Optical lens, camera module and terminal equipment

Abstract

The invention discloses an optical lens, a camera module and a terminal device, and the optical lens comprises four lenses with refractive power, and the four lenses sequentially comprise the first lens with negative refractive power, the object side surface of the first lens is a concave surface at a paraxial position, and the image side surface of the first lens is a convex surface at a paraxial position from an object side to an image side along an optical axis; the second lens has positive refractive power, the object side surface of the second lens is a convex surface in a paraxial region, and the image side surface of the second lens is a concave surface in a paraxial region; the third lens has positive refractive power, the object side surface of the third lens is a concave surface in a paraxial region, and the image side surface of the third lens is a convex surface in a paraxial region; the fourth lens has negative refractive power, the object side surface of the fourth lens is a convex surface in a paraxial region, and the image side surface of the fourth lens is a concave surface in a paraxial region; the optical lens satisfies the following relational expressions: 65 DEG tilt; a FOVlt; the angle is 75 degrees, and the tilt is 1.2 degrees; imgH / Flt; and 1.4. The optical lens provided by the invention can be light, thin and short in total length, and has excellent imaging quality.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and particularly to an optical lens, a camera module, and a terminal device. Background Art

[0002] With the continuous improvement of people's requirements for driving experience, in-vehicle application optical lenses are increasingly used in intelligent driving, and the status of in-vehicle optical lenses in the automotive-related industry has been continuously improved, including in-vehicle monitoring lenses.

[0003] Due to its special use environment, in-vehicle monitoring lenses generally require features such as a large field of view, a large aperture, day-night confocal, and miniaturization to achieve high-definition imaging of in-vehicle images and out-of-vehicle images. However, currently, conventional in-vehicle monitoring lenses have a small field of view and cannot achieve all-weather high-definition imaging, and thus cannot well meet the requirements of in-vehicle scene monitoring. Summary of the Invention

[0004] In view of the above, it is necessary to provide an optical lens, a camera module, and a terminal device that can have a relatively large field of view angle and relatively high imaging quality.

[0005] To achieve the above object, in a first aspect, this application discloses an optical lens. There are a total of four lenses with refractive power in the optical lens. The four lenses are arranged along the optical axis from the object side to the image side in sequence and include: a first lens with negative refractive power, the object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis; a second lens with positive refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is concave near the optical axis; a third lens with positive refractive power, the object side surface of the third lens is concave near the optical axis, and the image side surface of the third lens is convex near the optical axis; a fourth lens with negative refractive power, the object side surface of the fourth lens is convex near the optical axis, and the image side surface of the fourth lens is concave near the optical axis. The optical lens satisfies the following relational expressions: 65° < FOV < 75°, 1.2 < ImgH / F < 1.4; where FOV is the maximum field of view angle of the optical lens, ImgH is the diameter of the largest effective imaging circle on the imaging surface of the optical lens, and F is the effective focal length of the optical lens.

[0006] When the incident light passes through the first lens with negative refractive power, it can effectively couple the light of a larger field of view into the optical lens. The surface design of the object side and image side of the first lens are concave and convex respectively at the near optical axis, which is conducive to increasing the field of view of the optical lens and shortening the total optical length of the optical lens. The second lens has positive refractive power, and the object side of the second lens is set as a convex surface at the near optical axis, and the image side is set as a concave surface at the near optical axis, which helps to reduce the incident angle of the light on the object side and the image side of the second lens, reduce the reflection of the light on the surface of the lens, and can also correct aberrations. The third lens has positive refractive power, and the object side of the third lens is set as a concave surface at the near optical axis, and the image side is set as a convex surface at the near optical axis, which is conducive to the reasonable distribution of the refractive power of the optical lens, so that the amplitude of the overall refractive power of the optical lens moving toward the object side is reduced, which helps to shorten the total optical length of the optical lens and realize the design requirements of miniaturization. With the fourth lens having negative refractive power, the field curvature and astigmatism of the optical lens can be corrected well, and it can match the photosensitive chip with a large principal light angle, thereby improving the imaging quality. By setting the object side of the fourth lens as a convex surface at the near optical axis and the image side as a concave surface at the near optical axis, the total optical length of the optical lens can be further shortened, making the structure of the four lenses more compact. When the FOV is between 65° and 75°, the optical lens has a larger field of view, which is conducive to the optical lens being able to obtain more scene content, and can well meet the needs of in-vehicle scene monitoring. When ImgH / F is between 1.2 and 1.4, the distortion produced by the optical lens can be effectively corrected, thereby reducing the manufacturing difficulty of the optical lens while improving the imaging quality of the optical lens; in addition, it can help control the focal length of the optical lens within a reasonable range, and ensure that the optical lens has sufficient light receiving area and sufficient field of view angle, thereby simultaneously meeting the characteristics of a large field of view angle and a large image surface.

[0007] In a second aspect, the present application discloses a camera module, the camera module comprising a photosensitive chip and an optical lens as described in the first aspect, the photosensitive chip being arranged on the image side of the optical lens. The camera module having the optical lens can realize a miniaturized design of the optical lens, and at the same time enables the optical lens to have the characteristics of a large field of view angle and a large image plane, thereby improving the imaging quality of the optical lens.

[0008] In a third aspect, the present application discloses a terminal device, comprising a housing and a camera module as described in the second aspect, wherein the camera module is arranged in the housing. The electronic device having the camera module realizes a miniaturized design of an optical lens, and at the same time enables the optical lens to have the characteristics of a large image plane, thereby improving the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1It is a schematic diagram of the structure of the optical lens disclosed in the first embodiment of the present application.

[0010] Figure 2 It is a longitudinal spherical aberration curve diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the first embodiment of the present application.

[0011] Figure 3 It is a schematic diagram of the structure of the optical lens disclosed in the second embodiment of the present application.

[0012] Figure 4 It is a longitudinal spherical aberration curve graph (mm), astigmatism curve graph (mm) and distortion curve graph (%) of the optical lens disclosed in the second embodiment of the present application.

[0013] Figure 5 It is a schematic diagram of the structure of the optical lens disclosed in the third embodiment of the present application.

[0014] Figure 6 It is a longitudinal spherical aberration curve diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the third embodiment of the present application.

[0015] Figure 7 It is a schematic diagram of the structure of the optical lens disclosed in the fourth embodiment of the present application.

[0016] Figure 8 It is a longitudinal spherical aberration curve graph (mm), astigmatism curve graph (mm) and distortion curve graph (%) of the optical lens disclosed in the fourth embodiment of the present application.

[0017] Fig. 9 It is a schematic diagram of the structure of the optical lens disclosed in the fifth embodiment of the present application.

[0018] Fig.10 It is a longitudinal spherical aberration curve graph (mm), astigmatism curve graph (mm) and distortion curve graph (%) of the optical lens disclosed in the fifth embodiment of the present application.

[0019] Fig.11 It is a schematic diagram of the structure of the optical lens disclosed in the sixth embodiment of the present application.

[0020] Fig.12 It is a longitudinal spherical aberration curve graph (mm), astigmatism curve graph (mm) and distortion curve graph (%) of the optical lens disclosed in the sixth embodiment of the present application.

[0021] Fig.13 It is a schematic diagram of the structure of the optical lens disclosed in the seventh embodiment of the present application.

[0022] Fig.14It is a longitudinal spherical aberration curve graph (mm), astigmatism curve graph (mm) and distortion curve graph (%) of the optical lens disclosed in the seventh embodiment of the present application.

[0023] Fig.15 It is a schematic diagram of the structure of the optical lens disclosed in the eighth embodiment of the present application.

[0024] Fig.16 It is a longitudinal spherical aberration curve graph (mm), astigmatism curve graph (mm) and distortion curve graph (%) of the optical lens disclosed in the eighth embodiment of the present application.

[0025] Fig.17 It is a structural schematic diagram of the camera module disclosed in this application.

[0026] Fig.18 It is a schematic diagram of the structure of the terminal device disclosed in this application. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0028] See also Figure 1 In the first aspect of the present application, an optical lens 100 is disclosed. There are four lenses with refractive power in the optical lens 100. The four lenses include a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in order from the object side to the image side along the optical axis. When imaging, light enters the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 in order from the object side of the first lens L1 and is finally imaged on the imaging surface IMG of the optical lens 100.

[0029] The first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive refractive power, and the fourth lens L4 has negative refractive power. The object side surface S1 of the first lens L1 is concave at the near optical axis O, and the image side surface S2 of the first lens L1 is convex at the near optical axis O; the object side surface S3 of the second lens L2 is convex at the near optical axis O, and the image side surface S4 of the second lens L2 is concave at the near optical axis O; the object side surface S5 of the third lens L3 is concave at the near optical axis O, and the image side surface S6 of the third lens L3 is convex at the near optical axis O; the object side surface S7 of the fourth lens L4 is convex at the near optical axis O, and the image side surface S8 of the fourth lens L4 is concave at the near optical axis O.

