Optical camera, 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 that a focusing lens group is prone to collision during focusing when an optical lens is in a telephoto state. The optical lens comprises a front lens group, a first lens group, and a second lens group which are arranged along a direction from an object side to an image side; the optical power of the front lens group and the second lens group is negative, and the optical power of the first lens group is positive; when the optical lens is in a short-focus state, the front lens group and the second lens group remain relatively fixed along the optical axis of the lens, and the first lens group can move along the optical axis of the lens, so that the optical lens is switched between near focus and far focus; when the optical lens is in a telephoto state, the front lens group and the first lens group remain relatively fixed along the optical axis of the lens, and the second lens group can move along the optical axis of the lens, so that the optical lens is switched between near focus and far focus. The present application can be applied to electronic devices such as mobile phones.

Description

Optical lenses, camera modules and electronic devices

[0001] This application claims priority to Chinese patent application filed on November 21, 2024, with application number 202411680709.0 and entitled "Optical Lens, Camera Module and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical lens technology, and in particular to an optical lens, a camera module, and an electronic device. Background Technology

[0003] Currently, optical lenses have become an important component of electronic devices. Through optical lenses, desired photos can be easily captured to meet people's photography needs. Initially, the optical lenses of electronic devices were all fixed-focus, meaning that the focal length of the optical lens remained constant. These optical lenses were called fixed-focus lenses. As people's requirements for the image quality of electronic devices increased, fixed-focus lenses could no longer meet the requirements for shooting. Therefore, optical lenses with adjustable focal lengths (i.e., zoom lenses) came into being.

[0004] A zoom lens is an optical lens that can change its focal length without changing the shooting position, allowing users to magnify or reduce the size of the object being photographed by adjusting the focal length. The working principle of a 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 can be adjusted, thereby achieving the effect of magnifying or reducing the size of the object being photographed. Zoom lenses are widely used in electronic devices such as mobile phones, tablets, and wearable devices, and how to design zoom lenses has become one of the important topics in the industry. Summary of the Invention

[0005] Embodiments of this application provide an optical lens, a camera module, and an electronic device to solve the problem in related technologies where the focusing lens group is prone to collision during focusing when the optical lens is in a telephoto state.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, embodiments of this application provide an optical lens, including a front lens group G0, a first lens group G1, and a second lens group G2 arranged along the object-to-image direction; 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; 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, and the first lens group G1 and the second lens group G2 can be moved along the lens optical axis respectively, so that the optical lens can switch between a short focal length state and a long focal length state; the optical lens has a first focal length when in the long focal length state, and a second focal length when in the short focal length state, the first focal length... The maximum value of the first focal length is greater than the maximum value of the second focal length; the minimum value of the first focal length can be greater than or less than the maximum value of the second focal length; when the optical lens is in short focal length mode, the front lens group G0 and the second lens group G2 remain relatively fixed along the optical axis of the lens, and the first lens group G1 can move along the optical axis of the lens to allow the optical lens to switch between focusing on close-up and focusing on distant objects; when the optical lens is in long focal length mode, the front lens group G0 and the first lens group G1 remain relatively fixed along the optical axis of the lens, and the second lens group G2 can move along the optical axis of the lens to allow the optical lens to switch between focusing on close-up and focusing on distant objects.

[0008] In this context, focusing on a close-up scene with an optical lens means that the lens can clearly image the subject at a first object distance. Focusing on a distant scene with an optical lens means that the lens can clearly image the subject at a second object distance, which is greater than the first object distance. In telephoto mode, the first object distance is the maximum object distance at which the lens can achieve a clear image, such as infinity, and the second object distance is the minimum object distance at which it can achieve a clear image, such as 20mm. In short-focal-length mode, the first object distance is the maximum object distance at which the lens can achieve a clear image, such as infinity, and the second object distance is the minimum object distance at which it can achieve a clear image, such as 75mm.

[0009] The optical lens provided in this application embodiment uses the second lens group G2 as the focusing lens group for internal focusing when the optical lens is in telephoto mode. In this way, during the process of switching the optical lens from focusing on the distant scene to focusing on the near scene in telephoto mode, the second lens group G2 moves towards the image side. Since the image side of the second lens group G2 has a larger movement gap when the optical lens is in telephoto mode (this is because during the process of switching from short focal length mode to telephoto mode, both the first lens group G1 and the second lens group G2 move towards the front lens group G0, increasing the gap on the side of the second lens group G2 away from the front lens group G0 (image side)), the second lens group G2 has sufficient movement space, thereby reducing the risk of collision between the second lens group G2 (i.e., the focusing lens group) and its image side optical elements, which is beneficial for the optical lens to achieve near scene imaging.

[0010] In some embodiments of the first aspect, when the optical lens is in telephoto mode and focusing on a distant object, the BFL (Browser Fluid) satisfies: BFL ≥ 9.6mm. This configuration allows sufficient space for the second lens group G2 to move when the optical lens is focusing on a distant object, significantly reducing the risk of collision between the second lens group G2 and its image-side optical elements during internal focusing.

[0011] In some embodiments of the first aspect, when the optical lens is in telephoto mode and focusing on a distant scene, the BFL (Browser Flexibility) satisfies: BFL ≤ 17.0mm. This setting avoids making the camera module too large when the optical lens is focusing on a distant scene.

[0012] In some embodiments of the first aspect, when the optical lens is in telephoto mode and focusing on a close-up, the BFL satisfies: BFL ≥ 2.2mm. This configuration provides sufficient safety space on the image side of the second lens group G2 when the optical lens is focusing on a close-up, preventing the second lens group G2 from colliding with its image-side optical elements under external forces (such as the inertial force generated when an electronic device is dropped).

[0013] In some embodiments of the first aspect, when the optical lens is in telephoto mode and focusing on a close-up, the BFL (Browser Flexibility) satisfies: BFL ≤ 15.6mm. This setting avoids an excessively large camera module size when the optical lens is focusing on a distant scene.

[0014] In some embodiments of the first aspect, when the optical lens is in the telephoto state and focusing on a distant object, the gap width δ between the second lens group G2 and the first lens group G1 satisfies: δ ≥ 0.7 mm. With this configuration, during the process of the optical lens switching from focusing on a distant object to focusing on a close-up object, there can be sufficient safety space between the second lens group G2 and the first lens group G1, thereby significantly reducing the risk of collision between the second lens group G2 and the first lens group G1.

[0015] In some embodiments of the first aspect, when the optical lens is in the telephoto state and focusing on a distant scene, the gap width δ satisfies: δ≤1.2mm. This configuration avoids the overall space occupied by the lens group of the optical lens being too large when the optical lens is focusing on a distant scene.

[0016] In some embodiments of the first aspect, when the optical lens is in the telephoto state and focusing on a close-up, δ satisfies: δ≥2.1mm. This configuration allows for sufficient safety space between the second lens group G2 and the first lens group G1 when the optical lens is focusing on a close-up, preventing collisions between the second lens group G2 and the first lens group G1 under external forces (such as the inertial force generated when an electronic device is dropped).

[0017] In some embodiments of the first aspect, when the optical lens is in the telephoto state and focusing on a close-up object, δ satisfies: δ≤16mm. This configuration avoids the overall space occupied by the lens group of the optical lens being too large when focusing on a close-up object.

[0018] In some embodiments of the first aspect, during the process of the optical lens switching from a short focal length state to a long focal length state, the maximum value of the movement distance of the second lens group G2 towards or away from the front lens group G0 is less than or equal to 15.5 mm. This setting helps to reduce the size of the drive motor of the second lens group G2, thereby facilitating the miniaturization of the camera module.

[0019] In some embodiments of the first aspect, the first focusing movement distance Δ1 of the second lens group G2 satisfies: Δ1 ≤ 14.8 mm; wherein, the first focusing movement distance Δ1 is: the movement distance of the second lens group G2 during the process of the optical lens switching from focusing on a distant scene to focusing on a close scene when the optical lens is in a telephoto state. This setting can significantly reduce the risk of collision between the second lens group G2 and its image-side optical elements.

[0020] In some embodiments of the first aspect, the first focusing movement distance Δ1 of the second lens group G2 satisfies: Δ1 ≥ 1.1 mm. This setting reduces the required driving accuracy of the drive motor of the second lens group G2.

