Optical lens

Abstract

The application provides an optical lens, comprising: a lens barrel; five lenses, a second lens having a central thickness on an optical axis of the optical lens smaller than that of the other four lenses, and the central thickness CT2 of the second lens on the optical axis being smaller than 0.4 mm; a first spacer, the first spacer being in contact with a part of an image side surface of the first lens; a second spacer, the second spacer being in contact with at least a part of an image side surface of the second lens; the height L of the lens barrel, the focal length f of the optical lens, and the maximum field of view FOV of the optical lens satisfying 1.2 < L / [f x tan (FOV / 2)] < 1.6; the focal length f2 of the second lens, the central thickness CT2 of the second lens, the air interval T23 between the second lens and the third lens on the optical axis, the maximum thickness CP2 of the second spacer, and the distance EP12 between the image side surface of the first spacer and the object side surface of the second spacer along the optical axis satisfying -50.0 < f2 / (CT2 + T23) + f2 / (EP12 + CP2) < 0. The application solves the problem that the optical lens in the prior art is difficult to simultaneously consider miniaturization and high image quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging devices, in particular to an optical lens. BACKGROUND

[0002] With the role of mobile phones playing in life more and more important, consumers are more willing to pay for thin, beautiful mobile phone, which leads to the requirements of module manufacturers on the appearance and size of the mobile phone are increasingly high, and various performance lenses mounted on a single mobile phone are increasing, under the premise of ensuring the stability of lens performance and the feasibility of manufacturing, the space ratio of a single lens becomes smaller and the miniaturization of the module gradually becomes the common goal of lens suppliers and module manufacturers. Therefore, under the premise of ensuring the optical performance, reasonable structure design is carried out for the key position relatively close to the front end of the lens, and the obtained ultra-thin and compact optical system is an important subject.

[0003] That is, the optical lens in the prior art has the problem of being difficult to simultaneously consider miniaturization and high image quality. SUMMARY

[0004] The main purpose of the present application is to provide an optical lens to solve the problem that the optical lens in the prior art is difficult to simultaneously consider miniaturization and high image quality.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an optical lens is provided, comprising: a lens barrel; five lenses, a second lens from the object side to the image side has a central thickness on the optical axis of the optical lens smaller than the central thickness on the optical axis of the remaining four lenses, and the central thickness CT2 of the second lens on the optical axis is less than 0.4 millimeters; a first spacer, the first spacer contacts at least a part of the image side surface of the first lens; a second spacer, the second spacer contacts at least a part of the image side surface of the second lens; the height L of the lens barrel, the focal length f of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 1.2 < L / [f x tan (FOV / 2)] < 1.6; the focal length f2 of the second lens, the central thickness CT2 of the second lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, the maximum thickness CP2 of the second spacer, and the distance EP12 between the image side surface of the first spacer and the object side surface of the second spacer along the optical axis satisfy: -50.0 < f2 / (CT2 + T23) + f2 / (EP12 + CP2) < 0.

[0006] Further, at least one of the first four lenses has a positive focal power, and the lens with a positive focal power satisfies: 0.1 < fi / dis < 10.0; wherein fi is the effective focal length of the i-th lens, dis is the inner diameter of the object side surface of the i-th spacer in contact with the image side surface of the i-th lens, i is selected from 1, 2, 3, and 4.

[0007] Further, the absolute value of the focal length of at least one of the first four lenses is less than 5, and the lens with the absolute value of the focal length less than 5 and the image side surface with the spacer in contact satisfies: 0 < Djs / R2j-1 < 5.0, where R2j-1 is the radius of curvature of the object side surface of the jth lens, Djs is the outer diameter of the object side surface of the jth spacer in contact with the image side surface of the jth lens, and j is selected from 1, 2, 3, and 4.

[0008] Further, the optical lens satisfies: 10.0 < f1 / (CP1+EP12)-f2 / (CP2+EP12) < 50.0, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, CP1 is the thickness of the first spacer, CP2 is the thickness of the second spacer, and EP12 is the distance on the optical axis from the image side surface of the first spacer to the object side surface of the second spacer.

[0009] Further, the first lens to the fourth lens satisfy: -10.0 < (R2n+R2n+1) / dns < 70.0, R2n is the radius of curvature of the image side surface of the nth lens, R2n+1 is the radius of curvature of the object side surface of the n+1th lens, dns is the inner diameter of the object side surface of the nth spacer in contact with the image side surface of the nth lens, and n is selected from 1, 2, 3, and 4.

[0010] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, and the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R9 of the object side surface of the fifth lens, the inner diameter d1s of the object side surface of the first spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 1.0 < R2 / d1s+R9 / d4s < 10.0.

[0011] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, and a third spacer in contact with the image side surface of the third lens, the combined focal length f23 of the first lens and the second lens, the combined focal length f45 of the fourth lens and the fifth lens, the distance EP23 along the optical axis from the image side surface of the second spacer to the object side surface of the third spacer, and the distance EP34 along the optical axis from the image side surface of the third spacer to the object side surface of the fourth spacer satisfy: -100.0 < f23 / EP23+f45 / EP34 < 110.0.

[0012] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, an outer diameter D4s of the object side surface of the fourth spacer, and satisfy: 5.0 < D2s / (CT2+CT3) + D4s / (CT4+CT5) < 15.0.

[0013] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, an outer diameter D4s of the object side surface of the fourth spacer, and satisfy: 5.0 < D2s / (CT2+CT3) + D4s / (CT4+CT5) < 15.0.

[0014] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, an outer diameter D4s of the object side surface of the fourth spacer, and satisfy: 5.0 < D2s / (CT2+CT3) + D4s / (CT4+CT5) < 15.0.

[0015] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, an outer diameter D4s of the object side surface of the fourth spacer, and satisfy: 5.0 < D2s / (CT2+CT3) + D4s / (CT4+CT5) < 15.0.

[0016] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, an outer diameter D4s of the object side surface of the fourth spacer, and satisfy: 5.0 < D2s / (CT2+CT3) + D4s / (CT4+CT5) < 15.0.

[0017] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, an outer diameter D4s of the object side surface of the fourth spacer, and satisfy: 5.0 < D2s / (CT2+CT3) + D4s / (CT4+CT5) < 15.0.

[0018] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, an outer diameter D4s of the object side surface of the fourth spacer, and satisfy: 5.0 < D2s / (CT2+CT3) + D4s / (CT4+CT5) < 15.0.

[0019] In accordance with another aspect of the present application, there is provided an optical lens comprising: a lens barrel; five lenses, a second lens from an object side to an image side has a central thickness on an optical axis of the optical lens smaller than a central thickness on the optical axis of the remaining four lenses, and the central thickness CT2 of the second lens on the optical axis is smaller than 0.4 mm; a first spacer, the first spacer is in contact with at least a portion of an image side surface of the first lens; a second spacer, the second spacer is in contact with at least a portion of an image side surface of the second lens; a height L of the lens barrel, a focal length f of the optical lens, a maximum field of view FOV of the optical lens satisfy: 1.2 < L / [f x tan(FOV / 2)] < 1.6; an effective focal length f1 of the first lens, an effective focal length f2 of the second lens, a thickness CP1 of the first spacer, a thickness CP2 of the second spacer, a distance EP12 on the optical axis from an image side surface of the first spacer to an object side surface of the second spacer satisfy: 10.0 < f1 / (CP1 + EP12) - f2 / (CP2 + EP12) < 50.0.

[0020] Further, at least one lens of the first four lenses has a positive focal power, and the lens with positive focal power satisfies: 0.1 < fi / dis < 10.0; where fi is an effective focal length of the ith lens, dis is an inner diameter of an object side surface of the ith spacer in contact with an image side surface of the ith lens, i is selected from 1, 2, 3, 4.

[0021] Further, at least one lens of the first four lenses has a focal length with an absolute value smaller than 5, and the lens with focal length with an absolute value smaller than 5 and with an image side surface having a spacer in contact satisfies: 0 < Djs / R2j-1 < 5.0, where R2j-1 is a curvature radius of an object side surface of the jth lens, Djs is an outer diameter of an object side surface of the jth spacer in contact with an image side surface of the jth lens, j is selected from 1, 2, 3, 4.

