Optical lens

Abstract

The present invention provides an optical lens. The optical lens includes: a first optical component, the first optical component includes a first lens to a fourth lens 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 component, the folding prism component is located on the light-emitting 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-emitting side of the prism component, 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 base waist angle ɑ of the trapezoidal prism satisfy: -3.77 ≤ f4 * tanɑ / M ≤ -1.64. The present invention solves the problem that in the prior art, a telephoto optical lens with a large focal length is prone to internal reflection prism ghost images while meeting miniaturization requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and more particularly, to an optical lens. Background Art

[0002] With the development of electronic products, the imaging system plays a crucial role in electronic products. Users have an increasing demand for the camera function of electronic products, requiring electronic devices to meet diversified photography needs. As electronic products are developing towards miniaturization, optical lenses also need to develop in the direction of miniaturization synchronously. In particular, in order to meet the imaging requirements of the optical lens while reducing the size, a catadioptric prism assembly is often used in long-focus optical lenses. However, internal reflection prism ghosts are likely to be generated inside the catadioptric prism assembly, affecting the imaging quality of the optical lens.

[0003] That is to say, in the prior art, long-focus optical lenses with large focal lengths are prone to the problem of internal reflection prism ghosts while meeting the requirement of miniaturization. Summary of the Invention

[0004] The main object of the present invention is to provide an optical lens to solve the problem that long-focus optical lenses with large focal lengths in the prior art are prone to internal reflection prism ghosts while meeting the requirement of miniaturization.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an optical lens, including: a first optical component, the first optical component includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a negative optical power arranged in sequence along a first optical axis. The object side surface of the first lens is convex, and the object side surface of the second lens is convex; a catadioptric prism assembly, the catadioptric prism assembly is located on the light-emitting side of the first optical component, the catadioptric prism assembly as a whole is a trapezoidal prism, and the catadioptric prism assembly has at least one stray light total reflection surface for reflecting the stray light generated inside the catadioptric prism assembly and transmitting 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 base 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 includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a negative optical power arranged in sequence along a first optical axis. The object side surface of the first lens is convex, and the object side surface of the second lens is convex; a folding prism component, the folding prism component is located on the light-emitting side of the first optical component, and 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-emitting 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 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 in the optical lens satisfy: 4.69 ≤ L / TD ≤ 5.56; the combined focal length f34 of the third lens and the fourth lens and the radius of curvature 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 includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a negative optical power arranged in sequence along a first optical axis. The object side surface of the first lens is convex, and the object side surface of the second lens is convex; a folding prism component, the folding prism component is located on the light-emitting side of the first optical component, and 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-emitting side of the prism component, 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 component satisfy: -2.49 ≤ f34 / MD ≤ -0.79.

[0008] Further, the folding prism component sequentially has an incident surface, a plurality of reflection surfaces, and an exit surface along the optical path direction. There is at least one stray light total reflection surface between the plurality of reflection surfaces. The stray light total reflection surface is used for reflecting the stray light generated inside the folding prism component and transmitting the imaging light.

[0009] Further, there are at least a first stray light total reflection surface and a second stray light total reflection surface between the plurality of reflection surfaces. 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.

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

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

[0012] Further, there is a first included angle β1 between the first stray light total reflection surface and the incident surface, and there is a second included angle β2 between the second stray light total reflection surface and the incident surface, and the first included angle β1 and the second included angle β2 are complementary.

[0013] Further, the folding prism assembly sequentially includes, 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. Among them, 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.

[0014] Further, the folding prism assembly includes a first prism, a second prism, and a third prism arranged in sequence. There is a first interval between the first prism and the second prism, and there is a second interval between the second prism and the third prism. A connecting adhesive layer is provided at 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 and the second optical axis are parallel, 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.

[0016] Further, 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.

[0017] Further, the effective focal length f1 of the first lens, the central 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.

[0018] Further, the curvature radius R3 of the object side surface of the second lens, the central 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.

[0019] Furthermore, the air space T34 between the third lens and the fourth lens on the optical axis, the air spaces T12 between the first lens and the second lens on the optical axis, and 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 central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 2.53 ≤ f12 / (CT1 + CT2) ≤ 3.67.

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

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

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

[0024] Furthermore, the first lens has a positive optical power, and the object side surface of the first lens is convex; the second lens has a positive optical power, and the object side surface of the second lens is convex; the third lens has a 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 assembly satisfy: 14.07 mm ≤ t / n ≤ 19.41 mm.

