Optical lens, camera module and electronic device

Abstract

The application discloses an optical lens, a camera module and electronic equipment, the optical lens comprises a first lens, a second lens, a third lens and a fourth lens, the first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, and the optical lens satisfies the following relationship: 167deg / mm < FOV / SD11 < 203deg / mm, wherein, FOV is the maximum field of view angle of the optical lens, and SD11 is the maximum effective half aperture of the object side of the first lens. The optical lens, the camera module and the electronic equipment provided by the application simultaneously consider the design requirements of small head and large field of view angle, improve the resolution and the definition of the optical lens, and achieve the shooting effect of high pixels.

Description

Technical Field

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

[0002] In recent years, with the rapid update and iteration of electronic devices represented by smartphones, consumers' demand for diversified functions and high imaging quality of optical lenses has been increasing. At present, many electronic devices can place optical lenses on the side of the display screen through a hole-punch design, thereby eliminating large borders, bangs and other structures that affect the screen-to-body ratio of electronic devices. For electronic devices with an under-screen hole design, the head size of the optical lens greatly affects the size of the screen hole. An optical lens with a small head design can reduce the size of the screen hole, which is beneficial to improving the screen-to-body ratio of electronic devices. However, the small head design easily leads to a smaller field of view of the optical lens, making it impossible to obtain more scene information and difficult to meet the needs of large-scale detection. In other words, it is difficult for existing optical lenses to simultaneously meet the design requirements of a small head and a large field of view. Summary of the Invention

[0003] The embodiments of the present invention disclose an optical lens, a camera module, and an electronic device, which can simultaneously meet the design requirements of a small head and a large field of view, improve the resolution and clarity of the optical lens, and achieve a high-pixel shooting effect.

[0004] To achieve the above objectives, the present invention discloses, in a first aspect, an optical lens, comprising four lenses having refractive power, wherein the four lenses having refractive power are, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, and a fourth lens;

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

[0006] The second lens has negative refractive power, the object side surface of the second lens is convex at the near optical axis, and the image side surface of the second lens is concave at the near optical axis;

[0007] The third lens has positive refractive power, the object side surface of the third lens is concave at the near optical axis, and the image side surface of the third lens is convex at the near optical axis;

[0008] The fourth lens element has negative refractive power, the object side surface of the fourth lens element is convex at the near optical axis, and the image side surface of the fourth lens element is concave at the near optical axis;

[0009] The optical lens satisfies the following relationship:

[0010] 167deg / mm<FOV / SD11<203deg / mm;

[0011] Wherein, FOV is the maximum field of view of the optical lens, and SD11 is the maximum effective semi-aperture of the object side of the first lens.

[0012] In the optical lens provided in the present application, the first lens has a positive refractive power, and the object side surface of the first lens is a convex surface at the near optical axis, which can effectively converge light and is conducive to shortening the total optical length of the optical lens, thereby realizing a miniaturized design. The second lens has a negative refractive power, which, when combined with the positive refractive power provided by the first lens, can slow down the change of light, which is conducive to reducing the sensitivity of the optical lens and improving the assembly yield of the optical lens. The third lens has a positive refractive power, which can share the positive refractive power of the first lens and avoid excessive refractive power of a single lens, thereby helping to reduce the sensitivity of the optical lens, and also helps to correct the spherical aberration generated by the first lens and the second lens, thereby improving the imaging quality of the optical lens; the concave-convex surface design of the object side surface and the image side surface of the third lens at the near optical axis, combined with the convex-concave surface design of the object side surface and the image side surface of the second lens at the near optical axis, is conducive to expanding the field of view of the optical lens while reducing the distortion of the optical lens. By providing the fourth lens with negative refractive power and limiting the object-side and image-side surfaces of the fourth lens at the near optical axis to be convex and concave, respectively, the distortion, astigmatism, and field curvature produced by the incident light passing through the first, second, and third lenses can be corrected, thereby achieving high-quality imaging. With the aforementioned refractive power and surface characteristics, the lenses cooperate with each other, which is conducive to miniaturizing the design of the optical lens and achieving good imaging quality, thereby meeting people's requirements for high-definition imaging of optical lenses. With the aforementioned refractive power and surface characteristics, and while satisfying the following relationship: 167deg / mm<FOV / SD11<203deg / mm, when the aforementioned relationship is satisfied, the ratio of the maximum field of view of the optical lens to the radial dimension of the first lens is limited, which is conducive to achieving a small head design for the above-mentioned four-lens optical lens, thereby enabling the optical lens to develop in the direction of miniaturization, reducing the volume occupied by the optical lens, and saving space for the camera module equipped with the optical lens. In addition, when the above relationship is satisfied, the field of view of the optical lens and the amount of light entering can be balanced, that is, when the amount of light entering is constant, the field of view angle of the optical lens can be effectively increased. This not only helps the optical lens obtain more scene information and meet the needs of large-scale detection, but also helps to improve the problem of rapid decrease in relative illumination at the edge caused by a large viewing angle, so that the optical lens has good optical performance and improves the shooting quality of the optical lens. When it is lower than the lower limit of the above relationship, the maximum field of view angle of the optical lens is too small and the aperture of the first lens is too large. Although the optical lens can obtain good image quality, it is difficult to meet the design requirements of small heads; when it exceeds the upper limit of the above relationship, the maximum field of view angle of the optical lens is too large and the aperture of the first lens is too small. Although a smaller head size can be obtained, the maximum field of view angle of the optical lens increases, and it is difficult to obtain good distortion and astigmatism correction in an optical lens with a small number of lenses, resulting in difficulty in designing and manufacturing the optical lens.

[0013] As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship:

[0014] 4.08<f / SD11<4.49; where f is the focal length of the optical lens. The ratio of the focal length of the optical lens to the maximum effective semi-aperture of the object-side surface of the first lens reflects the relative amount of light entering the optical lens. Therefore, by limiting the ratio of the focal length of the optical lens to the maximum effective semi-aperture of the object-side surface of the first lens, the relative amount of light entering the optical lens can be kept within a reasonable range. This allows for a larger entrance pupil diameter while meeting the requirements of a small head design, helping to reduce the aperture number of the optical lens, increase the amount of light entering the optical lens, and improve the image quality of the optical lens. Furthermore, a larger entrance pupil diameter provides more light entering, making it suitable for use as an under-display camera and in low-light scenarios. When the upper limit of the above relationship is exceeded, the radial size of the first lens is reduced, achieving the requirements of a small head design, but the relative amount of light entering the optical lens is reduced, making it difficult to meet the requirements of a large amount of light entering the optical lens, affecting the image quality. When the lower limit of the above relationship is exceeded, the relative amount of light entering the optical lens is guaranteed, but the radial size of the first lens is increased, which is not conducive to achieving a small head design.

[0015] As an optional embodiment, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 0.7<ET1 / CT1<0.9, wherein ET1 is the distance from the maximum effective semi-aperture of the object side surface of the first lens to the maximum effective semi-aperture of the image side surface of the first lens on the optical axis, that is, the edge thickness of the first lens, and CT1 is the thickness of the first lens on the optical axis, that is, the center thickness of the first lens. The ratio of the edge thickness to the center thickness of the first lens reflects the distribution of the thickness and refractive power of the first lens in the direction perpendicular to the optical axis. Therefore, when the above relationship is satisfied, the first lens is a convex lens with a relatively uniform thickness, thick in the middle and thin on both sides. Combined with the positive refractive power provided by the first lens, it helps to shrink light, shorten the total optical length of the optical lens, and achieve a miniaturized design. Furthermore, by complying with the following relationship: 0.51<CT1<0.78, a first lens with a wider edge thickness can be manufactured. This helps ensure that the optical lens has a greater head depth while still meeting the requirements of a small head design. This allows the optical lens to be suitable for electronic devices with certain holes, such as mobile phones or tablets with punch-hole displays and under-screen cameras. When the upper limit of the above conditional expression is exceeded, the refractive power of the first lens is relatively low, making it difficult to provide good light deflection conditions for the optical lens, resulting in a decrease in the optical performance of the optical lens. When the lower limit of the above relationship is exceeded, the edge thickness of the first lens is relatively small, and the optical lens cannot have a large head depth, making it difficult to meet specific head depth design requirements.

[0016] As an optional implementation, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: 0.14 < CT1 / TTL < 0.22; where CT1 is the thickness of the first lens on the optical axis, and TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens, that is, the total optical length of the optical lens.

