Long-focus optical lens and optical lens module

Abstract

The invention discloses a long-focus optical lens and an optical lens module, and belongs to the technical field of optical imaging, and the long-focus optical lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis, the second lens has positive focal power; the third lens has negative focal power; the fourth lens has positive focal power; and a turning prism element; the optical lens satisfies the following conditional expressions:-8.000 < = (R11 + R12) / (DT11 + DT12) < =-3.934; tTL / T23 is greater than or equal to 19.999 and less than or equal to 52.100. The first lens, the second lens, the third lens and the fourth lens are combined and configured, so that the relative illumination of the optical lens is improved, the field curvature is corrected, the distortion is reduced, and the imaging quality of the long-focus optical lens is improved; meanwhile, after the light path is turned, the requirements of shortening the total length and reducing the size of the optical lens module are met.

Description

Technical Field

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

[0002] With the popularization and development of smart phones, people's requirements for mobile phone lenses are getting higher and higher, and the functions and application scenarios of mobile phone lenses are becoming more and more diverse. Among them, a telephoto mobile phone lens capable of achieving long-distance shooting has gradually received extensive attention in the smart phone market. However, because shooting a clear long-distance view requires a long focal length, the telephoto optical lens has problems such as a long optical length and poor imaging quality.

[0003] Based on this, the present invention proposes a telephoto optical lens that takes into account shortening the total length, high pixel, and high imaging quality, so as to meet the improvement of the user's new experience. Summary of the Invention

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to provide a telephoto optical lens and an optical lens module that meet the requirements of shortening the total length, high pixel, and high imaging quality.

[0005] In a first aspect, an optical lens includes, in order from the object side to the image side along the optical axis:

[0006] A first lens with positive optical power; its object side surface is concave near the optical axis; its image side surface is convex near the optical axis;

[0007] A second lens with positive optical power; its object side surface is convex near the optical axis; its image side surface is concave near the optical axis;

[0008] A third lens with negative optical power, whose image side surface is concave near the optical axis;

[0009] A fourth lens with positive optical power, whose object side surface is convex near the optical axis; its image side surface is convex near the optical axis;

[0010] The first lens, the second lens, the third lens, and the fourth lens are all aspherical lenses;

[0011] The optical lens satisfies the following conditional expressions:

[0012] -8.000 ≤ (R11 + R12) / (DT11 + DT12) ≤ -3.934;

[0013] 19.999 ≤ TTL / T23 ≤ 52.100;

[0014] Wherein, R11 is the radius of curvature of the object side surface of the first lens; R12 is the radius of curvature of the image side surface of the first lens; DT11 is the maximum effective radius of the object side surface of the first lens; DT12 is the maximum effective radius of the image side surface of the first lens; TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens; T23 is the air separation distance between the second lens and the third lens on the optical axis.

[0015] Optionally, the optical lens satisfies the following conditional expressions:

[0016] 0.446 ≤ ∑ET / ImgH ≤ 0.657;

[0017] Wherein, ΣET is the total edge thickness of all lenses in the optical imaging system; ImgH is the maximum image height of the optical lens.

[0018] Optionally, the optical lens satisfies the following conditional expressions:

[0019] 3.009 ≤ f12 / (CT1 + CT2) ≤ 9.991;

[0020] Wherein, f12 is the combined focal length of the first lens and the second lens; CT1 is the central thickness of the first lens on the optical axis; CT2 is the central thickness of the second lens on the optical axis.

[0021] Optionally, the optical lens satisfies the following conditional expressions:

[0022] 1.227 ≤ BFL / f ≤ 1.358;

[0023] Wherein, BFL is the optical back focal length of the optical lens; f is the total effective focal length of the optical lens.

[0024] Optionally, the optical lens satisfies the following conditional expressions:

[0025] 3.313 ≤ ∑CT / (ET1 + ET2) ≤ 5.001;

[0026] Wherein, ΣCT is the total central thickness of all lenses in the optical imaging system; ET1 is the edge thickness of the first lens; ET2 is the edge thickness of the second lens.

[0027] Optionally, the optical lens satisfies the following conditional expressions:

[0028] -32.772 ≤ (SAG12 - SAG21) / T12 ≤ -15.000;

[0029] Wherein, SAG12 is the sagittal height SG value of the image side of the first lens corresponding to the maximum field of view angle of the optical lens; SAG21 is the sagittal height SG value of the object side of the second lens corresponding to the maximum field of view angle of the optical lens; T12 is the air separation distance between the first lens and the second lens on the optical axis.

[0030] Optionally, the optical lens satisfies the following conditional formula:

[0031] 25.068 ≤ (R41 - R42) / (SAG41 - SAG42) ≤ 34.047;

[0032] Wherein, R41 is the curvature radius of the object side of the fourth lens; R42 is the curvature radius of the image side of the fourth lens; SAG41 is the sagittal height SG value of the object side of the fourth lens corresponding to the maximum field of view angle of the optical lens; SAG42 is the sagittal height SG value of the image side of the fourth lens corresponding to the maximum field of view angle of the optical lens.

[0033] Optionally, the optical lens satisfies the following conditional formula:

[0034] 10.141 ≤ (DT22 + DT31) / Tan(Semi - Fov) ≤ 14.371;

[0035] Wherein, DT22 is the maximum effective radius of the image side of the second lens; DT31 is the maximum effective radius of the object side of the third lens; Semi - FOV is half of the maximum field of view angle of the optical lens.

[0036] In a second aspect, an optical lens module, characterized in that it includes an optical lens that takes into account shortening the total length, high pixel count, and high imaging quality.

[0037] An optical lens module, characterized in that it further includes a turning prism element, wherein the turning prism element is disposed between the fourth lens and the imaging surface before turning the optical path.

[0038] An optical lens module, characterized in that after the turning prism element turns the optical path, it includes an incident surface, a first reflecting surface, a total reflecting surface, a second reflecting surface, and an exit surface; light travels along the first optical axis direction through the first lens to the fourth lens, enters the turning prism element from the incident surface, after being reflected by the first reflecting surface, travels along the second optical axis direction and is incident on the total reflecting surface, after being reflected by the total reflecting surface, travels along the third optical axis direction and is incident on the second reflecting surface, after being reflected by the second reflecting surface, travels along the fourth optical axis direction and exits from the exit surface to the imaging surface; the imaging surface, the first lens to the fourth lens are all located on the same side of the turning prism element.

