Optical lens, camera module, and electronic device

Abstract

The present application relates to the technical field of optical lenses, and provides an optical lens, a camera module, and an electronic device, which can solve the problem in the related art of relatively high cost of the camera module caused by relatively high design difficulty of a driving motor of a focusing lens group. The optical lens comprises a front lens group, a first lens group, and a second lens group which are arranged in a direction from an object side to an image side. The optical lens has a lens optical axis, the first lens group and the second lens group are arranged along the lens optical axis, and the first lens group and the second lens group can respectively move along the lens optical axis by different distances relative to the front lens group, so that the optical lens is switched between a short-focal-length state and a long-focal-length state. The first lens group can move along the lens optical axis, so that the optical lens can be switched between close-object focusing and distant-object focusing. A first focal power distribution ratio β=fg01 / fg0, and a second focal power distribution ratio α=F / fg01, wherein fg0 is the effective focal length of the front lens group, fg01 is a combined focal length of the front lens group and the first lens group, and F is the effective focal length of the optical lens; β satisfies: 0.23≤|β|<1; and / or α satisfies: |α|≤2. The present application can be applied to an electronic device such as a mobile phone.

Description

Optical lens, camera module and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202410440463.3, filed on April 9, 2024, and entitled “Zoom lens, camera module and electronic device”, the content of which is incorporated herein by reference in its entirety.

[0002] The present application claims priority to the Chinese patent application No. 202411140665.2, filed on August 19, 2024, and entitled “Optical lens, camera module and electronic device”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of optical lenses, in particular to an optical lens, a camera module and an electronic device. BACKGROUND

[0004] At present, optical lenses have become one of the important components in electronic devices, and through optical lenses, the desired photos can be easily obtained to meet the needs of people taking photos. Initially, the optical lenses of electronic devices are fixed focus, that is, the focal length of the optical lens remains unchanged, and such optical lenses are called fixed focus lenses. With the increasing requirement of people on the imaging quality of electronic devices, fixed focus lenses cannot meet the requirements of shooting, and therefore, optical lenses with variable focal length (i.e., zoom lenses) have emerged.

[0005] A zoom lens is an optical lens that can change the focal length without changing the shooting position, allowing users to enlarge or reduce the photographed object by adjusting the focal length. The working principle of the zoom lens is based on the physical properties of optical lenses. By changing the position of the lenses inside the optical lens, the focal length of the optical lens can be adjusted, thereby achieving the effect of enlarging or reducing the photographed object. Zoom lenses have been widely used in electronic devices such as mobile phones, tablets, wearable devices, etc., and how to design zoom lenses has become one of the important topics in the industry. SUMMARY

[0006] Embodiments of the present application provide an optical lens, a camera module and an electronic device, which are used to solve the problem that the design difficulty of the driving motor of the focusing lens group in the related art is high, resulting in high cost of the camera module.

[0007] To achieve the above-mentioned purpose, embodiments of the present application adopt the following technical solutions:

[0008] In a first aspect, embodiments of the present application provide an optical lens, comprising a front lens group G0, a first lens group G1 and a second lens group G2 arranged along a direction from an object side to an image side; the optical lens has a lens optical axis, the first lens group G1 and the second lens group G2 are arranged along the lens optical axis, the first lens group G1 and the second lens group G2 can respectively move different distances along the lens optical axis relative to the front lens group G0, so as to switch the optical lens between a short-focus state and a long-focus state; when the optical lens is in the short-focus state or the long-focus state, the front lens group G0 and the second lens group G2 are relatively fixed in the direction along the lens optical axis, and the first lens group G1 can move along the lens optical axis, so as to switch the optical lens between a focus near scene and a focus far scene; a first power distribution ratio β = f g01 / f g0 , a second power distribution ratio α = F / f g01 , f g0 is an effective focal length of the front lens group G0, f g01 is a combined focal length of the front lens group G0 and the first lens group G1, and F is an effective focal length of the optical lens; β satisfies: 0.23 ≤ |β| < 1; and / or, α satisfies: |α| ≤ 2. In this way, it can be avoided that the focus stroke of the first lens group G1 is too small when the optical lens is switched between the focus near scene and the focus far scene, which is beneficial to reduce the precision requirement of the driving motor of the first lens group G1, thereby being beneficial to reduce the cost of the camera module of the electronic device.

[0009] In some embodiments of the first aspect, β satisfies: 0.23 ≤ |β| ≤ 0.45. In this way, it can be avoided that the focus stroke of the first lens group G1 is too large when the optical lens is switched between the focus near scene and the focus far scene, so that the volume of the driving motor of the first lens group G1 can be reduced, thereby being beneficial to the miniaturization of the camera module.

[0010] In some embodiments of the first aspect, in the case that the optical lens is focused on the far scene, when the optical lens is in the short-focus state and the effective focal length of the optical lens is the minimum value in the short-focus state, β satisfies: 0.23 ≤ |β| ≤ 0.39. In this way, it can not only reduce the focus stroke of the first lens group G1 and be beneficial to reduce the volume of the driving motor of the first lens group G1, but also avoid that the focus stroke of the first lens group G1 is too short and reduce the precision requirement of the driving motor of the first lens group G1.

[0011] In some embodiments of the first aspect, in the case that the optical lens focuses on a far scene, when the optical lens is in the long-focus state and the effective focal length of the optical lens is the maximum value in the short-focus state, β satisfies: 0.27≤|β|≤0.45. In this way, the focusing stroke of the first lens group G1 can be reduced, which is conducive to reducing the volume of the driving motor of the first lens group G1; and the focusing stroke of the first lens group G1 can be prevented from being too short, which reduces the precision requirement of the driving motor of the first lens group G1.

[0012] In some embodiments of the first aspect, α satisfies: 1.1≤|α|≤2. In this way, when the optical lens switches between focusing on a near scene and focusing on a far scene, the focusing stroke of the first lens group G1 can be prevented from being too large, which is conducive to preventing the volume of the driving motor of the first lens group G1 from being too large.

[0013] In some embodiments of the first aspect, in the case that the optical lens focuses on a far scene, when the optical lens is in the short-focus state and the effective focal length of the optical lens is the minimum value in the short-focus state, α satisfies: 1.1≤|α|≤1.67. In this way, the focusing stroke of the first lens group G1 can be reduced, which is conducive to reducing the volume of the driving motor of the first lens group G1; and the focusing stroke of the first lens group G1 can be prevented from being too short, which reduces the precision requirement of the driving motor of the first lens group G1.

[0014] In some embodiments of the first aspect, in the case that the optical lens focuses on a far scene, when the optical lens is in the long-focus state and the effective focal length of the optical lens is the maximum value in the short-focus state, α satisfies: 1.86≤|α|≤1.94. In this way, the focusing stroke of the first lens group G1 can be reduced, which is conducive to reducing the volume of the driving motor of the first lens group G1; and the focusing stroke of the first lens group G1 can be prevented from being too short, which reduces the precision requirement of the driving motor of the first lens group G1.

[0015] In some embodiments of the first aspect, the focusing stroke compression ratio ξ=(1-β 2 )α 2 satisfies: ξ≤3.5. In this way, when the optical lens switches between focusing on a near scene and focusing on a far scene, the focusing stroke of the first lens group G1 can be prevented from being too small, which is conducive to reducing the precision requirement of the driving motor of the first lens group G1.

[0016] In some embodiments of the first aspect, in the case that the optical lens focuses on a far scene, when the optical lens is in the short-focus state and the effective focal length of the optical lens is the minimum value of the short-focus state, ξ satisfies: 1.1≤ξ≤2.4. In this way, the focusing stroke of the first lens group G1 can be reduced, which is conducive to reducing the volume of the driving motor of the first lens group G1; and the focusing stroke of the first lens group G1 can be prevented from being too short, which reduces the precision requirement of the driving motor of the first lens group G1.

[0017] In some embodiments of the first aspect, in the case that the optical lens focuses on a far scene, when the optical lens is in the long-focus state and the effective focal length of the optical lens is the maximum value of the short-focus state, ξ satisfies: 3.0≤ξ≤3.5. In this way, the focusing stroke of the first lens group G1 can be reduced, which is conducive to reducing the volume of the driving motor of the first lens group G1; and the focusing stroke of the first lens group G1 can be prevented from being too short, which reduces the precision requirement of the driving motor of the first lens group G1.

[0018] In some embodiments of the first aspect, the third power distribution ratio γ=F / f g0 ; γ satisfies:

[0019] wherein, ξ=(1-β 2 )α 2 . In this way, when the current lens group G0 performs an anti-shake movement, the optical lens can have a smaller MTF loss; and the volume of the optical lens can be reduced.

[0020] In some embodiments of the first aspect, in the case that the optical lens focuses on a far scene, when the optical lens is in the short-focus state and the effective focal length of the optical lens is the minimum value of the short-focus state, γ satisfies: 0.27≤|γ|≤0.65. In this way, when the current lens group G0 performs an anti-shake movement, the optical lens can have a smaller MTF loss; and the volume of the optical lens in the short-focus state can be reduced.

[0021] In some embodiments of the first aspect, in the case that the optical lens focuses on a far scene, when the optical lens is in the long-focus state and the effective focal length of the optical lens is the maximum value of the short-focus state, γ satisfies: 0.55≤|γ|≤0.85. In this way, when the current lens group G0 performs an anti-shake movement, the optical lens can have a smaller MTF loss; and the volume of the optical lens in the long-focus state can be reduced.

[0022] In some embodiments of the first aspect, the closest focusing distance U 0min ′ of the optical lens satisfies: U 0min≥ 75mm. In this way, the optical lens can capture the details of the scene at a closer distance, thereby improving the imaging quality of the optical lens at a closer distance.

[0023] In some embodiments of the first aspect, the effective focal length f g0 of the first lens group G1 satisfies: g1 satisfies:

[0024] wherein the coefficient In this way, the optical lens can capture the details of the scene at a closer distance, thereby improving the imaging quality of the optical lens at a closer distance.

[0025] In some embodiments of the first aspect, during the switching of the optical lens between the short-focus state and the long-focus state, the movement distance q of the first lens group G1 satisfies: q ≤ 9.7mm. In this way, the movement distance q of the first lens group G1 during the switching of the optical lens between the short-focus state and the long-focus state can be avoided to be too large, thereby facilitating the reduction of the volume of the driving motor of the first lens group G1.

[0026] In some embodiments of the first aspect, the movement distance q of the first lens group G1 includes an optical zoom movement distance q1, which is the movement distance of the first lens group G1 during the switching of the optical lens between the short-focus state and the long-focus state when the optical lens is focusing on a distant scene; the optical zoom movement distance q1 satisfies: q1 = |m f g1 | ≤ 9.1mm; wherein the coefficient m is: the difference between the value of 1 / β when the optical lens is in the short-focus state and the value of 1 / β when the optical lens is in the long-focus state when the optical lens is focusing on a distant scene; f g1 is the effective focal length of the first lens group G1. In this way, by reasonably setting the sizes of f g1 and β, the optical zoom movement distance q1 of the first lens group G1 can be controlled, thereby the volume of the driving motor of the first lens group G1 can be controlled, and further the volume of the camera module can be controlled.

[0027] In some embodiments of the first aspect, during the switching of the optical lens between the short-focus state and the long-focus state, the movement distance Δ of the second lens group G2 satisfies: Δ ≤ 15.8mm. In this way, the movement distance Δ of the second lens group G2 during the switching of the optical lens between the short-focus state and the long-focus state can be avoided to be too large, thereby facilitating the reduction of the volume of the driving motor of the second lens group G2.

[0028] In some embodiments of the first aspect, the movement distance Δ of the second lens group G2 satisfies: Δ = |-n f g2|≤15.8mm; wherein, the coefficient n is the difference between the value of a when the optical lens is in the long-focus state and the value of a when the optical lens is in the short-focus state; f g2 is the effective focal length of the second lens group G2. In this way, by reasonably setting the value of f g2 , the size of a can control the moving distance of the second lens group G2, so as to control the volume of the driving motor of the second lens group G2, and further control the volume of the camera module.

[0029] In some embodiments of the first aspect, the maximum optical zoom ratio Г max satisfies: Г max ≤ 2.1; wherein, the maximum optical zoom ratio Г max of the optical lens is the maximum ratio of the effective focal length when the optical lens is in the long-focus state to the effective focal length when the optical lens is in the short-focus state in the case that the optical lens focuses on a far scene; j1 is the value of a when the optical lens is in the long-focus state and focuses on a far scene; j2 is the value of a when the optical lens is in the short-focus state and focuses on a far scene. In this way, the total length of the optical lens can be prevented from being too long, so as to be conducive to reducing the volume of the optical lens.

[0030] In some embodiments of the first aspect, the maximum system zoom ratio Г′ max satisfies: Г′ max ≤ 2.5. Wherein, the maximum system zoom ratio Г′ max of the optical lens is the ratio of the maximum effective focal length to the minimum effective focal length of the optical lens. In this way, the total length of the optical lens can be prevented from being too long, so as to be conducive to reducing the volume of the optical lens.

[0031] In some embodiments of the first aspect, the optical power of the first lens group G1 is positive, and the optical power of the second lens group G2 is negative. In this way, not only can the total length of the optical lens be reduced, which is conducive to realizing the miniaturization design of the optical lens, but also is conducive to correcting the aberrations such as spherical aberration and chromatic aberration of the optical lens, and further is conducive to improving the imaging quality of the optical lens.

[0032] In some embodiments of the first aspect, the front lens group G0 includes one positive lens L01 and at least one negative lens along an object side to image side direction; the first lens group G1 includes a first lens L11, a second lens L12 and a third lens L13 along an object side to image side direction, the first lens L11 and the third lens L13 have positive refractive powers, the second lens L12 has a positive refractive power or a negative refractive power, and there is a gap between any two adjacent lenses among the first lens L11, the second lens L12 and the third lens L13; the second lens group G2 includes a fourth lens L21 and a fifth lens L22 both having negative refractive powers along an object side to image side direction, and there is a gap between the fourth lens L21 and the fifth lens L22. In this way, the aberration of the optical lens can be further corrected.

[0033] In some embodiments of the first aspect, the front lens group G0 further includes a first turning element; the positive lens L01 is disposed on the object side of the first turning element, and the at least one negative lens is disposed on the image side of the first turning element. In this way, the positive lens L01 and the at least one negative lens make full use of the space on the object side and the image side of the first turning element, so that the front lens group G0 is designed more compactly.

[0034] In some embodiments of the first aspect, the positive lens L01 and the at least one negative lens are both disposed on the image side of the first turning element. In this way, the structure of the optical lens can be simplified to reduce the cost of the optical lens.

[0035] In some embodiments of the first aspect, the first turning element is a prism including a first prism entrance surface and a first prism exit surface, the first prism entrance surface is disposed towards the object side of the optical lens, and the first prism exit surface is disposed towards the side where the first lens group G1 is located.

[0036] In some embodiments of the first aspect, the first turning element is a reflector.

[0037] In some embodiments of the first aspect, the second lens L12 includes one positive lens L121 and one negative lens L122 disposed apart. In this way, the aberration of the optical lens can be corrected.

[0038] In some embodiments of the first aspect, the second lens L12 includes two negative lenses disposed apart. In this way, the aberration of the optical lens can be corrected.

[0039] In some embodiments of the first aspect, the fifth lens L22 includes one positive lens and one negative lens disposed apart. In this way, the aberration of the optical lens can be corrected.

[0040] In some embodiments of the first aspect, the optical lens further includes a second turning element for reflecting the exiting light beam of the second lens group G2 to the photosensitive element.

[0041] In some embodiments of the first aspect, the second turning element is a prism, comprising a second prism entrance surface and a second prism exit surface, the second prism entrance surface is arranged towards the side where the second lens group G2 is located, and the second prism exit surface is arranged towards the side where the image plane of the optical lens is located.

[0042] In some embodiments of the first aspect, the second turning element is a mirror.

[0043] In the second aspect, the embodiments of the present application provide a camera module, comprising a photosensitive element and the optical lens in the first aspect, and the photosensitive element is arranged on the image side of the optical lens.

[0044] The camera module in the embodiments of the present application has the same beneficial effects as the optical lens in the first aspect, which will not be repeated here.

[0045] In some embodiments of the second aspect, the effective photosensitive area S1 of the photosensitive element when the optical lens is in the long-focus state and the effective photosensitive area S2 of the photosensitive element when the optical lens is in the short-focus state satisfy S1≤S2. In this way, the imaging quality of the optical lens can be improved, and the depth of field can be better controlled.

[0046] In the third aspect, the embodiments of the present application provide an electronic device, comprising a housing and the camera module in the second aspect, and the camera module is mounted on the housing.

[0047] The electronic device in the embodiments of the present application has the same beneficial effects as the optical lens in the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0048] FIG. 1a is a schematic diagram of the definition of the main image plane and the main image point of the optical system;

[0049] FIG. 1b is a schematic diagram of the definition of the main object plane and the main object point of the optical system;

[0050] FIG. 2 is a schematic diagram of the definition of the object distance and the image distance of the optical system;

[0051] FIG. 3 is a schematic diagram of the back of the electronic device (mobile phone) in some embodiments of the present application;

[0052] FIG. 4 is an A-A sectional view of the electronic device in FIG. 3;

[0053] FIG. 5 is a schematic diagram of the structure of the optical lens in the first embodiment of the present application in the short-focus state;

[0054] FIG. 6 is a schematic diagram of the structure of the optical lens in the first embodiment of the present application in the long-focus state;

[0055] FIG7 is an optical principle diagram of the optical lens in the first embodiment of the present application switching between a short focus state and a long focus state;

[0056] FIG8 is a schematic structural diagram of the optical lens in a second embodiment of the present application in a short-focus state;

[0057] FIG9 is a schematic structural diagram of the optical lens in a second embodiment of the present application in a telephoto state;

[0058] FIG10 is a schematic structural diagram of the optical lens in the third embodiment of the present application in a short-focus state;

[0059] FIG11 is a schematic structural diagram of the optical lens in a fourth embodiment of the present application in a short-focus state;

[0060] FIG12a is a schematic structural diagram of the optical lens in a fifth embodiment of the present application in a short-focus state;

[0061] FIG12 b is a schematic structural diagram of the optical lens in the fifth embodiment of the present application in a telephoto state;

[0062] FIG12c is a schematic diagram of the internal focusing of the optical lens in the fifth embodiment of the present application when in a short-focus state;

[0063] FIG12 d is an axial spherical aberration curve of the optical lens in the fifth embodiment of the present application when in a short-focus state;

[0064] FIG12e is a field curvature curve and a distortion curve of the optical lens in the fifth embodiment of the present application when in a short-focus state;

[0065] FIG12 f is an axial spherical aberration curve of the optical lens in the fifth embodiment of the present application when in a telephoto state;

[0066] FIG12g is a field curvature curve and a distortion curve of the optical lens in the fifth embodiment of the present application when in a telephoto state;

[0067] FIG12h is a graph showing the relationship between the effective focal length of the optical lens and the moving distances of the first lens group G1 and the second lens group G2 during zooming of the optical lens in the fifth embodiment of the present application;

[0068] FIG12i is a graph showing the relationship between the effective focal length of the optical lens and the focus stroke compression ratio during zooming of the optical lens in the fifth embodiment of the present application;

[0069] FIG12j is a graph showing the relationship between the effective focal length of the optical lens and the first, second, and third optical power distribution ratios during zooming of the optical lens in the fifth embodiment of the present application;

[0070] FIG. 13a is a structural schematic diagram of the optical lens in the sixth embodiment of the present application in a short-focus state;

[0071] FIG. 13b is a structural schematic diagram of the optical lens in the sixth embodiment of the present application in a long-focus state;

[0072] FIG. 13c is an axial spherical aberration curve of the optical lens in the sixth embodiment of the present application in a short-focus state;

