Optical lens, camera module and terminal device

Abstract

The application discloses an optical lens, a camera module and a terminal device. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power, and the object side surface and the image side surface thereof are a convex surface and a concave surface respectively. The second lens has negative refractive power, and the image side surface thereof is a concave surface. The third lens has positive refractive power, and the object side surface thereof is a convex surface. The fourth lens has negative refractive power, and the object side surface and the image side surface thereof are a convex surface and a concave surface respectively. The fifth lens has positive refractive power, and the object side surface and the image side surface thereof are a convex surface and a convex surface respectively. The sixth lens has refractive power, and the image side surface thereof is a convex surface. The optical lens satisfies the following relationship: 199deg / mm<FOV / f<223deg / mm, wherein FOV is the maximum field of view angle of the optical lens, and f is the focal length of the optical lens. The technical scheme of the application can simultaneously meet the shooting effect of a large field of view and miniaturization.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to an optical lens, camera module and terminal device. Background Technology

[0002] With the rapid development of technology, the country is paying increasing attention to road traffic safety and vehicle safety, and the requirements are becoming more and more stringent. Surround view cameras are commonly used in automotive driver assistance technologies. A surround view camera mainly refers to a camera system that uses multiple wide-angle lenses strategically distributed around the vehicle's body. It stitches together bird's-eye views from various directions above the car, allowing the driver to clearly see the images around the vehicle. This effectively prevents accidents such as running over objects while reversing, scraping bumpers and wheel rims. Simultaneously, surround view cameras can also identify parking lane signs, curbs, and nearby vehicles, greatly ensuring driving safety.

[0003] However, the vehicle surround-view cameras in related technologies either have a large size to meet the requirements of a wide field of view, or a small size but the angle cannot meet the requirements, which means that they cannot simultaneously meet the requirements of a wide field of view shooting effect and miniaturization. Summary of the Invention

[0004] This invention discloses an optical lens, a camera module, and a terminal device that can simultaneously meet the requirements of wide-angle shooting and miniaturized design.

[0005] To achieve the above objectives, in a first aspect, the present invention discloses an optical lens comprising six refractive lenses, wherein the six refractive lenses are arranged sequentially from the object side to the image side along the optical axis as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.

[0006] The first lens has negative refractive power, the object side of the first lens is convex near the optical axis, and the image side of the first lens is concave near the optical axis.

[0007] The second lens has negative refractive power. Both the object-side surface and the image-side surface of the second lens are aspherical, and the image-side surface of the second lens is concave near the optical axis.

[0008] The third lens has positive refractive power, and the object side of the third lens is convex near the optical axis;

[0009] The fourth lens has negative refractive power. Both the object-side surface and the image-side surface of the fourth lens are aspherical. 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.

[0010] The fifth lens has a positive refractive power. Both the object side surface and the image side surface of the fifth lens are aspherical surfaces. The object side surface of the fifth lens is convex near the optical axis, and the image side surface of the fifth lens is convex near the optical axis.

[0011] The sixth lens has a refractive power. Both the object side surface and the image side surface of the sixth lens are aspherical surfaces. The image side surface of the sixth lens is convex near the optical axis.

[0012] The optical lens satisfies the following relationship:

[0013] 199 deg / mm < FOV / f < 223 deg / mm; where FOV is the maximum field angle of the optical lens, and f is the focal length of the optical lens.

[0014] In the optical lens provided in this application, the negative refractive power provided by the first lens can couple the light rays of a large field of view into the optical lens. At the same time, the object side surface of the first lens is convex near the optical axis, and the image side surface is concave near the optical axis, which is beneficial to expanding the light collection range. In this way, more light rays can enter the optical lens, which is conducive to capturing the light rays so that the light rays can enter the first lens at a large angle, thereby achieving the field angle required by the optical lens and realizing the fish-eye effect. The second lens with a negative refractive power and an aspherical surface shape, combined with the design that its image side surface is concave near the optical axis, is beneficial to making the light rays incident at a large angle through the first lens enter the second lens smoothly, and at the same time, it can reduce the risk of ghost images generated by the optical lens and correct the aberration generated by the large field of view. The third lens is set with a positive refractive power, and the design that the object side surface of the third lens is convex near the optical axis helps to reasonably configure the negative refractive power of the object side end (the first lens and the second lens) of the optical lens, which is beneficial to reducing the design difficulty and assembly sensitivity of the optical lens and improving the yield. The fourth lens with a negative refractive power and an aspherical surface shape,配合凸凹的面型设计,可分担物侧透镜和像侧透镜的像差校正压力,进一步地,第四透镜的像侧面于近光轴处为凹面,可以和第五透镜的于近光轴处为凸面的物侧面进行胶合,有利于减小光学镜头的色差,有利于缩短焦距,从而缩短光学镜头的光学总长,实现光学镜头的小型化设计;第五透镜为双凸非球面的正屈折力透镜,有利于收束光线,减小光学镜头的总长;具有正屈折力第六透镜,其面型设计为非球面,有利于矫正光学镜头的场曲,提升光学性能。由此可见,采用本申请的光学镜头,能够同时满足大视角的拍摄效果和小型化的设计要求。

[0015] It should be noted that there seems to be an incomplete or incorrect description in the part about the fourth lens in the original text. It says "配合凸凹的面型设计" which is not clear. I have translated it as best as possible based on the existing context. You may need to check and correct this part if necessary.In addition, the optical lens also satisfies the following relationship: 199 deg / mm < FOV / f < 223 deg / mm. By controlling the ratio of the maximum field angle of the optical lens to the effective focal length of the optical lens, the field angle of the optical lens can be increased, the view-finding area of the image of the optical lens can be effectively increased, and the effect of a fish-eye lens can be achieved. Moreover, by appropriately reducing the effective focal length, the overall optical length of the optical lens can be shortened, and the miniaturized design of the optical lens can be achieved. When it is lower than the lower limit of the above relationship, the required field angle of the fish-eye lens cannot be achieved, which affects the view-finding area, and insufficient object space information can be obtained, resulting in incomplete imaging information of the optical lens and affecting the shooting quality of the optical lens. When it exceeds the upper limit of the above relationship, the focal length of the optical lens is too short, resulting in the optical lens being too sensitive, which is not conducive to the design and assembly of the optical lens and reduces the yield rate.

[0016] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 2.73 < ∑CT / CT3 < 4.5; where ∑CT is the sum of the thicknesses of each lens from the first lens to the sixth lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis. By controlling the ratio of the thickness of the third lens to the sum of the thicknesses of each lens of the optical lens, it is beneficial to improve the compactness of the overall structure of the optical lens, thereby facilitating the control of the overall optical length of the optical lens within a reasonable range, facilitating the molding and assembly of each lens, reducing the eccentricity sensitivity of the lens, and facilitating the miniaturized design of the optical lens. When it exceeds the upper limit of the above relationship, the thickness compression of each lens of the optical lens is insufficient, resulting in a relatively large sum of the thicknesses of each lens of the optical lens, which is not conducive to the miniaturized design of the optical lens; when it is lower than the lower limit of the above relationship, the thickness of the third lens is too large, and the eccentricity sensitivity of the third lens increases, which is not conducive to the processing and manufacturing of the third lens.

[0017] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: 1.05 < CT3 / (CT4 + CT5) < 1.25; where CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis. As can be seen from the foregoing, the image side of the fourth lens in the present application can be glued to the object side of the fifth lens to form an optical lens group. By controlling the ratio relationship between the total thickness of the third lens and the glued lens group of the optical lens, it is beneficial to shorten the overall optical length of the optical lens, and it is beneficial to make the overall structure of the optical lens relatively compact, so that the optical lens meets the miniaturization design. When it is lower than the lower limit of the above relational expression, the total thickness of the glued lens group of the optical lens is too large, which is not conducive to the miniaturization design of the optical lens; while when it exceeds the upper limit of the above conditional expression, the thickness of the third lens is too large, resulting in an enhanced eccentricity sensitivity of the third lens, which is not conducive to the production and manufacturing of the third lens.