[0022] Further, the first lens to the fourth lens satisfy: -10.0 < (R2n + R2n+1) / dns < 70.0, R2n is a curvature radius of an image side surface of the nth lens, R2n+1 is a curvature radius of an object side surface of the nth+1 lens, dns is an inner diameter of an object side surface of the nth spacer in contact with an image side surface of the nth lens, n is selected from 1, 2, 3, 4.

[0023] Further, the optical lens further comprises a fourth spacer in contact with an image side surface of the fourth lens, a curvature radius R2 of an image side surface of the first lens, a curvature radius R9 of an object side surface of the fifth lens, an inner diameter d1s of an object side surface of the first spacer, an inner diameter d4s of an object side surface of the fourth spacer satisfy: 1.0 < R2 / d1s + R9 / d4s < 10.0.

[0024] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a third spacer in contact with the image side surface of the third lens, the combined focal length f23 of the first lens and the second lens, the combined focal length f45 of the fourth lens and the fifth lens, the distance EP23 between the image side surface of the second spacer and the object side surface of the third spacer along the optical axis, the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer along the optical axis satisfy: -100.0 < f23 / EP23 + f45 / EP34 < 110.0.

[0025] Further, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, the central thickness CT2 of the second lens along the optical axis, the central thickness CT3 of the third lens along the optical axis, the central thickness CT5 of the fifth lens along the optical axis, the outer diameter D2s of the object side surface of the second spacer, the outer diameter D4s of the object side surface of the fourth spacer satisfy: 5.0 < D2s / (CT2+CT3) + D4s / (CT4+CT5) < 15.0.

[0026] Further, the entrance pupil diameter EPD of the optical lens, the inner diameter d1s of the object side surface of the first spacer, the effective focal length f of the optical lens, the effective focal length f1 of the first lens satisfy: 5.0 < (EPD+d1s) / (f-f1) < 20.0.

[0027] Further, the optical power of the first lens and the optical power of the second lens are opposite in sign, and the absolute value of the effective focal length of the first lens is smaller than the absolute value of the effective focal length of the third lens.

[0028] Further, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens satisfy: |f1 / f3| < 1.0, f1 / f2 < -0.01.

[0029] Further, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R6 of the image side surface of the third lens satisfy: R3 > R4, |R4| < |R6|.

[0030] Further, the absolute value of the radius of curvature of the first lens to the fourth lens is greater than the absolute value of the radius of curvature of the image side surface of the fifth lens.

[0031] Further, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens satisfy: R1 / R9 > 0.1, R2 / R10 > 1.0.

[0032] The optical lens comprises a lens barrel, five lenses, a first spacer and a second spacer, the central thickness of the second lens on the optical axis of the optical lens from the object side to the image side is less than the central thickness of the remaining four lenses on the optical axis, and the central thickness CT2 of the second lens on the optical axis is less than 0.4 mm; the first spacer is in contact with at least part of the image side surface of the first lens; the second spacer is in contact with at least part of the image side surface of the second lens; the height L of the lens barrel, the focal length f of the optical lens and the maximum field of view FOV of the optical lens satisfy the following relationship: 1.2 < L / [f x tan (FOV / 2)] < 1.6; the focal length f2 of the second lens, the central thickness CT2 of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, the maximum thickness CP2 of the second spacer and the distance EP12 between the image side surface of the first spacer and the object side surface of the second spacer along the optical axis satisfy the following relationship: -50.0 < f2 / (CT2 + T23) + f2 / (EP12 + CP2) < 0.

[0033] By reasonably designing the overall height of the lens barrel, the focal length, the central thickness of the first to third lenses, the interval distance and the spacer distance, the matching degree of the optical lens and the chip is improved, the demand for ultra-thin characteristics is met, the useless light generated by the incident light with poor edge quality of the second surface of the first lens and the internal reflection of the first lens mechanism is effectively reduced, the effective focal length of the optical imaging system is reasonably controlled, the central thickness of the remaining lenses is adjusted, the performance of the system coma is reasonably controlled, the position proportion of the second lens and the third lens in the imaging system is reduced, the front part size of the imaging system is controlled, the compactness of the imaging system structure is improved, the optical system has good optical performance, and the demand for ultra-thin performance is further met, so that the five-piece optical lens in the application has the advantages of high image quality and miniaturization. BRIEF DESCRIPTION OF DRAWINGS

[0034] The drawings accompanying the specification of this application serve to provide a further understanding of the application, the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0035] Figure 1 A structural schematic diagram of an optical lens of an optional embodiment of the application is shown;

[0036] Figures 2 to 4 Structural schematic diagrams of the optical lens of example one of the application in a first state, a second state and a third state are respectively shown;

[0037] Figures 5 to 8 Axial chromatic aberration curves, astigmatism curves, distortion curves and magnification chromatic aberration curves of example one of the application are respectively shown.

[0038] Figures 9 to 11 Fig. 1 shows the structure of the optical lens of Example 1 in the first state, the second state and the third state, respectively;

[0039] Figures 12 to 15 Fig. 2 shows the on-axis chromatic aberration curve, the astigmatism curve, the distortion curve and the lateral chromatic aberration curve of Example 1, respectively.

[0040] Figures 16 to 18 Fig. 3 shows the structure of the optical lens of Example 2 in the first state, the second state and the third state, respectively;

[0041] Figures 19 to 22 Fig. 4 shows the on-axis chromatic aberration curve, the astigmatism curve, the distortion curve and the lateral chromatic aberration curve of Example 2, respectively.

[0042] In the above drawings, the following reference signs are used:

[0043] 10, barrel; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; P1, first spacer; E2, second lens; S3, object side surface of the second lens; S4, image side surface of the second lens; P2, second spacer; E3, third lens; S5, object side surface of the third lens; S6, image side surface of the third lens; P3, third spacer; P3b, third auxiliary spacer; E4, fourth lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; P4, fourth spacer; P4b, fourth auxiliary spacer; E5, fifth lens; S9, object side surface of the fifth lens; S10, image side surface of the fifth lens. DETAILED DESCRIPTION

[0044] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict, and the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0045] It should be noted that, unless otherwise specified, all the technical and scientific terms used in the present application have the same meaning as that generally understood by those skilled in the art to which the present application belongs.

[0046] In the present application, unless otherwise specified, the orientation words such as "upper", "lower", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0047] It should be noted that in the present specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0048] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0049] In the present specification, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be made in accordance with the judgment method of those skilled in the art, with the sign of R (R refers to the radius of curvature in the paraxial region, usually refers to the R value on the lens data in the optical software) to judge the convexity and concavity. In terms of the object side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave. In terms of the image side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0050] In order to solve the problem that the optical lens in the prior art is difficult to simultaneously consider miniaturization and high image quality, the present application provides an optical lens.

[0051] As shown in Figures 1 to 22 The optical lens includes a lens barrel, five lenses, a first spacer, and a second spacer. The central thickness of the second lens on the optical axis of the optical lens is smaller than the central thickness of the remaining four lenses on the optical axis, and the central thickness CT2 of the second lens on the optical axis is less than 0.4 mm. The first spacer is in contact with at least a portion of the image side surface of the first lens. The second spacer is in contact with at least a portion of the image side surface of the second lens. The height L of the lens barrel, the focal length f of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following relationship: 1.2 < L / [f x tan (FOV / 2)] < 1.6. The focal length f2 of the second lens, the central thickness CT2 of the second lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, the maximum thickness CP2 of the second spacer, and the distance EP12 between the image side surface of the first spacer and the object side surface of the second spacer along the optical axis satisfy the following relationship: -50.0 < f2 / (CT2 + T23) + f2 / (EP12 + CP2) < 0.

[0052] By reasonable design of the overall height of the lens barrel, the focal length, the center thickness of the first to third lenses, the interval distance and the spacer interval distance, the matching degree of the optical lens and the chip is improved, the demand for ultra-thin characteristics is met, the useless light generated by the incident light with poor edge quality of the second surface of the first lens and the internal reflection of the first lens mechanism is effectively reduced, the effective focal length of the optical imaging system is reasonably controlled and the center thickness of the remaining lenses is adjusted, the performance of the coma of the system is reasonably controlled, the position ratio of the second lens and the third lens in the imaging system is reduced, the size of the front part of the imaging system is controlled, the compactness of the structure of the imaging system is improved, the optical system has good optical performance, and the demand for ultra-thin performance is further met, so that the five-piece optical lens in the application has the advantages of high image quality and miniaturization.

