Optical lens

Abstract

The application provides an optical lens which is composed of two lenses with optical power and two catadioptric elements, and sequentially comprises, from an object side to an imaging surface along a light transmission direction, a first lens with positive optical power, a convex surface of which is located at the object side; a second lens with negative optical power, a concave surface of which is located at the image side; a first catadioptric element which comprises a first light incident surface, a first reflection surface, a second reflection surface, a third reflection surface, a fourth reflection surface and a first light exit surface, and all are planes; a second catadioptric element which comprises a second light incident surface, a fifth reflection surface, a sixth reflection surface, a seventh reflection surface, an eighth reflection surface and a second light exit surface, and all are planes; the first catadioptric element and the second catadioptric element both have multiple optical axes and multiple light path turns. The optical lens provided by the application can realize excellent effects of periscopic long-focus shooting, and has one or more advantages such as super-long focus, short total length, miniaturization, low sensitivity, high imaging quality and the like.

Description

Technical Field

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

[0002] With the rapid development of technology, people have increasingly higher requirements for cameras to meet different shooting scenarios, especially photography enthusiasts, who have a particularly strong demand for telephoto lenses. Most telephoto lenses on the market are either too long and bulky, or have insufficient focal length, resulting in poor telephoto performance. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an optical lens that is miniaturized, has a long focal length, and possesses excellent image quality.

[0004] The technical solution adopted in this invention is as follows:

[0005] An optical lens comprises two lenses with optical power and two catadioptric elements, and includes, in sequence from the object side to the imaging plane along the light transmission direction:

[0006] A first lens with positive optical power has a convex object-side surface.

[0007] A second lens with negative optical power has a concave image-side surface;

[0008] The first reflective element includes a first light incident surface, a first reflecting surface, a second reflecting surface, a third reflecting surface, a fourth reflecting surface, and a first light exiting surface, all of which are planar. Specifically, the first light incident surface and the second reflecting surface are substantially the same plane; the third reflecting surface and the first light exiting surface are substantially the same plane.

[0009] The second reflective element includes a second light incident surface, a fifth reflecting surface, a sixth reflecting surface, a seventh reflecting surface, an eighth reflecting surface, and a second light exiting surface, all of which are planar. Specifically, the second light incident surface and the sixth reflecting surface are substantially the same plane; the seventh reflecting surface and the second light exiting surface are substantially the same plane; and the cross-sections of both the first reflective element and the second reflective element are parallelograms.

[0010] The first refracting element has a first optical axis, a second optical axis, a third optical axis, a fourth optical axis, and a fifth optical axis. The light path enters the first refracting element along the first optical axis, passes through the first lens and the second lens, passes through the first light incident surface to the first reflective surface, is reflected to the second reflective surface, is then totally reflected to the third reflective surface, is then totally reflected to the fourth reflective surface, and is then reflected to the first light exiting surface before exiting and entering the second refracting element. The first reflective surface deflects the light path from the first optical axis to the second optical axis, the second reflective surface deflects the light path from the second optical axis to the third optical axis, the third reflective surface deflects the third optical axis to the fourth optical axis, and the fourth reflective surface deflects the fourth optical axis to the fifth optical axis.

[0011] The second reflective element has a sixth optical axis, a seventh optical axis, an eighth optical axis, a ninth optical axis, and a tenth optical axis; the optical path passes along the sixth optical axis through the second ray incident surface to the fifth reflecting surface, is reflected back to the sixth reflecting surface, is then totally reflected back to the seventh reflecting surface, is then totally reflected back to the eighth reflecting surface, and is then reflected back to the second ray exiting surface and exits to the imaging surface; the fifth reflecting surface deflects the optical path from the sixth optical axis to the seventh optical axis, the sixth reflecting surface deflects the optical path from the seventh optical axis to the eighth optical axis, the seventh reflecting surface deflects the eighth optical axis to the ninth optical axis, and the eighth reflecting surface deflects the ninth optical axis to the tenth optical axis; the tenth optical axis is perpendicular to the imaging surface; the first optical axis and the tenth optical axis are in the same direction; the fifth optical axis and the sixth optical axis are in the same direction;

[0012] Wherein, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 9 < (43.27 / IH×f) / 24 < 19.

[0013] Compared to existing technologies, the optical lens provided by this invention, through the arrangement of two lenses and two catadioptric elements, can achieve excellent super telephoto shooting effects. Because the light path undergoes multiple turns within the catadioptric elements, the volume of the folding optical system is greatly compressed. While achieving good telephoto shooting effects, the size of the optical lens is greatly reduced, thus achieving better lens miniaturization. This gives the optical lens one or more advantages such as super telephoto, short overall length, miniaturization, low sensitivity, and high image quality, greatly improving the user experience. Attached Figure Description

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

[0015] Figure 1This is a schematic diagram of the structure of the optical lens provided in Embodiment 1 of the present invention.

