Optical lens, camera module and terminal equipment

Abstract

The invention discloses an optical lens, a camera module and terminal equipment, and the optical lens comprises three lenses with refractive power, and comprises a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side along an optical axis. The first lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The second lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The third lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof. The optical lens satisfies the following relational expressions: 100 default; a FOVlt; 120 deg, 1 lt; iMGH / Flt; and 1.2. According to the optical lens, the camera module and the terminal equipment, miniaturization design of the optical lens can be realized, and meanwhile, the optical lens has the characteristic of a large field angle.

Description

Technical Field

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

[0002] In recent years, with the continuous development of imaging technology, optical lenses have gradually developed towards a trend of miniaturized design. Taking industrial endoscopes as an example, they are mainly used to detect and observe the internal structure of objects and can be widely used in aviation, automobiles, ships, electrical, chemical and other fields. Due to the needs of endoscope application scenarios, there are usually strict requirements on the size of the camera it carries, as well as a sufficiently large field of view and good imaging effects.

[0003] However, the industrial endoscopes currently on the market cannot achieve both a miniaturized design and a large field of view. Summary of the invention

[0004] The embodiments of the present application disclose an optical lens, a camera module and a terminal device, which can realize a miniaturized design of the optical lens while enabling the optical lens to have a large field of view.

[0005] In order to achieve the above-mentioned object, in a first aspect, the present application discloses an optical lens, which has three lenses with refractive power, including a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side along the optical axis;

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

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

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

[0009] The optical lens satisfies the following relationship:

[0010] 100deg <FOV<120deg、1<IMGH / F<1.2;

[0011] Wherein, FOV is the maximum field of view of the optical lens, IMGH is half of the image height corresponding to the maximum field of view of the optical lens, and F is the focal length of the optical lens.

[0012] In the optical lens provided by this application, the first lens is set to have a negative refractive power, which can effectively couple the light of a large field of view into the optical lens, increase the entry of marginal rays into the optical lens, and improve the relative illuminance at the edge. With its image side being concave at the optical axis, more light can further enter the optical lens. The second lens is set to have a positive refractive power. With its object side being convex at the optical axis and its image side being concave at the optical axis, the refractive power of the overall optical lens can be shifted towards the object side, which is beneficial for slowing down the entry of light into the optical lens, making the light more gentle, and improving the yield of the optical lens. The third lens is set to have a positive refractive power. With its image side being convex at the optical axis, it is beneficial for increasing the image height and ensuring the image height of the optical lens while ensuring that the size of the optical lens is small enough.

[0013] The optical lens satisfies the relationship 100deg < FOV < 120deg. By reasonably setting the maximum field of view angle of the optical lens, sufficient field of view angle can be provided for the optical lens, enabling the light of a larger field of view to enter the optical lens to meet the large field of view angle characteristics of the optical lens.

[0014] The optical lens satisfies the relationship 1 < IMGH / F < 1.2. By reasonably configuring the ratio of the semi-image height of the optical lens to the focal length of the optical lens, it is beneficial for the optical lens to meet the imaging requirements of high definition and at the same time beneficial for the optical lens to capture images within a relatively large field of view. When the optical lens exceeds the upper limit of the above relationship, the semi-image height of the optical lens is too high, which is not conducive to the imaging clarity and affects the imaging effect; when the optical lens is lower than the lower limit of the above relationship, the focal length of the optical lens is too long, which is not conducive to the wide-angleization of the optical lens and it is difficult to capture large-field scenes.

[0015] As an optional implementation manner, in the embodiment of the first aspect of this application, the optical lens satisfies the following relationships:

[0016] 2 < TTL / F < 2.6, and / or, 1.9 < TTL / IMGH < 2.2, and / or, 20deg < FOV / FNO < 26deg;

[0017] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis (i.e., the total length of the optical lens), and FNO is the aperture number of the optical lens.

[0018] The optical lens satisfies the relationship 2 < TTL / F < 2.6. By controlling the relationship between the total length of the optical lens and the focal length of the optical lens, the optical lens can balance the focal length of the optical lens while meeting the requirements of miniaturized design. Exceeding the upper limit of the above relationship, the total length of the optical lens is too long, which is not conducive to realizing the miniaturized design of the optical lens. Below the lower limit of the above relationship, the effective focal length of the optical lens is too long, which is not conducive to expanding the field of view angle of the optical system, and the optical lens cannot obtain sufficient object space information.

[0019] The optical lens satisfies the relationship 1.9 < TTL / IMGH < 2.2. Controlling the relationship between the total length of the optical lens and half of the image height corresponding to the maximum field of view angle of the optical lens can facilitate the realization of the miniaturized design of the optical lens. At the same time, IMGH determines the size of the electronic photosensitive chip. Meeting the above relationship can enable the optical lens to support high-pixel electronic photosensitive chips, and thus the optical lens has high pixels and can meet the imaging quality requirements of the optical lens.

[0020] The optical lens satisfies the relationship 20deg < FOV / FNO < 26deg. By reasonably controlling the relationship between the maximum field of view angle and the aperture number of the optical lens, a reasonable field of view angle and aperture number are provided for the optical lens, and the requirements of design difficulty and field of view angle can be taken into account.

[0021] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0022] 1 < F3 / F2 < 2.5, and / or, 3 < |R5 / R4| < 10, and / or, 1.2 < SD5 / SD4 < 2.5;

[0023] Wherein, F2 is the focal length of the second lens, F3 is the focal length of the third lens, R4 is the curvature radius of the image side surface of the second lens on the optical axis, R5 is the curvature radius of the object side surface of the third lens on the optical axis, SD4 is half of the maximum effective aperture of the image side surface of the second lens, and SD5 is half of the maximum effective aperture of the object side surface of the third lens.

[0024] The optical lens satisfies the relationship 1 < F3 / F2 < 2.5. By reasonably defining the ratio of the focal lengths of the third lens and the second lens, the refractive powers of the second lens and the third lens can be reasonably distributed to facilitate the correction of aberrations.

[0025] The optical lens satisfies the relationship 3 < |R5 / R4| < 10. By keeping R4 and R5 satisfying the above relationship, it is beneficial for the light to be more gentle from before the diaphragm to after the diaphragm, reducing the sensitivity of the optical lens and improving the assembly yield.

[0026] The optical lens satisfies the relationship 1.2 < SD5 / SD4 < 2.5. Satisfying this relationship can effectively converge the light rays of the second lens, enabling the light rays to enter the third lens better and ultimately enter the imaging plane of the optical lens.