[0018] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: 14 < FOV / CRA < 18; where CRA is the principal ray incident angle of the marginal field of view. When the above relational expression is satisfied, it can provide the required large field of view angle for the optical lens, and at the same time, it can also reduce the incident angle of light entering the photosensitive chip, improve the photosensitive performance, and achieve the shooting effect of wide angle and high pixel. In addition, it can also make the allowable error value between the principal ray incident angles of each field of view of the optical lens and the principal ray incident angle of the photosensitive chip relatively large, enhancing the adaptability of the optical lens to the photosensitive chip.

[0019] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: 2.6 < Rs6 / SAGs6 < 19.5; where Rs62 is the radius of curvature of the image side of the sixth lens on the optical axis, and SAGs62 is the sagitta of the image side of the sixth lens at the maximum effective radius, that is, SAGs6 is the distance in the optical axis direction from the intersection of the image side of the sixth lens and the optical axis to the maximum effective semi-aperture of the image side of the sixth lens. By default, the direction from the object side of the first lens to the image side of the sixth lens is the positive direction of the optical axis. When the value of SAGs6 is negative, it indicates that the projection of the maximum effective aperture of the image side of the sixth lens on the optical axis is located on the left side of the intersection of the image side of the sixth lens and the optical axis. When the value of SAGs6 is positive, it indicates that the projection of the maximum effective aperture of the image side of the sixth lens on the optical axis is located on the right side of the intersection of the image side of the sixth lens and the optical axis.

[0020] By controlling the ratio of the radius of curvature of the image-side surface of the sixth lens to its sag, the shape of the sixth lens can be controlled. This prevents the image-side surface from becoming too curved or too flat, which would increase manufacturing difficulty and reduce production costs. When the ratio is below the lower limit of the above formula, the image-side surface of the sixth lens becomes too curved, increasing processing difficulty and production costs. Furthermore, an overly curved image-side surface is prone to edge aberrations, hindering image quality improvement. Conversely, when the ratio exceeds the upper limit, the radius of curvature of the image-side surface at the optical axis becomes too large, resulting in an overly flat image-side surface. This makes it difficult to adequately correct astigmatism, field curvature, and distortion, and also increases sensitivity, hindering engineering manufacturing.

[0021] As an optional implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 2.5 < |f3 / f| < 3.5; where f3 is the focal length of the third lens. As described above, the third lens can provide positive refractive power to the optical lens. By reasonably controlling the ratio of the focal length of the third lens to the total focal length of the optical lens, the refractive power of the third lens can be reasonably distributed, which is beneficial for converging the light beam. This allows the light beam to pass through the optical lens more smoothly and effectively, thereby controlling the amount of light entering the optical lens and enabling the optical lens to acquire more scene content, enriching the imaging information of the optical lens. Furthermore, satisfying the above relationship also helps to correct chromatic aberration in the optical lens and facilitates the miniaturization design of the optical lens. When the focal length exceeds the upper limit of the above formula, the third lens's focal length becomes too large, resulting in insufficient refractive power. This hinders the third lens from collecting light from the second lens, thus preventing large-angle light from entering the optical lens, reducing light transmission, and decreasing the field of view of the optical lens, making it difficult to meet shooting requirements. Alternatively, the focal length of the optical lens may be too small, hindering light from entering the image sensor for imaging. Conversely, when the focal length falls below the lower limit of the above formula, the third lens's focal length becomes too small, resulting in excessive refractive power. This not only increases the tolerance and assembly sensitivity of the optical lens, leading to manufacturing difficulties, but also makes it more difficult to correct aberrations generated by the third lens, reducing image quality. Alternatively, the focal length of the optical lens may be too large, resulting in an excessively long overall optical length, which is detrimental to the miniaturization design of the optical lens.

[0022] As an optional implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 7 < (ET2 / ET1)*100 < 36.5; where ET1 is the distance from the maximum effective half-aperture of the object-side surface of the first lens to the maximum effective half-aperture of the image-side surface of the first lens along the optical axis, i.e., the edge thickness of the first lens; and ET2 is the distance from the maximum effective half-aperture of the object-side surface of the second lens to the maximum effective half-aperture of the image-side surface of the second lens along the optical axis, i.e., the edge thickness of the second lens. By controlling the ratio of the edge thicknesses of the second lens to the first lens, light rays incident at large angles from the edge of the first lens can smoothly enter the edge optically effective area of ​​the second lens, which is beneficial for reducing off-axis aberrations. Simultaneously, controlling the edge thicknesses of both the first and second lenses also helps reduce the sensitivity of the optical lens, thereby facilitating the assembly of the optical lens.

[0023] As an optional implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 11<|SD21 / SAGs21|<14; where SD21 is the maximum effective half-aperture of the object-side surface of the second lens, and SAGs21 is the sag of the object-side surface of the second lens at the maximum effective radius, that is, SAGs21 is the distance from the intersection of the object-side surface of the second lens and the optical axis to the maximum effective half-aperture of the object-side surface of the second lens in the direction of the optical axis. By default, the direction from the object-side surface of the second lens to the image-side surface of the third lens is the positive direction of the optical axis. When the value of SAGs21 is negative, it indicates that the projection of the maximum effective aperture of the object-side surface of the second lens on the optical axis is located to the left of the intersection of the object-side surface of the second lens and the optical axis. When the value of SAGs21 is positive, it indicates that the projection of the maximum effective aperture of the object-side surface of the second lens on the optical axis is located to the right of the intersection of the object-side surface of the second lens and the optical axis.

[0024] By controlling the ratio of the half-aperture of the object-side surface of the second lens to the sag value of the object-side surface, it is possible to avoid an excessively large half-aperture of the object-side surface, thereby reducing the risk of ghosting. Simultaneously, it also prevents the object-side surface of the second lens from being too curved or too flat, which would increase the manufacturing difficulty, thus reducing the processing difficulty and production cost of the second lens. When the ratio is below the lower limit of the above formula, the object-side surface of the second lens is too curved, increasing the processing difficulty and production cost. Furthermore, an excessively curved object-side surface is prone to edge aberrations and is not conducive to large-angle light incident on the optical lens, thus affecting the image quality of the optical lens. Conversely, when the ratio exceeds the upper limit of the above formula, the absolute value of the half-aperture of the object-side surface of the second lens is too large, resulting in an excessively large edge region on the object-side surface, which easily generates more stray light, thus increasing the risk of ghosting and also increasing the sensitivity of the second lens, which is detrimental to its engineering manufacturing.

[0025] As an optional implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 4.0 < |f6 / f| < 9; where f6 is the focal length of the sixth lens. As described above, the sixth lens can provide negative or positive refractive power to the optical lens. By controlling the ratio of the focal length of the sixth lens to the focal length of the optical lens, it is beneficial to correct the field curvature of the optical lens, improve the imaging resolution of the lens, and also to control the back focal length of the optical lens, thereby allowing as much light as possible to enter the imaging plane, thus increasing the relative illumination of the optical lens. When the upper limit of the above relationship is exceeded, the absolute value of the focal length of the sixth lens becomes large, and the refractive power of the sixth lens becomes too small, resulting in insufficient refraction angle of light, making it difficult to fully correct astigmatism, field curvature, and distortion, and easily increasing aberrations in the off-axis field of view; while when it is below the lower limit of the above conditional expression, the absolute value of the focal length of the optical lens becomes too large, resulting in an excessively long optical length of the optical lens, which is not conducive to the miniaturization design of the optical lens.

