Optical lens, camera module and terminal device

Abstract

The application discloses an optical lens, a camera module and a terminal device. The optical lens has four lenses with refractive power. The four lenses are sequentially arranged along an optical axis from an object side to an image side and include: a first lens with negative refractive power, wherein an object side surface of the first lens is concave at a near optical axis, and an image side surface of the first lens is convex at the near optical axis; a second lens with positive refractive power, wherein an object side surface of the second lens is convex at the near optical axis, and an image side surface of the second lens is concave at the near optical axis; a third lens with positive refractive power, wherein an object side surface of the third lens is concave at the near optical axis, and an image side surface of the third lens is convex at the near optical axis; and a fourth lens with negative refractive power, wherein an object side surface of the fourth lens is convex at the near optical axis, and an image side surface of the fourth lens is concave at the near optical axis. The optical lens satisfies the following relationship: 65°<FOV<75°, 1.2<ImgH / F<1.4. The optical lens provided by the application can realize the thinning and shortening of the optical lens 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 is constantly rising, 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 propose an optical lens, a camera module and a terminal device that can have a relatively large field of view angle and high imaging quality at the same time.

[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 include, in order from the object side to the image side along the optical axis: 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 incident light passes through the first lens, which has negative refractive power, it can effectively couple light from a wider field of view into the optical lens. The object-side and image-side surfaces of the first lens are concave and convex near the optical axis, respectively, which helps to increase the field of view of the optical lens and shorten its overall optical length. The second lens has positive refractive power, and its object-side surface is convex near the optical axis while its image-side surface is concave near the optical axis. This helps to reduce the angle of incidence of light on the object-side and image-side surfaces of the second lens, reducing reflections on the lens surface and correcting aberrations. The third lens has positive refractive power, and its object-side surface is concave near the optical axis while its image-side surface is convex near the optical axis. This helps to rationally distribute the refractive power of the optical lens, reducing the overall refractive power shift towards the object side, thus contributing to a shorter overall optical length and achieving miniaturization. The fourth lens, with its negative refractive power, effectively corrects field curvature and astigmatism in the optical lens and can be matched with a sensor with a large principal angle, thereby improving image quality. By making the object-side surface of the fourth lens convex near the optical axis and the image-side surface concave near the optical axis, the overall optical length of the optical lens can be further shortened, making the four-lens structure more compact. When the field of view (FOV) is between 65° and 75°, the optical lens has a large field of view, which allows it to capture more scene content and well meets the needs of in-vehicle scene monitoring. When the ImgH / F ratio is between 1.2 and 1.4, it effectively corrects the distortion produced by the optical lens, thereby reducing the manufacturing difficulty of the optical lens while improving its image quality. In addition, it helps to control the focal length of the optical lens within a reasonable range and ensures that the optical lens has sufficient light-gathering area and a wide field of view, thus simultaneously satisfying the characteristics of a large field of view and a large image plane.

[0007] Secondly, this application discloses a camera module, which includes a photosensitive chip and an optical lens as described in the first aspect above, wherein the photosensitive chip is disposed on the image side of the optical lens. The camera module with the optical lens enables miniaturized optical lens design while simultaneously giving the optical lens a large field of view and a large image plane, thereby improving the imaging quality of the optical lens.

[0008] Thirdly, this application discloses a terminal device, including a housing and a camera module as described in the second aspect above, wherein the camera module is disposed in the housing. Electronic devices having the camera module achieve miniaturized optical lens design while simultaneously enabling the optical lens to possess a large image sensor, thereby improving the imaging quality of the optical lens. Attached Figure Description

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

[0010] Figure 2 These are the longitudinal spherical aberration curve (mm), astigmatism curve (mm), and distortion curve (%) of the optical lens disclosed in the first embodiment of this application.

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

[0012] Figure 4 These are the longitudinal spherical aberration curve (mm), astigmatism curve (mm), and distortion curve (%) of the optical lens disclosed in the second embodiment of this application.

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

[0014] Figure 6 These are the longitudinal spherical aberration curves (mm), astigmatism curves (mm), and distortion curves (%) of the optical lens disclosed in the third embodiment of this application.

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

[0016] Figure 8 These are the longitudinal spherical aberration curves (mm), astigmatism curves (mm), and distortion curves (%) of the optical lens disclosed in the fourth embodiment of this application.