[0053] Specifically, by limiting L / [fxtan(FOV / 2)] within a reasonable range, the height L of the lens barrel, the focal length f of the optical lens and the field of view angle are mutually restrained, the incident angle of the chief ray on the object side of the optical lens can be effectively reduced, the matching degree of the optical lens and the chip can be improved while meeting the demand for ultra-thin characteristics. The focal length and the field of view angle of the optical lens are within a reasonable range, which can ensure the imaging quality of the optical lens while realizing miniaturization and high image quality. By controlling the height L, the focal length f and the field of view angle FOV of the lens barrel, the center thickness CT2 of the second lens is constrained, which can effectively reduce the incident light with poor edge quality of the image side of the first lens and the useless light generated by the internal reflection of the first lens, increase the uniformity of light distribution in all directions, and match the focal length f2 of the second lens, the air interval T23 between the second lens and the third lens, the maximum thickness CP2 of the second spacer, the distance EP12 of the image side of the first spacer and the object side of the second spacer along the optical axis, which can effectively control the overall length of the optical lens, reasonably constrain the field curvature of the system within a certain range, so that the optical lens obtains more light quantity and better imaging effect, and helps to reasonably control the effective focal length f of the optical lens, adjust the center thickness of the remaining lenses, control the coma within a reasonable range while reducing the volume of the optical lens. By limiting CT2 and T23, the position ratio of the second lens and the third lens in the optical system can be reduced, so as to control the size of the front part of the optical lens, ensure that the optical lens has good optical performance, improve the compactness of the structure of the optical lens, and further meet the demand for ultra-thin performance.

[0054] Preferably, the height L of the lens barrel, the focal length f of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 1.3 < L / [f x tan (FOV / 2)] < 1.4; the focal length f2 of the second lens, the central thickness CT2 of the second lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, the maximum thickness CP2 of the second spacer, and the distance EP12 between the image side surface of the first spacer and the object side surface of the second spacer along the optical axis satisfy: -40 < f2 / (CT2 + T23) + f2 / (EP12 + CP2) < -30.

[0055] In the embodiment, at least one of the first four lenses has positive refractive power, and the lens with positive refractive power satisfies: 0.1 < fi / dis < 10.0; where fi is the effective focal length of the ith lens, and dis is the inner diameter of the object side surface of the ith spacer in contact with the image side surface of the ith lens. Since the converging and telephoto capabilities of lenses with different face shapes and bending degrees are different, the stray light conditions are also different when passing through lenses with different positive refractive power. Therefore, by controlling the relationship between the inner diameter of the object side surface of the spacer in contact with the image side of the lens with positive refractive power and the focal length of the lens, the spherical ghost image generated at the image side of the lens with positive refractive power can be improved. At the same time, by controlling the number and position of the lenses with positive refractive power, the relative luminance of the off-axis field of view can be improved. In combination with the reasonable matching of the refractive power of the remaining lenses, the compactness of the optical lens structure can be further achieved, and the off-axis aberration can be corrected to improve the overall image quality of the system. Wherein i is selected from 1, 2, 3, and 4. Preferably, 0.9 < fi / dis < 10.0.

[0056] In the embodiment, the absolute value of the focal length of at least one of the first four lenses is less than 5, and the lens with an absolute value of the focal length less than 5 and an image side surface in contact with a spacer satisfies: 0 < Djs / R2j-1 < 5.0, where R2j-1 is the radius of curvature of the object side surface of the jth lens, and Djs is the outer diameter of the object side surface of the jth spacer in contact with the image side surface of the jth lens. By setting the absolute value of the focal length of at least one lens to be less than 5, the overall size of the optical lens can be reduced, which is beneficial to space saving and miniaturization of the optical imaging lens. At the same time, by controlling the radius of curvature of the object side surface of the lens with an absolute value of the focal length less than 5 and the outer diameter of the object side surface of the spacer in contact with the image side surface of the lens within a reasonable range, the light blocking area can be increased, the stray light can be effectively reduced, and the overall stray light of the optical lens can be improved while ensuring the miniaturization of the optical lens. j is selected from 1, 2, 3, and 4. Preferably, 0.3 < Djs / R2j-1 < 2.2.

[0057] In the embodiment, the optical lens satisfies: 10.0 < f1 / (CP1+EP12)-f2 / (CP2+EP12) < 50.0, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, CP1 is the thickness of the first spacer, CP2 is the thickness of the second spacer, and EP12 is the distance on the optical axis from the image side surface of the first spacer to the object side surface of the second spacer. By controlling the effective focal lengths of the first lens and the second lens within a reasonable range, the first lens and the second lens generate positive spherical aberration and balance the negative spherical aberration generated by other lenses, thereby controlling the entire optical lens to have good imaging quality. At the same time, in combination with CP1 and CP2, the last lens can be prevented from protruding from the lens barrel when the components are assembled within the limit tolerance, the risk of lens surface scratching is reduced, and the yield of the optical lens is ensured. The distance between the first spacer and the second spacer determines the edge thickness of the second lens, and controlling the edge thickness of the second lens and the center thickness of the second lens within a reasonable range can ensure the shape of the second lens, ensure the forming strength and assembly stability of the second lens, and effectively ensure the yield of the optical lens. Preferably, 22 < f1 / (CP1+EP12)-f2 / (CP2+EP12) < 30.

[0058] In the embodiment, the first lens to the fourth lens satisfy: -10.0 < (R2n+R2n+1) / dns < 70.0, R2n is the curvature radius of the image side surface of the nth lens, R2n+1 is the curvature radius of the object side surface of the (n+1)th lens, dns is the inner diameter of the object side surface of the nth spacer in contact with the image side surface of the nth lens, and n takes a value from 1, 2, 3, and 4. Controlling the curvature radii of the two opposite surfaces of the adjacent two lenses and the inner diameter of the spacer therebetween within a certain range can avoid the excess light outside the effective diameter of the lens from being reflected one or more times between the lenses, effectively reducing the generation of stray light and ghost images, and also can control the aberration generated at the fourth lens of the optical lens, effectively increasing the imaging quality of the optical lens. Preferably, -9 < (R2n+R2n+1) / dns < 63.

[0059] It should be noted that 2n+1 in R2n+1 is the index of R, not 2(n+1) nor (R2n)+1.

[0060] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, and the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R9 of the object side surface of the fifth lens, the inner diameter d1s of the object side surface of the first spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 1.0 < R2 / d1s+R9 / d4s < 10.0. By controlling the radius of curvature of the image side surface of the first lens and the radius of curvature of the image side surface of the fifth lens within a reasonable range, the refraction angle of light in the corresponding lens can be reasonably controlled, the relationship between the remaining lenses is reasonably controlled, and the cooperation of each lens is more compact. At the same time, by controlling the inner diameter of the object side surface of the fourth spacer, the light path reflected by the edge mechanism of the effective diameter of the object side surface of the fourth lens can be effectively blocked, and the formation of stray light is avoided. The generation of stray light is effectively reduced. The first spacer can effectively block the non-imaging light generated by the first lens to reduce the non-imaging light entering the subsequent optical system. Preferably, 4.0 < R2 / d1s+R9 / d4s < 5.

[0061] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a third spacer in contact with the image side surface of the third lens, a combined focal length f23 of the first lens and the second lens, a combined focal length f45 of the fourth lens and the fifth lens, a distance EP23 along the optical axis between the image side surface of the second spacer and the object side surface of the third spacer, and a distance EP34 along the optical axis between the image side surface of the third spacer and the object side surface of the fourth spacer satisfy: -100.0 < f23 / EP23+f45 / EP34 < 110.0. By controlling f23 and f45 within a reasonable range, the contribution of the adjacent two lenses between the second lens and the fifth lens to the aberration can be controlled, and the aberration generated by the front optical element is balanced, so that the aberration of the optical lens is at a reasonable level. At the same time, by controlling EP23 and EP34 within a reasonable range, the edge thickness of the third lens and the fourth lens can be controlled within a certain range, so that the best forming structure is achieved within a certain range while the total length of the optical lens is reduced. Preferably, -70.0 < f23 / EP23+f45 / EP34 < 105.

[0062] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, and an outer diameter D4s of the object side surface of the fourth spacer, and a relationship between them satisfies: 5.0 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 15.0. By controlling the relationship between the central thicknesses of the second lens to the fifth lens and the outer diameters of the object side surfaces of the second spacer and the fourth spacer, the deformation of the lenses during assembly can be controlled, and at the same time the structural strength of the lenses can be ensured, so as to limit the variation of the field curvature of the optical lens within a certain range, thereby reducing the sensitivity of the optical lens and improving the assembly yield of the optical lens. Preferably, 8 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 11.

