Optical imaging system, camera module, electronic device, and vehicle

Abstract

The present invention discloses an optical imaging system, a camera module, an electronic device, and an automobile. In the order from the object side to the image side along the optical axis, the optical imaging system includes a first lens with positive refractive power, a second lens with refractive power, and a third lens with refractive power. The object side surface of the first lens is convex near the optical axis, the image side surface of the second lens is convex near the circumference, the image side surface of the third lens is convex near the circumference, both the object side surface and the image side surface of the third lens are aspherical surfaces, and at least one of the object side surface and the image side surface of the third lens is provided with at least one inflection point. The optical imaging system further satisfies: 55.0deg < FOV / FNO < 71.0deg, where FOV represents the object-side field of view corresponding to the largest imaging circle on the imaging surface, and FNO represents the f-number. The above optical imaging system is beneficial to improving the imaging quality and the thin and light design, and can accurately capture and identify the light and the image position.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and particularly to an optical imaging system, a camera module, an electronic device, and an automobile. Background Art

[0002] As a non-contact recognition implementation method, an infrared imaging lens group has the advantages of all-weather recognition and high recognition rate compared with visible light recognition, higher safety, and a wider application scenario. At present, infrared imaging lens groups have been widely used, but there are problems such as large volume of customized lens groups, fast attenuation of relative illuminance at the edge, and low recognition rate and recognition accuracy in strong light and weak light environments. Summary of the Invention

[0003] Embodiments of the present invention provide an optical imaging system, a camera module, an electronic device, and an automobile.

[0004] An optical imaging system provided by an embodiment of the present invention, in the order from the object side to the image side along the optical axis, the optical imaging system includes:

[0005] A first lens with positive refractive power, the object side surface of the first lens is convex near the optical axis;

[0006] A second lens with refractive power, the image side surface of the second lens is convex near the circumference;

[0007] A third lens with refractive power, the image side surface of the third lens is convex near the circumference, both the object side surface and the image side surface of the third lens are aspherical surfaces, and at least one of the object side surface and the image side surface of the third lens is provided with at least one inflection point;

[0008] The optical imaging system further satisfies the following relational expression:

[0009] 55.0deg < FOV / FNO < 71.0deg;

[0010] Wherein, FOV represents the object-side field of view angle corresponding to the largest imaging circle on the imaging surface of the optical imaging system, and FNO represents the aperture number of the optical imaging system.

[0011] For the above optical imaging system, through reasonable configuration of refractive power and surface type, it is beneficial to improve the imaging quality of the optical imaging system and is beneficial to the thin and light design of the overall structure of the optical imaging system. After meeting the limitations of the above formula, a larger field of view angle can be provided, thereby reasonably controlling distortion, providing a wider recognition range for the optical imaging system, so that the position of light and image can be accurately captured and recognized. At the same time, the aperture value can be reduced, the aperture diameter can be increased, the light input amount can be increased, and further the relative illuminance of the edge field of view can be increased, so that the position of light and image can be further accurately captured and recognized.

[0012] In some embodiments, the optical imaging system satisfies the following relationship:

[0013] 0.74 < TTL / (IMGH*2) < 0.91;

[0014] wherein, TTL represents the distance on the optical axis from the object side surface of the first lens to the imaging surface, and IMGH represents the radius of the largest imaging circle on the imaging surface of the optical imaging system.

[0015] Through the limitation of the above relationship and the cooperation with a reasonable refractive power configuration of the lens group, the optical imaging system can obtain good thinness and lightness, have good aberration balance and image quality improvement ability, and at the same time support high-pixel electronic photosensitive chips. Meeting the above formula, the TTL of the optical imaging system is relatively easy to compress, and thus the total length of the optical imaging system is shorter, enabling the optical imaging system to meet the thin and light design; IMGH determines the size of the electronic photosensitive chip. Meeting the above formula allows the optical imaging system to support larger-sized electronic photosensitive chips, and thus the optical imaging system has high pixels, so as to accurately capture and identify light and image positions, improving the imaging quality of the optical imaging system.

[0016] In some embodiments, the optical imaging system satisfies the following relationship:

[0017] RI / |f3|*SD32 < 67.0;

[0018] wherein, RI represents the relative illuminance of the imaging circle on the imaging surface of the optical imaging system at a radius of 2.3 mm, f3 represents the focal length of the third lens, and SD32 represents the perpendicular distance from the maximum effective diameter of the image side surface of the third lens to the optical axis.

[0019] Through the limitation of the above relationship and by reasonably increasing the FNO, good refractive power distribution and surface type combination, the relative illuminance of the optical imaging system is greatly improved. In the effective imaging range, the uniformity of the relative illuminance of each part can be ensured, which is beneficial to improving the accuracy of image-based recognition, thereby improving the recognition probability in strong light and at night; the third lens can provide both positive refractive power and negative refractive power, thus easily meeting the requirements for the incident angle matching of light rays of different electronic photosensitive chips; by adjusting the surface type of the third lens, sufficient primary astigmatism, distortion, and coma can be generated, so as to form a good balance with the aberrations generated by the first lens and the second lens, contributing to the overall aberration control of the optical imaging system and improving the resolution; meeting the above formula and controlling the aperture of the image side surface of the third lens at the same time can ensure that even in an ultra-thin structure, sufficient dispensing space can be provided when the requirements for the lens barrel structure housing the optical imaging system are stringent, ensuring production stability and yield.

[0020] In some embodiments, the optical imaging system satisfies the following relationship:

[0021] |R21| / |f2| < 134.0;

[0022] wherein, R21 represents the radius of curvature of the object side surface of the second lens at the optical axis, and f2 represents the focal length of the second lens.

[0023] By defining the above relationship, when the diaphragm is in different positions, the second lens can also provide different refractive power distributions, which helps to balance the aberrations of the optical imaging system. Through reasonable setting of the radius of curvature and in cooperation with the aspherical surface type adjustment, the incident light and the outgoing light of the second lens will not generate large angular deflections, reducing the reflection probability of light in each field of view, increasing the light passing rate, and being beneficial to improving the relative illuminance of the marginal field of view. In addition, satisfying the above formula can make the surface type and thickness design of the second lens reasonable, meet the process requirements of the existing mold precision processing technology, and have good forming conditions.

[0024] In some embodiments, the optical imaging system satisfies the following relationship:

[0025] |SLP31| / ET1 < 193.0;

[0026] wherein, SLP31 represents the angle formed between the tangent line of the object side surface of the third lens at the maximum effective diameter and the axis perpendicular to the optical axis, and ET1 represents the distance in the optical axis direction from the maximum effective diameter of the object side surface of the first lens to the maximum effective diameter of the image side surface of the first lens.