[0030] In the optical lens 100 provided by the present application, when incident light passes through the first lens L1 with negative refractive power, it can effectively couple light in a larger field of view range into the optical lens. Combining with the surface shape design that the object side S1 and the image side S2 of the first lens L1 are concave and convex respectively near the optical axis O is conducive to increasing the field of view angle of the optical lens 100 and shortening the overall optical length of the optical lens 100. The second lens L2 has positive refractive power, and the object side S3 of the second lens L2 is set as a convex surface near the optical axis, and the image side S4 of the second lens L2 is set as a concave surface near the optical axis O, which helps to reduce the incident angle of light on the object side S3 of the second lens L2 and the image side S4 of the second lens L2, reduce the reflection of light on the surface of the lens, and can also correct aberrations. The third lens L3 has positive refractive power, and the object side S5 of the third lens L3 is set as a concave surface near the optical axis O, and the image side S6 of the third lens L3 is set as a convex surface near the optical axis O, which is conducive to reasonably distributing the refractive power of the optical lens 100, so that the amplitude of the overall refractive power of the optical lens 100 moving towards the object side direction is reduced, which helps to shorten the overall optical length of the optical lens 100 and realize the design requirement of miniaturization. Matching with the fourth lens L4 with negative refractive power can better correct the field curvature and astigmatism of the optical lens 100 and can match with a photosensitive chip with a larger principal light angle, thereby improving the imaging quality. By setting the object side S7 of the fourth lens L4 as a convex surface near the optical axis O and the image side S8 of the fourth lens L4 as a concave surface near the optical axis O, the overall optical length of the optical lens 100 can be further shortened, making the structure of the four lenses more compact.

[0031] In some embodiments, the optical lens 100 satisfies the following relationship: 65° < FOV < 75°. Wherein, FOV is the maximum field of view angle of the optical lens 100. Specifically, FOV can be 67.5°, 69.5°, 72.6°, 72.5°, 69.5°, 71.8° or 71.9°, etc. When FOV is between 65° and 75°, the optical lens 100 has a larger field of view angle, which is conducive to the optical lens 100 being able to obtain more scene content and can well meet the requirements of in-vehicle scene monitoring.

[0032] In some embodiments, the optical lens 100 satisfies the following relationship: 1.2 < ImgH / F < 1.4. Here, ImgH is the diameter of the largest effective imaging circle on the imaging surface IMG of the optical lens 100, and F is the effective focal length of the optical lens 100. Specifically, ImgH / F can be 1.233, 1.329, 1.347, 1.288, 1.266, 1.321, etc. When ImgH / F is between 1.2 and 1.4, the distortion generated by the optical lens 100 can be effectively corrected, thereby improving the imaging quality of the optical lens 100 while reducing the manufacturing difficulty of the optical lens 100; in addition, it can help control the focal length of the optical lens 100 within a reasonable range, and ensure that the optical lens 100 has a sufficient light-receiving area and a sufficient field angle, so as to simultaneously meet the characteristics of a large field angle and a large image plane.

[0033] In some embodiments, the optical lens 100 can be applied to electronic devices such as mobile phones, tablets, dash cams, and security monitors. Then, the materials of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 can be selected as plastics, so that while the optical lens 100 has good optical effects, the optical lens 100 has good portability. In addition, the plastic material is easier to process for the lens, thereby reducing the processing cost of the optical lens 100.

[0034] In some embodiments, the materials of the lenses in the optical lens 100 can also be glass. The lenses with glass materials can withstand higher or lower temperatures and have excellent optical effects and better stability.

[0035] In some embodiments, at least two lenses with different materials can also be provided in the optical lens 100. For example, a design combining glass lenses and plastic lenses can be adopted, but the specific configuration relationship can be determined according to actual needs and will not be enumerated here.

[0036] In some embodiments, the optical lens 100 further includes a stop STO. The stop STO can be an aperture stop or a field stop, and it can be arranged between the image side S4 of the second lens L2 and the object side S5 of the third lens L3. It can be understood that in other embodiments, the stop STO can also be arranged between the object side of the optical lens 100 and the object side S1 of the first lens L1, or the stop STO can also be arranged between the first lens L1 and the second lens L2. The specific setting can be adjusted according to the actual situation, and this embodiment does not make specific limitations on this.

[0037] In some embodiments, the optical lens 100 further includes a filter G1. For example, an infrared band-pass filter can be selected. The infrared band-pass filter is disposed between the image side S8 of the fourth lens L4 and the imaging surface IMG of the optical lens 100. The infrared band-pass filter allows infrared light within the expected wavelength range to pass through, while light of other wavelengths outside the range will be filtered out and cannot pass through, thereby avoiding interference light from affecting the normal imaging of infrared light and improving the imaging quality in low light.

[0038] In some embodiments, the optical lens 100 satisfies the following relationship: 1.7 < TTL / ImgH < 1.9. Wherein, TTL is the distance from the object side S1 of the first lens L1 to the imaging surface IMG of the optical lens 100 on the optical axis O, that is, the total optical length of the optical lens 100. Specifically, TTL / ImgH can be 1.761, 1.837, 1.788, 1.780, 1.809, 1.879, 1.802 or 1.807, etc. Thus, through the limitation of the above relationship and the reasonable configuration of the refractive power of each lens, the optical lens 100 can obtain good thinness and lightness, has good aberration balance and image quality improvement ability, and can support high-pixel photosensitive chips at the same time. In addition, ImgH can determine the size of the photosensitive chip. The larger ImgH is, the larger the maximum size of the photosensitive chip that can be supported is. When higher than the upper limit of the above relationship, although the optical lens 100 can obtain better aberration balance and resolution, as the photosensitive chip increases, the total optical length will be difficult to compress, resulting in a decrease in the thinness and lightness of the optical lens 100. When lower than the lower limit of the above relationship, the optical lens 100 will have good thinness and lightness, but the overall size being too small will greatly limit the balance of aberrations, the matching of the photosensitive chip, and the optimization of the resolution.

[0039] In some embodiments, the optical lens 100 satisfies the following relationship: 30° < FOV / FNO < 34°. Wherein, FNO is the f-number of the optical lens 100. Specifically, FOV / FNO can be 30.682°, 31.591°, 33°, 32.955°, 31.591°, 32.636° or 32.682°, etc. When the optical lens 100 satisfies the above relationship, it can reasonably control the field of view angle and the light passing amount of the optical lens 100, improve the distortion of the edge field of view, and prevent the light flux of the optical lens 100 from being too large. When higher than the upper limit of the above relationship, the field of view angle of the optical lens 100 is too large, resulting in too large distortion of the edge field of view, and the periphery of the image will appear distorted. In addition, it will also cause the f-number to be too small, resulting in too large a light passing amount of the optical lens 100, causing non-effective light to also reach the imaging surface IMG, resulting in aberrations such as spherical aberration and field curvature in the imaging (especially at the edge field of view), thereby leading to a decrease in the imaging performance of the optical lens 100; when lower than the lower limit of the above relationship, the light passing amount of the optical lens 100 is insufficient, and the clarity of the captured image decreases.

[0040] In some embodiments, the optical lens 100 satisfies the following relationship: 2.1 < TTL / F < 2.5. Specifically, TTL / F can be 2.171, 2.441, 2.409, 2.398, 2.330, 2.379, 2.382, 2.387, etc. When the optical lens 100 satisfies the above relationship, while enabling the optical lens 100 to have a reasonable focal length, the total length of the optical lens 100 can be controlled, which is beneficial to the miniaturization design of the optical lens 100. If it is lower than the lower limit of the above relationship, the focal length of the optical lens 100 is too long, which is not conducive to meeting the field of view angle range of the optical lens 100, resulting in a limited field of view of the optical lens 100 and less object space information obtained by the optical lens 100; if it is higher than the upper limit of the above relationship, the total optical length of the optical lens 100 is too large, which is not conducive to the miniaturization of the optical lens 100.

[0041] In some embodiments, the optical lens 100 satisfies the following relationship: 1.4 < SD11 / SD21 < 1.7. Wherein, SD11 is the maximum effective aperture of the object side S1 of the first lens L1, and SD21 is the maximum effective aperture of the object side S3 of the second lens L2. Specifically, SD11 / SD21 can be 1.471, 1.498, 1.498, 1.498, 1.498, 1.543, 1.604, 1.605, etc. When the optical lens 100 satisfies the above relationship, it can effectively prevent the situation where the maximum effective apertures of the object side S1 of the first lens L1 and the object side S3 of the second lens L2 differ too much, which is beneficial to the processing and forming of the first lens L1 and the second lens L2, and improves the assembly stability of each lens of the optical lens 100. In addition, satisfying this relationship can also reduce the incident angle of the marginal outgoing light of the first lens L1 entering the object side S3 of the second lens L2, which is beneficial to reducing the tilt tolerance sensitivity of the second lens L2. When the ratio is higher than the upper limit or lower than the lower limit, the maximum effective apertures of the object side S1 of the first lens L1 and the object side S3 of the second lens L2 differ too much, resulting in a large step difference between the first lens L1 and the second lens L2, which increases the deflection angle of the marginal light, resulting in an increased risk of ghost image generation, and there is stray light in the optical lens 100, which is likely to reduce the imaging quality of the optical lens 100.