[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: 11 mm < |f3 * f6 / f| < 27 mm; where f3 is the focal length of the third lens; f6 is the focal length of the sixth lens. As can be seen from the foregoing, the third lens can provide a positive refractive power for the optical lens, and the sixth lens can provide a positive refractive power or a negative refractive power for the optical lens. By reasonably controlling the ratio relationship between the product of the focal lengths of the third lens and the sixth lens and the total focal length of the optical lens, it is beneficial to overall correct the field curvature and aberration of the optical lens, so as to avoid large field curvature and aberration of local lenses from affecting the imaging quality of the optical lens, thereby ensuring the imaging resolution of the optical lens. When it is lower than the lower limit of the above relational expression, since the refractive power provided by the third lens is positive, and at this time the refractive power provided by the sixth lens is negative, the absolute value of the focal length of the sixth lens is too large, and the refractive power of the sixth lens is too small, resulting in insufficient deflection angle of light rays, resulting in too long optical total length of the optical lens, which is not conducive to the miniaturized design of the optical lens; and when it exceeds the upper limit of the above relational expression, the refractive powers provided by the third lens and the sixth lens are both positive, then the positive focal lengths jointly provided by the third lens and the sixth lens are too small, easily resulting in too large overall refractive power intensity of the optical lens, making the deflection angle of light rays larger, and thus easily increasing the aberration of the off-axis field of view.

[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: 5.5 mm < TTL / FNO < 7 mm; 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, that is, the optical total length of the optical lens, and FNO is the aperture number of the optical lens. By reasonably controlling the ratio relationship between the optical total length of the optical lens and the aperture number of the optical lens, it is beneficial to meet the miniaturized design of the optical lens and increase the light input amount of the optical lens, thereby improving the imaging resolution. When it is lower than the lower limit of the above relational expression, the aperture number of the optical lens is too large, resulting in insufficient light transmission amount of the optical lens, and easily increasing the risk of vignetting; and when it exceeds the upper limit of the above relational expression, the optical total length of the optical lens is too long, which is not conducive to the miniaturized design of the optical lens.

[0028] As an alternative embodiment, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 4.7mm < (f / FNO) * 10 < 5.2mm; where FNO is the aperture number of the optical lens. By reasonably controlling the ratio relationship between the focal length and the aperture number of the optical lens, it is beneficial to make the optical lens have a larger light transmission aperture, thereby facilitating an increase in the light input of the optical lens, and further improving the illuminance of the imaging surface and enhancing the imaging resolution. When it is lower than the lower limit of the above relationship, the aperture number of the optical lens is too large, resulting in insufficient light transmission of the optical lens and an increased risk of vignetting; when it exceeds the upper limit of the above relationship, the focal length of the optical lens is too long, which is not conducive to the effective deflection of light and the miniaturization design of the optical lens.

[0029] As an alternative embodiment, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 22.5 < TTL / (f / FNO) < 28.5; where TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, and FNO is the aperture number of the optical lens. By reasonably controlling the ratio relationship between the total optical length of the optical lens and the ratio of the focal length to the aperture number, it is beneficial to meet the miniaturization design of the optical lens, that is, the optical lens can have a smaller aperture and a shorter total optical length, and at the same time can also increase the light input of the optical lens, which is beneficial to improving the imaging resolution of the imaging surface; in addition, when the above relationship is satisfied, it can also make the optical lens have a compact and reasonable spatial layout, so that light can be deflected fully and reasonably, thereby correcting field curvature, aberration, etc. of the optical lens and improving the imaging quality. When it is lower than the lower limit of the above relationship, the light transmission aperture of the optical lens is too large, resulting in too much light transmission of the optical lens and an increased risk of image plane exposure; when it exceeds the upper limit of the above relationship, the total optical length of the optical lens is too long, which is not conducive to the miniaturization design of the optical lens.

[0030] In a second aspect, the present invention also discloses an imaging module, the imaging module includes a photosensitive chip and the optical lens as described in the first aspect above, and the photosensitive chip is disposed on the image side of the optical lens. The imaging module having the optical lens can simultaneously meet the shooting effect of a large viewing angle and the design requirements of miniaturization.

[0031] In a third aspect, the present invention also discloses a terminal device, the terminal device includes a housing and the imaging module as described in the second aspect above, and the imaging module is disposed in the housing. The terminal device having the imaging module can simultaneously meet the shooting effect of a large viewing angle and the design requirements of miniaturization.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] The optical lens, camera module, and terminal device provided by the embodiments of the present invention. The optical lens adopts a six-piece lens, with a reasonable number of lenses, a clever structure, and a small volume. Moreover, by selecting an appropriate number of lenses and reasonably configuring the refractive power and surface shape of each lens, it is possible to achieve a small-sized design of the optical lens while having a large field-of-view shooting effect. In addition, the optical lens also satisfies the following relationship: 199 deg / mm < FOV / f < 223 deg / mm. By controlling the ratio relationship between the maximum field of view of the optical lens and the effective focal length of the optical lens, the field of view of the optical lens can be increased, effectively improving the viewing area of the image of the optical lens and achieving the effect of a fish-eye lens. And by appropriately reducing the effective focal length, the overall optical length of the optical lens can be shortened, realizing the small-sized design of the optical lens. When below the lower limit of the above relationship, the required field of view of the fish-eye lens cannot be achieved, affecting the viewing area, and insufficient object space information cannot be obtained, resulting in incomplete imaging information of the optical lens and affecting the shooting quality of the optical lens. When exceeding the upper limit of the above relationship, the focal length of the optical lens is too short, resulting in the optical lens being too sensitive, which is not conducive to the design and assembly of the optical lens and reduces the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 is a schematic structural diagram of the optical lens disclosed in the first embodiment of the present application;

[0036] Figure 2 is the longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical lens disclosed in the first embodiment of the present application;

[0037] Figure 3 is a schematic structural diagram of the optical lens disclosed in the second embodiment of the present application;

[0038] Figure 4 is the longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical lens disclosed in the second embodiment of the present application;

[0039] Figure 5 is a schematic structural diagram of the optical lens disclosed in the third embodiment of the present application;

[0040] Figure 6 is the longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical lens disclosed in the third embodiment of the present application;

[0041] Figure 7This is a schematic diagram of the structure of the optical lens disclosed in the fourth embodiment of this application;

[0042] Figure 8 These are the longitudinal spherical aberration diagram, astigmatism curve diagram, and distortion curve diagram of the optical lens disclosed in the fourth embodiment of this application;

[0043] Figure 9 This is a schematic diagram of the structure of the optical lens disclosed in the fifth embodiment of this application;

[0044] Figure 10 These are the longitudinal spherical aberration diagram, astigmatism curve diagram, and distortion curve diagram of the optical lens disclosed in the fifth embodiment of this application;

[0045] Figure 11 This is a schematic diagram of the structure of the optical lens disclosed in the sixth embodiment of this application;

[0046] Figure 12 These are the longitudinal spherical aberration diagram, astigmatism curve diagram, and distortion curve diagram of the optical lens disclosed in the sixth embodiment of this application;

[0047] Figure 13 This is a schematic diagram of the camera module disclosed in this application;

[0048] Figure 14 This is a schematic diagram of the structure of a smart terminal disclosed in this application;

[0049] Figure 15 This is another structural diagram of the smart terminal disclosed in this application. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0052] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0053] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0054] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0055] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0056] Please see Figure 1 According to a first aspect of this application, an optical lens 100 is disclosed. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged sequentially from the object side to the image side along the optical axis O. During imaging, light rays enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 sequentially from the object side of the first lens L1 and are finally imaged onto the imaging plane 101 of the optical lens 100. The first lens L1 has negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L1 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has either positive or negative refractive power. Furthermore, the first lens L1 and the third lens L3 can both be made of glass and can both be spherical; the second lens L2, the fourth lens L4 to the sixth lens L6 can all be made of plastic and can all be aspherical. By limiting some lenses to glass lenses and others to plastic lenses, it is beneficial to reduce the manufacturing cost of the optical lens 100.

[0057] Furthermore, the object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 of the first lens L1 is concave near the optical axis; the object-side surface S3 of the second lens L2 is either convex or concave near the optical axis, and the image-side surface S4 of the second lens L2 is concave near the optical axis; the object-side surface S5 of the third lens L3 is convex near the optical axis, and the image-side surface S6 of the third lens L3 is either convex or concave near the optical axis; the object-side surface S7 of the fourth lens L4 is convex near the optical axis, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis; the object-side surface S9 of the fifth lens L5 is convex near the optical axis, and the image-side surface S10 of the fifth lens L5 is convex near the optical axis; the object-side surface S11 of the sixth lens L6 is either convex or concave near the optical axis, and the image-side surface S12 of the sixth lens L6 is convex near the optical axis.