[0073] FIG. 13d is a field curvature curve and a distortion curve of the optical lens in the sixth embodiment of the present application in a short-focus state;

[0074] FIG. 13e is an axial spherical aberration curve of the optical lens in the sixth embodiment of the present application in a long-focus state;

[0075] FIG. 13f is a field curvature curve and a distortion curve of the optical lens in the sixth embodiment of the present application in a long-focus state;

[0076] FIG. 13g is a relationship curve diagram between the effective focal length of the optical lens and the zoom ratio in the process of zooming of the optical lens in the sixth embodiment of the present application;

[0077] FIG. 13h is a relationship curve diagram between the effective focal length of the optical lens and the focus stroke compression ratio in the process of focusing of the optical lens in the sixth embodiment of the present application;

[0078] FIG. 13i is a relationship curve diagram between the effective focal length of the optical lens and the first power distribution ratio, the second power distribution ratio, and the third power distribution ratio in the process of zooming of the optical lens in the sixth embodiment of the present application;

[0079] FIG. 13j is a relationship curve diagram between the effective focal length of the optical lens and the moving distance of the first lens group G1 and the moving distance of the second lens group G2 in the process of zooming of the optical lens in the sixth embodiment of the present application;

[0080] FIG. 13k is a relationship curve diagram between the moving distance of the first lens group G1 and the effective focal length F of the optical lens, the combined focal length f g01 of the front lens group G0 and the first lens group G1 in the process of focusing in a short-focus state of the optical lens in the sixth embodiment of the present application;

[0081] FIG. 13l is a relationship curve diagram between the moving distance of the first lens group G1 and the effective focal length F of the optical lens, the combined focal length f g01 of the front lens group G0 and the first lens group G1 in the process of focusing in a long-focus state of the optical lens in the sixth embodiment of the present application;

[0082] FIG. 14a is a schematic view of the optical lens in the seventh embodiment of the present application in a short-focus state and focusing on a far scene;

[0083] FIG. 14b is a schematic view of the optical lens in the seventh embodiment of the present application in a short-focus state and focusing on a near scene;

[0084] FIG. 14c is a schematic view of the optical lens in the seventh embodiment of the present application in a long-focus state and focusing on a far scene;

[0085] FIG. 14d is a schematic view of the optical lens in the seventh embodiment of the present application in a long-focus state and focusing on a near scene;

[0086] FIG. 14e is a curve of axial spherical aberration of the optical lens in the seventh embodiment of the present application in a short-focus state;

[0087] FIG. 14f is a curve of field curvature and distortion of the optical lens in the seventh embodiment of the present application in a short-focus state;

[0088] FIG. 14g is a curve of axial spherical aberration of the optical lens in the seventh embodiment of the present application in a long-focus state;

[0089] FIG. 14h is a curve of field curvature and distortion of the optical lens in the seventh embodiment of the present application in a long-focus state;

[0090] FIG. 14i is a curve of the relationship between the effective focal length and the focusing stroke compression ratio of the optical lens in the seventh embodiment of the present application in the process of zooming;

[0091] FIG. 14j is a curve of the relationship between the effective focal length and the focusing stroke compression ratio of the optical lens in the seventh embodiment of the present application in the process of zooming;

[0092] FIG. 14k is a curve of the relationship between the effective focal length and the moving distance of the first lens group G1 and the moving distance of the second lens group G2 of the optical lens in the seventh embodiment of the present application in the process of zooming;

[0093] FIG. 14l is a curve of the relationship between the effective focal length and the first power distribution ratio, the second power distribution ratio, and the third power distribution ratio of the optical lens in the seventh embodiment of the present application in the process of zooming;

[0094] FIG. 15a is a schematic view of the optical lens in the eighth embodiment of the present application in a short-focus state and focusing on a far scene;

[0095] FIG. 15b is a schematic view of the optical lens in the eighth embodiment of the present application in a short-focus state and focusing on a near scene;

[0096] Fig. 15c is a schematic view of the optical lens in the eighth embodiment of the present application in a long-focus state and focusing on a far scene;

[0097] Fig. 15d is a schematic view of the optical lens in the eighth embodiment of the present application in a long-focus state and focusing on a near scene;

[0098] Fig. 15e is an axial spherical aberration curve of the optical lens in the eighth embodiment of the present application in a short-focus state;

[0099] Fig. 15f is a field curvature curve and a distortion curve of the optical lens in the eighth embodiment of the present application in a short-focus state;

[0100] Fig. 15g is an axial spherical aberration curve of the optical lens in the eighth embodiment of the present application in a long-focus state;

[0101] Fig. 15h is a field curvature curve and a distortion curve of the optical lens in the eighth embodiment of the present application in a long-focus state;

[0102] Fig. 15i is a graph of the relationship between the effective focal length of the optical lens and the focusing stroke compression ratio of the optical lens in the process of zooming of the optical lens in the eighth embodiment of the present application;

[0103] Fig. 15j is a graph of the relationship between the effective focal length of the optical lens and the moving distance of the first lens group G1 and the moving distance of the second lens group G2 of the optical lens in the process of zooming of the optical lens in the eighth embodiment of the present application;

[0104] Fig. 15k is a graph of the relationship between the effective focal length of the optical lens and the first focal power distribution ratio, the second focal power distribution ratio, and the third focal power distribution ratio of the optical lens in the process of zooming of the optical lens in the eighth embodiment of the present application. DETAILED DESCRIPTION

[0105] The following explains and describes the relevant technical terms involved in the embodiments of the present application.

[0106] Focal power, expressed as the reciprocal of the image-side focal length (approximately recognized as the refractive index of air is 1), represents the ability of an optical lens to deflect light rays. A lens or lens group with positive focal power has a positive focal length and has the effect of converging light rays. A lens or lens group with negative focal power has a negative focal length and has the effect of diverging light rays.

[0107] A positive lens, also known as a converging lens or a convex lens, has the effect of converging light rays. Convex lenses are divided into double-convex, plano-convex, and convex-concave (or positive meniscus) forms.

[0108] A negative lens, also known as a diverging lens or a concave lens, has the effect of diverging light rays. Concave lenses are divided into double-concave, plano-concave, and convex-concave forms.

[0109] Optical axis refers to the symmetry axis of an optical system, such as the optical axis of an optical lens, which is the axis passing through the centers of each optical element of the optical lens; the optical axis also refers to the center line of a light beam (light column), around which the light beam rotates without changing the optical characteristics.

[0110] Focal length is a measure of the convergence or divergence of light in an optical system. The focal length is divided into image-side focal length and object-side focal length. The image-side focal length is the distance from the image-side principal plane to the image-side focal point, and similarly, the object-side focal length is the distance from the object-side principal plane to the object-side focal point. The focal length, effective focal length (EFL), and combined focal length referred to in the embodiments of the present application all refer to the image-side focal length.

[0111] The principal plane of a lens (lens group), also known as the principal plane, includes the image-side principal plane and the object-side principal plane. When parallel light is incident on the lens (lens group), the light is refracted and passes through the image-side focal point. The refracted light is reversed and extended to intersect the incident light at a point. The plane passing through this point and perpendicular to the optical axis is the image-side principal plane. The intersection of the image-side principal plane and the optical axis of the optical lens is the image-side principal point. Similarly, light emitted from the object-side focal point is refracted by the lens and becomes parallel light. The extended incident light intersects the parallel light at a point. The plane passing through this point and perpendicular to the optical axis is the object-side principal plane. The intersection of the object-side principal plane and the optical axis of the optical lens is the object-side principal point.

[0112] As shown in FIG. 1a, AB is an incident light ray parallel to the optical axis, which passes through an optical system (which can be a single lens or a lens group formed by multiple lenses, etc.) and exits as light ray E'F' intersecting the optical axis at F'. According to the imaging theory of an ideal optical system, F' is the image point of the object point on the infinite axis, which is called the image-side focal point. When the incident light ray AB and the exit light ray E'F' are reversed and extended, they must intersect at a point, which is denoted as Q'. A plane passing through Q' and perpendicular to the optical axis intersects the optical axis at H', which is called the image-side principal point. The Q'H' plane is called the image-side principal plane. The distance between the principal point H' and the focal point F' is called the image-side focal length.

[0113] As shown in FIG. 1b, F is called the object-side focal point. The extended line of the incident light ray from the focal point F intersects the extended line of the corresponding exit light ray parallel to the optical axis at Q. A plane passing through Q and perpendicular to the optical axis intersects the optical axis at H, which is called the object-side principal point of the optical system. The QH plane is called the object-side principal plane. The distance from the object-side principal point H to the object-side focal point F is called the object-side focal length of the optical system.

[0114] Object distance, as shown in FIG. 2, refers to the distance from the object plane to the object-side principal plane of an optical system, which is denoted by the English letter U. The optical system can be a single lens or a lens group formed by multiple lenses.

[0115] Back focal length, as shown in FIG. 2, refers to the distance from the image plane of the optical system to the image-side principal plane, denoted by the English letter V; wherein the optical system can be a single lens or a lens group formed by multiple lenses.

[0116] Focusing, specifically refers to adjusting the position of the lens group (i.e. focusing lens group) in the optical lens to control the image distance, so that the image plane of the optical lens falls on the photosensitive element, so that the imaging of the optical lens is the clearest.

[0117] Internal focusing (IF for short), refers to the movement of a focusing lens group inside the optical lens to complete focusing when the optical lens is focusing, and the total length (TTL) of the optical lens remains unchanged during focusing.

[0118] Focusing stroke, refers to the movement distance of the focusing lens group during the focusing process of the optical lens. For example, the distance of the focusing lens group moving along the optical axis during the process of switching the optical lens from focusing on the distance to focusing on the near scene is the focusing stroke.

[0119] Image plane, located on the image side of all lenses in the optical lens, and the position where the light rays form an image after passing through each lens in the optical lens in turn.

[0120] MTF (Modulation Transfer Function; Modulation Transfer Function) is the ratio of contrast on the image plane to contrast on the object plane, that is, MTF is the transfer of contrast. MTF = M / m; M = (Imax-Imin) / (Imax+Imin); wherein Imax is the maximum light intensity of the object plane, and Imin is the minimum light intensity of the object plane; m = (imax-imin) / (imax+imin), wherein imax is the maximum light intensity of the image plane, and imin is the minimum light intensity of the image plane; MTF is a quantitative description of the sharpness of the optical lens, to be precise, a quantitative description of the imaging sharpness (including resolution and sharpness) of the optical lens, and the MTF value satisfies 0≤MTF≤1.

[0121] Diaphragm refers to an entity that restricts the light beam in the optical system. The diaphragm can be the edge of the lens, the frame or the specially set aperture screen. The function of the diaphragm can be divided into two aspects, limiting the light beam or limiting the field of view (imaging range). The diaphragm that limits the light beam most in the optical system is called the aperture diaphragm, and the diaphragm that limits the field of view (size) most is called the field diaphragm.

[0122] Pupil, is the image of the aperture diaphragm, the aperture diaphragm is conjugated by the optical system in front of the aperture diaphragm, called the entrance pupil, for short, the entrance pupil; the diameter of the entrance pupil is the diameter of the entrance pupil.

[0123] Relative aperture is the ratio of entrance pupil diameter D to image-side focal length fˊ, denoted as RA, i.e. RA = D / fˊ.

[0124] F number (Fno or F / #) is the reciprocal of relative aperture, i.e. F = fˊ / D; the smaller the F number, the larger the aperture, and the smaller the depth of field; on the contrary, the larger the F number, the smaller the aperture, and the larger the depth of field.

[0125] Total length (TTL) refers to the total length from the surface closest to the object side of the optical lens to the image plane.

[0126] ImgH (Image Hight) represents half of the diagonal length of the effective photosensitive area on the photosensitive element, i.e. image height.

[0127] Abbe number (Abbe) is the ratio of the difference in refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0128] Aberration is the deviation of the image formed by an uncorrected optical system from that of an ideal optical system. Aberration includes spherical aberration, coma, field curvature, astigmatism, distortion, and chromatic aberration.

[0129] Spherical aberration is a wide-beam aberration. The concentric light beams emitted by an on-axis point are no longer concentric after passing through the optical system. The light rays at different incident heights pass through the optical system and intersect the optical axis at different positions, and there is a different degree of deviation from the ideal image point (on-axis image point), which is called axial spherical aberration, simply spherical aberration. Due to spherical aberration, the image point on the Gaussian image plane is not a point, but a circular diffraction spot, and the radius of the diffraction spot is called the sagittal spherical aberration.

[0130] Coma is a wide-beam aberration of off-axis points. For an optical system with coma, the image point of an off-axis object point on the ideal image plane is like a comet-like light spot, with a bright spot formed by the fine light beams near the chief ray, and the image points formed by the light beams of different apertures far from the chief ray are different circular rings far from the chief ray, so this imaging defect is called coma.

[0131] Chromatic aberration (CA) is the difference in refractive index of an optical material for different colors of light, so the light rays of different colors of the same aperture intersect the optical axis at different points after passing through the optical system. The intersection points of the light rays of different apertures and different colors of light with the optical axis are also different. Therefore, at any image plane position, the image of an object point is a colored diffraction spot. The difference in imaging position and size between different colors of light is called chromatic aberration. Chromatic aberration is divided into two types: axial chromatic aberration and sagittal chromatic aberration.

[0132] Axial chromatic aberration: the difference between the imaging positions of two color lights on the axis is called axial chromatic aberration, also known as axial chromatic aberration.

[0133] Lateral chromatic aberration: the same medium has different refractive indexes for different color lights, so the lateral magnification of different color lights for an off-axis object point is not equal,

[0134] This difference is called lateral chromatic aberration, also known as magnification chromatic aberration.

[0135] Distortion, also known as distortion, the intersection height of the chief ray of different fields of view after passing through the optical lens is not equal to the ideal image height, and the difference between the two is the distortion.

[0136] Field curvature, used to represent the difference between the positions of the clearest image points of the central field of view and the non-central field of view after passing through the optical lens group in the optical axis direction. When there is field curvature, the image points outside the paraxial region on the Gaussian plane will become blurred, and the image of the plane object becomes a rotating curved surface, and a perfect object plane image cannot be obtained at the image plane.

[0137] Astigmatism, the meridional image point and the sagittal image point of a thin light beam do not coincide, and the axial distance between the two is called astigmatism.

[0138] Meridional plane, refers to the plane formed by the chief ray emitted by the object point outside the main axis of the optical system and the main axis of the optical system. The light rays located in the meridional plane are collectively referred to as meridional light beams. The point formed by the meridional light beam is called a meridional image point. The image plane where the meridional image point is located is called the meridional image plane.

[0139] Sagittal plane, refers to the plane passing through the chief ray emitted by the object point outside the main axis of the optical system and perpendicular to the meridional plane. The light rays located in the sagittal plane are collectively referred to as sagittal light beams. The point formed by the sagittal light beam is called a sagittal image point. The image plane where the sagittal image point is located is called the sagittal image plane.

[0140] At present, optical lenses have become one of the important components in electronic devices, and through optical lenses, the desired photos can be easily obtained to meet the needs of people taking photos. The optical lenses of the initial electronic devices are fixed focus, that is, the focal length of the optical lens remains unchanged, and the optical lens is called a fixed focus lens. The fixed focus lens only corrects the aberration of one pair of conjugate planes, and when the object plane deviates from the pair of conjugate planes, the image becomes blurred. With the improvement of the imaging quality of electronic devices, fixed focus lenses cannot meet the requirements of photography, so optical lenses with variable focal length (i.e. zoom lenses) have emerged.

[0141] A zoom lens is an optical lens that can change the focal length without changing the shooting position, allowing users to enlarge or reduce the photographed object by adjusting the focal length. The working principle of the zoom lens is based on the physical properties of optical lenses. By changing the position of the lenses inside the optical lens, the focal length of the optical lens can be adjusted to achieve the effect of enlarging or reducing the photographed object. Zoom lenses have been widely used in electronic devices such as mobile phones, tablets, wearable devices, etc. How to design a zoom lens has become one of the important topics in the industry.

[0142] The related art provides an optical lens of an electronic device, which is a zoom lens, comprising a front lens group, a first lens group and a second lens group arranged along the object side to image side direction. The first lens group and the second lens group can move along the lens optical axis of the optical lens to switch the optical lens between a short focus state and a long focus state. The effective focal length of the optical lens when in the short focus state is smaller than the effective focal length of the optical lens when in the long focus state. The first lens group moves linearly along the lens optical axis to change the effective focal length of the optical lens, referred to as the "variable magnification group". The second lens group moves non-linearly along the lens optical axis to compensate for the drift of the image plane of the optical lens, referred to as the "compensation group".

[0143] When the optical lens is in the short focus state or the long focus state, the front lens group and the second lens group remain relatively fixed in the direction along the lens optical axis, and the first lens group can move along the lens optical axis to switch the optical lens between focusing on a near scene and focusing on a far scene.

[0144] However, when the optical lens in the related art switches between focusing on a far scene and focusing on a near scene, the focusing stroke of the first lens group is slightly short, but the driving motor needs to have very high focusing accuracy, which results in a greater design difficulty of the driving motor, and is not conducive to reducing the cost of the camera module of the electronic device.

[0145] Therefore, the present application provides an optical lens, a camera module and an electronic device. By reasonably adjusting the proportion β of the optical power of the front lens group in the system composed of the first lens group and the front lens group, or reasonably adjusting the proportion α of the optical power of the system composed of the first lens group and the front lens group in the optical lens, the focusing accuracy of the optical lens can be improved.

[0146] The technical solutions in some embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings.

[0147] The electronic device in the embodiments of the present application can be a mobile phone, a tablet computer, a notebook computer, a wearable device (such as a smart watch) or other electronic devices with a camera module. In the following, a mobile phone will be taken as an example to specifically introduce the electronic device in the embodiments of the present application. Other types of electronic devices can be specifically set up with reference to the structure of the mobile phone embodiment, which will not be described one by one here.

[0148] FIG. 3 is a schematic view of the back of an electronic device (a mobile phone) in some embodiments of the present application, and FIG. 4 is a cross-sectional view of the electronic device of FIG. 3 along line A-A. As shown in FIGS. 3 and 4, the electronic device includes a housing 200, a display screen 300, and a camera module 100 mounted on the housing 200.

[0149] In some embodiments, as shown in FIGS. 3 and 4, the housing 200 includes a middle frame 210 (also referred to as a front shell or a front frame) and a back cover 220 (also referred to as a battery cover). The display screen 300 is disposed on one side of the middle frame 210, and the back cover 220 is disposed on the other side of the middle frame 210. The back cover 220 and the middle frame 210 enclose a first accommodating space 230, and the camera module 100 is disposed in the first accommodating space 230. The display screen 300 and the middle frame 210 enclose a second accommodating space 240, and electronic devices such as a mainboard 400 are disposed in the second accommodating space 240. The mainboard 400 is connected to the display screen 300 and the camera module 100 through a flexible circuit board, respectively.

[0150] The display screen 300 can be a liquid crystal display screen or an OLED (Organic Light-Emitting Diode) display screen, which is not limited here. In addition to being installed in the first accommodating space 230, the camera module 100 can also be installed in the second accommodating space 240 as a front camera module of the electronic device.

[0151] In some embodiments, as shown in FIGS. 3 and 4, the camera module 100 includes an optical lens 10, a photosensitive element 20, and a filter 30. The light entrance end of the optical lens 10 is disposed opposite a light-transmitting window 221 provided on the back cover 220, and the photosensitive element 20 is located on the image side of the optical lens 10. The filter 30 is located between the optical lens 10 and the photosensitive element 20, so that light can pass through the optical lens 10 to illuminate the photosensitive surface of the photosensitive element 20.