[0042] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.9 < SD22 / SD31 < 1.1. Here, SD22 is the maximum effective aperture of the image side S4 of the second lens L2, and SD31 is the maximum effective aperture of the object side S5 of the third lens L3. Specifically, SD22 / SD31 can be 1.053, 1.079, 1.091, 0.917, 1.082, 0.959, 0.961, etc. When the optical lens 100 satisfies the above relational expression, the angle of the external field light incident on the image side S4 of the second lens L2 can be reasonably controlled, and then the angle of the light incident on the imaging surface IMG can be adjusted within a reasonable range, so that the height drop range of the external field light is appropriate, and the sizes of the maximum effective apertures of the object side and the image side of each lens are appropriate, which is beneficial to the miniaturization and thinness of the optical lens 100 while reasonably restricting the principal ray incident angle, and then the matching between the optical lens 100 and the photosensitive chip can be ensured; at the same time, partial occlusion of the marginal light is prevented, and then excessive vignetting is prevented from being introduced, ensuring that the diffraction limit is within a reasonable range. When it is higher than the upper limit of the conditional expression, the height of the external field light drops too fast, and the introduced vignetting is too large, which is not conducive to maintaining a relatively high relative illuminance in the external field; when it is lower than the lower limit of the conditional expression, the height of the external field light rises, which easily causes the sagittal height at the maximum effective aperture of the image side S4 of the second lens L2 and the object side S5 of the third lens L3 to be too large, resulting in an excessive curvature of the surface shapes of the image side S4 of the second lens L2 and the object side S5 of the third lens L3, which has an adverse impact on the tolerance sensitivity of the optical lens 100.

[0043] In some embodiments, the optical lens 100 satisfies the following relational expression: 1 < SD41 / SD32 < 1.5. Here, SD41 is the maximum effective aperture of the object side S7 of the fourth lens L4, and SD32 is the maximum effective aperture of the image side S6 of the third lens L3. Specifically, SD41 / SD32 can be 1.433, 1.084, 1.325, 1.173, 1.17, etc. When the optical lens 100 satisfies the above relational expression, the problem that the surface shape of the fourth lens L4 is too curved, resulting in an increase in the processing difficulty of the fourth lens L4, can be effectively avoided. At the same time, the problem that a large-angle light beam cannot enter the optical lens 100, resulting in poor imaging quality of the optical lens 100, can also be effectively avoided. The risk of ghosting in the optical lens 100 caused by the surface of the fourth lens L4 being too flat can also be effectively avoided; when it is lower than the lower limit of the conditional expression, the surface shape of the fourth lens L4 is too curved, which will lead to an increase in the processing difficulty of the fourth lens L4 and also cause a large-angle light beam not to enter the optical lens 100, resulting in poor imaging quality; when it is higher than the upper limit of the conditional expression, the surface of the object side S7 of the fourth lens L4 is too flat, which will increase the risk of ghosting in the optical lens 100.

[0044] In some embodiments, the optical lens 100 satisfies the following relational expression: -4 < (F1 + F2) / F < -1. Wherein, F1 is the effective focal length of the first lens L1, and F2 is the effective focal length of the second lens L2. Specifically, (F1 + F2) / F can be -3.040, -1.714, -1.701, -1.708, -1.647, -1.908, -1.446, or -1.409, etc. When the optical lens 100 satisfies the above relational expression, it is beneficial for the refractive powers of the first lens L1 and the second lens L2 to be properly matched in the optical lens 100, which is beneficial for large-angle light to enter the optical lens 100 and thus obtain a larger field of view. The surface shape design of the first lens L1 is more simple and flexible, enabling the first lens L1 to support a larger field of view angle and a large aperture. At the same time, it is also beneficial for the second lens L2 to converge the light incident from the first lens L1 to the optical lens 100, delay the incident angle of the light, reduce aberration, and simplify the balance of aberration correction and imaging quality of the overall optical lens 100.

[0045] In some embodiments, the optical lens 100 satisfies the following relational expression: -5 < F1 / F < -2. Specifically, F1 / F can be -4.607, -2.946, -2.864, -2.746, -3.441, -2.809, or -2.756, etc. When the optical lens 100 satisfies the above relational expression, the ratio of the focal length of the first lens L1 to the focal length of the optical lens 100 can be reasonably configured. For the entire optical lens 100, the refractive power of the first lens L1 will not be too strong, avoiding introducing too much spherical aberration, and enabling the optical lens 100 to have good imaging quality.

[0046] In some embodiments, the optical lens 100 satisfies the following relational expression: 2 < F1 / F4 < 6.1. Wherein, F4 is the effective focal length of the fourth lens L4. Specifically, F1 / F4 can be 5.930, 2.416, 2.472, 2.435, 3.374, 3.799, 3.694, or 3.637, etc. By reasonably setting the focal length relationship between the first and last lenses in the optical lens 100, while ensuring that as much light as possible enters the optical lens 100, the area of the light entering the imaging surface IMG is increased, and the balance between the field of view of the optical lens 100 and the size of the imaging surface IMG is better achieved.

[0047] In some embodiments, the optical lens 100 satisfies the following relationship: 3 < ∑CT / ∑AT < 6. Here, ∑CT is the sum of the thicknesses of all the lenses among the first lens L1 to the fourth lens L4 on the optical axis O, and ∑AT is the sum of the air gaps between adjacent lenses among the first lens L1 to the fourth lens L4. Specifically, ∑CT / ∑AT can be 4.998, 3.155, 3.293, 3.923, 5.739, 4.944, 4.603, 4.624, etc. When the optical lens 100 satisfies the above relationship, the overall structure of the optical lens 100 can be made more compact, which is conducive to shortening the total length of the optical lens 100, thereby realizing the miniaturization of the optical lens 100. When it is higher than the upper limit of the conditional formula, the total thickness of the first lens L1 to the fourth lens L4 on the optical axis O is too large, which is not conducive to the miniaturization of the optical lens 100; when it is lower than the lower limit of the conditional formula, the sum of the air gaps between adjacent lenses among the first lens L1 to the fourth lens L4 increases, and the field curvature increases, which is not conducive to improving the imaging quality of the optical lens 100.

[0048] In some embodiments, the optical lens 100 satisfies the following relationship: 2 < CT3 / CT4 < 3.4. Here, CT3 is the thickness of the third lens L3 on the optical axis O, and CT4 is the thickness of the fourth lens L4 on the optical axis O. Specifically, CT3 / CT4 can be 3.19, 3.12, 2.994, 2.787, 3.18, 2.25, 2.823, 2.871, etc. When the optical lens 100 satisfies the above relationship, it is conducive to ensuring that the uniformity of the thickness of the third lens L3 and the thickness of the fourth lens L4 on the optical axis O is within a reasonable range, thereby improving the assembly stability of the optical lens 100; when it is lower than the lower limit of the conditional formula, the thickness of the fourth lens L4 relative to the third lens L3 on the optical axis O is too large, resulting in the fourth lens L4 being too thick and having an adverse effect on the assembly stability of the optical lens 100, and it is not conducive to realizing the miniaturization and lightweight design of the optical lens 100; when it is higher than the upper limit of the conditional formula, the thickness of the fourth lens L4 relative to the third lens L3 on the optical axis O is too small, resulting in the fourth lens L4 being too thin and having an adverse effect on the assembly stability of the optical lens 100, and the fourth lens L4 being too thin increases the difficulty of production and processing.

[0049] In some embodiments, the optical lens 100 satisfies the following relational expression: 4 < TTL / CT3 < 4.4. Wherein, TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100 on the optical axis O, and CT3 is the thickness of the third lens L3 on the optical axis O. Specifically, TTL / CT3 can be 4.088, 4.353, 4.111, 4.296, 4.154, 4.355, 4.094, 4.073, etc. When the optical lens 100 satisfies the above relational expression, it is beneficial to improve the structural compactness of the optical lens 100, shorten the total length of the optical lens 100, and at the same time is beneficial to reducing the decentration sensitivity of the third lens L3, thereby facilitating the production and assembly of the optical lens 100. When it is higher than the upper limit of the conditional expression, the total length of the optical lens 100 is too long, which is not conducive to realizing miniaturized design and reducing production costs; when it is lower than the lower limit of the conditional expression, the central thickness of the third lens L3 is too large, resulting in an increase in the decentration sensitivity of the third lens L3, which is not conducive to the molding and assembly of the third lens L3.

[0050] In some embodiments, the optical lens 100 satisfies the following relational expression: 2 < F2 / CT2 < 3.7. Wherein, CT2 is the thickness of the second lens L2 on the optical axis O. Specifically, F2 / CT2 can be 3.594, 3.009, 3.082, 2.593, 2.367, 3.489, 3.086, 3.04, etc. When the optical lens 100 satisfies the above relational expression, the focal length of the second lens L2 and the thickness of the second lens L2 on the optical axis O are reasonably configured, and the aberrations of the optical lens 100 can be effectively corrected, improving the imaging quality. When it is lower than the lower limit of the conditional expression, the effective focal length of the second lens L2 is too small, resulting in too strong refractive power of the second lens L2, and large aberrations are likely to occur; when it is higher than the upper limit of the conditional expression, the effective focal length of the second lens L2 is too large, which is not conducive to reasonably distributing the refractive power of the second lens L2. Due to insufficient refractive power, high-order spherical aberration, coma, etc. are likely to occur at the second lens L2, thereby affecting the imaging quality of the optical lens 100.

[0051] In some embodiments, the optical lens 100 satisfies the following relational expression: -2 < R11 / R42 < -1. Wherein, R11 is the curvature radius of the object side surface S1 of the first lens L1 at the optical axis O, and R42 is the curvature radius of the image side surface S8 of the fourth lens L4 at the optical axis O. Specifically, R11 / R42 can be -1.749, -1.394, -1.534, -1.506, -1.872, -1.438, -1.790, -1.795, etc. When the optical lens 100 satisfies the above relational expression, the processing difficulty can be effectively reduced, and at the same time, the chromatic aberration balance ability and distortion balance ability of the optical lens 100 can be improved.