[0058] In some embodiments, the optical lens 100 further includes an aperture stop 102, which can be an aperture stop or a field stop. It can be positioned between any two lenses; for example, the aperture stop 102 can be positioned between the image-side surface S6 of the third lens L3 and the object-side surface S7 of the fourth lens L4. It is understood that in other embodiments, the aperture stop 102 can also be positioned between the object-side surface of the optical lens 100 and the object-side surface S1 of the first lens L1, depending on the actual situation. This embodiment does not specifically limit this.

[0059] In some embodiments, the optical lens 100 further includes a filter L7, such as an infrared cut-off filter. The infrared filter can be disposed between the image-side surface S12 of the sixth lens L6 and the imaging surface 101 of the optical lens 100, thereby filtering out light of other wavelengths such as infrared light and allowing only visible light to pass through, making the image more consistent with the visual experience of the human eye. Of course, an infrared bandpass filter can also be used. By filtering out light of other wavelengths such as visible light and allowing only infrared light to pass through, the low-light imaging quality can be improved; and the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can also image and obtain better image effects in dim environments and other special application scenarios. It is understood that the filter L7 can be made of optical glass coating, colored glass, or other materials, and can be selected according to actual needs. This embodiment does not make specific limitations.

[0060] In some embodiments, the optical lens 100 satisfies the following relationship: 199 deg / mm < FOV / f < 223 deg / mm. For example, FOV / f = 199.120 deg / mm, 199.480 deg / mm, 210.180 deg / mm, 212.780 deg / mm, 213.970 deg / mm, 215.140 deg / mm, 216.370 deg / mm, 217.666 deg / mm, 217.876 deg / mm, 217.830 deg / mm, 218.059 deg / mm, 221.006 deg / mm, 222.060 deg / mm, or 222.890 deg / mm, etc.; where FOV is the maximum field of view angle of the optical lens 100, and f is the focal length of the optical lens 100. By controlling the ratio relationship between the maximum field of view angle of the optical lens 100 and the effective focal length of the optical lens 100, the field of view angle of the optical lens 100 can be increased, the viewfinder area of the image of the optical lens 100 can be effectively increased, and the fisheye effect can be achieved; and by appropriately reducing the effective focal length, the overall optical length of the optical lens 100 can be shortened, and the miniaturized design of the optical lens 100 can be achieved. When below the lower limit of the above relationship, the required field of view angle of the fisheye lens cannot be achieved, affecting the viewfinder area, and insufficient object space information can be obtained, resulting in incomplete imaging information of the optical lens 100 and affecting the shooting quality of the optical lens 100. When exceeding the upper limit of the above relationship, the focal length of the optical lens 100 is too short, resulting in the optical lens 100 being too sensitive, which is not conducive to the design and assembly of the optical lens 100 and reduces the yield.

[0061] In some embodiments, the optical lens 100 satisfies the following relationship: 2.73 < ∑CT / CT3 < 4.5. For example, ∑CT / CT3 = 2.735, 2.747, 2.751, 2.760, 2.773, 2.788, 3.173, 3.333, 3.578, 3.710, 3.879, 3.937, 4.173, 4.256, 4.379, or 4.478, etc.; where ∑CT is the sum of the thicknesses of each of the first lens L1 to the sixth lens L6 on the optical axis, and CT3 is the thickness of the third lens L3 on the optical axis. By controlling the ratio relationship between the thickness of the third lens L3 and the sum of the thicknesses of each lens of the optical lens 100, it is beneficial to improve the compactness of the overall structure of the optical lens 100, thereby facilitating the control of the overall optical length of the optical lens 100 within a reasonable range, facilitating the molding and assembly of each lens, reducing the eccentricity sensitivity of the lens, and facilitating the miniaturized design of the optical lens 100. When exceeding the upper limit of the above relationship, it will cause insufficient compression of the thicknesses of each lens of the optical lens 100, resulting in a relatively large sum of the thicknesses of each lens of the optical lens 100, which is not conducive to the miniaturized design of the optical lens 100; while when below the lower limit of the above relationship, the thickness of the third lens L3 is too large, and the eccentricity sensitivity of the third lens L3 increases, which is not conducive to the processing and manufacturing of the third lens L3.

[0062] In some embodiments, the optical lens 100 satisfies the following relationship: 1.05 < CT3 / (CT4 + CT5) < 1.25. For example, CT3 / (CT4 + CT5) = 1.059, 1.066, 1.071, 1.085, 1.0918, 1.201, 1.217, 1.224, 1.227, 1.227, 1.230, 1.240, or 1.247, etc.; where CT3 is the thickness of the third lens L3 on the optical axis, CT4 is the thickness of the fourth lens L4 on the optical axis, and CT5 is the thickness of the fifth lens L5 on the optical axis. As can be seen from the foregoing, the image side surface S8 of the fourth lens L4 of the present application can be glued to the object side surface S9 of the fifth lens L5 to form an optical lens group. By controlling the ratio relationship between the third lens L3 and the total thickness of the glued lens group of the optical lens 100, it is beneficial to shorten the overall optical length of the optical lens 100, and it is beneficial to make the overall structure of the optical lens 100 relatively compact, so that the optical lens 100 meets the miniaturized design. When below the lower limit of the above relationship, the total thickness of the glued lens group of the optical lens 100 is relatively large, which is not conducive to the miniaturized design of the optical lens 100; while when exceeding the upper limit of the above conditional formula, the thickness of the third lens L3 is too large, resulting in an enhanced eccentricity sensitivity of the third lens L3, which is not conducive to the production and manufacturing of the third lens L3.

[0063] In some embodiments, the optical lens 100 satisfies the following relationship: 14 < FOV / CRA < 18; where CRA is the chief ray angle of incidence of the marginal field of view. When the above relationship is satisfied, a large field of view required for the optical lens 100 can be provided, and at the same time, the incident angle of light entering the photosensitive chip can be reduced, the photosensitive performance can be improved, and the shooting effects of wide-angle and high pixels can be achieved. In addition, the allowable error value between the chief ray angle of incidence of each field of view of the optical lens 100 and the chief ray angle of incidence of the photosensitive chip can be made relatively large, improving the adaptability of the optical lens 100 to the photosensitive chip.

[0064] In some embodiments, the optical lens 100 satisfies the following relationship: 2.6 < Rs6 / SAGs6 < 19.5. For example, Rs6 / SAGs6 = 2.603, 2.606, 2.630, 2.651, 2.677, 2.953, 3.351, 4.103, 5.351, 6.953, 8.256, 9.383, 10.553, 11.553, 12.853, 13.453, 15.752, 16.458, 17.816, 18.257, 19.153 or 19.456, etc.; where Rs62 is the radius of curvature of the image side S12 of the sixth lens L6 on the optical axis, and SAGs62 is the sag of the image side S12 of the sixth lens L6 at the maximum effective radius. That is, SAGs6 is the distance in the optical axis direction from the intersection of the image side S12 of the sixth lens L6 and the optical axis to the maximum effective semi-aperture of the image side S12 of the sixth lens L6. It is default that the direction from the object side S1 of the first lens L1 to the image side S12 of the sixth lens L6 is the positive direction of the optical axis. When the value of SAGs6 is negative, it indicates that the projection of the maximum effective aperture of the image side S12 of the sixth lens L6 on the optical axis is on the left side of the intersection of the image side S12 of the sixth lens L6 and the optical axis. When the value of SAGs6 is positive, it indicates that the projection of the maximum effective aperture of the image side S12 of the sixth lens L6 on the optical axis is on the right side of the intersection of the image side S12 of the sixth lens L6 and the optical axis.