[0016] Figure 2 This is a schematic diagram of the prism structure and an optical path.

[0017] Figure 3 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 1 of the present invention.

[0018] Figure 4 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0019] Figure 5 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0020] Figure 6 This is a schematic diagram of the structure of the optical lens provided in Embodiment 2 of the present invention.

[0021] Figure 7 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 2 of the present invention.

[0022] Figure 8 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0023] Figure 9 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0024] Figure 10 This is a schematic diagram of the structure of the optical lens provided in Embodiment 3 of the present invention.

[0025] Figure 11 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 3 of the present invention.

[0026] Figure 12 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0027] Figure 13 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0028] Figure 14 This is a schematic diagram of the structure of the optical lens provided in Embodiment 4 of the present invention.

[0029] Figure 15 This is the F-Tan (Theta) distortion curve of the optical lens in Embodiment 4 of the present invention.

[0030] Figure 16 This is a field curvature curve diagram of the optical lens in Embodiment 4 of the present invention.

[0031] Figure 17 This is a chromatic aberration curve of the optical lens in Embodiment 4 of the present invention.

[0032] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0033] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0034] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0035] In the accompanying 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 illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0036] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0037] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0038] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] The optical lens provided in this embodiment of the invention consists of two lenses with optical power and two catadioptric elements, and sequentially includes a first lens, a second lens, a first catadioptric element and a second catadioptric element along the light transmission direction from the object side to the imaging surface.

[0041] The first lens may have positive optical power, its object side may be convex, and its image side may be concave or convex; the second lens may have negative optical power, its object side may be concave or convex, and its image side may be concave.

[0042] The first reflective element includes a first light incident surface, a first reflecting surface, a second reflecting surface, a third reflecting surface, a fourth reflecting surface, and a first light exiting surface, all of which are planar. Specifically, the first light incident surface and the second reflecting surface are essentially the same plane; the third reflecting surface and the first light exiting surface are essentially the same plane.

[0043] The second reflecting element includes a second incident surface, a fifth reflecting surface, a sixth reflecting surface, a seventh reflecting surface, an eighth reflecting surface, and a second exiting surface, all of which are planar. Specifically, the second incident surface and the sixth reflecting surface are essentially the same plane; the seventh reflecting surface and the second exiting surface are also essentially the same plane. The first and second reflecting elements can be prisms with a parallelogram-shaped cross-section.

[0044] The first refracting element has a first optical axis, a second optical axis, a third optical axis, a fourth optical axis, and a fifth optical axis. The light path enters the first refracting element along the first optical axis through the first lens and the second lens, passes through the first incident surface to the first reflecting surface, is reflected to the second reflecting surface, is then totally reflected to the third reflecting surface, is then totally reflected to the fourth reflecting surface, and is then reflected to the first exiting surface before exiting into the second refracting element. The first reflecting surface deflects the light path from the first optical axis to the second optical axis, the second reflecting surface deflects the light path from the second optical axis to the third optical axis, the third reflecting surface deflects the third optical axis to the fourth optical axis, and the fourth reflecting surface deflects the fourth optical axis to the fifth optical axis.

[0045] The second refracting element has a sixth, seventh, eighth, ninth, and tenth optical axis. The light path passes along the sixth optical axis through the second incident surface to the fifth reflecting surface, is reflected back to the sixth reflecting surface, is then totally reflected back to the seventh reflecting surface, is then totally reflected back to the eighth reflecting surface, and is then reflected back to the second exiting surface and exiting to the imaging surface. The fifth reflecting surface deflects the light path from the sixth optical axis to the seventh optical axis, the sixth reflecting surface deflects the light path from the seventh optical axis to the eighth optical axis, the seventh reflecting surface deflects the eighth optical axis to the ninth optical axis, and the eighth reflecting surface deflects the ninth optical axis to the tenth optical axis. The tenth optical axis is perpendicular to the imaging surface. The first and tenth optical axes are in the same direction. The fifth and sixth optical axes are in the same direction.

[0046] The optical path undergoes four bends within the first and second calibrating elements, respectively. The first and tenth optical axes are coaxial and aligned in the same direction. The first two lenses and the chip are coaxial, which helps improve manufacturing yield. The fifth and sixth optical axes are also coaxial and aligned in the same direction. The first, fourth, fifth, and eighth reflecting surfaces have reflective coatings or are mirrors. By using calibrating elements, the optical path can undergo multiple bends within the elements, significantly increasing the optical path length. This allows for more flexible spatial configuration, facilitating the reduction of the size of the folded optical system and achieving ultra-long focal length imaging.