[0021] In some embodiments of the first aspect, the first optical zoom movement distance Δ2 of the second lens group G2 satisfies: Δ2=|-nf g2 |≤15.5mm; where, the first optical zoom movement distance Δ2 is: the movement distance of the second lens group G2 during the process of switching the optical lens from short focal length to long focal length when the optical lens is focusing on a distant scene; the coefficient n is the difference between the value of α when the optical lens is in long focal length and the value of α when it is in short focal length; α=F / f g01 F is the effective focal length of the optical lens, f g01 f is the combined focal length of the front lens group G0 and the first lens group G1; g2 This is the effective focal length of the second lens group G2. With this setup, by appropriately setting f... g2 The size of α can control the first optical zoom movement distance Δ2 of the second lens group G2, thereby controlling the volume of the drive motor of the second lens group G2, and thus the volume of the camera module.

[0022] In some embodiments of the first aspect, during the process of the optical lens switching from a short focal length state to a long focal length state, the maximum value of the distance by which the first lens group G1 moves towards or away from the front lens group G0 is less than or equal to 9.0 mm. This setting helps to reduce the size of the drive motor of the first lens group G1, thereby facilitating the miniaturization of the camera module.

[0023] In some embodiments of the first aspect, the second focusing movement distance q1 of the first lens group G1 satisfies: q1 ≤ 6.0 mm; wherein, the second focusing movement distance q1 is: the movement distance of the first lens group G1 during the process of switching the optical lens from focusing on a distant object to focusing on a close object when the optical lens is in a short focal length state. This setting can greatly reduce the risk of the first lens group G1 colliding with its object-side optical elements.

[0024] In some embodiments of the first aspect, the second focusing movement distance q1 of the first lens group G1 satisfies: q1 ≥ 2.9 mm. This setting reduces the required driving accuracy of the drive motor of the first lens group G1.

[0025] In some embodiments of the first aspect, the second optical zoom movement distance q2 of the first lens group G1 satisfies: q2=|mf g1 |≤9.0mm; where, the first optical zoom movement distance q2 is: the movement distance of the first lens group G1 during the process of switching the optical lens from short focal length to long focal length when the optical lens is focusing on a distant scene; the coefficient m is: the difference between the value of 1 / β when the optical lens is in short focal length and the value of 1 / β when the optical lens is in long focal length when focusing on a distant scene; β=f g01 / f g0 f g01 f is the combined focal length of the front lens group G0 and the first lens group G1. g0 f is the effective focal length of the front lens group G0; g1 This is the effective focal length of the first lens group G1. With this setup, by appropriately setting f... g1 The size of β can control the second optical zoom moving distance q2 of the first lens group G1, thereby controlling the volume of the drive motor of the first lens group G1, and thus the volume of the camera module.

[0026] In some embodiments of the first aspect, when the optical lens is in a telephoto state, the minimum value of the focus stroke compression ratio ξmin, the first optical power distribution ratio α, the effective focal length F of the optical lens, and the combined focal length f of the front lens group G0 and the first lens group G1 are... g01 Satisfy: ξmin=|1-α 2 |≤2.8; where α=F / f g01This configuration avoids excessively short focusing travel of the focusing lens group (i.e., the second lens group G2) when the optical lens switches between focusing on close-up and focusing on distant objects, which helps to reduce the precision requirements of the driving motor of the focusing lens group.

[0027] In some embodiments of the first aspect, when the optical lens is focused on a distant scene, and the optical lens is in a telephoto state and the effective focal length F of the optical lens is the maximum value of the first focal length, the minimum value of the focusing stroke compression ratio ξmin satisfies: 2.3 ≤ ξmin ≤ 2.8. This setting reduces the focusing stroke of the focusing lens group (i.e., the second lens group G2), which is beneficial for reducing the size of the drive motor of the focusing lens group; it also avoids the focusing stroke of the focusing lens group being too short, thus reducing the accuracy requirements of the drive motor of the second lens group G2.

[0028] In some embodiments of the first aspect, when the optical lens is in a short focal length state, the focusing stroke compression ratio ξ, the first optical power allocation ratio α, the second optical power allocation ratio β, the effective focal length F of the optical lens, and the effective focal length f of the front lens group G0 are... g0 The combined focal length f of the front lens group G0 and the first lens group G1 g01 Satisfy: ξ=(1-β) 2 )α 2 ≤2.4; where α=F / f g01 , β=f g01 / f g0 This configuration avoids excessively short focusing travel of the focusing lens group (i.e., the first lens group G1) when the optical lens switches between focusing on close-up and focusing on distant objects, which helps to reduce the precision requirements of the drive motor of the focusing lens group.

[0029] In some embodiments of the first aspect, when the optical lens is focused on a distant scene, and the optical lens is in a short focal length state, and the effective focal length f of the optical lens is the minimum value of the second focal length, the focusing stroke compression ratio ξ satisfies: 1.1 ≤ ξ ≤ 2.4. This setting reduces the focusing stroke of the focusing lens group (i.e., the first lens group G1), which is beneficial for reducing the size of the drive motor of the focusing lens group; it also avoids the focusing stroke of the focusing lens group being too short, thus reducing the accuracy requirements of the drive motor of the focusing lens group.

[0030] In some embodiments of the first aspect, when the optical lens is focused on a distant scene, and the optical lens is in a short focal length state and the effective focal length of the optical lens is the minimum value of the second focal length, the third optical power allocation ratio γ, the first optical power allocation ratio α, the second optical power allocation ratio β, and the focus stroke compression ratio ξ satisfy:

[0031] Where γ=F / f g0This design minimizes MTF loss in the optical lens, thus improving its image quality. Simultaneously, it avoids excessively long optical lenses, thereby reducing their overall size and weight.

[0032] In some embodiments of the first aspect, the third optical power allocation ratio γ, the effective focal length F of the optical lens, and the effective focal length f of the front lens group G0 are... g0 Satisfies: |γ|≤0.86; where γ=F / f g0 This configuration minimizes MTF loss in the optical lens and also helps reduce the size of the optical lens when in a short focal length configuration.

[0033] In some embodiments of the first aspect, when the optical lens is focused on a distant scene, and the optical lens is in telephoto mode and the effective focal length of the optical lens is the maximum value of the first focal length, γ satisfies: 0.55≤|γ|≤0.86. This setting can reduce the MTF loss of the optical lens; at the same time, it is beneficial to reduce the size of the optical lens when it is in telephoto mode.

[0034] In some embodiments of the first aspect, the first optical power allocation ratio α, the effective focal length F of the optical lens, and the combined focal length f of the front lens group G0 and the first lens group G1 are... g01 Satisfies: 1.1 < |α| ≤ 2; where α = F / f g01 This configuration reduces the focusing stroke of the focusing lens group, which helps to reduce the size of the drive motor; it also avoids the focusing stroke of the focusing lens group being too short, thus reducing the precision requirements of the drive motor.

[0035] In some embodiments of the first aspect, when the optical lens is focused on a distant scene, and the optical lens is in a short focal length state, and the effective focal length of the optical lens is the minimum value of the second focal length, α satisfies: 1.1 ≤ |α| ≤ 1.67. This setting reduces the focusing travel of the focusing lens group (i.e., the first lens group G1), which is beneficial for reducing the size of the drive motor of the focusing lens group; it also avoids the focusing travel of the focusing lens group being too short, thus reducing the accuracy requirements of the drive motor of the focusing lens group.

[0036] In some embodiments of the first aspect, when the optical lens is focused on a distant scene, and the optical lens is in telephoto mode and the effective focal length of the optical lens is the maximum value of the first focal length, α satisfies: 1.83 ≤ |α| ≤ 1.94. This setting reduces the focusing stroke of the first focusing lens group (i.e., the second lens group G2), which is beneficial for reducing the size of the drive motor of the focusing lens group; it also avoids the focusing stroke of the focusing lens group being too short, thus reducing the accuracy requirements of the drive motor of the focusing lens group.

[0037] In some embodiments of the first aspect, the second optical power allocation ratio β and the effective focal length f of the front lens group G0 are... g0 The combined focal length f of the front lens group G0 and the first lens group G1 g01 Satisfies: 0.24 ≤ |β| < 1; where β = f g01 / f g0 This configuration avoids excessively short focusing stroke of the focusing lens group (i.e., the first lens group G1), thus reducing the precision requirements on the drive motor of the focusing lens group.

[0038] In some embodiments of the first aspect, when the optical lens is focused on a distant scene, and the optical lens is in a short focal length state and the effective focal length F of the optical lens is the minimum value of the second focal length, β satisfies: 0.24≤|β|≤0.39. This can reduce the focusing stroke of the first lens group G1, which is beneficial to reducing the size of the drive motor of the focusing lens group (i.e., the first lens group G1).