[0065] By controlling the ratio of the radius of curvature of the image-side surface S12 of the sixth lens L6 to its sagittal value, it is beneficial to control the shape of the sixth lens L6. This avoids the image-side surface S12 of the sixth lens L6 being too curved or too flat, which would increase the manufacturing difficulty of the sixth lens L6 and thus reduce its production cost. When the value is below the lower limit of the above relationship, the image-side surface S12 of the sixth lens L6 is too curved, which increases the processing difficulty of the sixth lens L6 and increases its production cost. At the same time, an overly curved image-side surface S12 is prone to edge aberrations, which is not conducive to improving the image quality of the optical lens 100. When the value exceeds the upper limit of the above conditional expression, the radius of curvature of the image-side surface S12 of the sixth lens L6 at the optical axis is too large, resulting in an overly flat image-side surface S12. This makes it difficult to fully correct astigmatism, field curvature, and distortion, and also easily increases the sensitivity of the sixth lens L6, which is not conducive to its engineering manufacturing.

[0066] In some embodiments, the optical lens 100 satisfies the following relationship: 2.5 < |f3 / f| < 3.5, for example, |f3 / f| = 2.525, 2.662, 2.769, 3.172, 3.173, 3.200, 3.292, 3.311, 3.417, or 2.486, etc.; where f3 is the focal length of the third lens L3. As mentioned above, the third lens L3 can provide positive refractive power to the optical lens 100. By reasonably controlling the ratio of the focal length of the third lens L3 to the total focal length of the optical lens 100, the refractive power of the third lens L3 can be reasonably distributed, which is beneficial to converging the light beam. This allows the light beam to pass through the optical lens 100 more smoothly and effectively, thereby controlling the amount of light entering the optical lens 100 so that the optical lens 100 can acquire more scene content and enrich the imaging information of the optical lens 100. Furthermore, satisfying the above-mentioned relationship is beneficial for correcting chromatic aberration in the optical lens 100 and for achieving miniaturization of the optical lens 100. However, when the upper limit of the above-mentioned relationship is exceeded, the focal length of the third lens L3 becomes too large, resulting in weak refractive power. This is not conducive to the third lens L3 collecting light from the second lens L2, thus hindering the entry of large-angle light into the optical lens 100, causing a decrease in light transmission, reducing the field of view of the optical lens 100, and making it difficult to meet shooting requirements. Alternatively, the focal length of the optical lens 100 may be too small, hindering light from entering the image sensor for imaging. Conversely, when the focal length is below the lower limit of the above-mentioned relationship, the focal length of the third lens L3 becomes too small, resulting in excessive refractive power. This not only increases the tolerance and assembly sensitivity of the optical lens 100, leading to manufacturing difficulties, but also increases the difficulty of correcting aberrations generated by the third lens L3, reducing image quality. Alternatively, the focal length of the optical lens 100 may be too large, resulting in an excessively long optical length, which is not conducive to the miniaturization of the optical lens 100.

[0067] In some embodiments, the optical lens 100 satisfies the following relationship: 7 < (ET2 / ET1)*100 < 36.5, for example, (ET2 / ET1)*100 = 7.02, 7.07, 7.09, 8.15, 8.97, 9.06, 12.93, 14.09, 16.33, 20.25, 25.58, 27.22, 30.28, 31.07, 33.11, 34.19, 35.97, 3 6.23 or 36.47; where ET1 is the distance along the optical axis from the maximum effective half-aperture of the object-side surface S1 of the first lens L1 to the maximum effective half-aperture of the image-side surface S2 of the first lens L1, i.e., the edge thickness of the first lens L1; ET2 is the distance along the optical axis from the maximum effective half-aperture of the object-side surface S3 of the second lens L2 to the maximum effective half-aperture of the image-side surface S4 of the second lens L2, i.e., the edge thickness of the second lens L2. By controlling the ratio of the edge thicknesses of the second lens L2 to the first lens L1, light rays incident at large angles from the edge of the first lens L1 can smoothly enter the edge optically effective area of ​​the second lens L2, which is beneficial to reducing off-axis aberrations. At the same time, controlling the edge thicknesses of the first lens L1 and the second lens L2 is also beneficial to reducing the sensitivity of the optical lens 100, thereby facilitating the assembly of the optical lens 100.

[0068] In some embodiments, the optical lens 100 satisfies the following relationship: 11 < |SD21 / SAGs21| < 14, for example, |SD21 / SAGs21| = 11.630, 12.049, 12.373, 12.759, 12.787, 13.116, 13.248, 13.735, 13.765, or 13.914, etc.; where SD21 is the maximum effective half-aperture of the object-side surface S3 of the second lens L2, and SAGs21 is the sag of the object-side surface S3 of the second lens L2 at the maximum effective radius, that is, SAGs21 is the sag of the object-side surface S3 of the second lens L2 at the maximum effective radius. 3 is the distance from the intersection of the object side surface S3 of the second lens L2 with the optical axis to the maximum effective half-aperture of the object side surface S3 of the second lens L2 in the direction of the optical axis. By default, the direction from the object side surface S3 of the second lens L2 to the image side surface S6 of the third lens L3 is the positive direction of the optical axis. When the value of SAGs21 is negative, it indicates that the projection of the maximum effective aperture of the object side surface S3 of the second lens L2 on the optical axis is located to the left of the intersection of the object side surface S3 of the second lens L2 with the optical axis. When the value of SAGs21 is positive, it indicates that the projection of the maximum effective aperture of the object side surface S3 of the second lens L2 on the optical axis is located to the right of the intersection of the object side surface S3 of the second lens L2 with the optical axis.

[0069] By controlling the ratio of the half-aperture of the object side surface S3 of the second lens L2 to the sag value of the object side surface S3 of the second lens L2, it is possible to avoid the half-aperture of the object side surface of the second lens L2 being too large, thereby helping to reduce the risk of ghosting; at the same time, it is also possible to avoid the object side surface S3 of the second lens L2 being too curved or too flat, which would increase the manufacturing difficulty of the second lens L2, thereby reducing the processing difficulty of the second lens L2 and lowering the production cost of the second lens L2. When the curvature is below the lower limit of the above-mentioned relationship, the object-side surface S3 of the second lens L2 is too curved, which increases the processing difficulty of the second lens L2 and increases the production cost of the second lens L2. At the same time, the excessive curvature of the object-side surface S3 of the second lens L2 is prone to edge aberrations and is not conducive to large-angle light entering the optical lens 100, thus affecting the image quality of the optical lens 100. When the curvature exceeds the upper limit of the above-mentioned condition, the absolute value of the half-aperture of the object-side surface S3 of the second lens L2 is too large, resulting in an excessively large edge area of ​​the object-side surface of the second lens L2. This makes it easy to generate more stray light, thereby increasing the risk of ghosting and also increasing the sensitivity of the second lens L2, which is not conducive to the engineering manufacturing of the second lens L2.

[0070] In some embodiments, the optical lens 100 satisfies the following relationship: 4.0 < |f6 / f| < 9, for example, |f6 / f| = 4.097, 5.017, 5.685, 6.158, 6.645, 7.150, 7.954, 8.285, 8.552, 8.648, 8.650, 8.657, or 8.896, etc.; where f6 is the focal length of the sixth lens L6. As mentioned above, the sixth lens L6 can provide negative or positive refractive power to the optical lens 100. By controlling the ratio of the focal length of the sixth lens L6 to the focal length of the optical lens 100, it is beneficial to correct the field curvature of the optical lens 100, improve the imaging resolution of the lens, and also to control the back focal length of the optical lens 100, thereby allowing as much light as possible to enter the imaging plane 101, and thus increasing the relative illumination of the optical lens 100. When the upper limit of the above relationship is exceeded, the absolute value of the focal length of the sixth lens L6 becomes larger, and the refractive power of the sixth lens L6 is too small, resulting in insufficient deflection angle of light. This makes it difficult to fully correct astigmatism, field curvature and distortion, and easily increases aberrations in the off-axis field of view. When the lower limit of the above condition is exceeded, the absolute value of the focal length of the optical lens 100 becomes too large, resulting in an excessively long optical length of the optical lens 100, which is not conducive to the miniaturization design of the optical lens 100.