[0027] As an alternative implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0028] 3.9 < TTL / SD1 < 4.5, and / or, 1.8 < IMGH / SD6 < 2.3;

[0029] Wherein, SD1 is half of the maximum effective aperture of the object side of the first lens, SD6 is half of the maximum effective aperture of the image side of the third lens, and TTL is the distance from the object side of the first lens to the imaging plane of the optical lens on the optical axis.

[0030] The optical lens satisfies the relationship 3.9 < TTL / SD1 < 4.5. By controlling the ratio of the two within a reasonable range, while meeting the miniaturization of the optical lens, it can also meet the requirement that the semi-image height of the optical lens is greater than 1.028 mm.

[0031] The optical lens satisfies the relationship 1.8 < IMGH / SD6 < 2.3. By controlling the ratio of the semi-image height of the optical lens to the semi-aperture of the image side of the third lens, the image height of the optical lens can be effectively controlled, meeting the requirements of high pixels and good image quality of the optical lens.

[0032] As an alternative implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0033] 0.8 < (CT1 + CT2 + CT3) / F < 1.1, and / or, 0.9 < (F1 + F2 + F3) / F < 1.2;

[0034] Wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, F1 is the focal length of the first lens, F2 is the focal length of the second lens, and F3 is the focal length of the third lens.

[0035] The optical lens satisfies the relationship 0.8 < (CT1 + CT2 + CT3) / F < 1.1. By controlling the appropriate relationship between CT1, CT2, CT3, and F, a reasonable relationship between the focal length and the overall optical length of the optical lens can be obtained, effectively controlling the overall optical length of the optical lens.

[0036] The optical lens satisfies the relationship 0.9 < (F1 + F2 + F3) / F < 1.2. Ensuring that the ratio of the above parameters is within a reasonable range can reasonably control the focal length of the entire optical lens and ensure that the optical lens can have clear imaging within the range of 8 mm to 150 mm.

[0037] As an alternative implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0038] -1.2 < R6 / F3 < -0.5, and / or, 1.4 < CT3 / ET3 < 2.2, and / or, 1.3 < SD6 / CT3 < 1.6;

[0039] Wherein, R6 is the curvature radius of the image side of the third lens on the optical axis, F3 is the focal length of the third lens, CT3 is the thickness of the third lens on the optical axis, ET3 is the distance in the optical axis direction from the maximum effective aperture of the object side of the third lens to the maximum effective aperture of the image side of the third lens (i.e., the edge thickness of the third lens), and SD6 is half of the maximum effective aperture of the image side of the third lens.

[0040] The optical lens satisfies the relationship -1.2 < R6 / F3 < -0.5. Ensuring that the two are within the above range can effectively control the incident angle of the principal ray of the maximum image height of the optical lens on the image plane to be greater than 30°.

[0041] The optical lens satisfies the relationship 1.4 < CT3 / ET3 < 2.2. By controlling the relationship between the central thickness and the edge thickness of the third lens, the thickness ratio of the third lens can be reasonably controlled, thereby optimizing the surface shape of the third lens, facilitating the effective convergence of large-angle incident light, and making the light passing through the third lens have a smaller deflection angle, thereby reducing the generation of stray light and ensuring good imaging performance.

[0042] The optical lens satisfies the relationship 1.3 < SD6 / CT3 < 1.6. By controlling the ratio relationship between the maximum effective semi-aperture of the image side of the third lens and the central thickness, the large-angle exit of the light passing through the third lens can be effectively controlled, increasing the effective light transmission aperture, facilitating the increase of the image plane, and thus achieving a large image plane effect. When the optical lens exceeds the upper limit of the above relationship, the maximum effective semi-aperture of the image side of the third lens is too large, which is not conducive to controlling the width of the third lens perpendicular to the optical axis direction and increases the risk of ghost images; when the optical lens is lower than the lower limit of the above relationship, the central thickness of the third lens increases, which is not conducive to the structural compactness of the optical lens.

[0043] As an alternative implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0044] |R1 / R2| < 45, and / or, 3 < R4 / R3 < 4, and / or, 0.8 < (R5 - R6) / (R5 + R6) < 2;

[0045] Wherein, R1 is the curvature radius of the object side of the first lens on the optical axis, R2 is the curvature radius of the image side of the second lens on the optical axis, R3 is the curvature radius of the object side of the second lens on the optical axis, R4 is the curvature radius of the image side of the second lens on the optical axis, R5 is the curvature radius of the object side of the third lens on the optical axis, and R6 is the curvature radius of the image side of the third lens on the optical axis.

[0046] The optical lens satisfies the relation |R1 / R2| < 45. By reasonably matching the ratio between the curvature radii of the object side and the image side of the first lens on the optical axis, it is beneficial to control the shape of the first lens, ensure that the lens has good processability and mass production ability, and can meet the relative illumination of the optical lens being greater than 50%.

[0047] The optical lens satisfies the relation 3 < R4 / R3 < 4. By reasonably matching the ratio between the curvature radii of the object side and the image side of the second lens on the optical axis, it is beneficial to control the shape of the second lens, ensure that the lens has good processability and mass production ability.

[0048] The optical lens satisfies the relation 0.8 < (R5 - R6) / (R5 + R6) < 2. Satisfying this relation can make the surface shape difference between the object side and the image side of the third lens be set reasonably, reasonably control the shape of the third lens, be beneficial to reducing the sensitivity of the third lens to eccentricity, and thus effectively correct aberrations.

[0049] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relations:

[0050] VD1 - VD2 > 22, and / or, 1.8 < F2 / CT2 < 3, and / or, 2 < F3 / CT3 < 4;

[0051] Wherein, VD1 is the Abbe number of the first lens, VD2 is the Abbe number of the second lens, F2 is the focal length of the second lens, CT2 is the thickness of the second lens on the optical axis, F3 is the focal length of the third lens, and CT3 is the thickness of the third lens on the optical axis.

[0052] The optical lens satisfies the relation VD1 - VD2 > 22. By controlling the Abbe numbers of the first lens and the second lens within the above relations, the chromatic aberration of the optical lens can be effectively corrected, and the optical performance of the optical lens can be effectively improved.

