spherical lenses and the effective diameters of the fifth and sixth lenses can be adjusted by the radius of curvature of the sensor side of the fifth lens.

[Equation 87] |Max_Sag72| < |Max_Sag62|

Max_Sag72 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis from the sensor side of the seventh lens to the sensor side of the seventh lens. If Equation 87 is satisfied, light can be guided from the spherical lens to the aspherical lens by the radius of curvature of the sensor side of the sixth lens, and the effective diameters of the sixth and seventh lenses can be adjusted.

[Equation 87-1] |Max_Sag52| < |Max_Sag41|

Max_Sag41 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis from the object-side surface of the fourth lens to the object-side surface of the fourth lens. Max_Sag52 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis from the sensor side of the fifth lens to the sensor side of the fifth lens.

The optical system 1000 according to the first and second embodiments may satisfy at least one or two of Equations 1 to 44. At least one or two or more of Equations 1 to 44 may satisfy at least one or two or more of Equations 45 to 87. In this case, the optical system 1000 may have improved optical characteristics. In detail, when the optical system 1000 satisfies at least one of Equations 1 to 44 and/or at least one of Equations 45 to 87, the optical system 1000 has improved resolution and can improve aberration and distortion characteristics. You can. In addition, the optical system 1000 can secure a back focal length (BFL) for applying the automotive image sensor 300, compensate for the decrease in optical characteristics due to temperature changes, and the last lens and image sensor 300. ) can be minimized, allowing for good optical performance in the center and periphery of the field of view (FOV).

Table 2 shows the items of the above-described equations in the optical system 1000 of the first and second embodiments, including TTL (mm), BFL, effective focal length (F) (mm), and ImgH (mm) of the optical system 1000. ), effective diameter (CA) (mm), thickness (mm), TTL (mm), TD (mm), which is the optical axis distance from the first surface (S1) to the fourteenth surface (S14), the first to seventh lenses Each focal length (F1-F7) (mm), sum of refractive index of each lens, sum of Abbe number of each lens, sum of center thickness of each lens (mm), sum of center spacing between adjacent lenses, effective diameter, diagonal angle of view (FOV) (Degree), edge thickness (ET), focal length of the first and second lens groups, F number, etc.

항목item	제1실시예First embodiment	제2실시예Second embodiment
FF	15.21215.212	15.16215.162
F1F1	-56.443-56.443	-52.407-52.407
F2F2	33.59033.590	34.58634.586
F3F3	26.88726.887	27.75627.756
F4F4	17.63817.638	19.04819.048
F5F5	-8.143-8.143	-9.422-9.422
F6F6	35.16635.166	34.31034.310
F7F7	-95.446-95.446	-52.688-52.688
F_LG1F_LG1	55.54755.547	60.07060.070
F_LG2F_LG2	32.23232.232	31.40331.403
F27F27	12.79212.792	12.81212.812
F45F45	-24.785-24.785	-29.853-29.853
ET1ET1	6.6786.678	4.0694.069
ET2ET2	1.3041.304	1.4011.401
ET3ET3	1.3041.304	1.2041.204
ET4ET4	1.2151.215	1.2701.270
ET5ET5	4.5954.595	4.3424.342
ET6ET6	4.0984.098	5.3605.360
ET7ET7	1.4471.447	1.5611.561
F-numberF-number	1.6041.604	1.6041.604
ΣNdΣNd	11.60911.609	11.60911.609
ΣVdΣVd	370.999370.999	370.999370.999
ΣCTΣCT	22.33422.334	20.77520.775
ΣCGΣCG	14.06614.066	15.62515.625
FOVFOV	34.34334.343	34.35834.358
EPDE.P.D.	9.4859.485	9.4549.454
BFLBFL	2.6002.600	2.6002.600
TDTD	36.40036.400	36.40036.400
ImgHImgH	4.6264.626	4.6264.626
SDSD	18.36718.367	19.81419.814
TTLTTL	39.00039.000	39.00039.000
이미지 센서image sensor	3840216038402160

Table 3 shows the result values for Equations 1 to 44 described above in the optical system 1000 of the embodiment. Referring to Table 3, it can be seen that the optical system 1000 satisfies at least one, two, or three of Equations 1 to 44. In detail, it can be seen that the optical system 1000 according to the embodiment satisfies all of Equations 1 to 44 above. Accordingly, the optical system 1000 can have good optical performance in the center and periphery of the field of view (FOV) and can have excellent optical characteristics.

수학식math equation		제1실시예Embodiment 1	제2실시예Second embodiment
1One	1 < CT1 / CT2 < 51 < CT1 / CT2 < 5	2.5772.577	1.3031.303
22	(CT7CA7) < (CT1CA1) (CT7CA7) < (CT1CA1)	만족Satisfaction	만족Satisfaction
33	Po1 < 0Po1 < 0	-0.018-0.018	-0.019-0.019
44	1.7 < Nd5 < 2.21.7 < Nd5 < 2.2	1.8661.866	1.8661.866
55	20 < FOV_H < 4020 < FOV_H < 40	30.0030.00	30.0030.00
66	L1R1 < 0L1R1 < 0	-115.192-115.192	-58.512-58.512
77	0.8 < BFL / Max_Sag72 to Sensor < 30.8 < BFL / Max_Sag72 to Sensor < 3	2.5372.537	2.4622.462
88	1 < CT1 / CT7 < 61 < CT1 / CT7 < 6	4.1654.165	2.3082.308
99	0 < CG1 / CT1 < 30 < CG1 / CT1 < 3	1.7611.761	3.6953.695
1010	1 < CG1/CT45 < 31 < CG1/CT45 < 3	1.6381.638	1.8751.875
1111	0 < \|L2R1 / L4R2\| < 10 < \|L2R1 / L4R2\| < 1	0.1540.154	0.1610.161
1212	0 < (CT45 - ET45) < 20 < (CT45 - ET45) < 2	1.0511.051	1.0531.053
1313	0 < CA11 / CA31 < 20 < CA11 / CA31 < 2	1.3671.367	1.2991.299
1414	0 < CA72 / CA42 < 20 < CA72 / CA42 < 2	0.8480.848	0.8170.817
1515	0 < CA12 / CA21 < 20 < CA12 / CA21 < 2	1.1961.196	1.2061.206
1616	1 < CA1 / CA6 < 21 < CA1 / CA6 < 2	1.7961.796	1.7371.737
1717	1 < CA41 / CA52 < 21 < CA41 / CA52 < 2	1.3771.377	1.3281.328
1818	0 < CA52 / CA61 < 20 < CA52 / CA61 < 2	0.9300.930	0.9480.948
1919	1 < SSL_CA_Aver/ASL_CA_Aver < 1.51 < SSL_CA_Aver/ASL_CA_Aver < 1.5	0.8790.879	0.9050.905
2020	0 < SSL_Nd_Aver/ASL_Nd_Aver < 1.600 < SSL_Nd_Aver/ASL_Nd_Aver < 1.60	1.0231.023	1.0231.023
2121	CA7 < (ImgH2) < CG1 CA7 < (ImgH2) < CG1	만족Satisfaction	만족Satisfaction
2222	(CT2+CT3+CT4) < CG1(CT2+CT3+CT4) < CG1	만족Satisfaction	만족Satisfaction
2323	0 < CT7 / CG6 < 10 < CT7 / CG6 < 1	0.9400.940	1.0071.007
2424	CT3 < (CT22) < CG1 < FCT3 < (CT22) < CG1 < F	만족Satisfaction	만족Satisfaction
2525	(CT73) < CG1 < F(CT73) < CG1 < F	만족Satisfaction	만족Satisfaction
2626	2 < CT6/CT7 < 62 < CT6/CT7 < 6	3.3543.354	4.5474.547
2727	10 < L7R1/CT7 < 4010 < L7R1/CT7 < 40	25.52125.521	19.47819.478
2828	0 < L5R2 / L7R1 < 10 < L5R2 / L7R1 < 1	0.1920.192	0.3040.304
2929	L1R1L1R2 < 0L1R1L1R2 < 0	-5549.309-5549.309	-3968.283-3968.283
3030	0< L5R1 /L4R2 < 20< L5R1 /L4R2 < 2	1.0001.000	1.0001.000
3131	0 < L6R2/L6R1 < 3 0 < L6R2/L6R1 < 3	1.5531.553	1.8151.815
3232	0 < CG_Max / CT_Max < 30 < CG_Max / CT_Max < 3	1.7611.761	1.8751.875
3333	1 < ΣCT / ΣCG < 51 < ΣCT / ΣCG < 5	1.5881.588	1.3301.330
3434	8 < ΣNd <308 < ΣNd <30	11.60911.609	11.60911.609
3535	10 < ΣVd / ΣNd <5010 < ΣVd / ΣNd <50	31.95731.957	31.95731.957
3636	Distotion < 2Distortion < 2	만족Satisfaction	만족Satisfaction
3737	0 < ΣCT / ΣET < 20 < ΣCT / ΣET < 2	1.0821.082	1.0821.082
3838	1 < CA11 / CA_Min < 51 < CA11 / CA_Min < 5	1.9711.971	1.9051.905
3939	1 < CA_Max / CA_Min < 51 < CA_Max / CA_Min < 5	1.9711.971	1.9051.905
4040	1 < CA_Max / CA_Aver < 31 < CA_Max / CA_Aver < 3	1.4811.481	1.4191.419
4141	0.5 < CA_Min / CA_Aver < 20.5 < CA_Min / CA_Aver < 2	0.7510.751	0.7450.745
4242	1 < CA_Max / (2ImgH) < 31 < CA_Max / (2ImgH) < 3	1.7721.772	1.7371.737
4343	1 < TD / CA_Max < 41 < TD / CA_Max < 4	2.2212.221	2.2652.265
4444	1 < F / CA61 < 101 < F/CA61 < 10	1.6961.696	1.6081.608

Table 4 shows the result values for Equations 45 to 87 described above in the optical system 1000 of the embodiment. Referring to Table 4, it can be seen that the optical system 1000 satisfies at least one, two, or three of Equations 45 to 87. In detail, it can be seen that the optical system 1000 according to the embodiment satisfies all of Equations 1 to 87 above. Accordingly, the optical system 1000 can have good optical performance in the center and periphery of the field of view (FOV) and can have excellent optical characteristics.

수학식math equation		제1실시예Embodiment 1	제2실시예Second embodiment
4545	0 < F / \|L1R1\| < 10 < F / \|L1R1\| < 1	0.1320.132	0.2590.259
4646	Max (CT/ET) < 3Max (CT/ET) < 3	0.8500.850	0.7370.737
4747	0 < EPD/\|L1R1\| < 10 <EPD/\|L1R1\| < 1	0.0820.082	0.1620.162
4848	-10 < F1 / F3 < 0-10 < F1 / F3 < 0	-2.099-2.099	-1.888-1.888
4949	Po4 * Po5 < 0Po4 * Po5 < 0	만족Satisfaction	만족Satisfaction
5050	15 < Vd4-Vd5 < 6015 < Vd4-Vd5 < 60	33.398 33.398	33.398 33.398
5151	0 < \|F1 / F\| < 200 < \|F1 / F\| < 20	3.710 3.710	3.456 3.456
5252	0 < \| F5 /F6 \| < 10 < \| F5 /F6 \| < 1	0.232 0.232	0.275 0.275
5353	0 < \| F5 /F7 \| < 10 < \| F5 /F7 \| < 1	0.085 0.085	0.179 0.179
5454	0 < \| F6 / F1 \| < 20 < \| F6/F1 \| < 2	0.623 0.623	0.655 0.655
5555	0 < \|F37 \| / F12 < 30 < \|F37 \| / F12 < 3	0.580 0.580	0.523 0.523
5656	0 < F37 / F6 < 10 < F37 / F6 < 1	0.917 0.917	0.915 0.915
5757	0< \|F37 / F7\| < 10< \|F37 / F7\| < 1	0.338 0.338	0.596 0.596
5858	0 < F6 / F < 50 < F6 / F < 5	2.312 2.312	2.263 2.263
5959	F37 < TTLF37 <TTL	만족Satisfaction	만족Satisfaction
6060	1 < nGL /nASL< 41 < nGL /nASL < 4	3.0003.000	3.0003.000
6161	5 < nGL / nPL < 75 < nGL / nPL < 7	6.000 6.000	6.000 6.000
6262	CA3 < CA2 < CA1CA3 < CA2 < CA1	만족Satisfaction	만족Satisfaction
6363	0 < ΣPL_CT / ΣGL_CT < 0.50 < ΣPL_CT / ΣGL_CT < 0.5	0.0650.065	0.0670.067
6464	10 < TTL < 5010 < TTL < 50	39.00039.000	39.00039.000
6565	2 < ImgH2 <ImgH	4.6264.626	4.6264.626
6666	2< BFL < 72<BFL<7	2.6002.600	2.6002.600
6767	0.1< CG1/BFL < 10.1< CG1/BFL < 1	3.8463.846	4.2634.263
6868	CG6 < BFLCG6 < BFL	만족Satisfaction	만족Satisfaction
6969	3 < F < 403 < F < 40	15.21215.212	15.16215.162
7070	FOV < 45FOV < 45	34.34334.343	34.35834.358
7171	1 < TTL / CA_max < 51 < TTL / CA_max < 5	2.3792.379	2.4262.426
7272	2 < TTL / ImgH < 152 <TTL/ImgH<15	8.4308.430	8.4308.430
7373	0.1 < BFL / ImgH < 20.1 <BFL/ImgH<2	0.5620.562	0.5620.562
7474	5 < TTL / BFL < 205 <TTL/BFL<20	15.00015.000	15.00015.000
7575	1 < TTL/F < 31 < TTL/F < 3	2.5642.564	2.5722.572
7676	1 < F / BFL < 101 < F/BFL < 10	5.8515.851	5.8325.832
7777	1 < F / ImgH < 51 < F/ImgH < 5	3.2883.288	3.2783.278
7878	1 < F / EPD < 51 < F/EPD < 5	1.6041.604	1.6041.604
7979	0 < BFL/TD < 0.3 0 < BFL/TD < 0.3	0.07140.0714	0.07140.0714
8080	0 < EPD/Imgh/FOV < 0.20 < EPD/Imgh/FOV < 0.2	0.01420.0142	0.01420.0142
8181	5 < FOV / F# < 405 < FOV / F# < 40	21.41321.413	21.42321.423
8282	1 < ΣGL_CT / F# < 201 < ΣGL_CT / F# < 20	13.07513.075	12.14312.143
8383	0 < ΣPL_CT / F# < 20 < ΣPL_CT / F# < 2	0.8500.850	0.8110.811
8484	1 < ΣGL_Nd / F# < 101 < ΣGL_Nd / F# < 10	6.1986.198	6.1986.198
8585	1 < ΣPL_Nd / F# < 21 < ΣPL_Nd / F# < 2	1.0401.040	1.0401.040
8686	\|Max_Sag62\| < \|Max_Sag52\| \|Max_Sag62\| < \|Max_Sag52\|	만족Satisfaction	만족Satisfaction
8787	\|Max_Sag72\| < Max_Sag62 \|Max_Sag72\| < Max_Sag62	만족Satisfaction	만족Satisfaction

The optical system according to the third embodiment of the invention will be described with reference to FIGS. 21 to 35. The description of the third embodiment may include the description and configuration of the first and second embodiments and the same parts as the description of the first and second embodiments.