[0071] In some embodiments, the optical lens 100 satisfies the following relationship: 11mm < |f3*f6 / f| < 27mm, for example, |f3*f6 / f| = 11.152, 11.156, 11.611, 11.772, 11.889, 13.110, 15.098, 17.320, 19.866, 21.065, 23.320, 25.394, 26.098, 26.132, 26.320, 26.750 or 26.899; where f3 is the focal length of the third lens L3 and f6 is the focal length of the sixth lens L6. As mentioned above, the third lens L3 can provide positive refractive power to the optical lens 100, and the sixth lens L6 can provide positive or negative refractive power to the optical lens 100. By reasonably controlling the ratio of the product of the focal lengths of the third lens L3 and the sixth lens L6 to the total focal length of the optical lens 100, it is beneficial to correct the field curvature and aberration of the optical lens 100 as a whole, so as to avoid the large field curvature and aberration of local lenses affecting the imaging quality of the optical lens 100, thereby ensuring the imaging resolution of the optical lens 100. When the refractive power provided by the third lens L3 is positive, the refractive power provided by the sixth lens L6 is negative. Therefore, the absolute value of the focal length of the sixth lens L6 is too large, and the refractive power of the sixth lens L6 is too small, resulting in insufficient deflection angle of the light and excessively long optical length of the optical lens 100, which is not conducive to the miniaturization design of the optical lens 100. When the refractive power provided by the third lens L3 and the sixth lens L6 is positive, the positive focal length provided by the third lens L3 and the sixth lens L6 together is too small, which easily leads to excessive overall refractive power of the optical lens 100, resulting in a large deflection angle of the light and thus easily increasing the aberrations in the off-axis field of view.

[0072] In some embodiments, the optical lens 100 satisfies the following relationship: 5.5 mm < TTL / FNO < 7 mm. For example, TTL / FNO = 5.988, 6.096, 6.254, 6.316, 6.447, 6.596, 6.597, 6.609, 6.611, 6.679, 6.778, or 6.981. Here, 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, that is, the total optical length of the optical lens 100, and FNO is the f-number of the optical lens 100. By reasonably controlling the ratio relationship between the total optical length of the optical lens 100 and the f-number of the optical lens 100, it is beneficial to meet the miniaturization design of the optical lens 100 and increase the light input of the optical lens 100, thereby improving the imaging resolution. When it is lower than the lower limit of the above relationship, the f-number of the optical lens 100 is too large, resulting in insufficient light transmission of the optical lens 100 and easily increasing the risk of vignetting. When it exceeds the upper limit of the above relationship, the total optical length of the optical lens 100 is too long, which is not conducive to the miniaturization design of the optical lens 100.

[0073] In some embodiments, the optical lens 100 satisfies the following relationship: 4.7 mm < (f / FNO) * 10 < 5.2 mm. For example, (f / FNO) * 10 = 4.703, 4.704, 4.708, 4.708, 4.709, 4.738, 4.768, 4.812, 4.902, 4.934, 4.978, 5.017, or 5.189, etc. Here, FNO is the f-number of the optical lens 100. By reasonably controlling the ratio relationship between the focal length of the optical lens 100 and the f-number, it is beneficial for the optical lens 100 to have a larger light entrance diameter, thereby facilitating an increase in the light input of the optical lens 100, and further improving the illuminance of the imaging surface 101 and the imaging resolution. When it is lower than the lower limit of the above relationship, the f-number of the optical lens 100 is too large, resulting in insufficient light transmission of the optical lens 100 and easily increasing the risk of vignetting. When it exceeds the upper limit of the above relationship, the focal length of the optical lens 100 is too long, which is not conducive to the effective deflection of light and the miniaturization design of the optical lens 100.

[0074] In some embodiments, the optical lens 100 satisfies the following relationship: 22.5 < TTL / (f / FNO) < 28.5. For example, TTL / (f / FNO) = 22.580, 22.980, 23.080, 24.180, 25.483, 26.110, 27.769, 28.295, 28.306, 28.355, 28.380, 28.388; or 28.479, 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, and FNO is the aperture number of the optical lens 100. By reasonably controlling the ratio relationship of the total optical length of the optical lens 100 to the focal length divided by the aperture number, it is beneficial to meet the miniaturization design of the optical lens 100. That is, the optical lens 100 can have a smaller aperture, a shorter total optical length, and at the same time, it can increase the light incident amount of the optical lens 100, which is beneficial to improving the imaging resolution of the imaging surface 101. In addition, when the above relationship is satisfied, the optical lens 100 can also have a compact and reasonable spatial layout, so that light can be deflected fully and reasonably, thereby correcting the field curvature, aberration, etc. of the optical lens 100 and improving the imaging quality. When below the lower limit of the above relationship, the light passing aperture of the optical lens 100 is too large, resulting in too much light passing amount of the optical lens 100, thus easily increasing the risk of image plane exposure; while when exceeding the upper limit of the above relationship, the total optical length of the optical lens 100 is too long, which is not conducive to the miniaturization design of the optical lens 100.

[0075] The following will specifically describe the optical lens 100 of this embodiment in combination with specific parameters.

[0076] First Embodiment

[0077] The structural schematic diagram of the optical lens 100 disclosed in the first embodiment of the present application is as Figure 1 shown. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7 arranged in sequence from the object side to the image side along the optical axis O. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a positive refractive power, and the sixth lens L6 has a negative refractive power. Regarding the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, reference can be made to the above specific embodiments, and details will not be elaborated here.

[0078] Furthermore, the object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 of the first lens L1 is concave near the optical axis; the object-side surface S3 of the second lens L2 is concave near the optical axis, and the image-side surface S4 of the second lens L2 is concave near the optical axis; the object-side surface S5 of the third lens L3 is convex near the optical axis, and the image-side surface S6 of the third lens L3 is concave near the optical axis; the object-side surface S7 of the fourth lens L4 is convex near the optical axis, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis; the object-side surface S9 of the fifth lens L5 is convex near the optical axis, and the image-side surface S10 of the fifth lens L5 is convex near the optical axis; the object-side surface S11 of the sixth lens L6 is concave near the optical axis, and the image-side surface S12 of the sixth lens L6 is convex near the optical axis.

[0079] Specifically, taking the focal length f = 0.951 mm, the maximum field of view FOV = 207 degrees, and the aperture number FNO = 2.02 of the optical lens 100 as examples, 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 sequentially according to the order of the elements in Table 1 from top to bottom. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The Y-radius in Table 1 is the radius of curvature of the object side or image side of the corresponding surface number near the optical axis O. The first value in the "thickness" parameter column of the lens is the thickness of the lens along the optical axis O, and the second value is the distance from the image side of the lens to the next surface along the optical axis O. The value of aperture 102 in the "Thickness" parameter column represents the distance from aperture 102 to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis O) on the optical axis O. By default, the direction from the object side of the first lens L1 to the image side of the last lens is the positive direction of the optical axis O. When this value is negative, it indicates that aperture 102 is located to the right of the vertex of the next surface. If the thickness of aperture 102 is positive, aperture 102 is to the left of the vertex of the next surface. It is understood that the units for Y-radius, thickness, and focal length in Table 1 are all mm. Furthermore, the reference wavelength for the focal length of each lens in Table 1 is 538.00 nm, and the reference wavelength for the refractive index and Abbe number of each lens is 587.60 nm.

[0080] Table 1

[0081]

[0082]

[0083] In the first embodiment, the object-side surface and image-side surface of any one of the second lens L2, the fourth lens L4 to the sixth lens L6 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0084]

[0085] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the 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 higher-order term of the aspherical surface. Table 2 gives the higher-order coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical mirror surface in the second lens L4, fourth lens L4 to sixth lens L6 that can be used in the first embodiment.