[0026] Applying the technical solution of the present invention, the optical lens includes a first optical component, a folding prism component and a second optical component. The first optical component includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power and a fourth lens with a negative optical power arranged in sequence along the first optical axis. The object side of the first lens is convex, and the object side of the second lens is convex; 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, and the whole of the folding prism component is a trapezoidal prism. The second optical component is located on the light-emitting side of the prism component, 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.

[0027] By setting the first lens to have a positive optical power and the object side of the first lens to be convex, it is beneficial for large-angle light to enter the optical system, which is conducive to improving the field of view angle of the optical lens and the imaging quality of the optical lens. After the light passes through the first lens, it is converged. When paired with the second lens with a positive optical power, it is converged again when passing through the second lens. At the same time, the object side of the second lens is set to be convex, which is beneficial for further converging the light, and can effectively reduce the height of the light passing through the rear lens and reduce the forming difficulty of the lens; while setting the third lens to have a negative optical power can diffuse the light, effectively balance the aberration brought by the front lens, and improve the imaging quality. And setting the fourth lens to have a negative optical power and pairing it with the third lens with a negative optical power can slow down the deflection degree of the light, making the light transition smoothly between the lenses, which is beneficial to improving the imaging quality. By setting the first optical component, the folding prism component and the second optical component, the light can be refolded multiple times in the folding prism component, which can extend the propagation path of the light in the optical lens, and is thus conducive to increasing the focal length of the optical lens. At the same time, by limiting the range of f4 * tanɑ / M, the thickness of the folding prism component can be controlled within a reasonable range, which is beneficial to the miniaturization of the optical lens, and at the same time ensures that the light emitted from the fourth lens can smoothly enter the folding prism component and can be refolded multiple times in the folding prism component, so that the optical lens can meet both long focal length and miniaturization at the same time. Description of the Drawings

[0028] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic 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 shows a schematic structural diagram of the optical lens according to Embodiment 1 of the present invention;

[0030] Figure 2 shows Figure 1Schematic structural diagram of the middle folding prism assembly;

[0031] Figure 3 Shows Figure 1 Schematic structural diagram of the first optical component in the middle;

[0032] Figure 4 Schematic structural diagram of the optical lens according to the second embodiment of the present invention;

[0033] Figure 5 Shows Figure 4 Schematic structural diagram of the middle folding prism assembly;

[0034] Figure 6 Shows Figure 4 Schematic structural diagram of the first optical component in the middle;

[0035] Figure 7 Schematic structural diagram of the optical lens according to the third embodiment of the present invention;

[0036] Figure 8 Shows Figure 7 Schematic structural diagram of the middle folding prism assembly;

[0037] Figure 9 Shows Figure 7 Schematic structural diagram of the first optical component in the middle;

[0038] Figure 10 Schematic structural diagram of the optical lens according to the fourth embodiment of the present invention;

[0039] Figure 11 Shows Figure 10 Schematic structural diagram of the middle folding prism assembly;

[0040] Figure 12 Shows Figure 10 Schematic structural diagram of the first optical component in the middle;

[0041] Figure 13 Schematic structural diagram of the optical lens according to the fifth embodiment of the present invention;

[0042] Figure 14 Shows Figure 13 Schematic structural diagram of the middle folding prism assembly;

[0043] Figure 15 Shows Figure 13 Schematic structural diagram of the first optical component in the middle;

[0044] Figure 16 Schematic diagram of the transmission optical path of stray light inside the folding prism assembly according to an alternative embodiment of the present invention;

[0045] Figure 17 Shows havingFigure 16 Stray light distribution diagram of the optical lens of the folding prism assembly shown

[0046] Figure 18 Shows the transmission optical path diagram of stray light in the folding prism assembly in an example

[0047] Figure 19 Shows having Figure 18 Stray light distribution diagram of the optical lens of the folding prism assembly shown

[0048] Wherein, the above-mentioned drawings include the following reference numerals