[0017] When the above relational expression is satisfied, the optical lens has a relatively thick first lens, which is beneficial to enabling the mechanical bearing position of the first lens to move sufficiently in the image side direction to deepen the embedding depth of the lens. At the same time, it is also beneficial to reduce the head diameter of the optical lens and optimize the external shape structure of the optical lens. When the optical lens of the present application is applied to electronic devices such as mobile phones and tablet computers with a display screen, it can improve the design effect of the full screen. In addition, when the above relationship is satisfied, the resistance of the first lens can also be enhanced, so that the first lens is not too thin and is not easily broken, avoiding the influence of the lens being too thin on the strength of the optical lens, thereby being able to better reduce the impact when being collided and improve the manufacturing yield. When exceeding the upper limit of the above relational expression, it will cause insufficient compression of the central thickness of the first lens, which is not conducive to the miniaturization design of the optical lens, or makes the focal length of the optical lens too small, making it difficult to meet the design requirements of the field angle range of the optical lens, unable to obtain sufficient object space information, resulting in missing imaging information and affecting the shooting quality of the optical lens; when exceeding the lower limit of the above relational expression, the total optical length of the optical lens is too large, which is not conducive to the miniaturization design of the optical lens.

[0018] As an optional implementation, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: 0.7 < TTL / (2*ImgH) < 0.9; TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens, that is, the total optical length of the optical lens, and ImgH is the radius of the largest effective imaging circle on the imaging surface of the optical lens, that is, the semi-image height of the optical lens.

[0019] When the above relationship is satisfied, the ratio of the overall optical length to the semi-image height of the optical lens can be controlled within a reasonable range, enabling the optical lens to match a larger image plane. As a result, it can cooperate with a photosensitive chip with a higher pixel count to achieve high-definition imaging, maintain good optical performance of the optical lens, realize the feature of high pixels of the optical lens, and thus be able to capture the details of the photographed object well. While effectively controlling distortion, it can enhance the near-field shooting ability of the optical lens, increase the depth of field of the optical lens, and improve the shooting effect of the optical lens. When below the lower limit of the above relationship, the overall optical length of the optical lens is too small, making the structure of the optical lens too compact, increasing the difficulty of aberration correction, and thus easily leading to a reduction in the imaging performance of the optical lens. When exceeding the upper limit of the above relationship, the image height of the optical lens is too small to match a photosensitive chip of a larger size, affecting the imaging quality of the optical lens.

[0020] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 1.5 < TTL / f < 1.9; 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 f is the focal length of the optical lens.

[0021] By defining the ratio relationship between the overall optical length of the optical lens and the focal length of the optical lens, while satisfying the field angle range of the optical lens, the overall optical length of the optical lens can be controlled within a suitable range to meet the miniaturization design requirements of the optical lens. When exceeding the upper limit of the above relationship, the overall optical length of the optical lens is too long, resulting in an increase in the thickness of the optical lens in the optical axis direction, which is not conducive to the thin, light, and miniaturized design of the optical lens; when below the lower limit of the above relationship, the focal length of the optical lens is too long, making it difficult to meet the design requirements of the field angle range of the optical lens, unable to obtain sufficient object space information, resulting in missing imaging information, affecting the shooting quality of the optical lens, and the overall optical length of the optical lens is too small, which is not conducive to the arrangement of lenses and reduces the assembly efficiency of the optical lens.

[0022] As an alternative embodiment, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: 0.9 < f1 / f < 1.7, where f1 is the focal length of the first lens and f is the focal length of the optical lens. When the above relational expression is satisfied, for the focal length of the entire optical lens, the refractive power of the first lens will not be too strong, and it can correct the high-order spherical aberration, enabling the optical lens to have good imaging quality. In addition, by satisfying the limitation of the above relational expression, it is ensured that the optical lens has a large field-of-view range, the imaging range of the object space of the optical lens can be increased, so that all the optical information from the object space to the image space provided by the first lens for each lens can be captured, enabling the optical lens to obtain more scene content and enriching the imaging information of the optical lens. When exceeding the upper limit of the above relational expression, the focal length of the first lens is too large, resulting in too weak refractive power, which is not conducive to the first lens collecting light from the object side and is not conducive to large-angle light entering the optical lens, causing a decrease in the light passing amount, reducing the field-of-view range of the optical lens, and making it difficult to meet the shooting requirements. When lower than the lower limit of the above relational expression, the focal length of the first lens is too small, resulting in too strong refractive power, which will not only increase the sensitivity of the optical lens, making the processing difficult, but also increase the difficulty of correcting the aberration generated by the first lens, reducing the imaging quality.

[0023] As an alternative embodiment, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression:

[0024] -8.4 < f2 / f < -1.7, where f2 is the focal length of the second lens and f is the focal length of the optical lens. When the limitation of the above relational expression is satisfied, the second lens can be designed as a negative lens, which can provide a negative refractive power for the optical lens, facilitating the expansion of the width of the light beam, so that the large-angle light incident can be effectively expanded after being refracted and converged by the second lens, enabling the large-angle light to be fully transmitted to the imaging surface of the optical lens, obtaining a wider field-of-view range, providing a wider field of view and having a larger entrance pupil to obtain a clear image, which is conducive to reflecting the high-pixel shooting characteristics of the optical lens. At the same time, under the condition of ensuring that the first lens has a positive refractive power and the third lens has a negative refractive power, the axial spherical aberration and optical distortion of the optical lens can be reduced, improving the shooting quality. When exceeding the range of the above relational expression, it is not conducive to the correction of the aberration of the optical lens, reducing the imaging quality. At the same time, it will also cause the weight of the second lens to be relatively large, which is not conducive to the lightweight design of the optical lens, or will increase the processing difficulty of the second lens, which is not conducive to the processing and forming of the second lens.

[0025] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: 0.6 < f3 / f < 1.1, where f3 is the focal length of the third lens and f is the focal length of the optical lens. By optimizing the thickness and surface shape of the third lens, it is beneficial to make the cooperation between the third lens and the second lens, and between the third lens and the fourth lens closer, so as to better meet the assembly requirements of the structural arrangement. Moreover, it can make the thickness configuration of the third lens uniform, which is beneficial to reducing sensitivity and further correcting the off-axis optical distortion of the optical lens. In addition, when the above relational expression is satisfied, the third lens can be designed to have a positive refractive power, which is beneficial to converging the light beam, so that the light beam can pass through the optical lens more smoothly and effectively, thereby controlling the light incident amount of the optical lens, enabling the optical lens to obtain more scene content and enriching the imaging information of the optical lens. When exceeding the upper limit of the above relational expression, the focal length of the third lens is too large, resulting in too weak refractive power, which is not conducive to the third lens collecting the light from the second lens, thus not conducive to large-angle light entering the optical lens, causing a decrease in the light passing amount and reducing the field of view range of the optical lens, making it difficult to meet the shooting requirements. When lower than the lower limit of the above relational expression, the focal length of the third lens is too small, resulting in too strong refractive power, which will not only increase the tolerance and assembly sensitivity of the optical lens, making the processing difficult, but also increase the difficulty of correcting the aberration generated by the third lens, reducing the imaging quality.

[0026] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: 0.7 < |f4 / f| < 1.5; where f4 is the focal length of the fourth lens and f is the focal length of the optical lens. By satisfying the above relational expression, the refractive power of the fourth lens can be reasonably configured, strengthening the light collecting ability of the optical lens. At the same time, the refractive power of the fourth lens can be controlled within a reasonable range, which can correct the spherical aberration, astigmatism and coma generated by the first lens to the third lens, and avoid the fourth lens being too curved, thus being beneficial to the processing and forming of the fourth lens.

[0027] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression:

[0028] -2.4 < f3 / R32 < -2.1; where f3 is the focal length of the third lens, and R32 is the curvature radius of the image side of the third lens at the optical axis. When the above relationship is satisfied, the refractive power and the curvature radius of the third lens are reasonably set, reducing the complexity of the surface shape of the third lens, which is conducive to correcting the field curvature, astigmatism and distortion of the optical lens to a certain extent, and can further correct the high-order aberrations generated by the second lens, improving the imaging quality of the optical lens; at the same time, it is also conducive to reducing the molding difficulty of the third lens. When lower than the upper limit of the above conditional formula, the curvature radius of the image side of the third lens at the optical axis is too small, resulting in the image side of the third lens being too curved, which easily causes poor molding of the image side of the third lens, is not conducive to the engineering manufacturing of the third lens, and affects the manufacturing yield; when lower than the lower limit of the above relationship, the focal length of the third lens is too small and the refractive power is too strong, which will not only increase the tolerance and assembly sensitivity of the optical lens, resulting in difficult processing, but also increase the difficulty of correcting the aberrations generated by the third lens, reducing the imaging quality.

