Optical system and imaging device module

Abstract

An optical system disclosed in an embodiment of the present invention may include first to seventh lenses aligned along an optical axis from an object side toward a sensor side. The first lens may have a negative refractive power. The combined refractive power of the third to seventh lenses may be positive. The first lens has a meniscus shape protruding from the optical axis toward the sensor side. A center thickness of the first lens may be greater than a center thickness of each of the second to seventh lenses. The first to seventh lenses may include a plurality of spherical lenses and a plurality of aspheric lenses. Each of the spherical lenses may have a spherical object-side surface and a spherical sensor-side surface. Each of the aspherical lenses may have an aspherical object-side surface and a sensor-side surface. At least one of the plurality of aspheric lenses may be made of a different material than the spherical lens.

Description

Technical Field

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

[0002] ADAS (Advanced Driver Assistance System) is an advanced driver assistance system for assisting the driver in driving, and includes sensing the situation ahead, determining the situation based on the sensing result, and determining the behavior of controlling the vehicle based on the situation. For example, an ADAS sensor device detects the vehicle ahead and identifies the lane. Then, when the forward target and the target lane or the target speed are determined, the vehicle's ESC (Electrical Stability Control), EMS (Engine Management System), MDPS (Motor Driven Power Steering), etc. are controlled. Typically, ADAS can be implemented as an automatic parking system, a low-speed city driving assistance system, a blind spot warning system, etc.

[0003] The sensor devices used to sense the situation ahead in ADAS are GPS sensors, laser scanners, front radars and laser radars, and the most representative are cameras for photographing the front, rear and sides of the vehicle. These cameras can be placed outside or inside the vehicle to detect the surrounding environment of the vehicle. In addition, the camera can be placed inside the vehicle to detect the situation of the driver and passengers. For example, the camera can photograph the driver at a position adjacent to the driver, and detect the driver's health, whether he or she is drowsy, whether he or she is drinking, etc. In addition, the camera can photograph the passenger at a position adjacent to the passenger, and detect the passenger's sleeping condition, health condition, etc. and provide information about the passenger to the driver.

[0004] In particular, the most important element for obtaining an image from a camera is an imaging lens that forms the image. Recently, interest in high definition and high resolution, etc. has been increasing, and to achieve this, research on an optical system including a plurality of lenses is being conducted. However, there is a problem that when the camera is exposed to a harsh environment such as high temperature, low temperature, moisture or high humidity outside or inside a vehicle, the characteristics of the optical system change. In this case, the camera has a problem that it is difficult to uniformly obtain excellent optical characteristics and aberration characteristics. Therefore, a new optical system and camera that can solve the above-mentioned problems are needed. Summary of the invention

[0005] Technical issues

[0006] Embodiments may provide an optical system and a camera module in which a glass lens and a plastic lens are mixed. Embodiments may provide an optical system and a camera module in which a spherical lens and an aspherical lens are mixed. Embodiments may provide an optical system and a camera module with improved optical characteristics. Embodiments may provide an optical system and a camera module with excellent optical performance in a low temperature environment to a high temperature environment. Embodiments may provide an optical system and a camera module capable of preventing or minimizing changes in optical characteristics within various temperature ranges.

[0007] Technical Solution

[0008] An optical system according to an embodiment of the present invention includes: a first lens to a seventh lens aligned along an optical axis from an object side toward a sensor side, wherein a refractive power of the first lens is negative, a composite refractive power of the third lens to the seventh lens is positive, the first lens has a meniscus shape convex toward the sensor side on the optical axis, a center thickness of the first lens is greater than a center thickness of each of the second lens to the seventh lens, the first lens to the seventh lens 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, and the aspherical lens is a lens whose object side surface and sensor side surface are aspherical, and at least one of the plurality of aspherical lenses may be made of a material different from that of the spherical lens.

[0009] According to an embodiment of the present invention, the number of spherical lenses can be at least twice the number of aspherical lenses. At least one of the multiple aspherical lenses can be made of the same glass material as the spherical lenses, and at least one of the multiple aspherical lenses can be made of plastic material.

[0010] According to an embodiment of the present invention, the first to sixth lenses may be made of glass, and the seventh lens may be made of plastic. The first to fifth lenses may be spherical lenses, and the sixth and seventh lenses may be aspherical lenses. The effective diameter of the first lens may be greater than the effective diameters of the fourth to seventh lenses. An aperture stop may be arranged at the periphery between the second lens and the third lens. The sensor side surface of the fourth lens and the object side surface of the fifth lens may be bonded.

[0011] According to an embodiment of the present invention, the center distance between the i-th lens and the (i+1)-th lens is CGi, the center thickness of the i-th lens is CTi, and when i is 6, the value of CTi / CGi may be minimum, and when i is 1, the value of CTi / CGi may be maximum. The center thickness of the first lens may be greater than the sum of the center thicknesses of two adjacent lenses from the second lens to the seventh lens.

[0012] An optical system according to an embodiment of the present invention includes: an image sensor; a first lens to a seventh lens aligned along an optical axis from an object side toward a sensor side, wherein the first lens has a negative refractive power, an object side surface of the first lens is concave on the optical axis, and a composite refractive power of the second lens to the seventh lens has a positive refractive power, at least one of the sixth lens and the seventh lens is a plastic lens, a lens closest to the plastic lens is made of glass, and the glass lens closest to the plastic lens can be a lens having the largest effective diameter difference between an object side surface and a sensor side surface of each of the first lens to the seventh lens.

[0013] According to an embodiment of the present invention, the lens having the largest effective diameter difference between the object side surface and the sensor side surface may be the fifth lens. The sensor side surface of the first lens may be convex on the optical axis. Among the object side surface and the sensor side surface of each of the first to seventh lenses, the surface having the smallest absolute value of the radius of curvature on the optical axis may be the sensor side surface of the fifth lens.

[0014] According to an embodiment of the present invention, among the object side surface and the sensor side surface of each of the first to seventh lenses, the object side surface of the seventh lens may have the largest absolute value of the radius of curvature. The sixth and seventh lenses are made of plastic material, and the average value of the radius of curvature of the object side surface and the sensor side surface of the sixth lens may be greater than the absolute value of the average radius of curvature of the object side surface and the sensor side surface of each of the first to fifth lenses. The sixth and seventh lenses are made of plastic material, and the average value of the radius of curvature of the object side surface and the sensor side surface of each of the sixth and seventh lenses may be greater than the absolute value of the average radius of curvature of the object side surface and the sensor side surface of each of the first to fifth lenses.

[0015] A camera device module according to an embodiment of the present invention includes: an image sensor; a first lens to a seventh lens aligned along an optical axis from an object side toward a sensor side; an aperture stop, which is arranged between spherical lenses among the first lens to the seventh lens; and a filter between the seventh lens and the image sensor, wherein the first lens has a meniscus shape convex toward the sensor on the optical axis, the refractive power of the first lens and the seventh lens is negative, the composite refractive power of the third lens to the seventh lens is positive, the first lens to the seventh lens have at least one aspherical lens, the first lens to the seventh lens include a cemented lens, in the first lens to the seventh lens, the cemented lens is arranged between the aperture stop and the image sensor, in the cemented lens, two different lenses are cemented, and the aspherical lens can be arranged between the cemented lens and the image sensor.

[0016] Effects of the Invention

[0017] The optical system and the camera module according to the embodiment may have improved optical characteristics. In detail, in the optical system according to the embodiment, the plurality of lenses may have set thickness, refractive power, and spacing between adjacent lenses. Therefore, the optical system and the camera module according to the embodiment may have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set field of view, and may have good optical performance in the periphery of the field of view.

[0018] In addition, the optical system and the camera module according to the embodiment can 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, the multiple lenses included in the optical system can have set materials, refractive power, and refractive index. Therefore, even when the focal length of each lens changes due to changes in refractive index according to temperature changes, the lenses can compensate for each other. That is, the optical system can effectively perform refractive power distribution in a temperature range from low temperature to high temperature, and can prevent or minimize changes in optical properties in a temperature range from low temperature to high temperature. Therefore, the optical system and the camera module according to the embodiment can maintain improved optical properties in various temperature ranges.

[0019] In addition, the optical system and the camera module according to the embodiment can meet the set field of view and achieve excellent optical characteristics by mixing aspherical lenses and spherical lenses. This enables the optical system to provide a thinner vehicle camera module. Therefore, the optical system and the camera module can be provided for various applications and devices, and even in a harsh temperature environment such as when exposed to the outside of the vehicle or inside the vehicle at high temperatures in summer, the optical system and the camera module can have excellent optical characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a side cross-sectional view of an optical system according to a first embodiment and an image pickup device module having the optical system.

[0021] Figure 2 It is used to explain the Figure 1 A side cross-sectional view showing the relationship between the nth lens and the n-1th lens.

[0022] Figure 3 It is shown Figure 1 A table of lens characteristics of an optical system.

[0023] Figure 4 It is shown Figure 1 Table of aspheric coefficients of lenses in the optical system.

[0024] Figure 5 It is shown Figure 1 A table of the thickness of each lens in an optical system and the distances between adjacent lenses.

[0025] Figure 6 It shows that according to Figure 1 A table of CRA (chief ray angle) data at room temperature, low temperature, and high temperature for the position of the image sensor in the optical system.

[0026] Figure 7 Is to show about Figure 1 A graph of the diffraction MTF (Modulation Transfer Function) data of an optical system at room temperature.

[0027] Figure 8 Is to show about Figure 1 A graph of the diffraction MTF data of an optical system at low temperatures.

[0028] Fig. 9 Is to show about Figure 1 A graph of the diffraction MTF data of an optical system at high temperature.

[0029] Fig.10 Is to show about Figure 1 A graph of data of aberration characteristics of an optical system at room temperature.

[0030] Fig.11 Is to show about Figure 1 A graph showing the aberration characteristics of an optical system at low temperatures.

[0031] Fig.12 Is to show about Figure 1 A graph showing data on aberration characteristics of an optical system at high temperatures.

[0032] Fig.13 is a side cross-sectional view of an optical system according to a second embodiment and an image pickup device module having the optical system.

[0033] Fig.14 It is shown Fig.13 A table of lens characteristics of an optical system.

[0034] Fig.15 It is shown Fig.13 Table of aspheric coefficients of lenses in the optical system.

[0035] Fig.16 It is shown Fig.13 A table of the thickness of each lens of an optical system and the spacing between adjacent lenses.

[0036] Fig.17 It shows that according to Fig.13Table of CRA data at room temperature, low temperature, and high temperature for the position of the image sensor in the optical system.

[0037] Fig.18 Is to show about Fig.13 A graph of the diffraction MTF data of an optical system at room temperature.

[0038] Fig.19 Is to show about Fig.13 A graph of data of aberration characteristics of an optical system at room temperature.

[0039] Fig. 20 is a graph showing relative illumination according to the height of an image sensor according to an embodiment.

[0040] Fig.21 is a side cross-sectional view of an optical system according to a third embodiment and an image pickup device module having the optical system.

[0041] Fig. 22 It is used to explain the Fig.21 A side cross-sectional view showing the relationship between the nth lens and the n-1th lens.

[0042] Fig.23 It is shown Fig.21 A table of lens characteristics of an optical system.

[0043] Fig.24 It is shown Fig.21 Table of aspheric coefficients of lenses in the optical system.

[0044] Fig.25 It is shown Fig.21 A table of the thickness of each lens of an optical system and the spacing between adjacent lenses.

[0045] Fig.26 It shows that according to Fig.21 Table of CRA data at room temperature, low temperature, and high temperature for the position of the image sensor in the optical system.

[0046] Fig. 27 Is to show about Fig.21 A graph of the diffraction MTF data of an optical system at room temperature.

[0047] Fig.28 Is to show about Fig.21 A graph of the diffraction MTF data of an optical system at low temperatures.

[0048] Fig.29 Is to show about Fig.21 A graph of the diffraction MTF data of an optical system at high temperature.

[0049] Fig.30 Is to show about Fig.21 A graph of data of aberration characteristics of an optical system at room temperature.

[0050] Fig.31 Is to show about Fig.21 A graph showing the aberration characteristics of an optical system at low temperatures.

[0051] Fig.32 Is to show about Fig.21 A graph showing data on aberration characteristics of an optical system at high temperatures.

[0052] Fig.33 is a graph showing relative illuminance according to the height of the image sensor according to the third embodiment.

[0053] Fig.34 is an example of a vehicle having an optical system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The technical spirit of the present invention is not limited to some embodiments to be described, but can be implemented in various other forms, and within the scope of the technical spirit of the present invention, one or more of the components can be selectively combined and replaced for use. In addition, unless explicitly defined and clearly described, the terms (including technical terms and scientific terms) used in the embodiments of the present invention can be interpreted according to the meanings generally understood by ordinary technicians in the field to which the present invention belongs, and common terms such as terms defined in dictionaries should be able to interpret their meanings in consideration of the contextual meanings of the relevant technology.

[0055] The terms used in the embodiments of the present invention are used to illustrate the embodiments, and are not intended to limit the present invention. In this specification, unless otherwise specifically stated in the phrase, the singular form may also include the plural form, and in the case of stating A and (with) at least one (or one or more) of B, C, may include one or more of all combinations that can be combined with A, B and C. When describing the components of the embodiments of the present invention, terms such as the first, second, A, B, (a) and (b) may be used. Such terms are only used to distinguish components from other components, and may not be determined by the terms according to the properties, sequence or program of the corresponding constituent elements. And when describing a component "connected", "coupled" or "combined" to another component, the description may include not only direct "connection", "coupling" or "combination" to another component, but also "connection", "coupling" or "combination" by another component between the component and another component. In addition, in the case of being described as "above (upper)" or "below (lower)" formed or arranged on each component, the description includes not only the situation when the two components are in direct contact with each other, but also the situation when one or more other components are formed or arranged between the two components. In addition, when expressed as "above (up)" or "below (below)", it can refer to the upward direction and the downward direction with respect to an element. Several embodiments described below can be combined with each other, unless it is specifically stated that they cannot be combined with each other. In addition, unless otherwise specified, the description of other embodiments can be applied to the parts omitted from the description of any one of the several embodiments.

[0056] In the description of the present invention, "object side surface" may refer to the surface of the lens facing the object side relative to the optical axis OA, and "sensor side surface" may refer to the surface of the lens facing the imaging surface (image sensor) relative to the optical axis. The convex surface of the lens may mean a convex shape on the optical axis or the paraxial region, and the concave surface of the lens may mean a concave shape on the optical axis or the paraxial region. The radius of curvature, the center thickness, and the distance between the lenses described in the table of lens data may mean the value on the optical axis, and the unit is mm. The vertical direction may mean the direction perpendicular to the optical axis, and the end of the lens or the lens surface may mean the end or edge of the effective area of ​​the lens through which the incident light passes. Depending on the measurement method, the size of the effective diameter on the lens surface may have a measurement error of up to ±0.4mm. The paraxial region refers to a very narrow area near the optical axis, and is an area where the distance of the light falling from the optical axis OA is almost 0. In the following, the optical axis may include the center of each lens or a very narrow area near the optical axis.

[0057] Figure 1 is a configuration diagram of an optical system and an imaging device module according to a first embodiment, and Fig.13is a configuration diagram of an optical system and an imaging device module according to a second embodiment. As Figure 1 and Fig.13 shown, the optical system 1000 according to the first and second embodiments of the present invention may include a plurality of lens groups LG1 and LG2. The plurality of lens groups LG1 and LG2 may include a first lens group LG1 and a second lens group LG2 arranged in sequence from the object side toward the image sensor 300 along the optical axis OA. The optical system 1000 may include n lenses, where the nth lens may be the last lens, and the (n - 1)th lens may be the lens closest to the last lens. n is an integer greater than or equal to 5, 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 from each other. The number of lenses in the second lens group LG2 may be greater than the number of lenses in the first lens group LG1, for example, may be more than twice or three times or more the number of lenses in the first lens group LG1.

[0058] The first lens group LG1 may have three or fewer lenses. The first lens group LG1 may preferably have one or two lenses. The second lens group LG2 may include three or more lenses. The second lens group LG2 may have four or more or five or more lenses. If the first lens group LG1 is two lenses adjacent to the object side and the second lens group LG2 is the remaining lenses, the combined focal length of the first lens group LG1 may be defined as F_LG1, and the combined focal length of the second lens group LG2 may be defined as F_LG2, and the following condition may be satisfied: F_LG2 < F_LG1. In contrast, if the first lens group LG1 is one lens adjacent to the object side and the second lens group LG2 is the remaining lenses, the focal length of the first lens group LG1 may be defined as F_LG1, and the combined focal length of the second lens group LG2 may be defined as F_LG2, and the following condition may be satisfied: F_LG2 < │F_LG1│.

[0059] The first lens group LG1 may include at least one lens made of glass. The second lens group LG2 may include at least one glass lens and at least one plastic lens. The second lens group LG2 may include three or more glass lenses and at least one plastic lens, for example, four or more glass lenses and two or fewer plastic lenses. The glass lens has a small amount of expansion and contraction changes due to external temperature changes, and the surface is not easily scratched, so it can prevent surface damage. In addition, the plastic lens is effective in improving thin thickness and optical characteristics. Among the lenses of the second lens group LG2, one or two lenses closest to the image sensor 300 may be provided as plastic lenses or aspherical lenses.

[0060] At least one lens closest to the object in the optical system 1000 may be made of glass. In the first and second embodiments, the lens of the first lens group LG1 may be a spherical lens, and the lens of the second lens group LG2 may include at least one aspherical lens and two or more spherical lenses. The aspherical lens is a lens whose object side surface and sensor side surface are aspherical, and the spherical lens is a lens whose object side surface and sensing side surface are spherical. In the second lens group LG2, the number of spherical lenses may be greater than the number of aspherical lenses. The aspherical lens can prevent spherical aberration in the optical system 1000, and since aberration does not occur even when the effective diameter increases, miniaturization and weight reduction of the camera module can be achieved. The aspherical lens may be made of a glass molded material or a plastic molded material. In addition, the glass molded material may be set as an aspherical lens. Since the rate of change of contraction and expansion caused by the temperature change of the glass material lens is less than the rate of change of contraction and expansion of the plastic material, the glass lens may be arranged on the object side, and the plastic lens may be arranged adjacent to the image sensor 300. Furthermore, since at least two aspherical lenses are arranged adjacent to the image sensor 300 , various aberrations may be compensated.

[0061] Among the lenses of the optical system 1000, a lens having a maximum Abbe number may be located in the second lens group LG2, and a lens having a maximum refractive index may be located in the second lens group LG2. The maximum Abbe number is 65 or greater, and the maximum refractive index may be greater than 1.7. The lens having the maximum Abbe number may reduce dispersion, while the lens having the maximum refractive index may increase the dispersion of incident light. In addition, the lens having the maximum refractive index may be located closer to the object side than the lens having the maximum Abbe number. The lens having the maximum effective diameter in the optical system 1000 may be a lens close to the object side, or one of the lenses between two object side lenses and between two sensor side lenses. Preferably, the lens having the maximum effective diameter is a glass lens, and may be arranged closer to the object side than the lens having the maximum refractive index. The effective diameter of each lens may be the diameter of the effective area where effective light is incident on 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 present invention can reduce the weight of a camera module, provide lower manufacturing costs, and suppress degradation of optical characteristics due to temperature changes by mixing a spherical lens and an aspherical lens in the optical system 1000 .

[0062] Each lens in the lens may include an effective area and an ineffective area. The effective area may be an area through which light incident on each lens in the lens passes. In other words, the effective area may be defined as an effective area or effective diameter where the incident light is refracted to achieve optical properties. The ineffective area may be arranged around the effective area. The ineffective area may be an area where effective light is not incident from multiple lenses. In other words, the ineffective area may be an area that is unrelated to optical properties. In addition, the end of the ineffective area may be an area fixed to a lens barrel (not shown) that houses the lens.

[0063] In the optical system 1000, the TTL (total top length) may be more than 2 times, for example, more than 2 times and less than 15 times, of ImgH. Preferably, the following condition may be satisfied: 4<TTL / ImgH≤10. TTL (total track length) is the distance from the center of the object side surface of the first lens to the surface of the image sensor 300 on the optical axis OA. ImgH is 1 / 2 of the maximum diagonal length of the image sensor 300. In the optical system 1000, the effective focal length (EFL) is set to 10 mm or more, and the diagonal field of view (FOV) is set to less than 45 degrees, so that the optical system can be set in a vehicle camera module as a standard optical system. For example, the optical system and the camera module according to the embodiment may be applied to a camera module for an ADAS (advanced driver assistance system) installed inside or outside a vehicle.

[0064] The optical system 1000 may have a condition that TTL / (2*ImgH) is 2.5 or more or 2.7 or more (for example, in the range of 2.5 to 5 or 3 to 5). By setting the value of TTL / (2*ImgH) in the optical system 1000 to 2.5 or more, a vehicle lens optical system may be provided. The total number of lenses of the first lens group LG1 and the second lens group LG2 is 9 or less or 8 or less. Therefore, the optical system 1000 may provide an image that is not exaggerated or distorted with respect to the formed image.

[0065] The number of lenses in optical system 1000 having an effective diameter greater than the length of image sensor 300 may exceed 50%, and the number of lenses having an effective diameter less than the length of image sensor 300 may be 40% or less. At least one or all of the aspherical lenses in optical system 1000 may have an effective diameter less than the length of image sensor 300.

[0066] The effective diameter of the lens closest to the object side in the lens section 100 may be larger than the effective diameter of the lens closest to the image sensor 300. In addition, the effective diameter of the lens arranged on the object side of the aperture stop ST and the effective diameter of the lens arranged on the sensor side may be larger than the diagonal length of the image sensor 300. Therefore, the brightness of the optical system can be controlled. By controlling the effective diameter of each of the lenses, the optical system 1000 can control incident light to compensate for degradation of optical characteristics due to resolution and temperature changes, improve chromatic aberration control characteristics, and improve vignetting characteristics of the optical system 1000.

[0067] At least one cemented lens 145 may be included in the optical system 1000. The cemented lens 145 may be a lens in which two lenses having different focal lengths are bonded together. The cemented lens 145 has an object side lens and a sensor side lens, and the effective diameter of the object side lens may be greater than the effective diameter of the sensor side lens. In addition, the effective diameter of the object side lens of the cemented lens 145 may be greater than the length of the image sensor 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. The cemented lens 145 may be a spherical lens. The effective diameter of a lens arranged closer to the object relative to the cemented lens 145 may be greater than the length of the image sensor 300. At least one of the lenses arranged closer to the sensor based on the cemented lens 145 may have an effective diameter less than the length of the image sensor 300. The cemented lens 145 may be arranged between a spherical lens and an aspherical lens in the optical system.

[0068] The first lens group LG1 and the second lens group LG2 may have a set interval on the optical axis OA. The optical axis distance between the first lens group LG1 and the second lens group LG2 on the optical axis OA may be the optical axis distance between the sensor side surface of the lens closest to the sensor side among the lenses in the first lens group LG1 and the object side surface of the lens closest to the object side among the lenses in the second lens group LG2.

