Optical lens

Abstract

The invention provides an optical lens. The optical lens comprises a first optical assembly, the first optical assembly comprises a first lens to a fourth lens which are sequentially arranged along a first optical axis, the object side surface of the first lens is a convex surface, and the object side surface of the second lens is a convex surface; the system comprises a first optical assembly, a turn-back prism assembly which is located on the light-emitting side of the first optical assembly and is a trapezoidal prism as a whole, and a second optical assembly which is located on the light-emitting side of the prism assembly and at least comprises an imaging surface. Wherein the effective focal length f4 of the fourth lens, the thickness M of the trapezoidal prism and the bottom waist angle alpha of the trapezoidal prism meet the condition that f4 * tana / M is larger than or equal to-3.77 and smaller than or equal to-1.64. The long-focus optical lens solves the problem that in the prior art, a long-focus optical lens with a large focal length is prone to generating ghost images of the internal reflection prism while meeting the requirement for miniaturization.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical lens. Background Art

[0002] With the development of electronic products, imaging systems play an important role in electronic products. Users have more and more demands for electronic products to capture images, and require electronic devices to meet the diversified photography needs. As electronic products develop towards miniaturization, optical lenses also need to develop towards miniaturization at the same time. In particular, telephoto optical lenses use folding prism components to reduce the size of optical lenses while meeting the needs of optical lens photography. However, internal prism ghost images are easily generated in the folding prism component, affecting the imaging quality of the optical lens.

[0003] That is to say, in the prior art, a telephoto optical lens with a large focal length is prone to the problem of internal reflection prism ghost images while meeting the requirement of miniaturization. Summary of the invention

[0004] The main purpose of the present invention is to provide an optical lens to solve the problem that a telephoto optical lens with a large focal length in the prior art is prone to produce internal reflection prism ghost images while meeting the requirements of miniaturization.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, an optical lens is provided, comprising: a first optical component, the first optical component comprising a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power and a fourth lens with negative optical power arranged in sequence along a first optical axis, the object side surface of the first lens is a convex surface, and the object side surface of the second lens is a convex surface; a folding prism assembly, the folding prism assembly is located on the light-emitting side of the first optical component, the folding prism assembly is a trapezoidal prism as a whole, and the folding prism assembly has at least one stray light total reflection surface, the stray light total reflection surface is used to reflect the stray light generated in the folding prism assembly and pass the imaging light; a second optical component, the second optical component is located on the light-emitting side of the prism assembly, and the second optical component at least includes an imaging surface; wherein the effective focal length f4 of the fourth lens, the thickness M of the trapezoidal prism and the bottom waist angle ɑ of the trapezoidal prism satisfy: -3.77≤f4*tanɑ / M≤-1.64.

[0006] According to another aspect of the present invention, an optical lens is provided, comprising: a first optical component, the first optical component comprising a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power and a fourth lens with negative optical power arranged in sequence along a first optical axis, the object side surface of the first lens being a convex surface, and the object side surface of the second lens being a convex surface; a folding prism component, the folding prism component is located on the light-exiting side of the first optical component, the folding prism component as a whole is a trapezoidal prism, and a second optical component, the second optical component is located on the light-exiting side of the prism component, and the second optical component at least includes an imaging surface; wherein the length L of the equivalent flat plate of the optical lens and the distance TD on the optical axis of the optical lens from the object side surface of the first lens closest to the object side to the image side surface of the last lens closest to the image side satisfy: 4.69≤L / TD≤5.56; the combined focal length f34 of the third lens and the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 1.09≤|f34 / R8|≤3.02.

[0007] According to another aspect of the present invention, an optical lens is provided, comprising: a first optical component, the first optical component comprising a first lens with positive optical focal length, a second lens with positive optical focal length, a third lens with negative optical focal length and a fourth lens with negative optical focal length arranged in sequence along a first optical axis, the object side surface of the first lens is a convex surface, and the object side surface of the second lens is a convex surface; a folding prism assembly, the folding prism assembly is located on the light-emitting side of the first optical component, the folding prism assembly as a whole is a trapezoidal prism, and a second optical component, the second optical component is located on the light-emitting side of the prism assembly, and the second optical component at least includes an imaging surface; wherein the combined focal length f34 of the third lens and the fourth lens and the maximum distance MD from the object side surface of the first lens to the folding prism assembly satisfy: -2.49≤f34 / MD≤-0.79.

[0008] Furthermore, the folding prism assembly has an incident surface, multiple reflection surfaces and an exit surface in sequence along the direction of the light path, and there is at least one stray light total reflection surface between the multiple reflection surfaces. The stray light total reflection surface is used to reflect the stray light generated in the folding prism assembly and pass the imaging light.

[0009] Furthermore, there are at least a first stray light total reflection surface and a second stray light total reflection surface between the multiple reflection surfaces, and the distance between the first stray light total reflection surface and the second stray light total reflection surface gradually increases toward a side away from the plane where the incident surface is located.

[0010] Furthermore, a first angle β1 is formed between the first stray light total reflection surface and the incident surface, and the first angle β1 is greater than or equal to 30° and less than or equal to 47°.

[0011] Furthermore, a second angle β2 is defined between the second stray light total reflection surface and the incident surface, and the second angle β2 is greater than or equal to 133° and less than or equal to 150°.

[0012] Furthermore, a first angle β1 is formed between the first stray light total reflection surface and the incident surface, a second angle β2 is formed between the second stray light total reflection surface and the incident surface, and the first angle β1 is complementary to the second angle β2.

[0013] Furthermore, the folding prism assembly includes, in sequence along the optical path: an incident surface, a first reflection surface, a second reflection surface, a first penetration surface, a second penetration surface, a third reflection surface, a third penetration surface, a fourth penetration surface, a fourth reflection surface, a fifth reflection surface and an exit surface, wherein the first penetration surface and the second penetration surface are spaced apart to form a first interval, the third penetration surface and the fourth penetration surface are spaced apart to form a second interval, the first penetration surface serves as a first stray light total reflection surface, and the third penetration surface serves as a second stray light total reflection surface.