[0152] The optical lens 10 mainly uses the refraction principle of the lens to form an image, that is, the light of the photographed scene passes through the optical lens 10 to form a clear image on the focal plane of the optical lens 10, and the image of the scene is recorded by the photosensitive element 20 located at the focal plane position. The photosensitive element 20 converts the optical image into an electrical signal and transmits it to a processor on the mainboard 400. The processor transmits the electrical signal to the display screen 300 to display the image of the photographed scene on the display screen 300.

[0153] The photosensitive element 20 (also referred to as an image sensor) is a semiconductor chip having a surface containing hundreds of thousands to millions of photodiodes that generate electric charges when exposed to light. The photosensitive element 20 can be a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS), and is not specifically limited herein.

[0154] The optical filter 30 is used to filter out unnecessary wave bands in light, to prevent the photosensitive element 20 from generating false colors or moire, and to improve the effective resolution and color restoration thereof. In some embodiments, as shown in FIG. 3, the optical filter 30 is an infrared filter.

[0155] As shown in FIG. 4, the optical filter 30 can be independently provided or attached to the surface of one of the lenses or prisms of the optical lens 10 to achieve filtering, and is not specifically limited herein.

[0156] In some embodiments, as shown in FIG. 4, the camera module 100 includes a camera housing 40, and the optical lens 10, the photosensitive element 20, and the optical filter 30 are disposed in the camera housing 40.

[0157] FIG. 5 is a structural schematic diagram of the optical lens in a short-focus state in the first embodiment of the present application, and FIG. 6 is a structural schematic diagram of the optical lens in a long-focus state in the first embodiment of the present application. As shown in FIGS. 5 and 6, the optical lens 10 includes a front lens group G0, a first lens group G1, and a second lens group G2 arranged along an object side to an image side direction;

[0158] The optical lens 10 has a lens optical axis 5, and the first lens group G1 and the second lens group G2 are arranged along the lens optical axis 5. The first lens group G1 and the second lens group G2 can respectively move different distances along the lens optical axis 5 relative to the front lens group G0, so as to switch the optical lens 10 between the short-focus state (as shown in FIG. 4) and the long-focus state (as shown in FIG. 5). That is, the distances along the lens optical axis 5 by which the first lens group G1 and the second lens group G2 move during the switching of the optical lens 10 from the short-focus state to the long-focus state are different. Alternatively, the distances along the lens optical axis 5 by which the first lens group G1 and the second lens group G2 move during the switching of the optical lens 10 from the long-focus state to the short-focus state are different.

[0159] As shown in FIGS. 5 and 6, the first lens group G1 can be a variable magnification group and linearly moves along the lens optical axis 5 to change the effective focal length of the optical lens 10, and the second lens group G2 can be a compensation group and non-linearly moves along the lens optical axis 5 to compensate for the drift of the image plane of the optical lens 10.

[0160] As shown in FIG. 5 and FIG. 6, when the optical lens 10 is in the short-focus state or the long-focus state, the front lens group G0 and the second lens group G2 remain relatively fixed in the direction along the lens optical axis 5, and the first lens group G1 is movable along the lens optical axis 5 to switch the optical lens 10 between focusing on a near scene and focusing on a far scene, i.e., to realize the internal focusing of the optical lens 10.

[0161] It needs to be understood that when the optical lens 10 is in the short-focus state, the effective focal length value of the optical lens 10 is an interval, i.e., a short-focus segment, such as 17mm-21mm; when the optical lens 10 is in the long-focus state, the effective focal length value of the optical lens 10 is also an interval, i.e., a long-focus segment, such as 40mm-44mm; the short-focus segment can be any focal segment smaller than the long-focus segment in the optical lens 10, i.e., the maximum value of the short-focus segment is smaller than the minimum value of the long-focus segment; correspondingly, the long-focus segment can be any focal segment larger than the short-focus segment in the optical lens 10, i.e., the minimum value of the long-focus segment is larger than the maximum value of the short-focus segment. In the process of switching the optical lens 10 between the short-focus state and the long-focus state, the optical lens 10 can realize continuous optical zoom, such as the effective focal length of the optical lens 10 can realize continuous change between 17mm-44mm; when the optical lens 10 is in the short-focus state and the first lens group G1 moves along the lens optical axis 5 for internal focusing, the effective focal length of the optical lens 10 will change within the range of the short-focus segment; when the optical lens 10 is in the long-focus state and the first lens group G1 moves along the lens optical axis 5 for internal focusing, the effective focal length of the optical lens 10 will change within the range of the long-focus segment.

[0162] In the formula, the focusing on a near scene of the optical lens 10 refers to the clear imaging of the first object distance of the subject by the optical lens 10, and the focusing on a far scene of the optical lens 10 refers to the clear imaging of the second object distance of the subject by the optical lens 10, the second object distance being larger than the first object distance. For example, the first object distance can be within 900mm; the second object distance can be infinity, i.e., the clear imaging of the subject at infinity by the optical lens 10; here, the “clear imaging” refers to the coincidence of the image plane of the optical lens 10 and the photosensitive surface of the photosensitive element 20.

[0163] In some embodiments, as shown in FIG. 5 and FIG. 6, the optical power of the front lens group G0 and the second lens group G2 is negative, and the optical power of the first lens group G1 is positive.

[0164] By setting the focal power of the front lens group G0 as negative, the total length of the optical lens 10 can be reduced, which is helpful for the miniaturization design of the optical lens 10. Meanwhile, by setting the focal power of the first lens group G1 as positive and the focal power of the second lens group G2 as negative, the focal power of the lens groups of the optical lens 10 forms a negative-positive-negative combination, which can offset the aberrations of the optical lens 10, thereby being beneficial to correct the spherical aberration, chromatic aberration and other aberrations of the optical lens 10, and further being beneficial to improve the imaging quality of the optical lens 10.

[0165] As shown in FIGS. 5 and 6, when the optical lens 10 is switched from the short focal state to the long focal state, the first lens group G1 and the second lens group G2 are both moved towards the direction close to the front lens group G0 (i.e. the left direction in FIGS. 4 and 5). When the optical lens 10 is switched from the long focal state to the short focal state, the first lens group G1 and the second lens group G2 are both moved towards the direction away from the front lens group G0 (i.e. the right direction in FIGS. 5 and 6).

[0166] In some embodiments, as shown in FIGS. 5 and 6, the front lens group G0 includes one positive lens L01 and one negative lens L02 along the direction from the object side to the image side. The first lens group G1 includes a first lens L11, a second lens L12 and a third lens L13 along the direction from the object side to the image side, the first lens L11, the second lens L12 and the third lens L13 all have positive focal power, and there is a gap between any two adjacent lenses among the first lens L11, the second lens L12 and the third lens L13. The second lens group G2 includes a fourth lens L21 and a fifth lens L22 along the direction from the object side to the image side, the fourth lens L21 and the fifth lens L22 both have negative focal power, and there is a gap between the fourth lens L21 and the fifth lens L22.

[0167] By adopting the positive-negative combination of the focal power of the lenses in the front lens group G0, the aberrations of the front lens group G0 can be offset, thereby further correcting the aberrations of the optical lens 10. Since there is a gap between any two adjacent lenses among the first lens L11, the second lens L12 and the third lens L13, and there is a gap between the fourth lens L21 and the fifth lens L22, the surface number of the lenses in the first lens group G1 and the second lens group G2 can be increased, and the design freedom of the first lens group G1 and the second lens group G2 is increased, thereby being beneficial to further correct the aberrations of the optical lens 10.

[0168] In some embodiments, as shown in FIGS. 5 and 6, the front lens group G0 further includes a first turning element 1, one positive lens L01 is arranged on the object side of the first turning element 1, and one negative lens L02 is arranged on the image side of the first turning element 1.

[0169] By disposing the first turning element 1 in the front lens group G0, the optical path of the optical lens 10 can be folded, so that the size of the optical lens 10 in the thickness direction of the electronic device can be reduced, thereby facilitating the reduction of the thickness of the electronic device. By disposing the positive lens L01 on the object side of the first turning element 1 and the negative lens L02 on the image side of the first turning element 1, the positive lens L01 fully utilizes the space on the object side of the first turning element 1, avoiding the positive lens L01 occupying the space on the image side of the first turning element 1, thereby facilitating the reduction of the size of the optical lens 10 in the direction of the lens optical axis 5.

[0170] In some embodiments, as shown in FIGS. 5 and 6, the first turning element 1 is a prism, which includes a first prism entrance surface 11, a first prism exit surface 12, and a first prism reflection surface 13. The first prism entrance surface 11 is disposed towards the object side of the optical lens 10, the first prism exit surface 12 is disposed towards the side where the first lens group G1 is located, and the first prism reflection surface 13 is used to reflect the light beam entering the inside of the first turning element 1 from the first prism entrance surface 11 to the first prism exit surface 12. In this way, the gap between the positive lens L01 and the negative lens L02 fully utilizes the thickness of the prism, so that the positive lens L01 and the negative lens L02 are separated, thereby correcting the field curvature and other aberrations of the optical lens 10 to improve the imaging quality of the optical lens 10.

[0171] In some embodiments, as shown in FIGS. 5 and 6, the object side surface of the positive lens L01 is a convex surface curved towards the object side, and the image side surface of the positive lens L01 is a plane, i.e., the positive lens L01 is a plano-convex positive lens; the object side surface of the negative lens L02 is a concave surface curved towards the image side, and the image side surface of the negative lens L02 is a concave surface curved towards the object side, i.e., the negative lens L02 is a double-concave negative lens. In this way, the positive lens L01, the prism, and the negative lens L02 are equivalent to a meniscus thick lens, thereby correcting the spherical aberration, chromatic aberration, and other aberrations of the optical lens 10 to improve the imaging quality of the optical lens 10.

[0172] In some embodiments, as shown in FIGS. 5 and 6, the positive lens L01 is disposed apart from the first prism entrance surface 11, and the negative lens L02 is disposed apart from the first prism exit surface 12.

[0173] In some embodiments, as shown in FIGS. 5 and 6, the first turning element 1 is a right-angle prism, the included angle between the first prism entrance surface 11 and the first prism exit surface 12 is a right angle, and the included angle between the first prism reflection surface 13 and the first prism entrance surface 11 and the first prism exit surface 12 is an acute angle, such as 45°.

[0174] Of course, the structure of the front lens group G0 is not limited to that shown in FIGS. 5 and 6, and the front lens group G0 can also not include the first turning element 1, and the positive lens L01 and the negative lens L02 are arranged along the lens optical axis 5.

[0175] In the optical lens 10 in the embodiments of the present application, the focal power of the lens group is not limited to the combination of negative, positive and negative, and other combinations can also be used, for example, the combination of positive, positive and negative, that is, the focal power of the front lens group G0 and the first lens group G1 is positive, and the focal power of the second lens group G2 is negative; for example, the combination of positive, negative and positive, that is, the focal power of the front lens group G0 and the second lens group G2 is positive, and the focal power of the first lens group G1 is negative.

[0176] In some embodiments, as shown in FIG. 5, the optical lens 10 further comprises a first fixed barrel 31, the first lens group G1 is arranged in the first fixed barrel 31, and a blocking ring 32 is arranged between adjacent two of the first lens L11, the second lens L12 and the third lens L13. One end of the first fixed barrel 31 is provided with a limiting flange 311, and the other end is provided with a pressing ring 33. The limiting flange 311 and the pressing ring 33 limit the first lens group G1 in the first fixed barrel 31.

[0177] As shown in FIGS. 5 and 6, the pressing ring 33 is arranged at one end (the left end in the figure) of the first fixed barrel 31 close to the front lens group G0, and the limiting flange 311 is arranged at one end (the right end in the figure) of the first fixed barrel 31 away from the front lens group G0. However, the positions of the pressing ring 33 and the limiting flange 311 can also be interchanged. At the same time, at least one of the pressing ring 33 and the limiting flange 311 can be replaced by glue dispensing to fix the position of the lens.

[0178] In some embodiments, as shown in FIG. 5, an edge of at least one of the first lens L11, the second lens L12 and the third lens L13 is provided with a light shielding ring 34 to eliminate stray light at the edge of the first lens group G1. The light shielding ring 34 can be arranged at the edge of the second lens L12.

[0179] In some embodiments, as shown in FIG. 5, the optical lens 10 further comprises a second fixed barrel 35, the second lens group G2 is arranged in the second fixed barrel 35, and a blocking ring 32 is arranged between the fourth lens L21 and the fifth lens L22.

[0180] Of course, in addition to the blocking ring 32, the lenses in the first lens group G1 and the second lens group G2 can also be arranged in the limiting groove of the fixed barrel to separate the lenses.

[0181] In some embodiments, as shown in FIG. 5, an optical stop 34 is arranged at the edge of at least one of the fourth lens L21 and the fifth lens L22 to eliminate stray light at the edge of the second lens group G2. For example, the optical stop 34 can be arranged at the edge of the fourth lens L21 and the fifth lens L24, respectively.

[0182] As shown in FIGS. 5 and 6, the first power distribution ratio β = f g01 / f g0 , and the second power distribution ratio a = F / f g01 ; f g0 is the effective focal length of the front lens group G0, f g01 is the combined focal length of the front lens group G0 and the first lens group G1, and F is the effective focal length of the optical lens 10.

[0183] wherein f g01 is the combined focal length of the front lens group G0 and the first lens group G1 when the optical lens 10 is in any state, and F is the effective focal length of the optical lens 10 when the optical lens 10 is in any state. Here, the “any state” can be a telephoto state or a wide-angle state, which is not specifically limited herein.

[0184] In some embodiments, the first power distribution ratio β satisfies: 0.23 ≤ |β| < 1; for example, β can be -0.384, -0.44, -0.287, -0.313, -0.248, -0.289, -0.246, -0.2455, etc. In this way, |β| can be prevented from being too small, so that the focusing stroke compression ratio ξ can be prevented from being too large, and thus the focusing stroke of the first lens group G1 can be prevented from being too small when the optical lens 10 switches between focusing on a close range and focusing on a far range, which is conducive to reducing the precision requirement of the driving motor of the first lens group G1, and thus conducive to reducing the cost of the camera module of the electronic device.

[0185] wherein the focusing stroke compression ratio ξ is the change in image distance caused by the movement of the focusing lens group by a unit distance, and the expression of the focusing stroke compression ratio ξ is: ξ = [1 - (f g01 / f g0 ) 2 ](F / f g01 ) 2 = (1 - β 2 ) a 2 . The greater the focusing stroke compression ratio ξ, the greater the change in image distance caused by the movement of the focusing lens group by a unit distance. In the focusing process of the optical lens 10, when the change in image distance is constant, the greater the focusing stroke compression ratio ξ, the smaller the focusing stroke; the smaller the focusing stroke compression ratio ξ, the greater the focusing stroke.

[0186] The physical meaning of the focus stroke compression ratio ξ is to use a physical parameter to represent the ratio relationship between the focus stroke of the scheme in which the first lens group G1 is used as a focus lens group (such as the schemes in FIGS. 5 and 6, that is, the inner focusing scheme) and the focus stroke of the scheme in which the front lens group G0, the first lens group G1, and the second lens group G2 move as a whole. The value of the scheme in which the first lens group G1 is used as a focus lens group is that the focus stroke is shorter than the scheme in which the front lens group G0, the first lens group G1, and the second lens group G2 move as a whole.

[0187] The derivation process of the expression of the focus stroke compression ratio ξ can refer to the description in the prior applications with the application numbers 202410875013.7, 202311092486.1, and 202410023387.6 of the applicant, which will not be repeated here.

[0188] In some embodiments, the second refractive power distribution ratio α satisfies: |α|≤2; for example, α can be 1.667, 1.929, 1.533, 1.871, 1.224, 1.936, 1.105, 1.104, etc. In this way, |α| can be prevented from being too large, so that the focus stroke compression ratio ξ can be prevented from being too large, and in turn, the focus stroke of the first lens group G1 when the optical lens 10 switches between focusing on a close range and focusing on a far range can be prevented from being too small, which is beneficial to reduce the precision requirement of the driving motor of the first lens group G1, thereby being beneficial to reduce the cost of the camera module of the electronic device.

[0189] In some embodiments, β satisfies: 0.23≤|β|≤0.45. By setting |β| to be less than or equal to 0.45, |β| can be prevented from being too large, so that the focus stroke compression ratio ξ can be prevented from being too small, and in turn, the focus stroke of the first lens group G1 when the optical lens 10 switches between focusing on a close range and focusing on a far range can be prevented from being too large, which can reduce the volume of the driving motor of the first lens group G1, thereby being beneficial to the miniaturization of the camera module.

[0190] In some embodiments, as shown in FIG. 5, in the case that the optical lens 10 focuses on a far scene (for example, the object distance of the photographed scene is infinite), when the optical lens 10 is in the short-focus state and the effective focal length of the optical lens 10 is the minimum value of the short-focus state, β satisfies: 0.23≤|β|≤0.39; for example, β can be -0.384, -0.287, -0.248, -0.246, -0.245, etc. In this way, it can be avoided that |β| is too large or too small when the optical lens 10 is in the short-focus state, so that the focusing stroke compression ratio ξ can be avoided to be too large or too small, which can not only reduce the focusing stroke of the first lens group G1, but also help to reduce the volume of the driving motor of the first lens group G1; and it can also avoid that the focusing stroke of the first lens group G1 is too short, which reduces the precision requirement of the driving motor of the first lens group G1, and helps to reduce the cost of the camera module.

[0191] In some embodiments, as shown in FIG. 6, in the case that the optical lens 10 focuses on a far scene (for example, the object distance of the photographed scene is infinite), when the optical lens 10 is in the long-focus state and the effective focal length of the optical lens 10 is the maximum value of the long-focus state, β satisfies: 0.27≤|β|≤0.45; for example, β can be -0.44, -0.313, -0.289, etc. In this way, it can be avoided that |β| is too large or too small when the optical lens 10 is in the long-focus state, so that the focusing stroke compression ratio ξ can be avoided to be too large or too small, which can not only reduce the focusing stroke of the first lens group G1, but also help to reduce the volume of the driving motor of the first lens group G1; and it can also avoid that the focusing stroke of the first lens group G1 is too short, which reduces the precision requirement of the driving motor of the first lens group G1, and helps to reduce the cost of the camera module.

[0192] In some embodiments, α satisfies: 1.1≤|α|≤2. By setting |α| to be greater than or equal to 1.1, it can be avoided that |α| is too small, so that the focusing stroke compression ratio ξ can be avoided to be too small, and in turn it can be avoided that the focusing stroke of the first lens group G1 is too large when the optical lens 10 switches between focusing on a near scene and focusing on a far scene, and in this way, it is helpful to avoid that the volume of the driving motor of the first lens group G1 is too large, thereby helping to miniaturize the camera module.

[0193] In some embodiments, as shown in FIG. 5, in the case that the optical lens 10 focuses on a far scene (for example, the object distance of the photographed scene is infinite), when the optical lens 10 is in the short-focus state and the effective focal length of the optical lens 10 is the minimum value in the short-focus state, a satisfies: 1.1≤|a|≤1.67; for example, a can be 1.667, 1.533, 1.224, 1.105, 1.104, etc. In this way, it can be avoided that |a| is too large or too small when the optical lens 10 is in the short-focus state, so that the focusing stroke compression ratio ξ can be avoided to be too large or too small, which can not only reduce the focusing stroke of the first lens group G1, but also help to reduce the volume of the driving motor of the first lens group G1; and it can also avoid that the focusing stroke of the first lens group G1 is too short, which reduces the precision requirement of the driving motor of the first lens group G1, thereby helping to reduce the cost of the camera module.