[0017] Figure 9 This is a schematic diagram of the structure of the optical lens disclosed in the fifth embodiment of this application.

[0018] Figure 10 These are the longitudinal spherical aberration curves (mm), astigmatism curves (mm), and distortion curves (%) of the optical lens disclosed in the fifth embodiment of this application.

[0019] Figure 11 This is a schematic diagram of the structure of the optical lens disclosed in the sixth embodiment of this application.

[0020] Figure 12 These are the longitudinal spherical aberration curves (mm), astigmatism curves (mm), and distortion curves (%) of the optical lens disclosed in the sixth embodiment of this application.

[0021] Figure 13 This is a schematic diagram of the structure of the optical lens disclosed in the seventh embodiment of this application.

[0022] Figure 14These are the longitudinal spherical aberration curves (mm), astigmatism curves (mm), and distortion curves (%) of the optical lens disclosed in the seventh embodiment of this application.

[0023] Figure 15 This is a schematic diagram of the structure of the optical lens disclosed in the eighth embodiment of this application.

[0024] Figure 16 These are the longitudinal spherical aberration curves (mm), astigmatism curves (mm), and distortion curves (%) of the optical lens disclosed in the eighth embodiment of this application.

[0025] Figure 17 This is a schematic diagram of the camera module disclosed in this application.

[0026] Figure 18 This is a schematic diagram of the terminal device disclosed in this application. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0028] Please see Figure 1 The first aspect of this application discloses an optical lens 100, which comprises four lenses with refractive power. These four lenses, arranged sequentially from the object side to the image side along the optical axis, include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. During imaging, light rays enter sequentially from the object side of the first lens L1, through the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4, and are ultimately imaged onto the imaging plane 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 near the optical axis O, and the image-side surface S2 of the first lens L1 is convex near the optical axis O. The object-side surface S3 of the second lens L2 is convex near the optical axis O, and the image-side surface S4 of the second lens L2 is concave near the optical axis O. The object-side surface S5 of the third lens L3 is concave near the optical axis O, and the image-side surface S6 of the third lens L3 is convex near the optical axis O. The object-side surface S7 of the fourth lens L4 is convex near the optical axis O, and the image-side surface S8 of the fourth lens L4 is concave near the 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 within a relatively large field of view range into the optical lens. With the surface shape design where the object side surface S1 and the image side surface S2 of the first lens L1 are concave and convex respectively near the optical axis O, it is beneficial to increase the field of view angle of the optical lens 100 and shorten the overall optical length of the optical lens 100. The second lens L2 has positive refractive power, and the object side surface S3 of the second lens L2 is set as a convex surface near the optical axis, and the image side surface S4 is set as a concave surface near the optical axis O, which helps to reduce the incident angles of light on the object side surface S3 and the image side surface 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 surface S5 of the third lens L3 is set as a concave surface near the optical axis O, and the image side surface S6 is set as a convex surface near the optical axis O, which is beneficial to reasonably distribute the refractive power of the optical lens 100, reduce the amplitude of the overall refractive power of the optical lens 100 moving towards the object side direction, help to shorten the overall optical length of the optical lens 100, and meet the design requirements of miniaturization. When combined with the fourth lens L4 with negative refractive power, it can better correct the field curvature and astigmatism of the optical lens 100 and can match with a photosensitive chip with a relatively large principal light angle, thereby improving the imaging quality. By setting the object side surface S7 of the fourth lens L4 as a convex surface near the optical axis O and the image side surface S8 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°. Here, 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 relatively large field of view angle, which is beneficial for the optical lens 100 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 sufficient light-receiving area and sufficient field angle, so as to simultaneously meet the characteristics of a large field angle and a large image surface.

[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 different materials of lenses 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 an aperture stop STO. The aperture stop STO can be an aperture stop or a field stop, and it can be disposed 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 aperture stop STO can also be disposed between the object side of the optical lens 100 and the object side S1 of the first lens L1, or the aperture stop STO can also be disposed 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 bandpass filter can be selected. The infrared bandpass 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 bandpass filter allows infrared light within a desired wavelength range to pass through, while light of other wavelengths outside the range will be filtered out and unable to pass through, thereby avoiding interference light from affecting the normal imaging of infrared light and improving the imaging quality in low light conditions.