[0069] The optical axis distance between the first lens group LG1 and the second lens group LG2 may be 0.5 times or less of the optical axis distance of the first lens group LG1, for example, may be in the range of 0.01 times to 0.5 times of the optical axis distance of the first lens group LG1. The optical axis distance between the first lens group LG1 and the second lens group LG2 may be 0.3 times or less of the optical axis distance of the second lens group LG2, for example, may be in the range of 0.01 times to 0.3 times of the optical axis distance of the second lens group LG2. The optical axis distance of the second lens group LG2 is the optical axis distance between the object side surface of the lens closest to the object side of the second lens group LG2 and the sensor side surface of the lens closest to the image sensor 300. Here, in the lens surfaces of the first lens group LG1 and the second lens group LG2, the two surfaces facing each other may have the following shapes: the sensor side surface of the object side lens is concave on the optical axis, and the object side surface of the sensor side lens is convex on the optical axis. Differently, the two surfaces facing each other may have the following shapes: the sensor side surface of the object side lens is convex on the optical axis, and the object side surface of the sensor side lens is concave on the optical axis. The first lens group LG1 refracts light incident through the object side for collection, and the second lens group LG2 refracts light emitted to the image sensor 300 through the first lens group LG1.

[0070] The first lens group LG1 may have a positive (+) refractive power, and the second lens group LG2 may have a positive (+) refractive power. In the first lens group LG1, the lens closest to the object side may have a negative (-) refractive power, and among the lenses of the second lens group LG2, the lens closest to the sensor side may have a negative (-) refractive power. In addition, the refractive power of the first lenses 101 and 111 on the object side may be positive (+), and the composite focal length of the second lens to the seventh lens may have a positive (+) value.

[0071] When the focal length is expressed in absolute value, the focal length of the first lens group LG1 may be 1.5 times or more, for example, 1.5 times to 5 times, the focal length of the second lens group LG2. The EFL of the optical system 1000 may be smaller than the absolute value of the focal length of the first lens group LG1. The EFL of the optical system 1000 may be smaller than the absolute value of the focal length of the second lens group LG2.

[0072] The lens parts 100 and 100A may be a mixture of spherical lenses and aspherical lenses. The number of aspherical lenses may be less than 50% of the total number of lenses, and may be in the range of 10% to 40%. When the absolute value of the focal length is expressed, the average value of the focal length of the spherical lens may be less than the average value of the focal length of the aspherical lens. The average value of the refractive index of the aspherical lens may be less than the average value of the refractive index of the spherical lens. In addition, the average value of the effective diameter of the spherical lens may be greater than the average value of the effective diameter of the aspherical lens. Therefore, when two or more aspherical lenses are arranged in the camera module, the weight of the camera module may be reduced and the optical characteristics may be improved. The first lenses 101 and 111 closest to the object have a lower Abbe number and a higher refractive index than the second lenses 102 and 112, so that the dispersion may be improved. In addition, since 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, the dispersion at the position adjacent to the image sensor 300 may be improved.

[0073] The number of lenses with negative (-) refractive power may be less than the number of lenses with positive (+) refractive power on the optical system 1000. The number of lenses with negative (-) refractive power may be less than 50% of the total number of lenses, for example, in the range of 20% to 45%.

[0074] The sum of the refractive indexes of the lenses of the lens portions 100 and 100A of the present embodiment may be 8 or more, for example, in the range of 8 to 15, and the average value of the refractive indexes may be in the range of 1.60 to 1.70. The sum of the Abbe numbers of each of the lenses may be 250 or more, for example, in the range of 250 to 370, and the average value of the Abbe numbers may be 55 or less, for example, in the range of 31 to 55. The sum of the center thicknesses of the entire lens may be 15 mm or more, for example, in the range of 15 mm to 35 mm or in the range of 20 mm to 30 mm. The average value of the center thicknesses of the entire lens may be 5 mm or less, for example, in the range of 2.8 mm to 5 mm. The sum of the center spacings between the lenses on the optical axis OA may be 4 mm or more, for example, in the range of 4 mm to 8 mm, and may be less than the sum of the center thicknesses of the lenses. In addition, the average value of the effective diameter of each lens surface of the lens portions 100 and 100A may be set to 8 mm or more, for example, in the range of 8 mm to 15 mm.

[0075] The F number of the optical system or camera module according to an embodiment of the present invention may be 2.4 or less, for example, in the range of 1.4 to 2.4 or in the range of 1.5 to 1.8. The maximum field of view (diagonal FOV) of the optical system according to an embodiment of the present invention may be 50 degrees or less, for example, in the range of 20 degrees to 55 degrees or 25 degrees to 40 degrees. The vehicle optical system may have a horizontal field of view (FOV_H) greater than 20 degrees and less than 40 degrees (for example, in the range of 25 degrees to 35 degrees) in the Y-axis direction. In addition, the vertical field of view is set at an angle less than the horizontal field of view, and may be 20 degrees or less, for example, in the range of 10 degrees to 20 degrees. At this time, the sensor length in the horizontal direction Y may be 8.064mm±0.5mm, and the sensor height in the vertical direction X may be 4.54mm±0.5mm. The horizontal field of view FOV_H is a field of view based on the horizontal length of the sensor. Therefore, changes in the focus position due to temperature changes can be suppressed, and a vehicle camera device that corrects various aberrations well is provided.

[0076] The optical system 1000 or the camera module may include an image sensor 300. The image sensor 300 may detect light and convert it into an electrical signal. The image sensor 300 may detect light that passes through the lens parts 100 and 100A in sequence. The image sensor 300 may include a device capable of detecting incident light, such as a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor). Here, the number of lenses having an effective diameter greater than the length of the image sensor 300 may be 5 to 6, and the number of lenses having an effective diameter less than the length of the image sensor 300 may be 1 or 2.

[0077] The optical system 1000 or the camera module may include a filter 500. The filter 500 may be disposed between the second lens group LG2 and the image sensor 300. The filter 500 may be disposed between the lens closest to the sensor side among the lenses of the lens parts 100 and 100A and the image sensor 300. For example, the optical systems 100 and 100A may be disposed between the last lens and the image sensor 300. The cover glass 400 is disposed between the filter 500 and the image sensor 300, and protects the upper portion of the image sensor 300 and prevents the reliability of the image sensor 300 from being deteriorated. The cover glass 400 may be removed.

[0078] The filter 500 may include an infrared filter or an infrared cut filter (IR cut). The filter 500 may allow light of a set wavelength band to pass through and filter light of a different wavelength band. When the filter 500 includes an infrared filter, it may prevent radiant heat emitted from external light from being transmitted to the image sensor 300. In addition, the filter 500 may transmit visible light and reflect infrared light.

[0079] The optical system 1000 according to the embodiment may include an aperture stop ST. The aperture stop ST may adjust the amount of light incident on the optical system 1000. The aperture stop ST may be provided between any two lenses in the lens sections 100 and 100A. For lenses provided between the object and the aperture stop ST, the effective diameters of the lenses tend to become smaller as they move from the object side to the aperture stop ST. For lenses provided between the aperture stop ST and the image sensor 300, the effective diameters of the lenses tend to become smaller as they move from the aperture stop ST to the sensor side. The meaning of "the effective diameters of the lenses tend to decrease as they move from the aperture stop ST to the sensor side" means not only the case where the effective diameters of the lenses provided between the aperture stop ST and the image sensor 300 decrease as they move from the aperture stop ST to the sensor side, but also the case where at least one lens surface may be larger than the lens surface on the object side. In the case of lenses provided between the aperture stop ST and the image sensor as in the embodiment of the present invention, the effective diameters of the lenses may increase and then decrease as they move from the aperture stop ST to the sensor side.

[0080] The first lenses 101 and 111 and the second lenses 102 and 112 may be disposed on the object side of the aperture stop ST, and the third lenses 103 and 113 and the fourth lenses 104 and 114 may be disposed on the sensor side of the aperture stop ST. When the aperture stop ST is disposed on the sensor side surface of the second lenses 102 and 112, the following conditions are satisfied: effective diameter of the object side surface of the first lens > effective diameter of the sensor side surface of the first lens > effective diameter of the object side surface of the second lens > effective diameter of the sensor side surface of the second lens (effective diameter of the aperture stop). The following conditions are satisfied: effective diameter of the sensor side surface of the second lenses 102 and 112 (effective diameter of the aperture stop) > effective diameter of the object side surface of the third lens > effective diameter of the sensor side surface of the fourth lens. The aperture stop ST may be disposed at a set position. The aperture stop ST may be arranged around the object side surface or the sensor side surface of any one of the lenses of the first lens group LG1. For example, the aperture stop ST may be arranged 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 stop ST may be arranged around the object-side surface or the sensor-side surface of the lens closest to the object side among the lenses of the second lens group LG2. In this case, the aperture stop ST may be arranged around the object-side surface or the sensor-side surface of the object-side lens of the first lens group LG1. In this case, at least one lens selected from the plurality of lenses may function as the aperture stop. In detail, the object-side surface or the sensor-side surface of one lens selected from the lenses of the optical system 1000 may function as the aperture stop for controlling the amount of light.

[0081] Since the embodiment is an optical system applied to a vehicle camera device, an aspherical lens and a spherical lens can be used together, and the first lens closest to the object side can be provided with a glass material. This has the following advantages: compared with plastic materials, glass materials are scratch-resistant and insensitive to external temperature. In order to be placed inside the vehicle or to more effectively prevent scratches caused by foreign matter, the first lens can use a glass material, and the object side surface of the first lens can have a concave shape so as not to contact the external structure. When the object side surface of the first lens is designed to have a convex shape, scratches may occur due to contact with the external structure. For driver monitoring, front and rear imaging of the vehicle, lane detection, and detection of foreign matter around the vehicle, the field of view can be greater than 20 degrees and less than 40 degrees, for example, in the range of 25 degrees to 35 degrees. The horizontal field of view can be a preset angle for an advanced driver assistance system. The optical system 1000 according to the embodiment may also include a reflective member (not shown) for changing the light path. The reflective member can be implemented as a prism that reflects the incident light of the first lens group LG1 toward the lens. Hereinafter, the optical system according to the embodiment will be described in detail.

[0082] Will refer to Figures 1 to 12 An optical system and a camera module according to a first embodiment of the present invention are described. Figures 1 to 3 , the optical system 1000 according to the first embodiment includes a lens part 100, and the lens part 100 may include first to seventh lenses 101 to 107 sequentially arranged along the optical axis OA. Light corresponding to information about an object may pass through the first to seventh lenses 101 to 107 and the filter 500 to be incident on the image sensor 300. The first lens 101 is a lens closest to the object side in the first lens group LG1. The seventh lens 107 is a lens closest to the image sensor 107 in the second lens group LG2 or the lens part 100. The first lens 101 and the second lens 102 may be the first lens group LG1, and the third to seventh lenses 103, 104, 105, 106, and 107 may be the second lens group LG2.

[0083] The first lens 101 may have a positive (+) or negative (-) refractive power on the optical axis OA. The first lens 101 may have a negative (-) refractive power. The first lens 101 may include a plastic material or a glass material, and may be, for example, a glass material. The first lens 101 made of a glass material may reduce changes in the center position and the radius of curvature caused by temperature changes depending on the surrounding environment, and may protect the incident side surface of the optical system 1000. The object side first surface S1 of the first lens 101 based on the optical axis may be concave, and the sensor side second surface S2 may be convex. The first lens 101 may have a meniscus shape convex toward the sensor side. In contrast, the first surface S1 may have a convex shape on the optical axis OA, and the second surface S2 may have a concave shape. In contrast, the first lens 101 may have a shape concave on both sides on the optical axis OA. The first lens 101 may be set as a spherical lens made of glass. The effective radius of the first surface S1 of the first lens 101 may be greater than the effective radius of the object side surface and the sensor side surface of the second lens 102 to the seventh lens 107. Since the first surface S1 is concave and the second surface S2 has a convex shape, the incident light is refracted in a direction away from the optical axis OA, and the distance between the first lens 101 and the second lens 102 can be reduced. The first surface S1 of the first lens 101 can be arranged to have no critical point from the optical axis OA to the end (i.e., edge) of the effective area. The second surface S2 of the first lens 101 can be arranged to have no critical point.

[0084] The second lens 102 may be disposed between the first lens 101 and the third lens 103. The second lens 102 may have a positive (+) or negative (-) refractive power on the optical axis OA. The second lens 102 may have a positive (+) refractive power. The second lens 102 may include a plastic material or a glass material. For example, the second lens 102 may be made of glass. The third surface S3 of the object side of the second lens 102 on the optical axis OA may have a convex shape, and the fourth surface S4 on the sensor side may have a concave shape. The second lens 102 may have a meniscus shape convex toward the object side on the optical axis. Alternatively, the second lens 102 may have a convex shape on both sides. 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 set 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 configured to have no critical point from the optical axis OA to the end of the effective area.

[0085] The third lens 103 may have a positive (+) or negative (-) refractive power on the optical axis OA. The third lens 103 may have a positive (+) refractive power. The third lens 103 may include a plastic material or a glass material. For example, the third lens 103 may be made of glass. The fifth surface S5 on the object side of the third lens 103 on the optical axis may have a convex shape, and the sixth surface S6 on the sensor side may have a concave shape. The third lens 103 may have a meniscus shape convex toward the object side on the optical axis. Differently, the third lens 103 may have a meniscus shape convex toward the sensor side. Alternatively, the third lens 103 may have a concave shape on both sides on the optical axis. The third lens 103 may be set 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 set to have no critical point from the optical axis OA to the end of the effective area.

[0086] The aperture stop ST may be provided around the sensor-side surface of the second lens 102. Alternatively, the aperture stop ST may be arranged around the object-side or sensor-side surface of the first lens 101, or around the object-side surface of the second lens 102. Since the third lens 103 on the sensor side adjacent to the aperture stop ST has a positive refractive power (F3>0), the third lens 103 may refract incident light in the optical axis direction and suppress an increase in the effective diameter of the sensor-side lens or the rear-side lens of the third lens 103. Therefore, the weight yield of the optical system may be prevented from decreasing due to the third lens 103, and production efficiency may be improved. Here, the composite focal length of the third lens 103 to the seventh lens 107 arranged on the sensor side of the aperture stop ST may have a positive value, and the TTL within the field of view may be reduced.

[0087] The fourth lens 104 may have a positive (+) or negative (-) refractive power on the optical axis OA. The fourth lens 104 may have a positive (+) refractive power. The fourth lens 104 may include a plastic material or a glass material. For example, the fourth lens 104 may be set as a glass material. The seventh surface S7 of the fourth lens 104 on the object side on the optical axis may be convex, and the eighth surface S8 on the sensor side may have a concave shape. The fourth lens 104 may have a meniscus shape convex toward the object side. Alternatively, the fourth lens 104 may have a meniscus shape convex on both sides or convex toward the sensor side on the optical axis OA. Alternatively, on 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 convex toward the object side. The fourth lens 104 may be set 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 disposed without a critical point from the optical axis OA to the end of the effective area.

[0088] The fifth lens 105 may have a positive (+) or negative (-) refractive power on the optical axis OA. The fifth lens 105 may have a negative (-) refractive power. The fifth lens 105 may include a plastic material or a glass material. For example, the fifth lens 105 may be made of glass. 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 have a concave shape. The fifth lens 105 may have a meniscus shape that bulges toward the object side on the optical axis. Alternatively, the fifth lens 105 may have a meniscus shape that bulges toward the sensor side. Alternatively, the ninth surface may have a convex shape on both sides of the optical axis OA. Alternatively, the fifth lens 105 may have a concave shape on both sides of the optical axis. The ninth surface and the tenth surface S10 of the fifth lens 105 may be spherical. At least one or both of the ninth surface and the tenth surface S10 may be set to have no critical points from the optical axis OA to the end of the effective area.

[0089] The fourth lens 104 and the fifth lens 105 may be joined and may be defined as a cemented lens 145. The joint 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 surface as the ninth surface of the fifth lens 105. When the distance between the fourth lens 104 and the fifth lens 105 is G4, G4 may be less than 0.01 mm. From the optical axis OA to the end of the effective area, the distance G4 between the fourth lens 104 and the fifth lens 105 may be less than 0.01 mm. The fourth lens 104 and the fifth lens 105 may have opposite refractive powers. The combined refractive power of the fourth lens 104 and the fifth lens 105 may have a negative (-) refractive power. When the combined refractive power of the cemented lens 145 is F45, the combined refractive power of the first lens 101 and the second lens 102 is F12, and the combined refractive power of the third lens 103 to the seventh lens 107 is F37, the following condition may be satisfied in terms of absolute value: F27 < F45 < F12. In the first embodiment and the second embodiment, F27 may be 13.986 mm and 13.889 mm, and F45 may be -31.451 mm and -43.854 mm.

[0090] The product of the refractive power of the fourth lens 104 and the refractive power of the fifth lens 105 of the cemented 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 cemented lens 145 may be less than 0. Therefore, the aberration characteristics of the optical system can be improved. If the refractive power of the two lenses of the cemented lens 145 is the same, there is a limit to the improvement of the aberration. The composite refractive power of the cemented lens 145 has a 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 cemented lens 145 can have a positive refractive power. Therefore, the third lens 103, the cemented lens 145 and the sixth lens 106 can refract some of the incident light in the direction of the optical axis.

[0091] The effective diameter of the fourth lens 104 may be greater than the effective diameter of the fifth lens 105, and may be greater than the diagonal length of the image sensor 300. The effective diameter of the fourth lens 104 is the average of the effective diameter of the seventh surface S7 and the effective diameter of the eighth surface S8. The effective diameter of the fifth lens 105 may be smaller than the effective diameter of the fourth lens 104, and may have a length within the range of ±110% or ±105% of the diagonal length of the image sensor 300. Preferably, the effective diameter of the fifth lens 105 may be greater than the diagonal length of the image sensor 300, for example, may be 110% or less or 105% or less of the diagonal length of the image sensor 300.

[0092] The effective diameter of the eighth surface S8 of the fifth lens 105 may be greater than the diagonal length of the image sensor 300 , and the effective diameter of the tenth surface S10 may be less than the diagonal length of the image sensor 300 .

[0093] When the fifth lens 105 is a spherical lens and the sixth lens 106 is an aspherical lens, the difference between the effective diameter of the seventh surface S7 on the object side of the cemented lens 145 and the effective diameter of the tenth surface S10 on the sensor side can be set to be as large as possible within the lens portion 100. When the effective diameter of the ninth surface of the fifth lens 105 and the effective diameter of the tenth surface S10 on the sensor side are set to CA51 and CA52, the following condition is satisfied: CA51>CA52, and the difference between CA51 and CA52 can be the largest of the differences in effective diameters between the object side surface and the sensor side surface of each lens. In addition, 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 set to CA41 and CA42, the following condition can be satisfied: CA41>CA42. Therefore, by the fifth lens 105 having a relatively small effective diameter and a concave sensor side surface, an increase in the effective diameter of the aspherical lens can be prevented.

[0094] Since the cemented lens 145 is a composite of spherical glass lenses having different refractive indices and at least one lens located on the sensor side compared to the cemented lens 145 is arranged as an aspherical lens, spherical aberration can be compensated by the aspherical lens. In addition, since at least one or two or more of the lenses located on the sensor side compared to the cemented lens 145 are aspherical lenses and have a small effective diameter, light can be refracted to the entire area of ​​the image sensor 300 by the aspherical lens. When 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 Vd5, the following condition can be satisfied: Nd5*Vd5<Nd4*Vd4.

[0095] When the radius of curvature of the seventh surface S7 on the object side of the cemented lens 145 is L4R1 and the radius of curvature of the tenth surface S10 on the sensor side of the cemented lens 145 is L5R2, the following condition may be satisfied: |L4R1-L5R2|<10mm, and preferably, |L4R1-L-5R2|≤5mm may be satisfied. The shapes of the object side surface and the sensor side surface of the cemented lens 145 have a meniscus shape convex toward the object side, and by setting the difference between the radius of curvature of the object side surface and the radius of curvature of the sensor side surface to be small, the amount of incident light may be increased, and the emitted light may be guided to the effective area of ​​the sixth lens 106 having a small effective diameter.

[0096] The sixth lens 106 may have a positive (+) or negative (-) refractive power on the optical axis OA. The sixth lens 106 may have a positive (+) refractive power. The sixth lens 106 may include a plastic material or a glass material. For example, the sixth lens 106 may be set to a glass material or a glass molded material. On the optical axis OA, the object-side eleventh surface S11 of the sixth lens 106 may be convex, and the sensor-side twelfth surface S12 may be concave. The sixth lens 106 may have a meniscus shape convex toward the object on the optical axis OA. Alternatively, the sixth lens 106 may have a meniscus shape convex toward the sensor or a double convex shape. Alternatively, the sixth lens 106 may have a double concave shape. The eleventh surface S11 and the twelfth surface S12 may be aspherical surfaces, and the aspherical coefficients of the eleventh surface S11 and the twelfth surface S12 may be set to Figure 4L6S1 and L6S2. Since the sixth lens 106 is made of an aspherical glass material, the number of lenses in the optical system can be reduced. The eleventh surface S11 of the sixth lens 106 can be set to have no critical point from the optical axis OA to the end of the effective area. The twelfth surface S12 can be set to have no critical point from the optical axis OA to the end of the effective area. Alternatively, at least one of the object-side surface and the sensor-side surface of the sixth lens 106 can have at least one critical point from the optical axis to the end of the effective area.

[0097] Since the sensor-side and object-side surfaces of the sixth lens 106 are set to have no critical point, the effective diameter of the seventh lens 107 does not need to be increased. In addition, 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 is not large.

[0098] When the effective diameter of the eleventh surface S11 on the object side of the sixth lens 106 is CA61 and the effective diameter of the twelfth surface S12 on the sensor side of the sixth lens 106 is CA62, the following condition can be satisfied: CA62 < CA61. If the radius of curvature of the eleventh surface S11 on the object side of the sixth lens 106 is L6R1 and the radius of curvature of the twelfth surface S12 on the sensor side of the sixth lens 106 is L6R2, the following condition can be satisfied: CA61 * L6R1 < CA62 * L6R2. If the refractive index of the sixth lens 106 is Nd6 and the Abbe number is Vd6, and the refractive index of the first lens 101 is Nd1 and the Abbe number is Vd1, the following condition can be satisfied: Nd6 < Nd1, Nd1 * Vd1 < Nd6 * Vd6. This means that the center thickness of the sixth lens 106 is greater than the center thickness of the seventh lens 107 and the refractive index is reduced to suppress chromatic aberration.