[0052] In some embodiments, the optical lens 100 satisfies the following relational expression: -7 < (R21 + R22) / (R21 - R22) < -2. Herein, R21 is the curvature radius of the object side surface S3 of the second lens L2 at the optical axis O, and R22 is the curvature radius of the image side surface S4 of the second lens L2 at the optical axis O. Specifically, (R21 + R22) / (R21 - R22) can be -6.324, -3.512, -2.205, -2.243, -4.872, -3.416, -3.373, etc. When the optical lens 100 satisfies the above relational expression, it can effectively control the bending degree and the trend of the thickness ratio of the object side surface S3 and the image side surface S4 of the second lens L2, so as to limit the shape change of the second lens L2. In this way, not only can the spherical aberration and astigmatism of the optical lens 100 be corrected, and the imaging quality of the optical lens 100 be improved; at the same time, it is also beneficial to reduce the surface type complexity of the second lens L2, improve the processability of the second lens L2, so as to reduce the risk of the imaging quality of the optical lens 100 decreasing due to poor processing and forming, thereby ensuring the imaging quality of the optical lens 100. When it is higher than the upper limit of the conditional expression, the surface type of the image side surface S4 of the second lens L2 at the near optical axis O is too smooth, making it difficult to correct the aberration of the optical lens 100, and the astigmatism of the outer field of view is too large, resulting in a decrease in the imaging quality of the optical lens 100. When it is lower than the lower limit of the conditional expression, the bending degree of the surface type of the image side surface S4 of the second lens L2 at the near optical axis O is too large, which is likely to cause poor processing and forming, thereby affecting the imaging quality of the optical lens 100.

[0053] In some embodiments, the optical lens 100 satisfies the following relational expression: 4 < R41 / R42 < 20. Herein, R41 is the curvature radius of the object side surface S7 of the fourth lens L4 at the optical axis O. Specifically, R41 / R42 can be 7.708, 4.997, 4.115, 4.154, 6.911, 11.468, 15.704, 16.205, etc. When the optical lens 100 satisfies the above relational expression, it is beneficial to correct the aberration generated by the optical lens 100, make the refractive power configuration of each lens of the optical lens 100 uniform in the direction perpendicular to the optical axis O, greatly correct the distortion and aberration generated by the front lens, and at the same time avoid excessive bending of the fourth lens L4, which is easy to form and manufacture.

[0054] In some embodiments, the optical lens 100 satisfies the following relationship: 0.8 < CT1 / CT4 < 1.6. Here, CT1 is the thickness of the first lens L1 on the optical axis O. Specifically, CT1 / CT4 can be 1.053, 1.281, 1.143, 1.117, 1.505, 0.807, 1.064, 1.090, etc. When the optical lens 100 satisfies the above relationship, the thicknesses of the first lens L1 and the fourth lens L4 will be reasonably configured, so that the refractive power of the lenses in the optical lens 100 can be reasonably distributed, thereby effectively correcting the spherical aberration of the optical lens 100. At the same time, the thicknesses of the first lens L1 and the fourth lens L4 are relatively uniform, meeting the processing requirements.

[0055] In some embodiments, the optical lens 100 satisfies the following relationship: 1.2 < CT3 / CT2 < 1.6. Here, CT2 is the thickness of the second lens L2 on the optical axis O. Specifically, CT3 / CT2 can be 1.219, 1.369, 1.553, 1.252, 1.208, 1.243, 1.317, 1.323, etc. When the optical lens 100 satisfies the above relationship, it is beneficial to ensure that the uniformity of the thickness of the second lens L2 on the optical axis O and the thickness of the third lens L3 on the optical axis O is within a reasonable range, thereby improving the assembly stability of the optical lens 100, increasing the resolution of the optical lens 100, correcting the astigmatism of the optical lens 100, and improving the imaging clarity of the optical lens 100.

[0056] In some embodiments, the optical lens 100 satisfies the following relationship: 0.3 < CT23 / CT12 < 1.3. Here, CT23 is the distance between the image side S4 of the second lens L2 and the object side S5 of the third lens L3 on the optical axis O, and CT12 is the distance between the image side S2 of the first lens L1 and the object side S3 of the second lens L2 on the optical axis O. Specifically, CT23 / CT12 can be 1.011, 0.380, 0.646, 0.653, 1.234, 0.978, 0.951, 0.934, etc. When the optical lens 100 satisfies the above relationship, the distance between the first lens L1 and the second lens L2, and the distance between the second lens L2 and the third lens L3 can be greatly compressed, and the total length of the optical lens 100 can be effectively controlled, thereby achieving miniaturization, and at the same time, off-axis aberration can also be corrected.

[0057] In some embodiments, the optical lens 100 satisfies the following relationship: 52° < FOV * F / ImgH < 55°. Specifically, FOV * F / ImgH can be 54.761°, 52.313°, 53.884°, 53.810°, 53.972°, 54.876°, 54.335°, or 54.411°, etc. When the optical lens 100 satisfies the above relationship, while achieving a large field of view angle of the optical lens 100, it is also beneficial to ensure the image height of the optical lens 100, ensure the image plane size of the image on the imaging plane IMG, so that the optical lens 100 has an appropriate image plane size, and improves the brightness of the imaging plane IMG of the optical lens 100. When it is higher than the upper limit of the conditional expression, the image height of the optical lens 100 is smaller, resulting in too small an imaging size of the image, and it is difficult to match the imaging plane IMG of the optical lens 100 with the image sensor, so that the relative illuminance of the imaging plane IMG drops greatly, the brightness of the imaging plane IMG is darker, and the phenomenon of vignetting is easily found in the captured image, reducing the imaging quality; when it is lower than the lower limit of the conditional expression, the field of view angle of the optical lens 100 is smaller, resulting in a reduced field of view range captured by the optical lens 100, which is not conducive to achieving wide-angleization.

[0058] In some embodiments, the optical lens 100 satisfies the following relationship: 1.7 < ImgH / (F * tan(FOV / 2)) < 2. Specifically, ImgH / (F * tan(FOV / 2)) can be 1.845, 1.915, 1.834, 1.838, 1.856, 1.826, 1.825, or 1.822, etc. When the optical lens 100 satisfies the above relationship, it can ensure that while shortening the overall optical length of the optical lens 100, it is also beneficial to correct the aberration of the optical lens 100, and helps to obtain an optical lens 100 with both miniaturization and good imaging quality; at the same time, it can also endow the optical lens 100 with large-angle and large-image-plane characteristics, so as to be able to obtain more scene content and enrich the imaging information of the optical lens 100. When exceeding the upper limit of the above relationship, the field of view angle of the optical lens 100 is too small, reducing the field of view range of the optical lens 100, resulting in incomplete imaging information of the optical lens 100, affecting the shooting quality of the optical lens 100, or the focal length of the optical lens 100 is too long and it is difficult to compress the overall optical length of the optical lens 100, resulting in an increase in the volume of the optical lens 100, which is not conducive to the optical lens 100 meeting the requirements of miniaturized design. When lower than the lower limit of the above relationship, the field of view angle of the optical lens 100 is too large, causing excessive distortion of the outer field of view, resulting in a distortion phenomenon in the periphery of the image, reducing the imaging performance of the optical lens 100.

[0059] In some embodiments, the optical lens 100 satisfies the following relationship: 2 < FNO < 2.3. Here, FNO is the f-number of the optical lens 100. Specifically, FNO can be 2.05, 2.1, 2.15, 2.2, 2.25, etc. When the optical lens 100 satisfies the above relationship, it has the characteristic of a large aperture. The optical lens 100 has sufficient light input, which can make the images captured by the optical lens 100 clearer, so that it can be applicable to object space scenes with low light brightness such as shooting high-quality night scenes and starry skies. In addition, it can also avoid introducing excessive aberrations, making the optical lens 100 achieve an overall balance.

[0060] In some embodiments, the optical lens 100 satisfies the following relationship: 1 < F / F2 < 1.7. Specifically, F / F2 can be 1.567, 1.232, 1.163, 1.156, 1.099, 1.533, 1.363, 1.347, etc. When the optical lens 100 satisfies the above relationship, it is beneficial to reduce the deflection angle of light in the second lens L2, and at the same time, the positive refractive power provided by the second lens L2 can effectively balance the spherical aberration of the optical lens 100, effectively correct the aberration to achieve good imaging quality, and it is also beneficial to reasonably configure the central thickness of the second lens L2, thereby shortening the total length of the optical lens 100. In addition, it is also beneficial to expand the field of view angle of the optical lens 100.

[0061] In some embodiments, the optical lens 100 satisfies the following relationship: 1.2 < F / F3 < 2. Here, F3 is the effective focal length of the third lens L3. Specifically, F / F3 can be 1.951, 1.279, 1.297, 1.338, 1.712, 1.826, 1.828, 1.827, etc. When the optical lens 100 satisfies the above relationship, it is beneficial to balance the spherical aberration generated by the second lens L2 and can effectively correct the off-axis aberration of the optical lens 100, thereby improving the imaging quality.

[0062] In some embodiments, the optical lens 100 satisfies the following relational expression: -1.4 < F / F4 < -0.8. Herein, F4 is the effective focal length of the fourth lens L4. Specifically, F / F4 can be -1.287, -0.82, -0.863, -0.850, -1.229, -1.104, -1.315, -1.320, etc. When the optical lens 100 satisfies the above relational expression, the fourth lens L4 provides a part of the negative refractive power for the optical lens 100, which can be used to adjust the overall refractive power of the optical lens 100. The fourth lens L4 and the first lens L1, the second lens L2, and the third lens L3 form a quasi-Gaussian structure, which can balance the distortion generated by the first lens L1, the second lens L2, and the third lens L3, and avoid high-order aberrations caused by too large refractive index, thereby improving the imaging quality of the optical lens 100. When it is lower than the lower limit of the conditional expression, the effective focal length of the optical lens 100 is too small, which is not conducive to meeting the long focal length telephoto characteristics. When it exceeds the upper limit of the above relational expression, the focal length of the fourth lens L4 is too large, it is difficult to balance the distortion generated by the first lens L1, the second lens L2, and the third lens L3, and the refractive index of the optical lens 100 is too large, which is likely to cause high-order aberrations.