[0039] In some embodiments of the first aspect, when the optical lens is in a telephoto state, the minimum focusing distance U of the optical lens is... 01min ′ Satisfy: U 01min ≥68mm. This setting avoids the optical lens's closest focusing distance U when in telephoto mode. 01min The smaller the angle, the easier it is to design the optical lens.

[0040] In some embodiments of the first aspect, when the optical lens is in a telephoto state, the minimum focusing distance U of the optical lens is... 01min ′ Satisfy: U 01min ≤465mm. With this setting, the optical lens can capture details of objects at closer distances, thereby improving the image quality at closer distances.

[0041] In some embodiments of the first aspect, when the optical lens is in a telephoto state, the first optical power allocation ratio α, the effective focal length F of the optical lens, and the combined focal length f of the front lens group G0 and the first lens group G1 are... g01 The effective focal length f of the second lens group G2 g2 satisfy:

[0042] Among them, coefficient α=F / f g01 With this setup, the optical lens can capture details of objects at closer distances, thereby improving the image quality at closer distances.

[0043] In some embodiments of the first aspect, the maximum optical zoom ratio Γ of the optical lens max Satisfy: Г max=j1 / j2≤2.1; where, the maximum optical zoom ratio Г max Let αβ be the maximum ratio of the effective focal length of the optical lens when it is in telephoto mode to the maximum effective focal length when it is in telephoto mode, and j2 be the value of αβ when the optical lens is in telephoto mode and focusing on a distant object. This setting avoids making the overall length of the optical lens too long, thus helping to reduce its size.

[0044] In some embodiments of the first aspect, the maximum system zoom ratio Γ′ of the optical lens max Satisfy: Г′ max ≤2.6; where the maximum system zoom ratio Г′ max This is the ratio of the maximum effective focal length to the minimum effective focal length of the optical lens. This setting helps prevent the overall length of the optical lens from becoming too long, thus allowing for a reduction in its size.

[0045] In some embodiments of the first aspect, the front lens group G0 includes a positive lens L01 and at least one negative lens along the object-to-image direction; the first lens group G1 includes a first lens L11, a second lens L12, and a third lens L13 along the object-to-image direction, wherein the first lens L11 and the third lens L13 have positive optical power, and the second lens L12 has either positive or negative optical power, and there is a gap between adjacent lenses 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 object-to-image direction, and there is a gap between the fourth lens L21 and the fifth lens L22. This arrangement can further correct aberrations in the optical lens.

[0046] In some embodiments of the first aspect, the front lens group G0 further includes a first folding element; a positive lens L01 is disposed on the object side of the first folding element, and the at least one negative lens is disposed on the image side of the first folding element. This arrangement allows the positive lens L01 and the at least one negative lens to fully utilize the space on both the object and image sides of the first folding element, thereby making the front lens group G0 more compact.

[0047] In some embodiments of the first aspect, both the positive lens L01 and the at least one negative lens are disposed on the image side of the first pivoting element. This arrangement simplifies the structure of the optical lens and reduces its cost.

[0048] In some embodiments of the first aspect, the first turning element is a prism, including a first prism incident surface and a first prism exit surface, the first prism incident surface being disposed toward the object side of the optical lens, and the first prism exit surface being disposed toward the side where the first lens group G1 is located.

[0049] In some embodiments of the first aspect, the first turning element is a reflector.

[0050] In some embodiments of the first aspect, the second lens L12 includes a positive lens L121 and a negative lens L122 disposed at intervals. This arrangement is beneficial for correcting aberrations in the optical lens.

[0051] In some embodiments of the first aspect, the second lens L12 comprises two negative lenses spaced apart. This arrangement is advantageous for correcting aberrations in the optical lens.

[0052] In some embodiments of the first aspect, the fifth lens L22 includes a positive lens and a negative lens spaced apart. This arrangement is beneficial for correcting aberrations in the optical lens.

[0053] In some embodiments of the first aspect, the optical lens further includes a second deflection element for reflecting the outgoing light beam of the second lens group G2 to the photosensitive element.

[0054] In some embodiments of the first aspect, the second turning element is a prism, including a second prism incident surface and a second prism exit surface. The second prism incident surface is disposed on the side where the second lens group G2 is located, and the second prism exit surface is disposed on the side where the image plane of the optical lens is located.

[0055] In some embodiments of the first aspect, the second turning element is a reflector.

[0056] Secondly, embodiments of this application provide a camera module, including a photosensitive element and an optical lens as described in the first aspect, wherein the photosensitive element is disposed on the image side of the optical lens.

[0057] The beneficial effects of the camera module in this embodiment are the same as those of the optical lens in the first aspect, and will not be repeated here.

[0058] Thirdly, embodiments of this application provide an electronic device, including a housing and the camera module mentioned in the second aspect, wherein the camera module is mounted on the housing.

[0059] The beneficial effects of the electronic device in this embodiment are the same as those of the optical lens in the first aspect, and will not be repeated here.

[0060] In some embodiments of the third aspect, the electronic device is a mobile phone or a tablet computer. Attached Figure Description

[0061] Figure 1a is a schematic diagram of the definition of the image-side principal plane and the image-side principal point of the optical system;

[0062] Figure 1b is a schematic diagram of the definition of the object-side principal plane and object-side principal point of the optical system;

[0063] Figure 1c is a schematic diagram of the definitions of object distance and image distance in an optical system;

[0064] Figure 2a is a schematic diagram of an optical lens in the related technology;

[0065] Figure 2b is a schematic diagram of the zoom and focus principle of the optical lens shown in Figure 2a;

[0066] Figure 3 is a schematic diagram of the back of an electronic device (mobile phone) in some embodiments of this application;

[0067] Figure 4 is a cross-sectional view (AA) of the electronic device in Figure 3;

[0068] Figure 5 is a schematic diagram of the optical lens in the first embodiment of this application in the short focal length state;

[0069] Figure 6 is a schematic diagram of the optical lens in the first embodiment of this application in the telephoto state;

[0070] Figure 7a is an optical schematic diagram of the optical lens switching between short focal length and long focal length in the first embodiment of this application.

[0071] Figure 7b is a second optical principle diagram of the optical lens switching between short focal length and long focal length in the first embodiment of this application;

[0072] Figure 8 is a structural schematic diagram of the optical lens in the short focal length state in the second embodiment of this application;

[0073] Figure 9 is a schematic diagram of the optical lens in the telephoto state in the second embodiment of this application;

[0074] Figure 10 is a schematic diagram of the optical lens in the short focal length state in the third embodiment of this application;

[0075] Figure 11 is a schematic diagram of the optical lens in the short focal length state in the fourth embodiment of this application;

[0076] Figure 12a is a schematic diagram of the optical lens in the fifth embodiment of this application when it is in a short focal length state and focusing on a distant scene.

[0077] Figure 12b is a schematic diagram of the optical lens in the fifth embodiment of this application when it is in a short focal length state and focusing on a close-up scene.

[0078] Figure 12c is a schematic diagram of the optical lens in the fifth embodiment of this application in a telephoto state and focusing on a distant scene.

[0079] Figure 12d is a schematic diagram of the optical lens in the fifth embodiment of this application when it is in telephoto mode and focusing on a close-up scene.

[0080] Figure 12e shows the axial spherical aberration curve of the optical lens in the fifth embodiment of this application when it is in a short focal length state;

[0081] Figure 12f shows the field curvature and distortion curves of the optical lens in the fifth embodiment of this application when it is in a short focal length state;

[0082] Figure 12g shows the axial spherical aberration curve of the optical lens in the fifth embodiment of this application when it is in a telephoto state;

[0083] Figure 12h shows the field curvature and distortion curves of the optical lens in the fifth embodiment of this application when it is in telephoto mode;

[0084] Figure 12i is a graph showing the relationship between the effective focal length of the optical lens and the focusing stroke compression ratio when the first lens group G1 is used for internal focusing in the fifth embodiment of this application.

[0085] Figure 12j is a graph showing the relationship between the first optical zoom movement distance Δ2, the second optical zoom movement distance q2 and the effective focal length of the optical lens during the zooming process in the fifth embodiment of this application.

[0086] Figure 12k is a graph showing the relationship between the effective focal length of the optical lens and the first optical power allocation ratio, the second optical power allocation ratio, and the third optical power allocation ratio during the zooming process in the fifth embodiment of this application.