[0014] Furthermore, the folding prism assembly includes a first prism, a second prism and a third prism arranged in sequence, a first interval is provided between the first prism and the second prism, a second interval is provided between the second prism and the third prism, and a connecting adhesive layer is provided between the first interval and the second interval.

[0015] Further, the first optical component has a first optical axis, the second optical component has a second optical axis, the first optical axis is parallel to the second optical axis, and a distance t between the first optical axis and the second optical axis is greater than or equal to 21.39 mm and less than or equal to 29.50 mm.

[0016] Furthermore, a length L of an equivalent flat plate of the optical lens and a distance TD on the optical axis of the optical lens from the object side surface of the first lens closest to the object side to the image side surface of the last lens closest to the image side satisfy: 4.69≤L / TD≤5.56.

[0017] Furthermore, an effective focal length f1 of the first lens, a center thickness CT1 of the first lens on the first optical axis, and a refractive index N1 of the first lens satisfy: 3.93≤f1 / (CT1*N1)≤7.56.

[0018] Further, a curvature radius R3 of the object side surface of the second lens, a center thickness CT3 of the third lens on the first optical axis, and an air interval T34 between the third lens and the fourth lens on the first optical axis satisfy: 2.66≤R3 / (CT3+T34)≤11.77.

[0019] Further, an air interval T34 between the third lens and the fourth lens on the optical axis, an air interval T12 between the first lens and the second lens on the optical axis, and an air interval T23 between the second lens and the third lens on the optical axis satisfy: 0.95≤T34 / (T12+T23)≤9.82.

[0020] Furthermore, the combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 2.53≤f12 / (CT1+CT2)≤3.67.

[0021] Furthermore, an on-axis distance SAG11 between an intersection of the object side surface of the first lens and the first optical axis to a vertex of an effective radius of the object side surface of the first lens, and an on-axis distance SAG22 between an intersection of the image side surface of the second lens and the first optical axis to a vertex of an effective radius of the image side surface of the second lens satisfy the following: 1.34≤(SAG11+SAG22) / (SAG11-SAG22)≤4.33.

[0022] Further, the Abbe number V2 of the second lens is greater than the Abbe number V3 of the third lens.

[0023] Furthermore, a combined focal length f34 of the third lens and the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens satisfy: 1.09≤|f34 / R8|≤3.02.

[0024] Furthermore, the first lens has positive optical power, and the object side surface of the first lens is convex; the second lens has positive optical power, and the object side surface of the second lens is convex; and the third lens has negative optical power.

[0025] Furthermore, the first optical component has a first optical axis, the second optical component has a second optical axis, the first optical axis is parallel to the second optical axis, and the distance t between the first optical axis and the second optical axis and the refractive index n of the folding prism component satisfy: 14.07mm≤t / n≤19.41mm.

[0026] According to the technical solution of the present invention, the optical lens comprises a first optical component, a folding prism component and a second optical component, wherein the first optical component comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power and a fourth lens with negative focal power which are arranged in sequence along a first optical axis, the object side surface of the first lens is a convex surface, and the object side surface of the second lens is a convex surface; the folding prism component is located on the light-emitting side of the first optical component; the folding prism component is located on the light-emitting side of the first optical component, the folding prism component is a trapezoidal prism as a whole, the second optical component is located on the light-emitting side of the prism component, and the second optical component at least comprises an imaging surface; wherein the effective focal length f4 of the fourth lens, the thickness M of the trapezoidal prism and the bottom waist angle ɑ of the trapezoidal prism satisfy the following condition: -3.77≤f4*tanɑ / M≤-1.64.

[0027] By setting the first lens to have a positive optical power and setting the object side surface of the first lens to be a convex surface, it is beneficial for large-angle light to enter the optical system, which is beneficial to improving the field angle of the optical lens and the imaging quality of the optical lens. The light is converged after passing through the first lens, and is matched with a second lens with a positive optical power, and is converged again when passing through the second lens. At the same time, the object side surface of the second lens is set to a convex surface, which is beneficial to further converge the light, and can effectively reduce the height of the rear lens and reduce the difficulty of lens molding; and setting the third lens to have a negative optical power can diffuse the light, which can effectively balance the aberration brought by the front lens and improve the imaging quality. Setting the fourth lens to have a negative optical power and matching it with the third lens with a negative optical power can reduce the degree of light deflection, so that the light transitions smoothly between the lenses, which is beneficial to improving the imaging quality. By setting the first optical component, the reentry prism component and the second optical component, the light is reentered multiple times in the reentry prism component, which can extend the propagation path of the light in the optical lens, thereby facilitating the improvement of the focal length of the optical lens, and at the same time limiting the range of f4*tanɑ / M, the thickness of the reentry prism component can be controlled within a reasonable range, which is beneficial to the miniaturization of the optical lens, and at the same time ensuring that the light emitted through the fourth lens smoothly enters the reentry prism component and can be reentered multiple times in the reentry prism component, so that the optical lens can meet the requirements of both long focus and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 A schematic structural diagram of an optical lens according to a first embodiment of the present invention is shown;

[0030] Figure 2 Shows Figure 1A schematic diagram of the structure of the middle reentrant prism assembly;

[0031] Figure 3 Shows Figure 1 A schematic structural diagram of the first optical component;

[0032] Figure 4 A schematic structural diagram of an optical lens according to a second embodiment of the present invention is shown;

[0033] Figure 5 Shows Figure 4 A schematic diagram of the structure of the middle reentrant prism assembly;

[0034] Figure 6 Shows Figure 4 A schematic structural diagram of the first optical component;