[0194] In some embodiments, as shown in FIG. 6, in the case that the optical lens 10 focuses on a far scene (for example, the object distance of the photographed scene is infinite), when the optical lens 10 is in the long-focus state and the effective focal length of the optical lens 10 is the maximum value in the long-focus state, a satisfies: 1.86≤|a|≤1.94; for example, a can be 1.929, 1.871, 1.936, etc. In this way, it can be avoided that |a| is too large or too small when the optical lens 10 is in the long-focus state, so that the focusing stroke compression ratio ξ can be avoided to be too large or too small, which can not only reduce the focusing stroke of the first lens group G1, but also help to reduce the volume of the driving motor of the first lens group G1; and it can also avoid that the focusing stroke of the first lens group G1 is too short, which reduces the precision requirement of the driving motor of the first lens group G1, thereby helping to reduce the cost of the camera module.

[0195] In some embodiments, the focusing stroke compression ratio ξ satisfies: ξ≤3.5; for example, ξ can be 2.370, 3.000, 2.156, 3.157, 1.405, 3.436, 1.147, 1.1454, etc. In this way, it can be avoided that the focusing stroke compression ratio ξ is too large, and thus it can be avoided that the focusing stroke of the first lens group G1 is too small when the optical lens 10 switches between focusing on a near scene and focusing on a far scene, which helps to reduce the precision requirement of the driving motor of the first lens group G1, thereby helping to reduce the cost of the camera module of the electronic device.

[0196] In some embodiments, as shown in FIG. 5, in the case that the optical lens 10 focuses on a far scene (for example, the object distance of the photographed scene is infinite), when the optical lens 10 is in the short-focus state and the effective focal length of the optical lens 10 is the minimum value of the short-focus state, ξ satisfies: 1.1≤ξ≤2.4; for example, ξ can be 2.370, 2.156, 1.405, 1.147, 1.1454, etc. In this way, the focusing stroke compression ratio ξ of the optical lens 10 in the short-focus state can be avoided to be too large or too small, which can not only reduce the focusing stroke of the first lens group G1, but also help to reduce the volume of the driving motor of the first lens group G1; and the focusing stroke of the first lens group G1 can also be avoided to be too short, which reduces the precision requirement of the driving motor of the first lens group G1, and helps to reduce the cost of the camera module.

[0197] In some embodiments, as shown in FIG. 6, in the case that the optical lens 10 focuses on a far scene (for example, the object distance of the photographed scene is infinite), when the optical lens 10 is in the long-focus state and the effective focal length of the optical lens 10 is the maximum value of the long-focus state, ξ satisfies: 3.0≤ξ≤3.5; for example, ξ can be 3.000, 3.157, 3.436, etc. In this way, the focusing stroke compression ratio ξ of the optical lens 10 in the long-focus state can be avoided to be too large or too small, which can not only reduce the focusing stroke of the first lens group G1, but also help to reduce the volume of the driving motor of the first lens group G1; and the focusing stroke of the first lens group G1 can also be avoided to be too short, which reduces the precision requirement of the driving motor of the first lens group G1, and helps to reduce the cost of the camera module.

[0198] In some embodiments, as shown in FIG. 5, FIG. 6 and FIG. 7, FIG. 7 is an optical principle diagram of the optical lens 10 in the first embodiment of the present application switching between the short-focus state and the long-focus state, wherein (1) in FIG. 7 shows the optical path diagram of the optical lens 10 in the first embodiment of the present application in the short-focus state, and (2) in FIG. 7 shows the optical path diagram of the optical lens 10 in the first embodiment of the present application in the long-focus state. During the switching process between the short-focus state and the long-focus state of the optical lens 10, the moving distance q of the first lens group G1 satisfies: q≤9.7mm, for example, q can be 3.726mm, 3.962mm, 9.624mm, 7.278mm, 7.792mm, etc. In this way, the moving distance q of the first lens group G1 during the switching between the short-focus state and the long-focus state of the optical lens 10 can be avoided to be too large, which helps to reduce the volume of the driving motor of the first lens group G1, and further helps to miniaturize the camera module.

[0199] It should be understood that the moving distance q of the first lens group G1 includes an optical zoom moving distance q1 and a focusing moving distance q2. The optical zoom moving distance q1 is the moving distance of the first lens group G1 when the optical lens 10 switches between the short-focus state and the long-focus state when focusing on a far scene. The focusing moving distance q2 is the moving distance of the first lens group G1 when the optical lens 10 switches between focusing on a far scene and focusing on a near scene when the optical lens 10 is in the short-focus state or the long-focus state. The moving distance q of the first lens group G1 satisfies q=q1+q2.

[0200] In some embodiments, as shown in FIGS. 5, 6 and 7, the optical zoom moving distance q1 satisfies q1=|mf g1 For example, q1 can be 3.012 mm, 3.075 mm, 9.046 mm, 6.895 mm, 7.409 mm, etc.

[0201] wherein f g1 is the effective focal length of the first lens group G1. The coefficient m is the difference between the value of 1 / β when the optical lens 10 is in the short-focus state and the value of 1 / β when the optical lens 10 is in the long-focus state when focusing on a far scene (for example, the object distance of the photographed scene is infinite), that is:

[0202] wherein β s is the value of the first refractive power distribution ratio β when the optical lens 10 is in the short-focus state and focuses on a far scene; β l is the value of the first refractive power distribution ratio β when the optical lens 10 is in the long-focus state and focuses on a far scene.

[0203] It can be known from the relationship q1=|mf g1 that q1 is related to the first refractive power distribution ratio β and the effective focal length f g1 of the first lens group G1. By reasonably setting the sizes of f g1 and β, the optical zoom moving distance q1 of the first lens group G1 can be controlled, and thus the volume of the driving motor of the first lens group G1 can be controlled, and further the volume of the camera module can be controlled.

[0204] In some embodiments, as shown in FIGS. 5, 6 and 7, the moving distance Δ of the second lens group G2 when the optical lens 10 switches between the short-focus state and the long-focus state satisfies Δ≤15.8 mm. By such setting, the moving distance Δ of the second lens group G2 when the optical lens 10 switches between the short-focus state and the long-focus state can be avoided to be too large, and thus the volume of the driving motor of the second lens group G2 can be reduced, and further the camera module can be miniaturized.

[0205] In some embodiments, as shown in FIG. 5, FIG. 6 and FIG. 7, the moving distance Δ of the second lens group G2 satisfies: Δ = |-nf g2 |≤15.8mm; for example, Δ can be 3.632mm, 4.296mm, 15.779mm, 11.074mm, 12.419mm, etc.

[0206] wherein f g2 is the effective focal length of the second lens group G2, and the coefficient n is the difference between the value of a when the optical lens 10 is in the long-focus state and the value of a when the optical lens 10 is in the short-focus state, i.e. n = a l -a s ;

[0207] wherein a s is the value of the second power distribution ratio a when the optical lens 10 is in the short-focus state; and a l is the value of the second power distribution ratio a when the optical lens 10 is in the long-focus state.

[0208] It can be known from the relationship Δ = |-nf g2 |that Δ is related to the second power distribution ratio a and the effective focal length f g2 of the second lens group G2. By reasonably setting the sizes of f g2 and a, the moving distance Δ of the second lens group G2 can be controlled, so that the volume of the driving motor of the second lens group G2 can be controlled, and further the volume of the camera module can be controlled.

[0209] The derivation process of the relationship q1 = |mf g1 | and Δ = |-nf g2 | is described in detail below.

[0210] As shown in FIG. 7, when the optical lens 10 focuses on a distant scene, and the object distance is infinite (i.e. the object distance is infinite), the light emitted by the object passes through the image m0 formed by the front lens group, and the image distance V0 of the image m0 = fg0. The image m0 passes through the first lens group G1 to form an image m1, and the final image formed by the image m1 passing through the second lens group G2 is IMA. Under the condition of the paraxial light path model, the gap between the image side principal plane of the G0 group in the combined system G01 composed of the G0 group and the G1 group and the object side principal plane of the first lens group G1 is:

[0211] The object distance U1 of the image m0 to the first lens group G1 = d 01 -V0. The image distance V1 of the image m1 is calculated according to the Gaussian formula as follows:

[0212] The optical lens 10 is mainly composed of three lens groups, i.e., the front lens group G0, the first lens group G1, and the second lens group G2. The optical lens 10 can also be regarded as a secondary combination of a combination system G01 (composed of the front lens group G0 and the first lens group G1) and the second lens group G2. The gap between the image-side principal plane of the combination system G01 and the object-side principal plane of the second lens group G2 is:

[0213] According to the definition of the image distance as the distance from the image-side principal plane to the image plane, the distance a between the image-side principal plane of the combination system G01 and the first lens group G1 is:

[0214] The distance d between the image-side principal plane of the first lens group G1 and the object-side principal plane of the second lens group G2 is: 12 , i.e.: 12 = d 012 -a;

[0215] From the above formula, it can be deduced that:

[0216] The object distance U2 of the second lens group G2 is:

[0217] The image distance V2 of the second lens group G2 is:

[0218] When the object is at infinity (the object distance is infinite), the distance from the principal plane of the front lens group G0 to the image plane IMA is defined as TOTR, and TOTR satisfies TOTR = d 01 +d 12 +V2.

[0219] Since the first power distribution ratio β = f g01 / f g0 , the second power distribution ratio α = F / f g01 ;

[0220] Therefore,

[0221] After rearrangement, we have:

[0222] In the optical lens 10, the first lens group G1 and the second lens group G2 move along the lens optical axis 5 to change the effective focal length of the optical lens 10, and the image plane of the optical lens 10 does not change, i.e., TOTR is constant during the zooming process of the optical lens 10. Therefore, the differential of TOTR is 0, i.e.:

[0223] i.e.:

[0224] The zoom differential equation is thus obtained as follows:

[0225] The zoom differential equation of the above formula is solved, and the general solution form is as follows, where c is a constant.

[0226] When the calculation starting point is the telephoto state, define:

[0227] Where, F l is the value of the effective focal length F of the optical lens 10 when the optical lens 10 is in the telephoto state; f g01l is the value of the combined focal length f g01 of the front lens group G0 and the first lens group G1 when the optical lens 10 is in the telephoto state.

[0228] Therefore,

[0229] Eliminate the constant c, and convert it into a quadratic equation about a as follows:

[0230] Define the parameter b as follows:

[0231] Solve the quadratic equation to obtain a as follows:

[0232] According to the calculation starting point, the value of a of the optical lens 10 in the telephoto state or the wide-angle state can be calculated. This calculation starting point can also be from the wide-angle state, and can be freely adjusted according to actual design requirements.

[0233] The solving equation of the above formula needs to satisfy the following conditions: b 2 -4≥0;

[0234] The distance between the image-side principal plane of the front lens group G0 and the object-side principal plane of the first lens group G1:

[0235] The movement of the first lens group G1 realizes the change of d 01 , and thus can be differentiated, and is related to the effective focal length f g1 of the first lens group G1 and β, as follows:

[0236] Integrate the movement amount of the first lens group G1 from 0 to q1, and integrate β from the calculation starting point β s to any state β, and thus the following can be obtained:

[0237] It can be concluded that:

[0238] The optical zoom moving distance q1 of the first lens group G1 is:

[0239] wherein the coefficient

[0240] The movement of the second lens group G2 affects the image distance of the second lens group G2 during the optical zoom of the optical lens 10. According to the foregoing process, the image distance V2 of the second lens group G2 is:

[0241] The differential of the image distance V2 of the second lens group G2 is as follows: dV2 = -f g2 dα;

[0242] Therefore, the movement of the G2 group can be integrated from 0 to Δ, and the parameter α is integrated from the starting point of calculation α s to any state α, and the calculation is as follows:

[0243] The moving distance Δ of the second lens group G2 is converted as follows: Δ = -f g2 × (α - α s )

[0244] Therefore, the moving distance Δ of the second lens group G2 when the optical lens 10 is switched from the short focus state to the long focus state is: Δ = |-f g2 × (α l - α s )| = |-nf g2 |.

[0245] wherein the coefficient n = α l - α s ;

[0246] In some embodiments, as shown in FIG. 4 and FIG. 5, the closest focusing distance U 0min ′ of the optical lens 10 satisfies: U 0min ′ ≥ 75 mm. For example, U 0min ′ can be 88.018 mm, 102.250 mm, 90.174 mm, 75 mm, 465.52 mm, 361.530 mm, 970.174 mm, 984.000 mm, etc. In this way, the optical lens 10 can achieve closer distance shooting, so that the optical lens 10 can capture the details of closer distance scenes, thereby improving the imaging quality of the optical lens 10 at closer distances.

[0247] wherein the closest focusing distance U 0min', refers to the shortest distance at which the optical lens 10 can focus clearly, and the shortest distance refers to the shortest distance from the subject to the object side surface of the first lens of the optical lens 10. When the distance from the subject to the optical lens 10 is greater than or equal to the minimum focusing distance U 0min ', the optical lens 10 can focus accurately and form a clear image; when the distance from the object to the optical lens 10 is less than the minimum focusing distance U 0min ', the optical lens 10 cannot focus correctly, resulting in blurred imaging.

[0248] In some embodiments, as shown in FIG5 , when the optical lens 10 is in a short focus state, the effective focal length f of the front lens group G0 is g0 , the effective focal length f of the first lens group G1 g1 satisfy:

[0249] for example It can be 108.9mm, 97.43mm, 96.71mm, 81.701mm, 79.20mm, etc.

[0250] Among them, the coefficient

[0251] By transforming the relation Setting it to be greater than or equal to 79mm can limit the minimum value of the object distance U0 at which the optical lens 10 can clearly image in the short-focus state, that is, the minimum value of the object distance U0 is 79mm. In this way, the optical lens 10 can achieve closer shooting, and the optical lens 10 can capture the details of the closer scene, thereby improving the imaging quality of the optical lens 10 at a closer distance.

[0252] What needs to be understood is that the minimum value of U0 (i.e. U 0min ) and U 0min ' are two different concepts, the difference is: U 0min is the minimum distance from the object to the main surface of the optical lens 10; U 0min ′ is the shortest distance from the object to the object side surface of the first lens of the optical lens 10.

[0253] The following describes the object distance U0 of the photographed scene when the optical lens 10 is in the short focus state. The process of deducing the relationship between them.

[0254] During the focusing process of the optical lens 10, the first lens group G1 moves, that is, d 01 The distance between the lens element and V1 changes, and the distance between the image m1 formed after the object plane of the photographed scene passes through the front lens group G0 and the first lens group G1 and the principal surface of the front lens group G0 is defined as TOTR1.

[0255] When performing internal focusing on objects at different object distances, the image plane IMA remains unchanged. Since the position of the second lens group G2 is fixed during the internal focusing process, the position of the image plane m1 should also remain unchanged.

[0256] The above equation is called the internal focus differential equation, and its general solution is as follows:

[0257] During the internal focusing process of the optical lens 10, the parameters U1 and β change, but the total length of the optical lens 10 remains unchanged. The general solution is: P(β, U1) = c;

[0258] When the optical lens 10 is in a short-focus state and the object distance of the photographed scene is infinite, U0=∞, which satisfies:

[0259] So define parameter c1:

[0260] Where c = c1f g1 :

[0261] The equation is as follows:

[0262] in:

[0263] therefore,

[0264] Arranged:

[0265] make:

[0266] but:

[0267] The quadratic equation is as follows: β 2 (f g1 +c1d)+(d+c1f g1 )β+f g1 =0;

[0268] Solve the above equation:

[0269] In the above quadratic equation, the conditions for β to be solvable need to meet the following conditions:

[0270] Therefore, we solve the two cases separately. The following is case 1: c1f g1 -d≥2f g1;

[0271] That is,

[0272] After sorting out:

[0273] That is,

[0274] Therefore,

[0275] The following is case 2: c1f g1 -d≤-2f g1 ;

[0276] That is,

[0277] Therefore,

[0278] It is calculated that U0 in case 2 is negative, so case 2 is discarded and case 1 is retained; that is Therefore,

[0279] From the relationship It can be obtained that the size of is reasonably set to limit the size of the minimum value of U0.

[0280] In some embodiments, as shown in FIGS. 5 and 6, the maximum optical zoom ratio Г max satisfies: Г max =j1 / j2≤2.1; for example, Г max may be 1.32, 1.33, 1.85, 2.06, etc.

[0281] Therefore, max is: the maximum ratio of the effective focal length when the optical lens 10 is in the long-focus state to the effective focal length when the optical lens 10 is in the short-focus state in the case that the optical lens 10 focuses on a far scene (for example, the object distance of the photographed scene is infinite); j1 is the value of αβ when the optical lens 10 is in the long-focus state and focuses on a far scene; j2 is the value of αβ when the optical lens 10 is in the short-focus state and focuses on a far scene, that is,

[0282] By setting Г max and j1 / j2 to Г max =j1 / j2≤2.1, the maximum optical zoom ratio Г max can be avoided to be too large, and if Г max ​If the total length of the optical lens 10 is too long, it is not conducive to the miniaturization design of the optical lens 10. It is found through research that when Г max ≤ 2.1, the total length of the optical lens 10 can be prevented from being too long, thereby facilitating the reduction of the volume of the optical lens 10 to facilitate the miniaturization design of the optical lens 10.

[0283] The derivation process of the relationship between the maximum zoom ratio Г max and of the optical lens 10 is described below.

[0284] The optical zoom ratio Г is defined as: the ratio of the effective focal length of the optical lens 10 in any state to the effective focal length F s of the optical lens 10 in the short-focus state when the optical lens 10 focuses on a distant scene (such as the object distance of the photographed scene being infinite), as follows:

[0285] When the optical lens 10 is in the short-focus state, the first power distribution ratio and the second power distribution ratio are respectively:

[0286] When the optical lens 10 is in any state, the first power distribution ratio and the second power distribution ratio are respectively:

[0287] Therefore, the optical zoom ratio can also be converted as:

[0288] The maximum optical zoom ratio of the optical lens 10 is:

[0289] In some embodiments, as shown in FIGS. 5 and 6, the maximum system zoom ratio Г′ max of the optical lens 10 satisfies: Г′ max ≤ 2.5, such as Г′ max may be 1.52, 1.59, 2.41, 2.21, etc. Among them, the maximum system zoom ratio Г′ max of the optical lens 10 is the ratio of the maximum effective focal length of the optical lens 10 to the minimum effective focal length.

[0290] By setting the ratio Г′ max to Г′ max ≤ 2.5, the maximum system zoom ratio Г′ max can be prevented from being too large. If Г′ max is too large, the total length of the optical lens 10 is too long, which is not conducive to the miniaturization design of the optical lens 10. It is found through research that when Г′ maxWhen |γ|≤2.5, the total length of the optical lens 10 can be avoided to be too long, so as to facilitate the reduction of the volume of the optical lens 10, and to facilitate the miniaturization design of the optical lens 10.

[0291] In some embodiments, as shown in FIGS. 5 and 6, the third power distribution ratio γ=F / f g0 ; γ satisfies:

[0292] For example, γ can be -0.44, -0.848, -0.64, -0.586, -0.304, -0.560, -0.271, etc.

[0293] Since |γ|<1.0, it means that the effective focal length of the front lens group G0 is longer than the effective focal length of the optical lens 10, so that when the front lens group G0 makes an anti-shake movement, the MTF loss of the optical lens 10 is less, thereby facilitating the improvement of the imaging quality of the optical lens 10; at the same time, setting |γ| to be less than 1 can also avoid the total length of the optical lens 10 to be too large, so as to reduce the volume and weight of the entire optical lens 10.

[0294] It should be understood that there is a certain relationship between |γ| and the MTF loss: the smaller |γ| is, the smaller the MTF loss of the optical lens 10 is, so that when the front lens group G0 makes an anti-shake movement, the optical lens 10 can ensure a higher imaging quality; the larger |γ| is, the larger the MTF loss of the optical lens 10 is, so that when the front lens group G0 makes an anti-shake movement, the imaging quality of the optical lens 10 decreases.