[0039] The beneficial effects of the invention are as follows:

[0040] By reasonably allocating the sum of the curvature radius of the object side of the first lens and the curvature radius of the image side of the first lens, and at the same time defining the sum of the maximum effective radius of the object side of the first lens and the maximum effective radius of the image side of the first lens, and on this basis, constraining the ratio of the two within a reasonable range, it is beneficial to ensure the light input amount of the first lens, improve the relative illumination of the optical lens, thereby improving the imaging quality of the telephoto optical lens; at the same time, it is beneficial to correct the field curvature of the optical lens, reduce distortion, and improve the imaging quality of the telephoto optical lens;

[0041] By reasonably allocating the ratio of the distance from the object side of the first lens to the imaging plane of the optical lens on the optical axis to the air separation distance of the second lens and the third lens on the optical axis within a reasonable range, it is beneficial to reasonably control the distance between the combined lenses before and after the aperture, correct the field curvature of the optical lens, better optimize the distortion of the optical lens, and improve the imaging quality.

[0042] By means of the three - reflection folded optical path after the turning prism element turns the optical path, and at the same time reasonably allocating parameters such as the curvature radius, thickness, material refractive index, and conic coefficient of each lens, it is beneficial to reduce the prism thickness and shorten the system length while ensuring the imaging quality of the telephoto optical lens, and is beneficial to meeting the requirements of shortening the total length and reducing the volume of the optical lens module.

[0043] Therefore, meeting the above - mentioned conditional expressions is beneficial to at least achieving one of shortening the total length, high pixel count, and high imaging quality. Brief Description of the Drawings

[0044] Figure 1 is a schematic structural diagram of the optical lens before the turning of the optical path in Embodiment 1 of the present application;

[0045] Figure 2 is a schematic structural diagram of the optical lens after the turning of the optical path in Embodiment 1 of the present application;

[0046] Figures 3 to 6 are respectively the spherical aberration curve graph, astigmatism curve graph, distortion graph, and lateral chromatic aberration graph of the optical lens in Embodiment 1 of the present application;

[0047] Figure 7 is a schematic structural diagram of the optical lens before the turning of the optical path in Embodiment 2 of the present application;

[0048] Figures 8 to 11 are respectively the spherical aberration curve graph, astigmatism curve graph, distortion graph, and lateral chromatic aberration graph of the optical lens in Embodiment 2 of the present application;

[0049] Figure 12 is a schematic structural diagram of the optical lens before the turning of the optical path in Embodiment 3 of the present application;

[0050] Figures 13 to 16 They are, in sequence, the spherical aberration curve graph, astigmatism curve graph, distortion graph, and longitudinal chromatic aberration graph of the optical lens according to the third embodiment of the present application;

[0051] Figure 17 It is a schematic structural diagram of the optical lens according to the fourth embodiment of the present application before the turning optical path;

[0052] Figures 18 to 21 They are, in sequence, the spherical aberration curve graph, astigmatism curve graph, distortion graph, and longitudinal chromatic aberration graph of the optical lens according to the fourth embodiment of the present application;

[0053] Figure 22 It is a schematic structural diagram of the optical lens according to the fifth embodiment of the present application before the turning optical path;

[0054] Figures 23 to 26 They are, in sequence, the spherical aberration curve graph, astigmatism curve graph, distortion graph, and longitudinal chromatic aberration graph of the optical lens according to the fifth embodiment of the present application.

[0055] In the figure: 100, optical lens; 11, first lens; 12, second lens; 13, third lens; 14, fourth lens; 15, turning prism element; 16, filter; 17, image sensor. Detailed implementation manners

[0056] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings.

[0057] It should be noted that, for the convenience of understanding and description, the present application defines the representation forms of relevant parameters of the optical lens. For example, TTL is used to represent the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis; ImgH represents the maximum image height of the optical lens. The letters used in similar definitions are only illustrative, and of course, they can also be represented in other forms, and the present application makes no limitations.

[0058] It should also be noted that the units of the parameters involving ratios in the following relationships are kept consistent. For example, the unit of the numerator is millimeter (mm), and the unit of the denominator is also millimeter (mm).

[0059] It should also be noted that the positive and negative values of the radius of curvature represent whether the optical surface bulges towards the object side or the image side. When the optical surface (including the object side surface or the image side surface) bulges towards the object side, the radius of curvature of the optical surface is positive; when the optical surface (including the object side surface or the image side surface) bulges towards the image side, it is equivalent to the optical surface being concave towards the object side surface, and the radius of curvature of the optical surface is negative.

[0060] It should also be noted that the shape of the lens and the concavity and convexity of the object side and the image side in the drawings are only schematic and do not impose any limitation on the embodiments of the present application. In the present application, the material of the lens can be resin, plastic, or glass. The lens includes a spherical lens and an aspherical lens. The lens can be a fixed focal length lens, a zoom lens, a standard lens, a short focal length lens, or a long focal length lens.

[0061] As Figure 1 shown, the optical lens 100 of the embodiment of the present application includes 4 lenses. For the convenience of description, it is defined that the left side of the optical lens 100 is the scene side (hereinafter also referred to as the object side), and the surface of the lens facing the object side can be called the object side surface, and the object side surface can also be understood as the surface of the lens close to the object side. The right side of the optical lens 100 is the image side (hereinafter also referred to as the image side), and the surface of the lens facing the image side can be called the image side surface, and the image side surface can also be understood as the surface of the lens close to the image side. From the object side to the image side, the optical lens 100 of the embodiment of the present application successively includes from the object side to the image side: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a turning prism element 15; a diaphragm Stop can be provided between the second lens 12 and the third lens 13. An image sensor 17 such as a CCD or a CMOS can also be provided behind the turning prism element 15. A filter 16 such as a flat infrared cut-off filter can also be provided between the turning prism element 15 and the image sensor 17. The optical lens 100 will be described in detail below.

[0062] Refer to Figure 1 the schematic structural diagram of the optical lens before the turning optical path in the first embodiment of the present application shown, Figure 2 the schematic structural diagram of the optical lens after the turning optical path in the first embodiment of the present application shown, Figure 1 And Figure 2 the dotted line in is used to represent the optical axis of the lens.

[0063] The optical lens 100 of the embodiment of the present application successively includes from the object side to the image side:

[0064] a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a turning prism element 15.

[0065] It should be understood that the above "each lens of the optical lens" refers to the lens that makes up the optical lens, which are the first lens, the second lens, the third lens, the fourth lens 14, and the turning prism element 15 in the embodiment of the present application.

[0066] Optionally, in the schematic structural diagram of the optical lens before the turning optical path in the embodiment of the present application,

[0067] The first lens 11 may have a positive focal power. The object side surface S1 of the first lens 11 is concave near the optical axis; the image side surface S2 of the first lens 11 is convex near the optical axis;

[0068] The second lens 12 may have a positive focal power. The object side surface S3 of the second lens 12 is convex near the optical axis, and the image side surface S4 of the second lens 12 is concave near the optical axis;

[0069] The third lens 13 may have a negative focal power. The object side surface S5 of the third lens 13 is convex near the optical axis, and the image side surface S6 of the third lens 13 is concave near the optical axis;

[0070] The fourth lens 14 may have a positive focal power. The object side surface S7 of the fourth lens 14 is convex near the optical axis, and the image side surface S8 of the fourth lens 14 is convex near the optical axis;

[0071] Before the turning prism element 15 turns the optical path, it includes an incident surface S9 and an exit surface S10.