[0027] By defining the above relationship, the angle of the object side surface of the third lens at the maximum effective diameter can be effectively controlled, the risk of light leakage in the marginal field of view can be avoided, thus avoiding a greater impact on the imaging effect. At the same time, the forming processability of the third lens is improved, the processing difficulties of mold manufacturing and forming are reduced, and the multiple reflections of light between the second lens and the third lens are avoided, thus avoiding the influence of stray light ghosts during imaging. Satisfying the above formula can avoid the risk of light leakage in the marginal field of view, reduce the influence of stray light ghosts during imaging, and provide sufficient thickness for the front wall thickness of the lens barrel housing the optical imaging system while providing an appropriate surface type curvature on the object side surface of the first lens, thus reducing the lens pressure test risk. When the first lens has a meniscus surface type, the introduced primary aberration is small, which is convenient for the second lens and the third lens to correct aberrations and helps to reduce the tolerance sensitivity of the first lens.

[0028] In some embodiments, the optical imaging system satisfies the following relationship:

[0029] 0.3 < f1 / f12 < 2.7;

[0030] Wherein, f1 represents the focal length of the first lens, and f12 represents the combined focal length of the first lens and the second lens.

[0031] By defining the above relationship, the refractive powers of the first lens and the second lens are reasonably distributed, which can provide appropriate light deflection for different diaphragm configuration schemes, avoid the concentration of aberrations in the optical imaging system and the concentration of tolerance sensitivity in lens assembly due to excessive refractive power. When the structures of the first lens and the second lens are reasonably distributed, it can provide good support for the layout of the overall structure of the optical imaging system, help to reasonably distribute the gaps, and then a light shield can be used to improve the stray light situation.

[0032] In some embodiments, the optical imaging system satisfies the following relationship:

[0033] 0.6 < ET23 / ET12 < 11.0;

[0034] Wherein, ET23 represents the distance in the optical axis direction from the maximum effective diameter of the image side of the second lens to the maximum effective diameter of the object side of the third lens, and ET12 represents the distance in the optical axis direction from the maximum effective diameter of the image side of the first lens to the maximum effective diameter of the object side of the second lens.

[0035] By defining the above relationship, the position distribution among the first lens, the second lens and the third lens can be made reasonable, with good edge gaps, which is beneficial to the reasonable layout of the overall structure of the optical imaging system, helps to reduce the molding risk of lens assembly, and keeps the center thickness and air gaps of each lens within a reasonable range. Combined with the reasonable distribution of refractive powers, the tolerance sensitivity of each lens can be reduced.

[0036] In some embodiments, the optical imaging system satisfies the following relationship:

[0037] 0.7 < BF / BF32 < 0.95;

[0038] Wherein, BF represents the minimum distance in the optical axis direction between the image side of the third lens and the imaging surface, and BF32 represents the distance in the optical axis direction between the maximum effective diameter of the image side of the third lens and the imaging surface.

[0039] Through the limitation of the above relationship, an appropriate optical back focal distance can be provided for the optical imaging system, meeting various actual back focal requirements, thereby reducing the layout difficulty of accommodating the optical imaging system in the lens barrel, increasing the dispensing space, and further improving the production stability; when the overall shape of the third lens surface is in a W shape, the change in the surface shape is more likely to reduce the light deflection angle of the light, improve the relative illuminance of the peripheral field of view, reduce the tolerance sensitivity of the third lens, and the change in the surface shape helps to correct the aberration of the optical imaging system and improve the imaging performance.

[0040] A camera module provided by an embodiment of the present invention, the camera module includes:

[0041] An image sensor; and

[0042] The optical imaging system according to any of the above embodiments, the image sensor is installed on the image side of the optical imaging system, and the image sensor is used to convert the optical signal that passes through the optical imaging system and reaches the imaging surface into an electrical signal.

[0043] The above camera module having the optical imaging system is beneficial to improving the image quality and the thin and light design of the overall structure of the camera module, the field of view has a high relative brightness, and the light and the image position can be accurately captured and identified.

[0044] An electronic device provided by an embodiment of the present invention, the electronic device includes:

[0045] A housing; and

[0046] The camera module according to the above embodiment, the camera module is installed on the housing.

[0047] The above electronic device having the camera module is beneficial to improving the image quality and the thin and light design of the overall structure of the camera module, the field of view has a high relative brightness, and the light and the image position can be accurately captured and identified.

[0048] An automobile provided by an embodiment of the present invention, the automobile includes:

[0049] A vehicle body; and

[0050] The camera module according to the above embodiment, the camera module is disposed on the vehicle body to obtain environmental information around the vehicle body.

[0051] The above automobile having the camera module is beneficial to improving the image quality and the thin and light design of the overall structure of the camera module, the field of view has a high relative brightness, and the light and the image position can be accurately captured and identified.

[0052] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0054] Figure 1 is a schematic structural diagram of the optical imaging system according to the first embodiment of the present application;

[0055] Figure 2 A is the spherical aberration diagram (mm) of the optical imaging system according to the first embodiment of the present application;

[0056] Figure 2 B is the astigmatism diagram (mm) of the optical imaging system according to the first embodiment of the present application;

[0057] Figure 2 C is the distortion diagram (%) of the optical imaging system according to the first embodiment of the present application;

[0058] Figure 3 is a schematic structural diagram of the optical imaging system according to the second embodiment of the present application;

[0059] Figure 4 A is the spherical aberration diagram (mm) of the optical imaging system according to the second embodiment of the present application;

[0060] Figure 4 B is the astigmatism diagram (mm) of the optical imaging system according to the second embodiment of the present application;

[0061] Figure 4 C is the distortion diagram (%) of the optical imaging system according to the second embodiment of the present application;

[0062] Figure 5 is a schematic structural diagram of the optical imaging system according to the third embodiment of the present application;

[0063] Figure 6 A is the spherical aberration diagram (mm) of the optical imaging system according to the third embodiment of the present application;

[0064] Figure 6 B is the astigmatism diagram (mm) of the optical imaging system according to the third embodiment of the present application;

[0065] Figure 6 C is the distortion diagram (%) of the optical imaging system according to the third embodiment of the present application;

[0066] Figure 7 is a schematic structural diagram of the optical imaging system according to the fourth embodiment of the present application;

[0067] Figure 8A is the spherical aberration diagram (mm) of the optical imaging system in Embodiment 4 of the present application;

[0068] Figure 8 B is the astigmatism diagram (mm) of the optical imaging system in Embodiment 4 of the present application;

[0069] Figure 8 C is the distortion diagram (%) of the optical imaging system in Embodiment 4 of the present application;

[0070] Figure 9 is the structural schematic diagram of the optical imaging system in Embodiment 5 of the present application;

[0071] Figure 10 A is the spherical aberration diagram (mm) of the optical imaging system in Embodiment 5 of the present application;

[0072] Figure 10 B is the astigmatism diagram (mm) of the optical imaging system in Embodiment 5 of the present application;

[0073] Figure 10 C is the distortion diagram (%) of the optical imaging system in Embodiment 5 of the present application;

[0074] Figure 11 is the structural schematic diagram of the optical imaging system in Embodiment 6 of the present application;

[0075] Figure 12 A is the spherical aberration diagram (mm) of the optical imaging system in Embodiment 6 of the present application;

[0076] Figure 12 B is the astigmatism diagram (mm) of the optical imaging system in Embodiment 6 of the present application;

[0077] Figure 12 C is the distortion diagram (%) of the optical imaging system in Embodiment 6 of the present application;

[0078] Figure 13 is the structural schematic diagram of the optical imaging system in Embodiment 7 of the present application;

[0079] Figure 14 A is the spherical aberration diagram (mm) of the optical imaging system in Embodiment 7 of the present application;

[0080] Figure 14 B is the astigmatism diagram (mm) of the optical imaging system in Embodiment 7 of the present application;

[0081] Figure 14 C is the distortion diagram (%) of the optical imaging system in Embodiment 7 of the present application;

[0082] Figure 15 is the module structural schematic diagram of the camera module of the present embodiment;

[0083] Figure 16 It is a schematic structural diagram of an electronic device according to an embodiment of the present application;

[0084] Figure 17 It is a schematic module diagram of an electronic device according to an embodiment of the present application.