[0099] The seventh lens 107 can have a positive (+) or negative (-) refractive power on the optical axis OA. The seventh lens 107 can have a negative (-) refractive power. The seventh lens 107 can be made of a plastic material or a glass material. For example, the seventh lens 107 can be a plastic material. The thirteenth surface S13 on the object side of the seventh lens 107 can have a convex shape on the optical axis, and the fourteenth surface S14 on the sensor side can have a concave shape. The seventh lens 107 can have a meniscus shape that bulges toward the object side on the optical axis. Alternatively, the thirteenth surface S13 can have a concave shape on the optical axis, and the fourteenth surface S14 can have a convex shape. Alternatively, the seventh lens 107 can have concave shapes on both sides. The seventh lens 107 is made of a plastic material and can have aspherical surfaces on both sides. The thirteenth surface S13 and the fourteenth surface S14 have aspherical surfaces, and the aspherical coefficient can be set to Figure 4L7S1 and L7S2. 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, deterioration of optical performance can be prevented, and the influence on aberration characteristics and resolution can be controlled. In addition, by arranging the aspherical lens as the lens closest to the image sensor 300, it is less sensitive to assembly tolerances compared to a spherical lens. In other words, being less sensitive to assembly tolerances means that even if it is assembled slightly differently from the design during assembly, the optical performance is not significantly affected.

[0100] In the sixth lens 106, if the Sag value of the object-side surface is Sag61 and the Sag value of the sensor-side surface is Sag62, the following condition can be satisfied: 0 < Sag61 - Sag62 < 0.7 mm. Therefore, the thickness difference between the center and the edge of the sixth lens 106 is not large, and the influence on optical characteristics can be suppressed. In the seventh lens 107, if the Sag value of the object-side surface is Sag71 and the Sag value of the sensor-side surface is Sag72, the following condition can be satisfied: 0 < |Sag71| - |Sag72| < 0.4 mm. Therefore, the thickness difference between the center and the edge of the seventh lens 107 is not large, and the radius of curvature is not large, and the influence on optical characteristics can be suppressed. Since the sixth lens 106 and the seventh lens 107 are arranged as aspherical lenses, deterioration of optical performance can be prevented, the number of lenses can be reduced, and the TTL of the optical system can be reduced.

[0101] Referring to Figure 2 , at least one or both of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 may have critical points. The thirteenth surface 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 thirteenth surface S13 and the fourteenth 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 thirteenth surface S13 may be located at a position 2.3 mm or less (for example, in the range of 1.7 mm to 2.4 mm) from the optical axis OA. As another example, the thirteenth surface S13 may be set without critical points.

[0102] The fourteenth 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 fourteenth surface S14 may be located at a position 2.5 mm or more (for example, in the range of 2.5 mm to 3.1 mm) from the optical axis OA. Since the critical point of the fourteenth surface S14 is closer to the edge than the critical point of the thirteenth surface S13 with respect to the optical axis, the fourteenth surface S14 can refract light to the periphery of the image sensor 300.

[0103] The BFL (back focal length) is the optical axis distance from the surface of the image sensor 300 to the center of the sensor-side surface of the last lens. A tangent line K1 passing through any point of the fourteenth surface S14 of the seventh lens 107 and a normal line K2 perpendicular to the tangent line K1 can have a predetermined angle θ1 with the optical axis OA. The maximum tangent angle θ1 of the fourteenth surface S14 in the first direction X can be 45 degrees or less, for example, within the range of 5 degrees to 45 degrees or within the range of 15 degrees to 35 degrees. 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 surface and the sensor-side surface at the end of the effective area of each lens. CG6 is the optical axis distance (i.e., the center distance) 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 twelfth surface S12 to the center of the thirteenth surface S13. EG6 is the distance in the optical axis direction (i.e., the edge distance) from the edge of the sixth lens 106 to the edge of the seventh lens 107. The center thickness of the cemented lens 145 is CT45, and CT45 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 cemented lens 145 is ET45, and ET45 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.

[0104] When 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, the Sag value of the object-side surface of the sixth lens 106 is Sag61, the Sag value of the sensor-side surface of the sixth lens 106 is Sag62, the Sag value of the object-side surface of the seventh lens 107 is Sag71, and the Sag value of the sensor-side surface of the seventh lens 107 is Sag72, the following conditions can be satisfied in terms of absolute value: Max_Sag52 < Max_Sag41, the following condition can be satisfied: Max_Sag 61 < Max_Sag52, and the following condition can be satisfied: Max_Sag72 < Max_Sag71 < Max_Sag52 < Sag41. In this way, by adjusting the lens surfaces from the center to the edge of the fifth lens 105 to the seventh lens 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 a straight line perpendicular to the center of the object-side surface or the sensor-side surface of each lens to the lens surface. When located on the object-side surface relative to the center, the Sag value can be negative, and when located on the sensor-side surface relative to the center, the Sag value can be positive.

[0105] Figure 3 yes Figure 1 Examples of lens data for an optical system of an embodiment of the present invention. Figure 3 As shown, the radius of curvature of the first lens 101 to the seventh lens 107 on the optical axis OA, the center thickness CT of each lens, the center spacing CG between adjacent lenses, the refractive index in the d-line, the Abbe number, and the size of the semi-aperture can be set. When the radius of curvature of each lens on the optical axis is expressed in absolute value, the radius of curvature of the eighth surface S4 of the fourth lens 104 on the optical axis OA can be the largest among the lenses, and the radius of curvature of the tenth surface S10 of the fifth lens 105 can be the smallest among the lenses. The difference between the maximum radius of curvature and the minimum radius of curvature can be 10 times or more, for example, 15 times or more. When the radius of curvature of each lens on the optical axis is expressed in absolute value, the radius of curvature of the first lens 101 on the optical axis can be smaller than the radius of curvature of the second lens 102 arranged on the sensor side of the aperture stop ST and the radius of curvature of the third lens 103 arranged on the object side. 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 i-th lens is Roi, the absolute value of the radius of curvature on the sensor side is Rsi, and the absolute value of the average value of the object side surface and the sensor side surface is Ri, and the value of (Roi-Rsi) / Ri may be minimum when i is 7, and maximum when i is 5. Here, when i is 6 or 7, the value of (Roi-Rsi) / Ri may be less than 1. Therefore, the ratio between the difference in the radius of curvature of the object side surface and the sensor side surface of each of the plurality of aspherical lenses and the average value of the radius of curvature of each aspherical lens may be smaller than that of the spherical lens.

[0106] 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 on the optical axis. Since the sixth lens 106 is aspherical and has a radius of curvature smaller than that of the first lens 101, the entire area may 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 on the optical axis. Since the seventh lens 107 is aspherical and has a radius of curvature smaller than that of the first lens 101, the entire area may be provided with uniform light distribution. The absolute value of the radius of curvature of the object side surface of the i-th lens is Roi, the absolute value of the radius of curvature of the sensor side is Rsi, and the absolute value of the average value of the object side surface and the sensor side surface means Ri, and the value of Roi / Rsi may be maximum when i is 5, and minimum when i is 4.

[0107] The radii of curvature of the first surface S1 and the second surface S2 of the first lens 101 are defined as L1R1 and L1R2, the radii of curvature of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 are defined as L7R1 and L7R2, and the radii of curvature of the respective lens surfaces of the second lens 102 to the sixth lens 106 can be defined as L2R1, L2R2, L3R1, L3R2, L4R1, L4R2 (L5R1), L5R2, L6R1, and L6R2. The ratio of the radius of curvature of the object-side surface to the radius of curvature of the sensor-side surface of each lens may satisfy the following conditions:

[0108] Condition 1: 0 < |L1R1 / L1R2| < 0.6, Condition 2: 0 < |L2R1 / L2R2| < 0.5

[0109] Condition 3: 0 < L3R1 / L3R2 < 0.4, Condition 4: 0 < L4R1 / L4R2 < 0.2

[0110] Condition 5: 10 < L5R1 / L5R2 < 30, Condition 6: 0 < L6R1 / L6R2 < 0.6

[0111] Condition 7: 1 < L7R1 / L7R2 < 2.2,

[0112] If the center thicknesses of the first lens 101 to the seventh lens 107 are defined as CT1 to CT7 and the edge thicknesses of the first lens 101 to the seventh lens 107 are defined as ET1 to ET7, then the sum of the center thicknesses of the first lens 101 to the seventh lens 107 can be defined as ∑CT, and the sum of the edge thicknesses of the first lens 101 to the seventh lens 107 can be defined as ∑ET. When explaining the thickness of the lens, the center thickness CT1 of the first lens 101 can be greater than the center thicknesses CT2 to CT7 of the second lens 102 to the seventh lens 107 and can have the maximum thickness within the lens portion 100. At least one of the fifth lens 105 and the seventh lens 107 can have the minimum center thickness CT5 and CT7 within the lens portion 100. The aspherical lenses include the sixth lens 106 and the seventh lens 107 and can satisfy the following conditions: CT7 < CT4 < CT6 < CT1. The ratio of the center thickness to the edge thickness of each lens may satisfy the following conditions:

[0113] Condition 1: 0.6 < CT1 / ET1 < 1.2, Condition 2: 1 < CT2 / ET2 < 2

[0114] Condition 3: 1.2 < CT3 / ET3 < 2.5, Condition 4: 1.5 < CT4 / ET4 < 3

[0115] Condition 5: 0 < CT5 / ET5 < 1, Condition 6: 0.6 < CT6 / ET6 < 2

[0116] Condition 7: 0.4 < CT7 / ET7 < 1.2, Condition 8: 0.5 < ∑CT / ∑ET < 1.2.

[0117] Through these conditions, the difference between the central thickness and the edge thickness of each lens can be effectively guided without increasing the light. In addition, the difference between the maximum central thickness and the minimum central thickness of the lens can be 7 mm or more, for example, in the range of 7 mm to 10.3 mm or 8 mm to 10 mm. That is to say, even if the central thickness of the last aspherical lens is set thin, the optical performance can not be reduced, and the thickness of the imaging device module can be set thin.

[0118] The relationship between the center of each lens and the TTL can satisfy the following conditions.

[0119] Condition 1: 0.15 < CT1 / TTL < 0.5 or 0.25 ≤ CT1 / TTL ≤ 0.35

[0120] Condition 2: 0 < CT2 / TTL < 0.1, Condition 3: 0 < CT3 / TTL < 0.1

[0121] Condition 4: 0.1 < CT4 / TTL < 0.25, Condition 5: 0 < CT5 / TTL < 0.1

[0122] Condition 6: 0 < CT6 / TTL < 0.2, Condition 7: 0 < CT7 / TTL < 0.1

[0123] The ratio of CT1 / TTL in Condition 1 can be greater than the values of Conditions 2 to 7.

[0124] The central thickness CT1 of the first lens 101 can be greater than the sum of the central thicknesses of two adjacent lenses. In addition, the central thickness CT1 of the first lens 101 can be greater than the sum of the central thicknesses of three adjacent lenses. For example, CT5 + CT6 < CT1, and CT2 + CT3 + CT4 < CT1 can be satisfied.

[0125] The relationship between the cemented lens 145 and the first lens 101 and the sixth lens 106 can satisfy the following conditions: Condition 1: 2 < CT1 / CT45 < 3, Condition 2: 1 < CT1 / CT6 < 1.8, Condition 3: 0.3 < CT1 / ∑CT < 0.55, Condition 4: 0.10 < CT45 / ∑CT < 0.25, and Condition 5: 0.15 < CT6 / ∑CT < 0.35.

[0126] ∑CT is the sum of the central thicknesses of the lenses, and CT45 is the sum of the central thicknesses of the fourth lens and the fifth lens. By setting the central thicknesses and edge thicknesses of the first lens 101 to the seventh lens 107 to the above conditions, light can be guided to an optimal path according to the refractive index, Abbe number, and radius of curvature of each lens within the optical system 1000.

[0127] The central distances between the first lens 101 to the seventh lens 107 are defined as CG1 to CG6, and the sum of the central distances between the first lens 101 to the seventh lens 107 can be defined as ∑CG. Here, the central distances between the lenses that do not include the gaps between two lenses in the cemented lens are described. The central distance CG2 between the second lens 102 and the third lens 103 or the central distance CG6 between the sixth lens 106 and the seventh lens 107 is the largest, and for example, the central distance CG6 between the sixth lens 106 and the seventh lens 107 can be the largest. The central distance CG3 between the third lens 103 and the fourth lens 104 is the smallest. The central distance between aspherical lenses is greater than the central distance between spherical lenses. The central thickness between each lens and the central distance between adjacent lenses can satisfy the following conditions.

[0128] Condition 1: 20 < CT1 / CG1 < 60, Condition 2: 0 < CT2 / CG2 < 2

[0129] Condition 3: 5 < CT3 / CG3 < 20, Condition 4: 3 < CT45 / CG5 < 10

[0130] Condition 5: 0.1 < CG6 / ∑CG < 0.6

[0131] By setting the maximum central thickness to more than 3 times the maximum central distance between the lenses, for example, in the range of 3.5 times to 7 times, an imaging device module can be provided that applies an aspherical lens to the output side of the optical system without increasing the central distance compared to the central thickness of each lens. Here, if the central distance between the i-th adjacent two lenses is defined as CGi and the central thickness of the i-th lens closer to the object than CGi is defined as CTi, the following conditions can be satisfied (here, the central thickness of the cemented lens and the distance between the cemented lenses are not included). CGi is the central distance between the i-th lens and the i + 1-th lens. The ratio CTi / CGi can be the smallest when i is 5 and the largest when i is 1.

[0132] Regarding the effective diameter, the lens with the largest effective diameter can be the first lens 101 closest to the object. The first lens 101 with the largest effective diameter can be a spherical lens. The lens with the smallest effective diameter can be the lens closest to the image sensor 300, such as 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. The effective diameters of the first surface S1 and the second surface S2 of the first lens 101 can be defined as CA11 and CA12. The effective diameters of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 can be defined as CA71 and CA72. And the effective diameters of the object-side surfaces and the sensor-side surfaces of the second lens to the sixth lens can be defined as CA21, CA22, CA31, CA32, CA41, CA42, CA51, CA52, CA61, and CA62. The effective diameter of each lens can satisfy the following conditions.

[0133] Condition 1: CA22 < CA12, Condition 2: CA71 < CA72

[0134] Condition 3: CA31 < CA22, Condition 4: CA61 < CA51 < CA41.

[0135] If the refractive index is described, the refractive index of the fifth lens 105 is the largest among the lenses and can be greater than 1.70, for example, greater than 1.75. The refractive index of the sixth lens 106 is the smallest among the lenses. The difference between the largest refractive index and the smallest refractive index can be greater than 0.20, for example, greater than 0.25. By adjusting the refractive indices of the spherical lens and the aspherical lens, the incident efficiency can be improved, and the incident light can be guided to the image sensor 300. If the Abbe number is described, the Abbe number of the sixth lens 106 is the largest among the lenses and can be greater than 60. The Abbe number of the seventh lens 107 is the smallest among the lenses. The difference between the largest Abbe number and the smallest Abbe number can be greater than 30. Make the Abbe numbers of the third lens 103 and the fourth lens 104 adjacent to the aperture stop ST greater than the Abbe numbers of the first lens 101 and the fifth lens 105, and make the Abbe number of the seventh aspherical lens 107 closest to the image sensor 300 the smallest, so as to control the dispersion of the light traveling between the lenses made of glass and increase the dispersion between the spherical lens and the aspherical lens to guide the light to the image sensor 300.

[0136] The average effective diameter of the spherical lens is SSL_CA_Aver, and when the average effective diameter of the aspherical lens is ASL_CA_Aver, the following condition can be satisfied: ASL_CA_Aver < SSL_CA_Aver. The average center thickness of the spherical lens is SSL_CT_Aver, and when the average center thickness of the aspherical lens is ASL_CT_Aver, the following condition can be satisfied: ASL_CT_Aver < SSL_CT_Aver. The average refractive index of the spherical lens is SSL_Nd_Aver, and the average refractive index of the aspherical lens is ASL_Nd_Aver, such that the following condition can be satisfied: ASL_Nd_Aver < SSL_Nd_Aver. The average Abbe number of the spherical lens is SSL_Ad_Aver, and the average Abbe number of the aspherical lens is ASL_Ad_Aver, such that the following condition can be satisfied: SSL_Ad_Aver < ASL_Ad_Aver.

[0137] The focal lengths F1, F5, and F7 of the first lens 101, the fifth lens 105, and the seventh lens 107 have negative refractive powers, and the focal lengths F2, F3, F4, and F6 of the second lens 102, the third lens 103, the fourth lens 104, and the sixth lens 106 can have positive refractive powers. Additionally, the sixth lens 106 and the seventh lens 107, which are arranged adjacent to each other, can satisfy the following conditions.

[0138] Condition 1: The refractive index of the lens with positive refractive power < the refractive index of the lens with negative refractive power

[0139] Condition 2: The dispersion of the lens with positive refractive power > the dispersion of the lens with negative refractive power

[0140] Here, since the sixth lens 106 has positive refractive power and the seventh lens 107 has negative refractive power, according to Condition 1 and Condition 2, the refractive index of the sixth lens 106 is less than the refractive index of the seventh lens 107, and the dispersion value of the sixth lens 106 is greater than the dispersion value of the seventh lens 107. The chromatic aberration that appears in the fourth lens and the fifth lens can be corrected using an aspherical lens. Additionally, by satisfying that the refractive index difference between the sixth lens 106 and the seventh lens 107 arranged in sequence is 0.2 or more and 0.6 or less and the Abbe number difference is 30 or more and 70 or less, the chromatic aberration that appears in the spherical lens can be compensated using an aspherical lens.

[0141] The optical system 1000 generates chromatic aberration, and corrects the chromatic aberration by using a cemented lens 145 or two lenses arranged in series. When the temperature changes from low to high, the lens repeatedly contracts and expands. Since the lens characteristics of the lenses of the same material change by the same amount according to the temperature change, it is effective to correct the chromatic aberration between the lenses of the same material even when the temperature changes. The chromatic aberration between the spherical lens and the aspherical lens can be mutually corrected by using the fourth lens 104 and the fifth lens 105 and the sixth lens 106 and the seventh lens 107. The refractive index difference between the fourth lens 104 and the fifth lens 105 as cemented lenses is 0.01 or more and 0.30 or less and the Abbe number difference is 20 or more and 40 or less, and the chromatic aberration generated in the spherical lens can be compensated by the spherical lens. The refractive index difference is rounded to the third decimal place, and the Abbe number difference is rounded to the first decimal place, and these values ​​are compared. In addition, by arranging a glass lens having a relatively high Abbe number on the object side of the aspherical seventh lens 107, dispersion can be reduced by the glass lens, and dispersion can be increased by the aspherical lens.

[0142] When the focal length is expressed as an absolute value, the focal length of the first lens 101 is the largest among the lenses and may be 45 or more. The focal length of the fifth lens 105 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length may be 35 or more. By making the focal length of the lens closest to the object the largest and setting the focal length of the fifth lens 105 adjacent to the aspherical lens to the smallest, the optical system may have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. in a set field of view range, and may have good optical performance at the periphery of the field of view. The sensor-side surface of the seventh lens 107 has a Sag value that increases from the optical axis to a point of 2.8 mm ± 0.4 mm in a direction perpendicular to the optical axis and then decreases from the point of 2.8 mm ± 0.4 mm toward the edge. If a critical point exists on the sensor side of the seventh lens 107, i.e., the sensor side of the last lens, i.e., on the lens surface closest to the sensor, TTL may be reduced, which is conducive to miniaturization and weight reduction of the optical system.

[0143] like Figure 4 As shown, in the lens of the lens portion 100 in the first embodiment, the lens surfaces of the sixth lens 106 and the seventh lens 107 may include an aspheric surface having a 30th order aspheric coefficient. For example, the sixth lens 106 and the seventh lens 107 may include a lens surface having a 30th order aspheric coefficient. As described above, since the aspheric surface having a 30th order aspheric coefficient (a value other than "0") can significantly change the aspheric shape of the peripheral portion, the optical performance of the peripheral portion of the FOV can be well compensated. Figure 5As shown, the thicknesses T1 to T7 of the first lens 101 to the seventh lens 107 and the distances G1 to G6 between two adjacent lenses may be set. Figure 5 As shown, the thickness T1 to T7 of each lens in the Y-axis direction perpendicular to the optical axis can be represented by an interval of 0.1 mm or 0.2 mm or more from the optical axis, and the distance G1 to G6 between each lens can be represented by an interval of 0.1 mm or 0.2 mm or more from the optical axis.

[0144] The center thickness CT45 of the cemented lens 145 may be greater than the edge thickness ET45. The center thickness CT45 of the cemented lens 145 is the distance 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 in the optical axis direction, and 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 cemented 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 of 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 of the minimum thickness.

[0145] like Figure 6 As shown, Figure 1 The chief ray angle (CRA) of the optical system and the camera module may be 10 degrees or more, for example, in the range of 10 degrees to 35 degrees or 10 to 25 degrees. Fig. 20 As shown in the figure showing the relative illumination or ambient light ratio according to the image height in the optical system according to the embodiment, it can be seen that according to the temperature change at room temperature, low temperature and high temperature, the ambient light ratio is 80% or more, for example, 84% or more from the center to the diagonal end of the image sensor. That is, it can be seen that the difference in ambient illumination according to the temperature change is almost the same from the optical axis to 4.6 mm.

[0146] Figures 7 to 9 It is shown in Figure 1 Graphs of the diffraction MTF of an optical system at room temperature, low temperature, and high temperature, and graphs showing modulation according to spatial frequency. Figures 7 to 9 As shown, in the first embodiment of the present invention, the deviation of the MTF at low or high temperature relative to room temperature may be less than 10%, ie, 7% or less. Figures 10 to 12 It is shown Figure 1 Graphs showing aberration characteristics at room temperature, low temperature, and high temperature in an optical system. Figures 10 to 12From left to right, the aberration curves of the image are the curves for measuring spherical aberration (longitudinal spherical aberration), astigmatism field curve and distortion. Figures 10 to 12 In , the X-axis may represent the focal length (mm) and the degree of distortion (%), and the Y-axis may represent the height of the image. In addition, the graph of spherical aberration is a graph of light with a wavelength band of about 435nm, about 486nm, about 546nm, about 587nm, and about 656nm, and the graph of astigmatism and distortion is a graph of light with a wavelength band of about 546nm. Figures 10 to 12 In the aberration diagram, 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. It can be seen that the optical system 1000 according to the embodiment has measurement values ​​close to the Y-axis in almost all areas. That is, the optical system 1000 according to the embodiment has improved resolution and can have good optical performance not only in the central part of the FOV but also in the peripheral part. Here, the low temperature is -20 degrees or lower, for example, -20 degrees to -40 degrees, the room temperature is 22 degrees ±5 degrees or 18 degrees to 27 degrees, and the high temperature can be 85 degrees or higher, for example, 85 degrees to 105 degrees. Therefore, it can be seen that Figures 10 to 12 The decrease in modulation from low temperature to high temperature is less than 10%, such as 5% or less, or almost no change.

[0147] Table 1 compares the changes in optical properties such as EFL, BFL, F number, TTL and diagonal FOV of the optical system according to the first embodiment at room temperature, low temperature and high temperature, and it can be seen that the rate of change of the optical properties at low temperature is 5% or less, for example, 3% or less, based on room temperature, and it can be seen that the rate of change of the optical properties at low temperature is 5% or less, for example, 3% or less, based on room temperature.