[0063] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, and an outer diameter D4s of the object side surface of the fourth spacer, and a relationship between them satisfies: 5.0 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 15.0. By controlling the relationship between the central thicknesses of the second lens to the fifth lens and the outer diameters of the object side surfaces of the second spacer and the fourth spacer, the deformation of the lenses during assembly can be controlled, and at the same time the structural strength of the lenses can be ensured, so as to limit the variation of the field curvature of the optical lens within a certain range, thereby reducing the sensitivity of the optical lens and improving the assembly yield of the optical lens. Preferably, 8 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 11.

[0064] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, and an outer diameter D4s of the object side surface of the fourth spacer, and a relationship between them satisfies: 5.0 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 15.0. By controlling the relationship between the central thicknesses of the second lens to the fifth lens and the outer diameters of the object side surfaces of the second spacer and the fourth spacer, the deformation of the lenses during assembly can be controlled, and at the same time the structural strength of the lenses can be ensured, so as to limit the variation of the field curvature of the optical lens within a certain range, thereby reducing the sensitivity of the optical lens and improving the assembly yield of the optical lens. Preferably, 8 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 11.

[0065] Specifically, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: |f1 / f3| < 1.0, f1 / f2 < -0.01. Preferably, 0.1 < |f1 / f3| < 0.5; -0.5 < f1 / f2 < -0.3.

[0066] In the embodiment, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, and the radius of curvature R6 of the image side surface of the third lens satisfy R3>R4 and |R4|<|R6|. By controlling the sizes of the radii of curvature of different lenses, the total deflection angle of the edge field on the two surfaces can be reasonably controlled within a reasonable range, and the sensitivity of the optical lens can be effectively reduced.

[0067] In the embodiment, the absolute values of the radii of curvature of the first lens to the fourth lens are greater than the absolute value of the radius of curvature of the image side surface of the fifth lens. By limiting the relationship between the radii of curvature of the first lens to the fourth lens and the image side surface of the fifth lens, the imaging quality of the light rays passing through the first lens to the fourth lens is more favorable, and reasonable control of the radii of curvature of the lenses can make the angle of the light rays of the edge field within a reasonable range, thereby effectively reducing the sensitivity of the optical lens.

[0068] Specifically, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R9 of the object side surface of the fifth lens, and the radius of curvature R10 of the image side surface of the fifth lens satisfy R1 / R9>0.1 and R2 / R10>1.0. The absolute values of the radii of curvature of the first lens to the fourth lens are greater than the absolute value of the radius of curvature of the image side surface of the fifth lens, but not necessarily greater than the absolute value of the radius of curvature of the object side surface of the fifth lens, so as to increase the design freedom of the first lens to the fourth lens. Preferably, 0.5<R1 / R9<1 and 5<R2 / R10<9.

[0069] Embodiment Two

[0070] As shown in Figures 1 to 22 the optical lens includes a lens barrel, five lenses, a first spacer, and a second spacer. The central thickness of the second lens on the optical axis of the optical lens is less than the central thickness of the other four lenses on the optical axis, and the central thickness CT2 of the second lens on the optical axis is less than 0.4 mm. The first spacer is in contact with at least a portion of the image side surface of the first lens. The second spacer is in contact with at least a portion of the image side surface of the second lens. The height L of the lens barrel, the focal length f of the optical lens, and the maximum field of view FOV of the optical lens satisfy 1.2<L / [f×tan(FOV / 2)]<1.6. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the thickness CP1 of the first spacer, the thickness CP2 of the second spacer, and the distance EP12 between the image side surface of the first spacer and the object side surface of the second spacer on the optical axis satisfy 10.0<f1 / (CP1+EP12)-f2 / (CP2+EP12)<50.0.

[0071] By limiting L / [f x tan(FOV / 2)] in a reasonable range, the height L of the lens barrel, the focal length f of the optical lens and the field of view angle are mutually restrained, which can effectively reduce the incidence angle of the chief ray on the object side of the optical lens, improve the matching degree of the optical lens and the chip, and meet the demand of ultra-thin characteristics. The focal length and the field of view angle of the optical lens are within a reasonable range, which can ensure the imaging quality of the optical lens, and realize miniaturization and high image quality. Under the condition of controlling the height L of the lens barrel, the focal length f and the field of view angle FOV, and matching with CP1 and CP2, the last lens can be prevented from protruding from the lens barrel under the cooperation of various structural parts at the limit tolerance during assembly, the risk of scratching the lens surface is reduced, and the yield of the optical lens is ensured. The distance between the first spacer and the second spacer determines the edge thickness of the second lens, and controlling the edge thickness of the second lens and the center thickness of the second lens within a reasonable range can ensure the shape of the second lens, ensure the forming strength and assembly stability of the second lens, and effectively ensure the yield of the optical lens. Further controlling the effective focal length of the first lens and the second lens within a reasonable range makes the first lens and the second lens produce positive spherical aberration, and balance the negative spherical aberration produced by other lenses, so as to control the whole optical lens to have good imaging quality, ensure the optical lens to have good optical performance, improve the compactness of the structure of the optical lens, and further meet the demand of ultra-thin performance.

[0072] Preferably, 1.3 < L / [f x tan(FOV / 2)] < 1.4; 22 < f1 / (CP1+EP12)-f2 / (CP2+EP12) < 30.

[0073] In the embodiment, at least one of the first four lenses has positive refractive power, and the lens with positive refractive power satisfies: 0.1 < fi / dis < 10.0; wherein fi is the effective focal length of the i-th lens, and dis is the inner diameter of the object side of the i-th spacer in contact with the image side of the i-th lens. Since lenses with different face shapes and different degrees of curvature have different convergence and telephoto capabilities, the amount of stray light passing through lenses with different positive refractive power is different, and then by controlling the relationship between the inner diameter of the object side of the spacer in contact with the image side of the lens with positive refractive power and the focal length of the lens, the spherical ghost image generated at the image side of the lens with positive refractive power can be improved; at the same time, by controlling the number and position of the lenses with positive refractive power, the relative luminance of the off-axis field of view can be improved, and then by reasonably matching the different refractive powers of the remaining lenses, the compactness of the structure of the optical lens can be further realized, and the off-axis aberration can be corrected to improve the overall image quality of the system. Wherein i is selected from 1, 2, 3 and 4. Preferably, 0.9 < fi / dis < 10.0.

[0074] In the embodiment, the absolute value of the focal length of at least one of the first four lenses is less than 5, and the lens with the absolute value of the focal length less than 5 and the image side surface with the abutting spacer satisfies: 0 < Djs / R2j-1 < 5.0, where R2j-1 is the radius of curvature of the object side surface of the jth lens, and Djs is the outer diameter of the object side surface of the jth spacer abutting the image side surface of the jth lens. By setting the absolute value of the focal length of at least one lens to be less than 5, the overall size of the optical lens can be reduced, which is beneficial to save space and facilitate the miniaturization of the optical imaging lens. At the same time, by controlling the radius of curvature of the object side surface of the lens with the absolute value of the focal length less than 5 and the outer diameter of the object side surface of the spacer abutting the image side surface within a reasonable range, the light blocking area can be increased, the stray light can be effectively reduced, and the overall stray light of the optical lens can be improved while ensuring the miniaturization of the optical lens. Wherein j is selected from 1, 2, 3, and 4. Preferably, 0.3 < Djs / R2j-1 < 2.2.

[0075] In the embodiment, the first lens to the fourth lens satisfy: -10.0 < (R2n+R2n+1) / dns < 70.0, R2n is the radius of curvature of the image side surface of the nth lens, R2n+1 is the radius of curvature of the object side surface of the n+1th lens, dns is the inner diameter of the object side surface of the nth spacer abutting the image side surface of the nth lens, and n is selected from 1, 2, 3, and 4. By controlling the radius of curvature of the two opposite surfaces of the adjacent two lenses and the inner diameter of the spacer therebetween within a certain range, it can be avoided that the excess light outside the effective diameter of the lens is reflected one or more times between the lenses, which effectively reduces the generation of stray light and ghost image, and at the same time, the aberration generated at the fourth lens of the optical lens can also be controlled, thereby effectively increasing the imaging quality of the optical lens. Preferably, -9 < (R2n+R2n+1) / dns < 63.