[0063] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.4 < F2 / F3 < 3.2. Specifically, F2 / F3 can be 3.057, 1.576, 1.508, 1.546, 1.882, 2.801, 2.492, 2.460, etc. When the optical lens 100 satisfies the above relational expression, it can effectively control the contributions of the refractive powers of the second lens L2 and the third lens L3 to the optical lens 100, which is beneficial to correcting the off-axis coma of the optical lens 100. At the same time, it is also convenient to control the thicknesses of the lenses in the optical lens 100 and reduce the tolerance sensitivity of each lens. When it exceeds the upper limit of the above relational expression, the refractive power of the second lens L2 is insufficient, and it is difficult to tune the light angle passing through the second lens L2; when it is lower than the lower limit of the conditional expression, the refractive power of the third lens L3 is insufficient, which is not conducive to correcting the aberrations generated by the front-end first lens L1 and the second lens L2, and reduces the imaging quality.

[0064] In some embodiments, the optical lens 100 satisfies the following relationship: -3 < R21 / R32 < -1.5. Here, R21 is the curvature radius of the object side surface S3 of the second lens L2 at the optical axis O, and R32 is the curvature radius of the image side surface S6 of the third lens L3 at the optical axis O. Specifically, R21 / R32 can be -2.545, -1.664, -1.920, -2.023, -2.385, -2.556, -2.517, -2.500, etc. When the optical lens 100 satisfies the above relationship, a more reasonable refractive power distribution can be provided, the curvature radii of the second lens L2 and the third lens L3 can be effectively controlled, a surface shape with a gentle change can be maintained, the aberration of the optical lens 100 can be reasonably balanced, and the difficulty of the assembly process caused by too large a difference in the refractive powers of the lenses in the optical lens 100 can be avoided.

[0065] In some embodiments, the optical lens 100 satisfies the following relationship: -1.65 < R22 / R31 < -0.45. Here, R31 is the curvature radius of the object side surface S5 of the third lens L3 at the optical axis O. Specifically, R22 / R31 can be -0.773, -0.562, -1.292, -1.461, -1.546, -1.021, -0.783, -0.774, etc. When the optical lens 100 satisfies the above relationship, the curvature radii of the image side surface S4 of the second lens L2 and the object side surface S5 of the third lens L3 at the optical axis O can be reasonably configured, so as to effectively reduce the deflection angle of the light when it exits the first lens L1 and then enters the second lens L2, reduce the sensitivity of the optical lens 100, and effectively suppress the generation of ghost images.

[0066] In some embodiments, the optical lens 100 satisfies the following relationship: -1 < R11 / F < -0.6. Here, R11 is the curvature radius of the object side surface S1 of the first lens L1 at the optical axis O. Specifically, R11 / F can be -0.738, -0.845, -0.821, -0.811, -0.747, -0.805, -0.807, etc. When the optical lens 100 satisfies the above relationship, the refractive power of the first lens L1 can be controlled within a reasonable range, which is beneficial to balancing the refractive power borne by the first lens L1 in the optical lens 100, and further beneficial to balancing the high-order coma of the optical lens 100, so that the optical lens 100 has good imaging quality.

[0067] In some embodiments, the optical lens 100 satisfies the following relationship: 1 < SD11 / ImgH < 1.1. Specifically, 1 < SD11 / ImgH < 1.1 can be 1.085, 1.040, 1.036, etc. When the optical lens 100 satisfies the above relationship, the first lens L1 matches the size of the half image height (i.e., half of the image height corresponding to the maximum field of view angle of the optical lens 100), which is beneficial for the optical lens 100 to form a folded periscope structure. If it exceeds the upper or lower limit of the above relationship, the maximum effective aperture of the first lens L1 is too large or too small, which will result in a large step difference between each lens and the imaging surface IMG, and is not conducive to the assembly of the optical lens 100 and the bearing design between each lens.

[0068] In some embodiments, the optical lens 100 satisfies the following relationship: 1.5 < TTL / ∑CT < 1.8. Specifically, TTL / ∑CT can be 1.659, 1.769, 1.742, 1.679, 1.588, 1.670, 1.644, 1.640, etc. When the optical lens 100 satisfies the above relationship, it can effectively control the proportion of the central thickness of each lens in the total length of the optical lens 100, so as to reasonably configure the air gap between each lens and the distance from the fourth lens L4 to the imaging surface IMG. Thus, on the one hand, it can effectively control the distortion of the optical lens 100, so that the optical lens 100 has good distortion performance, thereby improving the imaging quality of the optical lens 100. On the other hand, it can also improve the spatial compactness of the optical lens 100 to shorten the total length of the optical lens 100, thereby realizing the miniaturization of the optical lens 100.

[0069] In some embodiments, the optical lens 100 satisfies the following relationship: 1.5 < R12 / R11 < 2.5. Wherein, R12 is the curvature radius of the image side S2 of the first lens L1 at the optical axis O. Specifically, R12 / R11 can be 1.5448, 2.3522, 2.4791, 1.8338, 2.4131, etc. When the optical lens 100 satisfies the above relationship, it is beneficial to control the shape and bending degree of the first lens L1, so as to effectively reduce the aberration introduction value of the incident light, promote the aberration balance of the optical lens 100. At the same time, it can also reduce the processing difficulty of the first lens L1, which is beneficial to the manufacturing and forming of the first lens L1, and improve the processing technology of the optical lens 100.

[0070] In some embodiments, the optical lens 100 satisfies the following relationship: 1 < R22 / R21 < 3. Specifically, R22 / R21 can be 1.3757, 1.7961, 2.6597, 2.6088, 2.6593, 1.5166, 1.8279, 1.8428, etc. When the optical lens 100 satisfies the above relationship, by adjusting the curvature radius of the second lens L2, the spherical aberration and astigmatism of the optical lens 100 can be effectively corrected. At the same time, the sensitivity of the second lens L2 can be reduced, the influence of the field curvature during the focusing process of the optical lens 100 at different object distances can be reduced, and the imaging quality can be improved.

[0071] In some embodiments, the optical lens 100 satisfies the following relationship: 3 < R31 / R32 < 6. Specifically, R31 / R32 can be 4.5297, 5.3200, 3.9524, 3.6123, 4.1040, 3.7953, 5.8796, 5.9517, etc. When the optical lens 100 satisfies the above relationship, in combination with the concave-convex surface type of the third lens L3, the curvature radius and surface type of the object side S5 and the image side S6 of the third lens L3 can be optimized, which is beneficial to the third lens L3 to reasonably cooperate with the negative refractive power of the first lens L1 and the positive refractive power of the second lens L2. Thus, the on-axis spherical aberration of the entire optical lens 100 is reduced. At the same time, it is beneficial to correct the optical path direction from the third lens L3 to the fourth lens L4, thereby facilitating the reduction of the generation of optical distortion.

[0072] The optical lens 100 of this embodiment will be described in detail below with specific parameters.

[0073] First Embodiment

[0074] The structural schematic diagram of the optical lens 100 disclosed in the first embodiment of the present application is as Figure 1 shown. The optical lens 100 includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a filter G1, and a protective glass G2, which are sequentially arranged along the optical axis O from the object side to the image side.

[0075] Further, the first lens L1 has a negative refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a positive refractive power, and the fourth lens L4 has a negative refractive power.

[0076] Furthermore, the object side S1 and the image side S2 of the first lens L1 are concave and convex surfaces respectively near the optical axis O; the object side S3 and the image side S4 of the second lens L2 are convex and concave surfaces respectively near the optical axis O; the object side S5 and the image side S6 of the third lens L3 are concave and convex surfaces respectively near the optical axis O; the object side S7 and the image side S8 of the fourth lens L4 are convex and concave surfaces respectively near the optical axis O.

[0077] Specifically, the elements from the object side to the image side along the optical axis O of the optical lens 100 are arranged in sequence from top to bottom in Table 1a. In the same lens, the surface with a smaller surface number is the object side of the lens, and the surface with a larger surface number is the image side of the lens, such as surface numbers 1 and 2 correspond to the object side surface S1 and image side surface S2 of the first lens L1, respectively. The Y radius in Table 1a is the radius of curvature of the object side surface or image side surface of the corresponding surface number at the near optical axis O. The first value in the "Thickness" parameter column of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side surface of the lens to the next surface on the optical axis O. The value of the aperture STO in the "Thickness" parameter column is the distance from the aperture STO to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis O) on the optical axis O. By default, the direction from the object side S1 of the first lens L1 to the image side of the last lens is the positive direction of the optical axis O. When the value is negative, it indicates that the aperture 102 is set on the image side of the vertex of the next surface. If the thickness of the aperture STO is a positive value, the aperture STO is on the object side of the vertex of the next surface. It can be understood that the units of the Y radius, thickness, focal length and Y aperture in Table 1a are all mm. And the reference wavelength of the refractive index and Abbe number of each lens in Table 1a is 588nm, and the reference wavelength of the focal length is 950nm.