[0047] In some embodiments, the optical lens may also include an aperture stop, which may be located between the object side and the first lens. It is understood that the aperture stop is used to limit the amount of light entering the lens, thereby altering the brightness of the image.

[0048] In some implementations, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy the following condition: 9 < (43.27 / IH×f) / 24 < 19. This condition is the formula for calculating optical magnification. Satisfying this condition indicates that the optical lens can achieve a high magnification super telephoto shooting effect of 9X~19X, not only possessing an ultra-long focal length but also well meeting the needs of periscope telephoto shooting. More specifically, 9.71 < (43.27 / IH×f) / 24 < 17.21.

[0049] In some embodiments, the long side D1 of the first reflecting element, the height H1 of the first reflecting element, and the angle θ1 between the first light incident surface and the first reflecting surface satisfy: -1.6 < D1 - 2 × H1 / tan(θ1) < 2.2; the long side D2 of the second reflecting element, the height H2 of the second reflecting element, and the angle θ2 between the second light incident surface and the fifth reflecting surface satisfy: -1.6 < D2 - 2 × H2 / tan(θ2) < 2.2. θ1 and θ2 can be understood as the angles between the long and short sides of the first and second reflecting elements, respectively. By satisfying the above conditions and reasonably setting the shapes of the first and second reflecting elements, the size of the first and second reflecting elements can be effectively limited, resulting in smaller heights and larger long sides for both elements. This reduces the volume of the optical lens while increasing the path length of the light within the reflecting elements. More specifically, -1.55 < D1-2×H1 / tan(θ1) < 2.02; -1.55 < D2-2×H2 / tan(θ2) < 2.02.

[0050] In some embodiments, the incident angle CRA at the maximum image height of the optical lens satisfies: 3° < CRA < 7°; the long side D1 of the first catadioptric element, the height H1 of the first catadioptric element, and the angle θ1 between the first light incident surface and the first reflecting surface satisfy: 10mm < D1 < 16mm; 2.8mm < H1 < 3.8mm; 23° < θ1 < 33°; the long side D2 of the second catadioptric element, the height H2 of the second catadioptric element, and the angle θ2 between the second light incident surface and the fifth reflecting surface satisfy: 10mm < D2 < 16mm; 2.8mm < H2 < 3.8mm; 23° < θ2 < 33°. Meeting these conditions reasonably limits the size of the first and second catadioptric elements, which is beneficial for miniaturizing the optical lens. More specifically, 3.6° < CRA < 6.46°; 10.8mm < D1 < 15.1mm; 2.89mm < H1 < 3.76mm; 24° < θ1 < 31°; 10.8mm < D2 < 15.1mm; 2.89mm < H2 < 3.76mm; 24° < θ2 < 31°.

[0051] In some embodiments, the angle θ1 between the first light incident surface and the first reflecting surface is equal to the angle θ2 between the second light incident surface and the fifth reflecting surface; the height H1 of the first reflecting element is equal to the height H2 of the second reflecting element.

[0052] In some embodiments, the distance L from the object-side surface of the first lens to the imaging surface in the first optical axis direction satisfies the following condition with respect to the effective focal length f of the optical lens: 0.27 < L / f < 0.37; the distance L from the object-side surface of the first lens to the imaging surface in the first optical axis direction satisfies the following condition with respect to the true image height IH corresponding to the maximum field of view of the optical lens: 1.6 < L / IH < 3.2. Meeting these conditions effectively reduces the thickness of the first lens, the second lens, and the catadioptric element while satisfying the requirements for a telephoto lens and a large image plane, thus meeting the demand for thinner and lighter products. More specifically, 0.29 < L / f < 0.35; 1.79 < L / IH < 2.97.

[0053] In some implementations, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy the condition: 0.08 < IH / f < 0.2. Meeting this condition helps to achieve a large image plane and improve the image quality of the lens. More specifically, 0.09 < IH / f < 0.2.

[0054] In some embodiments, the distance L from the object-side surface of the first lens to the imaging surface along the first optical axis satisfies the condition 0.22 < L / TTL < 0.3 for the total optical length (TTL) of the optical lens. It can be understood that TTL is the sum of the geometric distances from the object-side surface of the first lens to the imaging surface along all optical axes. Satisfying this condition effectively reduces the thickness of the first lens, the second lens, and the catadioptric element, meeting the demand for thinner and lighter products. More specifically, 0.24 < L / TTL < 0.29.