[0076] It should be noted that 2n+1 in R2n+1 is the index of R, not 2(n+1) nor (R2n)+1.

[0077] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, and the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R9 of the object side surface of the fifth lens, the inner diameter d1s of the object side surface of the first spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 1.0 < R2 / d1s+R9 / d4s < 10.0. By controlling the radius of curvature of the image side surface of the first lens and the radius of curvature of the image side surface of the fifth lens within a reasonable range, the refraction angle of light in the corresponding lens can be reasonably controlled, the relationship between the remaining lenses is reasonably controlled, and the cooperation of each lens is more compact. At the same time, by controlling the inner diameter of the object side surface of the fourth spacer, the light path reflected by the edge mechanism of the effective diameter of the object side surface of the fourth lens can be effectively blocked, and the formation of stray light is avoided. The generation of stray light is effectively reduced. The first spacer can effectively block the non-imaging light generated by the first lens to reduce the non-imaging light entering the subsequent optical system. Preferably, 4.0 < R2 / d1s+R9 / d4s < 5.

[0078] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a third spacer in contact with the image side surface of the third lens, a combined focal length f23 of the first lens and the second lens, a combined focal length f45 of the fourth lens and the fifth lens, a distance EP23 along the optical axis between the image side surface of the second spacer and the object side surface of the third spacer, and a distance EP34 along the optical axis between the image side surface of the third spacer and the object side surface of the fourth spacer satisfy: -100.0 < f23 / EP23+f45 / EP34 < 110.0. By controlling f23 and f45 within a reasonable range, the contribution of the adjacent two lenses between the second lens and the fifth lens to the aberration can be controlled, and the aberration generated by the front optical element is balanced, so that the aberration of the optical lens is at a reasonable level. At the same time, by controlling EP23 and EP34 within a reasonable range, the edge thickness of the third lens and the fourth lens can be controlled within a certain range, so that the best forming structure is achieved within a certain range while the total length of the optical lens is reduced. Preferably, -70.0 < f23 / EP23+f45 / EP34 < 105.

[0079] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, and an outer diameter D4s of the object side surface of the fourth spacer, and a relationship between them satisfies: 5.0 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 15.0. By controlling the relationship between the central thicknesses of the second lens to the fifth lens and the outer diameters of the object side surfaces of the second spacer and the fourth spacer, the deformation of the lenses during assembly can be controlled, and the structural strength of the lenses can be ensured to limit the variation of the field curvature of the optical lens within a certain range, to reduce the sensitivity of the optical lens and improve the assembly yield of the optical lens. Preferably, 8 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 11.

[0080] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, and an outer diameter D4s of the object side surface of the fourth spacer, and a relationship between them satisfies: 5.0 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 15.0. By controlling the relationship between the central thicknesses of the second lens to the fifth lens and the outer diameters of the object side surfaces of the second spacer and the fourth spacer, the deformation of the lenses during assembly can be controlled, and the structural strength of the lenses can be ensured to limit the variation of the field curvature of the optical lens within a certain range, to reduce the sensitivity of the optical lens and improve the assembly yield of the optical lens. Preferably, 8 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 11.

[0081] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, and an outer diameter D4s of the object side surface of the fourth spacer, and a relationship between them satisfies: 5.0 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 15.0. By controlling the relationship between the central thicknesses of the second lens to the fifth lens and the outer diameters of the object side surfaces of the second spacer and the fourth spacer, the deformation of the lenses during assembly can be controlled, and the structural strength of the lenses can be ensured to limit the variation of the field curvature of the optical lens within a certain range, to reduce the sensitivity of the optical lens and improve the assembly yield of the optical lens. Preferably, 8 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 11.

[0082] In the embodiment, the optical lens further comprises a fourth spacer in contact with the image side surface of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side surface of the second spacer, and an outer diameter D4s of the object side surface of the fourth spacer, and a relationship between them satisfies: 5.0 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 15.0. By controlling the relationship between the central thicknesses of the second lens to the fifth lens and the outer diameters of the object side surfaces of the second spacer and the fourth spacer, the deformation of the lenses during assembly can be controlled, and the structural strength of the lenses can be ensured to limit the variation of the field curvature of the optical lens within a certain range, to reduce the sensitivity of the optical lens and improve the assembly yield of the optical lens. Preferably, 8 < D2s / (CT2+CT3)+D4s / (CT4+CT5) < 11.

[0083] In the embodiment, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, and the radius of curvature R6 of the image side surface of the third lens satisfy R3>R4 and |R4|<|R6|. By controlling the sizes of the radii of curvature of different lenses, the total deflection angle of the edge field on the two surfaces can be reasonably controlled within a reasonable range, and the sensitivity of the optical lens can be effectively reduced.

[0084] In the embodiment, the absolute values of the radii of curvature of the first lens to the fourth lens are greater than the absolute value of the radius of curvature of the image side surface of the fifth lens. By limiting the relationship between the radii of curvature of the first lens to the fourth lens and the image side surface of the fifth lens, the imaging quality of the light rays passing through the first lens to the fourth lens can be more favorable, and the radii of curvature of the lenses can be reasonably controlled to make the angle of the light rays of the edge field within a reasonable range, thereby effectively reducing the sensitivity of the optical lens.

[0085] In the embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R9 of the object side surface of the fifth lens, and the radius of curvature R10 of the image side surface of the fifth lens satisfy R1 / R9>0.1 and R2 / R10>1.0. The absolute values of the radii of curvature of the first lens to the fourth lens are greater than the absolute value of the radius of curvature of the image side surface of the fifth lens, but not necessarily greater than the absolute value of the radius of curvature of the object side surface of the fifth lens, so as to increase the design freedom of the first lens to the fourth lens. Preferably, 0.5<R1 / R9<1 and 5<R2 / R10<9.

[0086] The optical lens in the application can adopt multiple lenses and multiple spacers, for example, the five lenses described above. By reasonably allocating the effective focal length, surface shape, central thickness of each lens, axial distance between each lens, inner diameter and outer diameter of each spacer, etc., the imaging quality of the optical lens can be effectively improved, the sensitivity of the lens can be reduced, the processability of the lens can be improved, the optical lens is more favorable for production and processing, and can be applied to portable electronic devices such as smart phones.

[0087] In the application, at least one of the lens surfaces of each lens is a non-spherical lens surface. The non-spherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens with constant curvature from the center of the lens to the periphery of the lens, the non-spherical lens has better radius of curvature characteristics, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using the non-spherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0088] However, those skilled in the art should understand that the number of lenses constituting the optical lens can be changed without departing from the technical solutions claimed in the present application, to obtain the various results and advantages described in the specification. For example, although described in the embodiments by way of example with five lenses, the optical lens is not limited to including five lenses. If necessary, the optical lens can also include other numbers of lenses.

[0089] Figure 1 The structural schematic diagram of one optical lens of the present application is shown. Figure 1 The parameters d1s, D1S, D1m, etc. are also marked in the middle to clearly and intuitively understand the meaning of the parameters. In order to facilitate the display of the structure of the optical lens and the specific surface shape, these parameters are no longer embodied in the drawings when specific examples are described later.

[0090] In the present application, Dis refers to the outer diameter of the object side surface of the i-th spacer, dis refers to the inner diameter of the object side surface of the i-th spacer, Dim refers to the outer diameter of the image side surface of the i-th spacer, dim refers to the inner diameter of the image side surface of the i-th spacer, and CPi refers to the maximum thickness of the i-th spacer, wherein i takes a value from 1, 2, 3, 4. EPij refers to the distance between the image side surface of the i-th spacer and the object side surface of the j-th spacer along the optical axis, wherein j > i, and i takes a value from 1, 2, 3. It should be noted that the distance between the object side surface and the image side surface of the spacer in the extension direction of the optical axis has a maximum value, and is not infinite. The maximum thickness refers to the maximum distance between the object side surface and the image side surface of the spacer in the extension direction of the optical axis.

[0091] The specific surface shape and parameters of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the drawings.

[0092] It should be noted that in the following examples, there are first, second and third states, and the radius of curvature, central thickness and other parameters of the first, second, third, fourth and fifth lenses of the optical lens in the first, second and third states in the same example, as well as the spacing distance between the lenses and the high-order image coefficients are the same, but the parameters such as the thickness of the lens barrel 10, the inner diameter and the outer diameter of the spacer, and the distance between the spacers are different, and the shapes of some lenses are different. Or, the main structure for imaging is the same, and the auxiliary structure for imaging is different.