[0087] Figure 121 is a graph showing the relationship between the second focusing distance q1 and the effective focal length of the optical lens during the internal focusing process of the first lens group G1 in the fifth embodiment of this application.

[0088] Figure 12m is a graph showing the relationship between the first focusing distance Δ1 and the effective focal length of the optical lens during the internal focusing process of the second lens group G2 in the fifth embodiment of this application.

[0089] Figure 12n is a graph showing the relationship between the focus stroke compression ratio, the minimum value of the focus stroke compression ratio, and the effective focal length of the optical lens during the internal focusing process of the second lens group G2 in the fifth embodiment of this application.

[0090] Figure 13a is a schematic diagram of the optical lens in the sixth embodiment of this application when it is in a short focal length state and focusing on a distant scene.

[0091] Figure 13b is a schematic diagram of the optical lens in the sixth embodiment of this application when it is in a short focal length state and focusing on a close-up scene.

[0092] Figure 13c is a schematic diagram of the optical lens in the sixth embodiment of this application when it is in telephoto mode and focusing on a distant scene.

[0093] Figure 13d is a schematic diagram of the optical lens in the sixth embodiment of this application when it is in telephoto mode and focusing on a close-up scene.

[0094] Figure 13e shows the axial spherical aberration curve of the optical lens in the sixth embodiment of this application when it is in a short focal length state;

[0095] Figure 13f shows the field curvature and distortion curves of the optical lens in the sixth embodiment of this application when it is in a short focal length state.

[0096] Figure 13g shows the axial spherical aberration curve of the optical lens in the sixth embodiment of this application when it is in a telephoto state;

[0097] Figure 13h shows the field curvature and distortion curves of the optical lens in the sixth embodiment of this application when it is in telephoto mode.

[0098] Figure 13i is a graph showing the relationship between the effective focal length of the optical lens and the focusing stroke compression ratio when the first lens group G1 is used for internal focusing in the sixth embodiment of this application.

[0099] Figure 13j is a graph showing the relationship between the first optical zoom distance Δ2, the second optical zoom distance q2 and the effective focal length of the optical lens during the zooming process in the sixth embodiment of this application.

[0100] Figure 13k is a graph showing the relationship between the effective focal length of the optical lens and the first optical power allocation ratio, the second optical power allocation ratio, and the third optical power allocation ratio during the zooming process in the sixth embodiment of this application.

[0101] Figure 131 is a graph showing the relationship between the second focusing distance q1 and the effective focal length of the optical lens during the internal focusing process of the first lens group G1 in the sixth embodiment of this application.

[0102] Figure 13m is a graph showing the relationship between the first focusing distance Δ1 and the effective focal length of the optical lens during the internal focusing process of the second lens group G2 in the sixth embodiment of this application.

[0103] Figure 13n is a graph showing the relationship between the focus stroke compression ratio, the minimum value of the focus stroke compression ratio, and the effective focal length of the optical lens during the internal focusing process of the second lens group G2 in the sixth embodiment of this application.

[0104] Figure 13o shows the focusing process state diagram within the second lens group G2 of the optical lens in the extended scheme of the sixth embodiment of this application;

[0105] Figure 14a is a schematic diagram of the optical lens in the seventh embodiment of this application when it is in a short focal length state and focusing on a distant scene.

[0106] Figure 14b is a schematic diagram of the optical lens in the seventh embodiment of this application when it is in a short focal length state and focusing on a close-up scene.

[0107] Figure 14c is a schematic diagram of the optical lens in the seventh embodiment of this application when it is in telephoto mode and focusing on a distant scene.

[0108] Figure 14d is a schematic diagram of the optical lens in the seventh embodiment of this application when it is in a telephoto state and focusing on a close-up scene.

[0109] Figure 14e shows the axial spherical aberration curve of the optical lens in the seventh embodiment of this application when it is in a short focal length state;

[0110] Figure 14f shows the field curvature and distortion curves of the optical lens in the seventh embodiment of this application when it is in a short focal length state.

[0111] Figure 14g shows the axial spherical aberration curve of the optical lens in the seventh embodiment of this application when it is in a telephoto state;

[0112] Figure 14h shows the field curvature and distortion curves of the optical lens in the seventh embodiment of this application when it is in telephoto mode.

[0113] Figure 14i is a graph showing the relationship between the effective focal length of the optical lens and the focusing stroke compression ratio when the first lens group G1 is used for internal focusing in the seventh embodiment of this application.

[0114] Figure 14j is a graph showing the relationship between the first optical zoom movement distance Δ2, the second optical zoom movement distance q2 and the effective focal length of the optical lens during the zooming process in the seventh embodiment of this application.

[0115] Figure 14k is a graph showing the relationship between the effective focal length of the optical lens and the first optical power allocation ratio, the second optical power allocation ratio, and the third optical power allocation ratio during the zooming process in the seventh embodiment of this application.

[0116] Figure 141 is a graph showing the relationship between the second focusing distance q1 and the effective focal length of the optical lens during the internal focusing process of the first lens group G1 in the seventh embodiment of this application.

[0117] Figure 14m is a graph showing the relationship between the first focusing distance Δ1 and the effective focal length of the optical lens during the internal focusing process of the second lens group G2 in the seventh embodiment of this application.

[0118] Figure 15a is a schematic diagram of the optical lens in the eighth embodiment of this application when it is in a short focal length state and focusing on a distant scene.

[0119] Figure 15b is a schematic diagram of the optical lens in the eighth embodiment of this application in a short focal length state and focusing on a close-up scene.

[0120] Figure 15c is a schematic diagram of the optical lens in the eighth embodiment of this application in a telephoto state and focusing on a distant scene.

[0121] Figure 15d is a schematic diagram of the optical lens in the eighth embodiment of this application in a telephoto state and focusing on a close-up scene.

[0122] Figure 15e shows the axial spherical aberration curve of the optical lens in the eighth embodiment of this application when it is in a short focal length state;

[0123] Figure 15f shows the field curvature and distortion curves of the optical lens in the eighth embodiment of this application when it is in a short focal length state.

[0124] Figure 15g shows the axial spherical aberration curve of the optical lens in the eighth embodiment of this application when it is in a telephoto state;

[0125] Figure 15h shows the field curvature and distortion curves of the optical lens in the eighth embodiment of this application when it is in a telephoto state.

[0126] Figure 15i is a graph showing the relationship between the effective focal length of the optical lens and the focusing stroke compression ratio when the first lens group G1 is used for internal focusing in the eighth embodiment of this application.

[0127] Figure 15j is a graph showing the relationship between the first optical zoom movement distance Δ2, the second optical zoom movement distance q2 and the effective focal length of the optical lens during the zooming process in the eighth embodiment of this application.

[0128] Figure 15k is a graph showing the relationship between the effective focal length of the optical lens and the first optical power allocation ratio, the second optical power allocation ratio, and the third optical power allocation ratio during the zooming process in the eighth embodiment of this application.

[0129] Figure 151 is a graph showing the relationship between the second focusing distance q1 and the effective focal length of the optical lens during the internal focusing process of the first lens group G1 in the eighth embodiment of this application.

[0130] Figure 15m is a graph showing the relationship between the first focusing distance Δ1 and the effective focal length of the optical lens during the internal focusing process of the second lens group G2 in the eighth embodiment of this application. Detailed Implementation

[0131] The technical terms used in the embodiments of this application are explained and described below.

[0132] Optical power, expressed as the reciprocal of the image-side focal length (approximately assuming the refractive index of air is 1), characterizes the ability of an optical lens to deflect light. Lenses or lens groups with positive optical power have a positive focal length and converge light rays. Lenses or lens groups with negative optical power have a negative focal length and diverge light rays.

[0133] A positive lens, also known as a converging lens or convex lens, has the function of converging light rays. Convex lenses are classified into biconvex, plano-convex, and concave-convex (or positive meniscus) types.

[0134] A negative lens, also known as a diverging lens or concave lens, has the effect of diverging light. Concave lenses are classified into biconcave, plano-concave, and convex-concave types.

[0135] The optical axis refers to the axis of symmetry of an optical system. For example, the optical axis of an optical lens is the axis that passes through the center of each optical element of the optical lens. The optical axis also refers to the center line of a light beam (light column). The optical properties of the light beam do not change when it rotates around this axis.