[0148] [Table 1]

[0149]

[0150]

[0151] Therefore, as shown in Table 1, according to the change in optical characteristics with temperature change from low temperature to high temperature, for example, the rate of change of EFL, TTL, BFL, F number (F#) and diagonal FOV is 10% or less, that is, 5% or less, for example, in the range of 0 to 5%. This means that even if at least one or two or more aspherical lenses are used, temperature compensation of the aspherical lenses can be designed to prevent the reliability of optical characteristics from deteriorating. In addition, it can be seen that even if the temperature changes from room temperature to low temperature or high temperature, EFL, TTL, BFL, F number (F#) and diagonal FOV hardly change. 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 central part of FOV but also in the peripheral part.

[0152] The optical system and the camera module according to the second embodiment of the present invention will be described with reference to Figures 13 to 19 The configuration of the second embodiment will be described with reference to the first embodiment, and a configuration different from the first embodiment will be described.

[0153] Reference Fig.13 and Fig.14 , the optical system 1000 according to the second embodiment includes a lens part 100A, and the lens part 100A may include first to seventh lenses 111 to 117. 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.

[0154] The first lens 111 may have a negative (-) refractive power and may be made of glass. The object-side first surface S1 of the first lens 111 on the optical axis may be concave, and the sensor-side second surface S2 may have a convex shape. The first lens 111 may have a meniscus shape convex toward the sensor side. The first lens 111 is made of a spherical glass material, has high transmittance and refractive index, and is set with a thick thickness to prevent degradation of the optical characteristics of the incident side lens and protect the surface. The second lens 112 has a positive (+) refractive power on the optical axis OA and may be made of a spherical glass material. The third surface S3 of the second lens 112 on the optical axis OA may be convex, and the fourth surface S4 may have a concave shape. An aperture stop ST may be arranged on the periphery of the sensor-side surface of the second lens 112. The third lens 113 has a positive (+) refractive power on the optical axis OA, and may include a glass material. The object-side fifth surface S5 of the third lens 113 on the optical axis may be convex, and the sensor-side sixth surface S6 may have a concave shape. The third lens 113 may be configured as a spherical lens made of glass.

[0155] The fourth lens 114 has a positive (+) refractive power on the optical axis OA and may include a spherical glass material. The object-side seventh surface S7 of the fourth lens 114 on the optical axis may be convex, and the sensor-side eighth surface S8 may have a concave shape. The fifth lens 115 has a negative (-) refractive power on the optical axis OA and may be set as a spherical glass material. Based on the optical axis OA, the ninth surface on the object side of the fifth lens 115 may have a convex shape, and the tenth surface S10 on the sensor side may have a concave shape. The fourth lens 114 and the fifth lens 115 may be bonded and may be defined as a cemented lens 145. The fourth lens 114 and the fifth lens 115 may have opposite refractive powers. The composite refractive power of the fourth lens 114 and the fifth lens 115 may have a positive refractive power. When the composite refractive power of the cemented lens 145 is F45, the composite refractive power of the first lens 101 and the second lens 102 is F12, and the composite refractive power of the third lens 103 to the seventh lens 107 is F37, the following condition can be satisfied in absolute value: F37 <F45<F12。

[0156] The effective diameter of the fourth lens 114 may be greater than the diagonal length of the image sensor 300. The effective diameter of the fifth lens 115 may be smaller than the effective diameter of the fourth lens 114, and may have a length within the range of ±110% or ±105% 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 greater than the diagonal length of the image sensor 300. Since the cemented lens 145 is located between the spherical lens and the aspherical lens, chromatic aberration correction may be more efficient.

[0157] The sixth lens 116 may have a positive (+) refractive power on the optical axis OA and may be set using a glass material. Based on the optical axis OA, the eleventh surface S11 on the object side of the sixth lens 116 may be convex, and the twelfth surface S12 on the sensor side may be concave. The sixth lens 116 may be made of glass and may have aspherical surfaces on both sides. The eleventh surface S11 and the twelfth surface S12 may have aspherical surfaces, and the aspherical coefficients may be set to Fig.15 S1 and S2 of L6. Since the sixth lens 116 is made of an aspherical glass material, the refraction efficiency of light can be improved, and the thickness can be increased to improve the assembly problem caused by the aspherical lens. In addition, the sixth lens 116 made of a glass material with a thick thickness can perform thermal compensation according to temperature changes, thereby preventing degradation of optical characteristics. The sixth lens 116 is disposed between the spherical lens and the aspherical lens, so that degradation of optical performance can be prevented, and the influence on the improvement of aberration characteristics and resolution can be controlled.

[0158] The seventh lens 117 has a negative (-) refractive power on the optical axis and may be set as an aspherical plastic lens. The object side thirteenth surface S13 of the seventh lens 117 on the optical axis may have a convex shape, and the sensor side fourteenth surface S14 may have a concave shape. The seventh lens 117 may be made of a plastic material and have aspherical surfaces on both sides. The thirteenth surface S13 and the fourteenth surface S14 have aspherical surfaces, and the aspherical coefficient may be set to Fig.15 S1 and S2 of L7 in. The thirteenth 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 thirteenth surface S13 may be located at a position less than or equal to 2.7 mm from the optical axis OA, for example, in the range of 2 mm to 2.7 mm. As another example, the thirteenth surface S13 may be set to have no critical point. The fourteenth 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 fourteenth surface S14 may be located closer to the edge than the critical point of the thirteenth surface S13, and may be located at a position greater than or equal to 2.9 mm from the optical axis OA, for example, in the range of 2.9 mm to 3.7 mm. Since the fourteenth surface S14 and the thirteenth surface S13 have critical points, they can refract incident light to the periphery of the image sensor 300. In the seventh lens 117, if the Sag value of the object side surface is Sag71 and the Sag value of the sensor side surface is Sag72, the following condition can be satisfied: 0<|Sag71|-|Sag72|<0.3mm. Therefore, since the thickness difference between the center and the edge of the seventh lens 117 is not large and the radius of curvature is not large, the influence on the optical characteristics can be suppressed. Since the sixth lens 116 and the seventh lens 117 are arranged as aspherical lenses, they are resistant to temperature changes, the number of lenses can be reduced, and the TTL of the optical system can be reduced.

[0159] Fig.14 yes Fig.13 Examples of lens data for an optical system of an embodiment of the present invention. Fig.14As shown, the absolute value of the radius of curvature of the first lens 111 on the optical axis can be smaller than the absolute value of the radius of curvature of the second lens 112 arranged on the object side of the aperture stop ST. The absolute value of the radius of curvature of the object-side surface of the i-th lens is Roi, the absolute value of the radius of curvature of the sensor side is Rsi, and the absolute value of the average of the object-side surface and the sensor-side surface is Ri. The value of (Roi - Rsi) / Ri can be the minimum when i is 7 and the maximum when i is 2. Here, when i is 6 or 7, the value of (Roi - Rsi) / Ri can be less than 1, for example, 0.8 or less. Therefore, the ratio between the difference in the radii of curvature of the object-side surface and the sensor-side surface of each lens among the plurality of aspherical lenses and the average value of the radius of curvature of each aspherical lens can be smaller than that of the spherical lens. Since the first lens 111 is set as a spherical lens with a thick thickness, the radius of curvature on the optical axis can be increased, the difference in the radii of curvature of the object-side surface and the sensor-side surface will not be significantly reduced, and the assemblability can be improved.

[0160] The radii of curvature of the sixth lens 116 and the seventh lens 117 on the optical axis can be smaller than the radius of curvature of the first spherical lens 111. Therefore, the aspherical sixth lens 116 and the aspherical seventh lens 117 can guide the light incident through the first lens 111 to the fifth lens 115 to the entire area of the image sensor 300. The ratio of the radii of curvature of each lens can satisfy the following conditions.

[0161] Condition 1: 0 < |L1R1 / L1R2| < 1, Condition 2: 0 < |L2R1 / L2R2| < 0.2

[0162] Condition 3: 0 < L3R1 / L3R2 < 0.5, Condition 4: 0 < L4R1 / L4R2 < 0.5

[0163] Condition 5: 5 < L5R1 / L5R2 < 15, Condition 6: 0.1 < L6R1 / L6R2 < 1

[0164] Condition 7: 1 < L7R1 / L7R2 < 2.2

[0165] When describing the thickness of the lenses, the central thickness CT1 of the first lens 111 may have the maximum thickness in the lens portion 100A. The central thickness CT6 of the sixth lens 116 may be greater than the central thicknesses of the second lens 112 to the fifth lens 115, and greater than the central thickness of the seventh lens 117. The central thickness CT5 of the fifth lens 115 may have the minimum thickness in the lens portion 100A. The central thickness CT1 of the first lens 111 may be greater than the central thickness CT45 of the cemented lens 145. The edge thickness ET1 of the first lens 111 may be greater than the edge thickness ET45 of the cemented lens 145. The central thickness and edge thickness of each lens may satisfy the following conditions.

[0166] Condition 1: 0.6 < CT1 / ET1 < 1.2, Condition 2: 1 < CT2 / ET2 < 3

[0167] Condition 3: 1 < CT3 / ET3 < 3, Condition 4: 1 < CT4 / ET4 < 3

[0168] Condition 5: 0 < CT5 / ET5 < 1, Condition 6: 0.6 < CT6 / ET6 < 1.5

[0169] Condition 7: 0 < CT7 / ET7 < 1.2, Condition 8: 1 < ∑CT / ∑ET < 1.5

[0170] The central spacing CG3 between the third lens 113 and the fourth lens 114 is the largest and greater than the central spacings between spherical lenses and between aspherical lenses. The central spacing CG6 between the sixth lens 116 and the seventh lens 117 may satisfy the following condition: CG1 < CG2 < CG6. The central thickness of each lens in the lens and the central spacing between adjacent lenses may satisfy the following conditions.

[0171] Condition 1: 20 < CT1 / CG1 < 80, Condition 2: 2 ≤ CT2 / CG2 < 5

[0172] Condition 3: 0.5 < CT3 / CG3 < 2, Condition 4: 3 < CT45 / CG5 < 10

[0173] Condition 5: 0.1 < CG3 / ∑CG < 0.6, Condition 6: 0.1 < CT1 / CG3 < 0.6

[0174] By setting the maximum center thickness to at least 3 times the maximum center distance between the lenses, for example, within the range of 3 to 7 times, an imaging device module can be provided that applies aspherical lenses to the incident side and the output side of an optical system without increasing the center distance compared to the center thickness of each lens. Here, if the i-th center distance among the center distances of two adjacent lenses is defined as CGi and the center thickness of the i-th lens closer to the object than CGi is defined as CTi, the following conditions can be satisfied. The ratio CTi / CGi can be maximum when i = 1 and minimum when i = 5 (excluding the thickness of the cemented lenses and the distance between the cemented lenses).

[0175] The relationship between the center thickness of each lens and the TTL can satisfy the following conditions.

[0176] Condition 1: 0.2 < CT1 / TTL < 0.5 or 0.3 < CT1 / TTL < 0.37

[0177] Condition 2: 0 < CT2 / TTL < 0.2 or 0 < CT1 / TTL < 0.1

[0178] Condition 3: 0 < CT3 / TTL < 0.1, Condition 4: 0.1 < CT4 / TTL < 0.25

[0179] Condition 5: 0 < CT5 / TTL < 0.1, Condition 6: 0.1 < CT6 / TTL < 0.3

[0180] Condition 7: 0 < CT7 / TTL < 0.1

[0181] The ratio CT1 / TTL of Condition 1 can be greater than the values of Conditions 2 to 7.

[0182] In terms of the effective diameter, the lens with the largest effective diameter can be the first lens 111. The first lens 111 with the largest effective diameter can be a spherical lens. The lens with the smallest effective diameter can 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.

[0183] Condition 1: CA22 < CA12, Condition 2: CA71 < CA72

[0184] Condition 3: CA22 < CA31, Condition 4: CA61 < CA51 < CA41

[0185] Condition 5: CA4 < CA2 < CA1, Condition 6: CA5 < CA4 < CA3

[0186] Regarding the refractive index, the refractive index of the fifth lens 115 is the largest among the lenses and may be greater than 1.70, for example, greater than 1.80. The refractive index of the sixth lens 116 is the smallest among the lenses. The difference between the maximum refractive index and the minimum refractive index may be greater than 0.25, for example, greater than 0.30. By adjusting the refractive indices of the spherical lens and the aspherical lens, the incident efficiency may be improved and the incident light may be guided to the image sensor 300. When explaining the Abbe number, the Abbe number of the sixth lens 116 is the largest among the lenses and may be 60 or greater. The Abbe number of the seventh lens 117 is the smallest among the lenses. The difference between the maximum refractive power and the minimum Abbe number may be 30 or greater.

[0187] The optical system 1000 causes chromatic aberration, and corrects the chromatic aberration by using a cemented lens 145 or two lenses arranged in series. When the temperature changes from low to high, the lens repeatedly contracts and expands. Since the lens characteristics of the same material change by the same amount according to the temperature change, it is effective to correct the chromatic aberration between lenses of the same material even when the temperature changes. By using the fourth lens 114 and the fifth lens 115 and the sixth lens 116 and the seventh lens 117, the chromatic aberration between the spherical lens and the aspherical lens can be corrected with each other, and the TTL of the optical system can be reduced. The refractive index difference between the fourth lens 114 and the fifth lens 115 as the cemented lenses is 0.01 or more and 0.30 or less, and the Abbe number difference is 20 or more and 40 or less, and the chromatic aberration occurring in the spherical lens can be compensated by the spherical lens.

[0188] If the focal length is expressed as an absolute value, the focal length of the first lens 111 is the largest among the lenses and can be 45 or more. The focal length of the fifth lens 115 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length can be 35 or more. By maximizing the focal length of the lens closest to the object and setting the focal length of the fifth lens 115 adjacent to the aspheric lens to the minimum, the optical system can have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set field of view, and can have good optical performance in the periphery of the field of view. The critical points and Sag values ​​of the object side surface and the sensor side surface of the seventh lens 117 above should refer to the description of the first embodiment.

[0189] like Fig.15As shown, among the lenses of the lens portion 100A in the embodiment, the lens surfaces of the sixth lens 116 and the seventh lens 117 may include an aspheric surface having a 30th order aspheric coefficient. For example, the sixth lens 116 and the seventh lens 117 may include a lens surface having a 30th order aspheric coefficient. As described above, since the aspheric surface having a 30th order aspheric coefficient (a value other than "0") can significantly change the aspheric shape of the peripheral portion, the optical performance of the peripheral portion of the FOV can be well corrected. Fig.16 As shown, the thicknesses T1 to T7 of the first to seventh lenses 121 to 127 and the distances G1 to G6 between two adjacent lenses may be represented by intervals of 0.1 mm or 0.2 mm or more from the optical axis in the Y-axis direction.

[0190] The center thickness CT45 of the cemented lens 145 may be greater than the edge thickness ET45. The center thickness CT45 of the cemented 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, and 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 cemented lens 145 is at the center, the minimum thickness is at the edge, and the maximum thickness may be 1.1 times or more of the minimum thickness, for example, in the range of 1.1 times to 2.5 times.

[0191] like Fig.17 As shown, Fig.13 The CRA in the optical system and camera module may be 10 degrees or greater, such as in the range of 10 degrees to 35 degrees or in the range of 10 degrees to 25 degrees. Fig. 20 As shown, a graph showing the relative illumination or ambient light ratio according to image height in an optical system according to an embodiment shows that, according to the temperature change between low temperature and high temperature, the ambient light ratio from the center of the image sensor to the diagonal end is 70% or greater, for example, 75% or greater.

[0192] Fig.18 It is shown Fig.13 The graph of the diffraction MTF at room temperature in the optical system of FIG. 1 and the graph showing the modulation ratio according to the spatial frequency. In the second embodiment of the present invention, the deviation of the MTF based on room temperature relative to low temperature or high temperature can be less than 10%, that is, 7% or less. Fig.19 It is shown Fig.13 A curve diagram of the aberration characteristics of the optical system at room temperature. Fig.19In the aberration curve diagram, it can be interpreted that the closer each curve is to the Y-axis at room temperature, the better the aberration correction function. It can be seen that in the optical system 1000 according to the embodiment, the measured values ​​are close to the Y-axis in almost all areas. That is, the optical system 1000 according to the embodiment has improved resolution and can have good optical performance not only in the central part of the FOV but also in the peripheral part. Here, the low temperature is -20 degrees or lower, for example, in the range of -20 degrees to -40 degrees, the room temperature is in the range of 22 degrees ±5 degrees or in the range of 18 degrees to 27 degrees, and the high temperature can be 85 degrees or higher, for example, in the range of 85 degrees to 105 degrees. Therefore, it can be seen that Figures 10 to 12 The decrease in the brightness ratio (modulation) from low temperature to high temperature is less than 10%, for example 5% or less, or hardly changes. Therefore, it can be seen that the optical system according to the second embodiment has a change in optical characteristics such as EFL, TTL, BFL, F number and diagonal FOV according to the temperature change from low temperature to high temperature in the range of 10% or less, that is, 5% or less, for example, in the range of 0 to 5%. This makes it possible to design temperature compensation of the aspheric lens even when at least one or two or more aspheric lenses are used, thereby preventing the reliability of the optical characteristics from being reduced. 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 central part of the FOV but also in the peripheral part.

[0193] The optical system and the camera module according to the third embodiment of the present invention will be described with reference to Figures 21 to 33 In the third embodiment, the same configuration as that of the first and second embodiments will be described with reference to the description of the first and second embodiments.

[0194] Reference Fig.21 , the lens portion 100B includes a first lens group LG1 and a second lens group LG2, and the number of lenses of the second lens group LG2 may be four times or five times the number of lenses of the first lens group LG1. The second lens group LG2 may include two or more lenses made of glass, and, for example, may include two to five lenses made of glass. The second lens group LG2 may include one or more plastic lenses, for example, one to three plastic lenses.

[0195] At least two lenses closest to the sensor side in the optical system 1000 may be plastic lenses. The lens with the maximum Abbe number may be located in the second lens group LG2, and the lens with the maximum refractive index may be located in the first lens group LG1. The maximum Abbe number may be 65 or more, and the maximum refractive index may be 1.75 or more. The lens with the maximum effective diameter may be a lens close to the object side, or one of a lens between two object side lenses and a lens between two sensor side lenses. Preferably, the lens with the maximum effective diameter may be disposed between glass side lenses.

[0196] TTL may be more than 2 times, for example, more than 4 times and less than 10 times, of ImgH. EFL is set to 10 mm or more, and FOV is less than 45 degrees, so that it can be set as a standard optical system in a vehicle camera module. The condition of TTL / (2*ImgH) may be 2.5 or more or 2.7 or more, for example, may be in the range of 2.5 to 4.5. By setting the value of TTL / (2*ImgH) in the optical system 1000 to 2.5 or more, a vehicle lens optical system may be provided.

[0197] The effective diameter of at least one or all of the plastic lenses in the optical system 1000 may be smaller than the length of the image sensor 300. The effective diameter is the diameter or length of the effective area where light is incident. The length of the image sensor 300 is the maximum length of a diagonal line in a direction orthogonal to the optical axis OA. In the optical system 1000, the number of lenses having an effective diameter greater than the length of the image sensor 300 may be 50% or more, and the number of lenses having an effective diameter less than the length of the image sensor 300 may be less than 50%.

[0198] The effective diameter of the lens arranged on the object side based on the cemented lens 145 in the lens section 100B may be larger than the length of the image sensor 300. The effective diameter of the lens arranged on the sensor side based on the cemented lens 145 may be smaller than the length of the image sensor 300. In addition, the object side lens in the cemented lens 145 may be larger than the length of the image sensor 300, and the sensor side lens may be arranged within a range of ±110% of the length of the image sensor 300.

[0199] The optical axis distance between the first lens group LG1 and the second lens group LG2 may be 1 times or less of the optical axis distance of the first lens group LG1, and, for example, may be in the range of 0.5 times to 1 times of the optical axis distance of the first lens group LG1. The optical axis distance between the first lens group LG1 and the second lens group LG2 may be 0.2 times or less of the optical axis distance of the second lens group LG2, and, for example, may be in the range of 0.01 times to 0.2 times. Here, among the lens surfaces of the first lens group LG1 and the second lens group LG2, two surfaces facing each other, for example, the sensor side surface of the object side lens may be convex, and the object side surface of the sensor side lens may be concave. That is, in the first lens group LG1, the sensor side surface closest to the sensor side may be convex, and in the second lens group LG2, the object side surface closest to the object side may be concave. The first lens group LG1 may refract light incident through the object side to gather, and the second lens group LG2 may refract light emitted through the first lens group LG1 to the image sensor 300.

[0200] The first lens group LG1 may have a negative (-) refractive power, and the second lens group LG2 may have a positive (+) refractive power. Among the lenses of the first lens group LG1, the lens closest to the object side may have a negative (-) refractive power, and among the lenses of the second lens group LG2, the lens closest to the sensor side may have a negative (-) refractive power. When the focal length is expressed as an absolute value, the focal length of the first lens group LG1 may be at least twice the focal length of the second lens group LG2, for example, in the range of 2 times to 10 times. The EFL of the optical system 1000 may be smaller than the absolute value of the focal length of the first lens group LG1. The EFL of the optical system 1000 may be smaller than the absolute value of the focal length of the first lens group LG1 and greater than the absolute value of the focal length of the second lens group LG2. The number of lenses having a negative (-) refractive power on the optical system 1000 may be smaller than the number of lenses having a positive (+) refractive power. The number of lenses having negative (-) refractive power may be 50% or less, compared to the total number of lenses, for example, in the range of 25% to 50% or 32% to 49%.

[0201] The number of lenses of the plastic material lenses in the lens portion 100B may be 60% or less of the total number of lenses, and may be in the range of 20% to 50% or 25% to 45%. The effective diameter of the lens closest to the object side in the lens portion 100B may be larger than the effective diameter of the lens closest to the image sensor 300. Therefore, the brightness of the optical system can be controlled. The lens portion 100B may include a first lens 121, a second lens 122, a third lens 123, a fourth lens 124, a fifth lens 125, a sixth lens 126, and a seventh lens 127 aligned along the optical axis from the object side toward the sensor side.

[0202] When the focal length is an absolute value, the focal length of the lens closest to the object can be greater than the focal length of the plastic lens. Here, the plastic lens can be at least one lens arranged on the sensor side of the cemented lens, or at least one lens adjacent to the image sensor. The focal length F1 of the first lens 121 can be the largest in the optical system and can be greater than the focal length (absolute value) of the second lens group LG2. That is, the following condition can be satisfied: |FLG2| < F1.