[0093] It should be noted that any one of the following examples one to three is applicable to all embodiments of the present application.

[0094] Example One

[0095] As shown in Figures 2 to 8 , the optical lens of example one of the present application is described.Figure 2 Fig. 1 shows a structural schematic diagram of the optical lens of example one in a first state, Figure 3 Fig. 2 shows a structural schematic diagram of the optical lens of example one in a second state, Figure 4 Fig. 3 shows a structural schematic diagram of the optical lens of example one in a third state.

[0096] As shown in Figures 2 to 4 the optical lens comprises, in sequence from the object side to the image side: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, and a fifth lens E5. The object side surface and the image side surface of the ith spacer are in contact with the adjacent two lenses, which is beneficial to the assembly stability of the optical lens. The outer diameter of the first spacer P1, the second spacer P2, and the third spacer P3 is smaller than the inner diameter of the fourth spacer P4. The bearing area of the fourth lens E4 and the fourth spacer P4 is smaller than the bearing area of the fifth lens E5 and the fourth spacer P4, so as to facilitate the overall stable bearing of the optical lens.

[0097] The object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface.

[0098] In the present example, the effective focal length f of the optical lens is 3.78 mm.

[0099] Table 1 shows the basic structural parameter table of the optical lens of example one, wherein the units of the curvature radius and the thickness / distance are millimeters (mm).

[0100]

[0101] Table 1

[0102] In example one, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. The surface type of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0103]

[0104] wherein x is the sag of the aspherical surface at a height of h along the optical axis from the vertex of the aspherical surface, c is the paraxial curvature of the aspherical surface, c = 1 / R, i.e., the paraxial curvature c is the inverse of the radius of curvature R in Table 1 above, k is the conic constant, and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below provides the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical surfaces S1-S10 in Example 1.

[0105] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.0886E-03 -3.2859E-03 -1.3640E-03 -2.8364E-04 -1.0861E-04 -4.7285E-06 -2.1176E-05 1.2084E-07 -1.0423E-05 S2 -8.6043E-02 2.4348E-03 -4.7951E-03 -2.7836E-04 -4.5626E-04 -1.4550E-04 -5.8825E-05 -1.6703E-05 5.8773E-06 S3 -3.5597E-02 1.6848E-02 -5.0426E-03 -7.7764E-04 -1.0068E-03 -4.4227E-04 -1.8328E-04 -5.9111E-05 -7.1460E-06 S4 -2.2021E-02 1.2977E-02 1.2002E-03 8.2815E-04 1.5226E-04 -8.9630E-06 -3.3809E-05 -3.1739E-05 -1.1254E-05 S5 -1.0264E-01 4.8769E-04 4.1815E-03 2.1028E-03 5.4344E-04 4.1051E-05 -1.1415E-04 -6.8890E-05 -4.0711E-05 S6 -1.2998E-01 -5.6520E-03 4.1977E-03 1.7941E-03 8.7870E-04 3.3539E-04 1.7081E-04 5.3812E-05 3.2668E-05 S7 -1.1160E-01 -4.6644E-02 -5.3834E-03 -2.0646E-03 -5.1351E-04 -4.0547E-04 -1.4991E-04 -1.2518E-04 -2.6182E-05 S8 -9.4714E-02 -1.0467E-02 4.0816E-03 1.3085E-02 -4.2482E-03 1.9968E-03 -3.4085E-04 -4.8897E-05 1.5076E-04 S9 -1.1356E+00 3.6295E-01 -5.5610E-02 2.9920E-02 -2.4731E-02 7.8100E-03 -1.7662E-03 4.1692E-03 1.3557E-03 S10 -1.5139E+00 9.6701E-02 -6.0620E-02 4.0822E-02 9.0176E-03 1.6595E-02 4.4027E-03 2.2218E-03 2.2552E-04

[0106] Table 2

[0107] Figure 5 An axial chromatic aberration curve of the optical lens according to Example 1 is shown, which represents the deviation of convergent focal points of light rays of different wavelengths after passing through the optical lens. Figure 6 An astigmatism curve of the optical lens according to Example 1 is shown, which represents the meridional image curvature and sagittal image curvature. Figure 7 A distortion curve of the optical lens according to Example 1 is shown, which represents the distortion values corresponding to different field angles. Figure 8 A lateral chromatic aberration curve of the optical lens according to Example 1 is shown, which represents the deviation of different image heights of light rays on the image plane after passing through the optical lens.

[0108] According to Figures 5 to 8 It can be seen that the optical lens according to Example 1 can achieve good imaging quality.

[0109] Example 2

[0110] As Figures 9 to 15 shown, the optical lens according to Example 2 of the present application is described. Figure 9 A structural schematic diagram of the optical lens according to Example 2 in a first state is shown, Figure 10 A structural schematic diagram of the optical lens according to Example 2 in a second state is shown, Figure 11 A structural schematic diagram of the optical lens according to Example 2 in a third state is shown. For brevity, some similar descriptions as in Example 1 will be omitted.

[0111] As Figures 9 to 11As shown, the optical lens comprises, in sequence from the object side to the image side: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth lens E5. There is only one spacer between any two adjacent lenses among the first lens E1 to the fourth lens E4, which is in contact with the two adjacent lenses to ensure the stability of the optical lens assembly. There are two spacers between the fourth lens E4 and the fifth lens E5, the fourth spacer is in contact with the image side of the fourth lens E4, and the fourth auxiliary spacer P4b is in contact with the object side of the fifth lens E5. The outer diameter of the third spacer P3 is greater than the inner diameter of the object side of the fourth spacer P4 and less than the inner diameter of the fourth auxiliary spacer P4b, and the thickness of the fourth spacer P4 is the largest, so as to realize the step difference at the fourth lens E4 and the fifth lens E5.

[0112] The object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The object side S3 of the second lens is convex, and the image side S4 of the second lens is concave. The object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex. The object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is concave.

[0113] In this example, the effective focal length f of the optical lens is 3.85mm.

[0114] Table 3 shows the basic structure parameter table of the optical lens of Example Two, wherein the units of the curvature radius, thickness / distance are millimeters mm.

[0115]

[0116] Table 3

[0117] Table 4 gives the high-order term coefficients of each aspherical surface S1-S10 that can be used in Example Two, wherein each aspherical surface type can be defined by the formula 1 given in Example One above.

[0118]

[0119]

[0120] Table 4

[0121] Figure 12 The axial chromatic aberration curve of the optical lens of Example Two is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical lens. Figure 13 The astigmatism curve of the optical lens of Example Two is shown, which represents the meridional image surface curvature and sagittal image surface curvature.Figure 14 The distortion curve of the optical lens of Example Two is shown, which represents the distortion size value corresponding to different field angles. Figure 15 The magnification chromatic aberration curve of the optical lens of Example Two is shown, which represents the deviation of light rays on the imaging plane after passing through the optical lens at different image heights.

[0122] According to Figures 12 to 15 It can be seen that the optical lens given in Example Two can achieve good imaging quality.

[0123] Example Three

[0124] As Figures 16 to 22 shown, the optical lens of Example Three of the present application is described. Figure 16 The structural schematic diagram of the optical lens of Example Three in the first state is shown, Figure 17 The structural schematic diagram of the optical lens of Example Three in the second state is shown, Figure 18 The structural schematic diagram of the optical lens of Example Three in the third state is shown. For the sake of brevity, some similar descriptions as in Example One will be omitted.

[0125] As Figures 16 to 18 shown, the optical lens sequentially includes, from the object side to the image side: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a third auxiliary spacer P3b, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth lens E5. There is only one spacer between the adjacent two lenses among the first lens E1 to the third lens E3, which is in contact with the adjacent two lenses, to ensure the stability of the optical lens assembly. There are two spacers between the third lens E3 and the fourth lens E4, the third spacer P3 is in contact with the image side of the third lens E3, and the third auxiliary spacer P3b is in contact with the object side of the fourth lens E4. The outer diameter of the first spacer P1 and the second spacer P2 is greater than the inner diameter of the third spacer P3. The thickness of the third spacer P3 is greater than the thickness of the first spacer P1, the second spacer P3 and the third auxiliary spacer P3b. The inner diameter of the third auxiliary spacer P3b is greater than the inner diameter of the object side of the third spacer P3 and less than the inner diameter of the image side of the third spacer P3, which is conducive to the absorption of stray light by the third auxiliary spacer P3b. There are two spacers between the fourth lens E4 and the fifth lens E5, the fourth spacer P4 is in contact with the image side of the fourth lens E4, and the fourth auxiliary spacer P4b is in contact with the object side of the fifth lens E5. The outer diameter of the third auxiliary spacer P3b is greater than the inner diameter of the object side of the fourth spacer P4 and less than the inner diameter of the fourth auxiliary spacer P4b. The thickness of the fourth spacer P4 is greater than the thickness of the third spacer P3, so as to realize the step difference at the fourth lens E4 and the fifth lens E5.