[0055] In some embodiments, the distance L from the object-side surface of the first lens to the imaging surface in the direction of the first optical axis, the true image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following: 115 < 180° × L / (IH / 2) / (FOV / 2) < 390°. Satisfying the above range is beneficial for balancing the relationship between the length of the optical lens, the image height, and the field of view. More specifically, 124.67 < 180° × L / (IH / 2) / (FOV / 2) < 355.4°.

[0056] In some embodiments, the half-aperture d1 of the object-side surface of the first lens, the true image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: 15 < d1 / (IH / 2) / tan(FOV / 2) < 43. Satisfying this range allows for a small front diameter while maintaining a large field of view and a large image plane, which is beneficial for the miniaturization of the optical lens. More specifically, 15.79 < d1 / (IH / 2) / tan(FOV / 2) < 41.16.

[0057] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy the following condition: 0.08 < f1 / f < 0.45; the radius of curvature R1 of the object-side surface of the first lens and the effective focal length f of the optical lens satisfy the following condition: 0.14 < R1 / f < 0.28. Meeting these conditions, as the first positive lens with a convex object-side surface, it can converge incident light rays, construct a long focal length optical path, and simultaneously provide a basis for optical path compression of the subsequent negative lens.

[0058] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy the following condition: -0.65 < f2 / f < -0.05; the radius of curvature R4 of the image-side surface of the second lens and the effective focal length f of the optical lens satisfy the following condition: 0.03 < R4 / f < 0.1. Meeting these ranges, the second lens is a negative lens, capable of diverging light rays, extending the equivalent focal length while shortening the physical optical path length, and simultaneously compensating for the aberrations of the preceding positive lens. More specifically, -0.6 < f2 / f < -0.06; 0.04 < R4 / f < 0.09.

[0059] In some embodiments, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the distance L from the object side of the first lens to the imaging plane in the first optical axis direction satisfy: 0.14 < (CT1 + CT2) / L < 0.2; the center thickness CT1 of the first lens, the distance CT12 between the first and second lenses in the first optical axis direction, the center thickness CT2 of the second lens, and the total optical length TTL of the optical lens satisfy: 0.03 < (CT1 + CT12 + CT2) / TTL < 0.07. By satisfying these conditions, the size ratio of the first and second lenses can be reasonably set to meet the product requirements for miniaturization of the optical lens. More specifically, 0.15 < (CT1 + CT2) / L < 0.19; 0.03 < (CT1 + CT12 + CT2) / TTL < 0.07.

[0060] In some implementations, the maximum field of view (FOV) of the optical lens and the aperture value (Fno) of the optical lens satisfy the following condition: 0.6° < FOV / Fno < 1.5°. Meeting this range balances the relationship between the maximum field of view and the aperture value, and makes the lens more compact, suitable for periscope structures (such as telephoto lenses for mobile phones), maintaining a small volume even after the optical path is folded. More specifically, 0.66° < FOV / Fno < 1.42°.

[0061] In some implementations, the true image height (IH) corresponding to the maximum field of view of the optical lens and the entrance pupil diameter (EPD) of the optical lens satisfy the following condition: 0.9 < IH / EPD < 1.5. Meeting this range ensures a balance between the field of view and luminous flux, improving the lens's image quality. More specifically, 0.93 < IH / EPD < 1.4.

[0062] In some implementations, the effective focal length f of the optical lens, the maximum field of view (FOV) of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.99 < (IH / 2) / (f × tan(FOV / 2)) < 1.02. Meeting this range results in a lens with low distortion, providing high-definition imaging.

[0063] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -1.5 < f1 / f2 < -0.7. Meeting this range forms a positive-negative optical power combination, which can improve the lens's temperature drift stability, reduce sensitivity, help reduce the impact of ambient temperature on the lens group, and also meet the lens's compactness requirements. More specifically, -1.35 < f1 / f2 < -0.73.

[0064] In some implementations, the true image height IH corresponding to the maximum field of view of the optical lens satisfies the following condition with respect to the effective focal length f of the optical lens: 200 < 43.27 / IH × f < 450. This condition is the formula for calculating the equivalent focal length; satisfying this condition indicates that the optical lens has a relatively long equivalent focal length. More specifically, 233.29 < 43.27 / IH × f < 412.79.

[0065] In some embodiments, the half-aperture d1 of the object-side surface of the first lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.7 < d1 / (IH / 2) < 1.1. Satisfying this condition balances the relationship between the front aperture and image height of the optical lens. More specifically, 0.72 < d1 / (IH / 2) < 1.09.