[0038] In some embodiments, the optical lens 100 satisfies the following relationship: 1.7 < TTL / ImgH < 1.9. Here, 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 achieve good thinness and lightness, have good aberration balance and image quality improvement ability, and at the same time support high-pixel photosensitive chips. 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. If it is 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. If it is 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 resolution.

[0039] In some embodiments, the optical lens 100 satisfies the following relationship: 30° < FOV / FNO < 34°. Here, 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 angle and 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. If it is higher than the upper limit of the above relationship, the field angle of the optical lens 100 is too large, resulting in excessive 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 much light passing through 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), and further leading to a decline in the imaging performance of the optical lens 10; if it is lower than the lower limit of the above relationship, it will cause insufficient light passing amount of the optical lens 100, resulting in a decrease in the clarity of the captured image.

[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 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. Where 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 emitted 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, increases the 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 main 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 excessive vignetting is introduced, which is not conducive to maintaining a 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 sag height at the maximum effective aperture between 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 too large surface curvature 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 curvature of the fourth lens L4 is too large and the processing difficulty of the fourth lens L4 is increased can be effectively avoided, and at the same time, the problem that a large-angle beam cannot enter the optical lens 100 and the imaging quality of the optical lens 100 is poor can also be effectively avoided, and the risk of ghosting of 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 curvature of the fourth lens L4 is too large, which will increase the processing difficulty of the fourth lens L4, and at the same time, it will also cause a large-angle beam not to enter the optical lens 100 and the imaging quality is poor; 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 of the optical lens 100.

[0044] In some embodiments, the optical lens 100 satisfies the following relational expression: -4 < (F1 + F2) / F < -1. Here, 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 coordinated in the optical lens 100, which is conducive to large-angle light rays entering the optical lens 100 and thus obtaining 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 rays incident on the optical lens 100 from the first lens L1, delay the incident angle of the light rays, reduce aberration, and simplify the aberration correction of the entire optical lens 100 and the balance of imaging quality.

[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. Here, 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 10, 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 from 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 from 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 beneficial to shortening the total length of the optical lens 100, thereby achieving 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 from 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 beneficial to ensure that the uniformity of the thickness of the third lens L3 and 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 achieving 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 relationship: 4 < TTL / CT3 < 4.4. Here, 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 relationship, 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 eccentricity sensitivity of the third lens L3, thereby facilitating the production and assembly of the optical lens 100. When higher than the upper limit of the conditional formula, the total length of the optical lens 100 is too long, which is not conducive to achieving miniaturized design and reducing production costs; when lower than the lower limit of the conditional formula, the central thickness of the third lens L3 is too large, resulting in an increase in the eccentricity 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 relationship: 2 < F2 / CT2 < 3.7. Here, 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 relationship, the focal length of the second lens L2 and the thickness of the second lens L2 on the optical axis O are reasonably configured, which can effectively correct the aberration of the optical lens 100 and improve the imaging quality. When lower than the lower limit of the conditional formula, 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 aberration is likely to occur; when higher than the upper limit of the conditional formula, 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, thus affecting the imaging quality of the optical lens 100.

[0051] In some embodiments, the optical lens​​In some embodiments, the optical lens 100 satisfies the following relationship: -7 < (R21 + R22) / (R21 - R22) < -2. Here, 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 relationship, it can effectively control the bending degree and the thickness ratio trend 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 shape 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 formula, the surface shape 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 formula, the bending degree of the surface shape 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, thus affecting the imaging quality of the optical lens 100.