[0295] As for how the front lens group G0 makes an anti-shake movement, it can be referred to the description in the prior application of the applicant with the patent application number 202311092486.1, which will not be repeated here.

[0296] In some embodiments, as shown in FIG. 5, in the case that the optical lens 10 focuses on a distant scene (such as the object distance of the photographed scene is infinite), when the optical lens 10 is in a short-focus state and the effective focal length of the optical lens 10 is the minimum value in the short-focus state, γ satisfies: 0.27≤|γ|≤0.65; for example, γ can be -0.44, -0.64, -0.304, -0.271, etc. In this way, when the front lens group G0 makes an anti-shake movement, the MTF loss of the optical lens 10 is less; at the same time, it is beneficial to reduce the volume of the optical lens 10 in the short-focus state.

[0297] In some embodiments, as shown in FIG. 6, when the optical lens 10 focuses on a far scene (such as the object distance of the photographed scene is infinite), when the optical lens 10 is in the long-focus state, and the effective focal length of the optical lens 10 is the maximum value of the long-focus state, γ satisfies: 0.55≤|γ|≤0.85; for example, γ can be -0.848, -0.586, -0.560, etc. In this way, when the current lens group G0 makes an anti-shake movement, the MTF loss of the optical lens 10 can be reduced; at the same time, it is beneficial to reduce the volume of the optical lens 10 in the long-focus state. The following describes the derivation process of the relationship between the third power distribution ratio γ of the optical lens 10 and αβ, .

[0298] The focusing stroke compression ratio of the optical lens 10 in the short-focus state is ξ s . l .

[0299] Then:

[0300] After sorting out, we get:

[0301] Therefore, the third power distribution ratio of the optical lens 10 in the short-focus state is:

[0302] The third power distribution ratio of the optical lens 10 in the long-focus state is:

[0303] The third power distribution ratio of the optical lens 10 in any state is:

[0304] In some embodiments, as shown in FIG. 5, FIG. 6 and FIG. 7, the effective light sensing area S1 of the light sensing element 20 when the optical lens 10 is in the long-focus state, and the effective light sensing area S2 of the light sensing element 20 when the optical lens 10 is in the short-focus state satisfy: S1=S2. In this way, the number of pixels on the light sensing element 20 used when the optical lens 10 is in the long-focus state can be increased, thereby facilitating the improvement of the imaging clarity of the optical lens 10 in the long-focus state.

[0305] In some embodiments, as shown in FIG. 5, FIG. 6 and FIG. 7, the effective photosensitive area S1 of the photosensitive element 20 when the optical lens 10 is in the long-focus state, and the effective photosensitive area S2 of the photosensitive element 20 when the optical lens 10 is in the short-focus state satisfy: S1 < S2. In this way, the following technical effects can be achieved: (1) improving the imaging quality of the optical lens 10: by limiting the effective photosensitive area of the optical lens 10 in the long-focus state, the influence of the edge light can be reduced, thereby improving the clarity and sharpness of the image; (2) better controlling the depth of field: when the optical lens is in the long-focus state, the smaller effective photosensitive area helps to better control the depth of field, achieve a more prominent subject and a more blurred background.

[0306] FIG. 8 is a structural schematic diagram of the optical lens 10 in the second embodiment of the present application in the short-focus state, and FIG. 9 is a structural schematic diagram of the optical lens 10 in the second embodiment of the present application in the long-focus state. The main difference between the optical lens 10 shown in FIG. 8, FIG. 9 and the optical lens 10 shown in FIG. 5, FIG. 6 is that the setting position of the positive lens L01 in the front lens group G0 is different, which is described as follows:

[0307] As shown in FIG. 8 and FIG. 9, the front lens group G0 includes the first folding element 1, one positive lens L01 and one negative lens L02, both the positive lens L01 and the negative lens L02 are arranged on the image side of the first folding element 1, and the positive lens L01 is arranged between the negative lens L02 and the first folding element 1, that is, the positive lens L01 and the negative lens L02 are arranged along the direction from the object side to the image side.

[0308] By arranging both the positive lens L01 and the negative lens L02 on the image side of the first folding element 1, that is, on the same side of the first folding element 1, it is not necessary to arrange the mechanical structure for fixing the lens on the object side of the first folding element 1, thereby simplifying the structure of the optical lens 10 and reducing the cost of the optical lens 10.

[0309] In some embodiments, as shown in FIG. 8 and FIG. 9, the positive lens L01 and the negative lens L02 are arranged separately. In this way, the number of lens surfaces in the front lens group G0 can be increased, and the design freedom of the front lens group G0 is increased, thereby being conducive to correcting the aberration of the optical lens 10.

[0310] Of course, the positive lens L01 and the negative lens L02 can also be cemented together to form a double-cemented lens. In this way, the chromatic aberration and other aberrations of the optical lens 10 can be corrected.

[0311] FIG. 10 is a structural schematic diagram of the optical lens 10 in the third embodiment of the present application in the short-focus state. The main difference between the optical lens 10 shown in FIG. 10 and the optical lens 10 shown in FIG. 5, FIG. 6 is that the optical lens 10 in FIG. 10 is additionally provided with the second folding element 2, which is described as follows:

[0312] As shown in FIG. 10, the optical lens 10 further comprises a second turning element 2, which is configured to reflect the outgoing light beam of the second lens group G2 to one side of the lens optical axis 5, i.e., the photosensitive element 20 is arranged on one side of the lens optical axis 5, and the second turning element 2 is configured to reflect the outgoing light beam of the second lens group G2 to the photosensitive element 20.

[0313] By arranging the second turning element 2, the optical path of the optical lens 10 can be folded, so as to reduce the size of the optical lens 10 along the direction of the lens optical axis 5, thereby reducing the occupied space of the optical lens 10 in the electronic device; at the same time, it is beneficial to control the size of the photosensitive surface (i.e., the image surface) of the photosensitive element 20 in the direction parallel to the lens optical axis 5, so that the photosensitive surface of the photosensitive element 20 can be designed to be larger, thereby reducing the occupied space of the photosensitive element 20 in the thickness direction of the electronic device.

[0314] In some embodiments, as shown in FIG. 10, the second turning element 2 can be a prism, comprising a second prism incident surface 21, a second prism exit surface 22, and a second prism reflecting surface 23, the second prism incident surface 21 is arranged towards the side where the second lens group G2 is located, the second prism exit surface 22 is arranged towards the side where the image surface of the optical lens 10 is located, and the second prism reflecting surface 23 is configured to reflect the light beam entering the inside of the second turning element 2 from the second prism incident surface 21 to the second prism exit surface 22.

[0315] The material of the second turning element 2 can be a light-transmitting material such as glass or resin, which is not limited here.

[0316] In some embodiments, as shown in FIG. 10, the second turning element 2 is a right-angle prism, the angle between the second prism incident surface 21 and the second prism exit surface 22 is a right angle, and the angles between the second prism reflecting surface 23 and the second prism incident surface 21 and the second prism exit surface 22 are both acute angles, such as 45°.

[0317] The second turning element 2 is not limited to be a prism, and in other embodiments, the second turning element 2 can also be a mirror.

[0318] FIG. 11 is a structural schematic diagram of the optical lens 10 in the fourth embodiment of the present application in a short-focus state. The main difference between the optical lens 10 shown in FIG. 11 and the optical lens 10 shown in FIG. 10 is that the type of the first turning element 1 is different, which is described as follows:

[0319] As shown in FIG. 11, the first turning element 1 is a mirror. The mirror includes a mirror body and a reflective film covering one side surface of the mirror body. The material of the mirror body can be glass, but is not limited thereto, and other materials can also be used. In some embodiments, the reflective film can be a metal film, such as a silver film, an aluminum film, a gold film, or the like; in other embodiments, the reflective film can also use a dielectric high-reflection film layer to achieve ultra-high reflectivity.

[0320] FIG. 12a is a schematic structural view of the optical lens 10 in the fifth embodiment of the present application in a short-focus state, FIG. 12b is a schematic structural view of the optical lens 10 in the fifth embodiment of the present application in a long-focus state, and FIG. 12c is a schematic view of the internal focusing of the optical lens 10 in the fifth embodiment of the present application in a short-focus state. In FIGS. 12a, 12b, and 12c, the first turning element 1 (a mirror in this embodiment) is unfolded into an equivalent air layer, and the second turning element 2 (a prism in this embodiment) is unfolded into an equivalent parallel flat plate. The main difference between the optical lens 10 shown in FIGS. 12a, 12b, and 12c and the optical lens 10 shown in FIG. 11 is that the lenses in the first lens group G1 and the second lens group G2 are different, as described below.

[0321] As shown in FIGS. 12a and 12b, the second lens L12 includes a positive lens L121 and a negative lens L122 arranged apart from each other. The combined optical power of the positive lens L121 and the negative lens L122 is positive. In this way, the second lens L12 is equivalent to being split into the positive lens L121 and the negative lens L122, which is conducive to increasing the number of lens surfaces in the first lens group G1 and increasing the design freedom of the first lens group G1, thereby facilitating correction of the aberration of the optical lens 10.

[0322] As shown in FIGS. 12a and 12b, the negative lens L122 is arranged between the positive lens L121 and the first lens L11. However, the negative lens L122 can also be arranged between the positive lens L121 and the third lens L13.

[0323] In some embodiments, as shown in FIGS. 12a and 12b, the fifth lens L22 includes a positive lens L221 and a negative lens L222 arranged apart from each other. The combined optical power of the positive lens L221 and the negative lens L222 is negative. In this way, the fifth lens L22 is equivalent to being split into the positive lens L221 and the negative lens L222, which is conducive to increasing the number of lens surfaces in the second rear lens group G2 and increasing the design freedom of the second rear lens group G2, thereby facilitating correction of the aberration of the optical lens 10.

[0324] As shown in FIGS. 12a and 12b, the positive lens L221 can be arranged between the fourth lens L21 and the negative lens L222, but is not limited thereto, and the negative lens L222 can be arranged between the positive lens L221 and the fourth lens L21.

[0325] As shown in FIG. 12c, when the optical lens 10 is in the short-focus state, the front lens group G0 and the second lens group G2 remain relatively fixed in the direction along the lens optical axis 5, and the first lens group G1 is movable along the lens optical axis 5 to switch the optical lens 10 between focusing on a near scene and focusing on a far scene, that is, to realize the internal focusing of the optical lens 10.

[0326] As shown in FIG. 12c, when the optical lens 10 is in the short-focus state, the front lens group G0 and the second lens group G2 remain relatively fixed in the direction along the lens optical axis 5, and the first lens group G1 is movable along the lens optical axis 5 to switch the optical lens 10 between focusing on a near scene and focusing on a far scene, that is, to realize the internal focusing of the optical lens 10.

[0327] The optical lens 10 shown in FIGS. 12a, 12b and 12c will be specifically described below in combination with specific parameters.

[0328] As shown in Tables 1.1-1.3, Table 1.1 shows the main parameters of the optical lens 10 in the short-focus state in the fifth embodiment of the present application, Table 1.2 shows the main parameters of the optical lens 10 in the long-focus state in the fifth embodiment of the present application, and Table 1.3 shows the aspheric coefficients of each surface of the optical elements in the optical lens 10 in the fifth embodiment of the present application.

[0329] Table 1.1 Main parameters of the optical lens 10 in the short-focus state in the fifth embodiment of the present application

[0330] Table 1.2 Main parameters of the optical lens 10 in the long-focus state in the fifth embodiment of the present application

[0331] The parameter values of the radius of curvature, the thickness and the clear aperture radius in Tables 1.1 and 1.2 are all in mm.

[0332] S1 represents the object side surface of the positive lens L01, S2 represents the image side surface of the positive lens L01. Mirror represents the first turning element 1, which is a mirror and has a light ray turning function; S5 represents the object side surface of the negative lens L02, and S6 represents the image side surface of the negative lens L02.

[0333] S0 represents the object plane, i.e., the object being photographed; STO represents the aperture (STOP), which limits the size of the clear aperture through which light enters the optical system and affects the amount of light entering the optical system. STO is located on the object side of the first lens element L11; S7 represents the object-side surface of the first lens element L11, and S8 represents the image-side surface of the first lens element L11. S9 represents the object-side surface of the negative lens element L121, and S10 represents the image-side surface of the negative lens element L121; S13 represents the object-side surface of the third lens element L13, and S14 represents the image-side surface of the third lens element L13. S15 represents the object-side surface of the fourth lens element L21, and S16 represents the image-side surface of the fourth lens element L21. S17 represents the object-side surface of the positive lens element L221, and S18 represents the image-side surface of the positive lens element L221. S19 represents the object-side surface of the negative lens element L222, and S20 represents the image-side surface of the negative lens element L222.

[0334] PRISM represents the second turning element 2, which is a prism and has the function of refraction of light; S21 represents the second prism incident surface 21 of the second turning element 23; S22 represents the second prism exit surface 22 of the second turning element 2; IRCF represents a filter, which is an infrared filter, S23 is the object side surface of the filter, and S24 is the image side surface of the filter; IMA represents the image plane IMAGE, which can be the photosensitive surface of the photosensitive element 20.

[0335] The surface number S in the "Thickness" parameter series in the table n The corresponding value means the surface number S n Surface to surface number S n+1 The distance of the surface on the optical axis; the rules of the positive and negative signs in front of the thickness parameter are as follows: S n The vertex of the surface (the intersection with the optical axis) is the calculation origin, S n+1 The vertex of the surface is positive on the right and negative on the left. Thickness (INF) represents the thickness of the optical lens 10 when focusing on a distant view (i.e., the object distance is infinite); Thickness (Macro) represents the thickness of the optical lens 10 when focusing on a close view (i.e., the object distance is macro).

[0336] The curvature radius in the table is the curvature radius of the surface with the corresponding surface number at the optical axis; the rules for the positive and negative signs in front of the curvature radius parameters are as follows: S n The vertex of the surface is the origin of the calculation. The value is positive if the center of the sphere is on the right, and negative if the center of the sphere is on the left. A curvature radius of INFINITY means that the surface corresponding to this parameter is a plane, and the curvature radius is infinite.

[0337] It should be noted that: the rules for the positive and negative signs in front of the thickness parameters in this table, the rules for the positive and negative signs in front of the curvature radius parameters, and the surface number S in the "Thickness" parameter series in the table nThe explanations of the meanings of the corresponding numerical values, thickness (INF), and thickness (Macro) also apply to the tables below.

[0338] In some embodiments, the aspherical surface in the optical lens 10 can be defined by the following aspherical curve equation:

[0339] where z is the relative distance of a point on the aspherical surface at a distance r from the optical axis to the tangent plane at the intersection point of the aspherical surface and the optical axis; r is the perpendicular distance of a point on the aspherical curve to the optical axis; c is the curvature; K is the conic coefficient; A i is the aspherical coefficient of the i-th order, which can be specifically seen from Table 1.3.

[0340] Table 1.3 Aspherical coefficients of each surface of the optical lens 10 in the fifth embodiment of the present application

[0341] Table 1.4 Basic parameters of the optical path of the optical lens 10 in the fifth embodiment of the present application

[0342] Table 1.5 Related parameters of the optical lens 10 in the fifth embodiment of the present application and the value of ξ; where the object distance is INFINITY

[0343] In Table 1.4 and Table 1.5, INF is the abbreviation of INFINITY, indicating that the object distance of the subject is infinite; Macro indicates that the object distance of the subject is macro, such as 50mm, 100mm, 200mm, 500mm, etc.

[0344] f L01 is the focal length of the positive lens L01; f L02 is the focal length of the negative lens L02; f L11 is the focal length of the first lens L11, f L121 is the focal length of the negative lens L121, f L122 is the focal length of the positive lens L122, f L13 is the focal length of the third lens L13, f L21 is the focal length of the fourth lens L21, f L221 is the focal length of the positive lens L221, f L222 is the focal length of the negative lens L222; f g0 is the effective focal length of the front lens group G0, f g1 is the effective focal length of the first lens group G1, f g2 is the effective focal length of the second lens group G2.

[0345] F is the effective focal length of the optical lens 10 (in any state); F s F is the effective focal length of the optical lens 10 in the short-focus state; F l F is the effective focal length of the optical lens 10 in the long-focus state.

[0346] f g01s f is the combined focal length of the front lens group G0 and the first lens group G1 of the optical lens 10 in the short-focus state. g01l f is the combined focal length of the front lens group G0 and the first lens group G1 of the optical lens 10 in the long-focus state.

[0347] β s β is the first power distribution ratio of the optical lens 10 in the short-focus state. s = f g01s / f g0 , β l β is the first power distribution ratio of the optical lens 10 in the long-focus state. l = f g01l / f g0 .

[0348] α s α is the second power distribution ratio of the optical lens 10 in the short-focus state. s = F s / f g01s , α l α is the second power distribution ratio of the optical lens 10 in the long-focus state. l = F l / f g01l .

[0349] ξ s ξ is the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in the short-focus state. l ξ is the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in the long-focus state.

[0350] γ s γ is the third power distribution ratio of the optical lens 10 in the short-focus state. s = F s / f g0 , γ l γ is the third power distribution ratio of the optical lens 10 in the long-focus state. l = F l / f g0 .

[0351] As shown in Table 1.4 and Table 1.5, when the optical lens 10 focuses on a far scene and the object distance of the photographed scene is infinite, the effective focal length of the optical lens 10 in the short-focus state is 22.983 mm, the effective focal length of the optical lens 10 in the long-focus state is 30.514 mm, and the maximum optical zoom ratio is 1.33.

[0352] The maximum effective focal length of the optical lens 10 is 30.514 mm, the minimum effective focal length is 20.122 mm, and the maximum system zoom ratio is 1.52.

[0353] When the optical lens 10 focuses on a far scene and the object distance of the photographed scene is infinite, the optical zoom moving distance q1 of the first lens group G1 is 3.012 mm, and the moving distance Δ of the second lens group G2 is 3.632 mm during the process that the optical lens 10 switches from the short-focus state to the long-focus state.

[0354] During the process that the optical lens 10 images different object distances of the photographed scene, when the optical lens 10 is in the short-focus state and switches from focusing on a far scene (infinite object distance) to focusing on a close scene (micro distance), the focusing moving distance q2 of the first lens group G1 is 3.188 mm, which is greater than the optical zoom moving distance q1 of the first lens group G1.

[0355] During the process that the optical lens 10 images different object distances of the photographed scene, when the optical lens 10 is in the long-focus state and switches from focusing on a far scene (infinite object distance) to focusing on a close scene (micro distance), the focusing moving distance q2 of the first lens group G1 is 0.714 mm. Therefore, during the process that the optical lens 10 switches from the short-focus state and focuses on a far scene to the long-focus state and focuses on a close scene, the maximum moving distance q of the first lens group G1 is 3.012 mm+0.714 mm=3.726 mm, and the maximum moving distance Δ of the second lens group G2 is 3.632 mm.

[0356] FIG. 12d is a curve of the longitudinal aberration of the optical lens 10 in the fifth embodiment of the present application when the optical lens 10 is in the short-focus state, and FIG. 12e is a curve of the field curvature and a curve of the optical distortion of the optical lens 10 in the fifth embodiment of the present application when the optical lens 10 is in the short-focus state; FIG. 12f is a curve of the longitudinal aberration of the optical lens 10 in the fifth embodiment of the present application when the optical lens 10 is in the long-focus state, and FIG. 12g is a curve of the field curvature and a curve of the optical distortion of the optical lens 10 in the fifth embodiment of the present application when the optical lens 10 is in the long-focus state. FIGS. 12d-12g show the curves of the longitudinal aberration, the curves of the field curvature, and the curves of the optical distortion corresponding to different wave bands (the curves shown include 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm) of the system.