[0072] Optionally, in the schematic structural diagram of the optical lens after turning the optical path in the embodiment of the present application,

[0073] The first lens 11 may have a positive focal power. The object side surface S1 of the first lens 11 is concave near the optical axis; the image side surface S2 of the first lens 11 is convex near the optical axis;

[0074] The second lens 12 may have a positive focal power. The object side surface S3 of the second lens 12 is convex near the optical axis, and the image side surface S4 of the second lens 12 is concave near the optical axis;

[0075] The third lens 13 may have a negative focal power. The object side surface S5 of the third lens 13 is convex near the optical axis, and the image side surface S6 of the third lens 13 is concave near the optical axis;

[0076] The fourth lens 14 may have a positive focal power. The object side surface S7 of the fourth lens 14 is convex near the optical axis, and the image side surface S8 of the fourth lens 14 is convex near the optical axis;

[0077] After the turning prism element 15 turns the optical path, it includes an incident surface S9, a first reflecting surface P1, a total reflecting surface P2, a second reflecting surface P3, and an exit surface S10.

[0078] The optical lens 100 satisfies the following relationship:

[0079] -8.000 ≤ (R11 + R12) / (DT11 + DT12) ≤ -3.934;

[0080] 19.999 ≤ TTL / T23 ≤ 52.100;

[0081] (R11 + R12) / (DT11 + DT12) can be -8.000, -5.988, -5.831, -4.810, -3.934; by reasonably distributing the sum of the curvature radius of the object side of the first lens and the curvature radius of the image side of the first lens, and at the same time limiting the sum of the maximum effective radius of the object side of the first lens and the maximum effective radius of the image side of the first lens, and on this basis, constraining the ratio between the two within a reasonable range, it is beneficial to ensure the light input amount of the first lens, improve the relative illumination of the optical lens, thereby improving the imaging quality of the telephoto optical lens; at the same time, it is beneficial to correct the field curvature of the optical lens, reduce distortion, and improve the imaging quality of the telephoto optical lens.

[0082] TTL / T23 can be 19.999, 24.349, 37.833, 50.440, 52.100; by reasonably distributing the ratio of the distance from the object side of the first lens to the imaging plane of the optical lens on the optical axis to the air interval distance of the second lens and the third lens on the optical axis within a reasonable range, it is beneficial to reasonably control the distance between the combined lenses before and after the aperture, correct the field curvature of the optical lens, better optimize the distortion of the optical lens, and improve the imaging quality.

[0083] Therefore, satisfying the above two conditional expressions is beneficial to at least achieve one of shortening the total length, high pixel, and high imaging quality.

[0084] In some implementation manners of the first aspect, the optical lens satisfies: 0.446 ≤ ΣET / ImgH ≤ 0.657; ΣET / ImgH can be 0.446, 0.515, 0.626, 0.649, 0.657; by reasonably distributing the ratio of the sum of the edge thicknesses of all lenses in the optical imaging system to the maximum image height of the optical lens within a reasonable range, it is beneficial to reduce the processing difficulty in the structure between the first lens and the fourth lens, make the production manufacturing and assembly have higher stability, and improve the production yield of the optical lens.

[0085] In some implementation manners of the first aspect, the optical lens satisfies: 3.009 ≤ f12 / (CT1 + CT2) ≤ 9.991;

[0086] f12 / (CT1 + CT2) can be 3.009, 3.420, 3.692, 5.080, 9.991; by reasonably distributing the sum of the central thickness of the first lens on the optical axis and the central thickness of the second lens on the optical axis, and on this basis, constraining the ratio of the combined focal length of the first lens and the second lens to it within a reasonable range, it is beneficial to correct the system chromatic aberration of the optical lens, reduce the spherical aberration, coma, and astigmatism generated by the system, and improve the imaging quality of the optical lens.

[0087] In some implementations of the first aspect, the optical lens satisfies: 1.227 ≤ BFL / f ≤ 1.358; BFL / f can be 1.227, 1.293, 1.301, 1.356, 1.358; by reasonably allocating the ratio of the optical back focal length of the optical lens to the total effective focal length of the optical lens within a reasonable range, it is beneficial to match a more suitable image plane while controlling the optical back focal length and the total effective focal length of the optical lens and satisfying a larger depth of field range, improving the matching degree of the image sensor, and thus improving the imaging quality of the optical lens.

[0088] In some implementations of the first aspect, the optical lens satisfies: 3.313 ≤ ΣCT / (ET1 + ET2) ≤ 5.001; ΣCT / (ET1 + ET2) can be 3.313, 3.428, 3.778, 5.000, 5.001; by reasonably allocating the sum of the edge thickness of the first lens and the edge thickness of the second lens, and on this basis, constraining the ratio of the total central thickness of all lenses in the optical imaging system to it within a reasonable range, it is beneficial to correct the system chromatic aberration of the optical lens, improve astigmatism and distortion, improve the resolution of the optical lens, and improve the imaging quality.

[0089] In some implementations of the first aspect, the optical lens satisfies: -32.772 ≤ (SAG12 - SAG21) / T12 ≤ -15.000; (SAG12 - SAG21) / T12 can be -32.772, -28.851, -15.244, -15.001, -15.000; by reasonably allocating the difference between the sagittal height SG value of the image side of the first lens corresponding to the maximum field of view angle of the optical lens and the sagittal height SG value of the object side of the second lens corresponding to the maximum field of view angle of the optical lens, and on this basis, constraining the ratio of it to the air separation distance between the first lens and the second lens on the optical axis within a reasonable range, it is beneficial to filter the stray light generated between the first lens and the second lens, effectively reduce the stray light and ghost images generated by the system, and thus improve the imaging quality of the telephoto optical lens.

[0090] In certain implementations of the first aspect, the optical lens satisfies: 25.068 ≤ (R41 - R42) / (SAG41 - SAG42) ≤ 34.047; (R41 - R42) / (SAG41 - SAG42) can be 25.068, 30.288, 30.325, 31.991, 34.047; by reasonably allocating the difference between the curvature radius of the object side surface of the fourth lens and the curvature radius of the image side surface of the fourth lens, and at the same time defining the sum of the sag SG value of the object side surface of the fourth lens corresponding to the maximum field of view angle of the optical lens and the sag SG value of the image side surface of the fourth lens corresponding to the maximum field of view angle of the optical lens, and on this basis restricting the ratio of the two within a reasonable range, the distortion of the optical lens can be better optimized by controlling the bending degrees of the object side and the image side of the fourth lens, the aberration of the optical lens can be improved, and the imaging quality of the optical lens can be further improved.