[0085] Main description of the attached drawing elements:

[0086] Optical imaging system 10, diaphragm 11, infrared band-pass filter 13;

[0087] Electronic device 20;

[0088] Automobile 100, camera module 110, vehicle body 130. Specific embodiments

[0089] The following describes in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0090] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality" means two or more than two unless otherwise specifically defined.

[0091] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0092] The disclosure of the present invention provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplicity and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0093] Please refer to Figures 1-14 , an optical imaging system 10 provided by an embodiment of the present application. In the order from the object side to the image side along the optical axis L, the optical imaging system 10 includes a first lens L1 having a positive refractive power, a second lens L2 having a refractive power, and a third lens L3 having a refractive power. The object side surface of the first lens L1 is convex near the optical axis L. The image side surface of the second lens L2 is convex near the circumference. The image side surface of the third lens L3 is convex near the circumference. Both the object side surface and the image side surface of the third lens L3 are aspherical. At least one inflection point is provided on at least one of the object side surface and the image side surface of the third lens L3. The optical imaging system 10 satisfies the following relationship: 55.0deg < FOV / FNO < 71.0deg; where FOV represents the object-side field of view angle corresponding to the maximum imaging circle of the optical imaging system 10, and FNO represents the f-number of the optical imaging system 10.

[0094] For the above optical imaging system 10, through the reasonable configuration of refractive power and surface type, it is beneficial to improve the imaging quality of the optical imaging system 10 and is beneficial to the thin and light design of the overall structure of the optical imaging system 10. After satisfying the limitations of the above formula, a larger field of view angle can be provided, thereby reasonably controlling distortion, providing a wider recognition range for the optical imaging system, and thus accurately capturing and recognizing the position of light and images. At the same time, the f-number can be reduced, the aperture diameter can be increased, the amount of incident light can be increased, and further the relative illuminance of the marginal field of view can be increased, so as to further accurately capture and recognize the position of light and images.

[0095] Specifically, when the optical imaging system 10 is a near-infrared optical system, in the case of providing a configuration where the aperture stop 11 is located on the object side of the first lens L1 or between the first lens L1 and the second lens L2, through the limitation of the above relationship, the FNO is smaller and the aperture is larger, which can provide sufficient light input for the optical imaging system 10, facilitating infrared recognition in low-light environments. Moreover, the reduction of FNO helps to suppress the rapid decline of the relative illuminance in the edge field of view of the wide-angle lens. At the same time, when the above formula is satisfied, the field of view FOV is larger, which can reasonably control distortion, providing a wider recognition range for infrared recognition and having better convenience.

[0096] More specifically, in some embodiments, FOV / FNO can take values of 55.76, 55.92, 63.27, 68.35, 63.80, 70.57, and any other values greater than 55.0 and less than 71.0 (unit: deg or °). In some embodiments, the value range of FNO is (1.27, 1.42), and the value range of FOV is (79°, 97°).

[0097] In certain embodiments, the optical imaging system 10 satisfies the following relationship: 0.74 < TTL / (IMGH*2) < 0.91; where TTL represents the distance from the object side of the first lens L1 to the imaging plane on the optical axis L, and IMGH represents the radius of the largest imaging circle on the imaging plane of the optical imaging system 10.

[0098] Thus, through the limitation of the above relationship and in combination with the reasonable configuration of the refractive powers of each lens, the optical imaging system 10 can achieve good thinness and lightness, have good aberration balance and image quality improvement ability, and at the same time support high-pixel electronic photosensitive chips.

[0099] Specifically, in some embodiments, TTL / (IMGH*2) can take values of 0.75, 0.80, 0.81, 0.82, 0.83, 0.88, 0.90, and any other values greater than 0.74 and less than 0.91.

[0100] In addition, IMGH can determine the size of the electronic photosensitive chip. The larger the IMGH, the larger the maximum size of the electronic photosensitive chip that can be supported. When TTL / (IMGH*2) > 0.91, although the optical imaging system 10 can achieve a good aberration balance and resolution, as the electronic photosensitive chip increases, it becomes difficult to compress the distance from the object side surface of the first lens L1 to the imaging surface on the optical axis L, resulting in a decrease in the thinness and lightness of the optical imaging system 10. When TTL / (IMGH*2) < 0.74, the optical imaging system 10 has good thinness and lightness, but the overall size being too small will greatly limit the balance of aberrations, the matching of the electronic photosensitive chip, and the optimization of resolution. When the above formula is satisfied, the TTL of the optical imaging system 10 is relatively easy to compress, and thus the total length of the optical imaging system 10 is shorter, enabling the optical imaging system 10 to meet the thin and light design requirements. When the above formula is satisfied, the optical imaging system 10 can support a larger-sized electronic photosensitive chip, thereby enabling the optical imaging system 10 to have a high pixel count, so that the light and image positions can be accurately captured and recognized, improving the imaging quality of the optical imaging system 10.

[0101] In some embodiments, the optical imaging system 10 satisfies the following relational expression: RI / |f3|*SD32 < 67.0; where RI represents the relative illuminance at a radius of 2.3 mm of the imaging circle on the imaging surface of the optical imaging system 10, f3 represents the focal length of the third lens L3, and SD32 represents the perpendicular distance from the maximum effective diameter of the image side surface of the third lens L3 to the optical axis L.

[0102] Thus, through the limitation of the above relational expression, and by reasonably increasing FNO, having a good refractive power distribution and surface type combination, the relative illuminance of the optical imaging system 10 is greatly improved. In the effective imaging range, the uniformity of the relative illuminance of each part can be ensured, which is beneficial to improving the accuracy of image-based recognition, thereby improving the recognition probability in strong light and at night.

[0103] Specifically, in some embodiments, RI / |f3|*SD32 can take values of 1.03, 4.87, 12.69, 34.38, 44.68, 66.35, 66.79, and any other value less than 67.0. In some embodiments, the value range of RI is (37%, 51%).