21 to 26, the optical system 1000 includes a lens unit 100B, and the lens unit 100B may include first to seventh lenses 121 to 127. The first lens group LG1 includes a first lens 121, and the second lens group LG2 includes second to seventh lenses 122-127. An aperture stop may be disposed either around the object-side or sensor-side surface of the first lens 121, or around the object-side or sensor-side surface of the second lens 122.

The first lens 121 may have positive refractive power and may be made of glass. The first surface (S1) of the first lens 121 may be convex, and the second surface (S2) may be concave. The first lens 121 may be provided as an aspherical lens made of glass. The first and second surfaces S1 and S2 may be provided without critical points. The effective radius r11 of the first surface S1 of the first lens 121 may be larger than the effective radius of the plastic lens. The first lens 121 has the largest effective diameter, and since the first surface (S1) is convex and the second surface (S2) is concave, the light incident through the largest effective area is directed toward the optical axis (OA). It can be refracted. In addition, the first lens 121 has a meniscus shape convex toward the object and has a center thickness thinner than the center thickness of the bonded lens 134 and the second and

fifth lenses

122 and 125, so the first and second lenses ( 121,122) can increase the optical axis spacing (CG1) between them. The optical axis gap CG1 between the first and

second lenses

121 and 122 may be greater than the central thickness of the second lens 122 and smaller than the effective diameter of the second lens 122 .

The second lens 122 has negative refractive power and may be made of glass. The third surface S3 of the second lens 122 may be concave, and the fourth surface S4 may be convex. The second lens 122 may be provided as a spherical lens made of glass. The third surface S3 and the fourth surface S4 of the second lens 122 may be spherical.

The third lens 123 has negative refractive power and may be made of glass. The fifth surface S5 of the third lens 123 may be convex, and the sixth surface S6 may be concave. The third lens 123 may be provided as a spherical lens made of glass. The fifth and sixth surfaces S5 and S6 of the third lens 123 may be spherical. The aperture ST may be disposed around the fourth surface S4 on the sensor side of the second lens 122. The composite focal length of the third to seventh lenses 123-127 disposed on the sensor side of the aperture may have a positive value, and may reduce TTL within the angle of view range.

The fourth lens 124 has positive refractive power and may be made of glass. The object-side seventh surface of the fourth lens 124 may be convex, and the sensor-side eighth surface S8 may be convex. The fourth lens 124 may have a convex shape on both sides. Alternatively, at the optical axis OA, the seventh surface may have a concave shape, and the eighth surface S8 may have a concave or convex shape. The fourth lens 124 may have a meniscus shape convex toward the object. The fourth lens 124 may be provided as a spherical lens made of glass. Both the seventh surface and the eighth surface S8 may be spherical.

The third lens 123 and the fourth lens 124 may be bonded. The bonding surface between the third lens 123 and the fourth lens 124 may be defined as the sixth surface S6. The fifth surface S5 may be the same as the seventh surface of the fourth lens 124. The gap G3 between the third and

fifth lenses

123 and 124 may be less than 0.01 mm. The gap G3 between the third and

fifth lenses

123 and 124 may be less than 0.01 mm from the optical axis OA to the end of the effective area. The third and

fifth lenses

123 and 124 have opposite refractive powers, and the combined refractive powers of the third and

fourth lenses

123 and 124 may have positive (+) refractive powers.

The effective diameter of the third lens 123 may be larger than the diagonal length of the image sensor 300. The effective diameter of the third lens 123 is the average of the effective diameters of the seventh surface S7 and the eighth surface S8, and may be larger than the diagonal length of the image sensor 300. The effective diameter of the fourth lens 124 may be larger than the effective diameter of the third lens 123 and smaller than the effective diameter of the fifth lens 125. When the third and

fourth lenses

123 and 124 are glass lenses and the sixth and

seventh lenses

126 and 127 are plastic lenses, each of the fourth and

fifth lenses

124 and 125 is arranged in a shape where both sides are convex. Therefore, it can be refracted so that it does not move away from the passing optical axis.

When the bonded lens 134 is made of glass lenses having different refractive indices and has a spherical refractive surface, the lenses disposed on the sensor side of the bonded lens 134 are aspherical lenses or plastic lenses. Spherical aberration can be compensated. In addition, since the lenses disposed on the sensor side rather than the bonded lens 134 are plastic lenses and have a smaller effective diameter, they can be set to effectively guide light traveling to the image sensor 300 through the plastic lens. Since the position of the bonded lens 134 is located in the middle or in front of the middle within the lens unit 100B, chromatic aberration correction can be more efficient.

The fifth lens 125 has positive refractive power and may be made of glass. The ninth surface S9 of the fifth lens 125 may be convex, and the tenth surface S10 may be convex. The fifth lens 125 may be provided as a spherical lens made of glass. The ninth surface (S9) and the tenth surface (S10) may be spherical. The sixth lens 126 has negative refractive power and may be made of plastic. The 11th surface (S11) of the sixth lens 126 may be convex, and the 12th surface (S12) on the sensor side may be concave. The sixth lens 126 may have a meniscus shape convex toward the object. The sixth lens 126 may be made of plastic and have aspherical surfaces on both sides. The 11th surface S11 and the 12th surface S12 of the sixth lens 126 may be aspherical. The eleventh surface S11 may be provided without a critical point from the optical axis OA to the end of the effective area. The twelfth surface S12 may have at least one critical point from the optical axis OA to the end of the effective area. When the twelfth surface S12 has a critical point, it may be located at more than 70% of the effective radius r62 from the optical axis OA, or may be located in a range from 70% to 90%, or a range from 75% to 85%. . The thirteenth surface S13 may be provided without a critical point.

The seventh lens 127 has negative refractive power and may be made of plastic. The 13th surface S13 of the seventh lens 127 may be convex, and the 14th surface S14 may be concave. The seventh lens 127 is made of plastic and may have aspherical surfaces on both sides. The 13th surface (S13) and the 14th surface (S14) may be aspherical. At least one or both of the 13th surface S13 and the 14th surface S14 may be provided without a critical point from the optical axis OA to the end of the effective radius r72. When the fourteenth surface S14 has a critical point, it may be located at less than 60% of the effective radius r72 at the optical axis OA, or may be located at a range of 10% to 60%, or a range of 10% to 50%. .

By arranging at least two plastic lenses adjacent to the image sensor 300, it can be insensitive to assembly tolerances compared to lenses made of glass. In other words, being insensitive to assembly tolerances means that optical performance may not be significantly affected even if the assembly is assembled with a slight difference compared to the design. In addition, by providing at least two

lenses

126 and 127 adjacent to the image sensor 300 made of plastic, optical performance can be improved by the lens surface having an aspherical surface, and, for example, aberration characteristics can be improved and resolution deterioration can be prevented.

In addition, the sixth and

seventh lenses

126 and 127 have an aspherical surface and a convex shape toward the object, and have negative refractive power, so they can guide the distribution of light irradiated to the entire area of the image sensor 300.

Referring to FIG. 22, a tangent line K3 passing through an arbitrary point of the 14th surface S14 of the seventh lens 127 and a normal line K4 perpendicular to the tangent line K3 are located on the optical axis OA. It may have a parallel axis and a predetermined angle (θ2). The maximum tangent angle θ2 on the fourteenth surface S14 in the first direction

FIG. 23 is an example of lens data of the optical system of the embodiment of FIG. 21. Referring to FIG. 23, when expressed as an absolute value of the radius of curvature, the radius of curvature of the tenth surface S10 of the fifth lens 125 on the optical axis OA is the largest among the lenses, and the radius of curvature of the tenth surface S10 of the fifth lens 125 is the largest among the lenses, and the radius of curvature of the tenth surface S10 of the fifth lens 125 on the optical axis OA is the largest among the lenses. The radius of curvature of the 12 side (S12) may be the smallest among the lenses. The difference between the maximum radius of curvature and the minimum radius of curvature may be 5 times or more, for example in the range of 5 to 15 times. The curvature radii of the sixth lens 126 and the seventh lens 127 made of plastic may be smaller than the radii of curvature of the first to

fifth lenses

121, 122, 123, 124, and 125 made of glass. Here, the radius of curvature is the average of the radii of curvature (absolute value) of the object-side surface and the sensor-side surface of each lens.

When describing the central thickness (CT) of the lenses, the central thickness (CT2) of the second lens 122 may be larger than the central thickness of the plastic lens(s), for example, may be the largest within the lens unit 100B. there is. For example, the center thicknesses (CT2, CT4, CT5) of the second, fourth, and

fifth lenses

122, 124, and 125 may be greater than the center thicknesses (CT6, CT7) of the sixth and seventh lenses. The central thickness of each of the first lens 121 and the third lens 123 may be smaller than the central thickness of each of the sixth and

seventh lenses

126 and 127. The center thickness (CT3) of the third lens 123 is the minimum among the lenses. The difference between the maximum and minimum center thickness may be 2 mm or more. Even if the

lenses

126 and 127 made of plastic have a thin center thickness, optical performance may not deteriorate and the camera module may be provided with a slim thickness. Here, the average of the central thicknesses of the first to seventh lenses 121-127 may be greater than the central thicknesses of the plastic lenses, for example, the sixth and

seventh lenses

126 and 127, respectively. The average effective diameter of the first to seventh lenses 121-127 may be larger than the effective diameters of the plastic lenses, for example, the sixth and

seventh lenses

126 and 127, respectively.

When describing the center spacing between lenses, the first center spacing CG1 between the first lens 121 and the second lens 122 is the maximum. The first center spacing (CG1) is greater than the center thickness (CT1, CT2) of the first and

second lenses

121 and 122, respectively, and may be less than twice the center thickness (CT2) of the second lens 122. At least one of the second center spacing (CG2), the fourth center spacing (CG4), and the fifth center spacing (CG5) is the minimum spacing and may be 0.3 mm or less. Here, the minimum center spacing excludes the bonding surface of the bonding lens 134. The difference between the maximum center spacing and the minimum center spacing may be greater than 3.5 mm, for example in the range of 3.5 mm to 5 mm. In addition, by providing the maximum center spacing between lenses to be 100% or more of the maximum center thickness, for example, in the range of 100% to 200%, the center thickness of the first lens 121 can be provided in a meniscus shape that is thin and convex toward the object. there is.

When explaining the effective diameter, the lens with the maximum effective diameter may be the first lens 121 that is closest to the object. The lens with the minimum effective diameter may be the seventh lens 127. The effective diameter of the glass lenses may be larger than that of the plastic lenses. For example, the effective diameters of the first to fifth lenses 121-125 may be larger than the effective diameters of the sixth and

seventh lenses

126 and 127. The effective diameters of the first to fifth lenses 121 - 125 may be larger than the diagonal length of the image sensor 300 . The sixth lens 126 may have an effective diameter larger than the diagonal length of the image sensor 300, and the seventh lens 127 may have an effective diameter smaller than the diagonal length of the image sensor 300. Accordingly, the plastic lenses can guide the light refracted through the glass lenses to the image sensor 300.

When explaining the refractive index, the refractive index of the first lens 121 is the highest among lenses and may be 1.75 or more or 1.8 or more. The refractive index of the fourth lens 124 is the smallest among the lenses. The difference between the maximum and minimum refractive indices may be 0.23 or more. By setting the refractive index of the lens closest to the object to be the highest and the refractive index of the fourth lens 124 of the bonded lens 134 to be the smallest, incident efficiency is increased and the refractive power between the glass and plastic lenses is adjusted. Thus, it can be guided to the image sensor 300.

Explaining the Abbe number, the Abbe number of the fourth lens 124 is the largest among lenses and may be 65 or more. The Abbe number of the sixth lens 126 is the smallest among the lenses. The difference between the maximum refractive index and the minimum Abbe number may be 45 or more. By providing the largest Abbe number of the fourth lens 124 disposed on the sensor side than the aperture and the smallest Abbe number of the sixth lens 126 disposed between the image sensor 300 and the glass lens, the glass material It is possible to adjust the color dispersion of light traveling between the lenses and guide it to the image sensor 300 by increasing the color dispersion between the lenses made of glass and plastic.

The focal lengths (F2, F3, F6, F7) of the second, fourth, sixth and seventh lenses (122, 123, 126, 127) have negative refractive power, and the focal lengths (F1, F4) of the first, fourth, and fifth lenses (121, 124, 125) ,F5) may have positive refractive power. The fifth lens 125 has positive refractive power, and the sixth and

seventh lenses

126 and 127 made of plastic have negative refractive power, and the refractive index of the fifth lens 125 is that of the sixth lens 126. It is smaller than the refractive index, and the dispersion value of the fifth lens 125 is greater than that of the sixth lens 125. Chromatic aberration occurring in the fifth lens 125 can be corrected with plastic lenses. Additionally, since the focal length of the seventh lens 127 is -300 or less, that is, the power is relatively low and the Abbe number is large, the color correction effect may also be low. In addition, by satisfying the refractive index difference between the continuously arranged fifth and sixth lenses (125, 126) of 0.1 to 0.15 and the Abbe number difference of 20 to 60, the color generated from the glass material disposed on the object side of the plastic lens Aberrations can be compensated for with plastic lenses with negative refractive power.