[0203] For example, in terms of the center thickness CT of the lens, the center thickness of at least two or more of the glass lenses can be greater than the center thickness of the plastic lens. If the average center thickness of the glass lenses in the lens part 100B is GLCT_Aver and the average center thickness of the plastic lens is PLCT_Aver, then the following condition can be satisfied: GLCT_Aver > PLCT_Aver. Additionally, the following condition can be satisfied: 1.2 < GLCT_Aver / PLCT_Aver < 2.3. The lens closest to the object in the lens part 100B can have the highest refractive index, which is greater than 1.7, for example 1.8 or higher. The refractive index of the lens closest to the object can be greater than the refractive index of the plastic lens. The number of lenses in the lens part 100B with a refractive index lower than the average refractive index of the plastic lens can be 2 or less, for example 1. The plastic lens can have an aspherical object-side surface and sensor-side surface, and a refractive index less than 1.7.

[0204] If the average refractive index of the glass lenses in the lens part 100B is GLn_Aver and the average refractive index of the plastic lens is PLn_Aver, then the following condition can be satisfied: PLn_Aver < GLn_Aver. Additionally, the following condition can be satisfied: 1 < GLn_Aver / PLn_Aver < 1.2. Lenses with a high refractive index can be located on the object side of the plastic lens to increase chromatic aberration.

[0205] The average Abbe number of the glass lenses in the lens part 100B can be greater than the average Abbe number of the plastic lens. The average Abbe number of the plastic lens can be 45 or less. The number of glass lenses in the lens part 100B with an Abbe number lower than the average Abbe number of the plastic lens can be 2 or less, for example 1. When the average Abbe number of the glass material lenses is GLv_Aver and the average Abbe number of the plastic lens is PLv_Aver, the following condition can be satisfied: PLv_Aver < GLv_Aver. Additionally, the following condition can be satisfied: 1 < GLv_Aver / Plv_Aver < 1.5. Lenses with a low Abbe number can improve chromatic aberration at the position adjacent to the image sensor 300.

[0206] In the lens portion 100B, the number of lenses having an effective diameter larger than the average effective diameter of the plastic lenses may be 3 or more, for example, 4 or more. When the average effective diameter of the plastic material lens is CA_PL_Aver and the average effective diameter of the glass material lens is CA_GL_Aver, the following conditions may be satisfied: CA_PL_Aver < CA_GL_Aver. Additionally, the following condition may be satisfied: 1 < CA_GL_AVER / CA_PL_AVER < 1.5. 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 following condition: 1 ≤ (ImgH * 2) / CA_PL_Aver < 1.5. Additionally, the relationship between the average effective diameter of the glass material and the length of the image sensor 300 may satisfy the following condition: 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. Thus, by arranging the plastic lens with a small effective diameter adjacent to the image sensor 300, the plastic lens can disperse the color from the center to the periphery of the image sensor 300.

[0207] In the third embodiment, the fifth lens is arranged on the object side of the plastic lens, and since the fifth lens is the lens closest to the plastic lens among the glass lenses, the effective diameter ratio of the object side surface to the sensor side surface of the fifth lens may satisfy Equation 18 or Equation 18-1. Conversely, if the plastic lens closest to the object side is arranged as the n-3rd, n-4th, or n-5th (n = 6 to 8), then when the glass lens is arranged on the object side surface of the n-3rd, n-4th, or n-5th plastic lens, the effective diameter ratio of the object side surface GL1_S1 to the sensor side surface GL1_S2 of the glass lens closest to the plastic lens may satisfy: 1 < CA_GL1_S1 / CA_GL1_S2 < 2, or the effective diameter difference (mm) of these lenses may satisfy: 1.7 < CA_GL1_S1 - CA_GL_S2 < 3.

[0208] Condition 1: 1.1 ≤ Last_GL_CAS1 / Last_GL_CAS2 ≤ 1.4

[0209] Under this condition, Last_GL_CAS1 means the effective diameter CAS1 of the object side surface of the last glass lens GL in the optical system, and Last_GL_CAS2 means the effective diameter CAS2 of the sensor side surface of the last glass lens GL in the optical system.

[0210] Condition 2: 2 < L3R1 / (CA31 / 2) < 5

[0211] Under Condition 2, L3R1 represents the radius of curvature of the fifth surface S5 on the object side of the third lens 123, and CA31 represents the effective diameter of the object-side surface of the third lens 123. When the biconvex third lens 123 satisfies Condition 2, the optical system 1000 can improve chromatic aberration. If the third lens 123 is less than the lower limit value of Condition 2, the aberration occurring on the fifth surface S5 increases; if the third lens 123 is greater than the upper limit value, the aberration occurring on the fifth surface decreases, but since the radius of curvature of the sixth surface must be smaller, the aberration occurring on the sixth surface increases, and there is a problem of affecting the aberrations of the fourth lens to the seventh lens. Preferably, if 3 < L3R1 / (CA31 / 2) < 4, 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, making the production of the third lens 123 easy. The aberration occurring in the optical system can be reduced, and the production of the third lens 123 can be made easier, thereby increasing the yield.

[0212] The average effective diameter of the glass material can be 10 mm or more, for example, in the range of 10 mm to 15 mm. The lens having the smallest effective diameter among the lenses made of the glass material can be placed closest to the plastic lens. In the lens portion 100B, the smallest effective diameter can be in the range of 8 mm to 10 mm, and the largest effective diameter can be in the range of 11 mm to 15 mm. When the radius of curvature is described as an absolute value, the lens surface having the smallest radius of curvature based on the optical axis OA in the lens portion 100B can be the sensor-side surface of the lens closest to the plastic lens. The lens surface having the smallest radius of curvature can be the sensor-side surface of the glass lens closest to the plastic lens. For example, in the lens portion 100B, the (n - 2)th sensor-side surface can have the smallest radius of curvature. When the lens surface having the smallest radius of curvature is the sensor side of the glass lens closest to the plastic lens, light can be refracted into the effective area of the plastic lens having a relatively small effective diameter.

[0213] Within the lens portion 100B, the lens surface having the maximum radius of curvature may be the sensor-side surface or the object-side surface of the plastic lens disposed between the glass lens and the image sensor 300. In the case of two or more plastic lenses, the lens surface having the maximum radius of curvature may be the lens surface closer to the sensor side among the plastic lenses. For example, within the lens portion 100B, the object-side surface of the n-th lens may have the maximum radius of curvature. Here, the minimum radius of curvature may be 20 or less, for example 10 or less. The maximum radius of curvature may be 10 times or more the minimum radius of curvature. When expressed in absolute value, if the average radius of curvature of the glass lens is Aver_GLr and the average radius of curvature of the plastic lens is Aver_PLr, the following condition may be satisfied: Aver_GLr < Aver_PLr. Additionally, the following condition may be satisfied: 3 < Aver_PLr / Aver_GLr < 7. The radius of curvature (absolute value) of the glass lens and the plastic lens may satisfy the following conditions: 10 < Aver_GLr < 50 and 100 < Aver_PLr < 200. Therefore, by arranging the plastic lens having a large average radius of curvature adjacent to the image sensor 300, the light distribution traveling to the image sensor 300 can be controlled.

[0214] The lens portion 100B may include at least one cemented lens 145. Here, the number of lenses having an effective diameter greater than the length of the image sensor 300 may be 4 to 5, and the number of lenses having an effective diameter less than the length of the image sensor 300 may be 2 to 3.

[0215] When the aperture stop ST is disposed on the sensor surface of the second lens, the following conditions are satisfied: 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 > the effective diameter of the sensor-side surface of the second lens (the effective diameter of the aperture stop). The following conditions are satisfied: the effective diameter of the sensor-side surface of the second lens (the effective diameter of the aperture stop) < the effective diameter of the object-side surface of the third lens < the effective diameter of the sensor-side surface of the third lens > the effective diameter of the object-side surface of the fourth lens > the effective diameter of the sensor-side surface of the fourth lens. The aperture stop may be disposed at the periphery of the object-side surface or the sensor-side surface of the lens closest to the object side among the lenses of the second lens group LG2.

[0216] In the optical system 1000 of the third embodiment, the sum of the refractive indexes of the lenses of the lens portion 100B may be 8 or more, for example, in the range of 8 to 15, and the average value of the refractive index may be in the range of 1.6 to 1.72. The sum of the Abbe numbers of each lens in the lens may be 220 or more, for example, in the range of 220 to 350, and the average value of the Abbe number may be 55 or less, for example, in the range of 31 to 55. The sum of the center thicknesses of all the lenses may be 15 mm or more, for example, in the range of 20 mm to 28 mm, and the average value of the center thickness may be in the range of 2.8 mm to 4 mm. The sum of the center spacings of the lenses at the optical axis OA may be 4.5 mm or more, for example, in the range of 4.5 mm to 9 mm, and may be less than the sum of the center thicknesses of the lenses. In addition, the average value of the effective diameter of each lens surface S1 to S14 of the lens portion 100B may be set in the range of 8 mm or more, for example, 8 mm to 15 mm. In the optical system according to the third embodiment of the present invention, the field of view and the sensor size will be described in the first embodiment.

[0217] Since the third embodiment is an optical system applied to a vehicle camera device, even if it is designed to use a plastic lens and a glass lens together, the first lens can be set to a glass material. This has the following advantages: the glass material is more scratch-resistant than the plastic material and is less sensitive to the external temperature. In order to be placed inside the vehicle or to more effectively prevent scratches caused by foreign objects, a glass lens is used as the first lens, and the object side surface of the first lens can have a concave shape so as not to contact the external structure. If the object side surface of the first lens is designed to have a convex shape, scratches may occur due to contact with the external structure. The field of view can be greater than 20 degrees and less than 40 degrees, for example, in the range of 25 degrees to 35 degrees, for driver monitoring, front / rear shooting of the vehicle, or lane detection when the vehicle is being driven and detection of objects approaching around the vehicle. The horizontal field of view can be a preset angle for an advanced driver assistance system (ADAD). The optical system 1000 according to the third embodiment may also include a reflective member (not shown) for changing the path of light. The reflective member may be implemented as a prism which reflects incident light of the first lens group LG1 toward the lens. Hereinafter, an optical system according to an embodiment will be described in detail.

[0218] Reference Figure 21 to Figure 23 , the first lens 121 may be a first lens group LG1, and the second to seventh lenses 122, 123, 124, 125, 126, and 127 may be a second lens group LG2. An aperture stop may be arranged on one of the periphery of the object side surface or the sensor side surface of the first lens 121 or the periphery of the object side surface or the sensor side surface of the second lens 122.

[0219] The first lens 121 may have a negative (-) refractive power. The first lens 121 may be made of, for example, glass. The object-side first surface S1 of the first lens 121 on the optical axis may be concave, and the sensor-side second surface S2 may be convex. The aspheric coefficients of the first surface S1 and the second surface S2 may be set to Fig.24 S1 and S2 in L1. The first lens 121 can be manufactured as a lens with an aspherical surface by injection molding a glass material. Since the first lens 121 is set to an aspherical glass material, the glass material with high transmittance and refractive index has an aspherical surface, which can reduce the number of lenses in the optical system. The optical system 1000 may include at least one, for example, 1 to 3 glass lenses with aspherical surfaces. The effective radius r11 of the first lens 121 may be greater than the effective radius of the plastic lens. Since the first surface S1 is concave and the second surface S2 is convex, the incident light can be refracted in a direction away from the optical axis OA, and the distance between the first lens 121 and the second lens 122 can be reduced. The first surface S1 of the first lens 121 can be set to have no 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 121 can be set to have no critical point.

[0220] The second lens 122 may have a positive (+) refractive power. The second lens 122 may be provided using a glass material. The object-side third surface S3 of the second lens 122 on the optical axis OA may be concave, and the sensor-side fourth surface S4 may be convex. The second lens 122 may be provided using a spherical lens made of glass. The third lens 123 may have a positive (+) refractive power. The third lens 123 may be provided using a glass material. The object-side fifth surface S5 of the third lens 123 on the optical axis may be convex, and the sensor-side sixth surface S6 may be convex. The third lens 123 may be provided as a spherical lens made of glass.

[0221] An aperture stop may be arranged around the sensor-side fourth surface S4 of the second lens 122. Since the third lens 123 adjacent to the sensor side of the aperture stop has a positive refractive power (F3>0), the third lens 123 may refract the incident light in the direction of the optical axis, and an increase in the effective diameter of the sensor-side lens or the rear-side lens of the third lens 123 may be suppressed. Therefore, it is possible to prevent the optical system weight yield from being reduced due to the third lens 123, and to improve production efficiency. Here, the composite focal length of the third lens 123 to the seventh lens 127 arranged on the sensor side of the aperture stop may have a positive value, and the TTL within the field of view may be reduced.

[0222] The fourth lens 124 may have a positive (+) refractive power. The fourth lens 124 may be provided using a glass material. The seventh surface S7 of the object side of the fourth lens 124 on the optical axis may be convex, and the eighth surface S8 of the sensor side may be concave. The fourth lens 124 may have a convex shape on both sides. The fourth lens 124 may be provided using a spherical lens made of glass. The fifth lens 125 may have a negative (-) refractive power. The fifth lens 125 may be provided using a glass material. On the optical axis OA, the ninth surface of the fifth lens 125 on the object side may be concave, and the tenth surface S10 on the sensor side may be concave. Both the ninth surface and the tenth surface S10 may be spherical.

[0223] The bonding surface between the fourth lens 124 and the fifth lens 125 may be defined as an eighth surface S8. The composite refractive power of the fourth lens 124 and the fifth lens 125 may have a positive refractive power. The product of the refractive power of the fourth lens 124 on the object side of the cemented lens 145 and the refractive power of the fifth lens 125 on the sensor side may be less than 0. The composite refractive power of the cemented lens 145 has a positive refractive power, and the third lens 123 on the object side and the sixth lens 126 on the sensor side may have a positive refractive power based on the cemented lens 145. Therefore, the third lens 123, the cemented lens 145, and the sixth lens 126 may refract some of the incident light in the direction of the optical axis.

[0224] The effective diameter of the fourth lens 124 may be greater than the diagonal length of the image sensor 300. The effective diameter of the fourth lens 124 is an average of the effective diameters of the seventh surface S7 and the eighth surface S8, and may be greater than the diagonal length of the image sensor 300. The effective diameter of the fifth lens 125 may be smaller than the effective diameter of the fourth lens 124, and have a length within the range of ±110% or ±125% of the diagonal length of the image sensor 300. When the fifth lens 125 is a glass lens and the sixth lens 126 and the seventh lens 127 are plastic lenses, the effective diameter CA difference between the object-side ninth surface of the fifth lens 125 and the sensor-side tenth surface S10 may be set to be the maximum. For example, when the effective diameters of the object-side surface and the sensor-side surface of the fifth lens 125 are CA51 and CA52, CA51>CA52 is satisfied, and the difference between CA51 and CA52 may be the largest among the effective diameter differences between the object-side surface and the sensor-side surface of the lens. Therefore, the difference in effective diameter of the lens closest to the plastic lens, that is, the fifth lens 125, can be set to be the largest, so as to effectively guide light to travel to the plastic lens having a relatively small effective diameter. The effective diameter of the fifth lens 125 can satisfy the following conditions: 1.1 <CA51 / CA52<1.5。

[0225] The cemented lens 145 is formed by bonding glass lenses having different refractive indices and has a spherical refractive surface. When the lens located on the sensor side compared to the cemented lens 145 is an aspherical lens or a plastic lens, spherical aberration can be compensated. In addition, since the lens located on the sensor side compared to the cemented lens 145 is a plastic lens and is arranged as a lens with a small effective diameter, light traveling to the image sensor 300 through the plastic lens can be set to be effectively guided. Since the cemented lens 145 is located on the object side or between two consecutive lenses among the first lens to the fourth lens compared to the plastic lens, chromatic aberration correction can be more efficient.

[0226] The sixth lens 126 may have a positive (+) refractive power. The sixth lens 126 may be provided using a plastic material. On the optical axis OA of the sixth lens 126, the object-side eleventh surface S11 may be a convex shape and the sensor-side eleventh surface S12 may be a protruding shape. The sixth lens 126 may have a shape in which both sides are convex on the optical axis OA. The eleventh surface S11 and the twelfth surface S12 may be aspherical surfaces. The aspherical coefficients of the eleventh surface S11 and the twelfth surface S12 may be set to Fig.24 The eleventh surface S11 and the twelfth surface S12 of the sixth lens 126 may be arranged to have no critical point from the optical axis OA to the end of the effective area. When the twelfth surface S12 has a critical point, the critical point may be located at 70% or more of the effective radius r62 from the optical axis OA, or may be located in the range of 70% to 90%, or in the range of 75% to 85%.

[0227] The seventh lens 127 may have a negative (-) refractive power. The seventh lens (127) may be made of a plastic material. The object-side thirteenth surface S13 of the seventh lens 127 on the optical axis may be convex, and the sensor-side fourteenth surface S14 may be concave. The seventh lens 127 may have a meniscus shape convex toward the object side. The thirteenth surface S13 and the fourteenth surface S14 may be aspherical surfaces. The aspherical coefficients of the thirteenth surface S13 and the fourteenth surface S14 may be set to Fig.24 The seventh lens 127 may be a plastic lens closest to the image sensor 300 .

[0228] Reference Fig. 22, the thirteenth surface S13 of the seventh lens 127 may have at least one critical point from the optical axis OA to the end of the effective area. The critical point of the thirteenth surface S13 may be located at 50% or less of the effective radius from the optical axis OA, or in a range of 0.1% to 30%, or in a range of 0.1% to 20%. The critical point of the thirteenth surface S13 may be located at a position of 2 mm or less from the optical axis OA, for example, in a range of 0.1mm to 2mm, or in a range of 0.1mm to 1mm. As another example, the thirteenth surface S13 may be set to have no critical point. The fourteenth surface S14 of the seventh lens 127 may have at least one critical point P2 from the optical axis OA to the end of the effective area. The critical point P2 of the fourteenth surface S14 may be located at a distance r7x of 44% or more of the effective radius r72 from the optical axis OA, or in a range of 44% to 64%, or in a range of 49% to 59%. The critical point P2 of the fourteenth surface S14 may be located at a position 2.1 mm or more from the optical axis OA, for example, in the range of 2.1 mm to 3 mm.

[0229] A tangent line K3 passing through any point of the fourteenth surface S14 of the seventh lens 127 and a normal line K4 perpendicular to the tangent line K3 may form a predetermined angle θ2 with the optical axis OA. A maximum tangent angle θ2 of the fourteenth surface S14 in the first direction X may be 45 degrees or less, for example, in the range of 5 to 43 degrees or 13 to 33 degrees.

[0230] Fig.23 yes Fig.21 An example of lens data of the optical system of the third embodiment. Fig.23 As shown, when expressed as an absolute value of the radius of curvature, the radius of curvature of the thirteenth surface S13 of the seventh lens 127 on the optical axis OA may be the largest among the lenses, and the radius of curvature of the tenth surface S10 of the fifth lens 125 may be the smallest among the lenses. The difference between the maximum radius of curvature and the minimum radius of curvature may be 30 times or more, for example, 50 times or more. The radius of curvature of the sixth lens 126 and the seventh lens 127 of the plastic material may be greater than the radius of curvature of the first lens to the fifth lens 121, 122, 123, 124 and 125 of the glass material. Here, the radius of curvature is the average value of the radius of curvature (absolute value) of the object side surface and the sensor side surface of each lens.

[0231] In terms of the center thickness (CT) of the lens, the center thickness of the second lens 122 and the fourth lens 124 may be greater than the center thickness of the plastic lens. For example, the center thickness of at least two or more of the glass material lenses may be greater than the center thickness of the plastic lens. The center thickness of each of the sixth lens 126 and the seventh lens 127 may be less than the center thickness of each of the first lens 121 to the fourth lens 124. The center thickness of the second lens 122 or the third lens 123 is the largest among the lenses, and the center thickness of the seventh lens 127 is the smallest among the lenses. The difference between the maximum center thickness and the minimum center thickness may be 2 mm or more. That is, even if the plastic material lens provides a thin center thickness, the optical performance will not deteriorate, and the thickness of the camera module can be set to be thin.

[0232] When explaining the center distance CG between the lenses, the center distance between the first lens 121 and the second lens 122 is the maximum and is greater than the distance between the plastic lenses. The center distance between the third lens 123 and the fourth lens 124 is the minimum and can be less than the gap between the plastic lenses. Here, the minimum center distance does not include the bonding surface of the cemented lens 145. The difference between the maximum center distance and the minimum center distance can be 1.5 mm or more, for example, in the range of 1.5 mm to 2.5 mm. In addition, by setting the maximum center distance between the lenses to 80% or less of the maximum center distance, for example, in the range of 50% to 80%, a plastic lens with a thin thickness is applied without increasing the center distance compared to the center thickness of each lens, and the thickness of the camera module can be not increased.

[0233] Regarding the effective diameter, the lens with the largest effective diameter may be disposed between the first lens 121 closest to the object and the seventh lens 127 closest to the image sensor 300. The lens with the largest effective diameter may be a glass lens. The lens with the largest effective diameter may be disposed between the first lens 121 closest to the object and the plastic lens. The lens with the largest effective diameter may be disposed between the glass lenses and may be, for example, the third lens. Here, the effective diameter is the average of the effective diameter of the object-side surface and the effective diameter of the sensor-side surface of each lens. The effective diameter of a lens made of glass may be larger than the effective diameter of a lens made of plastic. For example, the effective diameters of the first to fifth lenses 121 to 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 to 125 may be larger than the diagonal length of the image sensor 300. The average effective diameters of the sixth and seventh lenses 126 and 127 may be smaller than the diagonal length of the image sensor 300. Therefore, the plastic lens may guide light incident through the glass lens to the image sensor 300. Here, an average value of the center thicknesses of the first to seventh lenses 121 to 127 may be greater than a center thickness of each of the plastic lenses, such as the sixth lens 126 and the seventh lens 127. An average effective diameter of the first to seventh lenses 121 to 127 may be greater than an effective diameter of each of the plastic lenses, such as the sixth lens 126 and the seventh lens 127.

[0234] In terms of refractive index, the refractive index of the first lens 121 is the largest among the lenses and may be 1.75 or more. The refractive index of the sixth lens 126 is the smallest among the lenses. The difference between the maximum refractive index and the minimum refractive index may be 0.23 or more. By making the refractive index of the lens closest to the object the largest and setting the refractive index of the sixth lens 126 made of a plastic material closest to the glass material lens to the smallest, the incident efficiency is improved, and the refractive power between the glass material lens and the plastic material lens may be adjusted to guide light to the image sensor 300. In terms of Abbe number, the Abbe number of the second lens 122 is the largest among the lenses and may be 65 or more. The Abbe number of the seventh lens 127 is the smallest among the lenses. The difference between the maximum refractive power and the minimum Abbe number may be 45 or more. By maximizing the Abbe number of the lens adjacent to the aperture stop and setting the Abbe number of the seventh lens 127 made of plastic material closest to the image sensor to a minimum, the dispersion of light traveling between the glass lenses can be controlled and the dispersion between the glass lenses and the plastic lenses can be increased to guide the light to the image sensor 300.