[0091] In certain implementations of the first aspect, the optical lens satisfies: 10.141 ≤ (DT22 + DT31) / Tan(Semi-Fov) ≤ 14.371; (DT22 + DT31) / Tan(Semi-Fov) can be 10.141, 11.463, 11.463, 11.689, 14.371; by reasonably allocating the sum of the maximum effective radius of the image side surface of the second lens and the maximum effective radius of the object side surface of the third lens, and on this basis restricting the ratio of it to the tangent value of half of the maximum field of view angle of the optical lens within a reasonable range, it is beneficial to filter the stray light generated between the second lens and the third lens, reduce the stray light and ghost images of the optical lens, thereby improving the imaging quality of the optical lens; at the same time, it is beneficial to ensure the light transmission amount between the second lens and the third lens, improve the relative illuminance of the optical lens, and further improve the imaging quality of the telephoto optical lens.

[0092] In the second aspect, an optical lens module is provided, which includes the optical lens in any possible implementation of the first aspect, and may further include an image sensor, an analog-to-digital converter, an image processor, a memory, etc., to implement the imaging function of the optical lens.

[0093] An optical lens module, characterized in that it further includes a turning prism element, wherein the turning prism element is disposed between the fourth lens and the imaging surface before turning the optical path.

[0094] An optical lens module, characterized in that after the turning prism element turns the optical path, it includes an incident surface, a first reflection surface, a total reflection surface, a second reflection surface and an exit surface; light travels along the first optical axis direction through the first lens to the fourth lens, enters the turning prism element from the incident surface, is reflected by the first reflection surface, and then travels along the second optical axis direction to the total reflection surface, is reflected by the total reflection surface, and then travels along the third optical axis direction to the second reflection surface, is reflected by the second reflection surface, and then travels along the fourth optical axis direction to exit from the exit surface to the imaging surface; the imaging surface, the first lens to the fourth lens are all located on the same side of the turning prism element. By folding the optical path through three reflections after the turning prism element turns the optical path, and reasonably distributing parameters such as the curvature radius, thickness, material refractive index and conic coefficient of each lens, it is beneficial to reduce the prism thickness and shorten the system length while ensuring the imaging quality of the telephoto optical lens, and is beneficial to meeting the requirements of shortening the total length and reducing the volume of the optical lens module.

[0095] Next, some specific but non-limiting examples of the embodiments of the present application will be described in Figures 1 to 26 more detail.

[0096] It should be noted that the embodiments of the present application do not specifically limit the materials of the respective lenses of the optical lens 100.

[0097] Embodiment 1

[0098] The optical lens 100 of an embodiment of the present application sequentially includes, from the object side to the image side: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a turning prism element 15, as Figure 1 shown.

[0099] For convenience of description, in the following embodiments, Stop represents the surface of the diaphragm, S1 represents the object side surface of the first lens 11, S2 represents the image side surface of the first lens 11, S3 represents the object side surface of the second lens 12, S4 represents the image side surface of the second lens 12, S5 represents the object side surface of the third lens 13, S6 represents the image side surface of the third lens 13, S7 represents the object side surface of the fourth lens 14, S8 represents the image side surface of the fourth lens 14, S9 represents the incident surface of the turning prism element 15, S10 represents the exit surface of the turning prism element 15, S11 represents the object side surface of the filter, S12 represents the image side surface of the filter, and S13 represents the imaging surface. The first lens 11 has a positive optical power. The object side surface S1 of the first lens 11 is concave near the optical axis; the image side surface S2 of the first lens 11 is convex near the optical axis; the second lens 12 has a positive optical power. The object side surface S3 of the second lens 12 is convex near the optical axis, and the image side surface S4 of the second lens 12 can be concave near the optical axis; the third lens 13 has a negative optical power. The object side surface S5 of the third lens 13 is convex near the optical axis, and the image side surface S6 of the third lens 13 is concave near the optical axis; the fourth lens 14 has a positive optical power. The object side surface S7 of the fourth lens 14 is convex near the optical axis, and the image side surface S8 of the fourth lens 14 is convex near the optical axis; before the turning prism element 15 turns the optical path, it includes the incident surface S9 and the exit surface S10. After turning the optical path, it can include the incident surface S9, the first reflection surface P1, the total reflection surface P2, the second reflection surface P3, and the exit surface S10.

[0100] Let TTL represent the overall optical length of the optical lens 100, ImgH represent the maximum image height of the optical lens 100, and EFL represent the effective focal length of the optical lens 100. Let Ai represent the correction coefficient of the i-th - n-th order of the aspherical surface, where i = 4, 6, 8, 10, 12, 14, 16, and let k represent the conic coefficient.

[0101] According to the above relationships, Table 1 shows the effective focal length EFL, the maximum field of view Fov, the overall optical length TTL, the aperture F value F.No, the surface type, the radius of curvature, the thickness, the refractive index of the material, and the conic coefficient of the optical lens 100 in the first embodiment. Among them, the units of the radius of curvature and the thickness are both millimeters (mm), as shown in Table 1:

[0102] Table 1

[0103]

[0104] Table 2 shows the aspherical coefficients of the optical lens 100 in the first embodiment of the present application, as shown in Table 2:

[0105] Table 2

[0106] Surface number A4 A6 A8 A10 A12 A14 A16 S1 6.020E-03 -4.756E-03 1.872E-03 -4.510E-04 7.006E-05 -6.467E-06 2.729E-07 S2 -1.604E-02 4.008E-03 -1.870E-04 -1.802E-04 5.427E-05 -6.764E-06 3.356E-07 S3 -1.575E-02 1.470E-03 5.676E-04 -9.520E-05 -5.707E-05 7.044E-06 4.860E-07 S4 -1.456E-02 1.435E-03 -7.269E-04 1.353E-04 -6.250E-05 4.208E-06 -3.767E-07 S5 -3.874E-02 2.178E-02 -6.804E-03 1.199E-03 -7.176E-05 -1.083E-05 1.912E-06 S6 -2.966E-02 -1.228E-02 1.876E-02 -1.003E-02 2.756E-03 -3.189E-04 3.760E-06 S7 3.276E-02 -3.927E-02 2.206E-02 -8.815E-03 2.352E-03 -2.806E-04 2.654E-06 S8 -2.979E-02 1.626E-02 -1.027E-02 4.036E-03 -7.149E-04 2.957E-05 5.892E-06

[0107] Among them, the aspherical surfaces of the respective lenses of the imaging optical lens 100 satisfy:

[0108]

[0109] Among them, x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is along the optical axis direction at a position with a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / r (that is, the paraxial curvature c is the reciprocal of the radius of curvature r in Table 1 above); k is the conic coefficient (given in Table 1 above); Ai is the correction coefficient of the i-th to (i - n)-th order of the aspherical surface. The higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of each lens surface S1 - S8 are shown in Table 2.