[0066] In some embodiments, the optical lens satisfies the following conditions: 27mm < f < 44mm, 3.5mm < EPD < 4.7mm, 8.5mm < L < 13mm, 30mm < TTL < 52mm, 7 < Fno < 9.5, 4mm < IH < 6.5mm, 5° < FOV < 11°; where f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, L represents the distance from the object side of the first lens to the imaging plane along the first optical axis, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, IH represents the true image height corresponding to the maximum field of view of the optical lens, and FOV represents the maximum field of view of the optical lens. By satisfying the above conditions, the optical lens provided in the embodiments of the present invention has at least the characteristics of ultra-long focal length, short total length, and miniaturization. More specifically, 29.76mm < f < 40.27mm, 3.69mm < EPD < 4.51mm, 8.98mm < L < 12.51mm, 31.88mm < TTL < 50.01mm, 7.5 < Fno < 8.96, 4.21mm < IH < 6.11mm, and 5.99° < FOV < 10.61°.

[0067] In some embodiments, the lens and reflecting element in the optical lens provided by the present invention can be made of glass or plastic. When the lens and reflecting element are made of plastic, production costs can be effectively reduced. Conversely, when the lens and reflecting element are made of glass, the low dispersion characteristic of glass itself can effectively correct the geometric chromatic aberration of the optical system. In the optical lens provided by the present invention, the first and second reflecting elements can be made of glass; the first and second lenses can be made of plastic, which not only gives the lens excellent imaging performance but also allows for a more compact lens structure, achieving a better balance between lens miniaturization and high image quality.

[0068] In some embodiments, the first lens and the second lens can be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberrations of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, both the first lens and the second lens of the present invention can be aspherical lenses, which can effectively reduce the aberrations of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization.

[0069] In various embodiments of the present invention, when an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations:

[0070] ;

[0071] Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, and F are the fourth, sixth, eighth, tenth, and twelfth order surface coefficients, respectively.

[0072] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0073] Example 1

[0074] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the prism structure and the optical path. The optical lens, along the light transmission direction from the object side to the imaging plane, includes: an aperture stop ST, a first lens L1, a second lens L2, a first catadioptric element Pr1, and a second catadioptric element Pr2.

[0075] The first lens L1 has positive optical power, its object side S1 is convex, and its image side S2 is concave.

[0076] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0077] The first reflective element Pr1 includes a first light incident surface S5, a first reflecting surface S6, a second reflecting surface S7, a third reflecting surface S8, a fourth reflecting surface S9, and a first light exit surface S10, all of which are planar. Specifically, the first light incident surface S5 and the second reflecting surface S7 are essentially the same plane; the third reflecting surface S8 and the first light exit surface S10 are essentially the same plane.

[0078] The second reflective element Pr2 includes a second light incident surface S11, a fifth reflecting surface S12, a sixth reflecting surface S13, a seventh reflecting surface S14, an eighth reflecting surface S15, and a second light exit surface S16, all of which are planar. Specifically, the second light incident surface S11 and the sixth reflecting surface S13 are essentially the same plane; the seventh reflecting surface S14 and the second light exit surface S16 are essentially the same plane.

[0079] The cross-sections of the first reflective element Pr1 and the second reflective element Pr2 are both parallelograms; the angle θ1 between the first incident surface S5 and the first reflecting surface S6 is 30°; the angle θ2 between the second incident surface S11 and the fifth reflecting surface S12 is 30°. The height H1 of the first reflective element Pr1 is 3.75 mm; the height H2 of the second reflective element Pr2 is 3.75 mm. The long side D1 of the first reflective element Pr1 is 15 mm; the long side D2 of the second reflective element Pr2 is 13.8 mm.

[0080] The first refracting element Pr1 has a first optical axis OA1, a second optical axis OA2, a third optical axis OA3, a fourth optical axis OA4, and a fifth optical axis OA5. The light path follows the first optical axis OA1, passes through the first lens L1 and the second lens L2, enters the first refracting element Pr1, passes through the first incident surface S5 to the first reflecting surface S6, is reflected to the second reflecting surface S7, is then totally reflected to the third reflecting surface S8, is then totally reflected to the fourth reflecting surface S9, and is finally reflected to the first exiting surface S10 before exiting and entering the second refracting element Pr2. The first reflecting surface S6 deflects the light path from the first optical axis OA1 to the second optical axis OA2; the second reflecting surface S7 deflects the light path from the second optical axis OA2 to the third optical axis OA3; the third reflecting surface S8 deflects the third optical axis OA3 to the fourth optical axis OA4; and the fourth reflecting surface S9 deflects the fourth optical axis OA4 to the fifth optical axis OA5.