[0035] Figure 7 A schematic structural diagram of an optical lens according to a third embodiment of the present invention is shown;

[0036] Figure 8 Shows Figure 7 A schematic diagram of the structure of the middle reentrant prism assembly;

[0037] Fig. 9 Shows Figure 7 A schematic structural diagram of the first optical component;

[0038] Fig.10 A schematic structural diagram of an optical lens according to a fourth embodiment of the present invention is shown;

[0039] Fig.11 Shows Fig.10 A schematic diagram of the structure of the middle reentrant prism assembly;

[0040] Fig.12 Shows Fig.10 A schematic structural diagram of the first optical component;

[0041] Fig.13 A schematic structural diagram of an optical lens according to a fifth embodiment of the present invention is shown;

[0042] Fig.14 Shows Fig.13 A schematic diagram of the structure of the middle reentrant prism assembly;

[0043] Fig.15 Shows Fig.13 A schematic structural diagram of the first optical component;

[0044] Fig.16 A transmission optical path diagram of stray light in a folding prism assembly according to an optional embodiment of the present invention is shown;

[0045] Fig.17 Shows that there is Fig.16 The stray light distribution diagram of the optical lens of the folding prism assembly shown;

[0046] Fig.18 A transmission optical path diagram of stray light in a folding prism assembly in one example is shown;

[0047] Fig.19 Shows that there is Fig.18 The stray light distribution diagram of the optical lens of the folding prism assembly is shown.

[0048] The above drawings include the following reference numerals:

[0049] 10, first optical component; 20, folding prism component; 21, first prism; 22, second prism; 23, third prism; E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; S1, object side surface of first lens; S2, image side surface of first lens; S3, object side surface of second lens; S4, image side surface of second lens; S5, object side surface of third lens; S6, image side surface of third lens; S7, object side surface of fourth lens; S8, image side surface of fourth lens ; S11, incident surface; S12, first reflection surface; S13, second reflection surface; S14, first transmission surface (first stray light total reflection surface); S15, second transmission surface; S16, third reflection surface; S17, third transmission surface (second stray light total reflection surface); S18, fourth transmission surface; S19, fourth reflection surface; S20, fifth reflection surface; S21, exit surface; S22, object side surface of the filter element; S23, image side surface of the filter element; S24, imaging surface; 30, second optical component. DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0051] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0052] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0053] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0054] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0055] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of the general knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concave and convex. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In this application, the left side is the object side and the right side is the image side.

[0056] In order to solve the problem in the prior art that a telephoto optical lens with a large focal length is prone to generate internal reflection prism ghost images while meeting the requirement of miniaturization, the present invention provides an optical lens.

[0057] like Figures 1 to 17 As shown, the optical lens comprises a first optical component 10, a folding prism component 20 and a second optical component 30, wherein the first optical component 10 comprises a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power and a fourth lens with negative optical power arranged in sequence along a first optical axis, the object side surface of the first lens is a convex surface, and the object side surface of the second lens is a convex surface; the folding prism component 20 is located at the light exit side of the first optical component 10; the folding prism component 20 is located at the first On the light-emitting side of the optical component 10, the folding prism component 20 is a trapezoidal prism as a whole, and has at least one stray light total reflection surface in the folding prism component, which is used to reflect the stray light generated in the folding prism component and pass the imaging light; the second optical component 30 is located on the light-emitting side of the prism component, and the second optical component 30 includes at least an imaging surface; wherein the effective focal length f4 of the fourth lens, the thickness M of the trapezoidal prism and the bottom waist angle ɑ of the trapezoidal prism satisfy: -3.77≤f4*tanɑ / M≤-1.64.

[0058] By setting the first lens to have a positive optical power and setting the object side surface of the first lens to be a convex surface, it is beneficial for large-angle light to enter the optical system, which is beneficial to improving the field angle of the optical lens and the imaging quality of the optical lens. The light is converged after passing through the first lens, and is matched with a second lens with a positive optical power, and is converged again when passing through the second lens. At the same time, the object side surface of the second lens is set to a convex surface, which is beneficial to further converge the light, and can effectively reduce the height of the rear lens and reduce the difficulty of lens molding; and setting the third lens to have a negative optical power can diffuse the light, which can effectively balance the aberration brought by the front lens and improve the imaging quality. Setting the fourth lens to have a negative optical power and matching it with the third lens with a negative optical power can reduce the degree of light deflection, so that the light transitions smoothly between the lenses, which is beneficial to improving the imaging quality. By setting the first optical component 10, the folding prism component 20 and the second optical component 30, the light is folded back multiple times in the folding prism component 20, which can extend the propagation path of the light in the optical lens, thereby facilitating the improvement of the focal length of the optical lens, and at the same time limiting the range of f4*tanɑ / M, the thickness of the folding prism component 20 can be controlled within a reasonable range, which is conducive to the miniaturization of the optical lens, and at the same time ensuring that the light emitted through the fourth lens smoothly enters the folding prism component 20 and can be folded back multiple times in the folding prism component 20, so that the optical lens is also miniaturized. By setting a stray light total reflection surface in the prism, the stray light generated in the folding prism component 20 can be reflected, so that the stray light will not follow the imaging light into the rear optical system, thereby effectively reducing the ghost image in the folding prism component 20.

[0059] It should be noted that the folding prism assembly 20 as a whole is a trapezoidal prism, which means that the cross section of the folding prism assembly 20 in a direction parallel to the first plane is a trapezoid. In some optional embodiments, the folding prism assembly 20 has two opposite surfaces parallel to the first plane. The first optical axis and the second optical axis are located on the first plane.

