Optical lens

Abstract

The application discloses an optical lens, which comprises, along an optical axis from an object side to an image plane, a first lens with positive refractive power, the object side of which is a convex surface, and the image side of which is a concave surface near the optical axis; a second lens with negative refractive power, the object side of which is a convex surface, and the image side of which is a concave surface; a third lens with positive refractive power, the object side of which is a concave surface, and the image side of which is a convex surface; a fourth lens with negative refractive power, the object side of which is a concave surface near the optical axis, and the image side of which is a concave surface near the optical axis and has at least one inflection point; and a diaphragm arranged between the second lens and the third lens; wherein the total optical length TTL of the optical lens is less than 3.2 mm. The optical lens has the advantages of small head size, small volume, high imaging quality, etc.

Description

Technical Field

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

[0002] Currently, with the widespread use of portable electronic devices (such as smartphones, tablets, and cameras), coupled with the popularity of social media, video, and live streaming software, people's love for photography is growing. Camera lenses have become a standard feature of electronic devices, and they have even become a primary consideration for consumers when purchasing electronic devices.

[0003] With the continuous development of mobile information technology, portable electronic devices such as mobile phones are also moving towards ultra-thinness, full-screen displays, and ultra-high-definition imaging. This places higher demands on the camera lenses mounted on portable electronic devices, requiring them to have sufficient optical performance and imaging capabilities while maintaining a small size, and to keep pace with the evolution of electronic devices while improving optical performance. In recent years, the continuous development of irregular screens such as waterdrop screens, notch screens, and punch-hole screens stems from consumers' enthusiastic pursuit of full-screen mobile phones. However, the presence of the front-facing camera and the large size of the bezel still present many obstacles to achieving a full-screen display. Moreover, due to the large outer diameter of the bezel and the overall size, it is difficult to increase the screen-to-body ratio, thus failing to provide consumers with a better visual experience. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide an optical lens that has the advantages of small head size, small volume, and high imaging quality, and can better meet the high screen ratio requirements of portable electronic devices.

[0005] The embodiments of the present invention achieve the above-mentioned objectives through the following technical solutions.

[0006] This invention provides an optical lens, comprising, along the optical axis from the object side to the imaging plane, the following components in sequence:

[0007] A first lens with positive optical power, wherein the object side of the first lens is convex and the image side of the first lens is concave near the optical axis;

[0008] A second lens with negative optical power, wherein the object side of the second lens is convex and the image side of the second lens is concave;

[0009] A third lens with positive optical power, wherein the object-side surface of the third lens is concave and the image-side surface of the third lens is convex;

[0010] A fourth lens having negative optical power, wherein the object-side surface of the fourth lens is concave near the optical axis, and the image-side surface of the fourth lens is concave near the optical axis and has at least one inflection point; and

[0011] An aperture stop is disposed between the second lens and the third lens;

[0012] The total optical length (TTL) of the optical lens is less than 3.2 mm.

[0013] Compared to existing technologies, the optical lens provided by this invention employs four lenses with specific refractive forces, and places the aperture stop behind the second lens, which helps to reduce the size of the lens head while increasing its depth. Through specific surface shape combinations and reasonable power distribution, a more compact structure is achieved while meeting high pixel requirements, and the outer diameter of the lens head can be reduced to a certain extent. The following features can meet the requirements of a high screen-to-body ratio, thus achieving a good balance between small lens size and high pixel count, and better meeting the high screen-to-body ratio requirements of portable electronic products. Attached Figure Description

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0015] Figure 1 This is a schematic diagram of the structure of the optical lens according to the first embodiment of the present invention;

[0016] Figure 2 This is a field curvature curve diagram of the optical lens according to the first embodiment of the present invention;

[0017] Figure 3 This is an f-tanθ distortion curve of the optical lens according to the first embodiment of the present invention;

[0018] Figure 4 This is a chromatic aberration curve of the optical lens according to the first embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the structure of the optical lens according to the second embodiment of the present invention;

[0020] Figure 6 This is a field curvature curve diagram of the optical lens according to the second embodiment of the present invention;

[0021] Figure 7 This is an f-tanθ distortion curve of the optical lens according to the second embodiment of the present invention;