[0053] The optical lens satisfies the relationship 1.8 < F2 / CT2 < 3. By satisfying this relationship, the tolerance sensitivity of the central thickness of the second lens can be reduced, the processing difficulty of a single lens can be decreased, which is beneficial to improving the assembly yield of the optical lens and further reducing the production cost. By satisfying the relationship 1.8 < F2 / CT2 < 3, it is possible to avoid an excessive focal length of the second lens and prevent the optical lens from generating astigmatism that is difficult to correct, thereby reducing the imaging quality of the optical lens. At the same time, it is possible to avoid the central thickness of the second lens being too large or too small. The larger the central thickness of the second lens, the greater its weight, which is not conducive to the lightweight characteristics of the optical lens. If the central thickness of the second lens is too small, the processing difficulty of the second lens will be relatively high.

[0054] The optical lens satisfies the relationship 2 < F3 / CT3 < 4, which can reasonably configure the refractive power of the third lens, effectively control the deflection angle of light rays in the optical lens, and then reduce the sensitivity of the optical lens and improve the resolution of the optical lens.

[0055] In a second aspect, the present application also discloses an imaging module, which includes an image sensor and the optical lens as described in the first aspect above. The image sensor is disposed on the image side of the optical lens.

[0056] In a third aspect, the present application also discloses a terminal device, which includes a housing and the imaging module as described in the second aspect above. The imaging module is disposed in the housing.

[0057] Compared with the prior art, the beneficial effects of the present application are as follows:

[0058] In the optical lens provided by the present application, the first lens is set to have a negative refractive power, which can effectively couple light rays in a large field of view into the optical lens, increase the entry of marginal light rays into the optical lens, and improve the relative illuminance at the edge. With its image side being concave at the optical axis, more light rays can further enter the optical lens. The second lens is set to have a positive refractive power, and with its object side being convex at the optical axis and its image side being concave at the optical axis, the refractive power of the overall optical lens can be shifted towards the object side, which is beneficial to slowing down the entry of light rays into the optical lens, making the light rays more gentle, and improving the yield of the optical lens. The third lens is set to have a positive refractive power, and with its image side being convex at the optical axis, it is beneficial to increase the image height and ensure the image height of the optical lens while ensuring that the size of the optical lens is small enough.

[0059] The optical lens satisfies the relationship 100deg < FOV < 120deg. By reasonably setting the maximum field of view angle of the optical lens, a sufficient field of view angle can be provided for the optical lens, enabling light rays in a larger field of view to enter the optical lens to meet the large field of view angle characteristics of the optical lens.

[0060] The optical lens satisfies the relation 1 < IMGH / F < 1.2. By reasonably configuring the ratio of the semi-image height of the optical lens to the focal length of the optical lens, it is beneficial for the optical lens to meet the imaging requirements of high definition, and at the same time, it is beneficial to realize the shooting of the optical lens within a large field of view. When the optical lens exceeds the upper limit of the above relation, the semi-image height of the optical lens is too high, which is not conducive to the clarity of imaging and affects the imaging effect; when the optical lens is lower than the lower limit of the above relation, the focal length of the optical lens is too long, which is not conducive to the wide-angleization of the optical lens and it is difficult to shoot a large field of view scene. Brief Description of the Drawings

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0062] Figure 1 It is a schematic structural diagram of the optical lens disclosed in Embodiment 1 of the present application;

[0063] Figure 2 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Embodiment 1 of the present application;

[0064] Figure 3 It is a schematic structural diagram of the optical lens disclosed in Embodiment 2 of the present application;

[0065] Figure 4 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Embodiment 2 of the present application;

[0066] Figure 5 It is a schematic structural diagram of the optical lens disclosed in Embodiment 3 of the present application;

[0067] Figure 6 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Embodiment 3 of the present application;

[0068] Figure 7 It is a schematic structural diagram of the optical lens disclosed in Embodiment 4 of the present application;

[0069] Figure 8 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Embodiment 4 of the present application;

[0070] Fig. 9 It is a schematic structural diagram of the optical lens disclosed in Embodiment 5 of the present application;

[0071] Fig.10 is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 5 of the present application;

[0072] Fig.11 It is a structural schematic diagram of the camera module disclosed in this application;

[0073] Fig.12 It is a structural schematic diagram when the terminal device disclosed in the present application is an industrial endoscope. DETAILED DESCRIPTION

[0074] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0075] In this application, the terms "upper", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0076] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0077] In addition, the terms "disposed", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0079] The technical solution of the present application will be further described below in conjunction with embodiments and drawings.

[0080] See also Figure 1 In the optical lens 100 of the present application, it includes a first lens L1, a second lens L2, and a third lens L3 which are sequentially arranged along the optical axis from the object side to the image side, and finally an image is formed on the imaging surface 101 of the optical lens 100.

[0081] The first lens L1 has negative refractive power, the second lens L2 has positive refractive power, and the third lens L3 has positive refractive power.

[0082] In the embodiments of the present application, the object-side surface 1 of the first lens L1 is a convex surface or a concave surface at the near optical axis, and the image-side surface 2 of the first lens L1 is a concave surface at the near optical axis; the object-side surface 3 of the second lens L2 is a convex surface at the near optical axis, and the image-side surface 4 of the second lens L2 is a concave surface at the near optical axis; the object-side surface 5 of the third lens L3 is a convex surface or a concave surface at the near optical axis, and the image-side surface 6 of the third lens L3 is a convex surface at the near optical axis.

[0083] In the optical lens 100 provided by the present application, the first lens L1 is set to have a negative refractive power, which can effectively couple light of a large field of view into the optical lens 100, increase the edge light entering the optical lens 100, and improve the relative illumination of the edge. In conjunction with the image side surface being a concave surface at the optical axis, more light can be further allowed to enter the optical lens 100. The second lens L2 is set to have a positive refractive power, and in conjunction with the object side surface being a convex surface at the optical axis and the image side surface being a concave surface at the optical axis, the refractive power of the entire optical lens 100 can be moved toward the object side, which is conducive to slowing down the light entering the optical lens 100, making the light smoother, and improving the yield of the optical lens 100. The third lens L3 is set to have a positive refractive power, and in conjunction with the image side surface being a convex surface at the optical axis, it is conducive to improving the image height, and the image height of the optical lens 100 is guaranteed while ensuring that the size of the optical lens 100 is small enough.

[0084] Optionally, all lenses in the optical lens 100 may be made of glass, or may be made of plastic, or some lenses may be made of glass and some lenses may be made of plastic. Preferably, the first lens L1, the second lens L2 and the third lens L3 may all be made of glass. Lenses made of glass can suppress the deviation of the back focus of the optical lens 100 due to temperature changes, so as to improve the stability of the optical lens 100. At the same time, lenses made of glass are less sensitive to temperature, which can avoid blurring of the optical lens 100 caused by high and low temperature changes in the use environment, and can make the optical lens 100 have better optical performance.