[0049] 10. First optical component; 20. Folding prism assembly; 21. First prism; 22. Second prism; 23. Third prism; E1. First lens; E2. Second lens; E3. Third lens; E4. Fourth lens; S1. Object side of the first lens; S2. Image side of the first lens; S3. Object side of the second lens; S4. Image side of the second lens; S5. Object side of the third lens; S6. Image side of the third lens; S7. Object side of the fourth lens; S8. Image side of the fourth lens; S11. Incident surface; S12. First reflection surface; S13. Second reflection surface; S14. First penetration surface (first total reflection surface of stray light); S15. Second penetration surface; S16. Third reflection surface; S17. Third penetration surface (second total reflection surface of stray light); S18. Fourth penetration surface; S19. Fourth reflection surface; S20. Fifth reflection surface; S21. Exit surface; S22. Object side of the filter element; S23. Image side of the filter element; S24. Imaging surface; 30. Second optical component Detailed implementation manners

[0050] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments

[0051] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs

[0052] In the present invention, unless otherwise stated, the orientation words such as "upper, lower, top, bottom" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inside, outside" refer to the inside and outside relative to the contour of each component itself, but the above orientation words do not limit the present invention

[0053] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings 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, for the sake of clarity, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0055] In this text, the paraxial region refers to the region 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 region; 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 region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in the field, and the sign of the R value (R refers to the radius of curvature of the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge the convexity and concavity. Taking the object side surface as an example, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; taking the image side surface as an example, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex. In the present application, the left side is the object side and the right side is the image side.

[0056] In order to solve the problem that in the prior art, a long-focus optical lens with a large focal length is prone to generating internal reflection prism ghosts while meeting miniaturization requirements, the present invention provides an optical lens.

[0057] As Figures 1 to 17 shown, the optical lens includes a first optical component 10, a folding prism component 20, and a second optical component 30. The first optical component 10 includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a negative optical power arranged in sequence along a first optical axis. The object side surface of the first lens is convex, and the object side surface of the second lens is convex; the folding prism component 20 is located on the light-emitting side of the first optical component 10; the folding prism component 20 is located on the light-emitting side of the first optical component 10, and the folding prism component 20 is an overall trapezoidal prism. There is at least one stray light total reflection surface in the folding prism component, and the stray light total reflection surface is used to reflect the stray light generated in the folding prism component and transmit 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 at least includes an imaging surface; among them, the effective focal length f4 of the fourth lens, the thickness M of the trapezoidal prism, and the base waist angle ɑ of the trapezoidal prism satisfy: -3.77 ≤ f4 * tan ɑ / M ≤ -1.64.

[0058] By setting the first lens to have a positive optical power and the object side of the first lens to be convex, it is beneficial for light at large angles to enter the optical system. Furthermore, it is beneficial for increasing the field of view angle of the optical lens and improving the imaging quality of the optical lens. After passing through the first lens, the light is converged. When paired with the second lens having a positive optical power, the light is converged again when passing through the second lens. At the same time, the object side of the second lens is set to be convex, which is beneficial for further converging the light, and can effectively reduce the height of the light passing through the rear lens and reduce the forming difficulty of the lens. By setting the third lens to have a negative optical power, it can diffuse the light, effectively balancing the aberration brought by the front lens and improving the imaging quality. By setting the fourth lens to have a negative optical power and pairing it with the third lens having a negative optical power, it can slow down the degree of light deflection, enabling the light to transition smoothly between the lenses, which is beneficial for improving the imaging quality. By setting the first optical component 10, the folding prism component 20, and the second optical component 30, the light can be folded multiple times within the folding prism component 20, extending the propagation path of the light in the optical lens. Furthermore, it is beneficial for increasing the focal length of the optical lens. At the same time, by restricting the range of f4*tanɑ / M, the thickness of the folding prism component 20 can be controlled within a reasonable range, which is beneficial for the miniaturization of the optical lens, and at the same time ensures that the light emerging from the fourth lens can smoothly enter the folding prism component 20 and can be folded multiple times within the folding prism component 20, making the optical lens miniaturized at the same time. By setting a stray light total reflection surface within the prism, the stray light generated within the folding prism component 20 can be reflected, preventing the stray light from following the imaging light into the rear optical system, and thus effectively reducing the ghost images within the folding prism component 20.