[0086] Table 2

[0087]

[0088]

[0089] Please see Figure 2 (A) in the middle Figure 2 Figure (A) shows the longitudinal spherical aberration curves of the optical lens 100 in the first embodiment at wavelengths of 408.00 nm, 473.00 nm, 538.00 mm, 600.00 mm, and 668.00 nm. Figure 2 In (A), the horizontal coordinate along the X-axis represents the focal point offset in mm, and the vertical coordinate along the Y-axis represents the normalized field of view. Figure 2 As can be seen from (A) in the first embodiment, the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0090] Please see Figure 2 (B) in the middle Figure 2 (B) in the figure is the astigmatism curve of the optical lens 100 in the first embodiment at a wavelength of 538.00 nm. Figure 2 In (B) of the diagram, the horizontal axis along the X-axis represents the focal point offset in mm, and the vertical axis along the Y-axis represents the field of view angle in degrees. In the astigmatism curve diagram, T represents the curvature of imaging plane 101 in the meridional direction, and S represents the curvature of imaging plane 101 in the sagittal direction. Figure 2 As can be seen from (B) in the figure, the astigmatism of the optical lens 100 is well compensated at the wavelength of 538.00nm.

[0091] Please see Figure 2 (C) in the middle, Figure 2 (C) in the figure is a distortion curve of the optical lens 100 in the first embodiment at a wavelength of 538.00 nm. The horizontal axis along the X-axis represents distortion in %, and the vertical axis along the Y-axis represents the field of view in degrees. Figure 2 As can be seen from (C), at this wavelength of 538.00nm, the distortion of the optical lens 100 is well corrected.

[0092] Second Embodiment

[0093] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of an optical lens 100 according to the second embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, arranged sequentially along the optical axis O from the object side to the image side. The materials of the first lens L1, the second lens L2, and the third lens L3 can be found in the specific embodiments described above, and will not be repeated here.

[0094] Furthermore, in the second embodiment, the refractive power and surface shape of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 can be found in the description of the surface shape of each lens in the first embodiment, and will not be repeated here.

[0095] In the second embodiment, the focal length of the optical lens 100 is f = 0.951 mm, the maximum field of view (FOV) of the optical lens 100 is 207.2 degrees, and the aperture number (FNO) of the optical lens 100 is 2.02, as an example. 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 foregoing embodiments, and will not be repeated here. It is understood that the units for Y-radius, thickness, and focal length in Table 3 are all mm. Furthermore, the reference wavelength for the focal length of each lens in Table 3 is 538.00 nm, and the reference wavelength for the refractive index and Abbe number of each lens is 587.60 nm.

[0096] Table 3

[0097]

[0098]

[0099] In the second embodiment, Table 4 provides the higher-order coefficients of each aspherical mirror surface that can be used in the second lens L2, the fourth lens L4 to the sixth lens L6 in the second embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0100] Table 4

[0101]

[0102] Please see Figure 4 , Figure 4 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens 100 of the second embodiment are shown. For specific definitions, please refer to the description in the first embodiment; they will not be repeated here. Figure 4 As can be seen from (A) in the diagram, 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. Figure 4 As can be seen from (B) in the diagram, the astigmatism of optical lens 100 is well compensated at a wavelength of 538.00 nm. (From...) Figure 4 As can be seen from (C), the distortion of the optical lens 100 is well corrected at a wavelength of 538.00 nm.

[0103] Third Embodiment

[0104] Please refer to Figure 5 , Figure 5 A schematic diagram of the structure of an optical lens 100 according to a third embodiment of this application is shown. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, arranged sequentially along the optical axis O from the object side to the image side. The materials of the first lens L1, the second lens L2, and the third lens L3 can be found in the specific embodiments described above, and will not be repeated here.

[0105] Furthermore, in the third embodiment, the refractive power and surface shape of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 can be found in the description of the surface shape of each lens in the first embodiment, and will not be repeated here.

[0106] In the third embodiment, the focal length of the optical lens 100 is f = 0.9512 mm, the maximum field of view (FOV) of the optical lens 100 is 207.2 degrees, and the aperture number (FNO) of the optical lens 100 is 2.02, as an example. Other parameters in this third embodiment are given in Table 5 below, and the definitions of each parameter can be derived from the foregoing description, and will not be repeated here. It is understood that the units for Y-radius, thickness, and focal length in Table 5 are all mm. Furthermore, the reference wavelength for the focal length of each lens in Table 5 is 538.00 nm, and the reference wavelength for the refractive index and Abbe number of each lens is 587.60 nm.

[0107] Table 5

[0108]

[0109] In the third embodiment, Table 6 provides the higher-order coefficients of each aspherical mirror surface that can be used in the second lens L2, the fourth lens L4 to the sixth lens L6 in the third embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0110] Table 6

[0111]

[0112]

[0113] Please see 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 specific definitions, please refer to the description in the first embodiment; they will not be repeated here. Figure 6 As can be seen from (A) in the figure, 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 the diagram, the astigmatism of optical lens 100 is well compensated at a wavelength of 538.00 nm. (From...) Figure 6 As can be seen from (C), the distortion of the optical lens 100 is well corrected at a wavelength of 538.00 nm.

[0114] Fourth embodiment

[0115] Please see Figure 7 This is a schematic diagram of the structure of the optical lens 100 disclosed in the fourth embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, arranged sequentially along the optical axis O from the object side to the image side. The materials of the first lens L1, the second lens L2, and the third lens L3 can be found in the specific embodiments described above, and will not be repeated here.

[0116] Furthermore, in the fourth embodiment, the refractive power and surface shape of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 can be found in the description of the surface shape of each lens in the first embodiment, and will not be repeated here.

[0117] In the fourth embodiment, the focal length of the optical lens 100 is f = 0.9502 mm, the maximum field of view (FOV) of the optical lens 100 is 210 degrees, and the aperture number (FNO) of the optical lens 100 is 2.02, as an example. Other parameters in this fourth embodiment are given in Table 7 below, and the definitions of each parameter can be derived from the foregoing description, and will not be repeated here. It is understood that the units for Y-radius, thickness, and focal length in Table 7 are all mm. Furthermore, the reference wavelength for the focal length of each lens in Table 7 is 538.00 nm, and the reference wavelength for the refractive index and Abbe number of each lens is 587.60 nm.

[0118] Table 7

[0119]

[0120]

[0121] In the fourth embodiment, Table 8 provides the higher-order coefficients of each aspherical mirror surface that can be used in the second lens L2, the fourth lens L4 to the sixth lens L6 in the fourth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0122] Table 8

[0123]

[0124] Please see 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 specific definitions, please refer to the description in the first embodiment; they will not be repeated here. Figure 8 As can be seen from (A) in the diagram, 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 the diagram, the astigmatism of optical lens 100 is well compensated at a wavelength of 538.00 nm. (From...) Figure 8 As can be seen from (C), the distortion of the optical lens 100 is well corrected at a wavelength of 538.00 nm.

[0125] Fifth embodiment

[0126] Please see Figure 9This is a schematic diagram of the structure of the optical lens 100 disclosed in the fifth embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, arranged sequentially along the optical axis O from the object side to the image side. The materials of the first lens L1, the second lens L2, and the third lens L3 can be found in the specific embodiments described above, and will not be repeated here.

[0127] Furthermore, in the fifth embodiment, the refractive power and surface shape of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 can be found in the description of the surface shape of each lens in the first embodiment, and will not be repeated here.

[0128] In the fifth embodiment, the focal length of the optical lens 100 is f = 0.9500 mm, the maximum field of view (FOV) of the optical lens 100 is 213.4 degrees, and the aperture number (FNO) of the optical lens 100 is 2.02, as an example. Other parameters in this fifth embodiment are given in Table 9 below, and the definitions of each parameter can be derived from the foregoing description, and will not be repeated here. It is understood that the units for Y-radius, thickness, and focal length in Table 9 are all mm. Furthermore, the reference wavelength for the focal length of each lens in Table 9 is 538.00 nm, and the reference wavelength for the refractive index and Abbe number of each lens is 587.60 nm.