[0085] Optionally, the first lens L1, the second lens L2, and the third lens L3 may be aspherical lenses. From the center of the lens to the periphery of the lens, the curvature of the aspherical lens changes continuously. Compared with a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better imaging characteristics and has the advantages of improving aberrations such as distortion and astigmatism.

[0086] In some embodiments, the optical lens 100 may further include a diaphragm 102. The diaphragm 102 may be an aperture stop and / or a field stop, and may be disposed between the image side 4 of the second lens L2 and the object side 5 of the third lens L3 of the optical lens 100. Of course, in other embodiments, the diaphragm 102 may also be disposed between other lenses, and the setting is adjusted according to actual situations, and no specific limitation is made in this embodiment.

[0087] In some embodiments, the optical lens 100 may further include a front protective glass 110, and the front protective glass 110 is disposed on the object side 1 of the first lens L1.

[0088] In some embodiments, the optical lens 100 may further include a protective glass 120, and the protective glass 120 is disposed between the third lens L3 and the imaging surface 101, and can be close to the image sensor during subsequent assembly, thereby playing a protective role.

[0089] In some embodiments, the optical lens 100 satisfies the relationship 100deg < FOV < 120deg, where FOV is the maximum field of view angle of the optical lens 100. By reasonably setting the maximum field of view angle of the optical lens 100, a sufficient field of view angle can be provided for the optical lens 100, so that light with a larger field of view enters the optical lens 100 to meet the characteristics of the large field of view angle of the optical lens 100.

[0090] In some embodiments, the optical lens 100 satisfies the relationship 4 < FNO < 5, where FNO is the f-number of the optical lens 100. By limiting the f-number of the optical lens 100, the characteristics of the optical lens 100 having a large aperture can be satisfied, the light input can be increased, the clarity of imaging can be improved, and it also has good shooting quality in low-light environments.

[0091] In some embodiments, the optical lens 100 satisfies the relationship 20deg < FOV / FNO < 26deg, where FOV is the maximum field of view angle of the optical lens 100 and FNO is the f-number of the optical lens 100. By reasonably controlling the relationship between the maximum field of view angle and the f-number of the optical lens 100, a reasonable field of view angle and f-number are provided for the optical lens 100, and the design difficulty and the requirement of the field of view angle can be taken into account.

[0092] In some embodiments, the optical lens 100 satisfies the relationship 1 < IMGH / F < 1.2, where IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens 100, and F is the focal length of the optical lens 100. By reasonably configuring the ratio of the half image height of the optical lens 100 to the focal length of the optical lens 100, it is beneficial for the optical lens 100 to meet the imaging requirements of high definition, and at the same time, it is beneficial to realize the shooting of the optical lens 100 within a large field of view range. When the optical lens 100 exceeds the upper limit of the above relationship, the half image height of the optical lens 100 is too high, which is not conducive to the clarity of imaging and affects the imaging effect; when the optical lens 100 is lower than the lower limit of the above relationship, the focal length of the optical lens 100 is too long, which is not conducive to the wide-angleization of the optical lens 100 and it is difficult to shoot a large field of view scene.

[0093] In some embodiments, the optical lens 100 satisfies the relationship 2 < TTL / F < 2.6, where TTL is the distance from the object side surface 1 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis, and F is the focal length of the optical lens 100. By controlling the relationship between the total length of the optical lens 100 and the focal length of the optical lens 100, the optical lens 100 can balance the focal length of the optical lens 100 while meeting the requirements of miniaturized design. Exceeding the upper limit of the above relationship, the total length of the optical lens 100 is too long, which is not conducive to realizing the miniaturized design of the optical lens 100. Lower than the lower limit of the above relationship, the effective focal length of the optical lens 100 is too long, which is not conducive to expanding the field of view angle of the optical system and makes the optical lens 100 unable to obtain sufficient object space information. More preferably, the optical lens 100 satisfies the relationship 2.2 < TTL / F < 2.5, which is more beneficial to the miniaturization of the optical lens 100.

[0094] In some embodiments, the optical lens 100 satisfies the relationship 1.9 < TTL / IMGH < 2.2, where TTL is the distance from the object side surface 1 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis, and IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens 100. Controlling the relationship between the total length of the optical lens 100 and half of the image height corresponding to the maximum field of view angle of the optical lens 100 can be beneficial to realizing the miniaturized design of the optical lens 100. At the same time, IMGH determines the size of the electronic photosensitive chip. Meeting the above relationship can enable the optical lens 100 to support a high-pixel electronic photosensitive chip, and further enable the optical lens 100 to have high pixels and meet the imaging quality requirements of the optical lens 100.

[0095] In some embodiments, the optical lens 100 satisfies the relation 1 < F3 / F2 < 2.5, where F2 is the focal length of the second lens L2 and F3 is the focal length of the third lens L3. By reasonably limiting the ratio of the focal lengths of the third lens L3 and the second lens L2, the refractive powers of the second lens L2 and the third lens L3 can be reasonably distributed to facilitate aberration correction.

[0096] In some embodiments, the optical lens 100 satisfies the relation 3 < |R5 / R4| < 10, where R4 is the radius of curvature of the image side 4 of the second lens L2 on the optical axis and R5 is the radius of curvature of the object side 5 of the third lens L3 on the optical axis. By maintaining the above relationship between R4 and R5, it is beneficial for the light to be smoother from before the aperture 102 to after the aperture 102, reducing the sensitivity of the optical lens 100 and improving the assembly yield.

[0097] In some embodiments, the optical lens 100 satisfies the relation 1.2 < SD5 / SD4 < 2.5, where SD4 is half of the maximum effective aperture of the image side 4 of the second lens L2 and SD5 is half of the maximum effective aperture of the object side 5 of the third lens L3. Satisfying this relation can effectively converge the light rays of the second lens L2, enabling the light rays to enter the third lens L3 better and ultimately enter the imaging surface of the optical lens 100.

[0098] In some embodiments, the optical lens 100 satisfies the relation 3.9 < TTL / SD1 < 4.5, where TTL is the distance from the object side 1 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis, and SD1 is half of the maximum effective aperture of the object side 1 of the first lens L1. By controlling the ratio between the two within a reasonable range, while meeting the miniaturization of the optical lens 100, the requirement that the semi-image height of the optical lens 100 is greater than 1.028 mm can also be satisfied.