[0059] It should be noted that the folding prism component 20 being a trapezoidal prism as a whole means that the cross-section of the folding prism component 20 in the direction parallel to the first plane is trapezoidal. In some alternative embodiments, the folding prism component 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 alternative embodiments, the folding prism component 20 sequentially has an incident surface, a plurality of reflection surfaces, and an exit surface along the optical path. There is at least one stray light total reflection surface between the plurality of reflection surfaces. The stray light total reflection surface is used to reflect the stray light generated within the folding prism component 20 and transmit the imaging light. The imaging light emitted from the first optical component 10 enters the folding prism component 20 through the incident surface, is reflected between the plurality of reflection surfaces, and exits through the exit surface. The light after exiting enters the second optical component 30. As the focal length and aperture of the optical lens increase, internal reflection prism ghost images are likely to be generated within the folding prism component 20. By setting a stray light total reflection surface within the prism, the stray light generated within the folding prism component 20 can be reflected, preventing the stray light from following the imaging light into the rear optical system, and thus effectively reducing the ghost images within the folding prism component 20.

[0061] Figure 16 Shows the stray light transmission diagram inside the folding prism assembly 20 in an alternative embodiment of the present application. Figure 17 For the optical lens equipped with Figure 16 the stray light diagram of the folding prism assembly 20 in Figure 18 Shows the stray light transmission diagram inside the folding prism assembly 20 in an example. Figure 19 For the optical lens equipped with Figure 18 the folding prism assembly 20 in Figure 16 As shown, inside the folding prism assembly 20, after passing through the first stray light total reflection surface, the stray light undergoes total reflection and does not enter the exit surface. From Figure 17 the shown stray light diagram, the optical lens equipped with Figure 16 the folding prism assembly 20 shown has no obvious ghost image. As Figure 18 shown, the stray light refracts and reflects inside the folding prism assembly 20 and exits from the light exit surface, affecting the imaging quality of the optical lens. From Figure 19 the shown stray light diagram, the optical lens equipped with Figure 18 the folding prism assembly 20 in

[0062] In some alternative embodiments, there are at least a first stray light total reflection surface and a second stray light total reflection surface between multiple reflection surfaces, and the distance between the first stray light total reflection surface and the second stray light total reflection surface gradually increases towards the side away from the plane where the incident surface is located. By setting the first stray light total reflection surface and the second stray light total reflection surface, the reflection efficiency of stray light can be improved, further reducing the entry of stray light into the rear optical system. At the same time, by making the tilting directions of the first stray light total reflection surface and the second stray light total reflection surface different, stray light with different incident angles can be reflected to improve the stray light reflection efficiency, and thus stray light can be effectively reduced.

[0063] In some alternative embodiments, there is a first included angle β1 between the first stray light total reflection surface and the incident surface, and the first included angle β1 is greater than or equal to 30° and less than or equal to 47°. By limiting the first included angle β1 within the range of 30° to 47°, the stray light inside the folding prism assembly 20 can satisfy the reflection law when passing through the first stray light total reflection surface, so as to undergo total reflection, reduce the entry of stray light into the rear optical system, and achieve the elimination of the stray light inside the folding prism assembly 20.

[0064] In some alternative embodiments, there is a second included angle β2 between the second stray light total reflection surface and the incident surface, and the second included angle β2 is greater than or equal to 133° and less than or equal to 150°. By limiting the second included angle β2 within the range of 133° to 150°, the reflected stray light within the folding prism assembly 20 can satisfy the law of reflection when passing through the second stray light total reflection surface, thereby undergoing total reflection, reducing the entry of stray light into the rear optical system, and achieving the elimination of the reflected stray light within the folding prism assembly 20.

[0065] In some alternative embodiments, there is a first included angle β1 between the first stray light total reflection surface and the incident surface, and a second included angle β2 between the second stray light total reflection surface and the incident surface, and the first included angle β1 and the second included angle β2 are complementary. By setting the first included angle β1 and the second included angle β2 to be complementary, it is beneficial to the fabrication of the folding prism assembly 20 and reduces the processing difficulty of the folding prism assembly 20.

[0066] In some alternative embodiments, the folding prism assembly 20 sequentially includes, along the optical path: an incident surface, a first reflection surface, a second reflection surface, a first through surface, a second through surface, a third reflection surface, a third through surface, a fourth through surface, a fourth reflection surface, a fifth reflection surface, and an exit surface. Among them, the first through surface and the second through surface are spaced apart to form a first gap, the third through surface and the fourth through surface are spaced apart to form a second gap, the first through surface serves as the first stray light total reflection surface, and the third through surface serves as the second stray light total reflection surface. The imaging light can pass through the first through surface, the second through surface, the third through surface, and the fourth through surface to enter the rear optical system, while the reflected stray light within the folding prism undergoes total reflection when passing through the first through surface (the first stray light total reflection surface) and the third through surface (the second stray light total reflection surface), so as to reduce the stray light entering the rear optical system and improve the imaging quality of the optical lens.