[0110] It should be understood that the aspherical surfaces of the respective lenses in the optical lens 100 may use the aspherical surfaces shown in the above aspherical formula, or may use other aspherical formulas, which are not limited in this application.

[0111] The design data of the optical lens 100 in the first embodiment of this application are given above. The effective focal length EFL is 10.962 mm, the maximum field of view angle Fov is 33.803 degrees, the overall optical length TTL is 16.419 mm, and the aperture F value F.No is 2.909.

[0112] In an embodiment provided by this application, (R11 + R12) / (DT11 + DT12) = -4.810.

[0113] In an embodiment provided by this application, TTL / T23 = 19.999.

[0114] In an embodiment provided by this application, ΣET / ImgH = 0.515.

[0115] In an embodiment provided by this application, f12 / (CT1 + CT2) = 9.991.

[0116] In an embodiment provided by this application, BFL / f = 1.356.

[0117] In an embodiment provided by this application, ΣCT / (ET1 + ET2) = 5.001.

[0118] In an embodiment provided by this application, (SAG12 - SAG21) / T12 = -15.001.

[0119] In an embodiment provided by this application, (R41 - R42) / (SAG41 - SAG42) = 25.068.

[0120] In an embodiment provided by the present application, (DT22 + DT31) / Tan(Semi-Fov) = 11.689.

[0121] Figures 3 to 6 Describes the optical performance of the optical lens 100 designed in the lens combination manner of Embodiment 1.

[0122] In Embodiment 1, the optical lens meets the requirements of shortening the overall length, high pixel, and high imaging quality.

[0123] Embodiment 2

[0124] The optical lens 100 of an embodiment of the present application sequentially includes, from the object side to the image side: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a turning prism element 15, as Figure 7 shown.

[0125] For convenience of description, in the following embodiments, Stop represents the surface of the aperture stop, S1 represents the object side surface of the first lens 11, S2 represents the image side surface of the first lens 11, S3 represents the object side surface of the second lens 12, S4 represents the image side surface of the second lens 12, S5 represents the object side surface of the third lens 13, S6 represents the image side surface of the third lens 13, S7 represents the object side surface of the fourth lens 14, S8 represents the image side surface of the fourth lens 14, S9 represents the incident surface of the turning prism element 15, S10 represents the exit surface of the turning prism element 15, S11 represents the object side surface of the filter, S12 represents the image side surface of the filter, and S13 represents the imaging surface. The first lens 11 has a positive optical power, and the object side surface S1 of the first lens 11 is concave near the optical axis; the image side surface S2 of the first lens 11 is convex near the optical axis; the second lens 12 has a positive optical power, the object side surface S3 of the second lens 12 is convex near the optical axis, and the image side surface S4 of the second lens 12 can be concave near the optical axis; the third lens 13 has a negative optical power, the object side surface S5 of the third lens 13 is concave near the optical axis, and the image side surface S6 of the third lens 13 is concave near the optical axis; the fourth lens 14 has a positive optical power, the object side surface S7 of the fourth lens 14 is convex near the optical axis, and the image side surface S8 of the fourth lens 14 is convex near the optical axis; before the turning prism element 15 turns the optical path, it includes an incident surface S9 and an exit surface S10, and after turning the optical path, it can include an incident surface S9, a first reflecting surface P1, a total reflecting surface P2, a second reflecting surface P3, and an exit surface S10.

[0126] Let TTL represent the overall optical length of the optical lens 100, ImgH represent the maximum image height of the optical lens 100, and EFL represent the effective focal length of the optical lens 100. Let Ai represent the correction coefficient of the i-th - n-th order of the aspherical surface, i = 4, 6, 8, 10, 12, 14, 16, and k represent the conic coefficient.

[0127] According to the relational expressions above, Table 3 shows the effective focal length EFL, maximum field of view Fov, total optical length TTL, F-number F.No, surface type, radius of curvature, thickness, refractive index of the material, and conic constant of the optical lens 100 in the second embodiment. Among them, the units of the radius of curvature and the thickness are both millimeters (mm), as shown in Table 3:

[0128] Table 3

[0129]

[0130] Table 4 shows the aspheric coefficients of the optical lens 100 in the second embodiment of the present application, as shown in Table 4:

[0131] Table 4

[0132] Surface number A4 A6 A8 A10 A12 A14 A16 S1 6.504E-03 -4.766E-03 1.871E-03 -4.493E-04 7.028E-05 -6.483E-06 2.616E-07 S2 -1.528E-02 4.142E-03 -1.790E-04 -1.778E-04 5.440E-05 -6.900E-06 3.360E-07 S3 -1.592E-02 2.133E-03 3.929E-04 -8.593E-05 -4.530E-05 9.709E-06 -4.898E-07 S4 -6.991E-03 1.554E-03 -3.818E-04 1.471E-04 -6.872E-05 6.688E-07 2.838E-07 S5 -3.120E-02 2.239E-02 -7.066E-03 1.195E-03 -6.014E-05 -9.946E-06 9.697E-07 S6 -3.052E-02 -1.342E-02 1.882E-02 -1.001E-02 2.769E-03 -3.126E-04 2.074E-06 S7 3.018E-02 -3.978E-02 2.229E-02 -8.718E-03 2.359E-03 -2.808E-04 3.818E-06 S8 -3.157E-02 1.797E-02 -1.022E-02 3.981E-03 -7.221E-04 3.430E-05 7.972E-06

[0133] Among them, the aspheric surfaces of the respective lenses of the imaging optical lens 100 satisfy:

[0134]

[0135] Among them, x is the sagitta, the distance from the vertex of the aspheric surface when the aspheric surface is along the optical axis at a position with a height of h; c is the paraxial curvature of the aspheric surface, c = 1 / r (that is, the paraxial curvature c is the reciprocal of the radius of curvature r in Table 3 above); k is the conic constant (given in Table 3 above); Ai is the correction coefficient of the i-th to (i - n)-th order of the aspheric surface. The higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 of each lens surface S1 - S8 are shown in Table 4.

[0136] It should be understood that the aspheric surfaces of the respective lenses in the optical lens 100 may use the aspheric surfaces shown by the above aspheric formula, or may use other aspheric formulas, which are not limited in the present application.

[0137] The design data of the optical lens 100 in the second embodiment of the present application are given above. The effective focal length EFL is 13.499 mm, the maximum field of view Fov is 27.233 degrees, the total optical length TTL is 16.387 mm, and the F-number F.No is 3.439.

[0138] In an embodiment provided by the present application, (R11 + R12) / (DT11 + DT12) = -5.831.

[0139] In an embodiment provided by the present application, TTL / T23 = 50.440.

[0140] In an embodiment provided by the present application, ΣET / ImgH = 0.657.