[0235] The focal lengths F1, F5, and F7 of the first lens 121, the fifth lens 125, and the seventh lens 127 may have negative refractive power, and the focal lengths F2, F3, F4, and F6 of the second lens 122, the third lens 123, the fourth lens 124, and the sixth lens 126 may have positive refractive power. Here, among the plastic lenses, the sixth lens 126 has positive refractive power, and the seventh lens 127 has negative refractive power. Therefore, according to conditions 1 and 2, the refractive index of the sixth lens 126 is smaller than the refractive index of the seventh lens 127, and the dispersion value of the sixth lens 126 is greater than the dispersion value of the seventh lens 127. Chromatic aberration occurring in the plastic lens may be corrected by the plastic lens. In addition, by satisfying that the refractive index difference between the sixth lens 126 and the seventh lens 127 as plastic lenses arranged in series is 0.1 or more and 0.15 or less and the Abbe number difference is 20 or more and 60 or less, the chromatic aberration occurring in the plastic lens may be compensated by the plastic lens.

[0236] The optical system 1000 causes chromatic aberration, and the chromatic aberration is corrected by using a cemented lens 145 or two lenses arranged in series. When the temperature changes from low to high, the lens repeatedly contracts and expands. Since the lens characteristics of the lenses of the same material change by the same amount according to the temperature change, it is effective to correct the chromatic aberration between the lenses of the same material even when the temperature changes. Therefore, in the third embodiment of the present invention, the chromatic aberration occurring in the glass material lens can be mutually corrected by the fourth lens 124 and the sixth lens 125, and the chromatic aberration occurring in the plastic lens can be mutually corrected by using the sixth lens 126 and the seventh lens 127. The refractive index difference between the fourth lens 124 and the fifth lens 125 as cemented lenses is 0.1 or more and 0.15 or less and the Abbe number difference is 20 or more and 60 or less, and the chromatic aberration occurring in the plastic lens can be compensated by the plastic lens. In addition, by arranging a glass lens with a relatively high Abbe number on the object side of the plastic lens, the dispersion of the glass lens can be reduced, and the dispersion of the plastic lens can be increased.

[0237] When the focal length is expressed as an absolute value, the focal length of the first lens 121 is the largest among the lenses and may be 55 or more. The focal length of the fifth lens 125 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length may be 50 or more. By maximizing the focal length of the lens closest to the object and setting the focal length of the glass lens 125 adjacent to the plastic lens to the minimum, it is possible to have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set field of view in the optical system, and to have good optical performance at the periphery of the field of view.

[0238] The sensor side surface of the seventh lens 127 has a critical point. The critical point is a point where the trend of the sag value changes. That is, the critical point is a point where the sag value increases and then decreases, or a point where the sag value decreases and then increases. Figure 6 , it can be seen that the critical point of the sensor-side surface of the seventh lens 127 exists between a point spaced 2.1 mm from the optical axis in the direction perpendicular to the optical axis and a point spaced 2.9 mm from the optical axis. For example, the sag value of the sensor-side surface of the seventh lens 127 increases to a point of 2.5 mm±0.4 mm in the direction perpendicular to the optical axis, and then decreases from the point of 2.5 mm±0.4 mm toward the edge in the direction perpendicular to the optical axis. If a critical point exists on the sensor-side surface of the seventh lens 127, that is, the sensor-side surface of the last lens, that is, the lens surface closest to the sensor, TTL can be reduced, thereby making it easy to miniaturize and lighten the optical system.

[0239] like Fig.24 As shown, among the lenses of the lens section 100B in the third embodiment, the lens surfaces of the first lens 121, the sixth lens 126, and the seventh lens 127 may include aspherical surfaces having a 30th-order aspherical coefficient. Fig.25 As shown, the thicknesses T1 to T7 of the first lens 121 to the seventh lens 127 and the distances G1 to G6 between two adjacent lenses can be expressed at intervals of 0.1 mm or 0.2 mm or more in the Y-axis direction based on the optical axis. The thickness T1 of the first lens 121 can be 1 or more times the difference between the maximum thickness and the minimum thickness, for example, 1 to 1.5 times, and the center thickness can be the minimum and the edge thickness can be the maximum. The thickness T2 of the second lens 122 can be 1 or more times the maximum thickness greater than the minimum thickness, for example, 1 to 1.5 times. The center of the second lens 122 can have the maximum thickness, and the edge can have the minimum thickness. The thickness T3 of the third lens 123 can be the maximum at the center and the minimum at the edge. The center thickness of the third lens 123 can be the thickest among the centers of the lenses. The maximum thickness of the fourth lens 124 can be 1.2 times or more of the minimum thickness, for example, in the range of 1.2 to 1.8 times, and can be less than the difference between the maximum thickness and the minimum thickness of the fifth lens 125. The maximum thickness of the fifth lens 125 may be at the edge and the minimum thickness may be at the center, and the maximum thickness may be 1.2 times or more of the minimum thickness, for example, in the range of 1.2 times to 1.8 times.

[0240] The center thickness CT45 of the cemented lens 145 may be greater than the edge thickness ET45. The center thickness CT45 of the cemented lens 145 is the distance from the center of the object-side seventh surface S7 of the fourth lens 124 to the center of the tenth surface S10 of the fifth lens 125, and 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 cemented lens 146 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.

[0241] The sixth lens 126 has a maximum thickness at the center, a minimum thickness at the edge, and the maximum thickness is at least 1 times the minimum thickness, for example, in the range of 1 to 1.5 times. The seventh lens 127 has a maximum thickness at the edge, a minimum thickness at the center, and the maximum thickness is at least 1 times the minimum thickness, for example, in the range of 1 to 1.5 times. Among the distances G1 to G6 between the lenses, the fourth distance G3 between the third lens 123 and the fourth lens 124 may have a maximum value at the edge and a minimum value at the center, and the difference between the maximum distance and the minimum distance may be the largest among the above distances, and may be at least 5 times, for example, in the range of 5 to 10 times. Among the distances G1 to G6 between the lenses, the first distance G1 between the first lens 121 and the second lens 122 may have the minimum difference between the maximum distance and the minimum distance among the distances G1 to G6. That is, the difference between the maximum distance and the minimum distance of the first distance G1 may be 1.10 or less.

[0242] like Fig.26 As shown, Fig.21 The CRA in the optical system and camera module may be 10 degrees or greater, for example, in the range of 10 degrees to 35 degrees or in the range of 10 degrees to 25 degrees. Fig.33 As shown, in the optical system according to the third embodiment, the graph showing the relative illumination according to the image height shows that the relative illumination from the center to the diagonal end of the image sensor is 70% or more, for example, 75% or more. That is, it can be seen that the difference in relative illumination according to temperature (zoom positions 1, 2, 3) is almost the same within a range of a maximum of 4.4 mm from the optical axis.

[0243] Figure 27 to Figure 29 It is shown in Fig.21 Graphs of diffraction MTF at room temperature, low temperature, and high temperature in an optical system of FIG. 1 and FIG. 2 are graphs showing modulation according to spatial frequency. Figures 7 to 29 As shown, in the third embodiment of the present invention, the deviation of the MTF at a low temperature or a high temperature relative to the room temperature may be less than 10%, that is, 7% or less.

[0244] Figure 30 to Figure 32 It is shown Fig.21 Curve diagram of aberration characteristics in an optical system at room temperature, low temperature, and high temperature. Figure 30 to Figure 32 The aberration diagrams of the image are shown from left to right for measuring spherical aberration (longitudinal spherical aberration), astigmatism field curve, and distortion. Figure 30 to Figure 32 In the aberration diagram, 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. It can be seen that the optical system 1000 according to the third embodiment has measurement values ​​close to the Y-axis in almost all areas. That is, the optical system 1000 according to the embodiment has improved resolution and can have good optical performance not only in the central part of the FOV but also in the peripheral part. Here, the low temperature is -20 degrees or lower, for example, in the range of -20 degrees to -40 degrees, the room temperature is in the range of 22 degrees ±5 degrees or in the range of 18 degrees to 27 degrees, and the high temperature can be in the range of 85 degrees or higher, for example, in the range of 85 degrees to 105 degrees. Therefore, it can be seen that Figure 30 to Figure 32 The decrease in brightness ratio (modulation) from low temperature to high temperature is less than 10%, for example, 5% or less, or hardly changes.

[0245] Table 2 compares the 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 third embodiment, and it can be seen that the rate of change of the optical properties at low temperature is 5% or less, for example, 3% or less, relative to room temperature, and it can be seen that the rate of change of the optical properties at low temperature is 5% or less, for example, 3% or less, relative to room temperature.

[0246] [Table 2]

[0247] Room temperature Low temperature high temperature Low temperature / room temperature High temperature / room temperature EFL(F) 15.000 14.961 15.048 99.74％ 100.58％ BFL 2.500 2.497 2.503 99.88％ 100.25％ F# 1.600 1.596 1.605 99.73％ 100.61％ TTL 34.875 34.833 34.926 99.88％ 100.27％ FOV 34.168 34.273 34.044 100.31％ 99.33％

[0248] Therefore, as shown in Table 2, the change in optical characteristics according to the temperature change from low temperature to high temperature, for example, the change rate of EFL, TTL, BFL, F number, and the change rate of FOV are 10% or less, that is, 5% or less, for example, within the range of 0 to 5%. This can prevent the reliability of optical characteristics from being deteriorated by designing so that temperature compensation of plastic lenses is possible even when at least one or two or more plastic lenses are used.

[0249] The optical system 1000 according to the embodiments disclosed above may satisfy at least one or two or more of the mathematical formulas described below. Accordingly, the optical system 1000 according to the embodiments may have improved optical characteristics. For example, when the optical system 1000 satisfies at least one mathematical formula, the optical system 1000 may effectively control aberration characteristics such as chromatic aberration and distortion aberration, and may have good optical performance not only in the central portion but also in the peripheral portion of the FOV. In addition, the optical system 1000 may also have improved resolution. In addition, the thickness of the lens on the optical axis OA and the spacing between adjacent lenses on the optical axis OA described in the formulas may be referred to the above embodiments.

[0250] [Equation 1] 0 < CT1 / CT2 < 9

[0251] In Equation 1, CT1 means the central thickness of the first lenses 101, 111, and 121, and CT2 means the central thickness of the second lenses 102, 112, and 122. Equation 1 may improve the chromatic aberration of the optical system by setting the difference in the central thicknesses of the first lens and the second lens. Equation 1 may satisfy: 5 < CT1 / CT2 < 8. By increasing the thicknesses of the first lenses 101, 111, and 121 made of glass, changes in optical characteristics due to temperature variations may be suppressed, and the optical performance of the central portion and the peripheral portion of the FOV may be improved.

[0252] [Equation 2] (CT7 * CA7) < (CT1 * CA1)

[0253] CT7 is the central thickness of the seventh lenses 107, 117, and 127, CA1 is the effective diameter of the first lenses 101, 111, and 121, and CA7 is the effective diameter of the seventh lens. The effective diameter is the average of the effective diameters of the object side surface and the sensor side surface of each lens. Preferably, the following conditions may be satisfied: CT7 < CT1 and CA7 < CA1. By setting the central thicknesses and effective diameters of the glass lens and the plastic lens, the optical system may improve spherical aberration, and a thin imaging device module may be provided.

[0254] [Equation 3] Po1 < 0

[0255] In Equation 3, Po1 means the power of the first lenses 101, 111, and 121, and may be set to have a short effective focal length F compared to the 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 of the effective focal length F, for example, 1.5 times to 3 times.

[0256] [Equation 4] 1.70 < Nd5 < 2.2

[0257] Nd5 is the refractive index of the d-line of the fifth lens 105, 115 and 125. Formula 4 sets the refractive index of the fifth lens high so that it can control the factors affecting the reduction of the third-order aberration (Seidel aberration) of the optical system, and can reduce the aberration that may occur when the TTL becomes slightly longer. Formula 4 preferably satisfies: 1.75≤Nd5<2.0. If it is designed to be lower than the lower limit of Formula 4, the aberration can be reduced to obtain performance, and the refractive power of the fifth lens may be weakened, making it impossible to collect light efficiently, which may deteriorate the performance of the optical system. If it is designed to be higher than the upper limit of Formula 4, there is a disadvantage that it becomes difficult to obtain the material. In addition, if the refractive index of the fifth lens 105, 115 and 125 is designed to be lower than the lower limit of Formula 4, in order to increase the refractive power of the sixth lens and the seventh lens, the radius of curvature of the sixth lens and the seventh lens must be increased. In this case, lens manufacturing becomes more difficult, the lens defect rate may increase, and the yield may decrease.

[0258] [Formula 4-1]1.60≤Aver(Nd1:Nd7)≤1.70

[0259] In Formula 4-1, Aver(Nd1:Nd7) is an average of the refractive index values ​​of the d-line of the first to seventh lenses. When the optical system 1000 according to the embodiment satisfies Formula 4-1, the optical system 1000 can set the resolution and suppress the influence on TTL.

[0260] [Formula 4-2] 1.0 <SSL_Nd_Aver / ASL_Nd_Aver<1.5

[0261] SSL_Nd_Aver is the average value of the refractive index of the spherical lenses in the lens parts 100, 100A and 100B, and ASL_Nd_Aver is the average value of the refractive index of the aspherical lenses. The aspherical lenses are located on the sensor side of the glass lenses having a high refractive index, thereby increasing dispersion.

[0262] [Formula 4-3] 1.60≤Nd1<1.90

[0263] Nd1 is the refractive index of the d-line of the first lenses 101, 111, and 121. Equation 4-3 can increase dispersion by setting the refractive index of the first lenses high.

[0264] [Formula 5] 20 <FOV_H<40

[0265] In Equation 5, FOV_H refers to the horizontal field of view and can set the range of the vehicle optical system. Equation 5 preferably satisfies: 25 ≤ FOV_H ≤ 35 or a 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, if Equation 5 is satisfied, when the temperature changes from room temperature to a high temperature, the change rate of the effective focal length and the change rate of the field of view can be set to 5% or less, for example, 0 to 5%. Further, even when one or more aspherical lenses, such as two or more aspherical lenses, are combined with spherical lenses in the optical system 1000, the deterioration of optical characteristics can be prevented by temperature compensation of the glass lens. Here, when the vertical field of view is FOV_V, the following condition can be satisfied: 10 < FOV_V < FOV_H.

[0266] [Equation 6] L1R1 < 0

[0267] L1R1 refers to the radius of curvature of the optical axis of the first surface S1 of the first lens 101 and can be set to be less than 0. If Equation 6 is satisfied, the shape of the optical system can be restricted. The object side surface of the first lens 101 is formed to be recessed from the optical axis so that when it comes into contact with an external structure, surface damage can be prevented and the incident light can be refracted away from the optical axis. Additionally, the following condition can be satisfied: L1R1 * L1R2 > 0. Therefore, the center thickness and edge thickness of the first lenses 101, 111, and 121 can be increased, and the distance between the first lenses 101, 111, and 121 and the second lenses 102, 112, and 122 can be decreased.

[0268] [Equation 7] 0.8 < BFL / L7S2_max_sag to the sensor < 3

[0269] The L7S2_max_sag to the sensor can be the distance from the maximum Sag value of the seventh lens 107 to the image sensor 300 in the optical axis direction. When the optical system satisfies Equation 7, the TTL can be reduced and the conditions for manufacturing the imaging device module can be set. In addition, the L7S2_max_sag to the sensor can set the following space: in this space, the filter 500 and the cover glass 400 located between the image sensor 300 and the seventh lenses 107, 117, and 127 can be set. When the range of Equation 7 is less than the lower limit, the space for placing circuit structures such as filters and image sensors becomes more restricted, and the process of assembling circuit structures such as filters and image sensors into the optical system becomes difficult. When the range of Equation 7 is greater 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 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 surface of the last lens. Specifically, if 2 < BFL / L7S2_max_sag to the sensor < 3, the manufacturing convenience and the reduction of TTL are easier.

[0270] [Equation 8]

[0271] 1 < CT1 / CT7 < 15

[0272] If Equation 8 is satisfied, the aberration characteristics can be improved and the influence on the reduction of the optical system can be set. In Equation 8, the first embodiment and the second embodiment can satisfy: 5 < CT1 / CT7 < 12, and the third embodiment can satisfy: 0.5 < CT1 / CT7 < 2.5. Equation 8 can set the center thicknesses of the first lens having a spherical or aspherical surface and the seventh lens having an aspherical surface, and can limit the difference in their center thicknesses. Therefore, the chromatic aberration of the optical system can be improved, good optical performance can be achieved at the set field of view, and the TTL (total track length) can be controlled.

[0273] [Equation 8-1] 0.1 < CT1 / CA11 < 1.2

[0274] In Equation 2, the central thickness CT1 of the first lenses 101, 111, 121 and the effective diameter CA11 of the object-side surface S1 of the first lens 101 can be set, and if this is satisfied, deterioration of the strength and optical characteristics of the glass lens can be prevented. If it is below the range of Equation 1, the lens may be damaged or difficult to process, and if it is greater than this range, the TTL may increase and the weight of the optical system may become heavier. Preferably, the first embodiment and the second embodiment satisfy: 0.6 < CT1 / CA11 < 1, and the third embodiment can satisfy: 0.1 < CT1 / CA11 < 0.5.

[0275] [Equation 9] 0 < CT1 / CT6 < 3

[0276] CT6 means the central thickness of the sixth lens 106. When the optical system satisfies Equation 9, the aberration characteristics can be improved, and the influence on the reduction of the optical system can be set. In Equation 9, the first embodiment and the second embodiment can satisfy: 1.5 < CT1 / CT6 < 2.2, and the third embodiment can satisfy: 0 < CT1 / CT6 < 2. Equation 9 sets the difference in the central thicknesses of the first lens and the sixth lens so that the chromatic aberration of the optical system can be improved.

[0277] [Equation 10] 0 < CT45 / CT6 < 1

[0278] In Equation 10, CT45 is the central thickness of the fourth lens and the fifth lens, for example, the central thickness of the cemented lens 145. That is, CT45 is the optical axis distance from the center of the object-side surface of the fourth lenses 104 and 114 to the center of the sensor-side surface of the fifth lenses 105, 115 and 125. When the optical system satisfies Equation 10, the thicknesses of the cemented lens and the adjacent sixth lenses 106, 116 and 126 can be set to improve the aberration characteristics, and preferably, the first embodiment and the second embodiment can satisfy: 0.5 < CT45 / CT6 < 1, and the third embodiment can preferably satisfy 1 < CT45 / CT6 < 4 or 2 < CT45 / CT6 ≤ 3.5. Here, the following condition can be satisfied: CT45 > ET45, and ET45 is the edge thickness of the cemented lens.

[0279] [Equation 11] 0 < |L2R1 / L4R2| < 1

[0280] In Equation 11, L2R1 means the radius of curvature of the first surface S1 of the second lenses 102, 112 and 122, and L4R2 means the radius of curvature of the eighth surface S8 of the fourth lenses 104 and 114. When the optical system 1000 according to the embodiment satisfies Equation 11, the optical system 1000 can have improved aberration characteristics.

[0281] [Equation 12] 0 < CT45 - ET45 < 2 mm

[0282] In Equation 12, ET45 is the optical axis distance from the end of the effective area of the object side surface of the fourth lenses 104, 114, and 124 to the end of the effective area of the sensor side surface of the fifth lenses 105, 115, and 125. When the optical system satisfies Equation 12, the center thickness and edge thickness of the cemented lens can be set to improve the aberration characteristics, and preferably, 1 mm ≤ CT45 / ET45 < 1.5 mm can be satisfied. ET45 can be greater than the edge thicknesses ET1 to ET7 of each of the second lens to the seventh lens.

[0283] [Equation 13] 0 < CA11 / CA31 < 2

[0284] In Equation 13, CA11 means the effective diameter of the first surface S1 of the first lenses 101, 111, and 121, and CA31 means the effective diameter of the fifth surface S5 of the third lenses 103 and 113. When Equation 13 is satisfied, the optical system 1000 can control the incident light and set the factors affecting the aberration. Preferably, the first embodiment and the second embodiment can satisfy: 1 < CA11 / CA31 < 1.5, and the third embodiment can satisfy: 0.5 < CA11 / CA31 < 1.5.

[0285] [Equation 14] 0 < CA72 / CA42 < 2

[0286] In Equation 14, CA42 means the effective diameter of the eighth surface S8 of the fourth lenses 104, 114, and 124, and CA72 means the effective diameter of the fourteenth surface S14 of the seventh lenses 107, 117, and 127. When Equation 14 is satisfied, the optical system 1000 can control the incident light path and set the elements for performance changes according to CRA and temperature. Preferably, the first embodiment and the second embodiment can satisfy: 0.5 < CA72 / CA42 < 1.0, and the third embodiment can satisfy: 0.5 < CA72 / CA42 < 1.0.

[0287] [Equation 15] 0 < CA12 / CA21 < 2

[0288] In Equation 15, CA12 means the effective diameter of the second surface S2 of the first lenses 101, 111, and 121, and CA21 means the effective diameter of the third surface S3 of the second lenses 102, 112, and 122. When the optical system 1000 according to the embodiment satisfies Equation 15, the optical system 1000 can control the light traveling to the first lens group LG1 and the second lens group LG2, and can set the factors affecting the reduction of lens sensitivity. The first embodiment and the second embodiment can satisfy: 1 ≤ CA12 / CA21 < 1.5, and the third embodiment can satisfy: 0.5 < CA12 / CA21 < 1.5.

[0289] [Equation 16] 1 < CA1 / CA6 < 2

[0290] CA1 means the effective diameter of the first lenses 101, 111, and 121, and CA6 means the effective diameter of the sixth lens 106. When the optical system 1000 according to the embodiment satisfies Equation 16, the size of the spherical lens can be set. The first embodiment and the second embodiment can satisfy: 1 < CA31 / CA42 < 1.7, and the third embodiment can satisfy: 1 ≤ CA41 / CA52 < 1.8.

[0291] [Equation 17] 1 < CA41 / CA52 < 2

[0292] CA42 means the effective diameter of the seventh surface S7 of the fourth lenses 104, 114, and 124, and CA52 means the effective diameter of the tenth surface S10 of the fifth lenses 105, 115, and 125. 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 surface and the sensor-side surface of the cemented lens 145. Therefore, by setting the effective diameter size of the cemented lens arranged closer to the object side than the aspherical lens, the light incident through the cemented lens can be effectively guided to the aspherical lens. The first embodiment and the second embodiment can satisfy: 1 < CA41 / CA42 < 1.6, and the third embodiment can satisfy: 1 ≤ CA41 / CA42 < 1.5.

[0293] [Equation 18] 0 < CA52 / CA61 < 2

[0294] CA61 means the eleventh surface S11 of the sixth lenses 106, 116, and 126. When the optical system 1000 according to the embodiment satisfies Equation 18, the relationship between the effective diameter of the sensor-side surface of the cemented lens 145 and the effective diameter of the object-side surface of the adjacent lens can be set. Therefore, the optical system 1000 can improve chromatic aberration and set the size and radius of curvature between the sensor-side surfaces of the cemented lens. Therefore, the effective diameter sizes of the aspherical lens and the spherical lens arranged on the object side with respect to the last lens can be set. The first embodiment and the second embodiment can satisfy: 0.5 < CA52 / CA61 < 1, and the third embodiment can satisfy: 1.1 ≤ CA51 / CA52 ≤ 1.4.