[0067] In some alternative embodiments, the folding prism assembly 20 includes a first prism 21, a second prism 22, and a third prism 23 arranged in sequence. There is a first gap between the first prism 21 and the second prism 22, and a second gap between the second prism 22 and the third prism 23. A connecting adhesive layer is provided at the first gap and the second gap. The folding prism assembly 20 is composed of the first prism 21, the second prism 22, and the third prism 23. The surface where the first prism 21 and the second prism 22 are connected serves as the first stray light total reflection surface, and the surface where the second prism 22 and the third prism 23 are connected serves as the second stray light total reflection surface. Such a setting facilitates the fabrication of the folding prism assembly 20 and reduces the processing difficulty of 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 alternative 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 alternative embodiments, the first prism 21, the second prism 22, and the third prism 23 are all isosceles trapezoids.

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

[0071] In some alternative 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 restricting the distance between the first optical axis and the second optical axis, the radial dimension of the optical lens can be ensured, space can be reserved for matching with the whole machine, which is beneficial to the miniaturization of the optical lens.

[0072] In some alternative embodiments, the following relationship is satisfied between 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: 4.69 ≤ L / TD ≤ 5.56. By restricting 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 direction, beneficial to shortening the axial dimension of the optical lens, and thus beneficial to the 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 within the folding prism assembly.

[0074] In some alternative embodiments, the following relationship is satisfied among the effective focal length f1 of the first lens, the central thickness CT1 of the first lens on the first optical axis, and the refractive index N1 of the first lens: 3.93 ≤ f1 / (CT1*N1) ≤ 7.56. By restricting f1 / (CT1*N1) within a reasonable range, the deflection angle of light when passing through the first lens can be controlled, which is beneficial to the incidence of large-angle light to the optical lens. At the same time, when the first lens satisfies the above relationship, the telephoto characteristics can be met. 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 and low-temperature environments.

[0075] In some alternative embodiments, the radius of curvature R3 of the object side surface of the second lens, the central thickness CT3 of the third lens on the first optical axis, and the air gap 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 surface of the second lens can be controlled, facilitating the smooth entry of the light emitted from the second lens into the subsequent optical system. At the same time, by controlling the central thickness of the third lens and the air gap between the third lens and the fourth lens, it is beneficial to control the shape of the third lens, reducing the molding difficulty of the third lens while ensuring that the third lens smoothly receives the light emitted from the second lens. Also, ensuring that the third lens and the spacing between the third lens and the fourth lens are within a reasonable range is conducive to further miniaturization of the optical lens.

[0076] In some alternative embodiments, the air gap T34 between the third lens and the fourth lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the air gap 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 gap between the first lens and the fourth lens can be ensured, which is beneficial to reducing the size of the optical lens in the first optical axis direction and conducive to further miniaturization of the optical lens, reserving space for cooperation with the whole machine.

[0077] In some alternative embodiments, the combined focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens on the optical axis, and the central 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 beneficial to control the transmission path of the light between the first lens and the second lens, control the deflection angle of the light on the first lens and the second lens, ensure that the optical lens reduces aberration while meeting the telephoto performance, and improve the imaging quality of the optical lens.

[0078] In some alternative embodiments, the axial distance SAG11 between the intersection point of the object side surface of the first lens and the first optical axis and the vertex of the effective radius of the object side surface of the first lens, and the axial distance SAG22 between the intersection point of the image side surface of the second lens and the first optical axis and the vertex of the effective radius of the image side surface of the second lens satisfy: 1.34 ≤ (SAG11 + SAG22) / (SAG11 - SAG22) ≤ 4.33. By restricting (SAG11 + SAG22) / (SAG11 - SAG22) within a reasonable range, it is beneficial to control the shapes of the object side surface of the first lens and the image side surface of the second lens. While reducing the molding difficulty of the first lens and the second lens, it ensures the deflection angle of the light when it enters the first lens and the deflection angle when it exits the second lens, which is beneficial to controlling the transmission path of the light in the first lens and the second lens, and further facilitating the control of the imaging quality of the optical lens.

[0079] In some alternative 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, and the imaging quality of the optical imaging lens can be improved.