[0126] The object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave.

[0127] In the present example, the effective focal length f of the optical lens is 3.78 mm.

[0128] Table 5 shows the basic structure parameter table of the optical lens of Example Three, wherein the units of the radius of curvature, thickness / distance are millimeter (mm).

[0129]

[0130] Table 5

[0131] Table 6 gives the high order term coefficients of the aspheric surfaces S1-S10 that can be used in Example Three, wherein each aspheric surface can be defined by the formula 1 given in Example One.

[0132]

[0133]

[0134] Table 6

[0135] Figure 19 The axial chromatic aberration curve of the optical lens of Example Three is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical lens. Figure 20 The astigmatism curve of the optical lens of Example Three is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 21 The distortion curve of the optical lens of Example Three is shown, which represents the distortion size values corresponding to different field angles. Figure 22 The rate of change of field curve of the optical lens of Example Three is shown, which represents the deviation of light rays on the imaging surface after passing through the optical lens.

[0136] According to Figures 19 to 22 It can be seen that the optical lens given in Example Three can achieve good imaging quality.

[0137] In summary, Examples One to Three respectively satisfy the relationships shown in Table 7.

[0138]

[0139] Table 7

[0140] Table 8 gives some parameters of the optical lens of Example 1 to Example 3.

[0141]

[0142]

[0143] Table 8

[0144] It should be noted that 1-1 in Table 7 and Table 8 represents the first state of the optical lens in Example 1, 1-2 represents the second state of the optical lens in Example 1, and 1-3 represents the third state of the optical lens in Example 1. 2-1 represents the first state of the optical lens in Example 2, 2-2 represents the second state of the optical lens in Example 2, and 2-3 represents the third state of the optical lens in Example 2. 3-1 represents the first state of the optical lens in Example 3, 3-2 represents the second state of the optical lens in Example 3, and 3-3 represents the third state of the optical lens in Example 3.

[0145] Table 9 gives the effective focal lengths of the first lens to the fifth lens of the optical lens of Example 1 to Example 3.

[0146] Parameter / Example 1 2 3 f1 (mm) 3.50 3.47 3.53 f2 (mm) -8.83 -9.20 -8.83 f3 (mm) 7.34 22.35 -19.36 f4 (mm) -2072.14 13.56 3.60 f5 (mm) -5.50 -5.02 -3.45 f (mm) 3.78 3.85 3.78 f / EPD 1.83 1.79 1.74

[0147] Table 9

[0148] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a stand-alone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0149] Obviously, the above-described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0150] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should be further understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0151] It should be noted that the terms "first", "second", and the like, used in the description and in the claims of the present application as well as above-mentioned figures are used to distinguish between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of data so designated is not meant to limit a given item described by such data to the same category as other data designated by the same designations, but instead is so designated only for convenience as a means of discriminating between the two series of items that refer to a same data.

[0152] The preferred embodiments of the application are described above in detail. The application, however, is not limited to the embodiments, but can vary and be modified within the spirit and scope of the application described in the appended claims. Accordingly, any and all modifications, variations or equivalent arrangements which do not depart from the spirit and essence of the application should be considered to be within the scope of the application.

Claims

1. An optical lens characterized in that, The optical lens comprises: a lens barrel; only five lenses with refractive power, a second lens from an object side to an image side has a central thickness on an optical axis of the optical lens smaller than central thicknesses of the remaining four lenses on the optical axis, and the central thickness CT2 of the second lens on the optical axis is smaller than 0.4 mm; a first spacer in contact with at least a portion of an image side surface of the first lens; a second spacer in contact with at least a portion of an image side surface of the second lens; a height L of the lens barrel, a focal length f of the optical lens, and a maximum field of view FOV of the optical lens satisfy: 1.3 < L / [f x tan (FOV / 2)] < 1.4; a focal length f2 of the second lens, a central thickness CT2 of the second lens on the optical axis, an air separation T23 between the second lens and a third lens on the optical axis, a maximum thickness CP2 of the second spacer, and a distance EP12 along the optical axis from an image side surface of the first spacer to an object side surface of the second spacer satisfy: -37 ≤ f2 / (CT2 + T23) + f2 / (EP12 + CP2) ≤ -30.22; the optical lens further comprises a fourth spacer in contact with an image side surface of a fourth lens, a radius of curvature R2 of the image side surface of the first lens, a radius of curvature R9 of an object side surface of a fifth lens, an inner diameter d1s of an object side surface of the first spacer, and an inner diameter d4s of an object side surface of the fourth spacer satisfy: 1.06 ≤ R2 / d1s + R9 / d4s ≤ 4.51; wherein the first lens has positive refractive power, the second lens has negative refractive power, and the fifth lens has negative refractive power; the object side surface of the first lens is convex, the image side surface of the first lens is concave; the object side surface of the second lens is convex, the image side surface of the second lens is concave; the object side surface of the third lens is convex; the image side surface of the fourth lens is convex; the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave.

2. The optical lens of claim 1, wherein, At least one of the first four lenses has positive refractive power, and the lens with positive refractive power satisfies: 0.9 < fi / dis < 10.0; wherein fi is an effective focal length of the i-th lens, dis is an inner diameter of an object side surface of the i-th spacer in contact with an image side surface of the i-th lens, and i takes a value from 1, 2, 3, and 4.

3. The optical lens of claim 1, wherein, The absolute value of the focal length of at least one of the first four lenses is less than 5, and the lenses having an absolute value of the focal length less than 5 and an image side surface having a spacer in contact therewith satisfy: 0.35≤Djs / R 2j-1 ≤2.13, where R 2j-1 is the radius of curvature of the object side surface of the jth lens, Djs is the outer diameter of the object side surface of the jth spacer in contact with the image side surface of the jth lens, and j takes values from 1, 2, 3, 4.

4. The optical lens of claim 1, wherein, The optical lens satisfies: 23.55 ≤ f1 / (CP1 + EP12) - f2 / (CP2 + EP12) ≤ 29.22, wherein f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, CP1 is a thickness of the first spacer, CP2 is a thickness of the second spacer, and EP12 is a distance on the optical axis from an image side surface of the first spacer to an object side surface of the second spacer.

5. The optical lens of claim 1, wherein, The first lens to the fourth lens satisfy: -6.65≤(R 2n +R 2n+1 ) / dns≤62.7, R 2n is the curvature radius of the image side surface of the nth lens, R 2n+1 is the curvature radius of the object side surface of the n+1th lens, dns is the inner diameter of the object side surface of the nth spacer in contact with the image side surface of the nth lens, and n is selected from 1, 2, 3, and 4.

6. The optical lens of claim 1, wherein, The optical lens further comprises a fourth spacer in contact with the image side of the fourth lens, a third spacer in contact with the image side of the third lens, a combined focal length f23 of the first lens and the second lens, a combined focal length f45 of the fourth lens and the fifth lens, a distance EP23 along the optical axis between the image side of the second spacer and the object side of the third spacer, a distance EP34 along the optical axis between the image side of the third spacer and the object side of the fourth spacer, and satisfy: -60.46≤f23 / EP23+f45 / EP34≤103.

4.

7. The optical lens of claim 1, wherein, The optical lens further comprises a fourth spacer in contact with the image side of the fourth lens, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, an outer diameter D2s of the object side of the second spacer, an outer diameter D4s of the object side of the fourth spacer, and satisfy: 8.5≤D2s / (CT2+CT3)+D4s / (CT4+CT5)≤10.

02.

8. The optical lens of claim 1, wherein, An entrance pupil diameter EPD of the optical lens, an inner diameter d1s of the object side of the first spacer, an effective focal length f of the optical lens, an effective focal length f1 of the first lens, and satisfy: 10.9≤(EPD+d1s) / (f-f1)≤16.