[0022] Figure 8 This is a chromatic aberration curve of the optical lens according to the second embodiment of the present invention;

[0023] Figure 9 This is a schematic diagram of the optical lens structure according to the third embodiment of the present invention;

[0024] Figure 10This is a field curvature curve diagram of the optical lens according to the third embodiment of the present invention;

[0025] Figure 11 This is an f-tanθ distortion curve of the optical lens according to the third embodiment of the present invention;

[0026] Figure 12 This is a chromatic aberration curve of the optical lens according to the third embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Throughout this specification, the same reference numerals refer to the same elements.

[0029] The present invention proposes an optical lens, which includes, in sequence along the optical axis from the object side to the imaging plane: a first lens, a second lens, an aperture stop, a third lens, a fourth lens, and a filter.

[0030] The first lens has positive optical power, the object side of the first lens is convex, and the image side of the first lens is concave near the optical axis.

[0031] The second lens has negative optical power, the object side of the second lens is convex, and the image side of the second lens is concave.

[0032] The third lens has positive optical power, the object side of the third lens is concave, and the image side of the third lens is convex.

[0033] The fourth lens has negative optical power. The object side of the fourth lens is concave near the optical axis, and the image side of the fourth lens is concave near the optical axis and has at least one inflection point.

[0034] An aperture stop is positioned between the second lens and the third lens.

[0035] The total optical length (TTL) of the optical lens is less than 3.2 mm.

[0036] The optical lens of this invention uses a combination of four lenses with specific refractive power, and the aperture stop is placed behind the second lens, which helps to reduce the head size of the optical lens while increasing the head depth. Through specific surface shape matching and reasonable optical power distribution, the optical lens has the advantages of small head size, small volume and high imaging quality.

[0037] In some embodiments, the optical lens satisfies the following condition:

[0038] 1.65 <TTL / IH<2.0;(1)

[0039] Wherein, TTL represents the total optical length of the optical lens, and IH represents the image height corresponding to the maximum half field of view of the optical lens. Satisfying the above condition (1) can effectively reduce the total length of the lens, thereby achieving the ultra-thin and miniaturized characteristics of the lens, and thus enabling the lens to better meet the high screen ratio requirements of portable electronic products.

[0040] In some embodiments, the optical lens satisfies the following condition:

[0041] -0.1 <f / f2<0;(2)

[0042] 1 <R21 / R22<3;(3)

[0043] Where f2 represents the focal length of the second lens, f represents the effective focal length of the optical lens, R21 represents the radius of curvature of the object side of the second lens, and R22 represents the radius of curvature of the image side of the second lens. By satisfying conditions (2) and (3), the focal length ratio and shape of the second lens can be reasonably controlled, enabling it to bear a specific negative optical power, which is beneficial to improving the resolving power of the optical lens and at the same time better realizing the small head size of the lens.

[0044] In some embodiments, the optical lens satisfies the following condition:

[0045] -0.13 <f1 / f2<0;(4)

[0046] Where f1 represents the focal length of the first lens and f2 represents the focal length of the second lens. Satisfying the above condition (4) can prevent excessive refraction of light entering the lens, reduce the sensitivity of the optical system, effectively increase the depth of the lens head, thereby reducing the obstruction of incident light by the screen thickness, and also facilitates a smaller lens head size (the outer diameter of the head can be made smaller). (The following) allows for a better realization of a small lens size.

[0047] In some embodiments, the optical lens satisfies the following condition:

[0048] 1.5 <CT1 / CT2<3.5;(5)

[0049] 11 <CT1 / CT12<25;(6)

[0050] Wherein, CT1 represents the thickness of the first lens on the optical axis, CT2 represents the thickness of the second lens on the optical axis, and CT12 represents the air gap distance between the first lens and the second lens on the optical axis. Satisfying the above conditions (5) and (6) is beneficial to reducing the head size of the lens, thereby reducing the window size on the screen, increasing the screen ratio, and better meeting the needs of full-screen mobile phones.