[0104] In addition, the third lens L3 can provide either positive refractive power or negative refractive power, thus easily meeting the requirements for matching the incident angles of light rays of different electronic photosensitive chips. By adjusting the surface shape of the third lens L3, sufficient primary astigmatism, distortion, and coma can be generated, so as to form a good balance with the aberrations generated by the first lens L1 and the second lens L2, which helps to control the overall aberrations of the optical imaging system 10 and improve the resolution. When the above formula is satisfied and the aperture of the image side of the third lens L3 is controlled, even in the case of a very strict requirement for the barrel structure housing the optical imaging system 10, enough dispensing space can be provided even for an ultra-thin structure, ensuring production stability and yield.

[0105] In some embodiments, the optical imaging system 10 satisfies the following relationship: |R21| / |f2| < 134.0; where R21 represents the curvature radius of the object side of the second lens L2 at the optical axis L, and f2 represents the focal length of the second lens L2.

[0106] Thus, through the limitation of the above relationship, different refractive power distributions can be provided by the second lens L2 in the case where the diaphragm 11 is at different positions, which helps to balance the aberrations of the optical imaging system 10. By setting a reasonable curvature radius and adjusting the aspherical surface shape, large angular deflections will not occur when light rays enter and exit the second lens L2, reducing the reflection probability of light rays in each field of view, increasing the light passing rate, and being beneficial to improving the relative illuminance of the marginal field of view. In addition, when the above formula is satisfied, the surface shape and thickness design of the second lens L2 can be reasonable, meeting the process requirements of the existing precision machining technology of molds and having good forming conditions.

[0107] Specifically, in some embodiments, |R21| / |f2| can take values of 0.43, 0.57, 1.11, 1.25, 7.44, 7.60, 133.46, and any other value less than 134.0.

[0108] In some embodiments, the optical imaging system 10 satisfies the following relationship: |SLP31| / ET1 < 193.0; where SLP31 represents the angle formed between the tangent line of the object side of the third lens L3 at the maximum effective diameter and the axis perpendicular to the optical axis L, and ET1 represents the distance in the optical axis L direction from the maximum effective diameter of the object side of the first lens L1 to the maximum effective diameter of the image side of the first lens L1.

[0109] Correspondingly, when SLP31 > 0, there is a relatively high risk of light leakage in the peripheral field of view of the optical imaging system 10, which is likely to have a significant impact on the imaging effect. When SLP31 < -50, there is a certain risk of forming the object side surface of the third lens L3, which brings certain difficulties to the mold manufacturing and forming processes, and is also likely to form multiple reflections of light between the second lens L2 and the third lens L3, resulting in the influence of stray light ghosts.

[0110] Thus, through the limitation of the above relational expressions, the angle of the object side surface of the third lens L3 at the maximum effective diameter can be effectively controlled, the risk of light leakage in the peripheral field of view can be avoided, thereby avoiding a significant impact on the imaging effect. At the same time, the formability of the third lens L3 is improved, the processing difficulties of mold manufacturing and forming are reduced, and multiple reflections of light between the second lens L2 and the third lens L3 are avoided, resulting in the influence of stray light ghosts during imaging. Meeting the above formula can avoid the risk of light leakage in the peripheral field of view, reduce the influence of stray light ghosts during imaging, and provide sufficient thickness for the front wall thickness of the lens barrel accommodating the optical imaging system 10 while providing an appropriate surface curvature on the object side surface of the first lens L1, thereby reducing the risk of lens pressure testing; in the case where the first lens L1 has a meniscus surface shape, the introduction of primary aberration is small, which is convenient for the second lens L2 and the third lens L3 to correct aberrations, and helps to reduce the tolerance sensitivity of the first lens L1.

[0111] Specifically, in some embodiments, |SLP31| / ET1 can take values of 0.06, 0.24, 7.63, 9.31, 46.21, 105.12, 192.85, and any other value less than 193.0.

[0112] In certain embodiments, the optical imaging system 10 satisfies the following relational expression: 0.3 < f1 / f12 < 2.7; where f1 represents the focal length of the first lens L1, and f12 represents the combined focal length of the first lens L1 and the second lens L2.

[0113] Thus, through the limitation of the above relational expressions, the refractive powers of the first lens L1 and the second lens L2 are reasonably distributed, which can provide appropriate light deflection for different aperture 11 configuration schemes, avoid the concentration of aberrations and the concentration of tolerance sensitivity of lens assembly caused by excessive refractive power. In the case of a reasonable distribution of the structures of the first lens L1 and the second lens L2, it can provide good support for the overall structure layout of the optical imaging system 10, help to reasonably distribute the gaps, and then a light shield can be used to improve the stray light situation.

[0114] Specifically, in some embodiments, f1 / f12 can take values of 0.37, 1.18, 1.67, 2.35, 2.39, 2.65, and any other value greater than 0.3 and less than 2.7.

[0115] In some embodiments, the optical imaging system 10 satisfies the following relationship: 0.6 < ET23 / ET12 < 11.0; where ET23 represents the distance in the direction of the optical axis L from the maximum effective diameter at the image side of the second lens L2 to the maximum effective diameter at the object side of the third lens L3, and ET12 represents the distance in the direction of the optical axis L from the maximum effective diameter at the image side of the first lens L1 to the maximum effective diameter at the object side of the second lens L2.

[0116] Thus, through the limitation of the above relationship, the position distribution among the first lens L1, the second lens L2, and the third lens L3 can be made reasonable, with good edge clearances, which is beneficial to the reasonable arrangement of the overall structure of the optical imaging system 10, helpful for reducing the molding risk of lens assembly, and enabling the center thickness and air gap of each lens to be within a reasonable range. Coupled with the reasonable distribution of refractive power, the tolerance sensitivity of each lens can be reduced.

[0117] Specifically, in some embodiments, ET23 / ET12 can take values of 0.65, 2.07, 2.11, 2.40, 4.03, 7.10, 10.92, and any other value greater than 0.6 and less than 11.0.

[0118] In some embodiments, the optical imaging system 10 satisfies the following relationship: 0.7 < BF / BF32 < 0.95; where BF represents the minimum distance in the direction of the optical axis L between the image side of the third lens L3 and the imaging plane, and BF32 represents the distance in the direction of the optical axis L between the maximum effective diameter at the image side of the third lens L3 and the imaging plane.

[0119] Thus, through the limitation of the above relationship, an appropriate optical back focal distance can be provided for the optical imaging system 10 to meet various actual back focal requirements, thereby reducing the arrangement difficulty when the optical imaging system 10 is housed in the lens barrel, increasing the dispensing space, and further enhancing the production stability; when the surface shape of the third lens L3 is overall in a W shape, the change in the surface shape makes it easier to guide light, reduces the light deflection angle, increases the relative illuminance of the marginal field of view, reduces the tolerance sensitivity of the third lens L3, and the change in the surface shape helps to correct the aberration of the optical imaging system 10 and improve the imaging performance.

[0120] In addition, in the embodiments of the present invention, the imaging plane refers to the image plane formed by the incident light on the image side of the optical imaging system 10.