The optical system 1000 generates chromatic aberration, and the chromatic aberration is corrected using a bonded lens 134 or two lenses arranged in series. As the temperature changes from low to high, the lens repeats contraction and expansion. Since lenses made of the same material have the same amount of change in lens characteristics due to temperature changes, it is effective for plastic lenses made of the same material to correct the chromatic aberration of the fifth lens even if the temperature changes. Therefore, in the third embodiment of the invention, the third lens 123 and the fourth lens 124 mutually correct the chromatic aberration occurring in the glass lens, and the sixth and

seventh lenses

126 and 127 made of plastic. The chromatic aberration occurring in the fifth lens 125 can be corrected using .

The refractive index difference between the third lens 123 and the fourth lens 124, which are bonded lenses, satisfies 0.1 to 0.2, the Abbe number difference satisfies 20 to 60, and the color generated in the fifth lens is made of glass. Aberrations can be compensated for with plastic lenses. The difference in refractive index is rounded to the third decimal place, and the Abbe number difference is rounded to the first decimal place to compare values. Additionally, by disposing glass lenses with relatively high Abbe numbers on the object side of the plastic lenses, chromatic dispersion can be reduced by the glass lenses and chromatic dispersion can be increased by the plastic lenses.

The focal lengths (F1, F4, and F5) of the first, fourth, and fifth lenses (121, 124, and 125) have positive refractive power, and the focal lengths (F2, F3, and F6) of the second, third, and seventh lenses (122, 123, 126, and 127) have positive refractive power. ,F7) may have positive refractive power. Here, the fourth and fifth lenses (124, 125) adjacent to the plastic lenses have positive refractive power, the sixth and seventh lenses (126, 127) have negative refractive power, and the aberrations generated from the glass material and plastic lenses cannot be corrected. You can. Additionally, as the temperature changes from low to high, the amount of change is the same for lenses made of the same material, so even if the temperature changes, aberrations can be corrected by increasing the difference in focal length between lenses made of the same material. Additionally, by disposing glass lenses with relatively high Abbe numbers on the object side of the plastic lenses, chromatic dispersion can be reduced by the glass lenses and chromatic dispersion can be increased by the plastic lenses.

If the focal length is expressed as an absolute value, the focal length of the second lens 122 is the largest among glass lenses and may be 100 or more. The focal length of the seventh lens 127 may be the largest within the lens unit 100B and may be 200 or more. The focal length of the fourth lens 124 is the smallest among the lenses. The difference between the maximum and minimum focus distances may be 100 or more. By providing a large focal length of the two lenses adjacent to the object and the largest focal distance of the plastic lens 127 adjacent to the image sensor 300, improved MTF characteristics, aberration control characteristics, and resolution characteristics in the field of view range set in the optical system etc., and can have good optical performance in the peripheral part of the angle of view.

When expressed as an absolute value, the focal length of glass lenses can be smaller than that of plastic lenses. For example, the composite focal length F15 of the first to fifth lenses 121-125 may be smaller than the composite focal length F67 of the sixth and

seventh lenses

126 and 127. The composite focal length of the first to fifth lenses 121-125 is a positive (+) value, and the composite focal length of the sixth and

seventh lenses

126 and 127 is a negative value.

Looking at the central thickness (CT) of the lenses, for example, at least two of the glass lenses may have a central thickness greater than that of the plastic lenses. If the average of the center thicknesses of the glass lenses in the lens unit 100B is GL _CT _Aver, and the average of the center thicknesses of the plastic materials is PL _CT _Aver, the condition of GL _CT _Aver > PL _CT _Aver can be satisfied. there is. Additionally, the condition 1 < GL _CT _Aver/ PL _CT _Aver < 2 can be satisfied.

The lens closest to the object within the lens unit 100B may have the largest refractive index, which may be greater than 1.7, for example, greater than 1.8. The refractive index of the lens closest to the object may be greater than that of the plastic lens. In the lens unit 100B, the number of glass lenses having a lower refractive index than the average refractive index of plastic lenses may be 2 or less, for example, 1 glass lens. Here, the plastic lens has aspheric surfaces on both the object side and the sensor side, and the refractive index may be less than 1.7.

If the average refractive index of the glass lenses in the lens unit 100B is Aver_GLn and the average refractive index of the plastic lenses is Aver_PLn, the condition PLn_Aver_PLn < Aver_GLn may be satisfied. Additionally, the condition of 1 < Aver_GLn/Aver_PLn <1.2 can be satisfied. Lens(s) with a high refractive index can be placed on the object side of the plastic lens to increase color dispersion.

The average Abbe number of the glass lenses may be greater than the average Abbe number of the plastic lenses. The average Abbe number of the glass lenses may be 50 or more, and the average Abbe number of the plastic lenses may be 45 or less. In the lens unit 100B, the number of glass lenses having an Abbe number lower than the average Abbe number of plastic lenses may be 2 or less, for example, 1 glass lens. Here, the largest Abbe number within the lens unit 100B may be possessed by a glass lens, and the smallest Abbe number may be possessed by a plastic lens. The average Abbe number of the bonded lens 134 may be the largest among the lenses, for example, 70 or more. One of the lenses of the bonded lens 134 may have the largest Abbe number. For example, the object-side lens of the bonded lens 134 may have a larger Abbe number than the Abbe number of the sensor-side lens. When the average Abbe number of the glass lenses is GLv_Aver and the average Abbe number of the plastic lenses is PLv_Aver, the condition PLv_Aver < GLv_Aver can be satisfied. Additionally, the condition of 1 < GLv_Aver/Plv_Aver < 1.8 can be satisfied. Lenses with a low Abbe number can improve color dispersion in locations adjacent to the image sensor 300.

There may be three or more lenses larger than the average effective diameter of the plastic lenses in the lens unit 100B, for example, four or more lenses. If the average effective diameter of the plastic lenses is CA_PL_Aver, and the average effective diameter of the glass lenses is CA_GL_Aver, the condition CA_PL_Aver < CA_GL_Aver can be satisfied. Additionally, the condition of 1 < CA_GL_Aver / CA_PL_Aver < 1.5 can be satisfied. Additionally, the relationship between the length of the image sensor 300 and the average effective diameter (CA_PL_Aver) of the plastic lens may satisfy the condition of 1 ≤ (Imgh*2)/CA_PL_Aver < 1.5. Additionally, the relationship between the average effective age of the glass material and the length of the image sensor 300 may satisfy the condition of 1 ≤ CA_GL_Aver/(Imgh*2) < 1.5. The difference between the maximum length of the image sensor 300 and the effective diameter of the plastic lens may be arranged to be small. Accordingly, by placing a plastic lens with a small effective diameter adjacent to the image sensor 300, the plastic lenses can disperse color from the center of the image sensor 300 to the periphery.

The average effective diameter of the glass materials may be 10.5 mm or more, for example, in the range of 10.5 mm to 15 mm, and may be larger than the average effective diameter of plastic lenses. The minimum effective diameter within the lens unit 100B is in the range of 8 mm to 10 mm, and the maximum effective diameter is the effective diameter of the lens closest to the object and may be in the range of 12 mm to 20 mm. Accordingly, the optical system 1000 can control incident light to improve resolution and chromatic aberration control characteristics, and can improve vignetting characteristics of the optical system 1000.

If the radius of curvature is described as an absolute value, the lens surface having the minimum radius of curvature with respect to the optical axis OA within the lens unit 100B may be placed on the lens surface of the n-1 or n-2 lens. For example, the lens side with the minimum radius of curvature may be the sensor side of the plastic lens closest to the glass lens. The lens face with the maximum radius of curvature may be the lens face of a glass lens. For example, the n-1th sensor side may have the minimum radius of curvature within the lens unit 100B. If the lens surface with the minimum radius of curvature is the sensor side of the plastic lens closest to the glass lens, light can be refracted into the effective area of the last plastic lens with a relatively small effective diameter. Here, the minimum radius of curvature may be 20 or less, for example, 10 or less. The maximum radius of curvature may be three times or more than the minimum radius of curvature.

When expressed as an absolute value, if the average of the radii of curvature of the lenses made of glass is Aver_GLr and the average of the radii of curvature of the lenses made of plastic is Aver_PLr, the condition of Aver_GLr > R_PL_Aver can be satisfied. Additionally, the condition 3 < Aver_PLr/Aver_GLr < 10 can be satisfied. The average of the curvature radii (absolute value) of the glass lens and the plastic lens can satisfy the conditions of 15 < Aver_GLr < 50 and 5 < Aver_PLr < 15. Accordingly, by arranging plastic lenses with a small average radius of curvature adjacent to the image sensor 300, the distribution of light traveling to the image sensor 300 can be adjusted.

As shown in Figure 24, in the embodiment, the lens surfaces (S1, S2, S11, S12, S13, S14) of the first, sixth, and seventh lenses (121, 126, and 127) among the lenses of the lens unit (100B) have a 30th order aspherical coefficient. It may include an aspherical surface. As shown in Figure 25, the thickness (T1-T7) of the first to seventh lenses (121-127) and the gap (G1-G6) between two adjacent lenses can be set. As shown in Figure 5, the thickness of each lens (T1-T7) in the Y-axis direction can be expressed at intervals of 0.1 mm or 0.2 mm or more from the optical axis, and the gap between each lens (G1-G6) is 0.1 mm or 0.2 mm from the optical axis. It can be expressed at intervals of mm or more. The thickness T1 of the first lens 121 may have a difference between the maximum thickness and the minimum thickness of 1.5 times or less, for example, 1 to 1.5 times, and the center thickness may be the maximum and the edge thickness may be the minimum. The thickness T2 of the second lens 122 may have a maximum thickness of 1.5 times or less of the minimum thickness, for example, 1.1 to 1.5 times. The center of the second lens 122 may have the minimum thickness, and the edge may have the maximum thickness. The center thickness (CT2) and the edge thickness (CT2) of the second lens 122 may be greater than the center thickness (CT5) of the fifth lens 125.

The thickness T3 of the third lens 123 may be minimum at the center and maximum at the edge. The central thickness CT3 of the third lens 123 may be the thinnest among the centers of the lenses. The edge thickness ET3 of the third lens 123 may be 1.8 times or less, for example, 1.2 to 1.8 times the center thickness CT3. The center of the fourth lens 124 has the maximum thickness, and the edge has the minimum thickness, and the maximum thickness is 3 times or less, for example, 1.5 to 3 times the minimum thickness. Here, the center thickness (CT34) of the bonded lens 134 may be greater than the edge thickness (ET34).

The center thickness (CT5) of the fifth lens 125 is maximum and may be greater than the edge thickness (ET5). The central thickness CT5 of the fifth lens 125 may be greater than the central thickness CT1 of the first lens 121. The difference between the maximum and minimum thickness of the fifth lens 125 may be 3 times or less, for example, 1.5 to 3 times. The center thickness (CT6) of the sixth lens 126 is minimum, the edge thickness (ET6) is minimum, and the maximum thickness is less than twice the minimum thickness, for example, in the range of 1 to 2 times. The center thickness (CT7) of the seventh lens 127 is minimum and the edge thickness (ET7) is maximum, and the maximum thickness is less than twice the minimum thickness, for example, in the range of 1 to 2 times. As described above, the difference between the center thickness and the edge thickness of each of the first to seventh lenses 121 to 127 can be 3 times or less or 2.5 times or less, preventing light loss or design due to the thickness difference from the optical axis to the edge. can reduce the difficulties.

Among the intervals (G1-G6) between the lenses, the first interval (G1) between the first and second lenses (121, 122) may be maximum at the center and minimum at the edges, and the center interval (CG1) and the edge interval ( The difference between EG1) may be less than 2 times. Among the above intervals (G1 to G6), the interval with the largest difference between the center interval and the edge interval may be the fifth interval (G5).

As shown in FIGS. 22 and 26, Sag61 represents the height from the center of the 11th surface (S11) of the sixth lens 126 to the lens surface in the direction (X, Y) perpendicular to the optical axis (OA), The maximum value of Sag61 may be the height at the edge of the 11th side (S11). Sag62 represents the height from the center of the twelfth surface (S12) of the sixth lens 126 to the lens surface in the direction (X, Y) perpendicular to the optical axis (OA), and the maximum value of Sag62 is the height of the twelfth surface (S12) of the sixth lens 126. It may be the height at the edge of (S12). Sag71 represents the height from the center of the 13th surface (S13) of the seventh lens 127 to the lens surface in the direction (X, Y) perpendicular to the optical axis (OA), and the maximum value of Sag71 is the 13th surface (S13) of the seventh lens 127. It may be the height at the edge of (S13). Sag72 is the height from the center of the 14th surface (S14) of the seventh lens 127 to the lens surface in the direction (X, Y) perpendicular to the optical axis (OA), and the maximum Sag value is the height at the edge. . The maximum Sag values may satisfy the following. The condition Max_Sag62 < Max_Sag61 can be satisfied, and the difference between them can be 0.5 or less. The condition Max_Sag71 < Max_Sag72 < Max_Sag62 can be satisfied, and the difference between Max_Sag71 and Max_Sag72 can be 0.5 or less. By setting the Sag values of the object side and sensor side of these plastic lenses, light between the plastic lenses can be effectively refracted.

As shown in Figures 26 and 35, if the Sag value is positive on the object side and sensor side of the 6th and 7th lenses, the lens side is located on the sensor side based on a straight line perpendicular to the optical axis (OA), If the value is negative, the lens surface is located on the object side based on a straight line perpendicular to the optical axis (OA). The Sag value of the lens surface of the seventh lens 127 can be extended in almost the same graph. Additionally, since the difference in Sag values or graphs between the object-side surface and the sensor-side surface of the sixth and

seventh lenses

126 and 127 is not large, light traveling to the image sensor 300 can be effectively guided. In Figure 35, L6S1 is the 11th surface of the 6th lens 126, L6S2 is the 12th surface of the 6th lens 126, L7S1 is the 13th surface of the 7th lens 127, and L7S2 is the 7th surface. This is the 14th side of the lens 127.