[0051] In some embodiments, the optical lens satisfies the following condition:

[0052] -0.05 <f3 / f2<0;(7)

[0053] Where f2 represents the focal length of the second lens and f3 represents the focal length of the third lens. The lenses before and after the aperture stop play an important role in correcting distortion. By satisfying the above condition (7), the third positive lens has a strong converging and deflecting ability, which can be balanced with the second negative lens to correct system aberrations and improve imaging quality.

[0054] In some embodiments, the optical lens satisfies the following condition:

[0055] 5 <R31 / R32<30;(8)

[0056] Wherein, R31 represents the radius of curvature of the object side of the third lens, and R32 represents the radius of curvature of the image side of the third lens. Satisfying condition (8) enables the third lens to have a better converging effect on light, which can better correct the aberrations caused by the front lens, while reducing the overall length of the system and facilitating miniaturization.

[0057] In some embodiments, the optical lens satisfies the following condition:

[0058] -50 <R41 / R42<-5;(9)

[0059] -20 <R41 / f<-1;(10)

[0060] Wherein, R41 represents the radius of curvature of the object side of the fourth lens, R42 represents the radius of curvature of the image side of the fourth lens, and f represents the effective focal length of the optical lens. By satisfying the above conditions (9) and (10), the shape of the fourth lens can be adjusted to adjust the aberration of the peripheral light rays, which is beneficial to improving the imaging quality of the optical lens.

[0061] In some embodiments, the optical lens satisfies the following condition:

[0062] DM2 / DMi < 0.8, i = 1, 3 or 4; (11)

[0063] Wherein, DM1 represents the effective aperture of the first lens, DM2 represents the effective aperture of the second lens, DM3 represents the effective aperture of the third lens, DM4 represents the effective aperture of the fourth lens, and DMi represents the effective aperture of the i-th lens. Satisfying the above condition (11) allows the second lens to have the smallest aperture among all lenses, effectively controlling the total optical length of the lens, while also effectively reducing the degree of light refraction, better controlling aberrations in each field of view, and improving the image quality of the lens.

[0064] In some embodiments, the optical lens satisfies the following condition:

[0065] 0.05 <CT23 / TTL<0.18;(12)

[0066] Wherein, CT23 represents the air gap between the second lens and the third lens on the optical axis, and TTL represents the total optical length of the optical lens. By satisfying the above condition (12) and reasonably allocating the air gap between the second lens and the third lens on the optical axis, the light deflection between the second lens and the third lens can be slowed down, effectively reducing system sensitivity and improving manufacturing yield.

[0067] In some embodiments, the optical lens satisfies the following condition:

[0068] 1.0 <DM11 / DM32<1.3;(13)

[0069] 0.3 <ALEC13 / TTL<0.4;(14)

[0070] Wherein, DM11 represents the effective aperture of the object-side surface of the first lens, DM32 represents the effective aperture of the image-side surface of the third lens, and ALEC13 represents the distance from the edge of the object-side surface of the first lens to the edge of the image-side surface of the third lens in a direction parallel to the optical axis. Satisfying the above condition (13) can maintain the miniaturization of the system, while also helping to correct coma and field curvature in the off-axis field of view, thus improving image quality. Satisfying the above condition (14) can make the lens head smaller while increasing the depth of the lens head, reducing the lens volume, which is beneficial for achieving a small lens head size and increasing the screen ratio.

[0071] In some embodiments, the optical lens satisfies the following condition:

[0072] 1.5 <f1 / f<2.0;(15)

[0073] Where f represents the effective focal length of the optical system, and f1 represents the focal length of the first lens. Satisfying the above condition (15) makes the light emitted through the first lens smoother and reduces the sensitivity of the optical lens.

[0074] In some embodiments, the optical lens satisfies the following condition:

[0075] 3 <f1 / f3<5;(16)

[0076] Where f1 represents the focal length of the first lens and f3 represents the focal length of the third lens. Satisfying the above condition (16) can not only effectively control the length of the lens group, which is beneficial to the structural design, but also effectively control the dispersion of the defocus curves of each field of view, thereby improving the imaging quality of the lens.