[0053] In some embodiments, the optical lens 100 satisfies the following relationship: 4 < R41 / R42 < 20. Here, 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 relationship, it is beneficial to correct the aberration generated by the optical lens 100, make the refractive power distribution 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, making it 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 as to reasonably distribute the refractive power of the lenses in the optical lens 100, 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 technology 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. At the same time, off-axis aberrations 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°, 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, make the optical lens 100 have a suitable image plane size, and improve the brightness of the imaging plane IMG of the optical lens 100. When it is higher than the upper limit of the conditional formula, the image height of the optical lens 100 is smaller, resulting in an overly small imaging size of the image, making it difficult for the imaging plane IMG of the optical lens 100 to be matched with the image sensor, greatly reducing the relative illuminance of the imaging plane IMG, making the brightness of the imaging plane IMG darker, and easily causing the phenomenon of vignetting in the captured image, reducing the imaging quality; when it is lower than the lower limit of the conditional formula, 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, 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, helping 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 capture 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 and 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 in the outer field of view, resulting in a distorted 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 applied 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 beneficial to expand the field 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, 1.8, 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. Here, 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 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 excessive 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 telephoto characteristics. When it exceeds the upper limit of the above relational expression, the focal length of the fourth lens L4 is too large, making it difficult to balance the distortion generated by the first lens L1, the second lens L2, and the third lens L3. The refractive index of the optical lens 100 is too large, which easily causes 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, making it difficult to tune the angle of the light 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 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 radius of curvature of the object side surface S3 of the second lens L2 at the optical axis O, and R32 is the radius of curvature 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 radius of curvature of the second lens L2 and the third lens L3 can be effectively controlled, the surface shape with 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 excessive difference in the refractive power of each lens 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 radius of curvature 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 radius of curvature 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 radius of curvature 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 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 cause 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, thereby achieving 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 surface 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, thereby effectively reducing the aberration introduction value of the incident light, promoting 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 shaping of the first lens L1, and improves 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 surface S5 and the image side surface S6 of the third lens L3 can be optimized, which is beneficial to the reasonable cooperation of the third lens L3 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, and at the same time, it is beneficial to correct the light 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, an aperture STO, a third lens L3, a fourth lens L4, a filter G1, and a protective glass G2, which are sequentially arranged from the object side to the image side along the optical axis O.

[0075] Furthermore, 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 surface S1 and the image side surface S2 of the first lens L1 are concave and convex surfaces respectively near the optical axis O; the object side surface S3 and the image side surface S4 of the second lens L2 are convex and concave surfaces respectively near the optical axis O; the object side surface S5 and the image side surface S6 of the third lens L3 are concave and convex surfaces respectively near the optical axis O; the object side surface S7 and the image side surface S8 of the fourth lens L4 are convex and concave surfaces respectively near the optical axis O.

[0077] Specifically, along the optical axis O of the optical lens 100, the elements from the object side to the image side are arranged sequentially according to the order of the elements in Table 1a from top to bottom. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The Y-radius in Table 1a is the radius of curvature of the object side or image side of the corresponding surface number near the 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 of the lens to the next surface on the optical axis O. The value of the aperture stop STO in the "Thickness" parameter column represents the distance from the aperture stop 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 this value is negative, it indicates that the aperture stop 102 is set on the image side of the vertex of the next surface. If the thickness of the aperture stop STO is positive, the aperture stop STO is on the object side of the vertex of the next surface. It can be understood that the units of Y radius, thickness, focal length, and Y aperture in Table 1a are all mm. And the reference wavelength for the refractive index and Abbe number of each lens in Table 1a is 588nm, and the reference wavelength for the focal length is 950nm.

[0078] Table 1a

[0079]

[0080] Table 1b

[0081] Face 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 aspherical coefficients of the image-side or object-side surfaces of the aspherical lens 100 are given in Table 1b. The numbers 1, 2, 6, 7, 8, and 9 represent object-side surface S1, image-side surface S2, object-side surface S6, image-side surface S7, object-side surface S8, and image-side surface S9, respectively. The numbers K-A20 from top to bottom represent the type of aspherical coefficient, where K represents the conic coefficient, A3 represents the third-order aspherical coefficient, A4 represents the fourth-order aspherical coefficient, A5 represents the fifth-order aspherical coefficient, A6 represents the sixth-order aspherical coefficient, and so on. Furthermore, the formula for the aspherical coefficient is as follows:

[0083]

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

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

[0086] Please see Figure 2 (B) in the middle Figure 2 (B) in the figure represents the 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 represents the focus shift, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). The astigmatism curve represents the meridional imaging plane curvature T and the sagittal imaging plane curvature S, derived from... Figure 2 As can be seen from (B) in the figure, the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0087] Please see Figure 2 (C) in the middle, Figure 2 (C) in the figure 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 represents distortion, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). Figure 2 As can be seen from (C), at a wavelength of 950nm, 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 This is a schematic diagram of the structure of the optical lens 100 according to the second embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a filter G1, and a protective glass G2, which are arranged sequentially along the optical axis O from the object side to the image side.