23 and 35, the radius of curvature of the 11th surface S11 of the sixth lens 126 is L6R1, the radius of curvature of the 12th surface S12 is L6R2, and the radius of curvature of the 12th surface S12 is L6R2, and the radius of curvature of the 11th surface S11 of the sixth lens 126 is L6R2. The radius of curvature of the 13th surface S13 is L7R1, and the radius of curvature of the 14th surface S14 is L7R1, and at least one or two of the following conditions may be satisfied.

Condition 1: 5 < L6R1 < 15, Condition 2: 5 < L7R1 < 15, Condition 3: 1 <｜L6R1-L7R1｜ <5, Condition 4: 3 < L6R2 < 14, Condition 5: 3 < L7R2 < 14.5, Condition 5: 6: 1 <｜L7R2-L6R2｜ <5

By setting the difference in curvature radius (mm) between the 11th to 14th surfaces (S11-S14) of the 6th and 7th lenses (126, 127) to a maximum of 5 mm or less, the light traveling through the plastic lenses is transmitted to the image sensor 300. It can be guided to the effective area of . The 11th to 14th surfaces (S11-S14) of the 6th and

7th lenses

126 and 127 may be 15 mm or less. The radius of curvature (mm) of each of the 11th to 14th surfaces (S11-S14) of the sixth and seventh lenses (126, 127) is the radius of curvature (mm) of the first and second surfaces (S1, S2) of the first lens (121). It can be smaller than Additionally, the difference in radius of curvature between the first and second surfaces S1 and S2 of the first lens 121 may be 10 mm or less, for example, 7 mm or less. Accordingly, the difference in curvature radius between the object-side surface and the sensor-side surface of each of the first, sixth, and seventh lenses (121, 126, and 127) having an aspherical surface can be set to 5 mm or less.

As shown in FIG. 27 , the angle (CRA) of the main ray in the optical system and camera module of FIG. 21 may be 10 degrees or more, for example, in the range of 10 degrees to 35 degrees or in the range of 10 degrees to 25 degrees. As shown in Figure 33, it can be seen that the peripheral light ratio is 70% or more, for example, 75% or more from the center of the image sensor to the end of the diagonal. In other words, it can be seen that there is almost no difference in ambient illuminance (Zoom

positions

1, 2, 3) up to 4.4 mm from the optical axis according to the temperature change from low to high temperature.

Figures 28 to 30 are graphs showing diffraction MTF at room temperature, low temperature, and high temperature in the optical system of Figure 21, and are graphs showing luminance ratio (modulation) according to spatial frequency. 27 to 29, in the third embodiment of the invention, the deviation of MTF from low or high temperature based on room temperature may be less than 10%, that is, 7% or less. Figures 31 to 33 are graphs showing aberration characteristics at room temperature, low temperature, and high temperature in the optical system of Figure 21. 31 to 33 are graphs measuring spherical aberration, astigmatic field curves, and distortion from left to right. The graph for spherical aberration is a graph for light in a wavelength band of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graph for astigmatism and distortion aberration is a graph for light in a wavelength band of about 546 nm. In the aberration diagrams of FIGS. 31 to 33, it can be interpreted that the closer each curve at room temperature, low temperature, and high temperature is to the Y-axis, the better the aberration correction function is. The optical system 1000 according to the third embodiment can be used in most cases. You can see that the measured values in the area are adjacent to the Y axis. Accordingly, it can be seen that the decrease in luminance ratio (modulation) from the low temperature to the high temperature in FIGS. 30 to 32 is less than 10%, for example, 5% or less, or is almost unchanged.

Table 5 compares changes in optical properties such as EFL, BFL, F number, TTL, and FOV at room temperature, low temperature, and high temperature in the optical system according to the first embodiment, and the change rate of optical properties at low temperature is 5% based on room temperature. Hereinafter, it can be seen that the change rate of optical properties at low temperatures is 5% or less, for example, 3% or less based on room temperature.

	상온room temperature	저온low temperature	고온High temperature	저온/상온Low temperature/room temperature	고온/상온High temperature/room temperature
EFL(F)EFL(F)	15.800 15.800	15.770 15.770	15.838 15.838	99.81%99.81%	100.24%100.24%
BFLBFL	2.414 2.414	2.411 2.411	2.417 2.417	99.88%99.88%	100.14%100.14%
F#F#	1.600 1.600	1.597 1.597	1.604 1.604	99.82%99.82%	100.23%100.23%
TTLTTL	40.000 40.000	39.941 39.941	40.069 40.069	99.85%99.85%	100.17%100.17%
FOVFOV	32.418 32.418	32.454 32.454	32.374 32.374	100.11%100.11%	99.86%99.86%

Therefore, as shown in Table 5, the change in optical properties according to the temperature change from low to high temperature, for example, the rate of change in effective focal length (EFL), TTL, BFL, and F number angle of view (FOV) is 10% or less, that is, 5 % or less, for example, can be seen to be in the range of 0 to 5%. Even if at least one or two plastic lenses are used, temperature compensation for the plastic lenses is designed to prevent deterioration in the reliability of optical characteristics.

The optical system 1000 according to the third embodiment may satisfy at least one or two of the equations described below. When 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, and provides good optical performance not only in the center but also in the periphery of the field of view (FOV). You can have it. Additionally, the optical system 1000 may have improved resolution. In addition, the meaning of the thickness of the lens at the optical axis (OA) and the distance between the adjacent lenses at the optical axis (OA) described in the equations may refer to the embodiment disclosed above.

[Equation 84] 0.5 < CT6 / CT7 < 2

Equation 84 sets the center thickness difference between the 6th and 7th lenses, which are plastic lenses, to improve chromatic aberration of the optical system, and preferably satisfies 1 ≤ CT6 / CT7 < 1.5. Additionally, the manufacturing precision of the sixth and seventh lenses can be reduced, and the optical performance of the center and periphery of the field of view (FOV) can be improved.

[Equation 85] 0.5 < CT1 / ET1 < 2

In Equation 85, CT1 means the thickness (mm) at the optical axis (OA) of the first lens 121, and ET1 means the thickness at the edge of the first lens 121, that is, the end of the effective area. do. Equation 85 sets the center thickness and edge thickness of the first lens, so that factors affecting the angle of view of the optical system can be set, and factors affecting the effective focal length (EFL) can be set, preferably 1 ≤ CT1 / ET1 < 1.25 can be satisfied.

[Equation 86] Po1 > 0

In Equation 86, Po1 is expressed as the positive refractive power of the first lens 121, and can be set to have a shorter effective focal length compared to TTL in the optical system for the performance of the optical system. Accordingly, the condition of TTL > F may be satisfied, and for example, TTL may be in the range of 1.5 times or more, for example, 1.5 to 4 times the effective focal length (F).

[Equation 87] 1.7 < n1 < 2.2

In Equation 87, n1 is the refractive index at the d-line of the first lens 121. Equation 87 sets the refractive index of the first lens high, so that factors affecting the reduction of third-order aberration (Seidel aberration) of the optical system can be adjusted, and aberrations that occur as the TTL becomes somewhat longer can be reduced. Equation 4 preferably satisfies 1.75 < n1 < 2.1. If designed lower than the lower limit of Equation 4, the performance of reducing aberrations can be obtained, and the refractive power of the first lens becomes weak and cannot collect light, which may deteriorate the performance of the optical system. If the value of Equation 87 is designed to be higher than the upper limit, there is a disadvantage in that it becomes difficult to obtain materials. In addition, when the refractive index of the first lens 121 is designed to be lower than the lower limit of Equation 87, the radius of curvature of the first and second lenses must be increased in order to increase the refractive power of the first and second lenses. In this case, lens production becomes more difficult, the lens defect rate increases, and yield may decrease.

[Equation 87-1] 1.6 ≤ Aver(n1:n7) ≤ 1.7

In Equation 87-1, Aver(n1:n7) is the average of the refractive index values in the d-line of the first to seventh lenses. When the optical system 1000 according to the embodiment satisfies Equation 87-1, the optical system 1000 can set the resolution and suppress the influence on TTL.

[Equation 87-2]

1 < GLn_Aver/PLn_Aver < 1.2

GLn_Aver is the average refractive index of the glass lenses in the lens unit 100B, and PLn_Aver is the average refractive index of the plastic lenses. Lens(s) with a high refractive index can be placed on the object side of the plastic lens to increase color dispersion.

[Equation 88] 20 < FOV_H < 40

In Equation 88, FOV_H represents the horizontal angle of view, and the range of the vehicle optical system can be set. Equation 88 preferably satisfies 25 ≤ FOV_H ≤ 35 or satisfies the range of 29.8 degrees ± 3 degrees, and in this case, the sensor length in the horizontal direction can be based on 8.064 mm ± 0.5 mm. In addition, when Equation 88 is satisfied, when the temperature changes from room temperature to high temperature, the rate of change of the effective focal distance and the change rate of the angle of view can be set to 5% or less, for example, 0 to 5%. In addition, even if one or more plastic lenses, for example, two or more plastic lenses are mixed and used in the optical system 1000, degradation of optical characteristics can be prevented through temperature compensation of the plastic lenses.

[Equation 89] L1R1 > 0

If Equation 89 is satisfied, the shape of the optical system can be limited. The object-side surface of the first lens 121 is convex to prevent foreign substances from adhering to or accumulating on the surface. Additionally, since the first lens 121 refracts incident light in the optical axis direction, the effective diameter of the second lens 122 can be reduced. Accordingly, the gap between the first and

second lenses

121 and 122 can be increased.

[Equation 89-1] L1R2 > 0

[Equation 89-2] L2R1 < 0, L2R2 < 0

Since the first lens 121 has a meniscus shape that is convex toward the object, it can refract light up to the edge of the second lens 122, which has a small effective diameter. Additionally, since the second lens 122 has a meniscus shape that is convex toward the sensor, the effective diameter of the bonded lens 134 can be stably secured. In addition, since the condition L3R1 > L2R2 If the condition L3R1 < L2R2

[Equation 89-3] L5R1 > 0, L5R2 < 0

Since the fifth lens has a convex shape on both sides, the effective diameters of the sixth and

seventh lenses

126 and 127 can be refracted so that they are not large, the TTL can be reduced, and the number of lenses can be reduced. In addition, since the condition L5R1 > L5R2 is maintained, light can be adjusted so as not to increase the effective diameter of the sensor lens, that is, the sixth and

seventh lenses

126 and 127, and the TTL can be reduced. If the condition is L3R1 < L3R2, there is a problem in which aberration occurs between the object-side surfaces of the first lens and the second lens, the effective diameter of the sensor-side lenses increases, or the TTL increases.

[Equation 90] 2 < L7S2_max_sag to Sensor < 6

In Equation 90, L7S2_max_sag to Sensor may be the straight line distance from the maximum Sag value of the seventh lens 127 to the image sensor 300. If this is satisfied, TTL can be reduced and conditions for manufacturing a camera module can be set. Additionally, L7S2_max_sag to Sensor can set a space where the filter 500 and the cover glass 400 located between the image sensor 300 and the seventh lens 127 can be placed. If the range of Equation 7 is smaller than the lower limit, the space for placing circuit structures such as filters and image sensors becomes limited, making the process of assembling circuit structures such as filters and image sensors into the optical system difficult. If the range of Equation 90 is larger than the upper limit, the process of assembling circuit structures such as filters and image sensors into the optical system is easy, but the TTL becomes longer, making it difficult to miniaturize the optical system. That is, Equation 90 can set the minimum distance between the image sensor 300 and the last lens, and preferably satisfies 4 < L7S2_max_sag to Sensor < BFL. Additionally, since the last lens has a concave radius of curvature on the sensor side, it can refract light into the effective area of the image sensor 300. The BFL is the optical axis distance from the image sensor 300 to the center of the sensor side of the last lens. In detail, if 4.2 < L7S2_max_sag to Sensor < 5 is satisfied, it is easier to manufacture and reduce TTL.

[Equation 91] 0.1 < CT1 / CT7 < 5

If Equation 91 is satisfied, the aberration characteristics can be improved and the influence on the reduction of the optical system can be set. Equation 91 may preferably satisfy 0.5 < CT1 / CT7 < 1. Equation 91 sets the lenses on both sides of the optical system to be a glass lens and a plastic lens, and can limit the difference in center thickness between them. Accordingly, chromatic aberration of the optical system can be improved, good optical performance can be achieved at a set angle of view, and TTL (total track length) can be controlled.

[Equation 91-1] 0 < CT1/CA11 < 1

In Equation 91, the central thickness (CT1) of the first lens 121 and the effective diameter (CA11) of the object side surface (S1) of the first lens 121 can be set. If these are satisfied, injection molding of glass material can be performed. Deterioration of the strength and optical properties of the lens can be prevented. If it is lower than the range of Equation 1, the lens may be damaged or injection molding is difficult, and if it is larger than the above range, the TTL may increase and the weight of the optical system may become heavy. Preferably, 0 < CT1/CA11 < 0.5 may be satisfied.

[Equation 92] 0 < CT1 / CT6 < 3

In Equation 92, CT6 means the central thickness of the sixth lens 126. If the optical system satisfies Equation 92, the aberration characteristics can be improved and the effect on the reduction of the optical system can be set. Equation 9 may preferably satisfy 0 < CT1 / CT6 < 1. Equation 92 sets the difference between the center thicknesses of the first and sixth lenses, thereby improving the chromatic aberration of the optical system.

[Equation 93] 1 < CT34 / CT6 < 5

In Equation 93, CT34 is the central thickness of the third and fourth lenses. If the optical system satisfies Equation 93, the thickness of the bonded lens and the sixth lens 126 made of plastic can be set to improve aberration characteristics, preferably 1 < CT34 / CT6 < 4 or 1 < CT34 / CT6 ≤ 2.5 can be satisfied. The CT34 may be larger than the central thickness of each of the first to seventh lenses. Here, the condition CT34 > ET34 can be satisfied.