[0141] In an embodiment provided by the present application, f12 / (CT1 + CT2) = 3.692.

[0142] In an embodiment provided by the present application, BFL / f = 1.227.

[0143] In an embodiment provided by the present application, ΣCT / (ET1 + ET2) = 3.428.

[0144] In an embodiment provided by the present application, (SAG12 - SAG21) / T12 = -28.851.

[0145] In an embodiment provided by the present application, (R41 - R42) / (SAG41 - SAG42) = 34.047.

[0146] In an embodiment provided by the present application, (DT22 + DT31) / Tan(Semi - Fov) = 14.371.

[0147] Figures 8 to 11 The optical performance of the optical lens 100 designed in the lens combination manner of Embodiment 2 is described.

[0148] In Embodiment 2, the optical lens meets the requirements of shortening the overall length, high pixel, and high imaging quality.

[0149] Embodiment 3

[0150] The optical lens 100 of an embodiment of the present application sequentially includes, from the object side to the image side: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a turning prism element 15, as Figure 12 shown.

[0151] For convenience of description, in the following embodiments, Stop represents the surface of the diaphragm, S1 represents the object side surface of the first lens 11, S2 represents the image side surface of the first lens 11, S3 represents the object side surface of the second lens 12, S4 represents the image side surface of the second lens 12, S5 represents the object side surface of the third lens 13, S6 represents the image side surface of the third lens 13, S7 represents the object side surface of the fourth lens 14, S8 represents the image side surface of the fourth lens 14, S9 represents the incident surface of the turning prism element 15, S10 represents the exit surface of the turning prism element 15, S11 represents the object side surface of the filter, S12 represents the image side surface of the filter, and S13 represents the imaging surface. The first lens 11 has a positive optical power. The object side surface S1 of the first lens 11 is concave near the optical axis; the image side surface S2 of the first lens 11 is convex near the optical axis; the second lens 12 has a positive optical power. The object side surface S3 of the second lens 12 is convex near the optical axis, and the image side surface S4 of the second lens 12 can be concave near the optical axis; the third lens 13 has a negative optical power. The object side surface S5 of the third lens 13 is concave near the optical axis, and the image side surface S6 of the third lens 13 is concave near the optical axis; the fourth lens 14 has a positive optical power. The object side surface S7 of the fourth lens 14 is convex near the optical axis, and the image side surface S8 of the fourth lens 14 is convex near the optical axis; before the turning prism element 15 turns the optical path, it includes the incident surface S9 and the exit surface S10. After turning the optical path, it can include the incident surface S9, the first reflecting surface P1, the total reflecting surface P2, the second reflecting surface P3, and the exit surface S10.

[0152] Let TTL represent the overall optical length of the optical lens 100, ImgH represent the maximum image height of the optical lens 100, and EFL represent the effective focal length of the optical lens 100. Let Ai represent the correction coefficient of the i-th to (i - n)-th order of the aspherical surface, where i = 4, 6, 8, 10, 12, 14, 16, and let k represent the conic coefficient.

[0153] According to the above relationships, Table 5 shows the effective focal length EFL, the maximum field of view Fov, the overall optical length TTL, the aperture F value F.No, the surface type, the radius of curvature, the thickness, the refractive index of the material, and the conic coefficient of the optical lens 100 in Embodiment 3. Among them, the units of the radius of curvature and the thickness are both millimeters (mm), as shown in Table 5:

[0154] Table 5

[0155]

[0156] Table 6 shows the aspherical coefficients of the optical lens 100 in Embodiment 3 of the present application, as shown in Table 6:

[0157] Table 6

[0158]

[0159]

[0160] Among them, the aspherical surfaces of the respective lenses of the imaging optical lens 100 satisfy:

[0161]

[0162] Among them, x is the sagitta of the distance from the vertex of the aspherical surface when the aspherical surface is in the direction of the optical axis at a position with a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / r (that is, the paraxial curvature c is the reciprocal of the radius of curvature r in Table 5 above); k is the conic coefficient (given in Table 5 above); Ai is the correction coefficient of the i-th to (i - n)-th order of the aspherical surface. The higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of each lens surface S1 - S8 are shown in Table 6.

[0163] It should be understood that the aspherical surfaces of the respective lenses in the optical lens 100 can use the aspherical surfaces shown in the above aspherical formula, or other aspherical formulas, which are not limited in this application.

[0164] The design data of the optical lens 100 in the third embodiment of the present application are given above. The effective focal length EFL is 9.916 mm, the maximum field of view angle Fov is 36.476 degrees, the total optical length TTL is 16.095 mm, and the aperture F value F.No is 2.649.

[0165] In an embodiment provided by the present application, (R11 + R12) / (DT11 + DT12) = -5.988.

[0166] In an embodiment provided by the present application, TTL / T23 = 24.349.

[0167] In an embodiment provided by the present application, ΣET / ImgH = 0.446.

[0168] In an embodiment provided by the present application, f12 / (CT1 + CT2) = 5.080.

[0169] In an embodiment provided by the present application, BFL / f = 1.358.

[0170] In an embodiment provided by the present application, ΣCT / (ET1 + ET2) = 5.000.

[0171] In an embodiment provided by the present application, (SAG12 - SAG21) / T12 = -15.244.

[0172] In an embodiment provided by the present application, (R41 - R42) / (SAG41 - SAG42) = 30.325.

[0173] In an embodiment provided by the present application, (DT22 + DT31) / Tan(Semi - Fov) = 10.141.

[0174] Figures 13 to 16 The optical performance of the optical lens 100 designed in the lens combination manner of Embodiment 3 is described.

[0175] In Embodiment 3, the optical lens meets the requirements of shortening the overall length, high pixel, and high imaging quality.

[0176] Embodiment 4

[0177] The optical lens 100 of an embodiment of the present application sequentially includes, from the object side to the image side: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a turning prism element 15, as Figure 17 shown.

[0178] For the convenience of description, in the following embodiments, Stop represents the surface of the aperture stop, S1 represents the object side surface of the first lens 11, S2 represents the image side surface of the first lens 11, S3 represents the object side surface of the second lens 12, S4 represents the image side surface of the second lens 12, S5 represents the object side surface of the third lens 13, S6 represents the image side surface of the third lens 13, S7 represents the object side surface of the fourth lens 14, S8 represents the image side surface of the fourth lens 14, S9 represents the incident surface of the turning prism element 15, S10 represents the exit surface of the turning prism element 15, S11 represents the object side surface of the filter, S12 represents the image side surface of the filter, and S13 represents the imaging surface. The first lens 11 has a positive optical power, and the object side surface S1 of the first lens 11 is concave near the optical axis; the image side surface S2 of the first lens 11 is convex near the optical axis; the second lens 12 has a positive optical power, the object side surface S3 of the second lens 12 is convex near the optical axis, and the image side surface S4 of the second lens 12 can be concave near the optical axis; the third lens 13 has a negative optical power, the object side surface S5 of the third lens 13 is concave near the optical axis, and the image side surface S6 of the third lens 13 is concave near the optical axis; the fourth lens 14 has a positive optical power, the object side surface S7 of the fourth lens 14 is convex near the optical axis, and the image side surface S8 of the fourth lens 14 is convex near the optical axis; before the turning prism element 15 turns the optical path, it includes an incident surface S9 and an exit surface S10, and after turning the optical path, it can include an incident surface S9, a first reflecting surface P1, a total reflecting surface P2, a second reflecting surface P3, and an exit surface S10.