[0136] Focal length is a measure of the convergence or divergence of light in an optical system. Focal length is divided into image-side focal length and object-side focal length. Image-side focal length is the distance from the image-side principal plane to the image-side focal point; similarly, object-side focal length is the distance from the object-side principal plane to the object-side focal point. In the embodiments of this application, the focal length, effective focal length (EFL), and combined focal length all refer to image-side focal length.

[0137] 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 shines on the lens (lens group), after refraction, the light rays pass through the focal point on the image side. After refraction, the light rays are extended backward and intersect the incident light rays at a point. The plane perpendicular to the optical axis through this point is the image-side principal plane. The point where the image-side principal plane intersects the optical axis of the lens is the image-side principal point. Similarly, light rays emitted from the object-side focal point become parallel after refraction by the lens. The extended incident light rays intersect the parallel light rays at a point. The plane perpendicular to the optical axis through this point is the object-side principal plane. The point where the object-side principal plane intersects the optical axis of the lens is the object-side principal point.

[0138] As shown in Figure 1a, AB is an incident ray parallel to the optical axis. After passing through an optical system (which can be a single lens or a lens group formed by multiple lenses, etc.), the outgoing ray E'F' intersects 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 infinity axis, called the image-side focal point. If the incident ray AB and the outgoing ray E'F' are extended in opposite directions, the two rays must intersect at a point, let this point be Q'. A plane perpendicular to the optical axis is drawn through Q', intersecting the optical axis at point H'. Then H' is called the image-side principal point, the Q'H' plane is called the image-side principal plane, and the distance from the principal point H' to the focal point F' is called the image-side focal length.

[0139] As shown in Figure 1b, F is called the object-side focal point. Let the extension of the incident ray emitted from the focal point F intersect the extension of the corresponding outgoing ray parallel to the optical axis at point Q. Draw a plane perpendicular to the optical axis through point Q and intersect the optical axis at point H. Point H is called the object-side principal point of the optical system, and 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.

[0140] Object distance, as shown in Figure 1c, refers to the distance from the object plane to the object principal plane of the optical system, and is represented by the English letter U. The optical system can be a single lens or a lens group formed by multiple lenses.

[0141] Image distance, as shown in Figure 1c, refers to the distance from the image plane to the principal plane of the image side of an optical system, and is represented by the English letter V. The optical system can be a single lens or a lens group formed by multiple lenses.

[0142] Working distance refers to the distance from the front surface of the optical system (such as the lens group) (i.e. the surface closest to the object) to the scene being photographed (or the target plane).

[0143] Focusing specifically refers to adjusting the position of the lens group (i.e., the 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, thereby making the image of the optical lens as clear as possible.

[0144] Internal focusing (IF) refers to the process where an optical lens moves an internal focusing lens group to achieve focusing, while the total length (TTL) of the optical lens remains constant during focusing.

[0145] Focusing travel refers to the distance the focusing lens group moves during the focusing process of an optical lens. For example, when an optical lens switches from focusing on a distant scene to focusing on a close-up scene, the distance the focusing lens group moves along the optical axis is the focusing travel.

[0146] The image plane is located on the image side of all lenses in an optical lens, where light rays pass through each lens in sequence to form an image.

[0147] MTF (Modulation Transfer Function) is the ratio of contrast on the image plane to contrast on the object plane; that is, MTF represents the transfer of contrast. MTF = M / m; M = (Imax - Imin) / (Imax + Imin); where Imax is the maximum light intensity on the object plane, and Imin is the minimum light intensity on the object plane; m = (imax - imin) / (imax + imin), where imax is the maximum light intensity on the image plane, and imin is the minimum light intensity on the image plane. MTF is a quantitative description of the sharpness of an optical lens, specifically a quantitative description of the sharpness of the image formed by the optical lens (including both resolution and sharpness). MTF values ​​satisfy 0 ≤ MTF ≤ 1.

[0148] An aperture stop is a physical object in an optical system that limits the beam of light. An aperture stop can be the edge of a lens, a frame, or a specially designed perforated screen. The function of an aperture stop can be twofold: to limit the beam of light or to limit the size of the field of view (imaging range). The aperture stop that limits the beam of light the most in an optical system is called the aperture stop, and the aperture stop that limits the field of view (size) the most is called the field stop.

[0149] The pupil is the image of the aperture stop. The conjugate image of the aperture stop through the optical system in front of the aperture stop is called the entrance pupil, or simply the entrance pupil. The diameter of the entrance pupil is the same as the diameter of the entrance pupil.

[0150] Relative aperture is the ratio of entrance pupil diameter D to image-side focal length fˊ, denoted as RA, i.e., RA = D / fˊ.

[0151] The F-number (Fno or F / #) is the reciprocal of the relative aperture, i.e., F = fˊ / D; the smaller the F-number, the larger the aperture and the shallower the depth of field; conversely, the larger the F-number, the smaller the aperture and the greater the depth of field.

[0152] Total track length (TTL) refers to the total length from the surface of the optical lens closest to the object side to the image plane.

[0153] ImgH (Image Height) represents half the diagonal length of the effective photosensitive area on the image sensor, also known as the image height.

[0154] The Abbe number, also known as the dispersion coefficient, is the ratio of the difference in refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0155] Aberration is the deviation between the image formed by an uncorrected optical system and the image formed by an ideal optical system. Aberrations include spherical aberration, coma, field curvature, astigmatism, distortion, and chromatic aberration.

[0156] Spherical aberration is a wide beam aberration. When a concentric beam of light emitted from an on-axis point passes through an optical system, it is no longer concentric. Light rays at different incident heights intersect the optical axis at different positions after passing through the system, resulting in varying degrees of deviation from the paraxial image point (ideal image point). This deviation is called axial spherical aberration, or simply spherical aberration. Due to spherical aberration, the image point on the Gaussian image plane is no longer a point, but a circular spot of confusion. The radius of this spot of confusion is called transverse spherical aberration.

[0157] Coma is an aberration of wide beams at off-axis points. In an optical system with coma, the image point formed by an off-axis object point on the ideal image plane resembles a comet-shaped spot. The narrow beams close to the principal ray intersect the principal ray to form a bright spot, while the image points formed by beams of different apertures far from the principal ray are different rings far from the principal ray. Therefore, this imaging defect is called coma.

[0158] Chromatic aberration (CA) occurs because optical materials have different refractive indices for different wavelengths of light. Therefore, light rays of different colors passing through the same aperture will intersect the optical axis at different points. Similarly, light rays of different colors passing through different apertures will also intersect the optical axis at different points. This results in the image of an object point appearing as a colored diffuse spot at any image plane position. The difference in the imaging position and size between various colors of light is called chromatic aberration. There are two types of chromatic aberration: axial chromatic aberration and transverse chromatic aberration.

[0159] Axial chromatic aberration: The difference in the imaging position of two colors of light at a point on the axis is called positional chromatic aberration, also known as axial chromatic aberration.

[0160] Transverse chromatic aberration: The same medium has different refractive indices for different colors of light; therefore, for an off-axis object point, the transverse magnification of different colors of light is not equal.

[0161] This difference is called vertical color difference, also known as magnification color difference.

[0162] Distortion, also known as distortion, is the difference between the height of the intersection point between the principal ray of different fields of view and the Gaussian image plane after passing through the optical lens and the ideal image height.

[0163] Field curvature is used to describe the difference along the optical axis between the position of the sharpest image point after rays from the off-center field of view pass through the optical lens group and the position of the sharpest image point in the central field of view. When field curvature exists, image points beyond the paraxial region on the Gaussian plane become blurred, and the image of a planar object becomes a curved surface of rotation, and a perfect image of the object plane cannot be obtained at the image plane.

[0164] Astigmatism is the axial distance between the meridional and sagittal image points of a narrow beam of light that do not coincide.

[0165] The meridional plane is the plane formed by the principal ray emitted from an object point outside the principal axis of an optical system and the principal axis of the optical system. Rays lying within the meridional plane are collectively called meridional beams. The point formed by a meridional beam is called a meridional image point. The image plane containing the meridional image point is called the meridional image plane.

[0166] The sagittal plane is a plane passing through the principal ray emitted from an object point located outside the principal axis of the optical system and perpendicular to the meridional plane. Rays lying within the sagittal plane are collectively called sagittal beams. The point formed by the sagittal beam is called the sagittal image point. The image plane containing the sagittal image point is called the sagittal image plane.