[0078] Table 1a

[0079]

[0080] Table 1b

[0081] Surface number 1 2 6 7 8 9 K 0.0000E+00 0.0000E+00 5.5163E+00 -6.8961E-01 -4.3135E+01 -7.1020E-01 A3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -9.5899E-02 -8.5319E-02 A4 5.0294E-02 4.1102E-02 -5.2664E-02 1.5236E-01 3.3071E-02 -2.9601E-01 A5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -3.3717E-02 2.0559E-01 A6 -8.1704E-03 -7.1383E-03 -1.6943E-01 -8.0016E-02 3.9329E-02 8.2747E-03 A7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 2.9298E-03 -1.3262E-02 A8 9.8824E-04 2.5209E-04 5.5925E-01 6.1463E-02 -1.6007E-02 -3.0433E-02 A10 -3.0859E-05 8.5189E-05 -9.6253E-01 -5.0601E-02 5.5839E-03 1.4800E-02 A12 -5.5504E-07 -1.5722E-06 8.7423E-02 3.4235E-02 -1.4170E-03 -3.4860E-03 A14 -9.3380E-07 -3.4737E-06 1.3911E+00 -1.2697E-02 1.9108E-04 4.2963E-04 A16 1.2814E-07 3.6409E-07 -1.0028E+00 1.9130E-03 -9.8191E-06 -2.2048E-05

[0082] It should be noted that the aspheric coefficients of the image side or object side of the lens with an aspheric surface in the optical lens 100 are given in Table 1b. Among them, the serial numbers 1, 2, 6, 7, 8, and 9 respectively represent the object side S1, the image side S2, the object side S6, the image side S7, the object side S8, and the image side S9. And K-A20 from top to bottom respectively represent the types of aspheric coefficients, among which K represents the cone coefficient, A3 represents the third aspheric coefficient, A4 represents the fourth aspheric coefficient, A5 represents the fifth aspheric coefficient, A6 represents the sixth aspheric coefficient, and so on. In addition, the formula for the aspheric coefficient is as follows:

[0083]

[0084] Among them, Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspherical surface to the optical axis O, c is the curvature of the aspherical vertex, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula.

[0085] See also Figure 2 In (A), Figure 2 (A) shows the spherical aberration curve of the optical lens 100 in the first embodiment at wavelengths of 975nm, 950nm, and 925nm. The horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the normalized field of view. Figure 2 As can be seen from (A) in the figure, the values ​​of the focus point deviation in the first embodiment are all less than 0.1 mm, and the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0086] See also Figure 2 In (B), Figure 2 (B) in FIG. 1 is a light astigmatism diagram of the optical lens 100 in the first embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the field angle, in degrees. The astigmatism curve represents the meridian imaging surface curvature T and the sagittal imaging surface curvature S, which are represented by Figure 2 As can be seen from (B) in FIG. 1 , the maximum values ​​of the arc field curvature and the meridian field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0087] See also Figure 2 (C) in Figure 2 (C) is a distortion curve of the optical lens 100 in the first embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view, in degrees. Figure 2 As can be seen from (C) in FIG. 1 , at a wavelength of 950 nm, the maximum distortion is less than 15%, and the distortion of the optical lens 100 is well corrected.

[0088] Second embodiment

[0089] Please refer to Figure 3 , Figure 3 1 is a schematic diagram of the structure of an optical lens 100 according to a second embodiment of the present invention. The optical lens 100 comprises a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a filter G1 and a protective glass G2, which are sequentially arranged along an optical axis O from the object side to the image side.

[0090] Furthermore, in the second embodiment, the refractive power and the surface shape of each lens are consistent with the refractive power and the surface shape of each lens in the first embodiment.

[0091] The other parameters in the second embodiment are given in the following Table 2a, and the definitions of the parameters can be obtained from the description of the first embodiment, and are not repeated here. It can be understood that the units of the Y radius, thickness, focal length and Y aperture in Table 2a are all mm. The reference wavelength of the refractive index and Abbe number of each lens in Table 2a is 588nm, and the reference wavelength of the focal length is 950nm.

[0092] Table 2a

[0093]

[0094] Table 2b

[0095] Surface number 1 2 6 7 8 9 K 0.0000E+00 0.0000E+00 0.0000E+00 -3.3346E-01 2.0000E+01 3.4023E-02 A3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.0903E-01 5.5956E-02 A4 4.9101E-02 3.9895E-02 1.1893E-01 -4.5958E-02 -1.0040E-01 -6.0462E-01 A5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -4.0780E-01 5.1395E-01 A6 -8.3786E-03 -5.4515E-03 -1.9459E+00 1.5498E-01 1.3728E+00 -1.4734E-01 A7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -2.0168E+00 1.0294E-02 A8 1.2540E-03 -1.2170E-04 1.0696E+01 -1.1432E-01 1.5294E+00 -2.7759E-02 A10 -9.4448E-05 2.2578E-04 -3.2580E+01 2.3599E-02 -7.0905E-01 1.5706E-02 A12 1.2045E-06 -4.0444E-05 5.5050E+01 2.5011E-02 3.6995E-01 -4.1805E-03 A14 1.9416E-08 -3.0461E-06 -4.8368E+01 -1.6527E-02 -1.2669E-01 6.1733E-04 A16 3.3075E-08 1.0487E-06 1.7205E+01 2.9827E-03 2.3679E-02 -6.2157E-05 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.7971E-03 4.0202E-06

[0096] See also Figure 4 In (A), Figure 4 (A) shows the spherical aberration curves of the optical lens 100 in the second embodiment at wavelengths of 975 nm, 950 nm, and 925 nm. Figure 4 In (A), the horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the normalized field of view. Figure 4 As can be seen from (A) in the figure, the focus point deviation values ​​in the second embodiment are all less than 0.1 mm, and the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0097] See also Figure 4 In (B), Figure 4 (B) is the astigmatism diagram of the optical lens 100 in the second embodiment at a wavelength of 950nm. The horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the field angle, in degrees. The astigmatism curve represents the meridian imaging surface curvature T and the sagittal imaging surface curvature S, which is represented by Figure 4 As can be seen from (B) in FIG. 1 , the maximum values ​​of the arc field curvature and the meridian field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0098] See also Figure 4 (C) in Figure 4 (C) is a distortion curve of the optical lens 100 in the second embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view, in degrees. Figure 4 As can be seen from (C) in FIG. 1 , at a wavelength of 950 nm, the maximum distortion is less than 15%, and the distortion of the optical lens 100 is well corrected.

[0099] Third embodiment

[0100] Please refer to Figure 5 , Figure 5 1 is a schematic diagram of the structure of an optical lens 100 according to the third embodiment of the present application. The optical lens 100 comprises a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a filter G1 and a protective glass G2, which are sequentially arranged along an optical axis O from the object side to the image side.

[0101] Furthermore, in the third embodiment, the refractive power and the surface shape of each lens are consistent with the refractive power and the surface shape of each lens in the first embodiment.

[0102] The other parameters in the third embodiment are given in the following Table 3a, and the definitions of the parameters can be obtained from the description of the above embodiments, and are not repeated here. It can be understood that the units of the Y radius, thickness, focal length and Y aperture in Table 3a are all mm. The reference wavelength of the refractive index and Abbe number of each lens in Table 3a is 588nm, and the reference wavelength of the focal length is 950nm.

[0103] Table 3a

[0104]

[0105] Table 3b

[0106]

[0107]

[0108] See also Figure 6 In (A), Figure 6 (A) shows the spherical aberration curves of the optical lens 100 in the third embodiment at wavelengths of 975 nm, 950 nm, and 925 nm. Figure 6 In (A), the horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the normalized field of view. Figure 6 As can be seen from (A) in the figure, the values ​​of the focus point deviation in the third embodiment are all less than 0.1 mm, and the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0109] See also Figure 6 In (B), Figure 6 (B) in FIG. 1 is a light astigmatism diagram of the optical lens 100 in the third embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the field angle, in degrees. The astigmatism curve represents the meridian imaging surface curvature T and the sagittal imaging surface curvature S, which is represented by Figure 6As can be seen from (B) in FIG. 1 , the maximum values ​​of the arc field curvature and the meridian field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0110] See also Figure 6 (C) in Figure 6 (C) is a distortion curve of the optical lens 100 in the third embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view, in degrees. Figure 6 As can be seen from (C) in FIG. 1 , at a wavelength of 950 nm, the maximum distortion is less than 15%, and the distortion of the optical lens 100 is well corrected.

[0111] Fourth embodiment

[0112] See also Figure 7 , Figure 7 Schematic diagram of the structure of the optical lens 100 of the fourth embodiment of the present application. The optical lens 100 comprises a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a filter G1 and a protective glass G2, which are arranged in sequence from the object side to the image side along the optical axis O.

[0113] Furthermore, in the fourth embodiment, the refractive power and the surface shape of each lens are consistent with the refractive power and the surface shape of each lens in the first embodiment.

[0114] The other parameters in the fourth embodiment are given in the following Table 4a, and the definitions of the parameters can be obtained from the description of the above embodiments, and are not repeated here. It can be understood that the units of the Y radius, thickness, focal length and Y aperture in Table 4a are all mm. The reference wavelength of the refractive index and Abbe number of each lens in Table 4a is 588nm, and the reference wavelength of the focal length is 950nm.