[0099] In some embodiments, the optical lens 100 satisfies the relation 1.8 < IMGH / SD6 < 2.3, where IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens 100, and SD6 is half of the maximum effective aperture of the image side 6 of the third lens L3. By controlling the ratio of the semi-image height of the optical lens 100 and the semi-aperture of the image side 6 of the third lens L3, the image height of the optical lens 100 can be effectively controlled to meet the requirements of high pixels and good image quality of the optical lens 100.

[0100] In some embodiments, the optical lens 100 satisfies the relation 0.8 < (CT1 + CT2 + CT3) / F < 1.1, where CT1 is the thickness of the first lens L1 on the optical axis, CT2 is the thickness of the second lens L2 on the optical axis, CT3 is the thickness of the third lens L3 on the optical axis, and F is the focal length of the optical lens 100. By controlling the appropriate relationship among CT1, CT2, CT3, and F, a reasonable relationship between the focal length and the overall optical length of the optical lens 100 can be obtained, effectively controlling the overall optical length of the optical lens 100.

[0101] In some embodiments, the optical lens 100 satisfies the relation 0.9 < (F1 + F2 + F3) / F < 1.2, where F1 is the focal length of the first lens L1, F2 is the focal length of the second lens L2, F3 is the focal length of the third lens L3, and F is the focal length of the optical lens 100. By ensuring that the ratio of the above parameters is within a reasonable range, the focal length of the entire optical lens 100 can be reasonably controlled, ensuring that the optical lens 100 can have clear imaging within the range of 8 mm - 150 mm.

[0102] In some embodiments, the optical lens 100 satisfies the relation -1.2 < R6 / F3 < -0.5, where R6 is the radius of curvature of the image side 6 of the third lens L3 at the optical axis, and F3 is the focal length of the third lens L3. By ensuring that the two are within the above range, the maximum image height of the optical lens 100 can be effectively controlled such that the incident angle of the chief ray on the image plane is greater than 30°.

[0103] In some embodiments, the optical lens 100 satisfies the relation 1.4 < CT3 / ET3 < 2.2, where CT3 is the thickness of the third lens L3 on the optical axis, and ET3 is the distance along the optical axis from the maximum effective aperture of the object side 5 to the maximum effective aperture of the image side 6 of the third lens L3. By controlling the relationship between the central thickness and the edge thickness of the third lens L3, the thickness ratio of the third lens L3 can be reasonably controlled, thereby optimizing the surface shape of the third lens L3, facilitating the effective convergence of large-angle incident light, and ensuring that the light passing through the third lens L3 has a small deflection angle, reducing the generation of stray light, and ensuring good imaging performance.

[0104] In some embodiments, the optical lens 100 satisfies the relation 1.3 < SD6 / CT3 < 1.6, where SD6 is half of the maximum effective aperture of the image side 6 of the third lens L3, and CT3 is the thickness of the third lens L3 on the optical axis. By controlling the ratio of the maximum effective semi-aperture of the image side 6 of the third lens L3 to the central thickness, the large-angle emergence of light passing through the third lens L3 can be effectively controlled, increasing the effective light transmission aperture, facilitating the increase of the image plane, and thus achieving the effect of a large image plane. When the optical lens 100 exceeds the upper limit of the above relation, the maximum effective semi-aperture of the image side 6 of the third lens L3 is too large, which is not conducive to controlling the width of the third lens L3 perpendicular to the optical axis direction and increases the risk of ghost images; when the optical lens 100 is lower than the lower limit of the above relation, the central thickness of the third lens L3 increases, which is not conducive to the structural compactness of the optical lens 100.

[0105] In some embodiments, the optical lens 100 satisfies the relation |R1 / R2| < 45, where R1 is the curvature radius of the object side 1 of the first lens L1 on the optical axis, and R2 is the curvature radius of the image side 4 of the second lens L2 on the optical axis. By reasonably matching the ratio between the curvature radii of the object side 1 and the image side 2 of the first lens L1 on the optical axis, it is beneficial to control the shape of the first lens L1, ensure that the lens has good processability and mass production performance, and can satisfy that the relative illumination of the optical lens 100 is greater than 50%.

[0106] In some embodiments, the optical lens 100 satisfies the relation 3 < R4 / R3 < 4, where R3 is the curvature radius of the object side 3 of the second lens L2 on the optical axis, and R4 is the curvature radius of the image side 4 of the second lens L2 on the optical axis. By reasonably matching the ratio between the curvature radii of the object side 3 and the image side 4 of the second lens L2 on the optical axis, it is beneficial to control the shape of the second lens L2, ensure that the lens has good processability and mass production performance.

[0107] In some embodiments, the optical lens 100 satisfies the relation 0.5 < (R1 - R2) / (R1 + R2) < 1.2, where R1 is the curvature radius of the object side 1 of the first lens L1 on the optical axis, and R2 is the curvature radius of the image side 2 of the second lens L2 on the optical axis. Satisfying the above relation is beneficial to controlling the shape of the first lens L1, correcting the aberration generated by itself, and improving the imaging quality.

[0108] In some embodiments, the optical lens 100 satisfies the relation -0.6 < (R3 - R4) / (R3 + R4) < -0.4, where R3 is the curvature radius of the object side 3 of the second lens L2 on the optical axis, and R4 is the curvature radius of the image side 4 of the second lens L2 on the optical axis. Satisfying the above relation is beneficial to controlling the shape of the second lens L2, correcting the aberration generated by itself, and improving the imaging quality.

[0109] In some embodiments, the optical lens 100 satisfies the relational expression 0.8 < (R5 - R6) / (R5 + R6) < 2, where R5 is the radius of curvature of the object side 5 of the third lens L3 at the optical axis, and R6 is the radius of curvature of the image side 6 of the third lens L3 at the optical axis. By satisfying this relational expression, the surface type difference between the object side 5 and the image side 6 of the third lens can be reasonably set, and the shape of the third lens L3 can be reasonably controlled, which is beneficial to reducing the sensitivity of the decentration of the third lens L3, thereby effectively correcting aberrations.

[0110] In some embodiments, the optical lens 100 satisfies the relational expression VD1 - VD2 > 22, where VD1 is the Abbe number of the first lens L1, and VD2 is the Abbe number of the second lens L2. By controlling the Abbe numbers of the first lens L1 and the second lens L2 within the above relationship, the chromatic aberration of the optical lens 100 can be effectively corrected, and the optical performance of the optical lens 100 can be effectively improved. More preferably, the optical lens 100 satisfies the relational expression 22 < VD1 - VD2 < 40, which can make the optical performance of the optical lens 100 better.