[0295] [Equation 18-1] CA41 > (ImgH * 2)

[0296] [Equation 18-2] CA51 ≥ (ImgH * 2)

[0297] [Equation 18-3] CA62 < (ImgH * 2)

[0298] In Equations 18-1 to 18-3, the effective diameters of the object-side surfaces of the fifth lenses 105, 115, and 125, the effective diameters of the object-side surfaces of the fourth lenses 104, 114, and 124, and the effective diameters of the sensor-side surfaces of the sixth lenses 106, 116, and 126 can be set to the optical path of the area of the image sensor 300. In the embodiment, since the nth lens is set as an aspherical lens, the effective diameter ratio of the adjacent spherical lens and the cemented lens can satisfy Equations 18 to 18-3.

[0299] [Equation 19] 1 < SSL_CA_Aver / ASL_CA_Aver < 1.5

[0300] In Equation 19, SSL_CA_Aver means the average effective diameter of the lens with a spherical surface, and ASL_CA_Aver means the average effective diameter of the lens with an aspherical surface. In Equation 19, the effective diameter size of the aspherical lens arranged on the object side is set to be the largest so that the path of the incident light can be effectively guided. In addition, the difference between the effective diameters of the spherical lens and the aspherical lens can be set not to be large. 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.

[0301] [Equation 20] 0 < SSL_Nd_Aver / ASL_Nd_Aver < 1.60

[0302] In Equation 19, SSL_Nd_Aver is the average refractive index of the spherical material lenses, for example, the average refractive index of the first lens to the fifth lens. ASL_Nd_Aver is the average refractive index of the sixth lens and the seventh lens. Preferably, the refractive index of the spherical lens and the refractive index of the aspherical lens can be set to satisfy the following condition: 0.5 < SSL_Nd_Aver / ASL_Nd_Aver < 1.2.

[0303] The first embodiment and the second embodiment can satisfy the equation: 0 < ΣASL_Nd / ΣSSL_Nd < 0.5. ΣASL_Nd is the sum of the refractive indices of the aspherical lenses, and ΣSSL_Nd is the sum of the refractive indices of the spherical lenses. Preferably, 0.2 < ΣASL_Nd / ΣSSL_Nd < 0.4 can be satisfied. The optical system can control the resolution and dispersion by setting the difference in refractive index between the spherical lens and the aspherical lens.

[0304] [Equation 21] CA7 < (ImgH * 2)

[0305] In Equation 21, CA7 is the average effective diameter of the object side surface and the sensor side surface of the plastic lens, and CT1 is the center thickness of the first lens. Since the diagonal length of the image sensor satisfies Equation 21, a thin imaging device module can be provided. The first embodiment and the second embodiment can satisfy: (ImgH * 2) < CT1.

[0306] [Equation 22] 0 < CT7 / CG6 < 3

[0307] 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, the center thickness CT7 of the seventh lens 107 and the center distance between the sixth lens and the seventh lens can be set to improve the optical performance at the peripheral part of the field of view. The first embodiment and the second embodiment can satisfy: 0 < CT7 / CG6 < 1 or 0.5 < CT7 / CG6 < 1, and the third embodiment can satisfy: 1 < CT7 / CG6 < 3 or 1.1 < CT7 / CG6 < 2.

[0308] The first embodiment and the second embodiment satisfy Condition 1: (CT2 + CT3 + CT4) < CT1, and in Condition 1, the center thickness of the first lens can be greater than the sum of the center thicknesses of three adjacent lenses. Additionally, the following conditions can be satisfied: (CT3 + CT4 + CT5) < CT1, (CT4 + CT5 + CT6) < CT1, and (CT5 + CT6 + CT7) < CT1. If Condition 1 is satisfied, the center thicknesses from the first lens to the seventh lens can be set such that the optical performance of the peripheral part of the FOV can be improved.

[0309] The first embodiment and the second embodiment can satisfy Condition 1-1: G4 < 0.01 or CG4 < 0.01. In Condition 1-1, G4 and CG4 are the distance and the center distance between the fourth lens 104 and the fifth lens 105. If Equation 1-1 is satisfied, the fourth lens and the fifth lens can be set as a cemented lens.

[0310] The first embodiment and the second embodiment can satisfy Condition 2: CT3 < (CT2 * 2) < CT1 < F. Condition 2 can set the relationship between the center thicknesses of the first lens, the second lens, and the third lens and the total effective focal length F. According to Condition 2, incident light can be guided to the aspherical lens by the thickness of the object-side spherical lens, thermal compensation according to temperature changes is possible, and assembly characteristics can be improved.

[0311] The first embodiment and the second embodiment can satisfy Condition 3: (CT7 * 3) < CT1 < (CT6 * 2) < F. In Condition 3, when the center thicknesses of the first lens, the sixth lens, and the seventh lens are satisfied, due to the thickness of the sensor-side aspherical lens, the emitted light can be refracted to the entire area of the image sensor, and the TTL can be reduced.

[0312] The first embodiment and the second embodiment can satisfy Condition 4: 3 < CT6 / CT7 < 6. In Condition 4, 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, Condition 4 can be satisfied: 4 < CT6 / CT7 < 6.

[0313] [Equation 23] 0 < |F1 / F| < 20

[0314] Equation 23 can set 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. In Equation 23, the first embodiment and the second embodiment can satisfy: 1 < |F1 / F| < 5, and the third embodiment can satisfy: 1 < |F1| / F < 5.

[0315] [Equation 24] 0 < |F5 / F6| < 1

[0316] In Equation 24, the relationship between the focal length F5 of the fifth lens and the focal length F6 of the sixth lens can be set so that the refractive power and the optical path of the spherical lens and the adjacent aspherical lens can be adjusted, and the resolution can be improved. Equation 24 can be satisfied: 0 < |F5 / F6| < 0.5.

[0317] [Equation 25] 0 < |F5 / F7| < 1

[0318] In Equation 25, by setting the relationship between the focal length F5 of the fifth lens and the focal length F7 of the seventh lens, the refractive power and the optical path of the spherical lens and the last aspherical lens can be adjusted, and the resolution can be improved. Equation 25 preferably satisfies: 0 < |F5 / F7| < 0.6.

[0319] [Equation 26] 0 < |F6 / F1| < 2

[0320] In Equation 26, by setting the relationship between the focal length F1 of the first lens and the focal length F6 of the sixth lens, the refractive power and the optical path of the first spherical lens and the first aspherical lens can be adjusted, the influence of TTL can be adjusted, and the resolution can be improved. In Equation 26, the first embodiment and the second embodiment can satisfy: 0 < |F6 / F1| < 1, and the third embodiment can satisfy: 0.5 < |F6 / F1| < 1.

[0321] [Equation 27] 10 < L7R1 / CT7

[0322] L7R1 means the radius of curvature on the optical axis of the thirteenth surface of the seventh lens. In Equation 27, by setting the radius of curvature of the object-side surface of the seventh lens and the center thickness of the seventh lens, the refractive power of the seventh lens can be controlled. Therefore, good optical performance can be achieved at the central part and the peripheral part of the field of view. Preferably, in Equation 27, the first embodiment and the second embodiment can satisfy: 10 < L7R1 / CT7 < 30, and the third embodiment can satisfy: 100 < L7R1 / CT7 < 300.

[0323] [Equation 28] L5R2 / L7R1 < 1

[0324] L5R2 means the radius of curvature on the optical axis of the tenth surface of the fifth lens. 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 so that the refractive powers of the fifth lens and the seventh lens can be controlled. Therefore, good optical performance can be achieved at the central part and the peripheral part of the field of view. Preferably, in Equation 28, the first embodiment and the second embodiment can satisfy: 0 < L5R2 / L7R1 < 0.5, and the third embodiment can satisfy: 0 < L5R2 / L7R1 < 1.

[0325] [Equation 29] L1R1 * L1R2 > 0

[0326] L1R1 is the radius of curvature on the optical axis of the object-side surface of the first lens, and L1R2 is the radius of curvature on the optical axis of the sensor-side surface of the first lens. When Equation 29 is satisfied, the refractive power of the first lens is controlled to adjust the dispersion of the incident light, and the assemblability of the first lens can be improved.

[0327] [Equation 30] 0 < L5R1 / L4R2 < 2

[0328] 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 lens and the fifth lens can be expressed as a cemented lens. Preferably, L5R1 / L4R2 = 1 can be satisfied.

[0329] The third embodiment can satisfy the condition: 1 < L6R1 / L5R2 < 10 or 1 < L6R1 / L5R2 < 6. Thus, by setting the radii of curvature of the sensor-side surface of the fifth lens and the sensor-side surface of the sixth lens, light can be effectively refracted from the cemented lens toward the plastic lens. The third embodiment can satisfy the condition: |LR|_Min < PL1_R1. Here, |LR|_Min represents the minimum radius of curvature among all the lenses, and PL1_R1 means the radius of curvature of the object-side surface of the plastic lens closest to the object side. When the condition is satisfied, the plastic lens can be placed closer to the sensor than the sensor-side surface of the glass lens having the minimum radius of curvature, thereby refracting light toward the incident surface of the plastic lens.

[0330] [Equation 31] 1 < L6R2 / L6R1

[0331] 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, by setting the radii of curvature of the object-side surface and the sensor-side surface of the sixth lens, light can be refracted by the aspherical lens. In Equation 31, the first embodiment and the second embodiment can satisfy: 1.5 < L6R2 / L6R1 < 3, and the third embodiment can satisfy the conditions: 3 < L6R2 / L6R1 < 50, L6R1 > 0, L6R2 > 0, and L6R1 < L6R2. The object-side surface and the sensor-side surface of the sixth lens as a glass lens are aspherical, and when the difference in the radii of curvature of the aspherical object-side surface and the aspherical sensor-side surface satisfies the above range, the assemblability of the sixth lens can be improved, and the influence on the optical characteristics due to temperature change can be suppressed.

[0332] The first embodiment and the second embodiment satisfy [Equation 31-1] 1 < L7R1 / L7R2 < 3, where L7R1 and L7R2 denote the radii of curvature on the optical axis of the object side surface and the sensor side surface of the seventh lens. In Equation 31-1, by setting the radii of curvature of the aspherical object side surface and the aspherical sensor side surface of the plastic lens, light can be refracted by the seventh lens to the entire area of the image sensor. Therefore, when the difference between the radius of curvature of the object side surface and the sensor side surface of the seventh lens satisfies the above range, the assemblability of the seventh lens can be improved, and the influence on the optical characteristics due to temperature change can be suppressed. The third embodiment can satisfy [Equation 31-2] 1 < |L7R1 / L7R2| < 100. Equation 31-2 can satisfy: 0 < |L7R1 / L7R2| < 50. Here, the following conditions can be satisfied: L7R1 > 0, L6R1 > 0, and L7R2 < L7R1.

[0333] [Equation 32] 0 < CT_Max / CG_Max < 5

[0334] In Equation 32, the maximum center thickness CT_Max among the lenses and the maximum center distance CG_Max between adjacent lenses can be set. If Equation 32 is satisfied, the optical system can have good optical performance at the focal length in the set field of view, and the TTL can be reduced. Preferably, the first embodiment can satisfy: 0 < CT_Max / CG_Max < 0.5, and the third embodiment can satisfy: 1 < CT_Max / CG_Max < 3.

[0335] [Equation 33] 1 < ΣCT / ΣCG < 7

[0336] ΣCT is the sum of the center thicknesses of the lenses, and ΣCG is the sum of the center distances between adjacent lenses. If Equation 33 is satisfied, the optical system can have good optical performance at the focal length in the set field of view, and the TTL can be reduced. The third embodiment can satisfy: 2 < ΣCT / ΣCG < 4.5.

[0337] [Equation 34] 8 < ΣNd < 30

[0338] ΣNd means the sum of the refractive indices at the d-line of each of the multiple lenses. If Equation 34 is satisfied, the optical system 1000 in which an aspherical lens and a spherical lens are mixed can control the TTL and has improved resolution. In addition, if the number of spherical lenses is greater than the number of aspherical lenses, thermal compensation can be performed by the spherical lenses having a relatively thick thickness, and the TTL and the sum of the refractive indices of the lenses can be set. Equation 34 can preferably satisfy: 10 < ΣNd < 13.

[0339] [Equation 35] 10 < ΣVd / ΣNd < 50

[0340] ΣVd means the sum of the Abbe numbers of each lens in the plurality of lenses. If equation 35 is satisfied, the optical system 1000 may have improved aberration characteristics and resolution. Equation 35 sets the sum of the Abbe numbers of the lenses and the sum of the refractive indices to control optical characteristics, and preferably satisfies: 20<ΣVd / ΣNd<35.

[0341] [Formula 36]Distortion<2

[0342] Distortion means the maximum value or the absolute value of the maximum value of the distortion from the center (0.0F) to the diagonal end (1.0F) of the image sensor 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 the distortion characteristics and set the conditions for image processing. Preferably, Distortion<1 can be satisfied.

[0343] [Equation 37] 0<ΣCT / ΣET<2

[0344] ΣCT is the sum of the center thickness of the lens, and ΣET is the sum of the edge thickness of the ends of the effective area of ​​the lens. If equation 37 is satisfied, the optical system can have good optical performance at a focal length at a set field of view, and TTL can be reduced. In equation 37, the first and second embodiments can satisfy: 1<ΣCT / ΣET<1.5, and the third embodiment can satisfy: 0.5<ΣCT / ΣET<1.5.

[0345] [Formula 38]1 <CA11 / CA_Min<5

[0346] CA11 is the effective diameter of the object side surface of the first lens, and CA_Min represents the minimum effective diameter between the object side surface and the sensor side surface of the lens. 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 to provide a thinner module while maintaining incident light control and optical performance. Equation 38 preferably satisfies: 1 <CA11 / CA_Min<2.5。

[0347] [Formula 39]1 <CA_Max / CA_Min<5

[0348] CA_Max means the maximum effective diameter between the object side surface and the sensor side surface of the lens. If equation 39 is satisfied, the optical system can be sized for a thin and compact structure while maintaining optical performance. Equation 39 may preferably satisfy: 1.2 <CA_Max / CA_Min<2.5。

[0349] [Equation 40] 1 < CA_Max / CA_Aver < 3

[0350] CA_Aver means the average value of the effective diameters of the object side surface and the sensor side surface of the lens. If Equation 40 is satisfied, the optical system can be sized for a thin and compact structure while maintaining optical performance. Equation 40 can preferably be satisfied as: 1 < CA_Max / CA_Aver < 1.7.

[0351] [Equation 41] 0.5 < CA_Min / CA_Aver < 2

[0352] If Equation 41 is satisfied, the optical system can be sized for a thin and compact structure while maintaining optical performance. Equation 41 can preferably be satisfied as: 0.5 < CA_Min / CA_Aver < 1.

[0353] [Equation 42] 1 < CA_Max / (2 * ImgH) < 3

[0354] Equation 42 can be set by the maximum effective diameter CA_Max of the lens surface and the diagonal length of the image sensor, and if this equation is satisfied, the optical system can maintain good optical performance and be sized for a thin and compact structure. Equation 42 can preferably be satisfied as: 1 < CA_Max / (2 * ImgH) < 2.

[0355] [Equation 43] 1 < TD / CA_Max < 4

[0356] TD is the optical axis distance from the center of the object side surface of the first lens to the center of the sensor side surface of the last lens. If Equation 43 is satisfied, the total optical axis distance and the maximum effective diameter of the lens can be set such that a size for good optical performance can be set. Equation 43 preferably satisfies: 2 < TD / CA_Max < 3.

[0357] [Equation 43-1] TD > SD

[0358] SD is the distance from the position of the aperture stop to the center of the sensor side surface of the last lens.

[0359] [Equation 44] 1 < F / CA61 < 10

[0360] F means the EFL of the optical system and can be 10 mm or more, for example in the range of 10 mm to 20 mm. In Equation 44, the relationship between the effective focal length and the effective diameter of the object side surface of the first aspherical lens is set such that the influence on the reduction of the optical system such as TTL can be controlled. Equation 44 can preferably be satisfied as: 1 < F / CA61 < 2 or 1 < F / CA61 < 5.

[0361] [Equation 45] 0 < F / |L1R1| < 1

[0362] In Equation 45, the effective focal length of the optical system and the radius of curvature of the object side surface of the first lens on the optical axis can be set so that the influence on incident light and TTL can be controlled. Equation 45 can preferably satisfy: 0.3 < F / |L1R1| < 1 or 0.2 ≤ F / |L1R1| ≤ 0.85.

[0363] [Equation 46] Max(CT / ET) < 3

[0364] Max(CT / ET) means the maximum value of the ratio of the center thickness to the edge thickness of each lens. When Equation 46 is satisfied, the optical system can control the influence on the effective focal length. Equation 46 can preferably satisfy: 0.5 < Max(CT / ET) < 1. Therefore, the assemblability of all lenses can be improved.

[0365] In the third embodiment, Condition 1 is satisfied: Max_th / Min_th < 3, where Max_th is the thickness of the thickest region of the lens and Min_th is the thickness of the thinnest region of the lens. Max_th / Min_th is the ratio of the thickest thickness Max_th to the thinnest thickness Min_th of each lens. The thickest thickness Max_th of the lens can be the center thickness CT of the lens, and the thinnest thickness Min_th of the lens can be the edge thickness ET of the lens. Condition 1 can be satisfied: 1 < Max_th / Min_th ≤ 2.6. Here, the ratio of the maximum thickness to the minimum thickness of the plastic lens can satisfy the following conditions.

[0366] The following Condition 2 according to the third embodiment can be satisfied: 1.0 < Max_PL_th / Min_Pl_th < 2.5. If it is less than the lower limit of the range of Condition 2, it is difficult to manufacture the plastic lens. That is, if a high-temperature resin is injected and hardened at a low temperature to manufacture it, if the thickness difference is large, the lens may shrink unevenly when cooled at a low temperature, which may lead to a high surface defect rate. In addition, if it is greater than the ranges of Condition 1 and Condition 2, the plastic lens shrinks and expands when the temperature changes from -40 degrees to 105 degrees, and during this process, the rate of change of the lens shape appears to be large, which may deteriorate the optical performance. Preferably, the following Condition 2 can be satisfied: 1.0 < Max_PL_th / Min_Pl_th < 1.8 or 1.0 < Max_PL_th / Min_Pl_th < 1.5.

[0367] The third embodiment satisfies Condition 3: 3 < MAX(EG / CG) < 9, and MAX(EG / CG) can set the value when the ratio of the center distance CG to the edge distance EG between adjacent lenses is the maximum. Additionally, Condition 4 can be satisfied: 1 < MIN(EG / CG) < 1.5, and MIN(EG / CG) can set the value when the ratio of the center distance CG to the edge thickness EG between adjacent lenses is the minimum.

[0368] [Equation 47] 0 < EPD / |L1R1| < 1

[0369] EPD means the size (mm) of the entrance pupil diameter of the optical system 1000, and L1R1 means the radius of curvature of the first surface S1 of the first lens on the optical axis. When the optical system 1000 according to the embodiment satisfies Equation 47, the optical system 1000 can control the incident light. Equation 47 can preferably be satisfied: 0.2 < EPD / |L1R1| < 0.7 or 0 < EPD / |L1R1| ≤ 0.5.

[0370] [Equation 48] -10 < F1 / F3 < 0

[0371] F1 is the focal length of the first lens, and F3 is the focal length of the third lens. When Equation 48 is satisfied, the refractive powers of the first lens and the third lens can be controlled to improve the resolution, and the TTL and EFL can be affected. The third embodiment can satisfy: -5 < F1 / F3 < 0, and can also satisfy at least one of |F5| < F4, |F5| < F6, and |F5| < |F7|.

[0372] [Equation 49] Po4 * Po5 < 0

[0373] Po4 is the diopter value of the fourth lens, and Po5 is the diopter value of the fifth lens. That is, the refractive powers of the fourth lens and the fifth lens have opposite refractive powers, so they can improve the aberration and effectively guide the light with an aspherical lens. If the value of Po4 * Po5 is greater than 0, the effect of improving the chromatic aberration as a cemented lens does not significantly appear.

[0374] [Equation 49-1] Po1(Po4 * Po5) > 0

[0375] [Equation 49-2] F45 < 0

[0376] [Equation 49-3] F4 * F5 < 0

[0377] Po1 is the numerical value of the degree of the first lens, F45 is the combined focal length of the fourth lens and the fifth lens, F4 is the focal length of the fourth lens, and F5 is the focal length of the fifth lens. If the expressions 49-1 to 49-3 are satisfied, it is easy to use the fourth lens and the fifth lens as a cemented lens to improve the aberration of the optical system, and the incident light can be effectively guided to the aspherical lens.

[0378] [Expression 50] 15 < Vd4 - Vd5 < 50

[0379] Vd4 is the Abbe number of the fourth lens, and Vd5 is the Abbe number of the fifth lens. If the expression 50 is satisfied, the difference in the Abbe numbers of at least two lenses forming the cemented lens can be maintained above a certain value, and the chromatic aberration can be improved. The expression 50 is preferably satisfied: 20 ≤ v4 - v5 ≤ 40. If the cemented lens is less than the lower limit of the expression 50, it may be insignificant for improving the aberration characteristics of the optical system.

[0380] [Expression 51] 0 < F6 / F < 5

[0381] In the expression 51, the relationship between the focal length F6 and the effective focal length F of the sixth lens is set so that the refractive power of the first aspherical lens and the overall focal length can be adjusted to improve the resolution, and the optical system can be provided in a thin and compact size. The expression 51 can preferably be satisfied: 1 < F6 / F < 3.5 or 1 < F6 / F < 4.

[0382] [Expression 52] 0 < EPD / ImgH / FOV < 0.2

[0383] The expression 52 can set the relationship between the entrance pupil diameter (EPD), the length of 1 / 2 of the diagonal length of the image sensor (ImgH), and the diagonal field of view. Therefore, the overall size and brightness of the optical system can be controlled. The expression 52 can preferably be satisfied: 0 < EPD / ImgH / FOV < 0.1.

[0384] [Expression 53] 5 < FOV / F# < 40

[0385] The expression 53 can set the relationship between the diagonal field of view of the optical system and the F-number. Preferably, the expression 53 can be satisfied: 10 < FOV / F# < 30. Here, F# is set to 1.8 or less in order to provide a bright image.

[0386] [Expression 54] 1 < ΣSSL_CT / F# < 40

[0387] Formula 54 can set the relationship between the sum of the center thicknesses of the glass lenses of the optical system ΣSSL_CT and the F number F#. Preferably, in Formula 54, the first embodiment and the second embodiment can satisfy: 1<ΣSSL_CT / F#<20 or 10<ΣSSL_CT / F#<20. The third embodiment can satisfy: 1<ΣGL_CT / F#<10.