[0080] In some alternative embodiments, the combined focal length f34 of the third lens and the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 1.09 ≤ |f34 / R8| ≤ 3.02. By restricting |f34 / R8| within a reasonable range, the overall deflection degree of the light in the third lens and the fourth lens can be controlled, the light path of the light in the third lens and the fourth lens can be controlled, and at the same time, the deflection degree of the light when it exits from the image side surface of the fourth lens can be controlled, which is beneficial to the light entering the folding prism assembly 20 smoothly. While meeting the long focal length performance requirements of the optical lens, the imaging quality of the optical lens is improved. In addition, the shape of the fourth lens can be controlled, the molding difficulty of the fourth lens can be reduced, and the yield rate of the fourth lens can be increased.

[0081] In some alternative 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: 14.07 mm ≤ t / n ≤ 19.41 mm. By restricting t / n within a reasonable range, it is helpful for multiple reflections, ensuring that the size of the folding prism assembly matched with the optical lens with a larger focal length is smaller, thereby reducing the size of the optical module, enabling the optical lens to meet the miniaturization requirements, and being beneficial to the optical lens to achieve miniaturization while meeting the long focal length performance requirements.

[0082] In some alternative embodiments, the second optical component 30 may further include a filter element and / or a protection element. Of course, it may also include a lens with a focal power, and no specific limitation is made here.

[0083] In another aspect, in another alternative embodiment of the present application, the optical lens includes: a first optical component 10, the first optical component 10 includes a first lens with a positive focal power, a second lens with a positive focal power, a third lens with a negative focal power, and a fourth lens with a negative focal power arranged in sequence along the first optical axis. The object side surface of the first lens is convex, and the object side surface of the second lens is convex; a folding prism assembly 20, the folding prism assembly 20 is located on the light-emitting side of the first optical component 10, the folding prism assembly 20 is an overall trapezoidal prism, 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 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 radius of curvature 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 the object side of the first lens to be convex, it is beneficial for light at large angles to enter the optical system, which in turn is beneficial for increasing the field of view angle of the optical lens and improving the imaging quality of the optical lens. After passing through the first lens, the light is converged. When combined with the second lens having a positive optical power, the light is converged again when passing through the second lens. At the same time, the object side of the second lens is set to be convex, which is beneficial for further converging the light, and can effectively reduce the height of the light passing through the rear lens and the forming difficulty of the lens. By setting the third lens to have a negative optical power, the light can be diffused, which can effectively balance the aberration brought by the front lens and improve the imaging quality. By setting the fourth lens to have a negative optical power and combining it with the third lens having a negative optical power, the degree of light deflection can be reduced, enabling the light to transition smoothly between the lenses, which is beneficial for improving the imaging quality. By setting the first optical component 10, the folding prism component 20, and the second optical component 30, the light can be folded multiple times within the folding prism component 20, which can extend the propagation path of the light in the optical lens, thereby being beneficial for increasing the focal length of the optical lens. At the same time, by limiting L / TD and |f34 / R8| within a reasonable range, the overall degree of light deflection within the three-lens and the fourth lens can be controlled, the trend of the light within the third lens and the fourth lens can be controlled, and the degree of light deflection when the light exits from the image side of the fourth lens can be controlled, which is beneficial for the light to enter the folding prism component 20 smoothly, improving the imaging quality of the optical lens while meeting the long focal length performance of the optical lens. At the same time, the overall size of the optical lens is controlled, which is beneficial for reducing the length of the optical lens along the optical axis while ensuring the imaging performance of the optical lens, shortening the axial size of the optical lens, and thus being beneficial for the optical lens to achieve miniaturization. In addition, the shape of the fourth lens can be controlled, reducing the forming difficulty of the fourth lens and increasing the yield rate of the fourth lens.

[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 a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a negative optical power arranged in sequence along the first optical axis. The object side of the first lens is convex, and the object side of the second lens is convex; a folding prism component 20, the folding prism component 20 is located on the light output side of the first optical component 10, and the folding prism component 20 is an overall trapezoidal prism, and a second optical component 30, the second optical component 30 is located on the light output side of the prism component, 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 of the first lens to the folding prism component 20 satisfy: -2.49 ≤ f34 / MD ≤ -0.79.