[0029] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 2 < (R41 + R42) / (R41 - R42) < 3.75; where R41 is the curvature radius of the object side of the fourth lens at the optical axis, and R42 is the curvature radius of the image side of the fourth lens at the optical axis. When the above relationship is satisfied, the trend of the thickness ratio of the object side and the image side of the fourth lens can be well controlled, thereby restricting the shape of the fourth lens. In this way, not only can the optical deflection angle borne by the fourth lens be effectively distributed, and the refractive power borne by the fourth lens in the entire optical lens be effectively controlled, so as to control the spherical aberration contribution of the fourth lens within a reasonable range, making the image quality of the on-axis field and off-axis field not significantly degraded due to the contribution of spherical aberration, thereby effectively improving the spherical aberration and high-order coma of the optical lens, and enhancing the optical performance and imaging quality of the optical lens; at the same time, it is also conducive to ensuring the processability of the shape of the fourth lens, ensuring the processing and production of the fourth lens, and enhancing the manufacturing yield of the fourth lens. When exceeding the range defined by the above relationship, the surface shape of the fourth lens is too flat or too curved, increasing the processing difficulty of the fourth lens, increasing the production cost of the fourth lens, and at the same time, it is difficult to fully correct astigmatism, field curvature and distortion, and edge aberrations are easily generated, which is not conducive to the improvement of the image quality of the optical lens.

[0030] As an optional embodiment, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: CT4 / |SAG41|>1.4; CT4 is the thickness of the fourth lens on the optical axis, SAG41 is the sag height of the object side surface of the fourth lens at the maximum effective semi-aperture, that is, SAG41 is the distance from the intersection of the object side surface of the fourth lens and the optical axis to the maximum effective semi-aperture of the object side surface of the fourth lens on the optical axis. The direction from the object side surface of the first lens to the image side surface of the fourth lens is assumed to be the positive direction of the optical axis. When the SAG41 value is negative, it indicates that the projection of the maximum effective aperture of the object side surface of the fourth lens on the optical axis is located to the left of the intersection of the object side surface of the fourth lens and the optical axis. When the SAG41 value is positive, it indicates that the projection of the maximum effective aperture of the object side surface of the fourth lens on the optical axis is located to the right of the intersection of the object side surface of the fourth lens and the optical axis.

[0031] By controlling the ratio of the center thickness of the fourth lens element to the sagittal height of the object-side surface of the fourth lens element, the fourth lens element can be given a suitable lens shape, thereby preventing the object-side surface of the first lens from being excessively curved or too flat, which would increase the manufacturing difficulty of the first lens. This facilitates the manufacturing and molding of the fourth lens element, reduces defects caused by poor molding of the fourth lens, and thus reduces the production cost of the first lens element. At the same time, the field curvature and aberrations generated by the optical lens element can be corrected to balance the field curvature of the optical lens element and improve the imaging quality of the optical lens element.

[0032] In the second aspect, the present invention further discloses a camera module, which includes a photosensitive chip and the optical lens as described in the first aspect above, wherein the photosensitive chip is arranged on the image side of the optical lens. The camera module with the optical lens can effectively increase the field of view of the optical lens while taking into account the design requirements of a small head. This is not only conducive to the optical lens obtaining more scene information and meeting the needs of large-scale detection, but also conducive to improving the problem of a rapid decrease in relative illumination at the edge caused by a large viewing angle, improving the resolution and imaging clarity of the optical lens, and making the optical lens have good optical performance and a higher-definition imaging effect, so as to meet people's requirements for high-definition imaging of the optical lens, thereby improving the imaging quality of the camera module and achieving a high-pixel shooting effect, so that the camera module has a better imaging effect.

[0033] In a third aspect, the present invention further discloses an electronic device, comprising a housing and a camera module as described in the second aspect, wherein the camera module is arranged in the housing. The electronic device having the camera module can effectively increase the field of view of the optical lens while taking into account the design requirements of a small head. This is not only conducive to the optical lens obtaining more scene information and meeting the needs of large-scale detection, but also conducive to improving the problem of a rapid decrease in relative illumination at the edge caused by a large viewing angle, improving the resolution and imaging clarity of the optical lens, and making the optical lens have good optical performance and a higher-definition imaging effect, so as to meet people's requirements for high-definition imaging of the optical lens, thereby improving the imaging quality of the camera module and achieving a high-pixel shooting effect, so that the camera module has a better imaging effect.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The optical lens, camera module and electronic device provided by the embodiment of the present invention adopt a four-piece lens, with a reasonable number of lenses, a clever structure and a small size. Moreover, by selecting a suitable number of lenses and reasonably configuring the refractive power and surface shape of each lens, so that each lens cooperates with each other, it is beneficial for the optical lens to achieve a miniaturized design and have good imaging quality, so as to meet people's high-definition imaging requirements for optical lenses. It has the above-mentioned refractive power and surface shape characteristics and satisfies the following relationship: 167deg / mm<FOV / SD11<203deg / mm. When the above-mentioned relationship is satisfied, the ratio of the maximum field angle of the optical lens to the radial dimension of the first lens is limited, which is beneficial for the above-mentioned optical lens with four-piece lenses to achieve a small head design, so that the optical lens can develop in the direction of miniaturization, reduce the volume occupied by the optical lens, and save space for the camera module equipped with the optical lens. In addition, when the above relationship is satisfied, the field of view of the optical lens and the amount of light entering can be balanced, that is, when the amount of light entering is constant, the field of view angle of the optical lens can be effectively increased. This not only helps the optical lens obtain more scene information and meet the needs of large-scale detection, but also helps to improve the problem of rapid decrease in relative illumination at the edge caused by a large viewing angle, so that the optical lens has good optical performance and improves the shooting quality of the optical lens. When it is lower than the lower limit of the above relationship, the maximum field of view angle of the optical lens is too small and the aperture of the first lens is too large. Although the optical lens can obtain good image quality, it is difficult to meet the design requirements of small heads; when it exceeds the upper limit of the above relationship, the maximum field of view angle of the optical lens is too large and the aperture of the first lens is too small. Although a smaller head size can be obtained, the maximum field of view angle of the optical lens increases, and it is difficult to obtain good distortion and astigmatism correction in an optical lens with a small number of lenses, resulting in difficulty in designing and manufacturing the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 1 is a schematic structural diagram of the optical lens disclosed in the first embodiment of the present application;

[0038] Figure 2 1. The longitudinal spherical aberration diagram, astigmatism curve diagram, and distortion curve diagram of the optical lens disclosed in the first embodiment of the present application;

[0039] Figure 3 2 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;

[0040] Figure 4 1. The longitudinal spherical aberration diagram, astigmatism curve diagram, and distortion curve diagram of the optical lens disclosed in the second embodiment of the present application;

[0041] Figure 5 is a schematic structural diagram of an optical lens disclosed in the third embodiment of the present application;

[0042] Figure 6 : a longitudinal spherical aberration diagram, an astigmatism curve diagram, and a distortion curve diagram of the optical lens disclosed in the third embodiment of the present application;

[0043] Figure 7 2 is a schematic structural diagram of an optical lens disclosed in a fourth embodiment of the present application;

[0044] Figure 8 1. The longitudinal spherical aberration diagram, astigmatism curve diagram, and distortion curve diagram of the optical lens disclosed in the fourth embodiment of the present application;

[0045] Figure 9 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;

[0046] Figure 10 1. The longitudinal spherical aberration diagram, astigmatism curve diagram, and distortion curve diagram of the optical lens disclosed in the fifth embodiment of the present application;

[0047] Figure 11 2 is a schematic structural diagram of an optical lens disclosed in a sixth embodiment of the present application;

[0048] Figure 12 1. The longitudinal spherical aberration diagram, astigmatism curve diagram, and distortion curve diagram of the optical lens disclosed in the sixth embodiment of the present application;

[0049] Figure 13 It is a structural diagram of the camera module disclosed in this application;

[0050] Figure 14 It is a structural schematic diagram of the electronic device disclosed in this application. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0052] In the present invention, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the present invention and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0053] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0054] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0055] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0056] The technical solution of the present invention will be further described below in conjunction with embodiments and drawings.

[0057] See also Figure 1According to a first aspect of the present application, an optical lens 100 is disclosed. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, which are arranged in sequence from the object side to the image side along an optical axis O. During imaging, light rays enter the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 in sequence from the object side of the first lens L1 and are ultimately imaged on an imaging surface 101 of the optical lens 100. The first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, and the fourth lens L4 has negative refractive power.

[0058] Furthermore, the object-side surface S1 of the first lens L1 is convex at the near optical axis, and the image-side surface S2 of the first lens L1 is concave or concave at the near optical axis; the object-side surface S3 of the second lens L2 is convex at the near optical axis, and the image-side surface S4 of the second lens L2 is concave at the near optical axis; the object-side surface S5 of the third lens L3 is concave at the near optical axis, and the image-side surface S6 of the third lens L3 is convex at the near optical axis; the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, and the image-side surface S8 of the fourth lens L4 is concave at the near optical axis.