[0129] Table 9

[0130]

[0131] In the fifth embodiment, Table 10 provides the higher-order coefficients of each aspherical mirror surface in the second lens L2, the fourth lens L4 to the sixth lens L6 that can be used in the fifth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0132] Table 10

[0133]

[0134]

[0135] Please see Figure 10 , Figure 10 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens 100 of the fifth embodiment are shown. For specific definitions, please refer to the description in the first embodiment; they will not be repeated here. Figure 10 As can be seen from (A) in the figure, 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. Figure 10As can be seen from (B) in the diagram, the astigmatism of optical lens 100 is well compensated at a wavelength of 538.00 nm. (From...) Figure 10 As can be seen from (C), the distortion of the optical lens 100 is well corrected at a wavelength of 538.00 nm.

[0136] Sixth Embodiment

[0137] Please see Figure 11 This is a schematic diagram of the structure of the optical lens 100 disclosed in the sixth embodiment of this application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, arranged sequentially along the optical axis O from the object side to the image side. The materials of the first lens L1, the second lens L2, and the third lens L3 can be found in the specific embodiments described above, and will not be repeated here.

[0138] Furthermore, in the sixth embodiment, the refractive power of each lens differs from the surface shape of each lens in the first embodiment in that: the sixth lens L6 has positive refractive power; the surface shape of each lens differs from the surface shape of each lens in the first embodiment in that: the object side S3 of the second lens L2 is convex near the optical axis, the image side S6 of the third lens L3 is convex near the optical axis, and the object side S12 of the sixth lens L6 is convex near the optical axis.

[0139] In the sixth embodiment, the focal length of the optical lens 100 is f = 1.0377 mm, the maximum field of view (FOV) of the optical lens 100 is 207 degrees, and the aperture number (FNO) of the optical lens 100 is 2.00, as an example. Other parameters in this sixth embodiment are given in Table 11 below, and the definitions of each parameter can be derived from the foregoing description, and will not be repeated here. It is understood that the units for Y-radius, thickness, and focal length in Table 11 are all mm. Furthermore, the reference wavelength for the focal length of each lens in Table 11 is 538.00 nm, and the reference wavelength for the refractive index and Abbe number of each lens is 587.60 nm.

[0140] Table 11

[0141]

[0142] In the sixth embodiment, Table 12 provides the higher-order coefficients of each aspherical mirror surface that can be used in the second lens L2, the fourth lens L4 to the sixth lens L6 in the sixth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0143] Table 12

[0144]

[0145]

[0146] Please see Figure 12 , Figure 12 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens 100 of the sixth embodiment are shown. For specific definitions, please refer to the description in the first embodiment; they will not be repeated here. Figure 12 As can be seen from (A) in the figure, 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 12 As can be seen from (B) in the diagram, the astigmatism of optical lens 100 is well compensated at a wavelength of 538.00 nm. (From...) Figure 12 As can be seen from (C), the distortion of the optical lens 100 is well corrected at a wavelength of 538.00 nm.

[0147] Please refer to Table 13, which summarizes the ratios of the relationships in the first to sixth embodiments of this application.

[0148] Table 13

[0149]

[0150] Please see Figure 13 This application also discloses a camera module 200, which includes a photosensitive chip 201 and an optical lens 100 as described in any of the first to sixth embodiments above. The photosensitive chip 201 is disposed on the image side of the optical lens 100. The optical lens 100 can be used to receive the light signal of the subject and project it onto the photosensitive chip 201, and the photosensitive chip 201 can be used to convert the light signal corresponding to the subject into an image signal. Further details are omitted here. It is understood that the camera module 200 with the optical lens 100 can achieve a miniaturized design of the optical lens 100 while also possessing a wide field of view shooting effect. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they will not be repeated here.

[0151] This application also discloses a smart terminal, which may be, but is not limited to, a mobile phone, tablet computer, laptop computer, smartwatch, monitor, or car. The smart terminal includes a terminal body and a camera module as described above, the camera module being disposed on the terminal body to acquire image information. It is understood that the smart terminal with the aforementioned camera module also possesses all the technical effects of the aforementioned optical lens. That is, the smart terminal can achieve a miniaturized optical lens design while also providing a wide field of view shooting effect. Since the aforementioned technical effects have been described in detail in the embodiments of the optical lens, they will not be repeated here.

[0152] An example, such as Figure 14 As shown, the Figure 14 A schematic diagram of a smartphone is shown, comprising a housing 301 (the aforementioned main body) and a camera module 200 as described above. The camera module 200 is mounted on the housing 301 to acquire image information. It is understood that a smartphone with the aforementioned camera module 200 has a higher ability to capture details of the subject, providing users with a better shooting experience. Another example is... Figure 15 As shown, the Figure 15 The diagram illustrates the structure of a car as a smart terminal. The car 400 includes a vehicle body 401 (the aforementioned terminal body) and a camera module 200 as described above. The camera module 200 is mounted on the vehicle body 401 to acquire image information. It is understood that the car 400 equipped with the aforementioned camera module facilitates the acquisition of environmental information around the vehicle body 401, while also enabling wide-angle shooting and clear imaging, providing better driving warnings for the driver.

[0153] The foregoing has provided a detailed description of an optical lens, camera module, and terminal device disclosed in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the optical lens, camera module, and terminal device of the present invention and their core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An optical lens, characterized in that, The optical lens has six refractive lenses, which are arranged sequentially from the object side to the image side along the optical axis as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens. The first lens has negative refractive power, the object side of the first lens is convex near the optical axis, and the image side of the first lens is concave near the optical axis. The second lens has negative refractive power. Both the object-side surface and the image-side surface of the second lens are aspherical, and the image-side surface of the second lens is concave near the optical axis. The third lens has positive refractive power, and the object side of the third lens is convex near the optical axis; The fourth lens has negative refractive power. Both the object-side surface and the image-side surface of the fourth lens are aspherical. 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 fifth lens has positive refractive power. Both the object-side surface and the image-side surface of the fifth lens are aspherical. The object-side surface of the fifth lens is convex near the optical axis, and the image-side surface of the fifth lens is convex near the optical axis. The sixth lens has refractive power, and both the object-side surface and the image-side surface of the sixth lens are aspherical. The image-side surface of the sixth lens is convex near the optical axis. The optical lens satisfies the following relationship: 199deg / mm <FOV / f<223deg / mm; Wherein, FOV is the maximum field of view of the optical lens, and f is the focal length of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 2.73 < ∑CT / CT3 < 4.5; and / or, 1.05 <CT3 / (CT4+CT5)<1.25; Wherein, ∑CT is the sum of the thicknesses of each of the first to sixth lenses along the optical axis, CT3 is the thickness of the third lens along the optical axis, CT4 is the thickness of the fourth lens along the optical axis, and CT5 is the thickness of the fifth lens along the optical axis.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 14 <FOV / CRA<18; Where CRA is the principal ray incident angle of the edge field of view.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 2.6 <Rs6 / SAGs6<19.5; Wherein, Rs6 is the radius of curvature of the image-side surface of the sixth lens on the optical axis, and SAGs6 is the sag of the image-side surface of the sixth lens at the maximum effective radius.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 2.5 < |f3 / f| < 3.5, 4.0 < |f6 / f| < 9; and / or, 11mm < |f3*f6 / f| < 27mm; Where f3 is the focal length of the third lens and f6 is the focal length of the sixth lens.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 7 < (ET2 / ET1) * 100 < 36.5; Among them, ET1 is the distance in the optical axis direction from the maximum effective semi-aperture of the object side of the first lens to the maximum effective semi-aperture of the image side of the first lens, and ET2 is the distance in the optical axis direction from the maximum effective semi-aperture of the object side of the second lens to the maximum effective semi-aperture of the image side of the second lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relational expressions: 11 < |SD21 / SAGs21| < 14; Among them, SD21 is the maximum effective semi-aperture of the object side of the second lens, and SAGs21 is the sagittal height of the object side of the second lens at the maximum effective radius.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relational expressions: 5.5 mm < TTL / FNO < 7 mm, 4.7 mm < (f / FNO) * 10 < 5.2 mm; and / or, 22.5 < TTL / (f / FNO) < 28.5; Among them, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens, and FNO is the aperture number of the optical lens.

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

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

Images