[0121] Specifically, in some embodiments, BF / BF32 can take values of 0.72, 0.73, 0.74, 0.93, and any other value greater than 0.7 and less than 0.95.

[0122] In addition, in the embodiments of the present application, the aspherical surface shape is determined by the following formula:

[0123]

[0124] where h is the height of any point on the aspherical surface to the optical axis L, c is the vertex curvature, k is the conic constant, and Ai is the correction coefficient of the i-th order of the aspherical surface.

[0125] The present application will be described in detail with the following specific embodiments in conjunction with the accompanying drawings. In addition, it can be understood that in other embodiments, the material of the lens can be at least one of plastic, glass, resin, silica gel, polymethyl methacrylate (acrylic), and polycarbonate. In one embodiment, the materials of the first lens L1, the second lens L2, and the third lens L3 are glass.

[0126] Embodiment 1:

[0127] Please refer to Figure 1 and Figure 2 , in the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a diaphragm 11, a first lens L1, a second lens L2, a third lens L3, and an infrared band-pass filter 13.

[0128] The first lens L1 has a positive refractive power. Its object side surface S11 is convex near the optical axis L and convex near the circumference. Its image side surface S12 is concave near the optical axis L and concave near the circumference. Both S11 and S12 are aspherical surfaces.

[0129] The second lens L2 has a negative refractive power. Its object side surface S21 is concave near the optical axis L and concave near the circumference. Its image side surface S22 is concave near the optical axis L and convex near the circumference. Both S21 and S22 are aspherical surfaces.

[0130] The third lens L3 has a positive refractive power. Its object side surface S31 is convex near the optical axis L and concave near the circumference. Its image side surface S32 is concave near the optical axis L and convex near the circumference. Both S31 and S32 are aspherical surfaces.

[0131] In Embodiment 1, the distance TTL from the object side surface S11 of the first lens L1 to the imaging surface on the optical axis L is 3.98 mm, the radius IMGH of the largest imaging circle on the imaging surface of the optical imaging system 10 is 2.42 mm, the field of view angle FOV of the optical imaging system 10 is 79.40°, the f-number FNO of the optical imaging system 10 is 1.42, the focal length f1 of the first lens L1 is 4.04 mm, the focal length f2 of the second lens L2 is -4.13 mm, the focal length f3 of the third lens L3 is 2.52 mm, and the radius of curvature R21 of the object side surface S21 of the second lens L2 at the optical axis L is -4.58 mm.

[0132] The optical imaging system 10 also meets the conditions in the following table:

[0133] Table 1

[0134]

[0135] Table 2

[0136]

[0137]

[0138] Figure 2 A, Figure 2 B, Figure 2 C are respectively the spherical aberration curve graph, astigmatism curve graph and distortion curve graph in the first embodiment.

[0139] The abscissa of the spherical aberration curve graph represents the focus shift, and the ordinate represents the normalized field of view. Figure 2 When the wavelengths given in A are 950.0000 nm, 940.0000 nm, and 930.0000 nm respectively, the focus shifts of different fields of view are all within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0140] The abscissa of the astigmatism curve graph represents the focus shift, and the ordinate represents the image height. Figure 2 The astigmatism curve given in B shows that when the wavelength is 940.0000 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.10 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0141] The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height. Figure 2 The distortion curve given in C shows that the distortion at a wavelength of 940.0000 nm is within ±2.5%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0142] According to Figure 2 it can be known that the optical imaging system 10 given in the first embodiment can achieve good imaging effects.

[0143] Second Embodiment:

[0144] Please refer to Figure 3 and Figure 4 . In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a diaphragm 11, a first lens L1, a second lens L2, a third lens L3, and an infrared band-pass filter 13.

[0145] The first lens L1 has a positive refractive power. Its object side S11 is convex near the optical axis L and convex near the circumference. Its image side S12 is concave near the optical axis L and concave near the circumference. Both S11 and S12 are aspherical surfaces.

[0146] The second lens L2 has a positive refractive power. Its object side S21 is convex near the optical axis L and concave near the circumference. Its image side S22 is convex near the optical axis L and convex near the circumference. Both S21 and S22 are aspherical surfaces.

[0147] The third lens L3 has a negative refractive power. Its object side S31 is concave near the optical axis L and convex near the circumference. Its image side S32 is concave near the optical axis L and convex near the circumference. Both S31 and S32 are aspherical surfaces.

[0148] In the second embodiment, the distance TTL from the object side S11 of the first lens L1 to the imaging surface on the optical axis L is 4.00 mm, the radius IMGH of the maximum imaging circle on the imaging surface of the optical imaging system 10 is 2.40 mm, the field of view angle FOV of the optical imaging system 10 is 79.18°, the f-number FNO of the optical imaging system 10 is 1.42, the focal length f1 of the first lens L1 is 4.38 mm, the focal length f2 of the second lens L2 is 1.69 mm, the focal length f3 of the third lens L3 is -2.02 mm, and the radius of curvature R21 of the object side S21 of the second lens L2 at the optical axis L is 225.19 mm.

[0149] The optical imaging system 10 also satisfies the conditions in the following table:

[0150] Table 3

[0151]

[0152]

[0153] Table 4

[0154]

[0155] Figure 4 A, Figure 4 B, Figure 4 C are respectively the spherical aberration curve graph, the astigmatism curve graph, and the distortion curve graph in the second embodiment.

[0156] The abscissa of the spherical aberration curve graph represents the focus shift, and the ordinate represents the normalized field of view. Figure 4When the wavelengths given in A are 950.0000 nm, 940.0000 nm, and 930.0000 nm respectively, the focus offsets in different fields of view are all within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0157] The abscissa of the astigmatism curve graph represents the focus offset, and the ordinate represents the image height. Figure 4 The astigmatism curve given in B shows that when the wavelength is 940.0000 nm, the focus offsets of the sagittal image plane and the meridional image plane are both within ±0.20 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0158] The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height. Figure 4 The distortion curve given in C shows that when the wavelength is 940.0000 nm, the distortion is within ±8%, indicating that the distortion of the optical imaging system 10 in this embodiment has a certain correction effect and imaging quality.

[0159] According to Figure 4 it can be known that the optical imaging system 10 given in the second embodiment can achieve good imaging effects.

[0160] Embodiment Three:

[0161] Please refer to Figure 5 and Figure 6 In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a first lens L1, a diaphragm 11, a second lens L2, a third lens L3, and an infrared band-pass filter 13.

[0162] The first lens L1 has a positive refractive power. Its object side surface S11 is convex near the optical axis L and convex near the circumference. Its image side surface S12 is concave near the optical axis L and concave near the circumference. Both S11 and S12 are aspherical surfaces.

[0163] The second lens L2 has a positive refractive power. Its object side surface S21 is concave near the optical axis L and concave near the circumference. Its image side surface S22 is convex near the optical axis L and convex near the circumference. Both S21 and S22 are aspherical surfaces.