[0081] The second reflective element Pr2 has a sixth optical axis OA6, a seventh optical axis OA7, an eighth optical axis OA8, a ninth optical axis OA9, and a tenth optical axis OA10. The light path travels along the sixth optical axis OA6, passes through the second incident surface S11 to the fifth reflecting surface S12, is reflected to the sixth reflecting surface S13, undergoes total reflection to the seventh reflecting surface S14, then to the eighth reflecting surface S15, and finally reflects to the second exiting surface S16 before exiting onto the imaging surface. The fifth reflecting surface S12 deflects the light path from the sixth optical axis OA6 to the seventh optical axis OA7; the sixth reflecting surface S13 deflects the light path from the seventh optical axis OA7 to the eighth optical axis OA8; the seventh reflecting surface S14 deflects the eighth optical axis OA8 to the ninth optical axis OA9; and the eighth reflecting surface S15 deflects the ninth optical axis OA9 to the tenth optical axis OA10 (the tenth optical axis OA10 is perpendicular to the imaging surface).

[0082] The optical path undergoes four optical path bends within the first and second refracting elements Pr1 and Pr2, respectively. The first optical axis OA1 and the tenth optical axis OA10 are in the same direction; the fifth optical axis OA5 and the sixth optical axis OA6 are in the same direction. The first reflecting surface S6, the fourth reflecting surface S9, the fifth reflecting surface S12, and the eighth reflecting surface S15 have reflective coatings (coatings) or are mirror surfaces.

[0083] The first lens L1 and the second lens L2 are made of plastic aspherical lenses. The first catadioptric element Pr1 and the second catadioptric element Pr2 can be made of glass.

[0084] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0085] Table 1-1

[0086]

[0087] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0088] Table 1-2

[0089]

[0090] In this embodiment, the F-Tan (Theta) distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 3 , Figure 4 , Figure 5 As shown.

[0091] Figure 3 The distortion curve of Example 1 is shown, which represents the distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the distortion of the optical lens is controlled within -0.02% to 0, indicating that the optical lens 100 can effectively correct distortion.

[0092] Figure 4 The field curvature curve of Embodiment 1 is shown, which represents the field curvature of light rays in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within 0~0.05 mm, indicating that the optical lens 100 can effectively correct the field curvature.

[0093] Figure 5 The diagram shows the transverse chromatic aberration curves for Example 1, representing the transverse chromatic aberration of each wavelength relative to the center wavelength (0.555 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the diagram, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1 μm to 2 μm, indicating that the optical lens 100 can effectively correct chromatic aberration.

[0094] Example 2

[0095] Please see Figure 6The diagram shows a schematic of the optical lens 200 provided in Embodiment 2 of the present invention. This embodiment is largely the same as Embodiment 1, with similar light reversal and transmission paths. The main difference lies in the optical parameters such as the radius of curvature and lens thickness of each lens surface. Specifically, the angle θ1 between the first light incident surface S5 and the first reflecting surface S6 is 30°; the angle θ2 between the second light incident surface S11 and the fifth reflecting surface S12 is 30°. The height H1 of the first reflecting element Pr1 is 3.75 mm; the height H2 of the second reflecting element Pr2 is 3.75 mm. The long side D1 of the first reflecting element Pr1 is 15 mm; the long side D2 of the second reflecting element Pr2 is 15 mm.

[0096] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0097] Table 2-1

[0098]

[0099] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0100] Table 2-2

[0101]

[0102] In this embodiment, the F-Tan (Theta) distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Figure 9 As shown.

[0103] from Figure 7 As can be seen, the distortion of the optical lens is controlled within 0~0.02%, indicating that the optical lens 200 can effectively correct distortion.

[0104] from Figure 8 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.02mm, indicating that the optical lens 200 can effectively correct the field curvature.

[0105] from Figure 9 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0106] Example 3

[0107] Please see Figure 10The diagram shows a schematic of the optical lens 300 provided in Embodiment 3 of the present invention. This embodiment is largely the same as Embodiment 1, with similar light reversal and transmission paths. The main differences are: the image-side surface S2 of the first lens L1 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different. Specifically, the angle θ1 between the first light incident surface S5 and the first reflecting surface S6 is 30°; the angle θ2 between the second light incident surface S11 and the fifth reflecting surface S12 is 30°. The height H1 of the first reflecting element Pr1 is 3.75 mm; the height H2 of the second reflecting element Pr2 is 3.75 mm. The long side D1 of the first reflecting element Pr1 is 15 mm; the long side D2 of the second reflecting element Pr2 is 13.8 mm.