[0077] In some embodiments, the optical lens satisfies the following condition:

[0078] 1.8 <CT3 / ET3<4;(17)

[0079] Wherein, CT3 represents the thickness of the third lens on the optical axis, and ET3 represents the edge thickness of the third lens. By satisfying the above condition (17) and reasonably controlling the thickness ratio of the third lens, it is possible to avoid the phenomenon of air trapped in the middle area of ​​the lens due to the slow plastic filling at the edge of the lens caused by the excessive thickness ratio of the lens during the molding process, resulting in built-in air bubbles in the final product, which affects the appearance and imaging effect; at the same time, if the thickness ratio is too small, the total length of the system will increase, which is not conducive to miniaturization.

[0080] In some embodiments, the optical lens satisfies the following condition:

[0081] 0.22 <BFL / TTL<0.35;(18)

[0082] Wherein, BFL represents the back focal length of the optical lens, and TTL represents the total optical length of the optical lens. By satisfying the above condition (18) and reasonably allocating the back focal length of the system, interference between the lens and the imaging chip due to excessively close proximity during assembly can be avoided, resulting in ineffective imaging. At the same time, the total length of the system can be shortened, achieving lens miniaturization.

[0083] In some embodiments, the optical lens satisfies the following condition:

[0084] 0.45 <Y R42 / IH<0.6; (19)

[0085] Among them, Y R42IH represents the perpendicular distance between the inflection point on the image side of the fourth lens and the optical axis, and IH represents the actual half-image height of the optical lens. By satisfying the above condition (19), the position of the inflection point on the image side of the fourth lens can be reasonably set, which can correct the coma and field curvature of the off-axis field of view and improve the imaging quality.

[0086] As one implementation method, all-plastic lenses or a combination of glass and plastic can be used, both achieving good imaging results. In this application, to further reduce the size and cost of the lens, a combination of four plastic lenses is used. Through specific surface shape matching and reasonable power distribution, the optical lens has the advantages of small head size, small volume, and high image quality, better meeting the high screen-to-body ratio requirements of portable electronic devices. The first to fourth lenses can all be plastic aspherical lenses. Using aspherical lenses can effectively reduce costs, correct aberrations, and provide a more cost-effective optical performance product.

[0087] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0088] In various embodiments of the present invention, when the lens in the optical lens is an aspherical lens, the aspherical surface shape of the lens satisfies the following equation:

[0089]

[0090] Where z is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis, c is the paraxial curvature of the surface, k is the quadratic surface coefficient, and A 2i For the aspherical surface shape coefficient of the 2ith order.

[0091] First Embodiment

[0092] Please see Figure 1 The diagram shown is a schematic diagram of the structure of the optical lens 100 provided in the first embodiment of the present invention. The optical lens 100 includes, in sequence along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, an aperture ST, a third lens L3, a fourth lens L4, and a filter G1.

[0093] The first lens L1 has positive optical power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave.

[0094] The second lens L2 has negative optical power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is concave.

[0095] The third lens L3 has positive optical power, the object side S5 of the third lens is concave, and the image side S6 of the third lens is convex.

[0096] The fourth lens L4 has negative optical power. The object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is concave near the optical axis and has at least one inflection point.

[0097] Among them, the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are all plastic aspherical lenses.

[0098] Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in Table 1.

[0099] Table 1

[0100]

[0101]

[0102] In this embodiment, the aspherical parameters of each lens in the optical lens 100 are shown in Table 2.

[0103] Table 2

[0104]

[0105] Please refer to Figure 2 , Figure 3 as well as Figure 4 The figures shown are the field curvature curve, f-tanθ distortion curve, and transverse chromatic aberration curve of the optical lens 100, respectively. Figure 2 As can be seen, the field curvature is controlled within ±0.05 mm, indicating that the field curvature correction of the optical lens 100 is relatively good. From Figure 3 This shows that the optical distortion of the lens is controlled within ±2.5%, indicating that the distortion of the optical lens 100 has been well corrected. From Figure 4 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within ±2 micrometers, indicating that the transverse chromatic aberration of the optical lens 100 is well corrected. From Figure 2 , Figure 3 , Figure 4 It can be seen that the aberrations of the optical lens 100 are well balanced, resulting in good optical imaging quality.