[0167] Currently, optical lenses have become an important component of electronic devices, allowing users to easily capture desired photos and meet their photography needs. Initially, electronic devices used fixed-focus lenses, meaning their focal length remained constant. These lenses were called fixed-focus lenses. Fixed-focus lenses only corrected for aberrations by focusing on a pair of conjugate surfaces; when the object plane deviated from these surfaces, the image became blurry. As people's demands for image quality in electronic devices increased, fixed-focus lenses could no longer meet the requirements, leading to the development of zoom lenses (or zoom lenses).

[0168] A zoom lens is an optical lens that can change its focal length without changing the shooting position, allowing users to magnify or reduce the size of the object being photographed. The working principle of a zoom lens is based on the physical properties of optical lenses; by changing the position of the lenses inside the lens, the focal length can be adjusted, thus achieving the effect of magnifying or reducing the size of the object being photographed. Zoom lenses are widely used in electronic devices such as mobile phones, tablets, and wearable devices, and how to design zoom lenses has become one of the important topics in the industry.

[0169] Figure 2a is a schematic diagram of an optical lens 10 in the related art, and Figure 2b is a schematic diagram of the zoom and focusing principle of the optical lens 10 shown in Figure 2a. As shown in Figures 2a and 2b, the optical lens 10 is a zoom lens, including a front lens group G0, a first lens group G1, and a second lens group G2 arranged along the object-to-image direction. 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.

[0170] Both the first lens group G1 and the second lens group G2 can move along the optical axis m of the optical lens 10, allowing the optical lens 10 to switch between a short focal length state and a long focal length state. The effective focal length of the optical lens 10 in the short focal length state is less than that in the long focal length state. When the optical lens 10 is in either the short focal length or long focal length state, the front lens group G0 and the second lens group G2 remain relatively fixed along the optical axis m, while the first lens group G1 can move along the optical axis m, allowing the optical lens 10 to switch between focusing on close-up objects (e.g., macro at 250mm) and focusing on distant objects (e.g., at infinity).

[0171] As shown in (1) and (3) of Figure 2b, when the optical lens 10 switches from a short focal length state (distant view) to a long focal length state (distant view), the first lens group G1 and the second lens group G2 both move towards the front lens group G0; when the optical lens 10 switches from a long focal length state (distant view) to a short focal length state (distant view), the first lens group G1 and the second lens group G2 both move away from the front lens group G0.

[0172] As shown in (1) and (2) of Figure 2b, when the optical lens 10 is in a short focal length state and during the process of switching from focusing on a distant view to focusing on a close view, the positions of the front lens group G0 and the second lens group G2 remain unchanged, while the first lens group G1 (i.e. the focusing lens group) moves towards the front lens group G0; when the optical lens 10 switches from focusing on a close view to focusing on a distant view, the first lens group G1 moves away from the front lens group G0.

[0173] As shown in (3) and (4) of Figure 2b, when the optical lens 10 is in telephoto mode and switches from focusing on distant objects to focusing on close objects, the positions of the front lens group G0 and the second lens group G2 remain unchanged, while the first lens group G1 (i.e. the focusing lens group) moves towards the front lens group G0; when the optical lens 10 switches from focusing on close objects to focusing on distant objects, the first lens group G1 moves away from the front lens group G0.

[0174] As shown in Figure 2b, in the related technology, the optical lens 10 performs internal focusing by moving the first lens group G1 in the telephoto state. Therefore, during the process of switching from focusing on the distant scene to focusing on the close scene in the telephoto state, the first lens group G1 needs to move towards the front lens group G0. Since the gap between the front lens group G0 and the second lens group G2 is smaller in the telephoto state than in the short focal length state, the first lens group G1 (i.e., the focusing lens group) has insufficient movement space, thereby increasing the risk of collision between the focusing lens group (first lens group G1) and the front lens group G0.

[0175] Therefore, this application provides an optical lens, a camera module, and an electronic device. When the optical lens is in a telephoto state, the second lens group acts as a focusing lens group for internal focusing. In this way, when the optical lens switches from focusing on a distant scene to focusing on a close scene in the telephoto state, the second lens group moves towards the image side. Since the second lens group has a larger movement gap on the image side when the optical lens is in a telephoto state, the risk of collision of the focusing lens group is reduced, which is beneficial for the optical lens to achieve close-up imaging.

[0176] The technical solutions in some embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0177] The electronic devices in this application embodiment can be mobile phones, tablets, laptops, wearable devices (such as smartwatches), or other electronic devices with camera modules. The following uses a mobile phone as an example to specifically describe the electronic devices in this application embodiment. Other types of electronic devices can be set up with reference to the structure of the mobile phone embodiment, and will not be described in detail here.

[0178] Figure 3 is a schematic diagram of the back of an electronic device (mobile phone) in some embodiments of this application, and Figure 4 is a cross-sectional view (AA) of the electronic device in Figure 3. As shown in Figures 3 and 4, the electronic device includes a housing 200, a display screen 300, and a camera module 100, with the camera module 100 mounted on the housing 200.

[0179] In some embodiments, as shown in Figures 3 and 4, the housing 200 includes a mid-frame 210 (also called a front shell or front frame) and a rear cover 220 (also called a battery cover). The mid-frame 210 is disposed between the display screen 300 and the rear cover 220. The mid-frame 210 includes a bottom wall 211 and a frame 212 disposed at the edge of the bottom wall 211. The rear cover 220, the bottom wall 211, and the frame 212 form a first receiving space 230, in which the camera module 100 is disposed. The display screen 300, the bottom wall 211, and the frame 212 form a second receiving space 240. The second receiving space 240 is used to house electronic components such as a motherboard 400. The motherboard 400 is connected to the display screen 300 and the camera module 100 via flexible circuit boards.

[0180] The display screen 300 can be either a liquid crystal display (LCD) or an OLED (Organic Light-Emitting Diode) display; no specific limitation is made here. In addition to being installed in the first receiving space 230, the camera module 100 can also be installed in the second receiving space 240 to serve as a front-facing camera module for an electronic device. The mid-frame 210 is not limited to a structure including a bottom wall 211 and a border 212; it can also be configured with other structures depending on the actual situation, such as the mid-frame 210 only including the border 212. The mid-frame 210 and the back cover 220 can be an integral structure or separate components; no specific limitation is made here.

[0181] In some embodiments, as shown in Figures 3 and 4, the camera module 100 includes a camera housing 50, an optical lens 10, and a photosensitive element 20. The main body of the optical lens 10 is located inside the camera housing 50, and a portion of the lens of the optical lens 10 is located outside the camera housing 50. The optical lens 10 is disposed opposite to the light-transmitting window 221 provided on the rear cover 220. The photosensitive element 20 is disposed in the camera housing 50 and located on the image side of the optical lens 10.

[0182] The optical lens 10 mainly uses the refraction principle of the lens to form an image. That is, the light of the subject enters the optical lens 10 through the light transmission window 221, forming a clear image on the focal plane of the optical lens 10. The image of the subject is recorded by the photosensitive element 20 located at the focal plane. The photosensitive element 20 converts the optical image into an electrical signal and transmits it to the processor on the motherboard 400. The processor transmits the electrical signal to the display screen 300 to display the image of the subject on the display screen 300.

[0183] The photosensitive element 20 (also known as an image sensor) is a semiconductor chip containing hundreds of thousands to millions of photodiodes on its surface, which generate electrical charges when exposed to light. The photosensitive element 20 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device; no specific limitation is made here.

[0184] In some embodiments, as shown in FIG4, the camera module 100 further includes a filter 30, which is disposed between the optical lens 10 and the photosensitive element 20. The filter 30 is used to filter out unwanted wavelengths in the light, preventing the photosensitive element 20 from producing false colors or ripples, thereby improving its effective resolution and color reproduction. As shown in FIG4, the filter 30 can be an infrared filter.

[0185] Of course, the filter 30 is not limited to being disposed between the optical lens 10 and the photosensitive element 20; the filter 30 can also be attached to the surface of the lens in the optical lens 10.

[0186] Figure 5 is a schematic diagram of the optical lens 10 in the first embodiment of this application in the short focal length state, and Figure 6 is a schematic diagram of the optical lens 10 in the first embodiment of this application in the long focal length state. As shown in Figures 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 the object-to-image direction; 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.

[0187] The optical lens 10 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. The first lens group G1 and the second lens group G2 can be moved relative to the front lens group G0 along the lens optical axis 5, so that the optical lens 10 can switch between a short focal length state (as shown in Figure 5) and a long focal length state (as shown in Figure 6).