[0357] The axial spherical aberration curve in the figure is used to show the deviation of light of corresponding wavelength emitted at 0 degree field of view from the ideal image point after passing through the optical system; the abscissa is the deviation value in the direction of optical axis, and the ordinate is the normalized coordinate at the pupil. The deviation values in FIG. 12d and FIG. 12f are small, and the correction of the axial spherical aberration of the optical lens is good.

[0358] The field curvature curve in the figure is used to show the deviation of the converging point of light beam of different field of view from the ideal imaging surface, x is the sagittal direction light beam, and y is the meridional direction light beam; the abscissa is the deviation value in the direction of optical axis, and the ordinate is the corresponding field of view. When the field of view value is too large, the image quality of the field of view is poor or there is high-order aberration. The field curvatures in two directions shown in FIG. 12e and FIG. 12g are small, and the system has good focal depth.

[0359] The distortion curve in the figure is used to show the relative deviation amount of the converging point (actual image height) of light beam of different field of view from the ideal image height. The deviation amounts shown in FIG. 12e and FIG. 12g are small, which can ensure that the picture has no obvious distortion.

[0360] Therefore, the optical lens 10 in the fifth embodiment of the present application realizes low light aberration control and obtains clear image quality through reasonable surface type and gap design.

[0361] FIG. 12h is a curve graph of the relationship between the effective focal length of the optical lens 10 and the moving distance of the first lens group G1 and the moving distance of the second lens group G2 in the process of zooming of the optical lens 10 in the fifth embodiment of the present application. The abscissa in FIG. 12h is the effective focal length of the optical lens 10, and the ordinate is the moving distance of the lens group. The curve located on the upper side in FIG. 12h is the relationship curve between the effective focal length of the optical lens 10 and the moving distance of the second lens group G2, and the curve located on the lower side in FIG. 12h is the relationship curve between the effective focal length of the optical lens 10 and the moving distance of the first lens group G1. As shown in FIG. 12h, in the process of zooming of the optical lens 10, with the increase of the moving distance of the first lens group G1 and the second lens group G2, the effective focal length of the optical lens 10 gradually increases.

[0362] FIG. 12i is a curve graph of the relationship between the effective focal length of the optical lens 10 and the focusing stroke compression ratio in the process of zooming of the optical lens 10 in the fifth embodiment of the present application. The abscissa in FIG. 12i is the focusing stroke compression ratio, and the ordinate is the effective focal length of the optical lens 10. As shown in FIG. 12i, in the process of zooming of the optical lens 10, with the increase of the effective focal length of the optical lens 10, the focusing stroke compression ratio also increases, and the relationship curve between the effective focal length of the optical lens 10 and the focusing stroke compression ratio approximately presents a curved curve.

[0363] Figure 12j is a graph showing the relationship between the effective focal length of the optical lens 10 and the first power distribution ratio, the second power distribution ratio, and the third power distribution ratio of the optical lens 10 during zooming in the fifth embodiment of the present application. The horizontal axis in Figure 12j represents the effective focal length of the optical lens 10, and the vertical axis represents the power distribution ratio. The uppermost curve in Figure 12j represents the relationship between the effective focal length of the optical lens 10 and the second power distribution ratio, the middle curve in Figure 12j represents the relationship between the effective focal length of the optical lens 10 and the first power distribution ratio, and the lowermost curve in Figure 12j represents the relationship between the effective focal length of the optical lens 10 and the third power distribution ratio. As shown in Figure 12j, during zooming, as the effective focal length of the optical lens 10 increases, the second power distribution ratio gradually increases, the first power distribution ratio gradually decreases, and the third power distribution ratio gradually decreases.

[0364] Figure 13a is a schematic diagram showing the structure of the optical lens 10 in a short-focus state in the sixth embodiment of the present application, and Figure 13b is a schematic diagram showing the structure of the optical lens 10 in a long-focus state in the sixth embodiment of the present application. In Figures 13a and 13b, the first turning element 1 (a mirror in this embodiment) is unfolded into an equivalent air layer, and the second turning element 2 (a prism in this embodiment) is unfolded into an equivalent parallel flat. The main difference between the optical lens 10 shown in Figures 13a and 13b and the optical lens 10 shown in Figures 12a and 12b is that the optical lens 10 shown in Figures 13a and 13b does not have the second turning element 2, and the photosensitive element 20 and the optical filter are arranged along the lens optical axis 5.

[0365] The optical lens 10 shown in Figures 13a and 13b will be described in detail below in conjunction with specific parameters.

[0366] As shown in Tables 2.1-2.3, Table 2.1 shows the main parameters of the optical lens 10 in a short-focus state in the sixth embodiment of the present application, Table 2.2 shows the main parameters of the optical lens 10 in a long-focus state in the sixth embodiment of the present application, and Table 2.3 shows the aspheric coefficients of the surfaces of the optical elements in the optical lens 10 in the sixth embodiment of the present application.

[0367] Table 2.1 Main parameters of the optical lens 10 in a short-focus state in the sixth embodiment of the present application

[0368] Table 2.2 Main parameters of the optical lens 10 in a long-focus state in the sixth embodiment of the present application

[0369] The units of the parameter values of the curvature radius, the thickness, and the clear aperture radius in Tables 2.1 and 2.2 are mm.

[0370] S0 represents an object plane, i.e. an object; S1 represents an object side surface of the positive lens L011, and S2 represents an image side surface of the positive lens L011. Mirror represents the first folding element 1, which is a mirror and has a light folding function; S5 represents an object side surface of the negative lens L02, and S6 represents an image side surface of the negative lens L02.

[0371] STO represents a stop (STOP) that limits the size of an entrance pupil of a light beam and affects the amount of light entering the optical system, and the stop is located in the object side direction of the first lens L11; S7 represents an object side surface of the first lens L11, and S8 represents an image side surface of the first lens L11. S9 represents an object side surface of the negative lens L121, and S10 represents an image side surface of the negative lens L121; S13 represents an object side surface of the third lens L13, and S14 represents an image side surface of the third lens L13. S15 represents an object side surface of the fourth lens L21, and S16 represents an image side surface of the fourth lens L21. S17 represents an object side surface of the positive lens L221, and S18 represents an image side surface of the positive lens L221. S19 represents an object side surface of the negative lens L222, and S20 represents an image side surface of the negative lens L222.

[0372] IRCF represents an infrared filter, S21 represents an object side surface of the filter, and S22 represents an image side surface of the filter; IMA represents an image plane IMAGE, which can be a light receiving surface of the light receiving element 20.

[0373] Table 2.3 Aspheric surface coefficients of each surface of the optical lens 10 in the sixth embodiment of the present application

[0374] Table 2.4 Basic parameters of the optical path of the optical lens 10 in the sixth embodiment of the present application

[0375] Table 2.5 Related parameters of the optical lens 10 and the value of ξ in the sixth embodiment of the present application; wherein the object distance is INFINITY

[0376] In Table 2.4 and Table 2.5, INF is the abbreviation of INFINITY, indicating that the object distance of the object is infinite; Macro indicates that the object distance of the object is macro, such as 50mm, 100mm, 200mm, 500mm, etc.

[0377] f L01 is the focal length of the positive lens L01; f L02 is the focal length of the negative lens L02; f L11is the focal length of the first lens L11, f L121 is the focal length of the negative lens L121, f L122 is the focal length of the positive lens L122, f L13 is the focal length of the third lens L13, f L21 is the focal length of the fourth lens L21, f L221 is the focal length of the positive lens L221, f L222 is the focal length of the negative lens L222; f g0 is the effective focal length of the front lens group G0, f g1 is the effective focal length of the first lens group G1, f g2 is the effective focal length of the second lens group G2.

[0378] F is the effective focal length of the optical lens 10 (in any state); F s F is the effective focal length of the optical lens 10 in the short-focus state; l is the effective focal length of the optical lens 10 in the telephoto state.

[0379] f g01s is the combined focal length of the front lens group G0 and the first lens group G1 of the optical lens 10 in the short focal state, f g01l It is the combined focal length of the front lens group G0 and the first lens group G1 when the optical lens 10 is in the telephoto state.

[0380] β s is the first focal power distribution ratio of the optical lens 10 in the short-focus state, β s =f g01s / f g0 , β l is the first focal power distribution ratio of the optical lens 10 in the telephoto state, β l =f g01l / f g0 .

[0381] α s is the second focal power distribution ratio of the optical lens 10 in the short focus state, α s =F s / f g01s , α l is the second focal length distribution ratio of the optical lens 10 in the telephoto state, α l =F l / f g01l .

[0382] ξ s is the focus stroke compression ratio of the first lens group G1 when the optical lens 10 is in the short focus state, ξ l is the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in the telephoto state.

[0383] γ s γ s F s f g0 γ l γ l F l f g0 .

[0384] As shown in Table 2.4 and Table 2.5, the effective focal length of the optical lens 10 in the short-focus state is 23.445 mm, the effective focal length in the long-focus state is 31.201 mm, and the maximum optical zoom ratio is 1.33.

[0385] The maximum effective focal length of the optical lens 10 is 30.201 mm, the minimum effective focal length is 19.539 mm, and the maximum system zoom ratio is 1.55.

[0386] In the case that the optical lens 10 focuses on a far scene and the object distance of the photographed scene is infinite, the optical zoom moving distance q1 of the first lens group G1 is 3.075 mm, and the moving distance Δ of the second lens group G2 is 4.296 mm in the process that the optical lens 10 is switched from the short-focus state to the long-focus state.

[0387] In the process of imaging different object distances of the photographed scene, when the optical lens 10 is in the short-focus state and is switched from focusing on a far scene (infinite object distance) to focusing on a close scene (micro distance), the focusing moving distance q2 of the first lens group G1 is 2.676 mm, which is less than the optical zoom moving distance q1 of the first lens group G1.

[0388] In the process of imaging different object distances of the photographed scene, when the optical lens 10 is in the long-focus state and is switched from focusing on a far scene (infinite object distance) to focusing on a close scene (micro distance), the focusing moving distance q2 of the first lens group G1 is 0.887 mm. Therefore, in the process that the optical lens 10 is switched from the short-focus state and focuses on a far scene to the long-focus state and focuses on a close scene, the maximum moving distance q of the first lens group G1 is 3.075 mm+0.887 mm=3.962 mm, and the maximum moving distance Δ of the second lens group G2 is 4.296 mm.

[0389] Fig. 13c is a curve of the longitudinal aberration of the optical lens 10 in the sixth embodiment of the present application when in the short-focus state, Fig. 13d is a curve of the field curvature and a curve of the optical distortion of the optical lens 10 in the sixth embodiment of the present application when in the short-focus state, Fig. 13e is a curve of the longitudinal aberration of the optical lens 10 in the sixth embodiment of the present application when in the long-focus state, and Fig. 13f is a curve of the field curvature and a curve of the optical distortion of the optical lens 10 in the sixth embodiment of the present application when in the long-focus state. Figs. 13c-13f show the curves of the longitudinal aberration, the curves of the field curvature, and the curves of the optical distortion corresponding to different wavebands (including 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm) of the system.

[0390] In the curves of the longitudinal aberration, the horizontal axis represents the deviation value in the direction of the optical axis, and the vertical axis represents the normalized coordinate at the pupil. The deviation values in Figs. 13c and 13e are small, and the correction of the longitudinal aberration of the optical lens is good.

[0391] In the curves of the field curvature, the horizontal axis represents the deviation value in the direction of the optical axis, and the vertical axis represents the corresponding field of view. When the field of view value is too large, the image quality of the field of view is poor or there is high-order aberration. The field curvature values in Figs. 13d and 13f are small, and the system has good depth of focus.

[0392] In the curves of the optical distortion, the horizontal axis represents the relative deviation amount of the beam convergence point (actual image height) from the ideal image height in different fields of view. The deviation amounts in Figs. 13d and 13f are small, which can ensure that there is no obvious distortion of the picture.

[0393] Therefore, the optical lens 10 in the sixth embodiment of the present application can realize low light aberration control and obtain clear image quality through reasonable surface shape and gap design.

[0394] Fig. 13g is a curve of the relationship between the effective focal length of the optical lens 10 and the zoom ratio of the optical lens 10 in the sixth embodiment of the present application during zooming. In Fig. 13g, the horizontal axis represents the zoom ratio, and the vertical axis represents the effective focal length of the optical lens 10. As shown in Fig. 13g, during zooming, as the effective focal length of the optical lens 10 increases, the zoom ratio also increases, and the relationship between the effective focal length of the optical lens 10 and the zoom ratio is approximately a straight line.

[0395] Fig. 13h is a curve diagram of the relationship between the effective focal length of the optical lens 10 and the focusing stroke compression ratio of the optical lens 10 in the process of zooming of the sixth embodiment of the present application. The abscissa in Fig. 13h is the focusing stroke compression ratio, and the ordinate is the effective focal length of the optical lens 10. As shown in Fig. 13h, in the process of zooming of the optical lens 10, as the effective focal length of the optical lens 10 increases, the focusing stroke compression ratio also increases, and the relationship curve between the effective focal length of the optical lens 10 and the focusing stroke compression ratio is a curve.

[0396] Fig. 13i is a curve diagram of the relationship between the effective focal length of the optical lens 10 and the first power distribution ratio, the second power distribution ratio, and the third power distribution ratio of the optical lens 10 in the process of zooming of the sixth embodiment of the present application. The abscissa in Fig. 13i is the effective focal length of the optical lens 10, and the ordinate is the power distribution ratio. The uppermost curve in Fig. 13i is the relationship curve between the effective focal length of the optical lens 10 and the second power distribution ratio, the middle curve in Fig. 13i is the relationship curve between the effective focal length of the optical lens 10 and the first power distribution ratio, and the lowermost curve in Fig. 13i is the relationship curve between the effective focal length of the optical lens 10 and the third power distribution ratio. As shown in Fig. 13i, in the process of zooming of the optical lens 10, as the effective focal length of the optical lens 10 increases, the second power distribution ratio gradually increases, the first power distribution ratio gradually decreases, and the third power distribution ratio gradually decreases.

[0397] Fig. 13j is a curve diagram of the relationship between the effective focal length of the optical lens 10 and the moving distance of the first lens group G1 and the moving distance of the second lens group G2 of the optical lens 10 in the process of zooming of the sixth embodiment of the present application. The abscissa in Fig. 13j is the effective focal length of the optical lens 10, and the ordinate is the moving distance of the lens group. The upper curve in Fig. 13j is the relationship curve between the effective focal length of the optical lens 10 and the moving distance of the second lens group G2, and the lower curve in Fig. 13j is the relationship curve between the effective focal length of the optical lens 10 and the moving distance of the first lens group G1. As shown in Fig. 13j, in the process of zooming of the optical lens 10, as the moving distance of the first lens group G1 and the second lens group G2 increases, the effective focal length of the optical lens 10 gradually increases.

[0398] Fig. 13k is a curve diagram of the relationship between the moving distance of the first lens group G1 and the effective focal length F of the optical lens 10, the combined focal length f g01The horizontal axis in Figure 13k is the moving distance of the first lens group G1, and the vertical axis is the focal length value. The upper curve in Figure 13k is the relationship curve between the moving distance of the first lens group G1 and the effective focal length F of the optical lens 10, and the lower curve in Figure 13k is the relationship curve between the moving distance of the first lens group G1 and the combined focal length f of the front lens group G0 and the first lens group G1. g01 As shown in FIG13k , during the focusing process of the optical lens 10, as the moving distance of the first lens group G1 increases, the effective focal length F of the optical lens 10 gradually decreases, and the combined focal length f of the front lens group G0 and the first lens group G1 is g01 Gradually increase.

[0399] FIG131 shows the moving distance of the first lens group G1, the effective focal length F of the optical lens 10, and the combined focal length f of the front lens group G0 and the first lens group G1 during the focusing process of the optical lens 10 in the telephoto state in the sixth embodiment of the present application. g01 The horizontal axis in Figure 131 is the moving distance of the first lens group G1, and the vertical axis is the focal length value. The upper curve in Figure 131 is the relationship curve between the moving distance of the first lens group G1 and the effective focal length F of the optical lens 10, and the lower curve in Figure 131 is the relationship curve between the moving distance of the first lens group G1 and the combined focal length f of the front lens group G0 and the first lens group G1. g01 As shown in FIG131 , during the focusing process of the optical lens 10, as the moving distance of the first lens group G1 increases, the effective focal length F of the optical lens 10 gradually decreases, and the combined focal length f of the front lens group G0 and the first lens group G1 is g01 Gradually increase.

[0400] Figure 14a is a schematic diagram of the structure of the optical lens 10 in the seventh embodiment of the present application when it is in a short-focus state and focusing on a distant view (the object distance is infinity), Figure 14b is a schematic diagram of the structure of the optical lens 10 in the seventh embodiment of the present application when it is in a short-focus state and focusing on a close view, Figure 14c is a schematic diagram of the structure of the optical lens 10 in the seventh embodiment of the present application when it is in a long-focus state and focusing on a distant view (the object distance is infinity), and Figure 14d is a schematic diagram of the structure of the optical lens 10 in the seventh embodiment of the present application when it is in a long-focus state and focusing on a close view. In Figures 14a, 14b, 14c and 14d, the first turning element 1 (a prism in this embodiment) is unfolded into an equivalent parallel flat plate. The main difference between the optical lens 10 shown in Figures 14a to 14d and the optical lens 10 shown in Figures 5 and 6 is that the composition of the lenses in the first lens group G1 and the second lens group G2 is different, as described below:

[0401] As shown in FIGS. 14a and 14b, the front lens group G0 includes one positive lens L01 and three negative lenses in the direction from the object side to the image side, and the three negative lenses are a negative lens L02, a negative lens L03, and a negative lens L04, respectively.

[0402] The first lens group G1 includes a first lens L11, a second lens L12, and a third lens L13 in the direction from the object side to the image side, the first lens L11 and the third lens L13 each have positive refractive power, the second lens L12 has negative refractive power, and there is a gap between any two adjacent lenses among the first lens L11, the second lens L12, and the third lens L13.

[0403] The second lens group G2 includes a fourth lens L21 and a fifth lens L22 each having negative refractive power in the direction from the object side to the image side, and there is a gap between the fourth lens L21 and the fifth lens L22.

[0404] By adopting the positive and negative combination of the refractive power of the lenses in the front lens group G0, the aberration of the front lens group G0 can be offset, thereby correcting the aberration of the optical lens 10. By adopting the positive, negative, and positive combination of the refractive power of the lenses in the first lens group G1, the aberration of the first lens group G1 can be offset, thereby correcting the aberration of the optical lens 10. Since there is a gap between any two adjacent lenses among the first lens L11, the second lens L12, and the third lens L13, and there is a gap between the fourth lens L21 and the fifth lens L22, the surface number of the lenses in the first lens group G1 and the second lens group G2 can be increased, and the design freedom of the first lens group G1 and the second lens group G2 is increased, thereby facilitating further correction of the aberration of the optical lens 10.

[0405] In some embodiments, as shown in FIGS. 14a and 14b, the positive lens L01 is disposed on the object side of the first folding element 1, and the negative lens L02, the negative lens L03, and the negative lens L04 are disposed on the image side of the first folding element 1.

[0406] By disposing the positive lens L01 on the object side of the first folding element 1 and the three negative lenses on the image side of the first folding element 1, the positive lens L01 and the three negative lenses make full use of the space on the object side and the image side of the first folding element 1, thereby making the front lens group G0 more compact.

[0407] Of course, the front lens group G0 is not limited to three negative lenses, and can also be four negative lenses or five negative lenses, which can be determined according to actual conditions.

[0408] In some embodiments, as shown in FIGS. 14a and 14b, the second lens L12 includes two negative lenses L123 and L124 arranged apart. In this way, the second lens L12 is equivalent to being split into the negative lens L123 and the negative lens L124, which is conducive to increasing the number of lens surfaces in the first lens group G1, increasing the design freedom of the first lens group G1, and thus being conducive to correcting the aberration of the optical lens 10.