[0059] Considering that the optical lens 100 is mostly used in electronic devices such as smartphones and smart tablets, or in on-board devices and driving recorders in automobiles, when the optical lens 100 can be used in electronic devices such as smartphones and smart tablets, the material of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 can all be plastic, so that the optical lens 100 has good optical effects while also reducing the overall weight of the optical lens 100, and having good portability and making it easier to process complex lens surfaces. At the same time, the aforementioned first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 can all be aspherical. In addition, it is understandable that in other embodiments, when the optical lens 100 is used as a camera on a car body, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 can all be glass lenses, so that the optical lens 100 has good optical effects while also reducing the temperature sensitivity of the optical lens 100. At the same time, each lens can be spherical.

[0060] In some embodiments, the optical lens 100 further includes a stop 102, which can be an aperture stop or a field stop. The stop 102 can be positioned between any two lenses. For example, the stop 102 can be positioned between the image-side surface S4 of the second lens element L2 and the object-side surface S5 of the third lens element L3. It is understood that in other embodiments, the stop 102 can also be positioned between the object side of the optical lens element 100 and the object-side surface S1 of the first lens element L1. The positioning can be adjusted based on actual circumstances, and this embodiment does not specifically limit this.

[0061] In some embodiments, the optical lens 100 further includes a filter L5, such as an infrared filter. The infrared filter can be disposed between the image-side surface S8 of the fourth lens L4 and the imaging surface 101 of the optical lens 100, thereby filtering out light of other wavelengths, such as visible light, and allowing only infrared light to pass through. Therefore, the infrared filter is selected to improve the imaging quality by filtering out light of other wavelengths, such as visible light, so that the imaging is more in line with the visual experience of the human eye; and the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can also image in dim environments and other special application scenarios and obtain better imaging effects. It is understandable that the filter L5 can be made of optical glass coating, or can be made of colored glass, or a filter of other materials. It can be selected according to actual needs and is not specifically limited in this embodiment.

[0062] In some embodiments, the optical lens 100 satisfies the following relationship: 167 deg / mm<FOV / SD11<203 deg / mm, for example, FOV / SD11=167.117 deg / mm, 167.476 deg / mm, 167.806 deg / mm, 168.406 deg / mm, 168.906 deg / mm, 169.259 deg / mm, 169.604 deg / mm, 200.406 deg / mm, 201.210 deg / mm, 201.703 deg / mm, 202.169 deg / mm, 202.410 deg / mm or 202.899 deg / mm, etc.; wherein FOV is the maximum field of view of the optical lens 100, and SD11 is the maximum effective semi-aperture of the object-side surface S1 of the first lens L1.

[0063] When the above relationship is satisfied, the ratio of the maximum field angle of the optical lens 100 to the radial dimension of the first lens L1 is limited, which is conducive to the realization of a small head design for the above-mentioned optical lens 100 with four lenses, so that the optical lens 100 can be developed in the direction of miniaturization, reducing the volume occupied by the optical lens 100, and saving space for the camera module equipped with the optical lens 100. In addition, when the above relationship is satisfied, the field of view range and the amount of light entering the optical lens 100 can be balanced, that is, when the amount of light entering is constant, the field angle of the optical lens 100 can be effectively increased. This is not only conducive to the optical lens 100 obtaining more scene information and meeting the needs of large-scale detection, but also helps to improve the problem of rapid decrease in relative illumination at the edge caused by a large viewing angle, so that the optical lens 100 has good optical performance, thereby improving the shooting quality of the optical lens 100. When the value is lower than the lower limit of the above relationship, the maximum field angle of the optical lens 100 is too small, and the aperture of the first lens L1 is too large. Although the optical lens 100 can obtain good image quality, it is difficult to meet the design requirements of a small head. When the value exceeds the upper limit of the above relationship, the maximum field angle of the optical lens 100 is too large, and the aperture of the first lens L1 is too small. Although a smaller head size can be obtained, the maximum field angle of the optical lens 100 increases. It is difficult to obtain good distortion and astigmatism correction in the optical lens 100 with a small number of lenses, resulting in difficulty in the design and production of the optical lens 100.

[0064] In some embodiments, the optical lens 100 satisfies the following relationship: 4.08<f / SD11<4.49, for example, f / SD11=4.083, 4.087, 4.115, 4.209, 4.298, 4.315, 4.369, 4.405, 4.458, 4.469, 4.471 or 4.482, etc.; where f is the focal length of the optical lens 100. The ratio of the focal length of the optical lens 100 to the maximum effective semi-aperture of the object-side surface S1 of the first lens L1 reflects the relative amount of light entering the optical lens 100. Therefore, by limiting the ratio of the focal length of the optical lens 100 to the maximum effective semi-aperture of the object-side surface S1 of the first lens L1, the relative amount of light entering the optical lens 100 can be kept within a reasonable range, so that a larger entrance pupil diameter can be obtained while meeting the small head design, which helps to reduce the aperture number of the optical lens 100, increase the amount of light entering the optical lens 100, and improve the imaging quality of the optical lens 100. Moreover, a larger entrance pupil diameter can provide more light entering, which is suitable for use as an under-screen camera and for use in scenes with low light. When the value exceeds the upper limit of the above relationship, the radial size of the first lens L1 is smaller, which can achieve the design requirement of a small head, but the relative amount of light entering the optical lens 100 is reduced, which makes it difficult to meet the design requirement of a large amount of light entering, affecting the shooting quality; and when the value is lower than the lower limit of the above relationship, the relative amount of light entering the optical lens 100 is guaranteed, but the radial size of the first lens L1 is increased, which is not conducive to achieving a small head design for the optical lens 100.

[0065] In some embodiments, the optical lens 100 satisfies the following relationship: 0.7 < ET1 / CT1 < 0.9. For example, ET1 / CT1 = 0.712, 0.738, 0.752, 0.765, 0.774, 0.787, 0.788, 0.795, 0.818, 0.834, 0.850, or 0.898, etc. Here, ET1 is the distance on the optical axis O from the maximum effective semi-aperture of the object side S1 of the first lens L1 to the maximum effective semi-aperture of the image side S2 of the first lens L1, that is, the edge thickness of the first lens L1, and CT1 is the thickness of the first lens L1 on the optical axis O, that is, the center thickness of the first lens L1. The ratio of the edge thickness to the center thickness of the first lens L1 reflects the distribution of the thickness and refractive power of the first lens L1 in the direction perpendicular to the optical axis. Therefore, when the above relationship is satisfied, the first lens L1 is a convex lens with a relatively uniform thickness and thicker in the middle and thinner at both sides. With the positive refractive power provided by the first lens L1, it helps to converge light, shorten the optical total length of the optical lens 100, and achieve miniaturized design. In addition, by coordinating with the following relationship: 0.51 < CT1 < 0.78, a first lens L1 with a relatively wide edge thickness can be manufactured, which helps to make the optical lens 100 have a head with a relatively large depth on the basis of meeting the small head design, so that the optical lens 100 can be applied to electronic devices with certain holes, such as mobile phones or tablets with a hole-digging full-screen display and an under-screen camera. When exceeding the upper limit of the above conditional formula, the refractive power of the first lens L1 is small, and it is difficult to provide good light deflection conditions for the optical lens 100, resulting in a decline in the optical performance of the optical lens 100; while when lower than the lower limit of the above relationship, the proportion of the edge thickness of the first lens L1 is small, and the optical lens 100 cannot have a relatively large head depth, thus it is difficult to meet the specific head depth design requirements.

[0066] In some embodiments, the optical lens 100 satisfies the following relationship: 0.14 < CT1 / TTL < 0.22. For example, CT1 / TTL = 0.1468, 0.1512, 0.1574, 0.1642, 0.1716, 0.1792, 0.1804, 0.1842, 0.1910, 0.2074, 0.2105, or 0.2176, etc.; where CT1 is the thickness of the first lens L1 on the optical axis O, and TTL is the distance on the optical axis O from the object side S1 of the first lens L1 to the imaging surface 101 of the optical lens 100, that is, the optical total length of the optical lens 100.

[0067] When the above relationship is satisfied, the optical lens 100 has a relatively thick first lens L1, which is conducive to moving the mechanical bearing position of the first lens L1 sufficiently towards the image side to deepen the embedding depth of the lens. At the same time, it is also conducive to reducing the head diameter of the optical lens 100 and optimizing the external structure of the optical lens 100. When the optical lens 100 of the present application is applied to electronic devices such as mobile phones and tablet computers with display screens, the design effect of the full-screen is improved. In addition, when the above relationship is satisfied, the resistance of the first lens L1 can also be enhanced, so that the first lens L1 will not be too thin and is not easily broken, avoiding the influence of the too-thin lens on the strength of the optical lens 100, thereby being able to better reduce the impact when being collided and improve the manufacturing yield. When exceeding the upper limit of the above relationship, it will cause insufficient compression of the central thickness of the first lens L1, which is not conducive to the miniaturization design of the optical lens 100, or makes the focal length of the optical lens 100 too small, making it difficult to meet the design requirements of the field angle range of the optical lens 100, unable to obtain sufficient object space information, resulting in missing imaging information and affecting the shooting quality of the optical lens 100; when exceeding the lower limit of the above relationship, the overall optical length of the optical lens 100 is too large, which is not conducive to the miniaturization design of the optical lens 100.