[0179] Let TTL represent the overall optical length of the optical lens 100, ImgH represent the maximum image height of the optical lens 100, and EFL represent the effective focal length of the optical lens 100. Let Ai represent the correction coefficient of the i - nth order of the aspheric surface, i = 4, 6, 8, 10, 12, 14, 16, and k represent the conic coefficient.

[0180] According to the relational expressions above, Table 7 shows the effective focal length EFL, maximum field of view Fov, total optical length TTL, F-number F.No, surface type, radius of curvature, thickness, refractive index of the material, and conic constant of the optical lens 100 in Embodiment 4. Among them, the units of the radius of curvature and the thickness are both millimeters (mm), as shown in Table 7:

[0181] Table 7

[0182]

[0183] Table 8 shows the aspheric coefficients of the optical lens 100 in Embodiment 4 of the present application, as shown in Table 8:

[0184] Table 8

[0185]

[0186]

[0187] Among them, the aspheric surfaces of the respective lenses of the imaging optical lens 100 satisfy:

[0188]

[0189] Among them, x is the sagitta, the distance from the vertex of the aspheric surface when the aspheric surface is along the optical axis at a position with a height of h; c is the paraxial curvature of the aspheric surface, c = 1 / r (that is, the paraxial curvature c is the reciprocal of the radius of curvature r in Table 7 above); k is the conic constant (given in Table 7 above); Ai is the correction coefficient of the i-th to n-th order of the aspheric surface. The higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of each lens surface S1 - S8 are shown in Table 8.

[0190] It should be understood that the aspheric surfaces of the respective lenses in the optical lens 100 may use the aspheric surfaces shown by the above aspheric formula, or may use other aspheric formulas, which are not limited in the present application.

[0191] The design data of the optical lens 100 in Embodiment 4 of the present application are given above. The effective focal length EFL is 10.747 mm, the maximum field of view Fov is 33.803 degrees, the total optical length TTL is 16.471 mm, and the F-number F.No is 2.677.

[0192] In an embodiment provided by the present application, (R11 + R12) / (DT11 + DT12) = -3.934.

[0193] In an embodiment provided by the present application, TTL / T23 = 37.833.

[0194] In an embodiment provided by the present application, ΣET / ImgH = 0.626.

[0195] In an embodiment provided by the present application, f12 / (CT1 + CT2) = 3.420.

[0196] In an embodiment provided by the present application, BFL / f = 1.301.

[0197] In an embodiment provided by the present application, ΣCT / (ET1 + ET2) = 3.778.

[0198] In an embodiment provided by the present application, (SAG12 - SAG21) / T12 = -32.772.

[0199] In an embodiment provided by the present application, (R41 - R42) / (SAG41 - SAG42) = 30.288.

[0200] In an embodiment provided by the present application, (DT22 + DT31) / Tan(Semi - Fov) = 11.463.

[0201] Figures 18 to 21 The optical performance of the optical lens 100 designed in the lens combination manner of Embodiment IV is described.

[0202] In Embodiment IV, the optical lens meets the requirements of shortening the total length, high pixel, and high imaging quality.

[0203] Embodiment V

[0204] The optical lens 100 of an embodiment of the present application sequentially includes, from the object side to the image side: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a turning prism element 15, as Figure 22 shown.

[0205] For convenience of description, in the following embodiments, Stop represents the surface of the diaphragm, S1 represents the object side surface of the first lens 11, S2 represents the image side surface of the first lens 11, S3 represents the object side surface of the second lens 12, S4 represents the image side surface of the second lens 12, S5 represents the object side surface of the third lens 13, S6 represents the image side surface of the third lens 13, S7 represents the object side surface of the fourth lens 14, S8 represents the image side surface of the fourth lens 14, S9 represents the incident surface of the turning prism element 15, S10 represents the exit surface of the turning prism element 15, S11 represents the object side surface of the filter, S12 represents the image side surface of the filter, and S13 represents the imaging surface. The first lens 11 has a positive optical power. The object side surface S1 of the first lens 11 is concave near the optical axis; the image side surface S2 of the first lens 11 is convex near the optical axis; the second lens 12 has a positive optical power. The object side surface S3 of the second lens 12 is convex near the optical axis, and the image side surface S4 of the second lens 12 can be concave near the optical axis; the third lens 13 has a negative optical power. The object side surface S5 of the third lens 13 is concave near the optical axis, and the image side surface S6 of the third lens 13 is concave near the optical axis; the fourth lens 14 has a positive optical power. The object side surface S7 of the fourth lens 14 is convex near the optical axis, and the image side surface S8 of the fourth lens 14 is convex near the optical axis; before the turning prism element 15 turns the optical path, it includes an incident surface S9 and an exit surface S10. After turning the optical path, it may include an incident surface S9, a first reflecting surface P1, a total reflecting surface P2, a second reflecting surface P3, and an exit surface S10.

[0206] Let TTL represent the overall optical length of the optical lens 100, ImgH represent the maximum image height of the optical lens 100, and EFL represent the effective focal length of the optical lens 100. Let Ai represent the correction coefficient of the i-th to (i - n)-th order of the aspheric surface, where i = 4, 6, 8, 10, 12, 14, 16, and let k represent the conic coefficient.

[0207] According to the above relationships, Table 9 shows the effective focal length EFL, maximum field of view Fov, overall optical length TTL, aperture F value F.No, surface type, radius of curvature, thickness, refractive index of the material, and conic coefficient of the optical lens 100 in Embodiment 5. Among them, the units of the radius of curvature and thickness are both millimeters (mm), as shown in Table 9:

[0208] Table 9

[0209]

[0210] Table 10 shows the aspheric coefficients of the optical lens 100 in Embodiment 5 of the present application, as shown in Table 10:

[0211] Table 10

[0212]

[0213]

[0214] Among them, the aspherical surfaces of the respective lenses of the imaging optical lens 100 satisfy:

[0215]

[0216] Among them, x is the distance sagitta from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / r (that is, the paraxial curvature c is the reciprocal of the radius of curvature r in Table 9 above); k is the conic coefficient (given in Table 9 above); Ai is the correction coefficient of the i-th to (i - n)-th order of the aspherical surface, and the high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 of each lens surface S1 - S8 are shown in Table 10.