[0164] The third lens L3 has a positive refractive power. Its object side surface S31 is convex near the optical axis L and concave near the circumference. Its image side surface S32 is concave near the optical axis L and convex near the circumference. Both S31 and S32 are aspherical surfaces.

[0165] In the third embodiment, the distance TTL from the object side surface S11 of the first lens L1 to the imaging surface on the optical axis L is 4.30 mm, the radius IMGH of the maximum imaging circle on the imaging surface of the optical imaging system 10 is 2.39 mm, the field of view angle FOV of the optical imaging system 10 is 79.40°, the f-number FNO of the optical imaging system 10 is 1.42, the focal length f1 of the first lens L1 is 3.90 mm, the focal length f2 of the second lens L2 is 8.60 mm, the focal length f3 of the third lens L3 is 66.19 mm, and the radius of curvature R21 of the object side surface S21 of the second lens L2 at the optical axis L is -4.93 mm.

[0166] The optical imaging system 10 also satisfies the conditions in the following table:

[0167] Table 5

[0168]

[0169]

[0170] Table 6

[0171]

[0172] Figure 6 A, Figure 6 B, Figure 6 C are respectively the spherical aberration curve graph, the astigmatism curve graph and the distortion curve graph in the third embodiment.

[0173] The abscissa of the spherical aberration curve graph represents the focus shift, and the ordinate represents the normalized field of view. Figure 6 When the wavelengths given in A are 950.0000 nm, 940.0000 nm, and 930.0000 nm respectively, the focus shifts at different fields of view are all within ±0.10 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0174] The abscissa of the astigmatism curve graph represents the focus shift, and the ordinate represents the image height. Figure 6 The astigmatism curve given in B represents that when the wavelength is 940.0000 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.10 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0175] The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height. Figure 6 The distortion curve given in C represents that when the wavelength is 940.0000 nm, the distortion is within ±5.0%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0176] According toFigure 6 It can be seen that the optical imaging system 10 given in the third embodiment can achieve good imaging effects.

[0177] Embodiment Four:

[0178] Please refer to Figure 7 and Figure 8 In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a diaphragm 11, a first lens L1, a second lens L2, a third lens L3, and an infrared band-pass filter 13.

[0179] The first lens L1 has a positive refractive power. Its object side surface S11 is convex near the optical axis L and convex near the circumference. Its image side surface S12 is concave near the optical axis L and concave near the circumference. Both S11 and S12 are aspherical surfaces.

[0180] The second lens L2 has a positive refractive power. Its object side surface S21 is concave near the optical axis L and concave near the circumference. Its image side surface S22 is concave near the optical axis L and convex near the circumference. Both S21 and S22 are aspherical surfaces.

[0181] The third lens L3 has a negative refractive power. Its object side surface S31 is concave near the optical axis L and concave near the circumference. Its image side surface S32 is concave near the optical axis L and convex near the circumference. Both S31 and S32 are aspherical surfaces.

[0182] In Embodiment Four, the distance TTL from the object side surface S11 of the first lens L1 to the imaging surface on the optical axis L is 3.90 mm. The radius IMGH of the largest imaging circle on the imaging surface of the optical imaging system 10 is 2.40 mm. The field of view angle FOV of the optical imaging system 10 is 83.52°. The f-number FNO of the optical imaging system 10 is 1.32. The focal length f1 of the first lens L1 is 3.83 mm. The focal length f2 of the second lens L2 is 1.25 mm. The focal length f3 of the third lens L3 is -1.47 mm. The radius of curvature R21 of the object side surface S21 of the second lens L2 at the optical axis L is -9.52 mm.

[0183] The optical imaging system 10 also satisfies the conditions in the following table:

[0184] Table 7

[0185]

[0186] Table 8

[0187]

[0188] Figure 8 A, Figure 8 B, Figure 8C are respectively the spherical aberration curve graph, astigmatism curve graph, and distortion curve graph in the fourth embodiment.

[0189] The abscissa of the spherical aberration curve graph represents the focus shift, and the ordinate represents the normalized field of view. Figure 8 When the wavelengths given in A are 950.0000 nm, 940.0000 nm, and 930.0000 nm respectively, the focus shifts at different fields of view are all within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0190] The abscissa of the astigmatism curve graph represents the focus shift, and the ordinate represents the image height. Figure 8 The astigmatism curve graph given in B shows that when the wavelength is 940.0000 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.20 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0191] The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height. Figure 8 The distortion curve graph given in C shows that when the wavelength is 940.0000 nm, the distortion is within ±5.0%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0192] According to Figure 8 it can be known that the optical imaging system 10 given in the fourth embodiment can achieve good imaging effects.

[0193] Embodiment Five:

[0194] Please refer to Figure 9 and Figure 10 , in the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a diaphragm 11, a first lens L1, a second lens L2, a third lens L3, and an infrared band-pass filter 13.

[0195] The first lens L1 has a positive refractive power. Its object side surface S11 is convex near the optical axis L and convex near the circumference. Its image side surface S12 is concave near the optical axis L and concave near the circumference. Both S11 and S12 are aspherical surfaces.

[0196] The second lens L2 has a positive refractive power. Its object side surface S21 is concave near the optical axis L and concave near the circumference. Its image side surface S22 is concave near the optical axis L and convex near the circumference. Both S21 and S22 are aspherical surfaces.

[0197] The third lens L3 has a negative refractive power. Its object side surface S31 is convex near the optical axis L and concave near the circumference. Its image side surface S32 is concave near the optical axis L and convex near the circumference. Both S31 and S32 are aspherical surfaces.

[0198] In the fifth embodiment, the distance TTL from the object side surface S11 of the first lens L1 to the imaging surface on the optical axis L is 3.82 mm, the radius IMGH of the largest imaging circle on the imaging surface of the optical imaging system 10 is 2.40 mm, the field of view angle FOV of the optical imaging system 10 is 89.62°, the f-number FNO of the optical imaging system 10 is 1.27, the focal length f1 of the first lens L1 is 4.05 mm, the focal length f2 of the second lens L2 is 1.28 mm, the focal length f3 of the third lens L3 is -1.68 mm, and the radius of curvature R21 of the object side surface S21 of the second lens L2 at the optical axis L is -9.51 mm.

[0199] The optical imaging system 10 also satisfies the conditions in the following table:

[0200] Table 9

[0201]

[0202]

[0203] Table 10

[0204]

[0205] Figure 10 A, Figure 10 B, Figure 10 C are respectively the spherical aberration curve graph, the astigmatism curve graph, and the distortion curve graph in the fifth embodiment.

[0206] The abscissa of the spherical aberration curve graph represents the focus shift, and the ordinate represents the normalized field of view. Figure 10 When the wavelengths given in A are 950.0000 nm, 940.0000 nm, and 930.0000 nm respectively, the focus shifts at different fields of view are all within ±0.05 mm, indicating that the optical imaging system 10 in this embodiment has a certain improvement effect on spherical aberration and imaging quality.