[0115] Table 4a

[0116]

[0117] Table 4b

[0118]

[0119]

[0120] See also Figure 8 In (A), Figure 8 (A) shows the spherical aberration curves of the optical lens 100 in the fourth embodiment at wavelengths of 975nm, 950nm, and 925nm. Figure 8In (A), the horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the normalized field of view. Figure 8 As can be seen from (A) in the figure, the values ​​of the focus point deviation in the fourth embodiment are all less than 0.1 mm, and the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0121] See also Figure 8 In (B), Figure 8 (B) in FIG. 1 is a light astigmatism diagram of the optical lens 100 in the fourth embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the field angle, in degrees. The astigmatism curve represents the meridian imaging surface curvature T and the sagittal imaging surface curvature S, which is represented by Figure 8 As can be seen from (B) in FIG. 1 , the maximum values ​​of the arc field curvature and the meridian field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0122] See also Figure 8 (C) in Figure 6 (C) is a distortion curve of the optical lens 100 in the fourth embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view, in degrees. Figure 8 As can be seen from (C) in FIG. 1 , at a wavelength of 950 nm, the maximum distortion is less than 15%, and the distortion of the optical lens 100 is well corrected.

[0123] Fifth embodiment

[0124] See also Fig. 9 , Fig. 9 1 is a schematic diagram of the structure of an optical lens 100 according to the fifth embodiment of the present application. The optical lens 100 comprises a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a filter G1 and a protective glass G2, which are sequentially arranged along an optical axis O from the object side to the image side.

[0125] Furthermore, in the fifth embodiment, the refractive power and the surface shape of each lens are consistent with the refractive power and the surface shape of each lens in the first embodiment.

[0126] The other parameters in the fifth embodiment are given in the following Table 5a, and the definitions of the parameters can be obtained from the description of the above embodiments, and are not repeated here. It can be understood that the units of the Y radius, thickness, focal length and Y aperture in Table 5a are all mm. The reference wavelength of the refractive index and Abbe number of each lens in Table 5a is 588nm, and the reference wavelength of the focal length is 950nm.

[0127] Table 5a

[0128]

[0129] Table 5b

[0130]

[0131]

[0132] See also Fig.10 In (A), Fig.10 (A) shows the spherical aberration curves of the optical lens 100 in the fifth embodiment at wavelengths of 975nm, 950nm, and 925nm. Fig.10 In (A), the horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the normalized field of view. Fig.10 As can be seen from (A) in FIG. 1 , the values ​​of the focus point deviation in the fifth embodiment are all less than 0.1 mm, and the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0133] See also Fig.10 In (B), Fig.10 (B) is the astigmatism diagram of the optical lens 100 in the fifth embodiment at a wavelength of 950nm. The horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the field angle, in degrees. The astigmatism curve represents the meridian imaging surface curvature T and the sagittal imaging surface curvature S, which is represented by Fig.10 As can be seen from (B) in FIG. 1 , the maximum values ​​of the arc field curvature and the meridian field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0134] See also Fig.10 (C) in Fig.10 (C) is a distortion curve of the optical lens 100 in the fifth embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view, in degrees. Fig.10 As can be seen from (C) in FIG. 1 , at a wavelength of 950 nm, the maximum distortion is less than 15%, and the distortion of the optical lens 100 is well corrected.

[0135] Sixth embodiment

[0136] See also Fig.11 , Fig.11Schematic diagram of the structure of the optical lens 100 of the sixth embodiment of the present application. The optical lens 100 comprises a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a filter G1 and a protective glass G2, which are sequentially arranged along the optical axis O from the object side to the image side.

[0137] Furthermore, in the sixth embodiment, the refractive power and the surface shape of each lens are consistent with the refractive power and the surface shape of each lens in the first embodiment.

[0138] The other parameters in the sixth embodiment are given in the following Table 6a, and the definitions of the parameters can be obtained from the description of the above embodiments, and are not repeated here. It can be understood that the units of the Y radius, thickness, focal length and Y aperture in Table 6a are all mm. The reference wavelength of the refractive index and Abbe number of each lens in Table 6a is 588nm, and the reference wavelength of the focal length is 950nm.

[0139] Table 6a

[0140]

[0141]

[0142] Table 6b

[0143] Surface number 1 2 6 7 8 9 K 0.0000E+00 0.0000E+00 4.5696E+00 -6.5821E-01 2.8047E-01 -6.0544E-01 A3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -3.9967E-02 -3.3443E-03 A4 5.0837E-02 3.8763E-02 -5.9505E-02 1.5567E-01 2.6761E-02 -2.9708E-01 A5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -2.6736E-02 1.9854E-01 A6 -8.5501E-03 -5.9309E-03 -6.5740E-02 -8.5593E-02 3.2556E-02 1.7738E-03 A7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 1.4133E-03 -1.0623E-02 A8 1.1622E-03 -3.1073E-04 1.1587E-01 7.8878E-02 -1.4547E-02 -2.7509E-02 A10 -7.4854E-05 1.6877E-04 -2.8800E-01 -6.7924E-02 5.5356E-03 1.3936E-02 A12 1.2345E-06 -9.2573E-06 6.5758E-01 4.3459E-02 -1.5251E-03 -3.4965E-03 A14 -2.6357E-08 -1.9819E-06 -9.5752E-01 -1.5188E-02 2.3220E-04 4.5582E-04 A16 3.5435E-08 1.9371E-07 5.6719E-01 2.1870E-03 -1.3599E-05 -2.3855E-05 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.0723E-07 -3.1840E-08

[0144] See also Fig.12 In (A), Fig.12 (A) shows the spherical aberration curves of the optical lens 100 in the sixth embodiment at wavelengths of 975nm, 950nm, and 925nm. Fig.12 In (A), the horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the normalized field of view. Fig.12 As can be seen from (A) in the figure, the values ​​of the focus point deviation in the sixth embodiment are all less than 0.1 mm, and the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0145] See also Fig.12 In (B), Fig.12 (B) is the astigmatism diagram of the optical lens 100 in the sixth embodiment at a wavelength of 950nm. The horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the field angle, in degrees. The astigmatism curve represents the meridian imaging surface curvature T and the sagittal imaging surface curvature S, which is represented by Fig.12 As can be seen from (B) in FIG. 1 , the maximum values ​​of the arc field curvature and the meridian field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0146] See also Fig.12 (C) in Figure 6 (C) is a distortion curve of the optical lens 100 in the sixth embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view, in degrees. Fig.12 As can be seen from (C) in FIG. 1 , at a wavelength of 950 nm, the maximum distortion is less than 15%, and the distortion of the optical lens 100 is well corrected.

[0147] Seventh embodiment

[0148] See also Fig.13 , Fig.13 1 is a schematic diagram of the structure of an optical lens 100 according to the seventh embodiment of the present application. The optical lens 100 comprises a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a filter G1 and a protective glass G2, which are sequentially arranged along an optical axis O from the object side to the image side.

[0149] Furthermore, in the seventh embodiment, the refractive power and the surface shape of each lens are consistent with the refractive power and the surface shape of each lens in the first embodiment.

[0150] The other parameters in the seventh embodiment are given in the following Table 7a, and the definitions of the parameters can be obtained from the description of the previous embodiment, and are not repeated here. It can be understood that the units of the Y radius, thickness, focal length and Y aperture in Table 7a are all mm. The reference wavelength of the refractive index and Abbe number of each lens in Table 7a is 588nm, and the reference wavelength of the focal length is 950nm.

[0151] Table 7a

[0152]

[0153]

[0154] Table 7b

[0155] Surface number 1 2 6 7 8 9 K 0.0000E+00 0.0000E+00 1.1936E+01 -6.4756E-01 -5.6100E+00 -6.6048E-01 A3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -5.5037E-02 -1.7232E-02 A4 4.9101E-02 3.9895E-02 -4.9462E-02 1.5365E-01 8.3864E-03 -3.4954E-01 A5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -2.2040E-02 2.3554E-01 A6 -8.3786E-03 -5.4515E-03 -3.8816E-02 -9.4033E-02 3.2602E-02 8.0941E-04 A7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 1.5541E-03 -1.4883E-02 A8 1.2540E-03 -1.2170E-04 9.6556E-02 9.2442E-02 -1.5732E-02 -3.2045E-02 A10 -9.4448E-05 2.2578E-04 -2.5692E-01 -7.6143E-02 6.6788E-03 1.6947E-02 A12 1.2045E-06 -4.0444E-05 2.9749E-01 4.3587E-02 -2.0173E-03 -4.3579E-03 A14 1.9416E-08 -3.0461E-06 -1.2277E-01 -1.3740E-02 2.9777E-04 5.8886E-04 A16 3.3075E-08 1.0487E-06 1.9389E-03 1.8113E-03 -1.1097E-05 -3.3696E-05 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -5.6453E-07 1.9337E-07

[0156] See also Fig.14 In (A), Fig.14 (A) shows the spherical aberration curves of the optical lens 100 in the seventh embodiment at wavelengths of 975nm, 950nm, and 925nm. Fig.14 In (A), the horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the normalized field of view. Fig.14As can be seen from (A) in the figure, the values ​​of the focus point deviation in the seventh embodiment are all less than 0.1 mm, and the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0157] See also Fig.14 In (B), Fig.14 (B) is the astigmatism diagram of the optical lens 100 in the seventh embodiment at a wavelength of 950nm. The horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the field angle, in degrees. The astigmatism curve represents the meridian imaging surface curvature T and the sagittal imaging surface curvature S, which is represented by Fig.14 As can be seen from (B) in FIG. 1 , the maximum values ​​of the arc field curvature and the meridian field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0158] See also Fig.14 (C) in Fig.14 (C) is a distortion curve of the optical lens 100 in the seventh embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view, in degrees. Fig.14 As can be seen from (C) in FIG. 1 , at a wavelength of 950 nm, the maximum distortion is less than 15%, and the distortion of the optical lens 100 is well corrected.