[0217] It should be understood that the aspherical surfaces of the respective lenses in the optical lens 100 may use the aspherical surfaces shown in the above aspherical formula or other aspherical formulas, and the present application does not make any limitations.

[0218] The design data of the optical lens 100 in the fifth embodiment of the present application are given above, with an effective focal length EFL of 10.672 mm, a maximum field of view angle Fov of 33.803 degrees, an overall optical length TTL of 16.438 mm, and an aperture F value F.No of 2.639.

[0219] In an embodiment provided by the present application, (R11 + R12) / (DT11 + DT12) = -8.000.

[0220] In an embodiment provided by the present application, TTL / T23 = 52.100.

[0221] In an embodiment provided by the present application, ΣET / ImgH = 0.649.

[0222] In an embodiment provided by the present application, f12 / (CT1 + CT2) = 3.009.

[0223] In an embodiment provided by the present application, BFL / f = 1.293.

[0224] In an embodiment provided by the present application, ΣCT / (ET1 + ET2) = 3.313.

[0225] In an embodiment provided by the present application, (SAG12 - SAG21) / T12 = -15.000.

[0226] In an embodiment provided by the present application, (R41 - R42) / (SAG41 - SAG42) = 31.991.

[0227] In an embodiment provided by the present application, (DT22 + DT31) / Tan(Semi-Fov) = 11.463.

[0228] Figures 23 to 26 The optical performance of the optical lens 100 designed in the lens combination mode of Embodiment Five is described.

[0229] In Embodiment Five, the optical lens meets the requirements of shortening the total length, high pixel, and high imaging quality.

[0230] In addition, the ratios of (R11 + R12) / (DT11 + DT12), TTL / T23, ΣET / ImgH, f12 / (CT1 + CT2), BFL / f, ΣCT / (ET1 + ET2), (SAG12 - SAG21) / T12, (R41 - R42) / (SAG41 - SAG42), and (DT22 + DT31) / Tan(Semi-Fov) corresponding to Embodiments One to Five are shown in Table 11:

[0231] Table 11

[0232]

[0233]

[0234] The present invention is described by way of preferred embodiments. Those skilled in the art will appreciate that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the invention. The invention is not limited by the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of the present application are all within the scope of protection of the invention.

Claims

1. A telephoto optical lens, characterized in that, In order from the object side to the image side along the optical axis, it includes: A first lens with positive refractive power; its object side surface is concave near the optical axis; its image side surface is convex near the optical axis; A second lens with positive refractive power; its object side surface is convex near the optical axis; its image side surface is concave near the optical axis; A third lens with negative refractive power, its image side surface is concave near the optical axis; A fourth lens with positive refractive power, its object side surface is convex near the optical axis; its image side surface is convex near the optical axis; The first lens, the second lens, the third lens and the fourth lens are all aspherical lenses; The optical lens satisfies the following conditional expressions: -8.000 ≤ (R11 + R12) / (DT11 + DT12) ≤ -3.934; 19.999 ≤ TTL / T23 ≤ 52.100; Wherein, R11 is the curvature radius of the object side surface of the first lens; R12 is the curvature radius of the image side surface of the first lens; DT11 is the maximum effective radius of the object side surface of the first lens; DT12 is the maximum effective radius of the image side surface of the first lens; TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens; T23 is the air separation distance between the second lens and the third lens on the optical axis.

2. The telephoto optical lens according to claim 1, wherein, The optical lens satisfies the following conditional expressions: 0.446 ≤ ∑ET / ImgH ≤ 0.657; Wherein, ΣET is the total sum of the edge thicknesses of all lenses in the optical imaging system; ImgH is the maximum image height of the optical lens.

3. The telephoto optical lens according to claim 1, wherein, The optical lens satisfies the following conditional expressions: 3.009 ≤ f12 / (CT1 + CT2) ≤ 9.991; Wherein, f12 is the combined focal length of the first lens and the second lens; CT1 is the central thickness of the first lens on the optical axis; CT2 is the central thickness of the second lens on the optical axis.

4. The telephoto optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: 1.227 ≤ BFL / f ≤ 1.358; Wherein, BFL is the back focal length of the optical lens; f is the total effective focal length of the optical lens.

5. The telephoto optical lens according to claim 1, wherein, The optical lens satisfies the following conditional expressions: 3.313 ≤ ∑CT / (ET1 + ET2) ≤ 5.001; Wherein, ΣCT is the total sum of the central thicknesses of all lenses in the optical imaging system; ET1 is the edge thickness of the first lens; ET2 is the edge thickness of the second lens.

6. The telephoto optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: -32.772 ≤ (SAG12 - SAG21) / T12 ≤ -15.000; Wherein, SAG12 is the sag SG value of the image side surface of the first lens corresponding to the maximum field of view angle of the optical lens; SAG21 is the sag SG value of the object side surface of the second lens corresponding to the maximum field of view angle of the optical lens; T12 is the air separation distance between the first lens and the second lens on the optical axis.

7. The telephoto optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: 25.068 ≤ (R41 - R42) / (SAG41 - SAG42) ≤ 34.047; Wherein, R41 is the curvature radius of the object side surface of the fourth lens; R42 is the curvature radius of the image side surface of the fourth lens; SAG41 is the sag value of the object side surface of the fourth lens corresponding to the maximum field of view angle of the optical lens; SAG42 is the sag value of the image side surface of the fourth lens corresponding to the maximum field of view angle of the optical lens.

8. The telephoto optical lens according to claim 1, wherein The optical lens satisfies the following conditional formula: 10.141 ≤ (DT22 + DT31) / Tan(Semi-Fov) ≤ 14.371; Wherein, DT22 is the maximum effective radius of the image side surface of the second lens; DT31 is the maximum effective radius of the object side surface of the third lens; Semi-FOV is half of the maximum field of view angle of the optical lens.

9. An optical lens module, characterized in that, It includes the telephoto optical lens according to any one of claims 1 to 8.

10. The optical lens module according to claim 9, wherein It further includes a turning prism element, wherein the turning prism element is arranged between the fourth lens and the imaging surface before turning the optical path.

11. The optical lens module according to claim 9, wherein, After the turning prism element turns the optical path, it includes an incident surface, a first reflection surface, a total reflection surface, a second reflection surface and an exit surface; light travels along the first optical axis direction through the first lens to the fourth lens, enters the turning prism element from the incident surface, is reflected by the first reflection surface, then travels along the second optical axis direction and is incident on the total reflection surface, is reflected by the total reflection surface, then travels along the third optical axis direction and is incident on the second reflection surface, is reflected by the second reflection surface, and then travels along the fourth optical axis direction and exits from the exit surface to the imaging surface; the imaging surface, the first lens to the fourth lens are all located on the same side of the turning prism element.

Images