[0207] The abscissa of the astigmatism curve graph represents the focus shift, and the ordinate represents the image height. Figure 10 The astigmatism curve given in B represents that when the wavelength is 940.0000 nm, the focus shifts of the sagittal image plane and the meridional image plane are generally within ±0.10 mm, indicating that the optical imaging system 10 in this embodiment has the effects of small astigmatism and good imaging quality within a certain image height range.

[0208] The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height. Figure 10The distortion curve given in C indicates that the distortion at a wavelength of 940.0000 nm is within ±5.0%, indicating that the distortion of the optical imaging system 10 in this embodiment has a certain correction effect and good imaging quality.

[0209] According to Figure 10 it can be seen that the optical imaging system 10 given in the fifth embodiment can achieve good imaging effects.

[0210] Embodiment Six:

[0211] Please refer to Figure 11 and Figure 12 In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes the first lens L1, the aperture stop 11, the second lens L2, the third lens L3, and the infrared band-pass filter 13.

[0212] The first lens L1 has a positive refractive power. Its object surface S11 is convex near the optical axis L and convex near the circumference. Its image surface S12 is convex near the optical axis L and convex near the circumference. Both S11 and S12 are aspherical surfaces.

[0213] The second lens L2 has a positive refractive power. Its object surface S21 is concave near the optical axis L and concave near the circumference. Its image surface S22 is convex near the optical axis L and convex near the circumference. Both S21 and S22 are aspherical surfaces.

[0214] The third lens L3 has a positive refractive power. Its object surface S31 is convex near the optical axis L and concave near the circumference. Its image surface S32 is concave near the optical axis L and convex near the circumference. Both S31 and S32 are aspherical surfaces.

[0215] In Embodiment Six, the distance TTL from the object surface S11 of the first lens L1 to the imaging surface on the optical axis L is 4.20 mm, the radius IMGH of the largest imaging circle on the imaging surface of the optical imaging system 10 is 2.39 mm, the field of view angle FOV of the optical imaging system 10 is 90.59°, the f-number FNO of the optical imaging system 10 is 1.42, the focal length f1 of the first lens L1 is 3.79 mm, the focal length f2 of the second lens L2 is 9.50 mm, the focal length f3 of the third lens L3 is 13.99 mm, and the radius of curvature R21 of the object surface S21 of the second lens L2 at the optical axis L is -4.09 mm.

[0216] The optical imaging system 10 also satisfies the conditions in the following table:

[0217] Table 11

[0218]

[0219] Table 12

[0220]

[0221]

[0222] Figure 12 A, Figure 12 B, Figure 12 A, B, and C are respectively the spherical aberration curve graph, astigmatism curve graph, and distortion curve graph in the sixth embodiment.

[0223] The abscissa of the spherical aberration curve graph represents the focus shift, and the ordinate represents the normalized field of view. Figure 12 When the wavelengths given in A are 950.0000 nm, 940.0000 nm, and 930.0000 nm respectively, the focus shifts of different fields of view are all within ±0.10 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0224] The abscissa of the astigmatism curve graph represents the focus shift, and the ordinate represents the image height. Figure 12 The astigmatism curve given in B indicates that when the wavelength is 940.0000 nm, the focus shifts of the sagittal image plane and the meridional image plane are overall within ±0.20 mm, indicating that the optical imaging system 10 in this embodiment has the effect of small astigmatism and good imaging quality within a certain image height range.

[0225] The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height. Figure 12 The distortion curve given in C indicates that when the wavelength is 940.0000 nm, the distortion is overall within ±5.0%, indicating that the distortion of the optical imaging system 10 in this embodiment can be well corrected and has good imaging quality within a certain image height range.

[0226] According to Figure 12 it can be known that the optical imaging system 10 given in the sixth embodiment can achieve good imaging effects.

[0227] Embodiment Seven:

[0228] Please refer to Figure 13 and Figure 14 In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a first lens L1, a diaphragm 11, a second lens L2, a third lens L3, and an infrared band-pass filter 13.

[0229] The first lens L1 has a positive refractive power. Its object side surface S11 is convex near the optical axis L and convex near the circumference. Its image side surface S12 is concave near the optical axis L and concave near the circumference. Both S11 and S12 are aspherical surfaces.

[0230] The second lens L2 has a positive refractive power. Its object side S21 is convex near the optical axis L and is also convex near the circumference. Its image side S22 is convex near the optical axis L and is also convex near the circumference. Both S21 and S22 are aspherical surfaces.

[0231] The third lens L3 has a positive refractive power. Its object side S31 is convex near the optical axis L and is concave near the circumference. Its image side S32 is concave near the optical axis L and is convex near the circumference. Both S31 and S32 are aspherical surfaces.

[0232] In the seventh embodiment, the distance TTL from the object side S11 of the first lens L1 to the imaging plane on the optical axis L is 3.58 mm, the radius IMGH of the maximum imaging circle on the imaging plane of the optical imaging system 10 is 2.39 mm, the field of view angle FOV of the optical imaging system 10 is 97.05°, the f-number FNO of the optical imaging system 10 is 1.42, the focal length f1 of the first lens L1 is 4.91 mm, the focal length f2 of the second lens L2 is 5.33 mm, the focal length f3 of the third lens L3 is 5.98 mm, and the radius of curvature R21 of the object side S21 of the second lens L2 at the optical axis L is 6.68 mm.

[0233] The optical imaging system 10 also satisfies the conditions in the following table:

[0234] Table 13

[0235]

[0236] Table 14

[0237]

[0238] Figure 14 A, Figure 14 B, Figure 14 C are respectively the spherical aberration curve graph, the astigmatism curve graph, and the distortion curve graph in the seventh embodiment.

[0239] The abscissa of the spherical aberration curve graph represents the focus shift, and the ordinate represents the normalized field of view. Figure 14 When the wavelengths given in A are 950.0000 nm, 940.0000 nm, and 930.0000 nm respectively, the focus shifts at different fields of view are all within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0240] The abscissa of the astigmatism curve graph represents the focus shift, and the ordinate represents the image height. Figure 14The astigmatism curve shown in B indicates that when the wavelength is 940.0000 nm, the focus offsets of both the sagittal image plane and the meridional image plane are within ±0.20 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0241] The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height. Figure 14 The distortion curve shown in C indicates that when the wavelength is 940.0000 nm, the overall distortion is within ±5.0%, indicating that the distortion of the optical imaging system 10 in this embodiment can be well corrected and has good imaging quality within a certain image height range.

[0242] According to Figure 14 it can be known that the optical imaging system 10 given in the seventh embodiment can achieve good imaging effects.

[0243] In addition, the optical imaging systems 10 in the first to seventh embodiments also meet the conditions in the following table:

[0244] Table 15

[0245]

[0246] Please refer to Figure 15 , a camera module 110 provided by an embodiment of the present application includes a photosensitive element 111 and the optical imaging system 10 of any of the above embodiments. The photosensitive element 111 is installed on the image side of the optical imaging system 10. The photosensitive element 111 is used to convert the optical signal that passes through the optical imaging system 10 and reaches the imaging surface into an electrical signal.