[0068] In some embodiments, the optical lens 100 satisfies the following relationship: 0.7 < TTL / (2*ImgH) < 0.9. For example, TTL / (2*ImgH) = 0.713, 0.738, 0.751, 0.793, 0.811, 0.833, 0.841, 0.849, 0.853, 0.863, 0.878 or 0.895, etc.; TTL is the distance from the object side S1 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis O, that is, the overall optical length of the optical lens 100, and ImgH is the radius of the largest effective imaging circle on the imaging surface 101 of the optical lens 100, that is, the semi-image height of the optical lens 100.

[0069] When the above relationship is satisfied, the ratio of the overall optical length to the semi-image height of the optical lens 100 can be controlled within a reasonable range, so that the optical lens 100 can match a larger image plane, and thus can cooperate with a photosensitive chip with a higher pixel count to achieve high-definition imaging, maintain the good optical performance of the optical lens 100, realize the feature of high pixel count of the optical lens 100, and further be able to capture the details of the photographed object well. While effectively controlling distortion, it can improve the near-shot ability of the optical lens 100, increase the depth of field of the optical lens 100, and improve the shooting effect of the optical lens 100. When it is lower than the lower limit of the above relationship, the overall optical length of the optical lens 100 is too small, making the structure of the optical lens 100 too compact, resulting in increased difficulty in aberration correction, and thus easily leading to a reduction in the imaging performance of the optical lens 100. When it exceeds the upper limit of the above relationship, the image height of the optical lens 100 is too small to match a photosensitive chip with a larger size, affecting the imaging quality of the optical lens 100.

[0070] In some embodiments, the optical lens 100 satisfies the following relationship: 1.5 < TTL / f < 1.9. For example, TTL / f = 1.511, 1.532, 1.558, 1.568, 1.577, 1.582, 1.595, 1.621, 1.738, 1.841, or 1.895, etc.; where TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis O, and f is the focal length of the optical lens 100.

[0071] By defining the ratio relationship between the overall optical length and the focal length of the optical lens 100, while satisfying the field angle range of the optical lens 100, the overall optical length of the optical lens 100 can be controlled within a suitable range to meet the miniaturization design requirements of the optical lens 100. When it exceeds the upper limit of the above relationship, the overall optical length of the optical lens 100 is too long, resulting in an increase in the thickness of the optical lens 100 in the optical axis direction, which is not conducive to the thin, light, and miniaturized design of the optical lens 100; when it is lower than the lower limit of the above relationship, the focal length of the optical lens 100 is too long, making it difficult to meet the design requirements of the field angle range of the optical lens 100, unable to obtain sufficient object space information, resulting in missing imaging information, affecting the shooting quality of the optical lens 100, and the overall optical length of the optical lens 100 is too small, which is not conducive to lens arrangement and reduces the assembly efficiency of the optical lens 100.

[0072] In some embodiments, the optical lens 100 satisfies the following relationship: 0.9 < f1 / f < 1.7. For example, f1 / f = 0.957, 0.959, 1.005, 1.011, 1.006, 1.009, 1.174, 1.296, 1.367, 1.443, 1.529, 1.531, 1.604, 1.644, or 1.691, where f1 is the focal length of the first lens L1 and f is the focal length of the optical lens 100. When the above relationship is satisfied, for the focal length of the entire optical lens 100, the refractive power of the first lens L1 will not be too strong, and it can correct the high-order spherical aberration, making the optical lens 100 have good imaging quality. In addition, by limiting the above relationship, it is ensured that the optical lens 100 has a large field of view range, the imaging range of the object space of the optical lens 100 can be increased, so that all the optical information from the object space to the image space provided by the first lens L1 for each lens can be captured, so that the optical lens 100 can obtain more scene content and enrich the imaging information of the optical lens 100. When exceeding the upper limit of the above relationship, the focal length of the first lens L1 is too large, resulting in too weak refractive power, which is not conducive to the first lens L1 collecting light from the object side and not conducive to large-angle light entering the optical lens 100, causing a decrease in the light passing amount and reducing the field of view range of the optical lens 100, making it difficult to meet the shooting requirements. When below the lower limit of the above relationship, the focal length of the first lens L1 is too small, resulting in too strong refractive power, which will not only increase the sensitivity of the optical lens 100, making processing difficult, but also increase the difficulty of correcting the aberration generated by the first lens L1 and reduce the imaging quality.

[0073] In some embodiments, the optical lens 100 satisfies the following relationship: -8.4 < f2 / f < -1.7. For example, f2 / f = -8.389, -8.388, -8.008, -7.819, -7.236, -6.813, -6.003, -5.817, -5.815, -5.112, -4.917, -4.017, -3.236, -3.235, -2.867, -2.314, -1.968, -1.886, -1.885, -1.773, -1.770, or -1.717, etc. Here, f2 is the focal length of the second lens L2, and f is the focal length of the optical lens 100. When the above relationship is satisfied, the second lens L2 can be designed as a negative lens, which can provide a negative refractive power for the optical lens 100, facilitating the expansion of the width of the light beam, so that the large-angle light rays entering can be effectively widened after being refracted and converged by the second lens L2, enabling the large-angle light rays to be fully transmitted to the imaging surface 101 of the optical lens 100, obtaining a wider field of view range, providing a wider field of view and having a larger entrance pupil to obtain a clear image, thus facilitating the manifestation of the high-pixel shooting characteristics of the optical lens 100. At the same time, under the condition of ensuring that the first lens L1 has a positive refractive power and the third lens L3 has a negative refractive power, the axial spherical aberration and optical distortion of the optical lens 100 can be reduced, improving the shooting quality. When exceeding the range of the above relationship, it is not conducive to the correction of the aberration of the optical lens 100, reducing the imaging quality. At the same time, it will also cause the weight of the second lens L2 to be relatively large, which is not conducive to the lightweight design of the optical lens 100. Or, it will increase the processing difficulty of the second lens L2, which is not conducive to the processing and forming of the second lens L2.

[0074] In some embodiments, the optical lens 100 satisfies the following relationship: 0.6 < f3 / f < 1.1. For example, f3 / f = 0.623, 0.653, 0.652, 0.674, 0.673, 0.676, 0.801, 0.832, 0.839, 0.834, 0.837, 0.915, 1.059, 1.062, or 1.089, etc. Here, f3 is the focal length of the third lens L3, and f is the focal length of the optical lens 100. By optimizing the thickness and surface shape of the third lens L3, it is beneficial to make the cooperation between the third lens L3 and the second lens L2, and between the third lens L3 and the fourth lens L4 closer, so as to better meet the assembly requirements of the structural arrangement. Moreover, it can make the thickness configuration of the third lens L3 uniform, which is beneficial to reducing sensitivity and further correcting the optical distortion of the outer field of the optical lens 100. In addition, when the above relationship is satisfied, the third lens L3 can be designed with a positive refractive power, which is beneficial to converging the light beam, so that the light beam can pass through the optical lens 100 more smoothly and effectively, thereby controlling the light input amount of the optical lens 100, enabling the optical lens 100 to obtain more scene content and enriching the imaging information of the optical lens 100. When exceeding the upper limit of the above relationship, the focal length of the third lens L3 is too large, resulting in too weak refractive power, which is not conducive to the third lens L3 collecting the light from the second lens L2, thus not conducive to large-angle light entering the optical lens 100, causing a decrease in the light passing amount and reducing the field of view range of the optical lens 100, making it difficult to meet the shooting requirements. When lower than the lower limit of the above relationship, the focal length of the third lens L3 is too small, resulting in too strong refractive power, which will not only increase the tolerance and assembly sensitivity of the optical lens 100, making the processing difficult, but also increase the difficulty of correcting the aberration generated by the third lens L3 and reduce the imaging quality.

[0075] In some embodiments, the optical lens 100 satisfies the following relationship: 0.7 < |f4 / f| < 1.5. For example, |f4 / f| = 0.716, 0.734, 0.766, 0.768, 0.774, 0.782, 0.914, 0.916, 1.001, 1.031, 1.032, 1.038, 1.039, 1.116, 1.285, 1.333, 1.335, 1.467, 1.469, or 1.495, etc.; where f4 is the focal length of the fourth lens L4, and f is the focal length of the optical lens 100. By satisfying the above relationship, the refractive power of the fourth lens L4 can be reasonably configured to strengthen the light collection ability of the optical lens 100. At the same time, the refractive power of the fourth lens L4 can be controlled within a reasonable range, which can correct the spherical aberration, astigmatism, and coma generated by the first lens L1 to the third lens L3, while avoiding the fourth lens L4 from being too curved, thus being beneficial to the processing and forming of the fourth lens L4.