[0108] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0109] Table 3-1

[0110]

[0111] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0112] Table 3-2

[0113]

[0114] In this embodiment, the F-Tan (Theta) distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 11 , Figure 12 , Figure 13 As shown.

[0115] from Figure 11 As can be seen, the distortion of the optical lens is controlled within -0.05% to 0, indicating that the optical lens 300 can effectively correct distortion.

[0116] from Figure 12 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.02mm to 0.06mm, indicating that the optical lens 300 can effectively correct the field curvature.

[0117] from Figure 13 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0118] Example 4

[0119] Please see Figure 14The diagram shows a schematic of the optical lens 400 provided in Embodiment 4 of the present invention. This embodiment is largely the same as Embodiment 1, with similar light reversal and transmission paths. The main differences are: the image-side surface S2 of the first lens L1 is convex; the object-side surface S3 of the second lens L2 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different. Specifically, the angle θ1 between the first light incident surface S5 and the first reflecting surface S6 is 25°; the angle θ2 between the second light incident surface S11 and the fifth reflecting surface S12 is 25°. The height H1 of the first catadioptric element Pr1 is 2.9 mm; the height H2 of the second catadioptric element Pr2 is 2.9 mm. The long side D1 of the first catadioptric element Pr1 is 10.9 mm; the long side D2 of the second catadioptric element Pr2 is 10.9 mm.

[0120] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0121] Table 4-1

[0122]

[0123] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0124] Table 4-2

[0125]

[0126] In this embodiment, the F-Tan (Theta) distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 400 are respectively as follows: Figure 15 , Figure 16 , Figure 17 As shown.

[0127] from Figure 15 As can be seen, the distortion of the optical lens is controlled within 0~0.4%, indicating that the optical lens 400 can effectively correct distortion.

[0128] from Figure 16 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.3mm, indicating that the optical lens 400 can effectively correct the field curvature.

[0129] from Figure 17 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within ±5μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0130] Please refer to Table 5 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL (the sum of the geometric distances from the object side of the first lens to the imaging surface on all optical axes), the aperture value Fno, the true image height IH corresponding to the maximum field of view, the principal ray incident angle CRA at the maximum image height, the maximum field of view FOV, the distance L from the object side of the first lens to the imaging surface in the direction of the first optical axis, and the values ​​corresponding to each conditional expression in each embodiment.

[0131] Table 5

[0132]

[0133] In summary, the optical lens provided by this invention, through the arrangement of two lenses and two catadioptric elements, can achieve excellent super telephoto shooting effects, with an optical zoom of 9.7~17.2. Because the optical path undergoes multiple bends within the catadioptric elements, the volume of the folding optical system is greatly compressed. While achieving excellent telephoto shooting effects, the size of the optical lens is significantly reduced (allowing it to be placed upright in a mobile phone), effectively achieving lens miniaturization. This results in the optical lens possessing one or more advantages such as super telephoto, short overall length, miniaturization, low sensitivity, and high image quality, greatly improving the user experience.

[0134] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0135] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens characterized in that, Composed of two pieces of lenses with optical power and two pieces of catadioptric elements, sequentially comprising from the object side to the imaging surface in the direction of light transmission: a first lens with positive optical power, the object side surface of which is convex; a second lens with negative optical power, the image side surface of which is concave; the first catadioptric element comprises a first light incident surface, a first reflection surface, a second reflection surface, a third reflection surface, a fourth reflection surface and a first light exit surface, all of which are planes, wherein the first light incident surface and the second reflection surface are the same plane; the third reflection surface and the first light exit surface are the same plane; the second catadioptric element comprises a second light incident surface, a fifth reflection surface, a sixth reflection surface, a seventh reflection surface, an eighth reflection surface and a second light exit surface, all of which are planes, wherein the second light incident surface and the sixth reflection surface are the same plane; the seventh reflection surface and the second light exit surface are the same plane; the cross sections of the first catadioptric element and the second catadioptric element are parallelograms; the first catadioptric element has a first optical axis, a second optical axis, a third optical axis, a fourth optical axis and a fifth optical axis; the light path passes through the first lens, the second lens into the first catadioptric element along the first optical axis, passes through the first light incident surface to the first reflection surface, reflects to the second reflection surface, totally reflects to the third reflection surface, totally reflects to the fourth reflection surface, reflects to the first light exit surface and exits, and enters the second catadioptric element; the first reflection surface turns the light path from the first optical axis to the second optical axis, the second reflection surface turns the light path from the second optical axis to the third optical axis, the third reflection surface turns the third optical axis to the fourth optical axis, and the fourth reflection surface turns the fourth optical axis to the fifth optical axis; the second catadioptric element has a sixth optical axis, a seventh optical axis, an eighth optical axis, a ninth optical axis and a tenth optical axis; the light path passes through the second light incident surface to the fifth reflection surface along the sixth optical axis, reflects to the sixth reflection surface, totally reflects to the seventh reflection surface, totally reflects to the eighth reflection surface, reflects to the second light exit surface and exits to the imaging surface; the fifth reflection surface turns the light path from the sixth optical axis to the seventh optical axis, the sixth reflection surface turns the light path from the seventh optical axis to the eighth optical axis, the seventh reflection surface turns the eighth optical axis to the ninth optical axis, and the eighth reflection surface turns the ninth optical axis to the tenth optical axis; the tenth optical axis is perpendicular to the imaging surface; the first optical axis and the tenth optical axis are in the same direction; the fifth optical axis and the sixth optical axis are in the same direction; wherein the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 9 < (43.27 / IH x f) / 24 < 19.