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

[0091] Other parameters in the second embodiment are given in Table 2a below, and the definitions of each parameter can be derived from the description of the first embodiment above, and will not be repeated here. It is understood that the units for Y-radius, thickness, focal length, and Y-aperture in Table 2a are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 2a is 588 nm, and the reference wavelength for the focal length is 950 nm.

[0092] Table 2a

[0093]

[0094] Table 2b

[0095] Face 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] Please see Figure 4 (A) in the middle Figure 4 (A) in the second embodiment shows the spherical aberration curves of the optical lens 100 at wavelengths of 975nm, 950nm, and 925nm. Figure 4 In (A), the horizontal coordinate along the X-axis represents the focal shift, and the vertical coordinate along the Y-axis represents the normalized field of view. Figure 4 As can be seen from (A) in the second embodiment, the focal point deviation values ​​are all less than 0.1mm, and the spherical aberration values ​​of the optical lens 100 are better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0097] Please see Figure 4 (B) in the middle Figure 4 (B) in the figure shows the light astigmatism diagram of the optical lens 100 in the second embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis represents the focus shift, and the vertical axis along the Y-axis represents the field of view angle, in degrees (deg). The astigmatism curve represents the meridional imaging plane curvature T and the sagittal imaging plane curvature S, derived from... Figure 4 As can be seen from (B) in the figure, the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0098] Please see Figure 4 (C) in the middle, Figure 4 (C) in the figure 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 represents distortion, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). Figure 4 As can be seen from (C), at a wavelength of 950nm, 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 This is a schematic diagram of the structure of the optical lens 100 according to the third embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a filter G1, and a protective glass G2, which are arranged sequentially along the optical axis O from the object side to the image side.

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

[0102] Other parameters in the third embodiment are given in Table 3a below, and the definitions of each parameter can be derived from the description of the foregoing embodiments, and will not be repeated here. It is understood that the units for Y-radius, thickness, focal length, and Y-aperture in Table 3a are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 3a is 588 nm, and the reference wavelength for the focal length is 950 nm.

[0103] Table 3a

[0104]

[0105] Table 3b

[0106]

[0107]

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

[0109] Please see Figure 6 (B) in the middle Figure 6 (B) in the figure shows the 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 represents the focus shift, and the vertical axis along the Y-axis represents the field of view angle, in degrees (deg). The astigmatism curve represents the meridional imaging plane curvature T and the sagittal imaging plane curvature S, derived from... Figure 6As can be seen from (B) in the figure, the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

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

[0111] Fourth embodiment

[0112] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of the optical lens 100 according to the fourth embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a filter G1, and a protective glass G2, which are arranged sequentially along the optical axis O from the object side to the image side.

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

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

[0115] Table 4a

[0116]

[0117] Table 4b

[0118]

[0119]

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

[0121] Please see Figure 8 (B) in the middle Figure 8 (B) in the diagram represents the light astigmatism of the optical lens 100 in the fourth embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis represents the focus shift, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). The astigmatism curve represents the meridional imaging plane curvature T and the sagittal imaging plane curvature S, derived from... Figure 8 As can be seen from (B) in the figure, the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

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

[0123] Fifth Embodiment

[0124] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of an optical lens 100 according to the fifth embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a filter G1, and a protective glass G2, which are arranged sequentially along the optical axis O from the object side to the image side.

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

[0126] The other parameters in the fifth embodiment are given in Table 5a below, and the definitions of each parameter can be derived from the descriptions of the foregoing embodiments, and will not be repeated here. It is understood that the units for Y-radius, thickness, focal length, and Y-aperture in Table 5a are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 5a is 588 nm, and the reference wavelength for the focal length is 950 nm.