[0188] As shown in Figures 5 and 6, when the optical lens 10 switches from a short focal length to a long focal length, both the first lens group G1 and the second lens group G2 move towards the front lens group G0 (i.e., to the left in Figures 4 and 5). When the optical lens 10 switches from a long focal length to a short focal length, both the first lens group G1 and the second lens group G2 move away from the front lens group G0 (i.e., to the right in Figures 5 and 6). The first lens group G1 can be a zoom group and moves along the lens optical axis 5 to change the effective focal length of the optical lens 10; the second lens group G2 can be a compensation group and moves along the lens optical axis 5 to compensate for the image plane drift of the optical lens 10.

[0189] As shown in Figures 4, 5 and 6, the camera module 100 also includes a drive motor 40, which is used to drive the first lens group G1 and the second lens group G2 to move along the lens optical axis 5.

[0190] The drive motor 40 can be any one of the following: a voice coil motor, a piezoelectric motor, a shape memory alloy (SMA) motor, a MEMS motor, a suspension wire motor, and a ball bearing motor. For example, as shown in Figure 4, the drive motor 40 can be a voice coil motor, which includes a magnet 40a, a first coil 40b, and a second coil 40c. The magnet 40a is fixed to the inner wall of the camera housing 50. The optical lens 10 also includes a first fixing cylinder 31 and a second fixing cylinder 32. The first lens group G1 is installed in the first fixing cylinder 31, the first coil 40b is disposed on the first fixing cylinder 31, the second lens group G2 is installed in the second fixing cylinder 32, and the second coil 40c is disposed on the second fixing cylinder 32. When the first coil 40b is energized, the magnetic field generated by the first coil 40b interacts with the magnetic field generated by the magnet 40a to generate a first driving force. This first driving force drives the first lens group G1 to move along the lens optical axis 5 through the first fixed cylinder 31. When the second coil 40c is energized, the magnetic field generated by the second coil 40c interacts with the magnetic field generated by the magnet 40a to generate a second driving force. This second driving force drives the second lens group G2 to move along the lens optical axis 5 through the second fixed cylinder 32.

[0191] Figure 7a is an optical schematic diagram of the optical lens 10 in the first embodiment of this application switching between short focal length and long focal length. In Figure 7a, (1) shows the state diagram of the optical lens 10 in the first embodiment of this application in short focal length and focusing on a distant view; (2) shows the state diagram of the optical lens 10 in the first embodiment of this application in short focal length and focusing on a close view; (3) shows the state diagram of the optical lens 10 in the first embodiment of this application in long focal length and focusing on a distant view; and (4) shows the state diagram of the optical lens 10 in the first embodiment of this application in long focal length and focusing on a close view.

[0192] As shown in (1) and (2) of Figure 7a, when the optical lens 10 is in short focal length mode, the front lens group G0 and the second lens group G2 remain relatively fixed along the optical axis 5 of the lens, and the first lens group G1 can move along the optical axis 5 of the lens to allow the optical lens 10 to switch between focusing on close-up and focusing on distant objects; as shown in (3) and (4) of Figure 7a, when the optical lens 10 is in long focal length mode, the front lens group G0 and the first lens group G1 remain relatively fixed along the optical axis 5 of the lens, and the second lens group G2 can move along the optical axis 5 of the lens to allow the optical lens 10 to switch between focusing on close-up and focusing on distant objects. That is: when the optical lens 10 is in short focal length mode, the first lens group G1 is the focusing lens group for internal focusing; when the optical lens 10 is in long focal length mode, the second lens group G2 is the focusing lens group for internal focusing.

[0193] As shown in (1) and (3) of Figure 7a, when the optical lens 10 is focused on a distant scene, during the process of switching the optical lens 10 from a short focal length state to a long focal length state, the first lens group G1 moves towards the front lens group G0, and the second lens group G2 moves towards the front lens group G0. As shown in (1) and (2) of Figure 7a, when the optical lens 10 is in a short focal length state and switches from focusing on a distant scene to focusing on a close scene, the positions of the front lens group G0 and the second lens group G2 on the lens optical axis 5 are relatively fixed, and the first lens group G1 moves towards the front lens group G0. As shown in (3) and (4) of Figure 7a, when the optical lens 10 is in a long focal length state and switches from focusing on a distant scene to focusing on a close scene, the positions of the front lens group G0 and the first lens group G1 on the lens optical axis 5 are relatively fixed, and the second lens group G2 moves away from the front lens group G0, that is, the second lens group G2 moves towards the image side.

[0194] It is important to understand that the optical lens 10 has a first focal length when in telephoto mode and a second focal length when in short focal length mode. The maximum value of the first focal length is greater than the maximum value of the second focal length. The minimum value of the first focal length can be greater than or less than the maximum value of the second focal length; no specific limitation is made here. For example, the first focal length can be 24mm–29mm, and the second focal length can be 18mm–22mm; or, for example, the first focal length can be 16mm–42mm, and the second focal length can be 17mm–21mm. When the optical lens 10 is in short focal length mode 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 second focal length. When the optical lens 10 is in telephoto mode and the second lens group G2 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 first focal length.

[0195] In this context, focusing on a close-up scene with the optical lens 10 means that the optical lens 10 can clearly image the subject at a first object distance. Focusing on a distant scene with the optical lens 10 means that the optical lens 10 can clearly image the subject at a second object distance, where the second object distance is greater than the first object distance. In telephoto mode, the first object distance is the maximum object distance at which the optical lens 10 can clearly image, such as infinity, and the second object distance is the minimum object distance at which the optical lens 10 can clearly image, such as 20mm. In short-focus mode, the first object distance is the maximum object distance at which the optical lens 10 can clearly image, such as infinity, and the second object distance is the minimum object distance at which the optical lens 10 can clearly image, such as 75mm.

[0196] In this embodiment of the optical lens 10, when the optical lens 10 is in telephoto mode, the second lens group G2 is used as the focusing lens group for internal focusing. In this way, during the process of switching from focusing on the distant scene to focusing on the near scene in telephoto mode, the second lens group G2 moves towards the image side. Since the image side of the second lens group G2 has a larger movement gap when the optical lens 10 is in telephoto mode (this is because during the process of switching from short focal length mode to telephoto mode, both the first lens group G1 and the second lens group G2 move towards the front lens group G0, increasing the gap on the side of the second lens group G2 away from the front lens group G0 (image side)), the second lens group G2 has sufficient movement space, thereby reducing the risk of collision between the second lens group G2 (i.e., the focusing lens group) and its image-side optical elements (such as the filter 30), which is beneficial for the optical lens 10 to achieve near-field imaging.

[0197] The following sections provide a detailed description of some important parameters of the optical lens 10 and their value ranges. These parameters include the back focal length BFL, the gap width δ between the second lens group G2 and the first lens group G1, the focusing stroke compression ratio ξ, the minimum value of the focusing stroke compression ratio ξmin, the first optical power allocation ratio α, the second optical power allocation ratio β, the third optical power allocation ratio γ, the moving distance of the first lens group G1 and the second lens group G2 during zooming and focusing, and the closest focusing distance U. 01min Maximum optical zoom ratio Г max Maximum system zoom ratio Г′ max wait.

[0198] In some embodiments, as shown in FIG7a, when the optical lens 10 is in telephoto mode and focusing on a distant scene, the back focal length (BFL) of the optical lens 10 satisfies: BFL ≥ 9.6mm, for example, BFL can be 15.566mm, 16.947mm, 13.665mm, 14.393mm, 12.035mm, 9.672mm, etc. This setting avoids the back focal length (BFL) being too small when the optical lens 10 is in telephoto mode and focusing on a close-up scene. If the back focal length (BFL) is set too small, the space on the image side of the second lens group G2 is reduced, which is not conducive to further reducing the risk of the second lens group G2 colliding with its image-side optical elements during inward focusing. By setting the back focal length (BFL) of the optical lens 10 to: BFL ≥ 9.6mm, the risk of the second lens group G2 colliding with its image-side optical elements during inward focusing can be significantly reduced.

[0199] Among them, the back focal length BFL of the optical lens 10 refers to the axial distance from the last optical surface of the second lens group G2 (i.e., the optical surface closest to the image plane) to the image plane (i.e., the photosensitive surface of the photosensitive element 20), such as the length of line segment a1a2 shown in Figures 5 and 6; or the length of line segment a5a6 + line segment a6a7 shown in Figure 10.