[Equation 94] 0 < L2R1 / L4R2 < 1

When the optical system 1000 according to the embodiment satisfies Equation 11, the aberration characteristics of the optical system 1000 may be improved.

[Equation 95] 0 < CT34 - ET34 < 2

In Equation 95, ET34 is the optical axis distance from the end of the effective area of the object-side surface of the third lens 123 to the end of the effective area of the sensor-side surface of the fourth lens 124. If the optical system satisfies Equation 95, the aberration characteristics can be improved by setting the center thickness and edge thickness of the bonded lens, and preferably 0.5 ≤ CT34 / ET34 < 1.5. The ET34 may be greater than the edge thickness of each of the first to seventh lenses.

[Equation 96] 0 < CA11 / CA31 < 2

When Equation 96 is satisfied, the optical system 1000 can control incident light and set factors affecting aberration. Preferably, 1 < CA11 / CA31 < 1.8 can be satisfied.

[Equation 97] 0 < CA72 / CA42 < 2

If Equation 97 is satisfied, the optical system 1000 can control the incident light path and set factors for performance change according to CRA and temperature. Preferably, Equation 97 may satisfy 0.4 < CA72 / CA_L4S2 < 1.0.

[Equation 98] 0 < CA12 / CA21 < 2

If Equation 98 is satisfied, the optical system 1000 can control the light traveling to the first lens group (LG1) and the second lens group (LG2) and set factors that affect reduction of lens sensitivity. . Equation 98 may preferably satisfy 1 < CA12 / CA21 < 1.8.

[Equation 99] 0 < CA31 / CA42 < 2

When the optical system 1000 satisfies Equation 99, the effective diameter of the bonded lens can be set to be smaller than the effective diameter of the first lens 121 and larger than the effective diameter of the seventh lens 127. Equation 99 may preferably satisfy 0 ≤ CA31 / CA42 < 1.

[Equation 100] 0 < CA31 / CA32 < 2

If the optical system 1000 satisfies Equation 100, the optical system 1000 can improve chromatic aberration and set the size between the object-side surface and the sensor-side surface of the object-side third lens within the bonded lens. . Accordingly, by setting the effective diameter size of the third lens disposed closer to the object than the plastic lens(s), light incident through the bonded lens can be effectively guided to the plastic lens. Equation 100 may preferably satisfy 0 ≤ CA31 / CA32 < 1. That is, the effective diameter size is designed to gradually decrease from the fourth lens to the sixth lens made of plastic, so that light can be refracted and guided to the sixth and seventh lenses, which have relatively small effective diameters.

[Equation 100-1] CA4 > CA_PL1

In Equation 10-1, CA4 is the effective diameter (average effective diameter) size of the fourth lens 124, and CA_PL1 is the effective diameter (average effective diameter) size of the plastic lens closer to the object side than the sensor when two plastic lenses exist. You can.

[Equation 101] 0 < CA41 / CA42 < 2

If the optical system 1000 satisfies Equation 18, the optical system 1000 can improve chromatic aberration, and the size between the object-side surface and the sensor-side surface of the fourth lens on the sensor side within the bonded lens 134 can be adjusted. You can set it. Accordingly, the effective diameter size of the fourth lens closer to the object than the plastic lens(s) can be set. Equation 101 may preferably satisfy 0 < CA51 / CA52 < 1.5.

[Equation 101-1] 1.7 < CA61 - CA62 < 4

In Equation 101-1, the effective diameter difference between the object side surface (L6S1) and the sensor side surface (L6S2) of the sixth lens may exceed 1.7, and may be larger than the effective diameter difference (mm) of other lenses, and may be the maximum in the optical system. It can be. Accordingly, by setting the effective diameter difference between the object side and the sensor side of the first plastic lens to the maximum, the light refracted through the sixth lens can be guided to the effective area of the last lens.

[Equation 101-2] CA5 > CA4 > CA6

[Equation 101-3] CA41 > (Imgh*2)

[Equation 101-4] CA51 ≥ (Imgh*2)

[Equation 101-5] CA62 < (Imgh*2)

In Equations 101-2 to 101-5, the effective diameter of the fifth lens 125, the effective diameter of the object-side surface of the fourth lens 124, and the effective diameter of the object-side surface of the fifth lens 125 are the image sensor 300. You can set the optical path to the area of .

In the embodiment, the fifth lens is a glass lens disposed on the object side of the plastic lens, and is disposed closest to the plastic lens, so the effective diameter ratio of the object side surface of the fifth lens and the sensor side surface is Equation 101 -2 or 101-4 can be satisfied. Alternatively, if the plastic lens closest to the object side is placed at the n-3rd, n-4th, or n-5th position (n=6 to 8), then the n-3th, n-4th, or n-5th is disposed on the object side of the plastic lens, and the effective diameter ratio of the object side (GL1_S1) and the sensor side (GL1_S2) of the glass lens closest to the plastic lens satisfies 1 < CA_GL1_S1/ CA_GL1_S2 < 2, or 1.7 < CA_GL1_S1 - The effective diameter difference (mm) of CA_GL_S2 < 3 can be satisfied.

Equation 101 can further satisfy Equation 101-6.

[Equation 101-6] 1.1 ≤ Last_GL_CAS1 / Last_GL_CAS2 ≤ 1.5

In Equation 101-6, Last_GL_CAS1 represents the effective diameter (CAS1) of the object side of the last glass lens (Last_GL) in the optical system, and Last_GL_CAS2 represents the effective diameter (CAS2) of the sensor side of the last glass lens (Last_GL) in the optical system.

[Equation 101-7] 2 < L5R1 / (CA51/2) < 5

When the biconvex fifth lens 125 satisfies Equation 101-7, the optical system 1000 can improve chromatic aberration. If it is less than the lower limit value of Equation 101-7, the occurrence of aberration by the 9th side increases, and if it is larger than the upper limit value, the occurrence of aberration by the 9th side decreases, but the radius of curvature of the 10th side must be smaller. , the occurrence of aberrations increases in the 10th surface, and there is a problem affecting the aberrations of the 6th and 7th lenses. Preferably, if the range of 2 < L3R1 / (CA31/2) < 3 is satisfied, the radius of curvature of the sixth surface (S6) can be designed to be large while reducing the aberration occurring in the fifth surface (S5). It is easy to manufacture the third lens 123. Aberrations occurring in the optical system can be reduced, manufacturing of the third lens 123 can be made easier, and yield can be increased.

[Equation 102] 0.2 < CA_GL_AVER/CA_PL_AVER < 2.2

In Equation 102, CA_GL_AVER represents the average effective diameter of glass lenses, and CA_PL_AVER represents the average effective diameter of plastic lenses. By setting the effective diameter size of the glass lens and the effective diameter size of the plastic lens in Equation 102, the path of incident light can be effectively guided. Equation 102 may preferably satisfy 1.1 < CA_GL_AVER/CA_PL_AVER < 1.5. Here, nGL > nPL can be satisfied. The nGL is the number of glass lenses, and nPL is the number of plastic lenses.

[Equation 103] 1.1 ≤ GL_CAS1_AVER/PL_CAS1_AVER ≤ 1.6

In Equation 103, GL_CAS1_AVER is the average effective diameter of the object-side surfaces of the glass lenses, for example, the average effective diameter of the object-side surfaces of the first to fifth lenses. PL_CAS1_AVER is the average effective diameter of the object-side surfaces of the plastic lenses, for example, the average effective diameter of the object-side surfaces of the sixth and seventh lenses. Since the effective diameter size of the plastic lens is designed to be relatively small compared to the glass lens, Equation 20 can be satisfied. This is because the effective diameter of the sensor side of the lens closest to the plastic lens, that is, the fifth lens, is small and the radius of curvature of the sixth lens is designed to be small, so that light can be guided to the effective area of the plastic lens, which has a relatively small effective diameter. Accordingly, it is possible to design where the average of the object-side surfaces of the glass material is larger than the effective diameter of the object-side surface of the plastic lens. Equation 103 may preferably satisfy 1.20 ≤ GL_CAS1_AVER/PL_CAS1_AVER ≤ 1.55.

[Equation 104] CA6, CA7 < CA5

If Equation 104 is satisfied, the optical system sets the effective diameter of the plastic lens disposed between the fifth lens 125 and the image sensor 300 to be smaller than the effective diameter of the fifth lens 125, so that the size of the effective diameter of the image sensor 300 It can guide light to the center and periphery and improve chromatic aberration.

[Equation 105] CG2 < CG6 < CG1

In Equation 105, CG2 may be the center spacing of the second and third lenses, CG6 may be the center spacing of the sixth and seventh lenses, and CG1 may be the center spacing of the first and second lenses. If Equation 22 is satisfied, the center spacing between the first, second, sixth, and seventh lenses can be set, thereby reducing the center spacing and improving the optical performance of the peripheral part of the field of view (FOV).

[Equation 105-1] G4 <0.01 or CG4 <0.01

In Equation 105-1, G4 and CG4 can set the distance between the third lens 123 and the fourth lens 124 and the center distance. The G4 may include a gap at the optical axis and/or a gap at the edge. If Equation 105-1 is satisfied, the third and fourth lenses can be set as bonded lenses. Here, preferably, CT34 = CT3 + CT4 + CG3 can be satisfied. You can set the center thickness (CT3, CT4) of the third and fourth lenses and the center spacing (CG3) of the third and fourth lenses.

[Equation 106] 1 < CT7 / CG6 < 4

In Equation 106, CG6 is the center spacing or optical axis distance between the sensor side surface of the sixth lens 126 and the object side surface of the seventh lens 127. In Equation 106, the center thickness (CT7) of the seventh lens 127 and the center spacing between the sixth and seventh lens 127 are set, thereby improving optical performance at the periphery of the angle of view. Equation 106 may preferably satisfy 2.5 < CT7/CG6 < 3.

[Equation 107] 2*CT3 < CT2 < CG1

By setting the center spacing of the first and second lenses and the center thickness of the second lens to the maximum in Equation 107, resolution and chromatic aberration can be improved, and the center spacing between the third to seventh lenses can be reduced to I can give it.

[Equation 108] 2*CT6 < CG1 < 2*CT5

By setting the center thickness of the fifth and sixth lenses in Equation 108, chromatic aberration can be improved and the center spacing between the sensor-side lenses, that is, the third to seventh lenses, can be reduced.

[Equation 108-1] 0.3 < (CT1+CG1+CT2)/TTL < 0.45

Since the center thickness (CT1, CT2) of the first and second lenses and the center distance (CT2) between the first and second lenses are arranged to exceed 30% of TTL, the focal length of the light incident on the optical system and each lens surface It can be designed so that the effective radius is not increased.

[Equation 109] 1 < CT2/CT1 < 4

In Equation 109, by setting the center thickness (CT2) of the second lens to be thicker than the center thickness (CT1) of the first lens, factors affecting aberration can be controlled. Preferably, Equation 109 may satisfy 1.1 < CT2/CT1 < 2.

[Equation 110] 1 < L7R1/CT7 < 20

In Equation 110, the radius of curvature of the object-side surface of the seventh lens and the central thickness (CT7) of the seventh lens are set to control the refractive power of the seventh lens. Accordingly, good optical performance can be achieved in the center and periphery of the angle of view. Preferably, Equation 110 may satisfy 1 < L7R1 / CT7 < 10.

[Equation 111] 0 < ｜ L5R2/L7R1 ｜ < 10

In Equation 111, the radius of curvature of the sensor-side surface of the fifth lens and the radius of curvature of the object-side surface of the seventh lens can be set to control the refractive power of the fifth and seventh lenses. Accordingly, good optical performance can be achieved in the center and periphery of the angle of view. Preferably, Equation 111 may satisfy 1 < | L5R2 / L7R1 | < 7.

[Equation 112] L3R1*L4R2 < 0

In Equation 112, L3R1 is the radius of curvature of the object-side surface of the third lens, and L4R2 is the radius of curvature of the sensor-side surface of the fourth lens. If Equation 112 is satisfied, the refractive power of the bonded lens can be controlled to control the light path incident on the plastic lens. Equation 112 can satisfy the condition of 100 < ｜L4R1*L5R2｜.

[Equation 113] 0< ｜L5R1/L4R2｜ < 2

In Equation 113, L5R1 means the radius of curvature of the object-side surface of the fifth lens. In Equation 113, by setting the radius of curvature of the sensor-side surface of the fourth lens and the object-side surface of the fifth lens, light can be effectively refracted from the bonded lens toward the plastic lens. Equation 113 may preferably satisfy 0<L5R1/L4R2<1.

[Equation 113-1] ｜LR｜_Min < PL1_R1

Here, ｜LR｜_Min refers to the minimum radius of curvature among all lenses, and PL1_R1 refers to the radius of curvature of the object side surface of the plastic lens closest to the object side. If Equation 113-1 is satisfied, the plastic lens is placed closer to the sensor than the sensor side of the glass lens with the minimum radius of curvature, and can refract light toward the incident surface of the plastic lens.

[Equation 114] 0 < L6R2/L6R1 < 2

By setting the radius of curvature of the object-side surface and the sensor-side surface of the sixth lens in Equation 114, the plastic lens can effectively refract the incident light toward the image sensor. Equation 114 may preferably satisfy 0 < | L6R2/L6R1 | < 1. Here, the conditions L6R1 > 0, L6R2 > 0, and L6R1 < L6R2 can be satisfied.

[Equation 114-1] 0 < L7R1 / L7R2 < 2

In Equation 114-1, L7R1 and L7R2 mean the radius of curvature of the object side surface and the sensor side surface of the seventh lens. By setting the radius of curvature of the object-side surface and the sensor-side surface of the seventh lens in Equation 114-1, light can be refracted to the image sensor 300 through the plastic lens. Equation 114-1 may preferably satisfy 0 < | L7R1/L7R2 | < 1. Here, the conditions L7R1 > 0, L7R2 > 0, and L7R2 < L7R1 can be satisfied.