[0060] In some optional embodiments, the folding prism assembly 20 has an incident surface, a plurality of reflection surfaces, and an exit surface in sequence along the direction of the optical path, and at least one stray light total reflection surface is provided between the plurality of reflection surfaces, and the stray light total reflection surface is used to reflect the stray light generated in the folding prism assembly 20 and pass the imaging light. The imaging light emitted by the first optical component 10 enters the folding prism assembly 20 through the incident surface, and is reflected between the plurality of reflection surfaces, and is emitted through the exit surface, and the emitted light enters the second optical component 30. As the focal length and aperture of the optical lens increase, the internal prism ghost image is easily generated in the folding prism assembly 20, and by providing a stray light total reflection surface in the prism, the stray light generated in the folding prism assembly 20 can be reflected, so that the stray light will not follow the imaging light into the rear optical system, thereby effectively reducing the ghost image in the folding prism assembly 20.

[0061] Fig.16 FIG. 2 shows a stray light transmission diagram in the folding prism assembly 20 in an optional embodiment of the present application. Fig.17 For assembly Fig.16 A stray light diagram of the optical lens of the folding prism assembly 20; Fig.18 FIG. 2 shows a stray light transmission diagram in a folding prism assembly 20 in an example. Fig.19 For assembly Fig.18 FIG. 2 is a stray light diagram of the optical lens of the folding prism assembly 20. Fig.16 As shown, the stray light is totally reflected in the folding prism assembly 20 after passing through the first stray light total reflection surface, and does not enter the exit surface. Fig.17 As shown in the stray light diagram, the assembly has Fig.16 The optical lens of the folding prism assembly 20 shown has no obvious ghost images. Fig.18 As shown, stray light is refracted and reflected in the folding prism assembly 20 and emitted from the light-emitting surface, affecting the imaging quality of the optical lens. Fig.19 As shown in the stray light diagram, the assembly has Fig.18 There are obvious ghost images in the optical lens of the reentrant prism assembly 20.

[0062] In some optional embodiments, there are at least a first stray light total reflection surface and a second stray light total reflection surface between the multiple reflection surfaces, and the distance between the first stray light total reflection surface and the second stray light total reflection surface gradually increases toward the side away from the plane where the incident surface is located. By providing the first stray light total reflection surface and the second stray light total reflection surface, the reflection efficiency of stray light can be improved, and the stray light entering the rear optical system can be further reduced. At the same time, the first stray light total reflection surface and the second stray light total reflection surface have different inclination directions, and stray light with different incident angles can be reflected to improve the stray light reflection efficiency, thereby effectively reducing stray light.

[0063] In some optional embodiments, there is a first angle β1 between the first stray light total reflection surface and the incident surface, and the first angle β1 is greater than or equal to 30° and less than or equal to 47°. By limiting the first angle β1 to a range of 30° to 47°, the reflected stray light in the folding prism assembly 20 can satisfy the law of reflection when passing through the first stray light total reflection surface, thereby causing total reflection, reducing stray light from entering the rear optical system, and eliminating the reflected stray light in the folding prism assembly 20.

[0064] In some optional embodiments, there is a second angle β2 between the second stray light total reflection surface and the incident surface, and the second angle β2 is greater than or equal to 133° and less than or equal to 150°. By limiting the second angle β2 to a range of 133° to 150°, the reflected stray light in the folding prism assembly 20 can satisfy the law of reflection when passing through the second stray light total reflection surface, thereby causing total reflection, reducing stray light from entering the rear optical system, and eliminating the reflected stray light in the folding prism assembly 20.

[0065] In some optional embodiments, a first angle β1 is formed between the first stray light total reflection surface and the incident surface, a second angle β2 is formed between the second stray light total reflection surface and the incident surface, and the first angle β1 is complementary to the second angle β2. By setting the first angle β1 and the second angle β2 to be complementary, it is beneficial to manufacture the folding prism assembly 20 and reduce the difficulty of processing the folding prism assembly 20.

[0066] In some optional embodiments, the direction of the folding prism assembly 20 along the optical path includes: an incident surface, a first reflection surface, a second reflection surface, a first penetration surface, a second penetration surface, a third reflection surface, a third penetration surface, a fourth penetration surface, a fourth reflection surface, a fifth reflection surface and an exit surface in sequence, wherein the first penetration surface and the second penetration surface are spaced apart to form a first interval, the third penetration surface and the fourth penetration surface are spaced apart to form a second interval, the first penetration surface serves as a first stray light total reflection surface, and the third penetration surface serves as a second stray light total reflection surface. The imaging light can pass through the first penetration surface, the second penetration surface, the third penetration surface, and the fourth penetration surface to enter the rear optical system, and the reflected stray light in the folding prism will be totally reflected when passing through the first penetration surface (the first stray light total reflection surface) and the third penetration surface (the second stray light total reflection surface) to reduce the stray light entering the rear optical system and improve the imaging quality of the optical lens.

[0067] In some optional embodiments, the folding prism assembly 20 includes a first prism 21, a second prism 22, and a third prism 23 arranged in sequence, a first interval is provided between the first prism 21 and the second prism 22, a second interval is provided between the second prism 22 and the third prism 23, and a connecting adhesive layer is provided between the first interval and the second interval. The folding prism assembly 20 is composed of the first prism 21, the second prism 22, and the third prism 23, and the surface where the first prism 21 and the second prism 22 are connected is used as the first stray light total reflection surface, and the surface where the second prism 22 and the third prism 23 are connected is used as the second stray light total reflection surface, and such an arrangement facilitates the manufacture of the folding prism assembly 20 and reduces the difficulty of processing the folding prism assembly 20.

[0068] It should be noted that the cross-sections of the first prism 21, the second prism 22 and the third prism 23 in the direction parallel to the first plane are all trapezoidal. In some optional embodiments, the first prism 21, the second prism 22 and the third prism 23 each have two opposite surfaces parallel to the first plane. The first optical axis and the second optical axis are located on the first plane.