[0076] In some embodiments, the optical lens 100 satisfies the following relationship: -2.4 < f3 / R32 < -2.1. For example, f3 / R32 = -2.370, -2.367, -2.346, -2.239, -2.234, -2.316, -2.293, -2.265, -2.240, -2.233, -2.225, -2.183, -2.178, -2.136, -2.107, or -2.102, etc.; where f3 is the focal length of the third lens L3, and R32 is the radius of curvature of the image side S6 of the third lens L3 at the optical axis O. When the above relationship is satisfied, the refractive power and the radius of curvature of the third lens L3 are reasonably set, reducing the complexity of the surface shape of the third lens L3, which is beneficial to correcting the field curvature, astigmatism, and distortion of the optical lens 100 to a certain extent, and can further correct the high-order aberrations generated by the second lens L2, improving the imaging quality of the optical lens 100; at the same time, it is also beneficial to reducing the forming difficulty of the third lens L3. When below the upper limit of the above conditional formula, the radius of curvature of the image side S6 of the third lens L3 at the optical axis O is too small, resulting in the image side S6 of the third lens L3 being too curved, which is likely to cause poor forming of the image side S6 of the third lens L3, being unfavorable for the engineering manufacturing of the third lens L3 and affecting the manufacturing yield; when below the lower limit of the above relationship, the focal length of the third lens L3 is too small, resulting in too strong refractive power, which will not only increase the tolerance and assembly sensitivity of the optical lens 100, causing processing difficulties, but also increase the difficulty of correcting the aberrations generated by the third lens L3, reducing the imaging quality.

[0077] In some embodiments, the optical lens 100 satisfies the following relationship: 2<(R41+R42) / (R41-R42)<3.75, for example, (R41+R42) / (R41-R42)=2.016, 2.134, 2.328, 2.534, 2.634, 3.703, 2.720, 2.721, 2.863, 3.048, 3.179, 3.351, 3.543, 3.613, 3.702, 3.737, or 3.746, etc., wherein R41 is the radius of curvature of the object-side surface S7 of the fourth lens element L4 at the optical axis O, and R42 is the radius of curvature of the image-side surface S8 of the fourth lens element L4 at the optical axis O. When the above relationship is satisfied, the thickness ratio trend of the object-side surface S7 of the fourth lens element L4 and the image-side surface S8 of the fourth lens element L4 can be well controlled, thereby limiting the shape of the fourth lens element L4. In this way, not only can the optical deflection angle borne by the fourth lens element L4 be effectively distributed, but the refractive power borne by the fourth lens element L4 in the entire optical lens 100 can also be effectively controlled, so as to control the spherical aberration contribution of the fourth lens element L4 within a reasonable range, so that the image quality of the on-axis field of view and the off-axis field of view will not be significantly degraded due to the contribution of spherical aberration, thereby effectively improving the spherical aberration and high-order coma of the optical lens element 100, and enhancing the optical performance and imaging quality of the optical lens element 100; at the same time, it is also beneficial to ensure the machinability of the shape of the fourth lens element L4, thereby ensuring the processing and production of the fourth lens element L4 and improving the manufacturing yield of the fourth lens element L4. When the range defined by the above relationship is exceeded, the surface of the fourth lens L4 is too flat or too curved, which increases the difficulty of processing the four lenses and the production cost of the fourth lens L4. At the same time, it is difficult to fully correct astigmatism, field curvature and distortion, and edge aberrations are easily generated, which is not conducive to improving the image quality of the optical lens 100.

[0078] In some embodiments, the optical lens 100 satisfies the following relationship: CT4 / |SAG41|>1.4, for example, CT4 / |SAG41|=1.475, 1.526, 1.608, 1.705, 2.475, 5.126, 9.605, 11.705, 20.175, 33.521, 41.601, 55.706, 62.770, 91.475, 110.7 26, 180.408, 240.705, 300.475, 410.526, 520.608, 690.705, 711.475, 800.526, 920.608, 1008.705, 1100.475, 1340.526, 1558.608, 2004.705, 2578.475, 3001.526, 3318.608, 38 87.705 or 3950.000, etc.; CT4 is the thickness of the fourth lens element L4 on the optical axis O; SAG41 is the sag height of the object-side surface S7 of the fourth lens element L4 at the maximum effective semi-aperture, that is, SAG41 is the distance from the intersection of the object-side surface S7 of the fourth lens element L4 and the optical axis O to the maximum effective semi-aperture of the object-side surface S7 of the fourth lens element L4 on the optical axis O. It is assumed that the direction from the object-side surface S1 of the first lens element L1 to the image-side surface S8 of the fourth lens element L4 is the positive direction of the optical axis O. When SAG41 is negative, it indicates that the projection of the maximum effective aperture of the object-side surface S7 of the fourth lens element L4 on the optical axis O is to the left of the intersection of the object-side surface S7 of the fourth lens element L4 and the optical axis O. When SAG41 is positive, it indicates that the projection of the maximum effective aperture of the object-side surface S7 of the fourth lens element L4 on the optical axis O is to the right of the intersection of the object-side surface S7 of the fourth lens element L4 and the optical axis O.

[0079] By controlling the ratio of the center thickness of the fourth lens L4 to the sag value of the object-side surface S7 of the fourth lens L4, the fourth lens L4 can be given a suitable lens shape, thereby preventing the object-side surface S1 of the first lens L1 from being excessively curved or too flat, which would increase the manufacturing difficulty of the first lens L1. This facilitates the manufacturing and molding of the fourth lens L4, reduces defects caused by poor molding of the fourth lens L4, and thus reduces the production cost of the first lens L1. At the same time, the field curvature and aberrations generated by the optical lens 100 can be corrected to balance the field curvature of the optical lens 100 and improve the imaging quality of the optical lens 100.

[0080] The optical lens 100 of this embodiment will be described in detail below with reference to specific parameters.

[0081] First embodiment

[0082] The structural diagram of the optical lens 100 disclosed in the first embodiment of the present application is as follows: Figure 1As shown, the optical lens 100 includes an aperture 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a filter L5, which are arranged in sequence from the object side to the image side along the optical axis O. The refractive power and materials of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 can be found in the above-mentioned specific embodiments and will not be repeated here.

[0083] Furthermore, the object-side surface S1 of the first lens L1 is convex at the near optical axis, and the image-side surface S2 of the first lens L1 is concave at the near optical axis; the object-side surface S3 of the second lens L2 is convex at the near optical axis, and the image-side surface S4 of the second lens L2 is concave at the near optical axis; the object-side surface S5 of the third lens L3 is concave at the near optical axis, and the image-side surface S6 of the third lens L3 is convex at the near optical axis; the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, and the image-side surface S8 of the fourth lens L4 is concave at the near optical axis.

[0084] Specifically, taking the focal length f=2.27mm, the maximum field of view FOV=93.3deg, the aperture number FNO=2.058, and the total optical length TTL=3.68mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in Table 1 below. The elements along the optical axis O of the optical lens 100 from the object side to the image side are arranged in the order of the elements from top to bottom in Table 1. In the same lens, the surface with a smaller surface number is the object side surface of the lens, and the surface with a larger surface number is the image side surface of the lens. For example, surface numbers 1 and 2 correspond to the object side surface S1 and image side surface S2 of the first lens L1, respectively. The Y radius in Table 1 is the radius of curvature of the object side surface or image side surface 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 surface to the next surface of the lens on the optical axis O. The value in the "Thickness" column for aperture 102 is the distance from aperture 102 to the vertex of the next lens surface (the vertex refers to the intersection of the lens surface with the optical axis O) on optical axis O. By default, the direction from the object side of first lens L1 to the image side of the last lens element is considered the positive direction of optical axis O. A negative value indicates that aperture 102 is positioned to the right of the vertex of the next lens surface. A positive value indicates that aperture 102 is positioned to the left of the vertex of the next lens surface. It should be noted that the units of Y radius, thickness, and focal length in Table 1 are all in mm. The reference wavelength for the focal lengths of the lenses in Table 1 is 555.00 nm, and the reference wavelength for the refractive index and Abbe number of the lenses is 587.60 nm.

[0085] Table 1

[0086]

[0087]

[0088] In the first embodiment, the object-side surface and the image-side surface of any lens among the first lens L1 to the fourth lens L4 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0089]

[0090] Where x is the distance from the vertex of the aspheric surface at a height h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., paraxial curvature c is the reciprocal of the Y radius R in Table 1 above); K is the conic coefficient; Ai is the correction coefficient corresponding to the i-th high-order term of the aspheric surface. Table 2 lists the high-order coefficients A4, A6, A8, A10, A12, and A14 of the various aspheric mirror surfaces that can be used in the first lens L1 through the fourth lens L4 in the first embodiment.