[Equation 114-2] 0.5 < L6R1 / L7R1 < 1.5

[Equation 114-3] 0.5 < L7R2 / L6R1 < 1.5

By reducing the difference in radius of curvature between the lens surfaces of the sixth lens 126 and the seventh lens 127, light can be stably guided toward the image sensor 300.

[Equation 115] 0 < CT_Max / CG_Max < 5

In Equation 115, the maximum center thickness (CT_Max) of the lenses and the maximum spacing (CT_Max) between adjacent lenses can be set. If Equation 115 is satisfied, the optical system can have good optical performance at the focal length at the set angle of view and can reduce TTL. Preferably, 0 < CT_Max/CG_Max < 1 may be satisfied.

[Equation 116] 1 < ΣCT / ΣCG < 5

Equation 16 can satisfy 2 < ΣCT / ΣCG < 4.5.

[Equation 117] 8 < ΣNd <30

Equation 117 may preferably satisfy 10 < ΣNd < 20.

[Equation 118] 10 < ΣVd / ΣNd < 50

Equation 118 can satisfy 10 < ΣVd / ΣNd <40.

[Equation 119] Distortion < 2

Equation 119 can satisfy Distortion ≤ 1.5.

[Equation 120] 0 < ΣCT / ΣET < 2

Equation 120 can satisfy 0.5 < ΣCT / ΣET < 1.5.

[Equation 121] 0.5 < CA11 / CA_min < 2.5

Equation 121 may preferably satisfy 1 < CA11 / CA_min < 2.

[Equation 122] 0.5 < CA_max / CA_min < 2

Equation 122 can satisfy 1 < CA_max / CA_min < 2. Here, the maximum effective diameter is the second surface (S2) of the first lens 121, and the minimum effective diameter is the 14th surface (S14) of the seventh lens 127.

[Equation 123] 1 < CA_max / CA_Aver < 3

Equation 123 can satisfy 1 < CA_max / CA_Aver < 1.5.

[Equation 124] 0.5 < CA_min / CA_Aver < 2

Equation 124 can satisfy 0.5 < CA_min / CA_Aver < 1.

[Equation 125] 1 < CA_max / (2*ImgH) < 3

Equation 125 can satisfy 1 < CA_max / (2*ImgH) < 2.

[Equation 126] 1 < TD / CA_max < 4

Equation 126 can satisfy 1.5 < TD / CA_max < 3.

[Equation 127] 1 < F / CA61 < 10

In Equation 127, F may be 10 mm or more, for example, in the range of 10 mm to 20 mm. By setting the relationship between the effective focal length and the effective diameter of the object side of the plastic lens in Equation 127, the influence on optical system reduction, such as TTL, can be adjusted. Equation 127 may preferably satisfy 1 < F / CA61 < 5. Here, F1 is 121 mm or more, for example, in the range of 121 mm to 182 mm. F2 is -128mm or less, for example, in the range of -128mm to -193mm. F3 is -17mm or less, for example, in the range of -17m to 27mm. F4 is 13 mm or more, for example, in the range of 13 mm to 21 mm. F5 is greater than 17mm, for example in the range of 17mm to 26mm. F6 is -38mm or less, for example, in the range of 38mm to -57.5mm. F7 is -311mm or less, for example, in the range of -311mm to -467mm. The sum of the focal lengths of the first to sixth lenses may be set to 5 mm or more, for example, in the range of 5 mm to 8 mm. The balance of the respective focal lengths of the first to fifth lenses can suppress differences in focus positions due to temperature changes. Accordingly, it is possible to prevent the optical properties of imaging lenses from being deteriorated due to temperature changes.

The aperture (Stop) is disposed on the water side of the second lens 122. The focal length of the lens placed on the sensor side and closest to the aperture is greater than 0. In an embodiment of the invention, F1, the focal length of the first lens 121, must be designed to be greater than 0. In this case, the first lens 121 collects light and prevents the effective diameters of the third to seventh lenses, which are lenses disposed closer to the sensor than the second lens 122, from increasing. Additionally, TTL can be prevented from becoming longer, enabling miniaturization of the optical system. The composite focal length of a lens placed closer to the sensor than the aperture, that is, a lens placed closer to the sensor than the aperture, is designed to be greater than 0. In an embodiment of the invention, the composite focal length of the third to seventh lenses may be designed to be greater than zero. In this case, the optical system can be miniaturized by reducing the TTL at a horizontal angle of view (FOV_H) of 25 to 35 degrees.

[Equation 128] 0 < F / L1R1 < 1

Equation 128 can satisfy 0.2 ≤ F / L1R1 ≤ 0.85.

[Equation 129] Max_th/Min_th < 3

In Equation 129, Max_th is the thickness of the thickest area of the lens, and Min_th is the thickness of the thinnest area of the lens. Max_th/Min_th is the ratio of the thickest and thinnest thickness of each lens. Max_th, the thickest thickness of the lens, may be the center thickness (CT) of the lens, and Min_th, the thinnest thickness of the lens, may be the edge thickness (ET) of the lens, but the opposite case is also possible. Max_th, the thickest thickness of the lens, may be the edge thickness (ET) of the lens, and Min_th, the thinnest thickness of the lens, may be the center thickness (CT) of the lens. Edge thickness (ET) refers to the thickness at the end of the effective diameter. If Equation 129 is satisfied, the optical system can control the effect on the effective focal length. Equation 129 may preferably satisfy 2 < Max_th/Min_th ≤ 2.8.

Here, the ratio between the maximum thickness and the minimum thickness of the plastic lenses may satisfy the following conditions. Max_PL_th is the thickness value of the thickest area of the plastic lens, and Min_PL_th is the thickness value of the thinnest area of the plastic lens. Max_PL_th may be the center thickness (CT) of the plastic lens, and Min_PL_th may be the edge thickness (ET) of the plastic lens. Edge thickness (ET) refers to the thickness at the end of the effective diameter. The opposite case is also possible. Max_PL_th may be the edge thickness (ET) of the plastic lens, and Min_PL_th may be the center thickness (CT) of the plastic lens. Edge thickness (ET) refers to the thickness at the end of the effective diameter.

Condition 1: 1.0 < Max_PL_th/Min_PL_th < 2.5

If the value of Condition 1 above is less than the lower limit, it is difficult to manufacture a plastic lens. In other words, it is manufactured by injecting high-temperature resin and curing it at low temperature. If the thickness difference is large, the shrinkage may not be uniform as the lens cools at low temperature, resulting in a high surface defect rate. In addition, if the range is larger than the range of

conditions

1 and 2, the plastic lens shrinks and expands as the temperature changes from -40 degrees to 105 degrees, and in this process, the rate of change in the shape of the lens increases significantly, which may deteriorate the performance of the optical system. . Preferably, the conditions 1.0 < PL_CT/PL_ET < 2 or 1.1 < PL_Max_CT/PL_Min_CT < 1.5 may be satisfied.

[Equation 129-1] 3 < Max(EG/CG) < 50

In Equation 129-1, Max(EG/CG) can set the value at which the ratio of the center spacing (CG) and edge thickness (EG) between adjacent lenses is the maximum. If Equation 129-1 is satisfied, the optical system can control the effect on the effective focal length. Equation 129-1 preferably satisfies 10 < Max(EG/CG) ≤ 40. The condition for Max (EG/CG) may be the gap between the 5th and 6th lenses.

[Equation 129-2] 1 < Min(CT/ET) < 1.5

In Equation 129-2, Min(CT/ET) can set the value at which the ratio of the center thickness and edge thickness of each lens is minimum. If Equation 129-2 is satisfied, the optical system can control the effect on the effective focal length. Equation 129-2 preferably satisfies 1 < Min(CT/ET) ≤ 1.1.

[Equation 130] 0 < EPD/L1R1 < 1

If Equation 130 is satisfied, the optical system 1000 can control incident light. Equation 47 may preferably satisfy 0 < EPD/L1R1 ≤ 0.8.

[Equation 131] -10 < F1 / F3 < 0

If Equation 131 is satisfied, resolution can be improved by controlling the refractive power of the first and third lenses, and TTL and effective focal length (EFL) can be affected.

[Equation 131-1] ｜F3｜> F4

[Equation 131-2] ｜F3｜<F6

[Equation 131-3] F5<｜F7｜

In Equations 131-1 to 131-3, the focal length of the fifth lens closest to the plastic lens may be greater than the focal length of the fourth lens and smaller than the focal length of the sixth and seventh lenses. Accordingly, the refractive power of the last glass lens can be controlled and effectively guided to the plastic lens.

[Equation 132] Po3 * Po4 < 0

Po3 is the refractive power value of the third lens, and Po4 is the refractive power value of the fourth lens. That is, the third and fourth lenses have opposite refractive powers, so aberrations can be improved and light can be effectively guided through the plastic lens. If the Po4 * Po5 value is greater than 0, the effect of improving chromatic aberration as a bonded lens may be minimal.

[Equation 132-1] Po1(Po4 * Po5) < 0

[Equation 132-2] F34 > 0

[Equation 132-3] F3*F4 < 0

Po1 is the refractive power value of the first lens, and F34 is the composite focal length of the third and fourth lenses. If Equations 132-1 to 132-3 are satisfied, it is easy to improve the aberration of the optical system using a bonded lens, and incident light can be effectively guided to the plastic lens. Here, since the first and

second lenses

121 and 122 have opposite focal lengths and a dispersion difference between 20 and 60, they can compensate for chromatic aberration.

[Equation 133] 15 < v4-v3 < 60

In Equation 13, v3 is the Abbe number of the third lens, and v4 is the Abbe number of the fourth lens. If Equation 133 is satisfied, the difference in Abbe number between at least two lenses forming the bonded lens can be maintained above a certain value and chromatic aberration can be improved. Equation 133 may preferably satisfy 20 ≤ v4-v3 ≤ 55. If the bonded lens is less than the lower limit of Equation 133, there may be little improvement in the aberration characteristics of the optical system. Accordingly, if the difference in Abbe number between the object-side lens and the sensor-side lens in the bonded lens is 20 or more and 55 or less, aberration characteristics can be improved.

[Equation 134] 0 < F1 / F < 20

Equation 134 sets the relationship between the focal length (F1) of the first lens and the effective focal length (F), so that the TTL of the optical system can be set. Equation 134 may preferably satisfy 5 < F1 / F < 15.

[Equation 135] 0 < ｜ F5/F6 ｜ < 1

Equation 135 may preferably satisfy 0 < F5/F6 | <0.7.

[Equation 136] 0 < ｜ F5/F7 ｜ < 1

Equation 136 may preferably satisfy 0 < ｜ F5/F7 ｜ < 0.2.

[Equation 137] 0 < ｜ F6/F1 ｜ < 1

Equation 137 may preferably satisfy 0.5 <｜ F6/F1 ｜ <0.5.

[Equation 138] 0 < F27/F < 2

By setting the relationship between the composite focal length (F27) and the effective focal length (F) of the second to seventh lenses in Equation 138, the refractive power of the second to seventh lenses can be controlled to improve resolution, and the optical system can be provided in a slim and compact size. Equation 138 may preferably satisfy 0.5 < F27/F < 1.5.

[Equation 139] 0 < ｜ F27 < F6 ｜ < 1

In Equation 139, the relationship between the composite focal length (F27) of the second to seventh lenses and the focal length (F6) of the sixth lens is set, and the composite refractive power of the second to seventh lenses and the refractive power of the plastic lens are adjusted. It can improve resolution and provide an optical system in a slim and compact size. Equation 139 may preferably satisfy 0 < ｜ F27 < F6 ｜ < 0.8.

[Equation 140] 0 < ｜ F27 < F7 ｜ < 1

In Equation 140, the relationship between the composite focal length (F27) of the second to seventh lenses and the focal length (F7) of the seventh lens is set, and the refractive power of the second to seventh lenses and the refractive power of the last plastic lens are adjusted. It can improve resolution and provide an optical system in a slim and compact size. Equation 140 may preferably satisfy 0 < ｜ F27 < F7 ｜ < 0.5.

[Equation 141] 0 < ｜F6 / F ｜ < 5

Equation 141 preferably satisfies 1 < F6 / F < 4.

[Equation 142] F_LG1/F_LG2 > 0

In Equation 142, the relationship between the focal length (F_LG1) of the first lens group (LG1) and the focal length of the second lens group (F_LG2) can be set. The focal length of the first lens group may have a negative value, and the focal length of the second lens group may have a positive value. When Equation 59 is satisfied, the optical system 1000 can improve aberration characteristics such as chromatic aberration and distortion aberration. Equation 142 may preferably satisfy 2 < F_LG1/F_LG2 < 20.

[Equation 143] 1 < nGL /nPL < 4

In Equation 60, by arranging the number nPL of plastic lenses to be 1 times more than the number nGL of glass lenses, the thickness of the optical system can be reduced and more diverse refractive power can be provided through the aspherical surface. Equation 143 may preferably satisfy 1 < nGL /nPL < 3.

[Equation 144] CA2 < CA5 < CA1

In Equation 144, the size relationship between the average effective diameters (CA1, CA2, CA5) of the object side and sensor side of the first, second, and fifth lenses can be established. If Equation 144 is satisfied, the first and second lens groups can be set, and the aberration can be improved through the first lens of the second lens group (LG2). The CA1 may have the maximum effective diameter in the optical system.

[Equation 145] 0 < ΣPL_CT / ΣGL_CT < 1

Equation 145 may preferably satisfy 0 < ΣPL_CT / ΣGL_CT < 0.5.

[Equation 146] 0 < ΣPL_Nd / ΣGL_Nd < 1

In Equation 146, ΣPL_Nd is the sum of the refractive index thicknesses in the d-line of the plastic lens(s), and ΣGL_Nd is the sum of the refractive indices in the d-line of the glass lenses. If Equation 146 is satisfied, the overall resolution can be controlled by setting the refractive index relationship between the plastic lens and the glass lens. Equation 146 may preferably satisfy 0 < ΣPL_Nd / ΣGL_Nd < 0.5.