[0086] By setting the first lens to have a positive optical power and the object side of the first lens to be convex, it is beneficial for large-angle light to enter the optical system, which in turn is beneficial for increasing the field of view angle of the optical lens and improving the imaging quality of the optical lens. After passing through the first lens, the light is converged. When paired with the second lens having a positive optical power, the light is converged again when passing through the second lens. At the same time, the object side of the second lens is set to be convex, which is beneficial for further converging the light, and can effectively reduce the height of the light passing through the rear lens and reduce the molding difficulty of the lens. By setting the third lens to have a negative optical power, the light can be diffused, which can effectively balance the aberration brought by the front lens and improve the imaging quality. By setting the fourth lens to have a negative optical power and pairing it with the third lens having a negative optical power, the degree of light deflection can be slowed down, enabling the light to transition smoothly between the lenses, which is beneficial for improving the imaging quality. By setting the first optical component 10, the folding prism component 20, and the second optical component 30, the light can be folded multiple times within the folding prism component 20, which can extend the propagation path of the light in the optical lens, thereby being beneficial for increasing the focal length of the optical lens. At the same time, by limiting f34 / MD within a reasonable range, the overall degree of light deflection within the third lens and the fourth lens can be controlled, the trend of the light within the third lens and the fourth lens can be controlled, and the degree of light deflection when the light exits from the image side of the fourth lens can be controlled, which is beneficial for the light to enter the folding prism component 20 smoothly. While meeting the imaging performance of the optical lens, it is beneficial for reducing the length of the optical lens along the optical axis direction, shortening the axial size of the optical lens, and thus being beneficial for realizing miniaturization.

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

[0088] Of course, other parameters in the above embodiments may also be included in this embodiment, which will not be elaborated one by one here.

[0089] In the optical lens of the present application, multiple lenses may be used, such as the four lenses described above. In the present application, at least one of the lens surfaces of each lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0090] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this 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, with reference to the accompanying drawings, examples of the specific surface shapes and parameters of the optical lens applicable to the above embodiments.

[0092] Embodiment 1

[0093] As Figures 1 to 3 shown, the optical lens of Embodiment 1 is described. Figure 1 The figure shows the trend chart of the imaging light rays inside the optical lens in Embodiment 1, Figure 2 which shows Figure 1 the folding prism assembly 20 in Figure 3 and shows Figure 1 the structural schematic diagram of the first optical assembly 10 in

[0094] In Embodiment 1, the first lens E1 has a positive optical 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 a positive optical 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 a negative optical 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 a negative optical 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] As Figure 1 and Figure 3 shown, the imaging light rays from the object side pass through the first lens E1 to the fourth lens E4, enter the folding prism assembly 20 through the incident surface S11, reach the second reflecting surface S13 under the reflection of the first reflecting surface S12, and then pass through the first penetration surface (the first stray light total reflection surface) S14 and the second penetration surface S15 in sequence to reach the third reflecting surface S16 under the reflection of the second reflecting surface S13. Under the reflection of the third reflecting surface S16, they pass through the third penetration surface (the second stray light total reflection surface) S17 and the fourth penetration surface S18 in sequence to reach the fourth reflecting surface S19. The fourth reflecting surface S19 reflects the imaging light rays to the fifth reflecting surface S20, and the fifth reflecting surface S20 reflects the imaging light rays to the exit surface S21. The imaging light rays reach the imaging surface S24 after passing through the object side surface S22 and the image side surface S23 of the filter element in sequence. Among them, the stray light will undergo total reflection when passing through the first penetration surface (the first stray light total reflection surface) S14 and the third penetration surface (the second stray light total reflection surface) S17.

[0096] Table 1 shows the basic structural parameter table of the optical lens in the first embodiment. Among them, the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0097] Table 1

[0098]

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

[0100] Formula (1)

[0101] Where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is at a position with 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 radius of curvature R in Table 1 above; k is the conic constant; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 that can be used for each aspherical mirror surface S3 - S8 in the first embodiment.

[0102] Table 2

[0103]

[0104] Second Embodiment

[0105] As Figures 4 to 6 shown, the optical lens of the second embodiment is described. Figure 4 shows the trend chart of the imaging light rays in the optical lens in the second embodiment, Figure 5 shows Figure 4 the folding prism assembly 20 in Figure 6 shows Figure 4 the structural schematic diagram of the first optical component 10 in

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

[0107] Table 3 shows the basic structural parameter table of the optical lens in the second embodiment. Among them, the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0108] Table 3

[0109]

[0110] Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in the second embodiment. Among them, each aspherical surface type can be defined by the formula (1) given in the first embodiment above. In this embodiment, the object side and the image side of the second lens to the fourth lens are both aspherical surfaces.