[0159] Eighth embodiment

[0160] See also Fig.15 , Fig.15 1 is a schematic diagram of the structure of an optical lens 100 according to the eighth embodiment of the present application. The optical lens 100 comprises a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a filter G1 and a protective glass G2, which are sequentially arranged along an optical axis O from the object side to the image side.

[0161] Furthermore, in the eighth embodiment, the refractive power and the surface shape of each lens are consistent with the refractive power and the surface shape of each lens in the first embodiment.

[0162] The other parameters in the eighth embodiment are given in the following Table 8a, and the definitions of the parameters can be obtained from the description of the above-mentioned embodiment, and are not repeated here. It can be understood that the units of the Y radius, thickness, focal length and Y aperture in Table 8a are all mm. The reference wavelength of the refractive index and Abbe number of each lens in Table 8a is 588nm, and the reference wavelength of the focal length is 950nm.

[0163] Table 8a

[0164]

[0165]

[0166] Table 8b

[0167] Surface number 1 2 6 7 8 9 K 0.0000E+00 0.0000E+00 1.3374E+01 -6.4612E-01 4.9822E+00 -6.5067E-01 A3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -5.4962E-02 -1.6825E-02 A4 4.8682E-02 3.9653E-02 -5.0560E-02 1.5409E-01 8.7571E-03 -3.5015E-01 A5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -2.2283E-02 2.3588E-01 A6 -8.3686E-03 -5.6445E-03 -3.2023E-02 -9.4210E-02 3.2354E-02 7.3474E-04 A7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 1.5104E-03 -1.4976E-02 A8 1.2580E-03 -9.1678E-05 9.3835E-02 9.2452E-02 -1.5722E-02 -3.2073E-02 A10 -9.4377E-05 2.3802E-04 -2.7373E-01 -7.6219E-02 6.6824E-03 1.6950E-02 A12 1.1677E-06 -4.1857E-05 2.9391E-01 4.3575E-02 -2.0194E-03 -4.3564E-03 A14 6.9457E-09 -3.8533E-06 -7.7183E-02 -1.3711E-02 2.9876E-04 5.8905E-04 A16 3.4254E-08 1.1807E-06 -2.7083E-02 1.8055E-03 -1.0439E-05 -3.3770E-05 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -7.2127E-07 1.9529E-07

[0168] See also Fig.16 In (A), Fig.16 (A) shows the spherical aberration curves of the optical lens 100 in the eighth embodiment at wavelengths of 975nm, 950nm, and 925nm. Fig.16 In (A), the horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the normalized field of view. Fig.16 As can be seen from (A) in the figure, the values ​​of the focus point deviation in the eighth embodiment are all less than 0.1 mm, and the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0169] See also Fig.16 In (B), Fig.16 (B) is the astigmatism diagram of the optical lens 100 in the eighth embodiment at a wavelength of 950nm. The horizontal axis along the X-axis direction represents the focus offset, and the vertical axis along the Y-axis direction represents the field angle, in degrees. The astigmatism curve represents the meridian imaging surface curvature T and the sagittal imaging surface curvature S, which is represented by Fig.16 As can be seen from (B) in FIG. 1 , the maximum values ​​of the arc field curvature and the meridian field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0170] See also Fig.16 (C) in Fig.16 (C) is a distortion curve of the optical lens 100 in the eighth embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view angle, in degrees. Fig.16 As can be seen from (C) in FIG. 1 , at a wavelength of 950 nm, the maximum distortion is less than 15%, and the distortion of the optical lens 100 is well corrected.

[0171] Table 9 shows the FOV, ImgH / F, TTL / ImgH, FOV / FNO, TTL / F, SD11 / SD21, SD22 / SD31, SD41 / SD32, (F1+F2) / F, F1 / F, F1 / F4, ∑CT / ∑AT, CT3 / CT4, TTL / CT3, F2 / CT2, R11 / R42, (R21+R22) / (R2 1-R22), R41 / R42, CT1 / CT4, CT3 / CT2, CT23 / CT12, FOV*F / ImgH, ImgH / (F*tan(FOV / 2)), FNO, F / F2, F / F3, F / F4, F2 / F3, R21 / R32, R22 / R31, R11 / F, SD1 / ImgH, TTL / ∑CT, R12 / R11, R22 / R21 and R31 / R32.

[0172] Table 9

[0173]

[0174]

[0175] See also Fig.17 The embodiment of the present application also discloses a camera module 200, which includes a photosensitive chip 201 and the above-mentioned optical lens 100, and the photosensitive chip 201 is arranged on the image side of the optical lens 100. The optical lens 100 is used to receive the light signal of the object and project it to the photosensitive chip 201, and the photosensitive chip 201 is used to convert the light signal corresponding to the object into an image signal, which will not be described in detail here. The camera module with the optical lens 100 can realize the light and small design of the optical lens 100, and at the same time make the optical lens 100 have the characteristics of a large image surface, thereby improving the imaging quality of the optical lens 100.

[0176] See also Fig.18 The embodiment of the present application further discloses a terminal device 300, which includes a housing 301 and the camera module 200, and the camera module 200 is arranged in the housing 301. The terminal device 300 may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, a smart watch, a monitor, etc. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100, that is, it can realize the thin and light, miniaturized design of the optical lens 100, and at the same time make the optical lens 100 have the characteristics of a large image plane, thereby improving the imaging quality of the optical lens 100.

[0177] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. An optical lens, characterized in that: There are a total of four lenses with refractive power in the optical lens. The four lenses include, in order from the object side to the image side along the optical axis: The first lens, which has a negative refractive power. The object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis. The second lens, which has a positive refractive power. The object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is concave near the optical axis. The third lens, which has a positive refractive power. The object side surface of the third lens is concave near the optical axis, and the image side surface of the third lens is convex near the optical axis. The fourth lens, which has a negative refractive power. The object side surface of the fourth lens is convex near the optical axis, and the image side surface of the fourth lens is concave near the optical axis. The optical lens satisfies the following relationships: 65° < FOV < 75°, 1.2 < ImgH / F < 1.4; Wherein, FOV is the maximum field of view angle of the optical lens, ImgH is the diameter of the largest effective imaging circle on the imaging surface of the optical lens, and F is the effective focal length of the optical lens.

2. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationships: 1.7 < TTL / ImgH < 1.9, and / or, 30° < FOV / FNO < 34°, and / or, 2.1 < TTL / F < 2.5; Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, and FNO is the f-number of the optical lens.

3. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationships: 1.4 < SD11 / SD21 < 1.7, and / or, 0.9 < SD22 / SD31 < 1.1, and / or, 1 < SD41 / SD32 < 1.5; Wherein, SD11 is the maximum effective aperture of the object side surface of the first lens, SD21 is the maximum effective aperture of the object side surface of the second lens, SD22 is the maximum effective aperture of the image side surface of the second lens, SD31 is the maximum effective aperture of the object side surface of the third lens, SD41 is the maximum effective aperture of the object side surface of the fourth lens, and SD32 is the maximum effective aperture of the image side surface of the third lens.

4. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationships: -4 < (F1 + F2) / F < -1, and / or, -5 < F1 / F < -2, and / or, 2 < F1 / F4 < 6.1; Wherein, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, and F4 is the effective focal length of the fourth lens.

5. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationships: 3 < ∑CT / ∑AT < 6, and / or, 2 < CT3 / CT4 < 3.4, and / or, 4 < TTL / CT3 < 4.4; Wherein, ∑CT is the sum of the thicknesses of all the lenses from the first lens to the fourth lens on the optical axis, ∑AT is the sum of the air gaps between adjacent two lenses from the first lens to the fourth lens, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis.

6. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationships: 2 < F2 / CT2 < 3.7, and / or, -2 < R11 / R42 < -1, and / or, -7 < (R21 + R22) / (R21 - R22) < -2, and / or, 4 < R41 / R42 < 20; wherein, F2 is the effective focal length of the second lens, CT2 is the thickness of the second lens on the optical axis, R11 is the curvature radius of the object side surface of the first lens on the optical axis, R42 is the curvature radius of the image side surface of the fourth lens on the optical axis, R21 is the curvature radius of the object side surface of the second lens on the optical axis, R22 is the curvature radius of the image side surface of the second lens on the optical axis, and R41 is the curvature radius of the object side surface of the fourth lens on the optical axis.

7. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional expressions: 0.8 < CT1 / CT4 < 1.6, and / or, 1.2 < CT3 / CT2 < 1.6, and / or, 0.3 < CT23 / CT12 < 1.3; wherein, CT1 is the thickness of the first lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT23 is the distance between the image side surface of the second lens and the object side surface of the third lens on the optical axis, and CT12 is the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis.

8. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional expressions: 52° < FOV * F / ImgH < 55°, and / or, 1.7 < ImgH / (F * tan(FOV / 2)) < 2.

9. A camera module, characterized in that: The imaging module includes an image sensor chip and the optical lens according to any one of claims 1 - 8, and the image sensor chip is disposed on the image side of the optical lens.

10. A terminal device, characterized in that: It includes a housing and the imaging module according to claim 9, and the imaging module is disposed in the housing.

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