[Equation 147] 10mm < TTL < 50mm

By setting the TTL in Equation 147 to exceed 10 mm or 20 mm, an optical system for a vehicle can be provided. Equation 147 preferably satisfies the condition of 35mm < TTL < 45mm or TD < TTL.

[Equation 148] 2mm < ImgH

Equation 148 can set the diagonal size (2*ImgH) of the image sensor 300 and provide an optical system having a sensor size for a vehicle. Equation 148 may preferably satisfy 4mm ≤ ImgH < 8mm.

[Equation 149] 2mm < BFL < 7mm

Equation 149 preferably satisfies 2.5mm <BFL ≤6.5mm. If the BFL is less than the range of Equation 149, some of the light traveling to the image sensor may not be transmitted to the image sensor, which may cause resolution deterioration. If the BFL exceeds the range of Equation 149, stray light may enter and the aberration characteristics of the optical system may deteriorate.

[Equation 150] 0.5 < BFL/CG1 < 2

In Equation 150, BFL is set smaller than the distance between the lenses, for example, the center distance between the first and second lenses (CG1), so that installation space for the filter 500 and the cover glass 400 can be secured, and the image sensor 300 ) and the final lens can improve the assembly of components and improve joint reliability. Equation 150 can satisfy 0.5 < BFL / CG1 ≤ 1.

[Equation 151] CG4, CG5, CG6 < BFL

In Equation 151, BFL is greater than the distance between the lenses, for example, the center distance between the 4th and 5th lenses (CG4), the center distance between the 5th and 6th lenses (CG5), and the center distance between the 6th and 7th lenses (CG6). By setting, installation space for the filter 500 and the cover glass 400 can be secured, assembly of components can be improved through the gap between the image sensor 300 and the last lens, and coupling reliability can be improved. In addition, the last lens, the seventh lens, can disperse the incident light into the effective area of the image sensor, but if the BFL does not satisfy Equation 151, some of the ejected light may not be transmitted to the effective area of the image sensor. and, as a result, the resolution may be lowered.

[Equation 152] 3mm < F < 40mm

Equation 152 can set the overall focal length (F) to suit the vehicle optical system. Equation 152 can satisfy 5mm < F < 30mm.

[Equation 153] FOV < 45 degrees

20 degrees ≤ FOV ≤ 40 degrees can be satisfied.

[Equation 154] 1 < TTL / CA_max < 5

Equation 154 may preferably satisfy 1.5 < TTL / CA_max ≤ 4.

[Equation 155] 2 < TTL / ImgH < 15

Equation 155 may preferably satisfy 4 < TTL / ImgH < 10.

[Equation 156] 0.1 < BFL / ImgH < 2

Equation 156 may preferably satisfy 1 < BFL / ImgH < 1.5.

[Equation 157] 1 < TTL / BFL < 20

Equation 157 may preferably satisfy 4 < TTL / BFL < 10.

[Equation 158] 1.5 < TTL/F < 4

Equation 158 can set the total focal length (F) and total optical axis length (TTL) of the optical system 1000. Accordingly, an optical system for a driver assistance system can be provided. Equation 158 may preferably satisfy 2 ≤ TTL / F ≤ 3 or 2.2 ≤ TTL / F ≤ 2.8. When the optical system 1000 according to the embodiment satisfies Equation 158, the optical system 1000 can have an appropriate focal distance in the set TTL range, maintains the appropriate focal distance even when the temperature changes from low to high, and does not form an image. Provides an optical system that can be used. If it is less than the lower limit of Equation 75, it is necessary to increase the refractive power of the lenses, making correction of spherical aberration or distortion aberration difficult, and if it is more than the upper limit of Equation 75, the effective diameter or TTL of the lenses becomes longer, making it difficult to capture images. A problem may arise where the lens system becomes larger.

[Equation 159] 1 < F / BFL < 10

Equation 159 may preferably satisfy 1 < F / BFL < 3.

[Equation 160] 1 < F / ImgH < 5

Equation 160 may preferably satisfy 2 < F / ImgH < 4.1.

[Equation 161] 1 < F / EPD < 5

Equation 161 can preferably set 1 < F / EPD < 3.

[Equation 162] 0 < BFL/TD < 0.3

Equation 162 may preferably satisfy 0 < BFL/TD < 0.2. If the condition value of BFL/TD is more than 0.2, BFL is designed to be large compared to TD, so the size of the entire optical system becomes large, making it difficult to miniaturize the optical system, and the distance between the seventh lens and the image sensor becomes longer. , As a result, the amount of unnecessary light may increase through between the seventh lens and the image sensor, and there is a problem of lowering resolution, such as lowering aberration characteristics.

[Equation 163] 0 < EPD/Imgh/FOV < 0.2

Equation 163 may preferably satisfy 0 < EPD/Imgh/FOV < 0.1.

[Equation 164] 5 < FOV / F# < 40

Equation 164 may preferably satisfy 10 < FOV / F # < 30. Here, F# can be set to 1.6 or less to provide a bright image.

[Equation 165] 1 < ΣGL_CT / F# < 20

Equation 165 may preferably satisfy 5 < ΣGL_CT / F# < 10.

[Equation 166] 1 < ΣPL_CT / F# < 20

Equation 166 may preferably satisfy 5 < ΣPL_CT / F# < 10.

[Equation 167] 1 < ΣGL_Nd / F# < 20

Equation 167 can establish the relationship between the sum of refractive indices (ΣGL_Nd) and the F number (F#) of the glass lenses of the optical system. Equation 167 may preferably satisfy 1 < ΣGL_Nd / F# < 10.

[Equation 168] 1 < ΣPL_Nd / F# < 10

Equation 168 can establish the relationship between the refractive index sum (ΣPL_Nd) and the F number (F#) of the plastic lenses of the optical system. Equation 168 may preferably satisfy 1 < ΣPL_Nd / F# < 5.

[Equation 169] 0.5 < 0 < Max_Sag61/Max_Sag62 < 0.5 < 1.5

In Equation 169, Max_Sag61 is the maximum Sag value on the object side of the sixth lens, and Max_Sag62 is the maximum Sag value on the sensor side of the sixth lens. If Equation 169 is satisfied, the refractive power can be improved by adjusting the thickness and radius of curvature of the sixth lens. Equation 169 may preferably satisfy 0.8 < Max_Sag61/Max_Sag62 < 1.2.

[Equation 170] 0.5 < Max_Sag71/Max_Sag72 < 1.5

In Equation 170, Max_Sag71 is the maximum Sag value on the object side of the seventh lens, and Max_Sag72 is the maximum Sag value on the sensor side of the seventh lens. If Equation 170 is satisfied, the refractive power can be improved by adjusting the thickness and radius of curvature of the seventh lens. Equation 170 may preferably satisfy 0.8 < Max_Sag71/Max_Sag72 < 1.2.

Here, the maximum Sag values of the 6th and 7th lenses may satisfy the following conditions.

1) Max_Sag61 > Max_Sag71

2) Max_Sag62 > Max_Sag72

[Equation 171] 0 < CG6 / G6_min < 10

In Equation 171, CG6 is the center spacing between the 6th and 7th lenses, and G6_Min is the minimum spacing between the 6th and 7th lenses. Accordingly, the gap between the two plastic lenses can be set. Preferably, 3 < CG6 / G6_min < 7 may be satisfied.

[Equation 172] 0.05<｜Sag_i / (CA_i/2)｜ < 0.2 (i=S1,S2,S3,S4)

Equation 172 can set the relationship between the Sag value and the effective diameter (CA) of the first to fourth surfaces (S1, S2, S3, S4) of the first and second lenses, and if this is satisfied, the refractive power of the lenses is improved. I can give it. Here, Equation 172 shows that if the condition of n1 > 1.7 is further satisfied, the first and second lenses (121, 122) collect light with sufficient power even without sharply designing the curvature radius of the first and second lenses within the effective diameter. It is possible to give.

[Equation 173]

In Equation 173, 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 refer to aspheric constants.

The optical system 1000 according to the third embodiment may satisfy at least one or two of the equations, has improved optical characteristics, improved resolution, and can improve aberration and distortion characteristics. In addition, the optical system 1000 can secure a back focal length (BFL) for applying the automotive image sensor 300, compensate for the decrease in optical characteristics due to temperature changes, and the last lens and image sensor 300. ) can be minimized, allowing for good optical performance in the center and periphery of the field of view (FOV).

Table 6 shows the items of the above-described mathematical equations in the optical system 1000 of the embodiment, including TTL, BFL, effective focal length (F), ImgH (mm), effective diameter (CA) (mm), Thickness (mm), TTL (mm), TD (mm), which is the optical axis distance from the first surface (S1) to the 14th surface (S14), and the focal length (F1-F7) of each of the first to seventh lenses. (mm), sum of refractive indices, sum of Abbe numbers, sum of thickness (mm), sum of spacing between adjacent lenses, effective diameter characteristics, sum of refractive indices of glass lenses, sum of refractive indices of plastic materials, angle of view (FOV) (Degree), edge thickness (ET), focal length, F number, etc. of the first and second lens groups.

항목item	값value	항목 item	값value
FF	15.800015.8000	ET1ET1	2.5442.544
F1F1	151.281151.281	ET2ET2	5.2665.266
F2F2	-161.097-161.097	ET3ET3	3.2563.256
F3F3	-22.431-22.431	ET4ET4	2.1402.140
F4F4	17.26517.265	ET5ET5	2.2242.224
F5F5	21.39521.395	ET6ET6	3.3273.327
F6F6	-47.730-47.730	ET7ET7	3.2713.271
F7F7	-389.233-389.233	F-numberF-number	1.6001.600
F_LG1F_LG1	151.281151.281	FOVFOV	32.41832.418
F_LG2F_LG2	15.25715.257	EPDE.P.D.	9.8759.875
ΣIndexΣIndex	11.73911.739	BFLBFL	5.9365.936
ΣAbbeΣAbbe	11.43911.439	TDTD	34.06434.064
ΣCTΣCT	366.689366.689	ImgHImgH	4.6304.630
ΣCGΣCG	25.17125.171	SDSD	18.61818.618
CA_maxCA_max	15.53315.533	TTLTTL	32.41832.418
CA_minCA_min	8.6218.621	ΣGL_NdΣGL_Nd	8.2228.222
CA_AverCA_Aver	11.86711.867	ΣPL_NdΣPL_Nd	3.2173.217
CT_maxCT_max	4.9974.997	이미지 센서image sensor	3840216038402160
CT_minCT_min	2.0002.000	F15F15	16.41816.418
CT_AverCT_Aver	3.5963.596	F67F67	-38.086-38.086

Table 7 shows the result values for Equations 84 to 133 described above in the optical system 1000 of the embodiment. Referring to Table 7, it can be seen that the optical system 1000 satisfies at least one, two, or three of Equations 84 to 133. Accordingly, the optical system 1000 can have good optical performance in the center and periphery of the field of view (FOV) and can have excellent optical characteristics.

수학식math equation		값value
8484	0.5 < CT6 / CT7 < 20.5 < CT6 / CT7 < 2	1.0751.075
8585	0.5 < CT1 / ET1 < 20.5 < CT1 / ET1 < 2	1.1791.179
8686	Po1 < 0Po1 < 0	0.0070.007
8787	1.7 < n1 <2.21.7 < n1 < 2.2	1.8561.856
8888	20 <FOV_H < 4020 <FOV_H<40	29.800 29.800
8989	L1R1 > 0L1R1 > 0	19.995 19.995
9090	2 < L7S2_max_sag to Sensor < 62 < L7S2_max_sag to Sensor < 6	4.5094.509
9191	0.1 < CT1 / CT7 < 50.1 < CT1 / CT7 < 5	0.9350.935
9292	0 < CT1 / CT6 < 30 < CT1 / CT6 < 3	0.8700.870
9393	1 < CT34 / CT6 < 51 < CT34 / CT6 < 5	1.8431.843
9494	0 < L2R1 / L4R2 < 10 < L2R1 / L4R2 < 1	0.3300.330
9595	0 < (CT45 - ET45) < 20 < (CT45 - ET45) < 2	1.9521.952
9696	0 < CA11 / CA31 < 20 < CA11 / CA31 < 2	1.3891.389
9797	0 < CA72 / CA42 < 20 < CA72 / CA42 < 2	0.6730.673
9898	0 < CA12 / CA21 < 20 < CA12 / CA21 < 2	1.3441.344
9999	0 < CA31 / CA42 < 20 < CA31 / CA42 < 2	0.8740.874
100100	0 < CA31 / CA32 < 20 < CA31 / CA32 < 2	0.9380.938
101101	0 < CA41 / CA42 < 20 < CA41 / CA42 < 2	0.9310.931
102102	0.2 < CA_GL_AVER/CA_PL_AVER < 2.20.2 < CA_GL_AVER/CA_PL_AVER < 2.2	1.2181.218
103103	1.10 < GL_CAS1_AVER/PL_CAS1_AVER < 1.601.10 < GL_CAS1_AVER/PL_CAS1_AVER < 1.60	0.0000.000
104104	CA6, CA7 < CA5CA6, CA7 < CA5	만족Satisfaction
105105	CG2 < CG6 < CG1CG2 < CG6 < CG1	만족Satisfaction
106106	1 < CT7 / CG6 < 41 < CT7 / CG6 < 4	2.8052.805
107107	(2CT3) < CT2 < CG1(2CT3) < CT2 < CG1	만족Satisfaction
108108	2CT6 < CG1 < 2CT52CT6 < CG1 < 2CT5	만족Satisfaction
109109	1 < CT2/CT1 < 41 < CT2/CT1 < 4	1.6661.666
110110	1 < L7R1/CT7 < 201 < L7R1/CT7 < 20	2.8522.852
111111	0 < ｜ L5R2 / L7R1 ｜ < 100 < ｜ L5R2 / L7R1 ｜ < 10	4.4474.447
112112	L3R1L4R2 < 0L3R1L4R2 < 0	-1381.423-1381.423
113113	0< ｜L5R1 /L4R2｜ < 20< ｜L5R1 /L4R2｜ < 2	0.4950.495
114114	0 < L6R2/L6R1 < 20 < L6R2/L6R1 < 2	0.6600.660
115115	0 < CT_Max / CG_Max < 50 < CT_Max / CG_Max < 5	0.6710.671
116116	1 < ΣCT / ΣCG < 51 < ΣCT / ΣCG < 5	2.8312.831
117117	8 < ΣIndex <308 < ΣIndex <30	11.43911.439
118118	10 < ΣAbb / ΣIndex <5010 < ΣAbb / ΣIndex <50	32.05732.057
119119	Distortion < 2Distortion < 2	0.478 0.478
120120	0 < ΣCT / ΣET < 20 < ΣCT / ΣET < 2	1.1431.143
121121	0.5 < CA11 / CA_min < 2.50.5 < CA11 / CA_min < 2.5	1.8021.802
122122	1 < CA_max / CA_min < 51 < CA_max / CA_min < 5	1.8021.802
123123	1 < CA_max / CA_Aver < 31 < CA_max / CA_Aver < 3	1.3091.309
124124	0.5 < CA_min / CA_Aver < 20.5 < CA_min / CA_Aver < 2	0.7260.726
125125	1 < CA_max / (2ImgH) < 31 < CA_max / (2ImgH) < 3	1.6771.677
126126	1 < TD / CA_max < 41 < TD / CA_max < 4	2.1932.193
127127	1 < F / CA61 < 101 < F/CA61 < 10	1.2361.236
128128	0 < F / L1R1 < 10 < F / L1R1 < 1	0.7900.790
129129	Max_th/Min_th < 3Max_th/Min_th < 3	2.6612.661
130130	0 < EPD/L1R1 < 10 < EPD/L1R1 < 1	0.4940.494
131131	-10 < F1 / F3 < 0-10 < F1 / F3 < 0	-6.744-6.744
132132	Po3 * Po4 < 0Po3 * Po4 < 0	만족Satisfaction
133133	15 < v4-v3 < 6015 < v4-v3 < 60	6.112 6.112