[0409] In some embodiments, as shown in FIGS. 14a and 14b, the fifth lens L22 includes a positive lens L221 and a negative lens L222 arranged apart. The combination of the positive lens L221 and the negative lens L222 has a negative focal power. In this way, the fifth lens L22 is equivalent to being split into the positive lens L221 and the negative lens L222, which is conducive to increasing the number of lens surfaces in the second rear lens group G2, increasing the design freedom of the second rear lens group G2, and thus being conducive to correcting the aberration of the optical lens 10.

[0410] As shown in FIGS. 14a-14d, when the optical lens 10 is switched from the short-focus state (the state shown in FIGS. 14a and 14b) to the long-focus state (the state shown in FIGS. 14c and 14d), the first lens group G1 and the second lens group G2 move towards the front lens group G0, and the distance between the first lens group G1 and the second lens group G2 gradually decreases; when the optical lens 10 is switched from the long-focus state to the short-focus state, the first lens group G1 and the second lens group G2 move away from the front lens group G0, and the distance between the first lens group G1 and the second lens group G2 gradually increases.

[0411] As shown in FIGS. 14a and 14b, when the optical lens 10 is in the short-focus state and is switched from focusing on a distant scene (as shown in FIG. 14a) to focusing on a close scene (as shown in FIG. 14b), the first lens group G1 moves towards the front lens group G0; when the optical lens 10 is in the short-focus state and is switched from focusing on a close scene to focusing on a distant scene, the first lens group G1 moves away from the front lens group G0.

[0412] As shown in FIGS. 14c and 14d, when the optical lens 10 is in the long-focus state and is switched from focusing on a distant scene (as shown in FIG. 14c) to focusing on a close scene (as shown in FIG. 14d), the first lens group G1 moves towards the front lens group G0; when the optical lens 10 is in the long-focus state and is switched from focusing on a close scene to focusing on a distant scene, the first lens group G1 moves away from the front lens group G0.

[0413] The optical lens 10 shown in FIGS. 14a, 14b, 14c and 14d will be described in detail below in combination with specific parameters.

[0414] As shown in Table 3.1-Table 3.3, Table 3.1 shows main parameters of the optical lens 10 in the short-focus state in the seventh embodiment of the present application, Table 3.2 shows main parameters of the optical lens 10 in the long-focus state in the seventh embodiment of the present application; and Table 3.3 shows aspheric coefficients of each surface of the optical elements in the optical lens 10 in the seventh embodiment of the present application.

[0415] Table 3.1 Main parameters of the optical lens 10 in the short-focus state in the seventh embodiment of the present application

[0416] Table 3.2 Main parameters of the optical lens 10 in the long-focus state in the seventh embodiment of the present application

[0417] The parameter values of the radius of curvature, thickness, and clear aperture in Table 3.1 and Table 3.2 are all in mm.

[0418] S0 represents an object plane, i.e., a subject; S1 represents an object side surface of the positive lens L011, and S2 represents an image side surface of the positive lens L011. Prism represents the first turning element 1, which is a prism and has a light turning function; S3 represents a first prism incident surface 11 of the prism, S4 represents a first prism reflecting surface 13 of the prism, and S5 represents a first prism emergent surface 12 of the prism. S6 represents an object side surface of the negative lens L02, and S7 represents an image side surface of the negative lens L02; S8 represents an object side surface of the negative lens L03, and S9 represents an image side surface of the negative lens L03; S10 represents an object side surface of the negative lens L04, and S11 represents an image side surface of the negative lens L04.

[0419] S12 represents an object side surface of the first lens L11, and S13 represents an image side surface of the first lens L11. S14 represents an object side surface of the negative lens L123, and S15 represents an image side surface of the negative lens L123; S16 represents an object side surface of the negative lens L124, and S17 represents an image side surface of the negative lens L124; S18 represents an object side surface of the third lens L13, and S19 represents an image side surface of the third lens L13.

[0420] S20 represents an object side surface of the fourth lens L21, and S21 represents an image side surface of the fourth lens L21. S22 represents an object side surface of the positive lens L221, and S23 represents an image side surface of the positive lens L221. S24 represents an object side surface of the negative lens L222, and S25 represents an image side surface of the negative lens L222.

[0421] IRCF represents an optical filter, which is an infrared filter, S26 is an object side surface of the optical filter, and S27 is an image side surface of the optical filter; IMA represents an image plane IMAGE, which can be a light receiving surface of the light receiving element 20.

[0422] Table 3.3 Aspheric surface coefficients of each surface of the optical lens 10 in the seventh embodiment of the present application

[0423] Table 3.4 Basic parameters of the optical path of the optical lens 10 in the seventh embodiment of the present application

[0424] Table 3.5 Related parameters of the optical lens 10 and the value of ξ in the seventh embodiment of the present application; wherein the object distance is INFINITY

[0425] In Table 3.4 and Table 3.5, INF is the abbreviation of INFINITY, indicating that the object distance of the subject is infinite; Macro indicates that the object distance of the subject is macro, such as 50mm, 100mm, 200mm, 500mm, etc.

[0426] f L01 is the focal length of the positive lens L01; f L02 is the focal length of the negative lens L02; f L03 is the focal length of the negative lens L03; f L04 is the focal length of the negative lens L04.

[0427] f L11 is the focal length of the first lens L11, f L121 is the focal length of the negative lens L123, f L122 is the focal length of the negative lens L124, f L13 is the focal length of the third lens L13, f L21 is the focal length of the fourth lens L21, f L221 is the focal length of the positive lens L221, f L222 is the focal length of the negative lens L222; f g0 is the effective focal length of the front lens group G0, f g1 is the effective focal length of the first lens group G1, f g2 is the effective focal length of the second lens group G2.

[0428] F is the effective focal length of the optical lens 10 (in any state); F s is the effective focal length of the optical lens 10 in the short-focus state; F l is the effective focal length of the optical lens 10 in the long-focus state.

[0429] f g01sis the combined focal length of the front lens group G0 and the first lens group G1 of the optical lens 10 in the short focal state, f g01l It is the combined focal length of the front lens group G0 and the first lens group G1 when the optical lens 10 is in the telephoto state.

[0430] β s is the first focal power distribution ratio of the optical lens 10 in the short-focus state, β s =f g01s / f g0 , β l is the first focal power distribution ratio of the optical lens 10 in the telephoto state, β l =f g01l / f g0 .

[0431] α s is the second focal power distribution ratio of the optical lens 10 in the short focus state, α s =F s / f g01s , α l is the second focal length distribution ratio of the optical lens 10 in the telephoto state, α l =F l / f g01l .

[0432] ξ s is the focus stroke compression ratio of the first lens group G1 when the optical lens 10 is in the short focus state, ξ l is the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in the telephoto state.

[0433] γ s is the third focal power distribution ratio when the optical lens 10 is in the short focal state, γ s =F s / f g0 , γ l is the third optical power distribution ratio when the optical lens 10 is in the telephoto state, γ l =F l / f g0 .

[0434] As shown in Table 3.4 and Table 3.5, in the case that the optical lens 10 focuses on a far scene and the object distance of the photographed scene is infinite, the effective focal length of the optical lens 10 in the short-focus state is 20.899 mm, the effective focal length of the optical lens 10 in the long-focus state is 43.125 mm, and the maximum optical zoom ratio is 2.06. In the process of switching the optical lens 10 from focusing on a far scene (infinite object distance) to focusing on a near scene (micro distance), the effective focal length of the optical lens 10 in the short-focus state is shortened, and the effective focal length when focusing on a far scene (infinite object distance) is 1.17 times the effective focal length when focusing on a near scene (micro distance).

[0435] The maximum effective focal length of the optical lens 10 is 43.125 mm, the minimum effective focal length is 17.886 mm, and the maximum system zoom ratio is 2.41.

[0436] In the case that the optical lens 10 focuses on a far scene and the object distance of the photographed scene is infinite, in the process of switching the optical lens 10 from the short-focus state to the long-focus state, the optical zoom moving distance q1 of the first lens group G1 is 9.046 mm, and the moving distance Δ of the second lens group G2 is 15.779 mm.

[0437] In the process of imaging different object distances of the photographed scene, when the optical lens 10 is in the short-focus state and is switched from focusing on a far scene (infinite object distance) to focusing on a near scene (micro distance), the focusing moving distance q2 of the first lens group G1 is 5.162 mm, which is less than the optical zoom moving distance q1 of the first lens group G1.

[0438] In the process of imaging different object distances of the photographed scene, when the optical lens 10 is in the long-focus state and is switched from focusing on a far scene (infinite object distance) to focusing on a near scene (micro distance 970 mm), the focusing moving distance q2 of the first lens group G1 is 0.578 mm. Therefore, in the process of switching the optical lens 10 from the short-focus state and focusing on a far scene to the long-focus state and focusing on a near scene, the maximum moving distance q of the first lens group G1 is 9.046 mm+0.578 mm=9.624 mm, and the maximum moving distance Δ of the second lens group G2 is 15.779 mm.

[0439] Fig. 14e is a curve of the longitudinal aberration of the optical lens 10 in the seventh embodiment of the present application when in the short-focus state, Fig. 14f is a curve of the field curvature and a curve of the optical distortion of the optical lens 10 in the seventh embodiment of the present application when in the short-focus state, Fig. 14g is a curve of the longitudinal aberration of the optical lens 10 in the seventh embodiment of the present application when in the long-focus state, and Fig. 14h is a curve of the field curvature and a curve of the optical distortion of the optical lens 10 in the seventh embodiment of the present application when in the long-focus state. Figs. 14e-14h show the curves of the longitudinal aberration, the curves of the field curvature, and the curves of the optical distortion corresponding to different wavebands (including 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm) of the system.

[0440] The curve of the longitudinal aberration in the figure is used to show the deviation of the light of a corresponding wavelength emitted at 0 degree field of view from an ideal image point after passing through the optical system; the abscissa is the deviation value in the direction of the optical axis, and the ordinate is the normalized coordinate at the pupil. The deviation values in Figs. 14e and 14g are small, and the correction of the longitudinal aberration of the optical lens is good.

[0441] The curve of the field curvature in the figure is used to show the deviation of the convergent points of the light beams of different fields of view from an ideal imaging surface, x is the sagittal direction light beam, and y is the meridional direction light beam; the abscissa is the deviation value in the direction of the optical axis, and the ordinate is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there is high-order aberration. The field curvatures in both directions shown in Figs. 14f and 14h are small, and the system has good depth of focus.

[0442] The curve of the distortion in the figure is used to show the relative deviation amount of the convergent points (actual image height) of the light beams of different fields of view from an ideal image height. The deviation amounts shown in Figs. 14f and 14h are small, which can ensure that there is no obvious distortion of the picture.

[0443] Therefore, the optical lens 10 in the seventh embodiment of the present application realizes low light aberration control and obtains clear image quality through reasonable surface shape and gap design, etc.

[0444] Fig. 14i is a curve graph of the relationship between the effective focal length of the optical lens 10 and the focus stroke compression ratio of the optical lens 10 in the seventh embodiment of the present application in the process of zooming, the abscissa in Fig. 14i is the focus stroke compression ratio, and the ordinate is the effective focal length of the optical lens 10. As shown in Fig. 14i, in the process of zooming, as the effective focal length of the optical lens 10 increases, the focus stroke compression ratio also increases, and the relationship between the effective focal length of the optical lens 10 and the focus stroke compression ratio is approximately a straight line.

[0445] FIG. 14j is a curve diagram of the relationship between the effective focal length of the optical lens 10 and the focus stroke compression ratio of the optical lens 10 in the seventh embodiment of the present application during zooming. The abscissa in FIG. 14j is the focus stroke compression ratio, and the ordinate is the effective focal length of the optical lens 10. As shown in FIG. 14j, during zooming, as the effective focal length of the optical lens 10 increases, the focus stroke compression ratio also increases, and the relationship between the effective focal length of the optical lens 10 and the focus stroke compression ratio is approximately a straight line.

[0446] FIG. 14k is a curve diagram of the relationship between the effective focal length of the optical lens 10 and the movement distance of the first lens group G1 and the movement distance of the second lens group G2 of the optical lens 10 in the seventh embodiment of the present application during zooming. The abscissa in FIG. 14k is the effective focal length of the optical lens 10, and the ordinate is the movement distance of the lens group. The upper curve in FIG. 14k is the relationship between the effective focal length of the optical lens 10 and the movement distance of the second lens group G2, and the lower curve in FIG. 14k is the relationship between the effective focal length of the optical lens 10 and the movement distance of the first lens group G1. As shown in FIG. 14k, during zooming, as the movement distance of the first lens group G1 and the second lens group G2 increases, the effective focal length of the optical lens 10 gradually increases.

[0447] FIG. 14l is a curve diagram of the relationship between the effective focal length of the optical lens 10 and the first power distribution ratio, the second power distribution ratio, and the third power distribution ratio of the optical lens 10 in the seventh embodiment of the present application during zooming. The abscissa in FIG. 14l is the effective focal length of the optical lens 10, and the ordinate is the power distribution ratio. The uppermost curve in FIG. 14l is the relationship between the effective focal length of the optical lens 10 and the second power distribution ratio, the middle curve in FIG. 14l is the relationship between the effective focal length of the optical lens 10 and the first power distribution ratio, and the lowermost curve in FIG. 14l is the relationship between the effective focal length of the optical lens 10 and the third power distribution ratio. As shown in FIG. 14l, during zooming, as the effective focal length of the optical lens 10 increases, the second power distribution ratio gradually increases, the first power distribution ratio gradually decreases, and the third power distribution ratio gradually decreases.

[0448] Figure 15a is a schematic view of the optical lens 10 in the eighth embodiment of the present application in a short-focus state and focusing on a far scene (object distance is infinite), Figure 15b is a schematic view of the optical lens 10 in the eighth embodiment of the present application in a short-focus state and focusing on a near scene, Figure 15c is a schematic view of the optical lens 10 in the eighth embodiment of the present application in a long-focus state and focusing on a far scene (object distance is infinite), and Figure 15d is a schematic view of the optical lens 10 in the eighth embodiment of the present application in a long-focus state and focusing on a near scene. In Figures 15a, 15b, 15c and 15d, the first turning element 1 (a prism in this embodiment) is unfolded into an equivalent parallel flat plate. The main difference between the optical lens 10 shown in Figures 15a-15d and the optical lens 10 shown in Figures 14a-14d is that the parameters of the optical lens 10 are different, as described below:

[0449] As shown in Figures 15a and 15b, when the optical lens 10 is in a short-focus state and switches from focusing on a far scene (as shown in Figure 15a) to focusing on a near scene (as shown in Figure 15b), the first lens group G1 moves towards the front lens group G0; when the optical lens 10 is in a short-focus state and switches from focusing on a near scene to focusing on a far scene, the first lens group G1 moves away from the front lens group G0.

[0450] As shown in Figures 15c and 15d, when the optical lens 10 is in a long-focus state and switches from focusing on a far scene (as shown in Figure 15c) to focusing on a near scene (as shown in Figure 15d), the first lens group G1 moves towards the front lens group G0; when the optical lens 10 is in a long-focus state and switches from focusing on a near scene to focusing on a far scene, the first lens group G1 moves away from the front lens group G0.

[0451] The optical lens 10 shown in Figures 15a, 15b, 15c and 15d will be described in detail below in conjunction with specific parameters.

[0452] As shown in Tables 4.1-4.3, Table 4.1 shows the main parameters of the optical lens 10 in the eighth embodiment of the present application in a short-focus state, Table 4.2 shows the main parameters of the optical lens 10 in the eighth embodiment of the present application in a long-focus state, and Table 4.3 shows the aspheric coefficients of each surface of the optical elements in the optical lens 10 in the eighth embodiment of the present application.

[0453] Table 4.1 Main parameters of the optical lens 10 in the eighth embodiment of the present application in a short-focus state

[0454] Table 4.2 Main parameters of the optical lens 10 in the eighth embodiment of the present application in a long-focus state

[0455] The units of the parameter values of the curvature radius, the thickness, and the clear aperture in Table 4.1 and Table 4.2 are mm.

[0456] S0 represents an object plane, i.e., a subject; S1 represents an object side surface of the positive lens L011, and S2 represents an image side surface of the positive lens L011. Prism represents the first turning element 1, which is a prism and has a light turning function; S3 represents a first prism incident surface 11 of the prism, S4 represents a first prism reflecting surface 13 of the prism, and S5 represents a first prism emergent surface 12 of the prism. S6 represents an object side surface of the negative lens L02, and S7 represents an image side surface of the negative lens L02; S8 represents an object side surface of the negative lens L03, and S9 represents an image side surface of the negative lens L03; S10 represents an object side surface of the negative lens L04, and S11 represents an image side surface of the negative lens L04.

[0457] S12 represents an object side surface of the first lens L11, and S13 represents an image side surface of the first lens L11. S14 represents an object side surface of the negative lens L123, and S15 represents an image side surface of the negative lens L123; S16 represents an object side surface of the negative lens L124, and S17 represents an image side surface of the negative lens L124; S18 represents an object side surface of the third lens L13, and S19 represents an image side surface of the third lens L13.

[0458] S20 represents an object side surface of the fourth lens L21, and S21 represents an image side surface of the fourth lens L21. S22 represents an object side surface of the positive lens L221, and S23 represents an image side surface of the positive lens L221. S24 represents an object side surface of the negative lens L222, and S25 represents an image side surface of the negative lens L222.

[0459] IRCF represents an infrared filter, S26 represents an object side surface of the infrared filter, and S27 represents an image side surface of the infrared filter; IMA represents an image plane IMAGE, which can be a photosensitive surface of a photosensitive element 20.

[0460] Table 4.3 Aspherical surface coefficients of each surface of the optical lens 10 in the eighth embodiment of the present application

[0461] Table 4.4 Basic parameters of an optical path of the optical lens 10 in the eighth embodiment of the present application

[0462] Table 4.5 Related parameters of the optical lens 10 and the value of ξ in the eighth embodiment of the present application; wherein the object distance is INFINITY

[0463] In Tables 4.4 and 4.5, INF is short for INFINITY, indicating that the object distance of the subject is infinite; Macro indicates that the object distance of the subject is macro, such as 50mm, 100mm, 200mm, 500mm, etc.

[0464] f L01 is the focal length of the positive lens L01; f L02 is the focal length of the negative lens L02; f L03 is the focal length of the negative lens L03; f L04 is the focal length of the negative lens L04.

[0465] f L11 is the focal length of the first lens L11; f L121 is the focal length of the negative lens L123; f L122 is the focal length of the negative lens L124; f L13 is the focal length of the third lens L13; f L21 is the focal length of the fourth lens L21; f L221 is the focal length of the positive lens L221; f L222 is the focal length of the negative lens L222; f g0 is the effective focal length of the front lens group G0; f g1 is the effective focal length of the first lens group G1; f g2 is the effective focal length of the second lens group G2.

[0466] F is the effective focal length of the optical lens 10 (in any state); F s is the effective focal length of the optical lens 10 in the short-focus state; F l is the effective focal length of the optical lens 10 in the long-focus state.

[0467] f g01s is the combined focal length of the front lens group G0 and the first lens group G1 of the optical lens 10 in the short-focus state; f g01l is the combined focal length of the front lens group G0 and the first lens group G1 of the optical lens 10 in the long-focus state.

[0468] β s is the first power distribution ratio of the optical lens 10 in the short-focus state; β s = f g01s / f g0 , β l is the first power distribution ratio of the optical lens 10 in the long-focus state; β l = f g01l / f g0 .

[0469] α sthe second power distribution ratio of the optical lens 10 in the short-focus state, a s = F s / f g01s , a l the second power distribution ratio of the optical lens 10 in the long-focus state, a l = F l / f g01l .