[0091] Table 2

[0092]

[0093] See also Figure 2 (A) in Figure 2 (A) in FIG. 1 shows the longitudinal spherical aberration curves of the optical lens 100 in the first embodiment at wavelengths of 435.00 mm, 470.00 mm, 510.00 nm, 555.00 mm, 610.00 mm, and 650.00 nm. Figure 2 In (A), the horizontal axis along the X-axis represents the focus offset in mm, and the vertical axis along the Y-axis represents the normalized field of view. Figure 2 As can be seen from (A) in FIG. 1 , the spherical aberration value of the optical lens 100 in the first embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0094] See also Figure 2 (B) in Figure 2 (B) is the astigmatism curve of the optical lens 100 in the first embodiment at a wavelength of 555.00 nm. Figure 2 In (B), the horizontal axis along the X-axis represents the focus offset in mm, and the vertical axis along the Y-axis represents the image height in mm. In the astigmatism curve, T represents the curvature of the imaging surface 101 in the tangential direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. Figure 2 As can be seen from (B) in FIG. 1 , at the wavelength of 555.00 nm, the astigmatism of the optical lens 100 is well compensated.

[0095] See also Figure 2 (C) in Figure 2 (C) is the distortion curve of the optical lens 100 in the first embodiment at a wavelength of 555.00 nm. The horizontal axis along the X-axis represents the distortion, and the vertical axis along the Y-axis represents the image height, both in mm. Figure 2 As can be seen from (C) in FIG. 1 , at the wavelength of 555.00 nm, the distortion of the optical lens 100 is well corrected.

[0096] Second embodiment

[0097] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of an optical lens 100 according to a second embodiment of the present application. Optical lens 100 includes an aperture 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a filter L5, arranged in sequence along optical axis O from the object side to the image side. The refractive power and materials of first lens L1, second lens L2, third lens L3, and fourth lens L4 can be found in the description of the above-mentioned specific embodiments and will not be further elaborated here.

[0098] Furthermore, in the second embodiment, the surface shape of each lens is different from that of each lens in the first embodiment in that the image-side surface S2 of the first lens L1 is convex near the optical axis.

[0099] In the second embodiment, the focal length f of the optical lens 100 is 2.26 mm, the maximum field of view FOV of the optical lens 100 is 93.6 degrees, the aperture number FNO of the optical lens 100 is 2.04, and the total optical length TTL of the optical lens 100 is 4.16 mm. The other parameters in this second embodiment are given in Table 3 below, and the definitions of each parameter can be derived from the description of the aforementioned embodiment and are not repeated here. It is understood that the units of the Y radius, thickness, and focal length in Table 3 are all in mm. The reference wavelength of the focal length of each lens in Table 3 is 555.00 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

[0100] Table 3

[0101]

[0102]

[0103] In the second embodiment, Table 4 gives the high-order coefficients of each aspherical mirror surface in the first lens L1 to the fourth lens L4 that can be used in the second embodiment, wherein the surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0104] Table 4

[0105]

[0106] See also Figure 4 (A) in Figure 4 (A) in FIG. 1 shows the longitudinal spherical aberration curves of the optical lens 100 in the second embodiment at wavelengths of 470.00 mm, 510.00 nm, 555.00 mm, 610.00 mm, and 650.00 nm. Figure 4 In (A), the horizontal axis along the X-axis represents the focus offset in mm, and the vertical axis along the Y-axis represents the normalized field of view. Figure 4 As can be seen from (A) in FIG. 1 , the spherical aberration value of the optical lens 100 in the second embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0107] See also Figure 4 (B) in Figure 4 (B) is the astigmatism curve of the optical lens 100 in the second embodiment at a wavelength of 555.00 nm. Figure 4 In (B), the horizontal axis along the X-axis represents the focus offset in mm, and the vertical axis along the Y-axis represents the image height in mm. In the astigmatism curve, T represents the curvature of the imaging surface 101 in the tangential direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. Figure 4 As can be seen from (B) in FIG. 1 , at the wavelength of 555.00 nm, the astigmatism of the optical lens 100 is well compensated.

[0108] See also Figure 4 (C) in Figure 4 (C) is the distortion curve of the optical lens 100 in the second embodiment at a wavelength of 555.00 nm. The horizontal axis along the X-axis represents the distortion, and the vertical axis along the Y-axis represents the image height, both in mm. Figure 4 As can be seen from (C) in FIG. 1 , at the wavelength of 555.00 nm, the distortion of the optical lens 100 is well corrected.

[0109] Third embodiment

[0110] Please refer to Figure 5 , Figure 5 FIG2 shows a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application. Optical lens 100 comprises an aperture 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a filter L5, arranged sequentially along optical axis O from the object side to the image side. The refractive powers and materials of first lens L1, second lens L2, third lens L3, and fourth lens L4 can be found in the description of the above-mentioned specific embodiments and will not be further elaborated here.

[0111] Furthermore, in the third embodiment, the surface shape of each lens is different from that of each lens in the first embodiment in that the image-side surface S2 of the first lens L1 is convex near the optical axis.

[0112] In the third embodiment, the focal length f of the optical lens 100 is 1.85 mm, the maximum field of view FOV of the optical lens 100 is 84.0 degrees, the aperture number FNO of the optical lens 100 is 2.24, and the total optical length TTL of the optical lens 100 is 2.95 mm. The other parameters in the third embodiment are given in Table 5 below, and the definitions of each parameter can be derived from the above description and are not repeated here. It can be understood that the units of the Y radius, thickness, and focal length in Table 5 are all mm. The reference wavelength of the focal length of each lens in Table 5 is 555.00 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

[0113] Table 5

[0114]

[0115] In the third embodiment, Table 6 gives the high-order coefficients of each aspherical mirror surface in the first lens L1 to the fourth lens L4 that can be used in the third embodiment, wherein the surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0116] Table 6

[0117]

[0118]

[0119] See also Figure 6 , Figure 6 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the third embodiment are shown. For their specific definitions, please refer to the second embodiment and will not be repeated here. Figure 6 As can be seen from (A) in FIG, the spherical aberration value of the optical lens 100 in the third embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. Figure 6 As can be seen from (B) in FIG, at a wavelength of 555.00 nm, the astigmatism of the optical lens 100 is well compensated. Figure 6 As can be seen from (C) in FIG. 1 , the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.

[0120] Fourth embodiment

[0121] See also Figure 7, which is a schematic diagram of the structure of an optical lens 100 disclosed in a fourth embodiment of this application. Optical lens 100 comprises an aperture 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a filter L5, arranged in sequence along optical axis O from the object side to the image side. The refractive power and materials of first lens L1, second lens L2, and third lens L3 can be found in the description of the above-mentioned specific embodiments and will not be further elaborated here.

[0122] Furthermore, in the fourth embodiment, the surface shape of each lens is different from that of each lens in the first embodiment in that the image-side surface S2 of the first lens L1 is convex near the optical axis.

[0123] In the fourth embodiment, the focal length f of the optical lens 100 is 1.85 mm, the maximum field of view FOV of the optical lens 100 is 84 degrees, the aperture number FNO of the optical lens 100 is 2.24, and the total optical length TTL of the optical lens 100 is 2.90 mm. The other parameters in this fourth embodiment are given in Table 7 below, and the definitions of each parameter can be derived from the above description and are not repeated here. It is understood that the units of the Y radius, thickness, and focal length in Table 7 are all mm. The reference wavelength of the focal length of each lens in Table 7 is 555.00 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

[0124] Table 7

[0125]

[0126]

[0127] In the fourth embodiment, Table 8 gives the high-order coefficients of each aspherical mirror surface in the first lens L1 to the fourth lens L4 that can be used in the fourth embodiment, wherein the surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0128] Table 8

[0129]

[0130] See also Figure 8 , Figure 8 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the fourth embodiment are shown. For their specific definitions, please refer to the first embodiment and will not be repeated here. Figure 8 As can be seen from (A) in FIG, the spherical aberration value of the optical lens 100 in the fourth embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. Figure 8 As can be seen from (B) in FIG, at a wavelength of 555.00 nm, the astigmatism of the optical lens 100 is well compensated. Figure 8 As can be seen from (C) in FIG. 1 , the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.

[0131] Fifth embodiment

[0132] See also Figure 9 , which is a schematic diagram of the structure of an optical lens 100 disclosed in the fifth embodiment of this application. Optical lens 100 comprises an aperture 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a filter L5, arranged in sequence along optical axis O from the object side to the image side. The refractive power and materials of first lens L1, second lens L2, and third lens L3 can be found in the description of the above-mentioned specific embodiments and will not be further elaborated here.

[0133] Furthermore, in the fifth embodiment, the surface shape of each lens is different from that of each lens in the first embodiment in that the image-side surface S2 of the first lens L1 is convex near the optical axis.