[0069] In some optional embodiments, the first prism 21 , the second prism 22 , and the third prism 23 are all isosceles trapezoids.

[0070] In some optional embodiments, the first prism 21 , the second prism 22 , and the third prism 23 are made of the same material.

[0071] In some optional embodiments, the first optical component 10 has a first optical axis, the second optical component 30 has a second optical axis, the first optical axis is parallel to the second optical axis, and the distance t between the first optical axis and the second optical axis is greater than or equal to 21.39 mm and less than or equal to 29.50 mm. By limiting the distance between the first optical axis and the second optical axis, the radial size of the optical lens can be guaranteed, and space is reserved for matching the whole machine, which is conducive to the miniaturization of the optical lens.

[0072] In some optional embodiments, the length L of the equivalent flat plate of the optical lens and the distance TD on the optical axis of the optical lens from the object side of the first lens closest to the object side to the image side of the last lens closest to the image side satisfy: 4.69≤L / TD≤5.56. By limiting L / TD within a reasonable range, while ensuring that the focal length of the optical lens meets the telephoto performance, it is beneficial to reduce the length of the optical lens along the optical axis, and to shorten the axial size of the optical lens, which is beneficial to miniaturization of the optical lens while meeting the telephoto performance requirements.

[0073] It should be noted that the length L of the equivalent flat plate refers to the actual distance from the incident surface S11 to the exit surface S21 in the folding prism assembly.

[0074] In some optional embodiments, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the first optical axis, and the refractive index N1 of the first lens satisfy: 3.93≤f1 / (CT1*N1)≤7.56. By limiting f1 / (CT1*N1) within a reasonable range, the deflection angle of the light when passing through the first lens can be controlled, which is beneficial for large-angle light to be incident on the optical lens. At the same time, the first lens satisfies the above relationship to meet the telephoto characteristics. At the same time, the first lens can be made of glass material, which can reduce the temperature drift of the optical lens to ensure that the optical lens still has good shooting quality in high temperature environment and low temperature environment.

[0075] In some optional embodiments, the radius of curvature R3 of the object side of the second lens, the center thickness CT3 of the third lens on the first optical axis, and the air interval T34 between the third lens and the fourth lens on the first optical axis satisfy: 2.66≤R3 / (CT3+T34)≤11.77. By limiting R3 / (CT3+T34) within a reasonable range, the deflection angle of the light passing through the object side of the second lens can be controlled, so that the light emitted through the second lens can smoothly enter the rear optical system. At the same time, the center thickness of the third lens and the air interval between the third lens and the fourth lens are controlled, which is conducive to controlling the shape of the third lens, reducing the difficulty of molding the third lens while ensuring that the third lens smoothly receives the light emitted by the second lens, and at the same time ensuring that the third lens and the spacing between the third lens and the fourth lens are within a reasonable range, which is conducive to further miniaturization of the optical lens.

[0076] In some optional embodiments, the air interval T34 between the third lens and the fourth lens on the optical axis, the air interval T12 between the first lens and the second lens on the optical axis, and the air interval T23 between the second lens and the third lens on the optical axis satisfy: 0.95≤T34 / (T12+T23)≤9.82. By limiting T34 / (T12+T23) within a reasonable range, the air interval between the first lens to the fourth lens can be guaranteed, which is conducive to reducing the size of the optical lens in the direction of the first optical axis, and is conducive to further miniaturization of the optical lens, and reserving space for matching with the whole machine.

[0077] In some optional embodiments, the combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 2.53≤f12 / (CT1+CT2)≤3.67. By limiting f12 / (CT1+CT2) within a reasonable range, it is helpful to control the transmission path of the light in the first lens and the second lens, control the deflection angle of the light in the first lens and the second lens, ensure that the optical lens reduces the aberration of the optical lens while meeting the telephoto performance, and improve the imaging quality of the optical lens.

[0078] In some optional embodiments, the axial distance SAG11 between the intersection of the object side surface of the first lens and the first optical axis to the effective radius vertex of the object side surface of the first lens, and the axial distance SAG22 between the intersection of the image side surface of the second lens and the first optical axis to the effective radius vertex of the image side surface of the second lens satisfy: 1.34≤(SAG11+SAG22) / (SAG11-SAG22)≤4.33. By limiting (SAG11+SAG22) / (SAG11-SAG22) within a reasonable range, it is helpful to control the morphology of the object side surface of the first lens and the image side surface of the second lens, while reducing the difficulty of molding the first lens and the second lens, ensuring the deflection angle when the light enters the first lens and the deflection angle when it emerges from the second lens, which is helpful to control the path of light transmission in the first lens and the second lens, and further facilitates the control of the imaging quality of the optical lens.

[0079] In some optional embodiments, the Abbe number V2 of the second lens is greater than the Abbe number V3 of the third lens. By controlling the relationship between the Abbe numbers of the second lens and the third lens, the aberration of the optical lens can be optimized by controlling the material distribution of the second lens and the third lens, thereby improving the imaging quality of the optical imaging lens.

[0080] In some optional embodiments, the combined focal length f34 of the third lens and the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: 1.09≤|f34 / R8|≤3.02. By limiting |f34 / R8| within a reasonable range, the overall deflection degree of the light in the three lenses and the fourth lens can be controlled, the trend of the light in the third lens and the fourth lens can be controlled, and the deflection degree of the light when it is emitted from the image side of the fourth lens can be controlled, which is conducive to the smooth incidence of the light into the return prism assembly 20, while meeting the telephoto performance of the optical lens and improving the imaging quality of the optical lens. In addition, the shape of the fourth lens can also be controlled, the difficulty of molding the fourth lens can be reduced, and the yield of the fourth lens can be improved.