[0127] Table 5a

[0128]

[0129] Table 5b

[0130]

[0131]

[0132] Please see Figure 10 (A) in the middle Figure 10 (A) shows the spherical aberration curves of the optical lens 100 in the fifth embodiment at wavelengths of 975 nm, 950 nm, and 925 nm. Figure 10 In (A), the horizontal coordinate along the X-axis represents the focal shift, and the vertical coordinate along the Y-axis represents the normalized field of view. Figure 10 As can be seen from (A) in the fifth embodiment, the focal point deviation values ​​are all less than 0.1mm, and the spherical aberration values ​​of the optical lens 100 are better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0133] Please see Figure 10 (B) in the middle Figure 10 (B) in the diagram represents the light astigmatism of the optical lens 100 in the fifth embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis represents the focus shift, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). The astigmatism curve represents the meridional imaging plane curvature T and the sagittal imaging plane curvature S, derived from... Figure 10 As can be seen from (B) in the figure, the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

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

[0135] Sixth Embodiment

[0136] Please see Figure 11 , Figure 11This is a schematic diagram of the structure of an optical lens 100 according to the sixth embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a filter G1, and a protective glass G2 arranged sequentially along the optical axis O from the object side to the image side.

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

[0138] Other parameters in the sixth embodiment are given in Table 6a below, and the definitions of each parameter can be derived from the descriptions of the foregoing embodiments, and will not be repeated here. It is understood that the units for Y-radius, thickness, focal length, and Y-aperture in Table 6a are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 6a is 588 nm, and the reference wavelength for the focal length is 950 nm.

[0139] Table 6a

[0140]

[0141]

[0142] Table 6b

[0143] Face 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] Please see Figure 12 (A) in the middle Figure 12 (A) shows the spherical aberration curves of the optical lens 100 in the sixth embodiment at wavelengths of 975 nm, 950 nm, and 925 nm. Figure 12 In (A), the horizontal coordinate along the X-axis represents the focal shift, and the vertical coordinate along the Y-axis represents the normalized field of view. Figure 12 As can be seen from (A) in the sixth embodiment, the focal point deviation values ​​are all less than 0.1mm, and the spherical aberration values ​​of the optical lens 100 are better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0145] Please see Figure 12 (B) in the middle Figure 12 (B) in the diagram represents the light astigmatism of the optical lens 100 in the sixth embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis represents the focus shift, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). The astigmatism curve represents the meridional imaging plane curvature T and the sagittal imaging plane curvature S, derived from... Figure 12 As can be seen from (B) in the figure, the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

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

[0147] Seventh Embodiment

[0148] Please see Figure 13 , Figure 13 This is a schematic diagram of the structure of the optical lens 100 according to the seventh embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a filter G1, and a protective glass G2, which are arranged sequentially from the object side to the image side along the optical axis O.

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

[0150] Other parameters in the seventh embodiment are given in Table 7a below, and the definitions of each parameter can be derived from the descriptions of the foregoing embodiments, and will not be repeated here. It is understood that the units for Y-radius, thickness, focal length, and Y-aperture in Table 7a are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 7a is 588 nm, and the reference wavelength for the focal length is 950 nm.

[0151] Table 7a

[0152]

[0153]

[0154] Table 7b

[0155] Face 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] Please see Figure 14 (A) in the middle Figure 14 (A) shows the spherical aberration curves of the optical lens 100 in the seventh embodiment at wavelengths of 975 nm, 950 nm, and 925 nm. Figure 14 In (A), the horizontal coordinate along the X-axis represents the focal shift, and the vertical coordinate along the Y-axis represents the normalized field of view. Figure 14As can be seen from (A) in the seventh embodiment, the focal point deviation values ​​are all less than 0.1mm, and the spherical aberration values ​​of the optical lens 100 are better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0157] Please see Figure 14 (B) in the middle Figure 14 (B) in the diagram represents the light astigmatism of the optical lens 100 in the seventh embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis represents the focus shift, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). The astigmatism curve represents the meridional imaging plane curvature T and the sagittal imaging plane curvature S, derived from... Figure 14 As can be seen from (B) in the figure, the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

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

[0159] Eighth embodiment

[0160] Please see Figure 15 , Figure 15 This is a schematic diagram of the structure of the optical lens 100 according to the eighth embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a filter G1, and a protective glass G2, which are arranged sequentially along the optical axis O from the object side to the image side.

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

[0162] Other parameters in the eighth embodiment are given in Table 8a below, and the definitions of each parameter can be derived from the descriptions of the foregoing embodiments, and will not be repeated here. It is understood that the units for Y-radius, thickness, focal length, and Y-aperture in Table 8a are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 8a is 588 nm, and the reference wavelength for the focal length is 950 nm.