[0111] In some embodiments, the optical lens 100 satisfies the relational expression -4 < F1 / CT1 < -2, where F1 is the focal length of the first lens L1, and CT2 is the thickness of the second lens L2 on the optical axis. By reasonably controlling the ratio relationship between the focal length of the first lens L1 and the thickness of the first lens L1, it is beneficial to reasonably configure the refractive power of the first lens L1, effectively control the angle of light entering the first lens L1, and thus is beneficial to correcting aberrations.

[0112] In some embodiments, the optical lens 100 satisfies the relational expression 1.8 < F2 / CT2 < 3, where F2 is the focal length of the second lens L2, and CT2 is the thickness of the second lens L2 on the optical axis. By satisfying this relational expression, the tolerance sensitivity of the central thickness of the second lens L2 can be reduced, the processing difficulty of a single lens can be reduced, which is beneficial to improving the assembly yield of the optical lens 100, and further reducing the production cost. By satisfying the relational expression 1.8 < F2 / CT2 < 3, it is possible to avoid the focal length of the second lens L2 being too large and avoid the astigmatism that is difficult to correct in the optical lens 100, thereby reducing the imaging quality of the optical lens 100; at the same time, avoid the central thickness of the second lens L2 being too large or too small. The larger the central thickness of the second lens L2, the greater the weight of the second lens L2, which is not conducive to the lightweight characteristics of the optical lens 100. The smaller the central thickness of the second lens L2, the greater the processing difficulty of the second lens L2.

[0113] In some embodiments, the optical lens 100 satisfies the relation 2 < F3 / CT3 < 4, where F3 is the focal length of the third lens L3, and CT3 is the thickness of the third lens L3 on the optical axis. The refractive power of the third lens L3 can be reasonably configured, effectively controlling the deflection angle of the light rays in the optical lens 100, thereby reducing the sensitivity of the optical lens 100 and improving the resolution of the optical lens 100.

[0114] In some embodiments, the optical lens 100 satisfies the relation -1 < F1 / F < -0.5, where F1 is the focal length of the first lens L1, and F is the focal length of the optical lens 100. By reasonably defining the focal length of the first lens L1 and the focal length of the optical lens 100, the light rays incident on the optical lens 100 at a large angle can be captured, expanding the field of view angle range of the optical lens 100. When the optical lens 100 exceeds the upper limit of the above relation, the refractive power of the first lens L1 is too strong, and the imaging on the image plane will be sensitive to the change of the first lens L1, resulting in a large aberration; when the optical lens 100 is below the lower limit of the above relation, the refractive power of the first lens L1 is insufficient, which is not conducive to the entry of light rays at a large angle into the optical lens 100.

[0115] In some embodiments, the optical lens 100 satisfies the relation 0.5 < F2 / F < 1, where F2 is the focal length of the second lens L2, and F is the focal length of the optical lens 100. By reasonably defining the focal length of the second lens L2 and the focal length of the optical lens 100, it is beneficial to broaden the light rays refracted by the first lens L1 at a large angle and fully transmit them to the imaging plane, which is beneficial to realizing the high pixel characteristics of the optical lens 100.

[0116] In some embodiments, the optical lens 100 satisfies the relation 0.9 < F3 / F < 1.3, where F3 is the focal length of the third lens L3, and F is the focal length of the optical lens 100. By reasonably defining the focal length of the third lens L3 and the focal length of the optical lens 100, it is beneficial to correct the marginal aberration and improve the imaging resolution.

[0117] The optical lens 100 of this embodiment will be described in detail below in combination with specific parameters.

[0118] Embodiment 1

[0119] Figure 1This is a schematic diagram of the structure of an optical lens 100 disclosed in Example 1 of the present application. The optical lens 100 includes a front protective glass 110, a first lens L1, a second lens L2, an aperture 102, a third lens L3 and a protective glass 120, which are arranged in sequence from the object side to the image side along the optical axis. Among them, the object side surface 1 of the first lens L1 is a concave surface at the near optical axis, and the image side surface 2 of the first lens L1 is a concave surface at the near optical axis; the object side surface 3 of the second lens L2 is a convex surface at the near optical axis, and the image side surface 4 of the second lens L2 is a concave surface at the near optical axis; the object side surface 5 of the third lens L3 is a convex surface at the near optical axis, and the image side surface 6 of the third lens L3 is a convex surface at the near optical axis.

[0120] Specifically, taking the focal length F=0.973mm of the optical lens 100, the aperture number FNO=4.5 of the optical lens 100, and the maximum field of view FOV=103deg of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 1. Among them, the elements along the optical axis of the optical lens 100 from the object side to the image side are arranged in the order of the elements from top to bottom in Table 1. In the same lens, the surface with a smaller surface number is the object side of the lens, and the surface with a larger surface number is the image side of the lens, such as surface numbers 1 and 2 correspond to the object side surface 1 and image side surface 2 of the first lens L1, respectively. The Y radius in Table 1 is the radius of curvature of the object side surface or image side surface of the corresponding surface number at the optical axis. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side surface of the lens to the next surface on the optical axis. The value of the aperture 102 in the "Thickness" parameter column is the distance from the aperture 102 to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis) on the optical axis. 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. When the value is negative, it indicates that the aperture 102 is set on the image side of the next surface vertex. If the thickness of the aperture 102 is a positive value, the aperture 102 is on the object side of the next surface vertex. It can be understood that the units of the Y radius, thickness, and focal length in Table 1 are all mm. And the refractive index, Abbe number, focal length, etc. in Table 1 are all obtained at a reference wavelength of 555nm.

[0121] Table 1

[0122]

[0123]

[0124] In Example 1, the object-side surface and the image-side surface of the first lens L1, the second lens L2, and the third lens L3 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0125]

[0126] Among them, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the curvature of the aspheric surface at the optical axis, c=1 / Y (that is, the paraxial curvature c is the reciprocal of the curvature radius Y in Table 1 above); K is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 2 gives the high-order coefficients A4, A6, A8, A10, and A12 of the aspheric surfaces of the first lens L1, the second lens L2, and the third lens L3.

[0127] Table 2

[0128]

[0129] Figure 2 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 1 of the present application. Figure 2 (A) is a spherical aberration diagram of the optical lens 100 at wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm. The horizontal axis along the X-axis direction represents the focus offset in mm, and the vertical axis along the Y-axis direction represents the normalized field of view. Figure 2 As can be seen from (A) in the figure, the spherical aberration value of the optical lens 100 in Example 1 is better, which means that the imaging quality of the optical lens 100 in this embodiment is better.