Table 8 shows the result values for Equations 134 to 172 described above in the optical system 1000 of the fourth embodiment. Referring to Table 6, it can be seen that the optical system 1000 satisfies at least one, two, or three of Equations 134 to 172. Accordingly, the optical system 1000 can have good optical performance in the center and periphery of the field of view (FOV) and can have excellent optical characteristics.

수학식math equation		값value
134134	0 < F1 / F < 200 < F1 / F < 20	9.5759.575
135135	0 < ｜ F5 /F6 ｜ < 10 < ｜ F5 /F6 ｜ < 1	0.4480.448
136136	0 < ｜ F5 /F7 ｜ < 10 < ｜ F5 /F7 ｜ < 1	0.0550.055
137137	0 < ｜ F6 / F1 ｜ < 10 < ｜ F6 / F1 ｜ < 1	0.3160.316
138138	0 < F27 / F < 20 < F27 / F < 2	0.9660.966
139139	0 < ｜ F27 < F6 ｜ < 10 < ｜ F27 < F6 ｜ < 1	0.3200.320
140140	0< ｜ F27 < F7 ｜ < 10< ｜ F27 < F7 ｜ < 1	0.0390.039
141141	0 < ｜F6 / F｜ < 50 < ｜F6 / F ｜ < 5	3.0213.021
142142	F_LG1/F_LG2 > 0F_LG1/F_LG2 > 0	9.9169.916
143143	1 < nGL /nPL < 41 < nGL /nPL < 4	2.5002.500
144144	CA_L2 < CA_L3 > CA_L4CA_L2 < CA_L3 > CA_L4	만족Satisfaction
145145	0 < ΣPL_CT / ΣGL_CT < 10 < ΣPL_CT / ΣGL_CT < 1	0.3600.360
146146	0 < ΣPL_Nd / ΣGL_Nd < 10 < ΣPL_Nd / ΣGL_Nd < 1	0.3910.391
147147	10 < TTL < 5010 < TTL < 50	40.00040.000
148148	2 < ImgH2 <ImgH	4.6304.630
149149	2< BFL < 72<BFL<7	5.9365.936
150150	0.5< BFL / CG1 < 20.5< BFL / CG1 < 2	0.7970.797
151151	CG2, CG3, CG5, CG6 < BFLCG2, CG3, CG5, CG6 < BFL	만족Satisfaction
152152	3 < F < 403 < F < 40	15.80015.800
153153	FOV < 45FOV < 45	32.41832.418
154154	1 < TTL / CA_max < 51 < TTL / CA_max < 5	2.5752.575
155155	2 < TTL / ImgH < 152 <TTL/ImgH<15	8.6398.639
156156	0.1 < BFL / ImgH < 20.1 <BFL/ImgH<2	1.2821.282
157157	1 < TTL / BFL < 201 <TTL/BFL<20	6.7386.738
158158	1.5 < TTL/F < 41.5 < TTL/F < 4	2.5322.532
159159	1 < F / BFL < 101 < F/BFL < 10	2.6622.662
160160	1 < F / ImgH < 51 < F/ImgH < 5	3.4133.413
161161	1 < F / EPD < 51 < F/EPD < 5	1.6001.600
162162	0 < BFL/TD < 0.30 < BFL/TD < 0.3	0.17430.1743
163163	0 < EPD/Imgh/FOV < 0.20 < EPD/Imgh/FOV < 0.2	0.06580.0658
164164	5 < FOV / F# < 405 < FOV / F# < 40	21.35521.355
165165	1 < ΣGL_CT / F# < 201 < ΣGL_CT / F# < 20	7.8167.816
166166	1 < ΣPL_CT / F# < 201 < ΣPL_CT / F# < 20	6.4186.418
167167	1 < ΣGL_Nd / F# < 201 < ΣGL_Nd / F# < 20	5.1395.139
168168	1 < ΣPL_Nd / F# < 101 < ΣPL_Nd / F# < 10	2.0102.010
169169	0 < Max_Sag61/Max_Sag62 < 0.50 < Max_Sag61/Max_Sag62 < 0.5	1.0491.049
170170	0 < Max_Sag71/Max_Sag72 < 0.50 < Max_Sag71/Max_Sag72 < 0.5	0.9640.964
171171	0 < CG6 / G6_min < 10 < CG6 / G6_min < 1	0.2040.204
172172	0.05<｜Sag_i / (CA_i/2)｜ < 0.2 (i=S1,S2,S3,S4)0.05<｜Sag_i / (CA_i/2)｜ < 0.2 (i=S1,S2,S3,S4)	만족Satisfaction

Figure 36 is an example of a top view of a vehicle to which a camera module or optical system is applied according to an embodiment of the invention. Referring to FIG. 36, the vehicle camera system according to an embodiment of the invention includes an image generator 11, a first information generator 12, and a

second information generator

21, 22, 23, 24, 25, 26. ) and a control unit 14. The image generator 11 may include at least one camera module 31 disposed in the host vehicle, and may capture a front image of the host vehicle and/or the driver to generate a front image of the host vehicle or an image of the interior of the vehicle. You can. The image generator 11 may use the camera module 31 to capture not only the front of the vehicle but also the surroundings of the vehicle in one or more directions to generate an image surrounding the vehicle. Here, the front image and peripheral image may be digital images and may include color images, black-and-white images, and infrared images. Additionally, the front image and surrounding image may include still images and moving images. The image generator 11 provides the driver image, front image, and surrounding image to the control unit 14. Next, the first information generator 12 may include at least one radar or/and a camera disposed in the host vehicle, and generates first detection information by detecting the front of the host vehicle. Specifically, the first information generator 12 is disposed in the host vehicle and generates first detection information by detecting the location and speed of vehicles located in front of the host vehicle and the presence and location of pedestrians.

The first detection information generated by the first information generator 12 can be used to control the distance between the own vehicle and the vehicle in front to be kept constant, and when the driver wants to change the driving lane of the own vehicle or reverse parking. The stability of vehicle operation can be improved in certain preset cases, such as when driving. The first information generation unit 12 provides first detection information to the control unit 14. The

second information generators

21, 22, 23, 24, 25, and 26 are based on the front image generated by the image generator 11 and the first sensed information generated by the first information generator 12, Second sensing information is generated by detecting each side of the vehicle. Specifically, the

second information generators

21, 22, 23, 24, 25, and 26 may include at least one radar or/and camera disposed on the host vehicle, and may include positions of vehicles located on the sides of the host vehicle. and speed can be detected or video taken. Here, the second

information generation units

21, 22, 23, 24, 25, and 26 may be disposed at both front corners, side mirrors, and the rear center and rear corners of the vehicle, respectively.

At least one information generator of these vehicle camera systems may include an optical system described in the embodiment(s) disclosed above and a camera module having the same, and may include information acquired through the front, rear, each side, or corner area of the vehicle. It can be provided to the user or processed to protect vehicles and objects from automatic driving or surrounding safety. The optical system of the camera module according to an embodiment of the invention can be mounted in multiple numbers in a vehicle to improve safety regulations, strengthen autonomous driving functions, and increase convenience. Additionally, the optical system of the camera module is used in vehicles as a control component for lane keeping assistance systems (LKAS), lane departure warning systems (LDWS), and driver monitoring systems (DMS). These automotive camera modules can provide stable optical performance despite changes in ambient temperature and provide price-competitive modules to ensure the reliability of automotive components.

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.

Claims

It includes first to seventh lenses aligned along the optical axis from the object side toward the sensor side,

The refractive power of the first lens is negative,

The composite refractive power of the third to seventh lenses is positive,

The first lens has a meniscus shape convex from the optical axis toward the sensor,

The center spacing between the first lens and the second lens is greater than the center thickness of each of the first to seventh lenses,

The first to seventh lenses include a plurality of spherical lenses and a plurality of aspherical lenses,

The spherical lens is a lens whose object-side surface and sensor-side surface are spherical at the optical axis,

The aspherical lens is a lens in which the object side and the sensor side are aspherical at the optical axis,

An optical system wherein at least one of the plurality of aspherical lenses is made of a material different from the spherical lens.
The optical system of claim 1, wherein the number of spherical lenses is twice or more than the number of aspherical lenses.
The optical system of claim 1, wherein at least one of the plurality of aspherical lenses is made of the same glass material as the spherical lens, and at least another one is made of plastic.
The method of claim 1, wherein the first to sixth lenses are made of glass,

The seventh lens is an optical system made of plastic.
The method of claim 4, wherein the second to sixth lenses are spherical lenses,

The first and seventh lenses are aspherical lenses,

An optical system in which the effective diameter of the first lens is larger than the effective diameter of each of the fourth to seventh lenses.
According to any one of claims 1 to 4,

It includes an aperture disposed around the circumference between the second lens and the third lens,

The first lens is an optical system having a concave shape on both sides of the optical axis.
According to any one of claims 1 to 4,

An optical system in which the sensor-side surface of the fourth lens and the object-side surface of the fifth lens are joined.
According to any one of claims 1 to 5,

The center spacing between the ith lens and the i+1 lens is CGi,

The central thickness of the ith lens is CTi,

The value of CTi/CGi is minimum when i is 1,

An optical system in which the value of CTi/CGi is maximum when i is 3.
According to any one of claims 1 to 5,

The center spacing between the first and second lenses is greater than the sum of the center thicknesses of two adjacent lenses among the first to seventh lenses,

The Abbe number of the first to fourth lenses is 50 or more,

Among the first to seventh lenses, the lens having the maximum refractive index is the fifth lens.
a first lens group having lenses of a first material aligned along an optical axis from the object side toward the sensor side;

a second lens group disposed on a sensor side of the lenses of the first material and having lenses of a second material aligned along the optical axis;

The number of lenses of the first material is more than twice the number of lenses of the second material,

In the first lens group, the first lens closest to the object has a convex object-side surface and a concave sensor-side surface,

The first lens has positive refractive power,

The last lens closest to the image sensor in the second lens group has a convex object side and a concave sensor side,

The last lens has negative refractive power,

An optical system in which the first material and the second material are different materials.
According to claim 10,

The first material is glass,

The second material is a plastic material,

The object-side surface and the sensor-side surface of the first lens have an aspherical surface,

An optical system wherein each of the lenses of the second material has an object-side surface and a sensor-side surface as an aspheric surface.
According to claim 10,

The refractive index of the first lens is greater than 1.75,

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,

The optical axis distance from the center of the object side of the last lens to the image surface of the image sensor is BFL,

Equation: Optical system that satisfies 4 < TTL / BFL < 10.
The method according to any one of claims 10 to 12,

The optical axis distance from the center of the object side of the last lens to the image surface of the image sensor is BFL,

1/2 of the diagonal length of the image sensor is Imgh,

Equation: An optical system that satisfies 1 < BFL / ImgH < 1.5.
The method according to any one of claims 10 to 12,

The effective focal length of the optical system is F,

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,

The optical axis distance from the center of the object side of the last lens to the image surface of the image sensor is BFL,

Equation 1: 2 ≤ TTL / F ≤ 3

Equation 2: 1 < F / BFL < 3

An optical system that satisfies .
The method according to any one of claims 10 to 12,

The first lens group includes first to fifth lenses,

The second lens group includes sixth to seventh lenses,

The seventh lens is the last lens,

An optical system in which the focal length of the first lens is greater than the composite focal length of the second to seventh lenses.
According to claim 15,

The central thickness of the second lens is the largest among the central thicknesses of the first to seventh lenses,

The optical system wherein the center spacing between the first lens and the second lens is the largest among the center spacings between adjacent lenses and is greater than the center thickness of the second lens.
image sensor;

first to seventh lenses aligned along the optical axis from the object side toward the sensor side;

An aperture disposed between spherical lenses among the first to seventh lenses: and

Includes an optical filter between the seventh lens and the image sensor,

The first lens and the seventh lens are made of the same material and are different from the materials of the lens disposed on the object side of the aperture and the lens disposed on the sensor side of the aperture,

The refractive power of the seventh lens is negative,

Among the first to seventh lenses, it is disposed between the aperture and the image sensor and includes a bonded lens in which two different lenses are bonded,

A camera module wherein at least one of the lenses between the bonded lens and the image sensor is an aspherical lens.