[0163] Table 8a

[0164]

[0165]

[0166] Table 8b

[0167] Face 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] Please see Figure 16 (A) in the middle Figure 16 (A) in the eighth embodiment shows the spherical aberration curves of the optical lens 100 at wavelengths of 975 nm, 950 nm, and 925 nm. Figure 16 In (A), the horizontal coordinate along the X-axis represents the focal shift, and the vertical coordinate along the Y-axis represents the normalized field of view. Figure 16 As can be seen from (A) in the eighth embodiment, the focal point deviation values ​​are all less than 0.1mm, and the spherical aberration values ​​of the optical lens 100 are better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0169] Please see Figure 16 (B) in the middle Figure 16 (B) in the figure is the light astigmatism diagram of the optical lens 100 in the eighth embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis represents the focus shift, and the vertical axis along the Y-axis represents the field of view angle, in degrees (deg). The astigmatism curve represents the meridional imaging plane curvature T and the sagittal imaging plane curvature S, derived from... Figure 16 As can be seen from (B) in the figure, the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.15 mm. At this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0170] Please see Figure 16 (C) in the middle, Figure 16 Figure (C) shows the distortion curve of the optical lens 100 in the eighth embodiment at a wavelength of 950 nm. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). Figure 16 As can be seen from (C), at a wavelength of 950nm, 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 The values ​​of 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] Please see Figure 17 This application also discloses a camera module 200, which includes a photosensitive chip 201 and the aforementioned optical lens 100. The photosensitive chip 201 is disposed on the image side of the optical lens 100. The optical lens 100 is used to receive the light signal of the subject and project it onto the photosensitive chip 201. The photosensitive chip 201 is used to convert the light signal corresponding to the subject into an image signal, which will not be elaborated here. The camera module with the optical lens 100 can achieve a thin and miniaturized design of the optical lens 100, while also giving the optical lens 100 a large image area, thus improving the imaging quality of the optical lens 100.

[0176] Please see Figure 18 This application also discloses a terminal device 300, which includes a housing 301 and the aforementioned camera module 200, with the camera module 200 disposed within the housing 301. The terminal device 300 can be, but is not limited to, a mobile phone, tablet computer, laptop computer, smartwatch, monitor, etc. It is understood that the electronic device 300 with the aforementioned camera module 200 also possesses all the technical effects of the aforementioned optical lens 100, namely, it can achieve a thin and miniaturized design for the optical lens 100, while simultaneously giving the optical lens 100 a large image area, thus 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 solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. An optical lens, characterized in that, There are a total of four lenses with refractive power in the optical lens, and the four lenses include, in order from the object side to the image side along the optical axis: The first lens 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 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 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 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 relational expressions: 65° < FOV < 75°, 1.2 < ImgH / F < 1.4, 1 < SD41 / SD32 < 1.5; Where, FOV is the maximum field angle of the optical lens, ImgH is the diameter of the largest effective imaging circle on the imaging surface of the optical lens, F is the effective focal length of the optical 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.

2. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following relational expressions: 1.7 < TTL / ImgH < 1.9, and / or, 30° < FOV / FNO < 34°, and / or, 2.1 < TTL / F < 2.5; Where, 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 aperture number of the optical lens.

3. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following relational expressions: 1.4 < SD11 / SD21 < 1.7, and / or, 0.9 < SD22 / SD31 < 1.1; Where, 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, and SD31 is the maximum effective aperture of the object side surface of the third lens.

4. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following relational expressions: -4 < (F1 + F2) / F < -1, and / or, -5 < F1 / F < -2, and / or, 2 < F1 / F4 < 6.1; Where, 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 as described in claim 1, characterized in that, The optical lens satisfies the following relational expressions: 3 < ∑CT / ∑AT < 6, and / or, 2 < CT3 / CT4 < 3.4, and / or, 4 < TTL / CT3 < 4.4; Where, ∑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 as described in claim 1, characterized in that, The optical lens satisfies the following relational expressions: 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; where 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 as described in claim 1, characterized in that, 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; where 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 as described in claim 1, characterized in that, 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 a photosensitive chip and the optical lens according to any one of claims 1 - 8, and the photosensitive 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.

Images