[0130] Figure 2 (B) is the astigmatism diagram of the optical lens 100 in Example 1 at a wavelength of 555 nm. The horizontal axis along the X-axis direction represents the focus offset in mm, and the vertical axis along the Y-axis direction represents the field angle in degrees. T in the astigmatism diagram represents the curvature of the imaging surface 101 in the meridian direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. Figure 2 As can be seen from (B) in the figure, at this wavelength, the field curvature of the optical lens 100 is small, the field curvature and astigmatism of each field of view are well corrected, and the center and edge of the field of view have clear images, that is, the astigmatism of the optical lens 100 is well compensated.

[0131] Figure 2 (C) is a distortion diagram of the optical lens 100 in Example 1 at a wavelength of 555 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view angle, in degrees. Figure 2 As can be seen from (C) in FIG. 1 , at this wavelength, the image deformation caused by the main light beam is small, and the distortion of the optical lens 100 is well corrected.

[0132] Example 2

[0133] Figure 3This is a schematic diagram of the structure of the optical lens 100 disclosed in Example 2 of the present application. Specifically, taking the focal length F=0.971mm of the optical lens 100, the aperture number FNO=4.5 of the optical lens 100, and the maximum field angle FOV=115deg of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 3. The definition of each parameter can be derived from the description of the aforementioned embodiment and will not be repeated here. The refractive index, Abbe number, focal length, etc. in Table 3 are all obtained at a reference wavelength of 555nm. In addition, regarding the refractive power of each lens and the corresponding relationship between each face number and the object side and image side of each lens, please refer to the aforementioned Example 1, which will not be repeated here.

[0134] Table 3

[0135]

[0136] Table 4 gives the high-order coefficients of the aspheric surfaces of the first lens L1, the second lens L2, and the third lens L3 that can be used in Example 2, wherein the surface shape of each aspheric surface can be defined by the formula given in Example 1.

[0137] Table 4

[0138]

[0139]

[0140] See also Figure 4 ,Depend on Figure 4 As can be seen from the spherical aberration diagram (A), the astigmatism diagram (B), and the distortion diagram (C), the spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 4 (A) Figure 4 (B) and Figure 4 The wavelengths corresponding to the curves in (C) can be referred to in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The contents described in (C) will not be repeated here.

[0141] Example 3

[0142] Figure 5This is a schematic diagram of the structure of an optical lens 100 disclosed in Example 3 of the present application. The optical lens 100 includes a front protective glass 110, a first lens L1, a second lens L2, an aperture 102, a third lens L3 and a protective glass 120, which are arranged in sequence from the object side to the image side along the optical axis. Among them, the object side surface 1 of the first lens L1 is a convex surface at the near optical axis, and the image side surface 2 of the first lens L1 is a concave surface at the near optical axis; the object side surface 3 of the second lens L2 is a convex surface at the near optical axis, and the image side surface 4 of the second lens L2 is a concave surface at the near optical axis; the object side surface 5 of the third lens L3 is a convex surface at the near optical axis, and the image side surface 6 of the third lens L3 is a convex surface at the near optical axis.

[0143] Specifically, taking the focal length F of the optical lens 100 = 0.972 mm, the aperture number FNO of the optical lens 100 = 4.5, and the maximum field angle FOV of the optical lens 100 = 113.6 degrees as an example, other parameters of the optical lens 100 are given in the following Table 5. The definition of each parameter can be obtained from the description of the aforementioned embodiment, and will not be repeated here. The refractive index, Abbe number, focal length, etc. in Table 5 are all obtained at a reference wavelength of 555 nm.

[0144] Table 5

[0145]

[0146] Table 6 gives the high-order coefficients of the aspheric surfaces of the first lens L1, the second lens L2, and the third lens L3 that can be used in Example 3, wherein the surface shape of each aspheric surface can be defined by the formula given in Example 1.

[0147] Table 6

[0148]

[0149] See also Figure 6 ,Depend on Figure 6 As can be seen from the spherical aberration diagram (A), the astigmatism diagram (B), and the distortion diagram (C), the spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 6 (A) Figure 6 (B) and Figure 6 The wavelengths corresponding to the curves in (C) can be referred to in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The contents described in (C) will not be repeated here.

[0150] Example 4

[0151] Figure 7This is a schematic diagram of the structure of the optical lens 100 disclosed in Example 4 of the present application. Specifically, taking the focal length F=0.969mm of the optical lens 100, the aperture number FNO=4.5 of the optical lens 100, and the maximum field angle FOV=112deg of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 7. The definition of each parameter can be derived from the description of the aforementioned embodiment and will not be repeated here. The refractive index, Abbe number, focal length, etc. in Table 7 are all obtained at a reference wavelength of 555nm. In addition, regarding the refractive power of each lens and the corresponding relationship between each face number and the object side and image side of each lens, please refer to the aforementioned Example 3, which will not be repeated here.

[0152] Table 7

[0153]

[0154] Table 8 gives the high-order coefficients of the aspheric mirror surfaces of the first lens L1, the second lens L2, and the third lens L3 that can be used in Example 4, wherein the surface shape of each aspheric surface can be defined by the formula given in Example 1.

[0155] Table 8

[0156]

[0157] See also Figure 8 8, it can be seen from the spherical aberration diagram (A), the astigmatism diagram (B) and the distortion diagram (C) that the spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 8 (A) Figure 8 (B) and Figure 8 The wavelengths corresponding to the curves in (C) can be referred to in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The contents described in (C) will not be repeated here.

[0158] Example 5

[0159] Fig. 9This is a schematic diagram of the structure of an optical lens 100 disclosed in Example 5 of the present application. The optical lens 100 includes a front protective glass 110, a first lens L1, a second lens L2, an aperture 102, a third lens L3 and a protective glass 120, which are arranged in sequence from the object side to the image side along the optical axis. Among them, the object side surface 1 of the first lens L1 is a convex surface at the near optical axis, and the image side surface 2 of the first lens L1 is a concave surface at the near optical axis; the object side surface 3 of the second lens L2 is a convex surface at the near optical axis, and the image side surface 4 of the second lens L2 is a concave surface at the near optical axis; the object side surface 5 of the third lens L3 is a concave surface at the near optical axis, and the image side surface 6 of the third lens L3 is a convex surface at the near optical axis.

[0160] Specifically, taking the focal length F of the optical lens 100 = 0.972 mm, the aperture number FNO of the optical lens 100 = 4.5, and the maximum field angle FOV of the optical lens 100 = 113 degrees as an example, other parameters of the optical lens 100 are given in the following Table 9. The definition of each parameter can be obtained from the description of the aforementioned embodiment, and will not be repeated here. The refractive index, Abbe number, focal length, etc. in Table 9 are all obtained at a reference wavelength of 555 nm.