[0106] Second Embodiment

[0107] like Figure 5The diagram shown is a structural schematic of the optical lens 200 provided in this embodiment. The optical lens 200 in this embodiment is roughly the same as that in the first embodiment described above. The main differences are in the curvature radius, aspherical coefficient, thickness, and material of each lens surface.

[0108] Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in Table 3.

[0109] Table 3

[0110]

[0111]

[0112] In this embodiment, the aspherical parameters of each lens in the optical lens 200 are shown in Table 4.

[0113] Table 4

[0114]

[0115] Please refer to Figure 6 , Figure 7 and Figure 8 The figures shown are the field curvature curve, f-tanθ distortion curve, and transverse chromatic aberration curve of the optical lens 200, respectively. Figure 6 The results show that the field curvature is controlled within ±0.1 mm, indicating that the field curvature correction of the 200mm optical lens is quite good. Figure 7 This shows that optical distortion is controlled within ±2%, indicating that the distortion of the 200mm optical lens has been well corrected. Figure 8 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within ±2 micrometers, indicating that the transverse chromatic aberration of the optical lens 200 is well corrected. From Figure 6 , Figure 7 , Figure 8 It can be seen that the aberrations of the optical lens 200 are well balanced, resulting in good optical imaging quality.

[0116] Third Embodiment

[0117] like Figure 9 The diagram shown is a structural schematic of the optical lens 300 provided in this embodiment. The optical lens 300 in this embodiment is roughly the same as that in the first embodiment described above, except that the radius of curvature, aspherical coefficient, thickness, and material of each lens surface are different.

[0118] Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in Table 5.

[0119] Table 5

[0120]

[0121] In this embodiment, the aspherical parameters of each lens in the optical lens 300 are shown in Table 6.

[0122] Table 6

[0123]

[0124] Please refer to Figure 10 , Figure 11 and Figure 12 The figures shown are the field curvature curve, f-tanθ distortion curve, and transverse chromatic aberration curve of the optical lens 300. Figure 10 As can be seen, the paraxial field curvature is controlled within ±0.1 mm, indicating that the 300mm optical lens has good field curvature correction. Figure 11 This shows that optical distortion is controlled within ±2%, indicating that the distortion of the 300mm optical lens has been well corrected. Figure 12 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within ±1.3 micrometers, indicating that the transverse chromatic aberration of the optical lens 300 is well corrected. From Figure 10 , Figure 11 , Figure 12 It can be seen that the aberrations of the 300mm optical lens are well balanced, resulting in good optical imaging quality.

[0125] Please refer to Table 7, which shows the optical characteristics of the optical lenses provided in the three embodiments above, including the field of view (FOV), total optical length (TTL), actual half-image height (IH), effective focal length (f), and the relevant values ​​corresponding to each of the aforementioned conditional expressions.

[0126] Table 7

[0127] First Embodiment Second Embodiment Third Embodiment FOV (°) 85 85 85 TTL(mm) 3.000 2.955 2.731 f(mm) 1.844 1.817 1.742 EPD 0.812 0.800 0.767 TTL / IH 1.720 1.725 1.669 f / f2 -0.063 -0.050 -0.021 R21 / R22 1.207 2.451 1.168 f1 / f2 -0.109 -0.088 -0.033 CT1 / CT2 2.009 3.010 1.643 CT1 / CT12 14.125 22.808 13.815 f3 / f2 -0.029 -0.025 -0.008 R31 / R32 21.775 6.284 9.577 R41 / R42 -7.477 -37.965 -25.471 R41 / f -2.234 -13.059 -5.527 DM2 / DMi 0.40～0.68 0.42～0.74 0.44～0.77 CT23 / TTL 0.058 0.104 0.146 DM11 / DM32 1.011 1.233 1.115 ALEC13 / TTL 0.360 0.341 0.370 f1 / f 1.721 1.773 1.608 f1 / f3 3.750 3.511 4.153 CT3 / ET3 2.033 2.999 3.477 BFL / TTL 0.246 0.316 0.277 <![CDATA[Y R42 / IH]]> 0.476 0.474 0.513

[0128] As can be seen from the field curvature curves, f-tanθ distortion curves, and lateral chromatic aberration curves of the various embodiments above, the f-tanθ distortion value of the optical lens in each embodiment is within ±2.5%, the field curvature value is within ±0.1mm, and the lateral chromatic aberration is within ±2 micrometers. This indicates that the lens provided by the embodiments of the present invention has advantages such as high pixel count, small distortion, and low sensitivity, while also having good resolution.