[0388] [Equation 55] 0<ΣPL_CT / F#<20

[0389] Equation 55 may set the relationship between the sum of the center thicknesses of the plastic lenses of the optical system ΣPL_CT and the F number F#. In Equation 83, the first and second embodiments may satisfy: 0.5<ΣPL_CT / F#<1, and the third embodiment may satisfy: 1<ΣPL_CT / F#<10.

[0390] [Equation 56] 1<ΣGL_Nd / F#<20

[0391] The relationship between the sum of the refractive indices ΣGL_Nd of the glass lenses of the optical system and the F number F# may be set in equation 84. In equation 84, the first and second embodiments may satisfy: 3<ΣGL_Nd / F#<8, and the third embodiment may satisfy: 1<ΣGL_Index / F#<10.

[0392] [Equation 57] 1<ΣPL_Nd / F#<10

[0393] The relationship between the sum of the refractive indices of the plastic lenses ΣPL_Nd and the F number F# may be set in equation 84. In equation 84, the first and second embodiments may satisfy: 1<ΣPL_Nd / F#<1.5, and the third embodiment may satisfy: 1<ΣPL_Index / F#<5.

[0394] [Equation 57]|Max_Sag62|<|Max_Sag52|

[0395] Max_Sag62 is the maximum distance from the straight line perpendicular to the optical axis on the sensor side surface of the sixth lens to the sensor side surface of the sixth lens in the optical axis direction, and Max_Sag52 is the maximum distance from the straight line perpendicular to the optical axis on the sensor side surface of the fifth lens to the sensor side surface of the fifth lens in the optical axis direction. When Formula 86 is satisfied, light can be guided from the last spherical lens to the first aspherical lens by the curvature radius of the sensor side surface of the fifth lens, and the effective diameters of the fifth lens and the sixth lens can be adjusted.

[0396] [Equation 58]|Max_Sag62|<|Max_Sag72|

[0397] Max_Sag72 is the maximum distance from the straight line perpendicular to the optical axis on the sensor side surface of the seventh lens to the sensor side surface of the seventh lens in the optical axis direction. If Equation 58 is satisfied, light can be guided from the aspherical lens to the aspherical lens through the radius of curvature of the sensor side surface of the sixth lens, and the effective diameters of the sixth lens and the seventh lens can be adjusted.

[0398] The first embodiment and the second embodiment can satisfy the condition: |Max_Sag52| < |Max_Sag41|. Max_Sag41 is the maximum distance from the straight line perpendicular to the optical axis on the object side surface of the fourth lens to the object side surface of the fourth lens in the optical axis direction. Max_Sag52 is the maximum distance from the straight line perpendicular to the optical axis on the sensor side surface of the fifth lens to the sensor side surface of the fifth lens in the optical axis direction.

[0399] The third embodiment can satisfy the following conditions.

[0400] Condition 1: 0 < |L1S1_sag_max| < 1 or 0.5 < |L1S1_sag_max| < 1

[0401] Condition 2: 0 < |L1S2_sag_max| < 1 or 0 < |L1S2_sag_max| < 0.5

[0402] Condition 3: 0 < |L2S2_sag_max| < 2 or 0.8 < |L2S2_sag_max| < 1.5

[0403] Condition 4: 1 < |L4S1_sag_max| < 3 or 1.5 < |L4S1_sag_max| < 2.0

[0404] Condition 5: 1 < |L5S2_sag_max| < 3 or 1.2 < |L5S2_sag_max| < 2.0

[0405] Conditions 1 to 5 represent the maximum Sag values of each lens surface, and when the conditions are satisfied, the separation distance from the adjacent lens surface can be set.

[0406] The first embodiment and the second embodiment can satisfy the following conditions.

[0407] Condition 1: 0 < |F37| / F12 < 3 or 0 < F37 / F12 < 1

[0408] Condition 2: 0 < F37 / F6 < 1 or 0 < F37 / F6 < 1

[0409] Condition 3: 0 < |F37 / F7| < 1 or 0 < |F37 / F7| < 0.7

[0410] Condition 4: F37 < TTL

[0411] Among Conditions 1 to 5 according to the first and second embodiments, the relationship between the combined focal length F37 of the third to seventh lenses and the combined focal length F12 of the first and second lenses or the focal length of other lenses is set, thereby controlling the refractive power of each lens and improving the resolution, and providing an optical system with a thin and small size.

[0412] [Equation 60] 1 < nGL / nASL < 4

[0413] nGL is the number of glass lenses, and nASL is the number of aspherical lenses.

[0414] [Equation 61] 1 < nGL / nPL

[0415] nGL is the number of glass lenses, and nPL means the number of plastic lenses. By arranging plastic lenses in Equation 60, the thickness of the optical system can be reduced, and a wider range of refractive power can be provided by the aspherical surfaces. The first and second embodiments can satisfy: 4 < nGL / nPL < 7, and the third embodiment can satisfy: 1 < nGL / nPL < 4.

[0416] The following condition can be satisfied: 1 < nSS / nASS < 3. nSS is the number of lens surfaces with spherical surfaces in the lens portion, and nASS is the number of lens surfaces with aspherical surfaces in the lens portion. By setting the ratio of the spherical lens surface to the aspherical lens surface under this condition, the thickness of the optical system can be reduced, and a wider range of refractive power can be provided by the aspherical surfaces.

[0417] The first and second embodiments can satisfy the condition: CA3 < CA2 < CA1, and by setting the relationship between the effective diameters CA1, CA2, and CA3 of the first, second, and third lenses, the optical paths of the lenses before and after the aperture stop can be controlled, and the optical path of the entire lens can be set. The third embodiment can satisfy the condition: CA_L2 ≤ CA_L4 < CA_L3, and the size relationship between the average effective diameters CA_L2, CA_L3, and CA_L4 of the object-side surfaces and the sensor-side surfaces of the second, third, and fourth lenses can be set.

[0418] [Equation 62]

[0419] 0 < ΣPL_CT / ΣGL_CT < 0.5

[0420] 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 overall TTL can be controlled by setting the relationship between the thickness of the aspherical lens and the thickness of the spherical lens with respect to the TTL. Equation 62 preferably satisfies 0.1 < ΣPL_CT / ΣGL_CT < 0.5.

[0421] [Equation 63]

[0422] 0 < ΣPL_Nd / ΣGL_Nd < 0.5

[0423] ΣPL_Nd is the sum of the refractive indices of the plastic lenses, and ΣGL_Nd is the sum of the refractive indices of the glass lenses.

[0424] [Equation 64] 10 mm < TTL < 50 mm

[0425] TTL (Total Track Length) refers to the distance (mm) from the center of the first surface S1 of the first lenses 101, 111, and 121 to the surface of the image sensor 300 on the optical axis OA. In Equation 64, the TTL can be set to be more than 10 mm or 20 mm to provide a vehicle optical system. Equation 64 can preferably satisfy the following conditions: 30 mm < TTL < 45 mm or TD < TTL.

[0426] [Equation 65] 2 mm < ImgH

[0427] Equation 65 can set the diagonal size (2 * ImgH) of the image sensor 300 and provide an optical system with a vehicle sensor size. Equation 65 can preferably satisfy: 4 mm ≤ ImgH.

[0428] [Equation 66] 2 mm < BFL < 7 mm

[0429] In Equation 66, the BFL (Back Focal Length) is set to be greater than 2 mm and less than 7 mm, thereby ensuring the installation space for the filter 500 and the cover glass 400, improving the assemblability of the components through the gap between the image sensor 300 and the last lens, and improving the bonding reliability. Equation 66 preferably satisfies: 2.5 mm ≤ BFL ≤ 3 mm. When the BFL is less than the range of Equation 66, some of the light traveling to the image sensor may not be transmitted to the image sensor, which can be a cause of reduced resolution. When the BFL exceeds the range of Equation 66, stray light may be introduced, which may deteriorate the aberration characteristics of the optical system.

[0430] [Equation 67] 3 < F < 40

[0431] Equation 67 can set the total effective focal length F to suit the vehicle optical system. Equation 69 can satisfy: 10 < F < 30.

[0432] [Equation 68] FOV < 45 degrees

[0433] In Formula 68, FOV means the field of view (degrees) in the diagonal direction of the optical system 1000, and a vehicle optical system of less than 45 degrees may be provided. FOV may preferably satisfy: 20≤FOV≤40.

[0434] [Formula 69]1 <TTL / CA_Max<5

[0435] CA_Max means the maximum effective diameter (mm) among the object side surface and the sensor side surface of the plurality of lenses, and TTL (total track length) means the distance (mm) from the vertex of the first surface S1 of the first lens to the upper surface of the image sensor 300 on the optical axis OA. Equation 69 can provide an improved vehicle optical system by setting a relationship between the total optical axis length and the maximum effective diameter of the optical system. Equation 69 can preferably satisfy: 1.5 <TTL / CA_Max<4。

[0436] [Formula 70]2 <TTL / ImgH<15

[0437] Equation 60 may 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 70, the optical system 1000 may have a TTL suitable for the vehicle image sensor 300, thereby providing a more improved image quality. Equation 70 may preferably satisfy: 4 <TTL / ImgH≤10。

[0438] [Equation 71] 0.1 <BFL / ImgH<2

[0439] Formula 71 can set the optical axis distance between the image sensor 300 and the last lens and the diagonal length of the optical axis of the image sensor 300. When the optical system 1000 according to the embodiment satisfies Formula 71, the optical system 1000 can ensure a BFL (back focal length) of the size of the image sensor 300 for the application vehicle, can set the distance between the last lens and the image sensor 300, and can have good optical characteristics at the center and periphery of the FOV. Formula 71 can preferably satisfy: 0.3 <BFL / ImgH<1。

[0440] [Formula 72]5 <TTL / BFL<20

[0441] Formula 72 may set the total optical axis length (TTL) of the optical system and the optical axis distance (BFL) between the image sensor 300 and the last lens (unit: mm). When the optical system 1000 according to the embodiment satisfies Formula 72, the optical system 1000 may ensure the BFL. Formula 72 may preferably satisfy 10 <TTL / BFL<20。

[0442] [Formula 73]1 <TTL / F<3

[0443] Formula 73 can set the total focal length F and the total optical axis length (TTL) of the optical system 1000. Therefore, an optical system for a driver assistance system can be provided. Formula 73 can preferably satisfy: 1.5≤TTL / F≤2.8. When the optical system 1000 according to the embodiment satisfies Formula 73, the optical system 1000 can have an appropriate focal length within the set TTL range, and an optical system that can form an image while maintaining an appropriate focal length even when the temperature changes from a low temperature to a high temperature can be provided. When it is less than the lower limit of Formula 75, it is necessary to increase the refractive power of the lens, making it difficult to correct spherical aberration or distortion aberration, and when it exceeds the upper limit of Formula 73, the effective diameter or TTL of the lens becomes longer, which may cause magnification problems of the shooting lens system.

[0444] [Formula 74]1 <F / BFL<10

[0445] Formula 74 can set the total effective focal length F of the optical system 1000 and the optical axis distance (BFL) between the image sensor 300 and the last lens. When the optical system 1000 according to the embodiment satisfies Formula 74, the optical system 1000 can have a set field of view and an appropriate focal length, and a vehicle optical system can be provided. In addition, the optical system 1000 can minimize the distance between the last lens and the image sensor 300, so that it can have good optical characteristics at the peripheral part of the FOV. Formula 74 can preferably satisfy: 3 <F / BFL<8。

[0446] [Formula 75]1 <F / ImgH<5

[0447] Equation 75 may set the total effective focal length (F) of the optical system 1000 and the diagonal length (ImgH) of the optical axis of the image sensor 300. The optical system 1000 may have improved aberration characteristics at the size of the vehicle image sensor 300. Equation 75 may preferably satisfy: 2 <F / ImgH<4.1。

[0448] [Formula 76]1 <F / EPD<5

[0449] Equation 76 can set the total effective focal length F and the entrance pupil diameter of the optical system 1000. Accordingly, the overall brightness of the optical system can be controlled. Equation 76 can preferably satisfy: 1 < F / EPD < 3.

[0450] [Equation 77] 0 < BFL / TD < 0.3

[0451] Equation 77 can set the relationship between the optical axis distance TD and the back focal length BFL of the lens of the optical system 1000. Accordingly, the resolution of the optical system can be maintained and the overall size can be controlled. Equation 77 can preferably satisfy: 0 < BFL / TD < 0.2. When the conditional value of BFL / TD is 0.2 or more, since BFL is designed to be larger compared to TD, the size of the entire optical system becomes larger, making it difficult to miniaturize the optical system, and the distance between the seventh lens and the image sensor becomes longer, which may increase unnecessary light amount between the seventh lens and the image sensor, resulting in problems such as deterioration of aberration characteristics and reduction of resolution.

[0452] [Equation 78]

[0453]

[0454] In Equation 78, Z can mean the distance in the direction of the optical axis from an arbitrary position on the aspherical surface to the vertex of the aspherical surface. Y can mean the distance from an arbitrary position on the aspherical surface to the optical axis in the direction perpendicular to the optical axis. c can mean the curvature of the lens, and K can mean the conic constant. Additionally, A, B, C, D, E, and F can mean aspherical coefficients.

[0455] The optical system 1000 according to an embodiment can satisfy at least one or two or more of Equations 1 to 40. At least one or two or more of Equations 1 to 40 can satisfy at least one or two or more of Equations 40 to 77. In this case, the optical system 1000 can have improved optical characteristics, improved resolution, and improved aberration and distortion characteristics. Additionally, the optical system 1000 can ensure the BFL for applying to the vehicle image sensor 300, compensate for the deterioration of optical characteristics due to temperature change, and minimize the gap between the last lens and the image sensor 300, thereby providing good optical performance at the center and periphery of the FOV.

[0456] Table 3 shows the terms of the above formula in the optical system 1000 of the embodiment, including TTL (mm), BFL, effective focal length F (mm), ImgH (mm), effective diameter CA (mm), thickness (mm), TD (mm) which is the optical axis distance from the first surface S1 to the fourteenth surface S14, the focal length F1, F2, F3, F4, F5, F6 and F7 (mm) of each lens of the first lens to the seventh lens, the sum of the refractive index of each lens, the sum of the Abbe number of each lens, the sum of the center thickness of each lens (mm), the sum of the center distances between adjacent lenses, the effective diameter, the diagonal FOV (degrees), the edge thickness ET, the focal length of the first lens group and the second lens group, the F number, etc.

[0457] [Table 3]

[0458]

[0459]

[0460]

[0461] Table 4 shows the result values ​​of the above-mentioned equations 1 to 40 in the optical system 1000 of the embodiment. Referring to Table 4, the optical system 1000 satisfies at least one, two or more, or three or more of equations 1 to 44, and the optical system 1000 can have good optical performance and excellent optical characteristics at the center and peripheral portions of the FOV.

[0462] [Table 4]

[0463]

[0464]

[0465]

[0466] Table 5 shows result values ​​of the above-mentioned equations 41 to 77 in the optical system 1000 of the embodiment. Referring to Table 5, it can be seen that the optical system 1000 satisfies at least one, two or more, or three or more of equations 40 to 77. The optical system 1000 can have good optical performance at the center and peripheral portions of the FOV and can have excellent optical characteristics.

[0467] [Table 5]

[0468]

[0469]

[0470]

[0471] Fig.34 is an example of a plan view of a vehicle to which a camera module or an optical system according to an embodiment of the present invention is applied.

[0472] Reference Fig.34 , the vehicle camera system according to an embodiment of the present invention includes an image generation unit 11, a first information generation unit 12, second information generation units 21, 22, 23, 24, 25 and 26, and a control unit 14. The image generation unit 11 may include at least one camera module 31 disposed in the vehicle, and may capture an image in front of the vehicle and / or the driver to generate an image in front of or inside the vehicle. The image generation unit 11 may use the camera module 31 to capture images in front of the vehicle and around the vehicle in one or more directions to generate an image around the vehicle. Here, the front image and the surrounding image may be digital images, and may include color images, black and white images, and infrared images. In addition, the front image and the surrounding image may include a still image and a moving image. The image generation unit 11 provides the driver image, the front image, and the surrounding image to the control unit 14. Next, the first information generation unit 12 may include at least one radar and / or camera placed in the own vehicle, and detects the front of the own vehicle to generate the first detection information. Specifically, the first information generating unit 12 is placed in the own vehicle, and detects the position, speed, presence and position of pedestrians, etc. of a vehicle located in front of the own vehicle to generate first detection information.

[0473] Using the first detection information generated by the first information generating unit 12, the distance between the own vehicle and the vehicle in front can be controlled to be maintained at a constant level, and the stability of the vehicle operation can be increased in a pre-set specific situation, such as when the driver wants to change the driving lane of the own vehicle or when reversing and parking. The first information generating unit 12 provides the first detection information to the control unit 14. The second information generating units 21, 22, 23, 24, 25 and 26 detect each side of the own vehicle based on the front image generated by the image generating unit 11 and the first detection information generated by the first information generating unit 12 to generate the second detection information. Specifically, the second information generating units 21, 22, 23, 24, 25 and 26 may include at least one radar and / or camera device arranged on the own vehicle, and may detect the position and speed of the vehicle located on the side of the own vehicle, or capture an image. Here, the second information generating units 21, 22, 23, 24, 25 and 26 may be arranged on each of the front corners, side mirrors, rear center and rear corners of the own vehicle.

[0474] At least one information generating unit of these vehicle camera systems may be equipped with an optical system and a camera module having the optical system as described in the above-mentioned embodiments, and may provide or process information acquired through the front, rear, each side or corner area of ​​the vehicle to a user to achieve autonomous driving or protect the safety of the vehicle and surrounding objects.

[0475] The optical system of the camera module according to the embodiment of the present invention can be installed in multiple vehicles to enhance safety regulations, automatic driving functions and increase convenience. The optical system of the camera module is applied to the vehicle as a component for control such as a lane keeping assist system (LKAS), a lane departure warning system (LDWS), a driver monitoring system (DMS), etc. The vehicle camera module can achieve stable optical performance even under changes in ambient temperature, and can provide a price-competitive module, thereby ensuring the reliability of vehicle components.

[0476] The features, structures, effects, etc. described in the embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. In addition, the features, structures, effects, etc. shown in each embodiment can be combined or modified by a person skilled in the art to which the embodiments belong for other embodiments. Therefore, the content related to such combinations and modifications should be interpreted as being included in the scope of the present invention. In addition, although the embodiments have been described above, this is only an example and does not limit the present invention, and the embodiments are illustrated to a person skilled in the art to which the present invention belongs within the scope of the essential features of the embodiments. It can be seen that various modifications and applications that have not yet been made are possible. For example, each component specifically shown in the embodiments can be realized by modification. And the differences associated with these modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

Claims

1. An optical system, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens aligned along the optical axis from the object side toward the sensor side, Wherein, the refractive power of the first lens is negative, Wherein, the composite refractive power of the third lens to the seventh lens is positive, The first lens has a meniscus shape convex toward the sensor side on the optical axis, The center thickness of the first lens is greater than the center thickness of each lens from the second lens to the seventh lens. Wherein, the first lens to the seventh lens 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 surfaces on the optical axis. The aspherical lens is a lens whose object side surface and sensor side surface are aspherical on the optical axis. At least one of the plurality of aspherical lenses is made of a material different from that of the spherical lens.

2. The optical system according to claim 1, wherein: The number of spherical lenses is at least twice the number of aspherical lenses.

3. The optical system according to 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 one other aspherical lens is made of a plastic material.

4. The optical system according to claim 1, wherein: The first lens to the sixth lens are made of glass, Wherein, the seventh lens is made of plastic material.

5. The optical system according to claim 4, wherein: The first lens to the fifth lens are spherical lenses, Wherein, the sixth lens and the seventh lens are aspherical lenses.

6. The optical system according to any one of claims 1 to 4, in, An effective diameter of the first lens is greater than effective diameters of the fourth to seventh lenses.

7. An optical system according to any one of claims 1 to 4, comprising: An aperture stop is disposed at a periphery between the second lens and the third lens.

8. An optical system according to any one of claims 1 to 4, in, A sensor-side surface of the fourth lens and an object-side surface of the fifth lens are bonded.

9. The optical system according to any one of claims 1 to 4, in, The center distance between the i-th lens and the i+1-th lens is CGi, Wherein, the center thickness of the i-th lens is CTi, Among them, when i is 6, the value of CTi / CGi is the smallest. Among them, when i is 1, the value of CTi / CGi is the largest.

10. The optical system according to any one of claims 1 to 4, in, A central thickness of the first lens is greater than a sum of central thicknesses of two adjacent lenses from the second lens to the seventh lens.

11. An optical system comprising: Image sensor; as well as an optical system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens aligned along an optical axis from an object side toward a sensor side, wherein the first lens has negative refractive power, wherein the object side surface of the first lens is concave on the optical axis, The composite refractive power of the second lens to the seventh lens has positive refractive power. Wherein, at least one of the sixth lens and the seventh lens is a plastic lens, Wherein, the lens closest to the plastic lens is made of glass, Among them, the glass lens closest to the plastic lens is a lens having the largest effective diameter difference between the object-side surface and the sensor-side surface of each of the first to seventh lenses.

12. The optical system according to claim 11, in, The lens having the largest effective diameter difference between the object-side surface and the sensor-side surface is the fifth lens.

13. The optical system according to claim 11, in, The sensor-side surface of the first lens is convex on the optical axis, Wherein, the object side surface and the sensor side surface of the first lens have aspherical shapes.

14. The optical system according to claim 13, in, Of the object-side surface and the sensor-side surface of each of the first to seventh lenses, the surface having the smallest absolute value of the radius of curvature on the optical axis is the sensor-side surface of the fifth lens.

15. An optical system according to any one of claims 11 to 14, in, Among the object-side surface and the sensor-side surface of each of the first to seventh lenses, the object-side surface of the seventh lens has the largest absolute value of the radius of curvature.

16. An optical system according to any one of claims 11 to 14, in, The sixth lens and the seventh lens are made of plastic material, The average value of the curvature radius of the object side surface and the sensor side surface of the sixth lens is greater than the absolute value of the average curvature radius of the object side surface and the sensor side surface of each of the first to fifth lenses.

17. An optical system according to any one of claims 1 to 4, in, The sixth lens and the seventh lens are made of plastic material, The average value of the radius of curvature of the object side surface and the sensor side surface of each of the sixth lens and the seventh lens is greater than the absolute value of the average radius of curvature of the object side surface and the sensor side surface of each of the first lens to the fifth lens.

18. A camera module, comprising: Image sensor; as well as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens aligned along an optical axis from an object side toward a sensor side; an aperture stop, the aperture stop being arranged between the spherical lenses among the first lens to the seventh lens; as well as a filter between the seventh lens and the image sensor, wherein the first lens has a meniscus shape convex toward the sensor on the optical axis, The refractive power of the first lens and the seventh lens is negative. Wherein, the composite refractive power of the third lens to the seventh lens is positive, Wherein, the first lens to the seventh lens have at least one aspherical lens, Among the first to seventh lenses, a cemented lens formed by joining two different lenses is arranged between the aperture stop and the image sensor. Wherein, the aspheric lens is arranged between the cemented lens and the image sensor.

Images