[0161] Table 9

[0162]

[0163]

[0164] Table 10 gives the high-order coefficients of the aspheric mirror surfaces of the first lens L1, the second lens L2, and the third lens L3 that can be used in Example 5, wherein the surface shape of each aspheric surface can be defined by the formula given in Example 1.

[0165] Table 10

[0166]

[0167] See also Fig.10 , it can be seen from the spherical aberration diagram (A), the astigmatism diagram (B) and the distortion diagram (C) in 10 that the spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Fig.10 (A) Fig.10 (B) and Fig.10 The wavelengths corresponding to the curves in (C) can be referred to in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The contents described in (C) will not be repeated here.

[0168] Please refer to Table 11, which is a summary of the ratios of the various relationship equations in Examples 1 to 5 of the present application.

[0169] Table 11

[0170]

[0171]

[0172] See also Fig.11 The present application also discloses a camera module 200, which includes an image sensor 201 and an optical lens 100 as described in any one of the above embodiments 1 to 5, wherein the image sensor 201 is disposed on the image side of the optical lens 100. Specifically, the photosensitive surface of the image sensor 201 is located on the imaging surface 101 of the optical lens 100, and the light of the object incident on the photosensitive surface through the lens can be converted into an electrical signal of the image. The image sensor 201 can be a complementary metal oxide semiconductor (CMOS) or a charge-coupled device (CCD).

[0173] The camera module 200 may be an imaging module integrated in the terminal device 300, or may be an independent lens. It is understood that the camera module 200 having the above optical lens 100 has all the technical effects of the above optical lens 100, that is, the camera module 200 can realize the miniaturization design of the optical lens while making the optical lens 100 have the characteristics of a large field of view. Since the above technical effects have been described in detail in the embodiment of the optical lens 100, they will not be repeated here.

[0174] The present application also discloses a terminal device 300, which includes a housing 301 and the camera module 200, wherein the camera module 200 is disposed in the housing 301. The terminal device 300 may include but is not limited to a medical endoscope, an industrial endoscope, and the like.

[0175] See also Fig.12 , taking the terminal device 300 as an industrial endoscope as an example, the housing 301 can be a mirror tube, and the camera module 200 can be arranged at the end of the mirror tube, and driven by the mirror tube to extend into the object to be detected to obtain the image information inside the object. For example, check the equipment such as oil refining equipment and storage tanks to find defects such as corrosion, scaling, cracks, etc. in time; or check the corrosion, blockage or leakage inside the pipeline.

[0176] It can be understood that the terminal device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the terminal device 300 can realize the miniaturization design of the optical lens while making the optical lens 100 have the characteristics of a large field of view. Since the above technical effects have been described in detail in the embodiment of the optical lens 100, they will not be repeated here.

[0177] The optical lens, camera module and terminal device disclosed in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the optical lens, camera module and terminal device of the present application and its core idea; at the same time, for general technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An optical lens, characterized in that: There are three lenses with refractive power in total, including a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side along the optical axis; The first lens has negative refractive power, and the image side surface of the first lens is concave near the optical axis; The second lens has positive refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is concave near the optical axis; The third lens has positive refractive power, and the image side surface of the third lens is convex near the optical axis; The optical lens satisfies the following relational expressions: 100deg < FOV < 120deg, 1 < IMGH / F < 1.2; Wherein, FOV is the maximum field of view angle of the optical lens, IMGH is half of the image height corresponding to the maximum field of view angle 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 relational expressions: 2 < TTL / F < 2.6, and / or, 1.9 < TTL / IMGH < 2.2, and / or, 20deg < FOV / FNO < 26deg; Wherein, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens, and FNO is the aperture number of the optical lens.

3. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: 1 < F3 / F2 < 2.5, and / or, 3 < |R5 / R4| < 10, and / or, 1.2 < SD5 / SD4 < 2.5; Wherein, F2 is the focal length of the second lens, F3 is the focal length of the third lens, R4 is the curvature radius of the image side surface of the second lens at the optical axis, R5 is the curvature radius of the object side surface of the third lens at the optical axis, SD4 is half of the maximum effective aperture of the image side surface of the second lens, and SD5 is half of the maximum effective aperture of the object side surface of the third lens.

4. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: 3.9 < TTL / SD1 < 4.5, and / or, 1.8 < IMGH / SD6 < 2.3; Wherein, SD1 is half of the maximum effective aperture of the object side surface of the first lens, SD6 is half of the maximum effective aperture of the image side surface of the third lens, and TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens.

5. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: 0.8 < (CT1 + CT2 + CT3) / F < 1.1, and / or, 0.9 < (F1 + F2 + F3) / F < 1.2; Wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, F1 is the focal length of the first lens, F2 is the focal length of the second lens, and F3 is the focal length of the third lens.

6. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: -1.2 < R6 / F3 < -0.5, and / or, 1.4 < CT3 / ET3 < 2.2, and / or, 1.3 < SD6 / CT3 < 1.6; Wherein, R6 is the radius of curvature of the image side of the third lens at the optical axis, F3 is the focal length of the third lens, CT3 is the thickness of the third lens on the optical axis, ET3 is the distance in the optical axis direction from the maximum effective aperture of the object side of the third lens to the maximum effective aperture of the image side of the third lens, and SD6 is half of the maximum effective aperture of the image side of the third lens.

7. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: |R1 / R2| < 45, and / or, 3 < R4 / R3 < 4, and / or, 0.8 < (R5 - R6) / (R5 + R6) < 2; Wherein, R1 is the radius of curvature of the object side of the first lens at the optical axis, R2 is the radius of curvature of the image side of the second lens at the optical axis, R3 is the radius of curvature of the object side of the second lens at the optical axis, R4 is the radius of curvature of the image side of the second lens at the optical axis, R5 is the radius of curvature of the object side of the third lens at the optical axis, and R6 is the radius of curvature of the image side of the third lens at the optical axis.

8. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: VD1 - VD2 > 22, and / or, 1.8 < F2 / CT2 < 3, and / or, 2 < F3 / CT3 < 4; Wherein, VD1 is the Abbe number of the first lens, VD2 is the Abbe number of the second lens, F2 is the focal length of the second lens, CT2 is the thickness of the second lens on the optical axis, F3 is the focal length of the third lens, and CT3 is the thickness of the third lens on the optical axis.

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

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

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