77.

9. The optical lens of any of claims 1 to 8, wherein, The optical power of the first lens and the optical power of the second lens are opposite in sign, and the absolute value of the effective focal length of the first lens is smaller than the absolute value of the effective focal length of the third lens.

10. The optical lens of claim 9, wherein, An effective focal length f1 of the first lens, an effective focal length f2 of the second lens, an effective focal length f3 of the third lens, and satisfy: 0.16≤|f1 / f3|<0.5, -0.4≤f1 / f2≤-0.

38.

11. The optical lens of claim 9, wherein, A radius of curvature R3 of the object side of the second lens, a radius of curvature R4 of the image side of the second lens, a radius of curvature R6 of the image side of the third lens, and satisfy: R3>R4, |R4|<|R6|.

12. The optical lens of any of claims 1 to 8, wherein, The absolute value of the radius of curvature of the first lens to the fourth lens is greater than the absolute value of the radius of curvature of the image side of the fifth lens.

13. The optical lens of claim 12, wherein, A radius of curvature R1 of the object side of the first lens, a radius of curvature R2 of the image side of the first lens, a radius of curvature R9 of the object side of the fifth lens, a radius of curvature R10 of the image side of the fifth lens, and satisfy: 0.58≤R1 / R9≤0.79, 5.69≤R2 / R10≤8.

14. An optical lens, characterized in that, Comprising: a lens barrel; only five lenses with optical power, the central thickness of the second lens on the optical axis of the optical lens is less than the central thickness of the remaining four lenses on the optical axis, and the central thickness CT2 of the second lens on the optical axis is less than 0.4 millimeters; a first spacer, the first spacer is in contact with at least part of the image side of the first lens; a second spacer in contact with at least a part of the image side surface of the second lens; a height L of the lens barrel, a focal length f of the optical lens, and a maximum field of view angle FOV of the optical lens satisfy: 1.3 < L / [f x tan (FOV / 2)] < 1.4; an effective focal length f1 of the first lens, an effective focal length f2 of the second lens, a thickness CP1 of the first spacer, a thickness CP2 of the second spacer, and a distance EP12 on the optical axis between the image side surface of the first spacer and the object side surface of the second spacer satisfy: 23.55 ≤ f1 / (CP1 + EP12) - f2 / (CP2 + EP12) ≤ 29.22; the optical lens further comprises a fourth spacer in contact with an image side surface of a fourth lens, a radius of curvature R2 of the image side surface of the first lens, a radius of curvature R9 of an object side surface of a fifth lens, an inner diameter d1s of the object side surface of the first spacer, and an inner diameter d4s of the object side surface of the fourth spacer satisfy: 1.06 ≤ R2 / d1s + R9 / d4s ≤ 4.51; wherein the first lens has positive refractive power, the second lens has negative refractive power, and the fifth lens has negative refractive power; the object side surface of the first lens is convex, the image side surface of the first lens is concave; the object side surface of the second lens is convex, the image side surface of the second lens is concave; the object side surface of the third lens is convex; the image side surface of the fourth lens is convex; the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave.

15. The optical lens of claim 14, wherein, at least one of the first four lenses has positive refractive power, and the lens with positive refractive power satisfies: 0.9 < fi / dis < 10.0; wherein fi is an effective focal length of the ith lens, dis is an inner diameter of an object side surface of an ith spacer in contact with an image side surface of the ith lens, and i is selected from 1, 2, 3, and 4.

16. The optical lens of claim 14, wherein, The absolute value of the focal length of at least one of the first four lenses is less than 5, and the lenses having an absolute value of the focal length less than 5 and an image side surface having a spacer in contact therewith satisfy: 0.35≤Djs / R 2j-1 ≤2.13, where R 2j-1 is the radius of curvature of the object side surface of the jth lens, Djs is the outer diameter of the object side surface of the jth spacer in contact with the image side surface of the jth lens, and j takes values from 1, 2, 3, 4.

17. The optical lens of claim 14, wherein, The first lens to the fourth lens satisfy: -6.65≤(R 2n +R 2n+1 ) / dns≤62.7, R 2n is the curvature radius of the image side surface of the nth lens, R 2n+1 is the curvature radius of the object side surface of the n+1th lens, dns is the inner diameter of the object side surface of the n-th spacer in contact with the image side surface of the n-th lens, n is selected from 1, 2, 3, 4.

18. The optical lens of claim 14, wherein, the optical lens further comprises a fourth spacer in contact with an image side surface of a fourth lens, a third spacer in contact with an image side surface of a third lens, a combined focal length f23 of the first lens and the second lens, a combined focal length f45 of the fourth lens and the fifth lens, a distance EP23 on the optical axis between the image side surface of the second spacer and the object side surface of the third spacer, and a distance EP34 on the optical axis between the image side surface of the third spacer and the object side surface of the fourth spacer satisfy: -60.46 ≤ f23 / EP23 + f45 / EP34 ≤ 103.

4.

19. The optical lens of claim 14, wherein, The optical lens further comprises a fourth spacer in contact with the image side face of the fourth lens, the second lens having a central thickness CT2 on the optical axis, the third lens having a central thickness CT3 on the optical axis, the fourth lens having a central thickness CT4 on the optical axis, the fifth lens having a central thickness CT5 on the optical axis, the object side face of the second spacer having an outer diameter D2s, the object side face of the fourth spacer having an outer diameter D4s, between them satisfying: 8.5≤D2s / (CT2+CT3)+D4s / (CT4+CT5)≤10.

02.

20. The optical lens of claim 14, wherein, The optical lens further comprises a fourth spacer in contact with the image side face of the fourth lens, the second lens having a central thickness CT2 on the optical axis, the third lens having a central thickness CT3 on the optical axis, the fourth lens having a central thickness CT4 on the optical axis, the fifth lens having a central thickness CT5 on the optical axis, the object side face of the second spacer having an outer diameter D2s, the object side face of the fourth spacer having an outer diameter D4s, between them satisfying: 8.5≤D2s / (CT2+CT3)+D4s / (CT4+CT5)≤10.

02.

21. The optical lens of any of claims 14 to 20, wherein, The optical lens further comprises a fourth spacer in contact with the image side face of the fourth lens, the second lens having a central thickness CT2 on the optical axis, the third lens having a central thickness CT3 on the optical axis, the fourth lens having a central thickness CT4 on the optical axis, the fifth lens having a central thickness CT5 on the optical axis, the object side face of the second spacer having an outer diameter D2s, the object side face of the fourth spacer having an outer diameter D4s, between them satisfying: 8.5≤D2s / (CT2+CT3)+D4s / (CT4+CT5)≤10.

02.

22. The optical lens of claim 21, wherein, The optical lens further comprises a fourth spacer in contact with the image side face of the fourth lens, the second lens having a central thickness CT2 on the optical axis, the third lens having a central thickness CT3 on the optical axis, the fourth lens having a central thickness CT4 on the optical axis, the fifth lens having a central thickness CT5 on the optical axis, the object side face of the second spacer having an outer diameter D2s, the object side face of the fourth spacer having an outer diameter D4s, between them satisfying: 8.5≤D2s / (CT2+CT3)+D4s / (CT4+CT5)≤10.

02.

23. The optical lens of claim 21, wherein, The optical lens further comprises a fourth spacer in contact with the image side face of the fourth lens, the second lens having a central thickness CT2 on the optical axis, the third lens having a central thickness CT3 on the optical axis, the fourth lens having a central thickness CT4 on the optical axis, the fifth lens having a central thickness CT5 on the optical axis, the object side face of the second spacer having an outer diameter D2s, the object side face of the fourth spacer having an outer diameter D4s, between them satisfying: 8.5≤D2s / (CT2+CT3)+D4s / (CT4+CT5)≤10.

02.

24. The optical lens of any of claims 14 to 20, wherein, The optical lens further comprises a fourth spacer in contact with the image side face of the fourth lens, the second lens having a central thickness CT2 on the optical axis, the third lens having a central thickness CT3 on the optical axis, the fourth lens having a central thickness CT4 on the optical axis, the fifth lens having a central thickness CT5 on the optical axis, the object side face of the second spacer having an outer diameter D2s, the object side face of the fourth spacer having an outer diameter D4s, between them satisfying: 8.5≤D2s / (CT2+CT3)+D4s / (CT4+CT5)≤10.

02.

25. The optical lens of claim 24, wherein, ​

Images