[0134] In the fifth embodiment, the focal length f of the optical lens 100 is 1.85 mm, the maximum field of view FOV of the optical lens 100 is 84.0 degrees, the aperture number FNO of the optical lens 100 is 2.24, and the total optical length TTL of the optical lens 100 is 2.90 mm. The other parameters in the fifth embodiment are given in Table 9 below, and the definitions of the parameters can be derived from the above description and are not repeated here. It is understood that the units of the Y radius, thickness, and focal length in Table 9 are all mm. The reference wavelength of the focal length of each lens in Table 9 is 486.10 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

[0135] Table 9

[0136]

[0137] In the fifth embodiment, Table 10 gives the high-order coefficients of each aspherical mirror surface in the first lens L1 to the fourth lens L4 that can be used in the fifth embodiment, wherein the surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0138] Table 10

[0139]

[0140]

[0141] See also Figure 10 (A) in Figure 10(A) in FIG. 5 shows a longitudinal spherical aberration curve of the optical lens 100 in the fifth embodiment at wavelengths of 404.70 mm, 435.00 mm, 486.10 nm, 546.10 mm, 587.60 mm, and 656.30 nm. Figure 10 In (A), the horizontal axis along the X-axis represents the focus offset in mm, and the vertical axis along the Y-axis represents the normalized field of view. Figure 10 As can be seen from (A) in FIG. 1 , the spherical aberration value of the optical lens 100 in the fifth embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0142] See also Figure 10 (B) in Figure 10 (B) is the astigmatism curve of the optical lens 100 in the fifth embodiment at a wavelength of 486.10 nm. Figure 10 In (B), the horizontal axis along the X-axis represents the focus offset in mm, and the vertical axis along the Y-axis represents the image height in mm. In the astigmatism curve, T represents the curvature of the imaging surface 101 in the tangential direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. Figure 10 As can be seen from (B) in FIG. 1 , at the wavelength of 486.10 nm, the astigmatism of the optical lens 100 is well compensated.

[0143] See also Figure 10 (C) in Figure 10 (C) is the distortion curve of the optical lens 100 in the fifth embodiment at a wavelength of 486.10 nm. The horizontal axis along the X-axis represents the distortion, and the vertical axis along the Y-axis represents the image height, both in mm. Figure 10 As can be seen from (C) in FIG. 1 , the distortion of the optical lens 100 is well corrected at the wavelength of 486.10 nm.

[0144] Sixth embodiment

[0145] See also Figure 11 , which is a schematic diagram of the structure of an optical lens 100 disclosed in the sixth embodiment of this application. Optical lens 100 comprises an aperture 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a filter L5, arranged in sequence along optical axis O from the object side to the image side. The refractive power and materials of first lens L1, second lens L2, and third lens L3 can be found in the description of the above-mentioned specific embodiments and will not be further elaborated here.

[0146] Furthermore, in the sixth embodiment, the surface shape of each lens is different from that of each lens in the first embodiment in that the image-side surface S2 of the first lens L1 is convex near the optical axis.

[0147] In the sixth embodiment, the focal length f of the optical lens 100 is 1.86 mm, the maximum field of view FOV of the optical lens 100 is 83.9 degrees, the aperture number FNO of the optical lens 100 is 2.24, and the total optical length TTL of the optical lens 100 is 2.85 mm. The other parameters in the sixth embodiment are given in Table 11 below, and the definitions of the parameters can be derived from the above description and are not repeated here. It can be understood that the units of the Y radius, thickness, and focal length in Table 11 are all in mm. The reference wavelength of the focal length of each lens in Table 11 is 555.00 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

[0148] Table 11

[0149]

[0150] In the sixth embodiment, Table 12 gives the high-order coefficients of each aspherical mirror surface in the first lens L1 to the fourth lens L4 that can be used in the sixth embodiment, wherein the surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0151] Table 12

[0152]

[0153]

[0154] See also Figure 14 , Figure 14 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the sixth embodiment are shown. For their specific definitions, please refer to the first embodiment and will not be repeated here. Figure 14 As can be seen from (A) in FIG6 , the spherical aberration value of the optical lens 100 in the sixth embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. Figure 14 As can be seen from (B) in FIG, at a wavelength of 555.00 nm, the astigmatism of the optical lens 100 is well compensated. Figure 14 As can be seen from (C) in FIG. 1 , the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.

[0155] Please refer to Table 13, which is a summary of the ratios of various relationship equations in the first to sixth embodiments of the present application.

[0156] Table 13

[0157]

[0158] See also Figure 13This application also discloses a camera module 200, which includes a photosensitive chip 201 and an optical lens 100 as described in any one of the first to sixth embodiments. The photosensitive chip 201 is disposed on the image side of the optical lens 100. The optical lens 100 is configured to receive light signals from a subject and project them onto the photosensitive chip 201. The photosensitive chip 201 is configured to convert the light signals corresponding to the subject into image signals. This will not be described in detail here. It can be understood that the camera module 200 with the optical lens 100 can effectively increase the field of view of the optical lens 100 while taking into account the design requirements of the small head. This is not only conducive to the optical lens 100 obtaining more scene information and meeting the needs of large-scale detection, but also helps to improve the problem of rapid decrease in relative illumination at the edge caused by the large viewing angle, improve the resolution and imaging clarity of the optical lens 100, and make the optical lens 100 have good optical performance and higher-definition imaging effects to meet people's high-definition imaging requirements for the optical lens 100, thereby improving the imaging quality of the camera module 200 and achieving a high-pixel shooting effect, so that the camera module 200 has a better imaging effect. Since the above technical effects have been described in detail in the embodiment of the optical lens 100, they will not be repeated here.

[0159] See also Figure 14 The present application also discloses an electronic device, wherein the electronic device 300 includes a housing 301 and a camera module 200 as described above, wherein the camera module 200 is disposed in the housing 301 to obtain image information. The electronic device 300 may be, but is not limited to, an endoscope, a mobile phone, a tablet computer, a laptop computer, a smart watch, a monitor, or a car. It is understandable that the electronic device with the camera module 200 can effectively increase the field of view of the optical lens while taking into account the design requirements of a small head. This not only helps the optical lens to obtain more scene information and meet the needs of large-scale detection, but also helps to improve the problem of a rapid decrease in relative illumination at the edge caused by a large viewing angle, improve the resolution and imaging clarity of the optical lens, and make the optical lens have good optical performance and a higher-definition imaging effect to meet people's requirements for high-definition imaging of the optical lens, thereby improving the imaging quality of the electronic device 300 and achieving a high-pixel shooting effect, so that the electronic device 300 has a better imaging effect. Since the above technical effects have been described in detail in the embodiment of the optical lens 100, they will not be repeated here.

[0160] The above is a detailed introduction to an optical lens, a camera module, and an electronic device disclosed in an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the optical lens, camera module, and electronic device of the present invention and their core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. An optical lens, characterized in that: The optical lens has a total of four lenses with refractive power. The four lenses with refractive power are, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, and a fourth lens; The first lens has positive refractive power, and the object side surface of the first lens is convex near the optical axis; The second lens has negative 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 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 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 relationship: 167 deg / mm < FOV / SD11 < 203 deg / mm; Where, FOV is the maximum field angle of the optical lens, and SD11 is the maximum effective semi-aperture of the object side surface of the first lens.

2. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: 4.08 < f / SD11 < 4.49; Where, f is the focal length of the optical lens.

3. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: 0.7 < ET1 / CT1 < 0.9; and / or 0.14 < CT1 / TTL < 0.22; Where, ET1 is the distance on the optical axis from the maximum effective semi-aperture of the object side surface of the first lens to the maximum effective semi-aperture of the image side surface of the first lens, CT1 is the thickness of the first lens on the optical axis, and TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens.

4. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: 0.7 < TTL / (2*ImgH) < 0.9; and / or 1.5 < TTL / f < 1.9; Where, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens, ImgH is the radius of the maximum effective imaging circle on the imaging surface of the optical lens, and f is the focal length of the optical lens.

5. The optical lens according to claim 1, wherein: ​ ​ ​ ​ ​ 6. The optical lens according to claim 1, wherein: ​ ​ ​ 7. The optical lens according to claim 1, wherein: ​ ​ ​ 8. The optical lens according to claim 1, wherein: ​ ​ ​ Among them, R41 is the curvature radius of the object side of the fourth lens at the optical axis, R42 is the curvature radius of the image side of the fourth lens at the optical axis, CT4 is the thickness of the fourth lens on the optical axis, and SAG41 is the sag height of the object side of the fourth lens at the maximum effective half-aperture.

9. A camera module, characterized in that: The camera module includes a photosensitive chip and an optical lens as described in any one of claims 1 to 8, and the photosensitive chip is arranged on the image side of the optical lens.

10. An electronic device, characterized in that: The electronic device includes a housing and a camera module as claimed in claim 9, and the camera module is arranged in the housing.

Images