[0247] The above camera module 110 with the optical imaging system 10 is beneficial to improving the image quality and the thin and light design of the overall structure of the camera module 110, has high relative brightness in the viewing length, and can accurately capture and identify the light and the image position.

[0248] It can be understood that the optical signal will change the optical path transmission direction after passing through the optical imaging system 10, so that a high-image-quality picture can be formed on the imaging surface of the optical imaging system 10. The photosensitive element can process the optical signal on the imaging surface into a corresponding electrical signal, and the electrical signal can be transmitted to the electronic display screen, so that the picture of the optical signal on the imaging surface can be displayed through the electronic display screen. In one embodiment, the photosensitive element includes a photoelectric sensor and an analog-to-digital converter. The photoelectric sensor is used to convert the optical signal into an analog signal, and the analog-to-digital converter is used to convert the analog signal output by the photoelectric sensor into a digital signal.

[0249] Please refer to Figure 16, an electronic device 20 provided by an embodiment of the present application, the electronic device 20 includes a housing 21 and the camera module 110 of any of the above embodiments, and the camera module 110 is installed in the housing 21.

[0250] The above electronic device 20 with the camera module 110 is beneficial to improving the image quality and the thinning design of the overall structure of the camera module 110. The viewing length has a high relative brightness, and can accurately capture and identify light and image positions.

[0251] The electronic device 20 of the embodiment of the present application includes, but is not limited to, information terminal devices such as cameras, dash cams, smart phones, personal digital assistants (PDAs), tablet computers, personal computers (PCs), smart wearable devices, or electronic devices with a photographing function.

[0252] Specifically, in Figure 16 the shown embodiment, the electronic device 20 is a mobile phone, and the camera module 110 is a front camera of the electronic device 20. It can be understood that in other embodiments, the camera module 110 can be disposed at any place of the electronic device 20 to achieve the effect that the camera module 110 is used for photographing in the foregoing embodiments.

[0253] Please refer to Figure 17 , a vehicle 100 provided by an embodiment of the present application, includes a vehicle body 130 and the camera module 110 of the above embodiment, and the camera module 110 is disposed on the vehicle body 130 to obtain environmental information around the vehicle body 130.

[0254] The above vehicle 100 with the camera module 110 is beneficial to improving the image quality and the thinning design of the overall structure of the camera module 110. The viewing length has a high relative brightness, and can accurately capture and identify light and image positions.

[0255] Specifically, in Figure 17 the shown embodiment, the camera module 110 can be a front camera of the vehicle 100, can be a camera in the ADAS (Advanced Driver Assistant System) of the vehicle 100, can be a dash cam of the vehicle 100, or can be a monitoring and security camera of the vehicle 100. The number of the camera modules 110 can be one, can be two, or can be more than two. The environmental information around the vehicle body 130 includes, but is not limited to, road surface and road sign information of the lane, parking space information of the parking lot, obstacle information around the vehicle body 130, etc.

[0256] In addition, the imaging module 110 is also used in medical devices and in infrared imaging devices. Please also combine with Figure 15 , in one embodiment, the optical signal is an infrared optical signal.

[0257] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "certain embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0258] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An optical imaging system, characterized in that, There are three lenses with refractive power in total. In the order from the object side to the image side along the optical axis, the optical imaging system includes: A first lens with positive refractive power, and the object side surface of the first lens is convex near the optical axis. A second lens with refractive power, and the image side surface of the second lens is convex near the circumference. A third lens with refractive power, the image side surface of the third lens is concave near the optical axis, the image side surface of the third lens is convex near the circumference, both the object side surface and the image side surface of the third lens are aspherical surfaces, and at least one of the object side surface and the image side surface of the third lens is provided with at least one inflection point. The optical imaging system further satisfies the following relational expressions: 55.0deg < FOV / FNO < 71.0deg; 1.03 ≤ RI / |f3|*SD32 < 67.0; Wherein, FOV represents the object-side field of view angle corresponding to the largest imaging circle on the imaging surface of the optical imaging system, FNO represents the f-number of the optical imaging system, RI represents the relative illuminance of the imaging circle on the imaging surface of the optical imaging system at a radius of 2.3 mm, f3 represents the focal length of the third lens, and SD32 represents the perpendicular distance from the maximum effective diameter of the image side surface of the third lens to the optical axis.

2. The optical imaging system according to claim 1, wherein The optical imaging system satisfies the following relational expression: 0.74 < TTL / (IMGH*2) < 0.91; Wherein, TTL represents the distance on the optical axis from the object side surface of the first lens to the imaging surface, and IMGH represents the radius of the largest imaging circle on the imaging surface of the optical imaging system.

3. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies the following relational expression: 0.43 ≤ |R21| / |f2| ≤ 7.60; Wherein, R21 represents the curvature radius of the object side surface of the second lens at the optical axis, and f2 represents the focal length of the second lens.

4. The optical imaging system according to claim 1, wherein The optical imaging system satisfies the following relational expression: 0.24 ≤ |SLP31| / ET1 < 193.0; Wherein, SLP31 represents the angle formed between the tangent line at the maximum effective diameter of the object side surface of the third lens and the axis perpendicular to the optical axis, and ET1 represents the distance in the optical axis direction from the maximum effective diameter of the object side surface of the first lens to the maximum effective diameter of the image side surface of the first lens.

5. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies the following relational expression: 0.3 < f1 / f12 < 2.7; Wherein, f1 represents the focal length of the first lens, and f12 represents the combined focal length of the first lens and the second lens.

6. The optical imaging system according to claim 1, wherein, The optical imaging system satisfies the following relational expression: 0.6 < ET23 / ET12 < 11.0; Wherein, ET23 represents the distance in the optical axis direction from the maximum effective diameter of the image side surface of the second lens to the maximum effective diameter of the object side surface of the third lens, and ET12 represents the distance in the optical axis direction from the maximum effective diameter of the image side surface of the first lens to the maximum effective diameter of the object side surface of the second lens.

7. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies the following relational expression: 0.7 < BF / BF32 < 0.95; Wherein, BF represents the minimum distance between the image side of the third lens and the imaging surface in the optical axis direction, and BF32 represents the distance between the maximum effective diameter position of the image side of the third lens and the imaging surface in the optical axis direction.

8. An imaging module, characterized in that, The imaging module includes: a photosensitive element; and the optical imaging system according to any one of claims 1-7, wherein the photosensitive element is mounted on the image side of the optical imaging system, and the photosensitive element is configured to convert the optical signal that passes through the optical imaging system and reaches the imaging surface into an electrical signal.

9. An electronic device, characterized in that, The electronic device includes: a housing; and the imaging module according to claim 8, wherein the imaging module is mounted in the housing.

10. A vehicle, characterized in that, including: a vehicle body; and the imaging module according to claim 8, wherein the imaging module is disposed on the vehicle body to obtain the environmental information around the vehicle body.

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