2. The optical lens of claim 1, wherein, The long side D1 of the first catadioptric element, the height H1 of the first catadioptric element, and the angle θ1 between the first light-incident surface and the first reflecting surface satisfy: -1.6 < D1-2×H1 / tan(θ1) < 2.2; the long side D2 of the second catadioptric element, the height H2 of the second catadioptric element, and the angle θ2 between the second light-incident surface and the fifth reflecting surface satisfy: -1.6 < D2-2×H2 / tan(θ2) < 2.

2.

3. The optical lens of claim 2, wherein, The angle of incidence CRA at the maximum image height of the optical lens satisfies: 3° < CRA < 7°; the long side D1 of the first catadioptric element, the height H1 of the first catadioptric element, and the angle θ1 between the first light-incident surface and the first reflecting surface satisfy: 10 mm < D1 < 16 mm; 2.8 mm < H1 < 3.8 mm; 23° < θ1 < 33°, respectively; the long side D2 of the second catadioptric element, the height H2 of the second catadioptric element, and the angle θ2 between the second light-incident surface and the fifth reflecting surface satisfy: 10 mm < D2 < 16 mm; 2.8 mm < H2 < 3.8 mm; 23° < θ2 < 33°, respectively.

4. The optical lens of claim 3, wherein, The angle θ1 between the first light-incident surface and the first reflecting surface is equal to the angle θ2 between the second light-incident surface and the fifth reflecting surface; the height H1 of the first catadioptric element is equal to the height H2 of the second catadioptric element.

5. The optical lens of claim 1, wherein, The distance L from the object side surface of the first lens to the imaging surface in the first optical axis direction and the effective focal length f of the optical lens satisfy: 0.27 < L / f < 0.37; the distance L from the object side surface of the first lens to the imaging surface in the first optical axis direction and the real image height IH corresponding to the maximum field angle of view of the optical lens satisfy: 1.6 < L / IH < 3.

2.

6. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field angle of view of the optical lens and the effective focal length f of the optical lens satisfy: 0.08 < IH / f < 0.2; the distance L from the object side surface of the first lens to the imaging surface in the first optical axis direction and the total optical length TTL of the optical lens satisfy: 0.22 < L / TTL < 0.

3.

7. The optical lens of claim 1, wherein, The distance L from the object side surface of the first lens to the imaging surface in the first optical axis direction, the real image height IH corresponding to the maximum field angle of view of the optical lens, and the maximum field angle of view FOV of the optical lens satisfy: 115 < 180°×L / (IH / 2) / (FOV / 2) < 390; the half entrance pupil radius d1 of the object side surface of the first lens, the real image height IH corresponding to the maximum field angle of view of the optical lens, and the maximum field angle of view FOV of the optical lens satisfy: 15 < d1 / (IH / 2) / tan(FOV / 2) < 43.

8. The optical lens of claim 1, wherein, The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 0.08 < f1 / f < 0.45; the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.14 < R1 / f < 0.

28.

9. The optical lens of claim 1, wherein, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -0.65 < f2 / f < -0.05; the image-side surface curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: 0.03 < R4 / f < 0.

1.

10. The optical lens of claim 1, wherein, The center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the distance L of the object-side surface of the first lens to the imaging surface in the first optical axis direction satisfy: 0.14 < (CT1+CT2) / L < 0.2; the center thickness CT1 of the first lens, the interval CT12 of the first lens and the second lens in the first optical axis direction, the center thickness CT2 of the second lens, and the total track length TTL of the optical lens satisfy: 0.03 < (CT1+CT12+CT2) / TTL < 0.07.

Images