[0129] In summary, the optical lens provided in this embodiment has at least the following advantages:

[0130] (1) The outer diameter of the head of optical lenses commonly used in mobile phones on the market is generally within the range of... The optical lens provided by this invention, due to the reasonable setting of the lens surface shape and optical power, and the placement of the aperture stop after the second lens, allows the outer diameter of the lens head to be [redacted]. The lens head outer diameter can be as small as 1.63mm, and the lens head depth can be effectively increased to better meet the high screen-to-body ratio requirements of mobile phones.

[0131] (2) Four plastic aspherical lenses with specific optical power are used, and specific surface shapes are combined to achieve high pixel count and wide viewing angle while making the structure more compact, with a smaller volume and better image quality.

[0132] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0133] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens, characterized in that, There are four lenses with optical power, arranged sequentially along the optical axis from the object side to the image plane: A first lens with positive optical power, wherein the object side of the first lens is convex and the image side of the first lens is concave near the optical axis; A second lens with negative optical power, wherein the object side of the second lens is convex and the image side of the second lens is concave; A third lens with positive optical power, wherein the object-side surface of the third lens is concave and the image-side surface of the third lens is convex; A fourth lens with negative optical power, wherein the object-side surface of the fourth lens is concave near the optical axis, and the image-side surface of the fourth lens is concave near the optical axis and has at least one inflection point; and An aperture stop is disposed between the second lens and the third lens; The total optical length of the optical lens is 2.731mm ≤ TTL < 3.2mm; The optical lens satisfies the following condition: 1.65 <TTL / IH<2.0; Wherein, IH represents the image height corresponding to the maximum half field of view of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.5 <f1 / f<2.0; Where f represents the effective focal length of the optical system, and f1 represents the focal length of the first lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -0.1 <f / f2<0; 1 <R21 / R22<3; Wherein, f2 represents the focal length of the second lens, f represents the effective focal length of the optical lens, R21 represents the radius of curvature of the object side of the second lens, and R22 represents the radius of curvature of the image side of the second lens.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -0.13 <f1 / f2<0; Where f1 represents the focal length of the first lens and f2 represents the focal length of the second lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.5 <CT1 / CT2<3.5; 11 <CT1 / CT12<25; Wherein, CT1 represents the thickness of the first lens on the optical axis, CT2 represents the thickness of the second lens on the optical axis, and CT12 represents the air gap distance between the first lens and the second lens on the optical axis.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -0.05 <f3 / f2<0; Where f2 represents the focal length of the second lens and f3 represents the focal length of the third lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 5 <R31 / R32<30; Wherein, R31 represents the radius of curvature of the object side of the third lens, and R32 represents the radius of curvature of the image side of the third lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -50 <R41 / R42<-5; -20 <R41 / f<-1; Wherein, R41 represents the radius of curvature of the object side of the fourth lens, R42 represents the radius of curvature of the image side of the fourth lens, and f represents the effective focal length of the optical lens.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: DM2 / DMi < 0.8, i = 1, 3 or 4; Wherein, DM1 represents the effective aperture of the first lens, DM2 represents the effective aperture of the second lens, DM3 represents the effective aperture of the third lens, DM4 represents the effective aperture of the fourth lens, and DMi represents the effective aperture of the i-th lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.05 <CT23 / TTL<0.18; Wherein, CT23 represents the air gap distance between the second lens and the third lens on the optical axis.

11. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1 <DM11 / DM32<1.3; 0.3 <ALEC13 / TTL<0.4; Wherein, DM11 represents the half-aperture of the maximum light-transmitting area on the object side of the first lens, DM32 represents the half-aperture of the maximum light-transmitting area on the image side of the third lens, and ALEC13 represents the distance from the edge of the object side of the first lens to the edge of the image side of the third lens.

Images