[0081] In some optional embodiments, the first optical component 10 has a first optical axis, the second optical component 30 has a second optical axis, the first optical axis is parallel to the second optical axis, and the distance t between the first optical axis and the second optical axis and the refractive index n of the folding prism assembly satisfy: 14.07mm≤t / n≤19.41mm. Constraining t / n within a reasonable range through constraints facilitates multiple reflections, ensures that the size of the folding prism assembly with a larger focal length is smaller, thereby reducing the size of the optical module, so that the optical lens meets the requirements of miniaturization, and is conducive to miniaturization of the optical lens while meeting the requirements of telephoto performance.

[0082] In some optional embodiments, the second optical component 30 may further include a filter element and / or a protection element, and of course, may also include a lens with optical power, which is not specifically limited here.

[0083] On the other hand, in another optional embodiment of the present application, the optical lens comprises: a first optical component 10, the first optical component 10 comprises a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power and a fourth lens with negative optical power arranged in sequence along a first optical axis, the object side surface of the first lens is a convex surface, and the object side surface of the second lens is a convex surface; a folding prism assembly 20, the folding prism assembly 20 is located on the light exit side of the first optical component 10, the folding prism assembly 20 is a trapezoidal prism as a whole, and the second optical component 10 is a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power and a fourth lens with negative optical power arranged in sequence along a first optical axis, the object side surface of the first lens is a convex surface, and the object side surface of the second lens is a convex surface; Component 30, the second optical component 30 is located on the light-emitting side of the prism component, and the second optical component 30 at least includes an imaging surface; wherein, the length L of the equivalent flat plate of the optical lens, and the distance TD on the optical axis of the optical lens from the object side surface of the first lens closest to the object side to the image side surface of the last lens closest to the image side satisfy: 4.69≤L / TD≤5.56; the combined focal length f34 of the third lens and the fourth lens, and the curvature radius R8 of the image side surface of the fourth lens satisfy: 1.09≤|f34 / R8|≤3.02.

[0084] By setting the first lens to have a positive optical power and setting the object side surface of the first lens to be a convex surface, it is beneficial for large-angle light to enter the optical system, which is beneficial to improving the field angle of the optical lens and the imaging quality of the optical lens. The light is converged after passing through the first lens, and is matched with a second lens with a positive optical power, and is converged again when passing through the second lens. At the same time, the object side surface of the second lens is set to a convex surface, which is beneficial to further converge the light, and can effectively reduce the height of the rear lens and reduce the difficulty of lens molding; and setting the third lens to have a negative optical power can diffuse the light, which can effectively balance the aberration brought by the front lens and improve the imaging quality. Setting the fourth lens to have a negative optical power and matching it with the third lens with a negative optical power can reduce the degree of light deflection, so that the light transitions smoothly between the lenses, which is beneficial to improving the imaging quality. By setting the first optical component 10, the folding prism component 20 and the second optical component 30, the light is folded back multiple times in the folding prism component 20, which can extend the propagation path of the light in the optical lens, thereby helping to improve the focal length of the optical lens. At the same time, L / TD and |f34 / R8| are limited within a reasonable range, and the overall deflection degree of the light in the three lenses and the fourth lens can be controlled, and the trend of the light in the third lens and the fourth lens can be controlled. At the same time, the deflection degree of the light when it is emitted from the image side of the fourth lens is controlled, which is conducive to the smooth incidence of the light into the folding prism component 20, while meeting the telephoto performance of the optical lens and improving the imaging quality of the optical lens. At the same time, the overall size of the optical lens is controlled, which is conducive to reducing the length of the optical lens along the optical axis while ensuring the imaging performance of the optical lens, and is conducive to shortening the axial size of the optical lens, thereby helping to miniaturize the optical lens. In addition, the shape of the fourth lens can also be controlled, the molding difficulty of the fourth lens can be reduced, and the yield of the fourth lens can be improved.

[0085] On the other hand, in another embodiment of the present application, the optical lens includes: a first optical component 10, the first optical component 10 includes a first lens with positive optical focal length, a second lens with positive optical focal length, a third lens with negative optical focal length and a fourth lens with negative optical focal length arranged in sequence along a first optical axis, the object side surface of the first lens is a convex surface, and the object side surface of the second lens is a convex surface; a folding prism assembly 20, the folding prism assembly 20 is located on the light-emitting side of the first optical component 10, and the folding prism assembly 20 is a trapezoidal prism as a whole; a second optical component 30, the second optical component 30 is located on the light-emitting side of the prism assembly, and the second optical component 30 at least includes an imaging surface; wherein, the combined focal length f34 of the third lens and the fourth lens, and the maximum distance MD from the object side surface of the first lens to the folding prism assembly 20 satisfy: -2.49≤f34 / MD≤-0.79.

[0086] By setting the first lens to have a positive optical power and setting the object side surface of the first lens to be a convex surface, it is beneficial for large-angle light to enter the optical system, which is beneficial to improving the field angle of the optical lens and the imaging quality of the optical lens. The light is converged after passing through the first lens, and is matched with a second lens with a positive optical power, and is converged again when passing through the second lens. At the same time, the object side surface of the second lens is set to a convex surface, which is beneficial to further converge the light, and can effectively reduce the height of the rear lens and reduce the difficulty of lens molding; and setting the third lens to have a negative optical power can diffuse the light, which can effectively balance the aberration brought by the front lens and improve the imaging quality. Setting the fourth lens to have a negative optical power and matching it with the third lens with a negative optical power can reduce the degree of light deflection, so that the light transitions smoothly between the lenses, which is beneficial to improving the imaging quality. By setting the first optical component 10, the folding prism component 20 and the second optical component 30, the light is folded multiple times in the folding prism component 20, which can extend the propagation path of the light in the optical lens, thereby helping to improve the focal length of the optical lens, and at the same time limit f34 / MD within a reasonable range, so that the overall deflection degree of the light in the three lenses and the fourth lens can be controlled, the trend of the light in the third lens and the fourth lens can be controlled, and the deflection degree of the light when it is emitted from the image side of the fourth lens can be controlled, which is conducive to the smooth incidence of the light into the folding prism component 20, while meeting the imaging performance of the optical lens, it is conducive to reducing the length of the optical lens along the optical axis direction, and shortening the axial size of the optical lens, thereby helping to achieve miniaturization.