[0111] Table 4

[0112]

[0113] Embodiment Three

[0114] As Figures 7 to 9 shown, the optical lens of Embodiment Three is described. Figure 7 shows the trend chart of the imaging light rays in the optical lens of Embodiment Three, Figure 8 shows Figure 7 the folding prism assembly 20 in Figure 9 shows Figure 7 the structural schematic diagram of the first optical component 10 in

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

[0116] Table 5 shows the basic structural parameter table of the optical lens of Embodiment Three, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0117] Table 5

[0118]

[0119] Table 6 shows the high-order term coefficients that can be used for each aspherical mirror surface in Embodiment Three. Among them, each aspherical surface type can be defined by the formula (1) given in the first embodiment above. In this embodiment, the object side and the image side of the second lens to the fourth lens are both aspherical surfaces.

[0120] Table 6

[0121]

[0122] Embodiment Four

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

[0124] In Example 4, the first lens E1 has positive power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative power, with its object-side surface S7 being convex and its image-side surface S8 being concave.

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

[0126] Table 7

[0127]

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

[0129] Table 8

[0130]

[0131] Example 5

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

[0133] In Embodiment 5, the first lens E1 has a positive optical 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 a positive optical 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 a negative optical 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 a negative optical 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 parameter table of the optical lens of Embodiment 5, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0135] Table 9

[0136]

[0137] Table 10 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in each of Embodiment 5. Among them, each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above. In this embodiment, the object side surfaces and the image side surfaces 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 relationships shown in Table 11.

[0141] Table 11

[0142]

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

[0144] Table 12

[0145]

[0146] This application also provides an imaging device, and its electronic photosensitive element can be a charge-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 on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0147] Obviously, the embodiments described above are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope 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 forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify 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 description, claims and drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances 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 are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An optical lens, characterized in that, Comprising: A first optical component, the first optical component including a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a negative optical power arranged sequentially along a first optical axis. The object side surface of the first lens is convex, and the object side surface of the second lens is convex; A folding prism component, the folding prism component being located on the light-emitting side of the first optical component. The folding prism component is an overall trapezoidal prism, and there is at least one stray light total reflection surface inside the folding prism component. The stray light total reflection surface is used to reflect the stray light generated inside the folding prism component and transmit the imaging light; A second optical component, the second optical component being located on the light-emitting side of the prism component. 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 base waist angle ɑ of the trapezoidal prism satisfy: -3.77 ≤ f4 * tan ɑ / M ≤ -1.64; The effective focal length f1 of the first lens, the central 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.

2. The optical lens according to claim 1, characterized in that The folding prism component sequentially has an incident surface, a plurality of reflection surfaces, and an exit surface along the optical path. There is at least one stray light total reflection surface between the plurality of reflection surfaces. The stray light total reflection surface is used to reflect the stray light generated inside the folding prism component and transmit the imaging light.

3. The optical lens according to claim 2, characterized in that, There are at least a first stray light total reflection surface and a second stray light total reflection surface between the plurality of reflection surfaces. 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.

4. The optical lens according to claim 3, wherein There is a first included angle β1 between the first stray light total reflection surface and the incident surface. The first included angle β1 is greater than or equal to 30° and less than or equal to 47°.

5. The optical lens according to claim 3, wherein There is a second included angle β2 between the second stray light total reflection surface and the incident surface. The second included angle β2 is greater than or equal to 133° and less than or equal to 150°.

6. The optical lens according to claim 3, wherein There is a first included angle β1 between the first stray light total reflection surface and the incident surface, and a second included angle β2 between the second stray light total reflection surface and the incident surface. The first included angle β1 and the second included angle β2 are complementary.

7. The optical lens according to claim 3, characterized in that, The folding prism component sequentially includes along the optical path: the 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 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, wherein The folding prism assembly includes a first prism, a second prism, and a third prism arranged in sequence. There is a first gap between the first prism and the second prism, and a second gap between the second prism and the third prism. A connecting adhesive layer is provided at the first gap and the second gap.

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, and 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 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 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.

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

77.

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

82.

13. 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 central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 2.53 ≤ f12 / (CT1 + CT2) ≤ 3.

67.

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

33.

15. 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.

16. The optical lens according to any one of claims 1 to 8, characterized in that, 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.

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

Images