[0470] ξ s the focus stroke compression ratio of the first lens group G1 when the optical lens 10 is in the short-focus state, ξ l the focus stroke compression ratio of the first lens group G1 when the optical lens 10 is in the long-focus state.

[0471] γ s the third power distribution ratio of the optical lens 10 in the short-focus state, γ s = F s / f g0 , γ l the third power distribution ratio of the optical lens 10 in the long-focus state, γ l = F l / f g0 .

[0472] As shown in Table 4.4 and Table 4.5, when the optical lens 10 focuses on a far scene and the object distance of the photographed scene is infinite, the effective focal length of the optical lens 10 in the short-focus state is 19.156 mm, the effective focal length of the optical lens 10 in the long-focus state is 35.319 mm, and the maximum optical zoom ratio is 1.85.

[0473] The maximum effective focal length of the optical lens 10 is 35.319 mm, the minimum effective focal length is 15.993 mm, and the maximum system zoom ratio is 2.21.

[0474] When the optical lens 10 focuses on a far scene and the object distance of the photographed scene is infinite, the optical zoom moving distance q1 of the first lens group G1 is 6.895 mm, and the moving distance Δ of the second lens group G2 is 11.074 mm during the process of switching the optical lens 10 from the short-focus state to the long-focus state.

[0475] When the optical lens 10 is in the short-focus state and switches from focusing on a far scene (infinite object distance) to focusing on a close scene (micro distance), the focus moving distance q2 of the first lens group G1 is 4.322 mm, which is less than the optical zoom moving distance q1 of the first lens group G1, during the process of imaging different object distances of the photographed scene.

[0476] In the process of imaging different object distances, when the optical lens 10 is in the long-focus state and is switched from focusing on a far scene (infinite object distance) to focusing on a near scene (macro object distance), the focusing movement distance q2 of the first lens group G1 is 0.383 mm. Therefore, in the process of switching from the short-focus state and focusing on a far scene to the long-focus state and focusing on a near scene, the maximum movement distance q of the first lens group G1 is 6.895 mm + 0.383 mm = 7.278 mm, and the maximum movement distance Δ of the second lens group G2 is 11.074 mm.

[0477] FIG. 15e is a curve of the longitudinal aberration of the optical lens 10 in the eighth embodiment of the present application when in the short-focus state, and FIG. 15f is a curve of the field curvature and a curve of the optical distortion of the optical lens 10 in the eighth embodiment of the present application when in the short-focus state. FIG. 15g is a curve of the longitudinal aberration of the optical lens 10 in the eighth embodiment of the present application when in the long-focus state, and FIG. 15h is a curve of the field curvature and a curve of the optical distortion of the optical lens 10 in the eighth embodiment of the present application when in the long-focus state. FIGS. 15e-15h show the curves of the longitudinal aberration, the curves of the field curvature, and the curves of the optical distortion corresponding to different wave bands (including 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm) of the system.

[0478] The curve of the longitudinal aberration in the figure is used to show the deviation of light of a corresponding wavelength emitted at 0-degree field of view from an ideal image point after passing through the optical system. The abscissa is the deviation value in the direction of the optical axis, and the ordinate is the normalized coordinate at the pupil. The deviation values in FIGS. 15e and 15g are small, and the correction of the longitudinal aberration of the optical lens is good.

[0479] The curve of the field curvature in the figure is used to show the deviation of convergent points of light beams of different fields of view from an ideal imaging surface. x is the sagittal direction light beam, and y is the meridional direction light beam. The abscissa is the deviation value in the direction of the optical axis, and the ordinate is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there is high-order aberration. The field curvatures in both directions shown in FIGS. 15f and 15h are small, and the system has good depth of focus.

[0480] The curve of the distortion in the figure is used to show the relative deviation amount of convergent points (actual image height) of light beams of different fields of view from an ideal image height. The deviation amounts shown in FIGS. 15f and 15h are small, which can ensure that there is no obvious distortion of the picture.

[0481] Therefore, the optical lens 10 in the eighth embodiment of the present application realizes low light aberration control and obtains clear image quality through reasonable surface shape and gap design.

[0482] Fig. 15i is a curve diagram of the relationship between the effective focal length of the optical lens 10 and the focusing stroke compression ratio of the optical lens 10 in the process of zooming of the eighth embodiment of the present application. The abscissa in Fig. 15i is the focusing stroke compression ratio, and the ordinate is the effective focal length of the optical lens 10. As shown in Fig. 15i, in the process of zooming of the optical lens 10, as the effective focal length of the optical lens 10 increases, the focusing stroke compression ratio also increases, and the relationship between the effective focal length of the optical lens 10 and the focusing stroke compression ratio is approximately a straight line.

[0483] Fig. 15j is a curve diagram of the relationship between the effective focal length of the optical lens 10 and the moving distance of the first lens group G1 and the moving distance of the second lens group G2 of the optical lens 10 in the process of zooming of the eighth embodiment of the present application. The abscissa in Fig. 15j is the effective focal length of the optical lens 10, and the ordinate is the moving distance of the lens group. The upper curve in Fig. 15j is the relationship between the effective focal length of the optical lens 10 and the moving distance of the second lens group G2, and the lower curve in Fig. 15j is the relationship between the effective focal length of the optical lens 10 and the moving distance of the first lens group G1. As shown in Fig. 15j, in the process of zooming of the optical lens 10, as the moving distance of the first lens group G1 and the second lens group G2 increases, the effective focal length of the optical lens 10 gradually increases.

[0484] Fig. 15k is a curve diagram of the relationship between the effective focal length of the optical lens 10 and the first power distribution ratio, the second power distribution ratio, and the third power distribution ratio of the optical lens 10 in the process of zooming of the eighth embodiment of the present application. The abscissa in Fig. 15k is the effective focal length of the optical lens 10, and the ordinate is the power distribution ratio. The uppermost curve in Fig. 15k is the relationship between the effective focal length of the optical lens 10 and the second power distribution ratio, the middle curve in Fig. 15k is the relationship between the effective focal length of the optical lens 10 and the first power distribution ratio, and the lowermost curve in Fig. 15k is the relationship between the effective focal length of the optical lens 10 and the third power distribution ratio. As shown in Fig. 15k, in the process of zooming of the optical lens 10, as the effective focal length of the optical lens 10 increases, the second power distribution ratio gradually increases, the first power distribution ratio gradually decreases, and the third power distribution ratio gradually decreases.

[0485] As shown in Tables 5.1-5.3, Table 5.1 is the main parameters of the optical lens 10 in the short-focus state of the ninth embodiment of the present application, Table 5.2 is the related parameters of the optical lens 10 and the value of ξ of the ninth embodiment of the present application, and Table 5.3 is the basic parameters of the optical path of the optical lens 10 of the ninth embodiment of the present application.

[0486] The main difference between the optical lens 10 in the ninth embodiment of the present application and the optical lens 10 in the eighth embodiment of the present application lies in that the parameters of the optical lens 10 are different. In the optical lens 10 in the ninth embodiment of the present application, the effective focal length in the short-focus state (object distance is infinity) is adjusted to 17.116 mm, the effective focal length in the long-focus state (object distance is infinity) is adjusted to 35.319 mm, and the maximum zoom ratio is 2.06, which is described as follows:

[0487] Table 5.1 Main parameters of the optical lens 10 in the ninth embodiment of the present application in the short-focus state

[0488] Table 5.2 Related parameters of the optical lens 10 in the ninth embodiment of the present application and the value of ξ; wherein the object distance is INFINITY

[0489] Table 5.3 Basic parameters of the optical path of the optical lens 10 in the ninth embodiment of the present application

[0490] In Table 5.1 to Table 5.3, INF is the abbreviation of INFINITY, indicating that the object distance of the photographed scene is infinite; Macro indicates that the object distance of the photographed scene is macro, such as 50 mm, 100 mm, 200 mm, 500 mm, etc.

[0491] As shown in Table 5.2 and Table 5.3, in the case that the optical lens 10 focuses on a distant scene and the object distance of the photographed scene is infinite, the effective focal length of the optical lens 10 in the short-focus state is 17.116 mm, the effective focal length in the long-focus state is 35.319 mm, and the maximum optical zoom ratio is 2.06.

[0492] The maximum effective focal length of the optical lens 10 is 35.319 mm, the minimum effective focal length is 15.993 mm, and the maximum system zoom ratio is 2.21.

[0493] In the case that the optical lens 10 focuses on a distant scene and the object distance of the photographed scene is infinite, in the process of switching the optical lens 10 from the short-focus state to the long-focus state, the optical zoom moving distance q1 of the first lens group G1 is 7.409 mm, and the moving distance Δ of the second lens group G2 is 12.924 mm.

[0494] In the process of imaging different object distances of the photographed scene, when the optical lens 10 is in the short-focus state and is switched from focusing on a distant scene (object distance is infinite) to focusing on a close scene (object distance is macro), the focusing moving distance q2 of the first lens group G1 is 4.837 mm, which is less than the optical zoom moving distance q1 of the first lens group G1.

[0495] In the process of imaging different object distances, when the optical lens 10 is in the long-focus state (the maximum effective focal length value), and the focus is switched from the far scene (infinite object distance) to the near scene (micro distance), the focus moving distance q2 of the first lens group G1 is 0.383 mm. Therefore, in the process of switching from the short-focus state and focusing on the far scene to the long-focus state and focusing on the near scene, the maximum moving distance q of the first lens group G1 is 7.409 mm + 0.383 mm = 7.792 mm, and the maximum moving distance Δ of the second lens group G2 is 12.924 mm.

[0496] Some main parameters of the optical lens 10 in some embodiments of the present application are as follows:

[0497] Table 6.1 Values of the first focal power distribution ratio of the optical lens 10 in some embodiments of the present application

[0498] Table 6.2 Values of the second focal power distribution ratio of the optical lens 10 in some embodiments of the present application

[0499] Table 6.3 Values of the focus stroke compression ratio of the optical lens 10 in some embodiments of the present application

[0500] Table 6.4 Values of the third focal power distribution ratio of the optical lens 10 in some embodiments of the present application

[0501] Table 6.5 Values of the moving distance of the first lens group G1 and the second lens group G2 of the optical lens 10 in some embodiments of the present application during switching between the short-focus state and the long-focus state; the unit is mm

[0502] Table 6.6 Values of the coefficient m, the relationship |mf g1 |, the coefficient n, and the relationship |-nf g2 | of the optical lens 10 in some embodiments of the present application; the units of the relationship |mf g1 | and the relationship |-nf g2 | are mm

[0503] Table 6.7 Values of the effective focal length, the maximum optical zoom ratio, and the maximum system zoom ratio of the optical lens 10 in some embodiments of the present application; the unit of the effective focal length is mm

[0504] Table 6.8 Relationship of the optical lens 10 in some embodiments of the present application value of the coefficient k (in mm)

[0505] Table 6.9 Closest focusing distance U of the optical lens 10 in some embodiments of the present application 0min value of the coefficient k (in mm)

[0506] The type of cross-section line in the drawings of the present application is to distinguish different components, and should not be understood as a limitation on the material of the components. The drawings of the present application are to show the structural composition, and are not shown in the proportion of the actual product.

[0507] Although the description of the present application will be introduced in combination with some embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the embodiments in combination with the present application is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict.

[0508] In the embodiments of the present application, the terms "first", "second", "third", "fourth", "fifth" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second", "third", "fourth", "fifth" can explicitly or implicitly include one or more of the features.

[0509] In the embodiments of the present application, "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0510] In the description of the embodiments of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connect" should be construed broadly, for example, "connect" can be removable connection, or can be non-removable connection; can be direct connection, or can be indirect connection through intermediate medium. The orientation language mentioned in the embodiments of the present application, such as "upper", "lower", "left", "right", "inner", "outer" and the like, is only the direction of the reference drawing, therefore, the orientation language used is for better, more clearly illustrating and understanding the embodiments of the present application, and is not indicative or implied that the device or element referred to must have a particular orientation, constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the embodiments of the present application. "Multiple" means at least two.

[0511] In this specification, the phrase "one embodiment" or "some embodiments" etc. means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrase "in one embodiment", "in some embodiments", "in other embodiments", "in additional embodiments" etc. in various places in the specification are not necessarily all referring to the same embodiment, but can refer to one or more but not all embodiments, unless otherwise specifically noted. The terms "including", "containing", "having" and their variants mean "including but not limited to", unless otherwise specifically noted.

[0512] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical lens, characterized in that: The lens comprises a front lens group (G0), a first lens group (G1), and a second lens group (G2) arranged in a direction from the object side to the image side; The optical lens has a lens optical axis (5), the first lens group (G1) and the second lens group (G2) are arranged along the lens optical axis (5), and the first lens group (G1) and the second lens group (G2) can respectively move different distances along the lens optical axis (5) to switch the optical lens between a short-focus state and a long-focus state; When the optical lens is in the short-focus state or the long-focus state, the front lens group (G0) and the second lens group (G2) remain relatively fixed in the direction along the lens optical axis (5), and the first lens group (G1) can move along the lens optical axis (5) to enable the optical lens to switch between focusing on a near-view and focusing on a far-view; First optical power distribution ratio β=f g01 / f g0 , the second focal power distribution ratio α=F / f g01 , where f g0 is the effective focal length of the front lens group (G0), f g01 is the combined focal length of the front lens group (G0) and the first lens group (G1), and F is the effective focal length of the optical lens; β satisfies: 0.23≤|β|<1; and / or, α satisfies: |α|≤2.

2. The optical lens according to claim 1, wherein: β satisfies: 0.23≤|β|≤0.

45.

3. The optical lens according to claim 1 or 2, characterized in that: When the optical lens focuses on a telephoto view, when the optical lens is in the short-focus state and the effective focal length of the optical lens is the minimum value in the short-focus state, β satisfies: 0.23≤|β|≤0.39; And / or, when the optical lens focuses on a telephoto view, when the optical lens is in the telephoto state and the effective focal length of the optical lens is the maximum value of the telephoto state, β satisfies: 0.27≤|β|≤0.

45.

4. The optical lens according to any one of claims 1 to 3, wherein: α satisfies: 1.1≤|α|≤2.

5. The optical lens according to any one of claims 1 to 4, wherein: When the optical lens focuses on a telephoto view, when the optical lens is in the short-focus state and the effective focal length of the optical lens is the minimum value in the short-focus state, α satisfies: 1.1≤|α|≤1.67; And / or, when the optical lens focuses on a telephoto view, when the optical lens is in the telephoto state and the effective focal length of the optical lens is the maximum value of the telephoto state, α satisfies: 1.86≤|α|≤1.

94.

6. The optical lens according to any one of claims 1 to 5, wherein: Focus stroke compression ratio ξ=(1-β 2 )α 2 ;ξ satisfies:ξ≤3.

5.

7. The optical lens according to claim 6, wherein: When the optical lens focuses on a telephoto view, when the optical lens is in the short-focus state and the effective focal length of the optical lens is the minimum value of the short-focus state, ξ satisfies: 1.1≤ξ≤2.4; And / or, when the optical lens focuses on a telephoto view, when the optical lens is in the telephoto state and the effective focal length of the optical lens is the maximum value of the telephoto state, ξ satisfies: 3.0≤ξ≤3.

5.

8. The optical lens according to any one of claims 1 to 7, wherein: The third power distribution ratio γ=F / f g0 ;γ satisfies: Where, ξ=(1-β 2 )a 2 。 9. The optical lens according to claim 8, wherein: When the optical lens focuses on a telephoto view, when the optical lens is in the short-focus state and the effective focal length of the optical lens is the minimum value in the short-focus state, γ satisfies: 0.27≤|γ|≤0.65; And / or, when the optical lens focuses on a telephoto view, when the optical lens is in the telephoto state and the effective focal length of the optical lens is the maximum value of the telephoto state, γ satisfies: 0.55≤|γ|≤0.

85.

10. The optical lens according to any one of claims 1 to 9, wherein: The minimum focusing distance U of the optical lens 0min 'Satisfaction: U 0min ′≥75mm.

11. The optical lens according to any one of claims 1 to 10, wherein: When the optical lens is in the short-focus state, the effective focal length f of the front lens group (G0) is g0 , the effective focal length f of the first lens group (G1) g1 satisfy: Among them, the coefficient 12. The optical lens according to any one of claims 1 to 11, wherein: During the switching process of the optical lens between the short-focus state and the long-focus state, the moving distance q of the first lens group (G1) satisfies: q≤9.7mm.

13. The optical lens according to claim 12, wherein: The moving distance of the first lens group (G1) includes an optical zoom moving distance, which is: when the optical lens focuses on a telephoto view, the moving distance of the first lens group (G1) is during the process of switching the optical lens between the short focus state and the long focus state; the optical zoom moving distance q1 satisfies: q1 = |mf g1 |≤9.1mm; Wherein, the coefficient m is: when the optical lens focuses on a distant view, the difference between the value of 1 / β when the optical lens is in the short focus state and the value of 1 / β when the optical lens is in the long focus state; f g1 is the effective focal length of the first lens group (G1).

14. The optical lens according to any one of claims 1 to 13, wherein: During the switching process of the optical lens between the short-focus state and the long-focus state, the moving distance Δ of the second lens group (G2) satisfies: Δ≤15.8 mm.

15. The optical lens according to claim 14, wherein: The moving distance Δ of the second lens group (G2) satisfies: Δ=|-nf g2 |≤15.8mm; Wherein, the coefficient n is the difference between the value of α when the optical lens is in the telephoto state and the value of α when the optical lens is in the short focal state; f g2 is the effective focal length of the second lens group (G2).

16. The optical lens according to any one of claims 1 to 15, wherein: The maximum optical zoom ratio of the optical lens is max Satisfied: G max =j1 / j2≤2.1; Wherein, the maximum optical zoom ratio Γ max is: when the optical lens focuses on a distant view, the maximum ratio of the effective focal length of the optical lens when in the telephoto state to the effective focal length of the optical lens when in the short focal state; j1 is the value of αβ when the optical lens is in the telephoto state and focuses on a distant view; j2 is the value of αβ when the optical lens is in the short-focus state and focuses on a distant view.

17. The optical lens according to any one of claims 1 to 16, wherein: The maximum system zoom ratio Γ of the optical lens max Satisfaction: Г′ max ≤2.5; Wherein, the maximum system zoom ratio Γ′ max It is the ratio of the maximum effective focal length to the minimum effective focal length of the optical lens.

18. The optical lens according to any one of claims 1 to 17, wherein: The optical power of the front lens group (G0) and the second lens group (G2) is negative, and the optical power of the first lens group (G1) is positive.

19. The optical lens according to claim 18, wherein: The front lens group (G0) includes a positive lens and at least one negative lens along the direction from the object side to the image side; The first lens group (G1) includes a first lens (L11), a second lens (L12), and a third lens (L13) along the direction from the object side to the image side, the first lens (L11) and the third lens (L13) both having positive refractive power, the second lens (L12) having positive refractive power or negative refractive power, and a gap is formed between adjacent two of the first lens (L11), the second lens (L12), and the third lens (L13); The second lens group (G2) includes a fourth lens (L21) and a fifth lens (L22) both having negative optical power along the direction from the object side to the image side, and a gap is formed between the fourth lens (L21) and the fifth lens (L22).

20. The optical lens according to claim 19, wherein: The front lens group (G0) further includes a first turning element (1); the positive lens is arranged on the object side of the first turning element (1), and the at least one negative lens is arranged on the image side of the first turning element (1); or, the positive lens and the at least one negative lens are both arranged on the image side of the first turning element (1).

21. A camera module, characterized in that: The optical lens (10) comprises a photosensitive element (20) and any one of claims 1 to 20, wherein the photosensitive element (20) is arranged on the image side of the optical lens (10).

22. An electronic device, characterized in that: It comprises a housing and the camera module (100) described in claim 21, wherein the camera module (100) is mounted on the housing (200).

Images