[0087] Optionally, the optical lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0088] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0089] The optical lens in the present application may use multiple lenses, such as the four lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0090] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are described as an example in the embodiments, the optical lens is not limited to including four lenses. If necessary, the optical lens may also include other numbers of lenses.

[0091] The following further describes examples of specific surface shapes and parameters of the optical lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0092] Embodiment 1

[0093] like Figures 1 to 3 As shown, the optical lens of embodiment 1 is described. Figure 1 shows a trend diagram of imaging light in the optical lens in the first embodiment, Figure 2 Shows Figure 1 The folding prism assembly 20, Figure 3 Shows Figure 1 Schematic diagram of the structure of the first optical component 10.

[0094] In the first embodiment, the first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has positive power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave; the fourth lens E4 has negative power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex.

[0095] like Figure 1 and Figure 3 As shown, the imaging light from the object side passes through the first lens E1 to the fourth lens E4, enters the folding prism assembly 20 through the incident surface S11, reaches the second reflecting surface S13 under the reflection effect of the first reflecting surface S12, passes through the first penetrating surface (first stray light total reflection surface) S14 and the second penetrating surface S15 in sequence under the reflection effect of the second reflecting surface S13 to reach the third reflecting surface S16, passes through the third penetrating surface (second stray light total reflection surface) S17 and the fourth penetrating surface S18 in sequence under the reflection effect of the third reflecting surface S16 to reach the fourth reflecting surface S19, the fourth reflecting surface S19 reflects the imaging light to the fifth reflecting surface S20, the fifth reflecting surface S20 reflects the imaging light to the exit surface S21, and the imaging light passes through the object side surface S22 of the filter element and the image side surface S23 of the filter element in sequence to reach the imaging surface S24. The stray light will be totally reflected when passing through the first penetrating surface (first stray light total reflection surface) S14 and the third penetrating surface (second stray light total reflection surface) S17.

[0096] Table 1 shows the basic structural parameters of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0097] Table 1

[0098]

[0099] In the first embodiment, the object side surface and the image side surface of the second lens E2 to the fourth lens E4 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0100] Formula (1)

[0101] Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S3-S8 in Example 1.

[0102] Table 2

[0103]

[0104] Embodiment 2

[0105] like Figures 4 to 6 As shown, the optical lens of the second embodiment is described. Figure 4 The figure shows the trend of imaging light in the optical lens in the second embodiment. Figure 5 Shows Figure 4 The folding prism assembly 20, Figure 6 Shows Figure 4 Schematic diagram of the structure of the first optical component 10.

[0106] In the second embodiment, the first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has positive power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave; the fourth lens E4 has negative power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave.

[0107] Table 3 shows the basic structural parameters of the optical lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0108] Table 3

[0109]

[0110] Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1. In this embodiment, the object side surface and image side surface of the second lens to the fourth lens are all aspherical surfaces.

[0111] Table 4

[0112]

[0113] Embodiment 3

[0114] like Figures 7 to 9 As shown, the optical lens of embodiment 3 is described. Figure 7 shows a trend diagram of imaging light in the optical lens in the third embodiment, Figure 8 Shows Figure 7 The folding prism assembly 20, Fig. 9 Shows Figure 7 Schematic diagram of the structure of the first optical component 10.

[0115] In the third embodiment, the first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has positive power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave; the fourth lens E4 has negative power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex.

[0116] Table 5 shows the basic structural parameters of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0117] Table 5

[0118]

[0119] Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1. In this embodiment, the object side surface and image side surface of the second lens to the fourth lens are all aspherical surfaces.

[0120] Table 6

[0121]

[0122] Embodiment 4

[0123] like Figures 10 to 12 As shown, the optical lens of embodiment 4 is described. Fig.10 The figure shows the trend of the imaging light in the optical lens in the fourth embodiment. Fig.11 Shows Fig.10 The folding prism assembly 20, Fig.12 Shows Fig.10 Schematic diagram of the structure of the first optical component 10.

[0124] In the fourth embodiment, the first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has positive power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is convex. The third lens E3 has negative power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex; the fourth lens E4 has negative power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave.

[0125] Table 7 shows the basic structural parameters of the optical lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0126] Table 7

[0127]

[0128] Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1. In this embodiment, the object side surface and image side surface of the second lens to the fourth lens are all aspherical surfaces.

[0129] Table 8

[0130]

[0131] Embodiment 5

[0132] like Figures 13 to 15 As shown, the optical lens of Example 5 is described. Fig.13 The figure shows the trend of the imaging light in the optical lens in the fifth embodiment. Fig.14 Shows Fig.13 The folding prism assembly 20, Fig.15 Shows Fig.13 Schematic diagram of the structure of the first optical component 10.

[0133] In Embodiment 5, the first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is convex. The second lens E2 has positive power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens E4 has negative power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave.

[0134] Table 9 shows the basic structural parameters of the optical lens of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0135] Table 9

[0136]

[0137] Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1. In this embodiment, the object side surface and image side surface of the second lens to the fourth lens are all aspherical surfaces.

[0138] Table 10

[0139]

[0140] In summary, the optical lenses of Embodiments 1 to 5 respectively satisfy the relationship shown in Table 11.

[0141] Table 11

[0142]

[0143] Table 12 shows the parameters of each lens of the optical lens of Example 1 to Example 5 (unit: mm).

[0144] Table 12

[0145]

[0146] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0147] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0148] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0149] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0150] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical lens, characterized in that: include: A first optical assembly, the first optical assembly comprising a first lens with positive power, a second lens with positive power, a third lens with negative power, and a fourth lens with negative power, which are sequentially arranged along a first optical axis, the object side surface of the first lens being a convex surface, and the object side surface of the second lens being a convex surface; A folding prism assembly, the folding prism assembly is located at the light-emitting side of the first optical assembly, the folding prism assembly is a trapezoidal prism as a whole, and the folding prism assembly has at least one stray light total reflection surface, the stray light total reflection surface is used to reflect the stray light generated in the folding prism assembly and transmit the imaging light; A second optical component, the second optical component is located at the light-emitting side of the prism component, and the second optical component at least includes an imaging surface; The effective focal length f4 of the fourth lens, the thickness M of the trapezoidal prism and the bottom waist angle ɑ of the trapezoidal prism satisfy: -3.77≤f4*tanɑ / M≤-1.

64.

2. The optical lens according to claim 1, characterized in that: The folding prism assembly has an incident surface, multiple reflection surfaces and an exit surface in sequence along the direction of the light path, and there is at least one stray light total reflection surface between the multiple reflection surfaces. The stray light total reflection surface is used to reflect the stray light generated in the folding prism assembly and pass the imaging light.

3. The optical lens according to claim 2, characterized in that: There is at least a first stray light total reflection surface and a second stray light total reflection surface between the multiple reflection surfaces, and the distance between the first stray light total reflection surface and the second stray light total reflection surface gradually increases toward a side away from the plane where the incident surface is located.

4. The optical lens according to claim 3, characterized in that: A first angle β1 is formed between the first stray light total reflection surface and the incident surface, and the first angle β1 is greater than or equal to 30° and less than or equal to 47°.

5. The optical lens according to claim 3, characterized in that: A second angle β2 is formed between the second stray light total reflection surface and the incident surface, and the second angle β2 is greater than or equal to 133° and less than or equal to 150°.

6. The optical lens according to claim 3, characterized in that: A first angle β1 is formed between the first stray light total reflection surface and the incident surface, a second angle β2 is formed between the second stray light total reflection surface and the incident surface, and the first angle β1 is complementary to the second angle β2.

7. The optical lens according to claim 3, characterized in that: The return prism assembly includes, in order along the optical path: the incident surface, the first reflection surface, the second reflection surface, the first penetration surface, the second penetration surface, the third reflection surface, the third penetration surface, the fourth penetration surface, the fourth reflection surface, the fifth reflection surface and the exit surface, wherein the first penetration surface and the second penetration surface are spaced apart to form a first interval, the third penetration surface and the fourth penetration surface are spaced apart to form a second interval, the first penetration surface serves as the first stray light total reflection surface, and the third penetration surface serves as the second stray light total reflection surface.

8. The optical lens according to claim 7, characterized in that: The folding prism assembly includes a first prism, a second prism and a third prism arranged in sequence, the first prism and the second prism have the first interval between them, the second prism and the third prism have the second interval between them, and a connecting adhesive layer is provided at the first interval and the second interval.

9. The optical lens according to any one of claims 1 to 8, characterized in that: The first optical component has a first optical axis, the second optical component has a second optical axis, the first optical axis is parallel to the second optical axis, and a distance t between the first optical axis and the second optical axis is greater than or equal to 21.39 mm and less than or equal to 29.50 mm.

10. The optical lens according to any one of claims 1 to 8, characterized in that: The length L of the equivalent flat plate of the optical lens and the distance TD from the object side surface of the first lens closest to the object side to the image side surface of the last lens closest to the image side on the optical axis of the optical lens satisfy: 4.69≤L / TD≤5.

56.

11. The optical lens according to any one of claims 1 to 8, characterized in that: An effective focal length f1 of the first lens, a center thickness CT1 of the first lens on the first optical axis, and a refractive index N1 of the first lens satisfy the following: 3.93≤f1 / (CT1*N1)≤7.

56.

12. The optical lens according to any one of claims 1 to 8, characterized in that: A curvature radius R3 of the object side surface of the second lens, a center thickness CT3 of the third lens on the first optical axis, and an air gap T34 between the third lens and the fourth lens on the first optical axis satisfy the following: 2.66≤R3 / (CT3+T34)≤11.

77.

13. The optical lens according to any one of claims 1 to 8, characterized in that: An air interval T34 between the third lens and the fourth lens on the optical axis, an air interval T12 between the first lens and the second lens on the optical axis, and an air interval T23 between the second lens and the third lens on the optical axis satisfy the following: 0.95≤T34 / (T12+T23)≤9.

82.

14. The optical lens according to any one of claims 1 to 8, characterized in that: The combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy the following: 2.53≤f12 / (CT1+CT2)≤3.

67.

15. The optical lens according to any one of claims 1 to 8, characterized in that: The on-axis distance SAG11 between the intersection of the object side surface of the first lens and the first optical axis to the effective radius vertex of the object side surface of the first lens, and the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the first optical axis to the effective radius vertex of the image side surface of the second lens satisfy: 1.34≤(SAG11+SAG22) / (SAG11-SAG22)≤4.

33.

16. The optical lens according to any one of claims 1 to 8, characterized in that: The Abbe number V2 of the second lens is greater than the Abbe number V3 of the third lens.

17. The optical lens according to any one of claims 1 to 8, characterized in that: A combined focal length f34 of the third lens and the fourth lens and a curvature radius R8 of the image side surface of the fourth lens satisfy the following: 1.09≤|f34 / R8|≤3.

02.

18. The optical lens according to any one of claims 1 to 8, characterized in that: The first optical component has a first optical axis, the second optical component has a second optical axis, the first optical axis is parallel to the second optical axis, and the distance t between the first optical axis and the second optical axis and the refractive index n of the folding prism component satisfy: 14.07mm≤t / n≤19.41mm.

Images