[0200] In some embodiments, as shown in FIG7a, when the optical lens 10 is in telephoto mode and focusing on a distant scene, the back focal length (BFL) is ≤17.0mm. For example, the BFL can be 15.566mm, 16.947mm, 13.665mm, 14.393mm, 12.035mm, 9.672mm, etc. This setting avoids setting the back focal length (BFL) to be too large. If the back focal length (BFL) is set too large, the camera module 100 needs to be designed with a large size to accommodate this long back focal length (BFL), which is not conducive to the miniaturization of the camera module 100. By setting the back focal length (BFL) of the optical lens 10 to ≤17.0mm, the size of the camera module 100 can be avoided to prevent it from being too large, which is conducive to the miniaturization of the camera module 100.

[0201] In some embodiments, as shown in (4) of Figure 7a, when the optical lens 10 is in telephoto mode and focusing on a close-up, the BFL satisfies: BFL ≥ 2.2mm. For example, BFL can be 14.437mm, 15.512mm, 11.591mm, 12.609mm, 2.221mm, 3.855mm, etc. With this setting, when the optical lens 10 is in telephoto mode and focusing on a close-up, sufficient safety space can be provided on the image side of the second lens group G2 to avoid collision between the second lens group G2 and its image-side optical elements under the action of external forces (such as the inertial force generated when an electronic device is dropped).

[0202] In some embodiments, as shown in (4) of Figure 7a, when the optical lens 10 is in telephoto mode and focusing on a close-up, the BFL satisfies: BFL ≤ 15.6mm. For example, BFL can be 14.437mm, 15.512mm, 11.591mm, 12.609mm, 2.221mm, 3.855mm, etc. This setting can avoid the camera module 100 from being too large, thereby facilitating the miniaturization of the camera module 100.

[0203] In some embodiments, as shown in FIG7a, when the optical lens is in the telephoto state and focusing on a distant scene, the gap width δ between the second lens group G2 and the first lens group G1 satisfies: δ ≥ 0.7 mm. For example, δ can be 1.095 mm, 1.197 mm, 1.021 mm, 1.008 mm, 6.110 mm, 0.723 mm, etc. With this setting, during the process of the optical lens switching from focusing on a distant scene to focusing on a close-up scene, there can be sufficient safety space between the second lens group G2 and the first lens group G1, thereby significantly reducing the risk of collision between the second lens group G2 and the first lens group G1.

[0204] The gap width δ between the second lens group G2 and the first lens group G1 refers to the width of the gap between the second lens group G2 and the first lens group G1 on the optical axis, such as the length of line segment a3a4 shown in Figures 5 and 6.

[0205] In some embodiments, as shown in FIG7a, when the optical lens is in the telephoto state and focusing on a distant scene, the gap width δ satisfies: δ≤1.2mm. This setting can avoid the overall space occupied by the lens group in the optical lens 10 being too large, which is beneficial to reducing the size of the optical lens 10, and thus beneficial to the miniaturization of the camera module 100.

[0206] In some embodiments, as shown in (4) of FIG7a, when the optical lens 10 is in telephoto mode and focusing on a close-up, δ satisfies: δ≥2.1mm, for example, δ can be 2.225mm, 2.633, 3.095mm, 2.791mm, 15.923mm, 10.831mm, 7.667mm, etc. With this setting, when the optical lens 10 focuses on a close-up, there can be sufficient safety space between the second lens group G2 and the first lens group G1 to avoid collision between the second lens group G2 and the first lens group G1 under the action of external force (such as the inertial force generated when the electronic device is dropped).

[0207] In some embodiments, as shown in (4) of FIG7a, when the optical lens 10 is in telephoto mode and focusing on close-up objects, δ satisfies δ≤16mm, for example, δ can be 2.225mm, 2.633, 3.095mm, 2.791mm, 15.923mm, 10.831mm, etc. This setting can avoid the overall space occupied by the lens group in the optical lens 10 being too large, which is conducive to reducing the volume of the optical lens 10, and thus conducive to the miniaturization of the camera module 100.

[0208] The following details the moving distance of the first lens group G1 and the moving distance of the second lens group G2 during zooming and focusing of the optical lens 10, as well as their value ranges.

[0209] In some embodiments, as shown in FIG7a, during the process of the optical lens 10 switching from a short focal length state to a long focal length state, the maximum value Δmax of the movement distance Δ of the second lens group G2 in the direction closer to or away from the front lens group G0 satisfies: Δmax ≤ 15.5mm. For example, Δmax can be 3.388mm, 15.344mm, 10.342mm, 11.064mm, etc. This setting can avoid the maximum value Δmax of the movement distance Δ of the second lens group G2 being too large when the optical lens 10 switches between the short focal length state and the long focal length state, thereby helping to reduce the size of the drive motor 40 of the second lens group G2, and thus contributing to the miniaturization of the camera module 100.

[0210] It is important to understand that, as shown in Figure 7a, the movement distance Δ of the second lens group G2 includes the first focusing movement distance Δ1 and the first optical zoom movement distance Δ2. The first focusing movement distance Δ1 is the movement distance of the second lens group G2 when the optical lens 10 is in telephoto mode, during the process of switching from focusing on a distant scene to focusing on a close-up scene. The first optical zoom movement distance Δ2 is the movement distance of the second lens group G2 when the optical lens 10 is focusing on a distant scene, during the process of switching from focusing on a short focal length to focusing on a telephoto scene. The maximum value Δmax of the movement distance Δ of the second lens group G2 is equal to the larger of the first optical zoom movement distance Δ2 and the first focusing movement distance Δ1.

[0211] In some embodiments, as shown in FIG7a, the first focusing movement distance Δ1 of the second lens group G2 satisfies: Δ1 ≤ 14.8 mm. For example, Δ1 can be 1.130 mm, 1.435 mm, 2.074 mm, 1.784 mm, 14.726 mm, 9.81 mm, 6.943 mm, etc. This setting avoids the first focusing movement distance Δ1 being too large. If the first focusing movement distance Δ1 is too large, the space on the image side of the second lens group G2 will be reduced, which is not conducive to further reducing the risk of collision between the second lens group G2 and its image-side optical elements. By setting the first focusing movement distance Δ1 to Δ1 ≤ 14.8 mm, the risk of collision between the second lens group G2 and its image-side optical elements can be significantly reduced.

[0212] In some embodiments, as shown in FIG7a, the first focusing movement distance Δ1 of the second lens group G2 satisfies: Δ1 ≥ 2.0 mm, for example, Δ1 can be 1.130 mm, 1.435 mm, 2.074 mm, 1.784 mm, 14.726 mm, 9.81 mm, 6.943 mm, etc. This setting avoids the first focusing movement distance Δ1 being too small. If the first focusing movement distance Δ1 is too small, the driving accuracy requirement of the drive motor 40 of the second lens group G2 increases, which is not conducive to cost reduction. By setting the first focusing movement distance Δ1 to Δ1 ≥ 2.0 mm, the driving accuracy requirement of the drive motor 40 of the second lens group G2 can be reduced.

[0213] The driving precision of the drive motor 40 refers to the ability of the drive motor 40 to accurately achieve the desired output such as rotation speed, rotation angle, and displacement according to the given instructions or control signals.

[0214] In some embodiments, as shown in FIG7a, the first optical zoom movement distance Δ2 of the second lens group G2 satisfies: Δ2=|-nf g2 |≤15.5mm; for example, Δ2 can be 3.388mm, 15.344mm, 10.342mm, 11.064mm, etc.

[0215] Among them, f g2 Let α be the effective focal length of the second lens group G2, and let n be the difference between the value of α when the optical lens 10 is in telephoto mode and the value of α when it is in telephoto mode, i.e.: n = α l -α s ; where α s The value of the second optical power allocation ratio α when the optical lens 10 is in short focal length mode; α l The value of the second optical power allocation ratio α when the optical lens 10 is in telephoto mode.

[0216] From the relation Δ2=|-nf g2It can be seen that Δ2 is related to the first optical power distribution ratio α and the effective focal length f of the second lens group G2. g2 Relatedly, by setting f appropriately g2 The size of α can control the first optical zoom movement distance Δ2 of the second lens group G2, thereby controlling the volume of the drive motor 40 of the second lens group G2, and thus controlling the volume of the camera module 100.

[0217] In some embodiments, as shown in FIG7a, during the process of the optical lens 10 switching from a short focal length state to a long focal length state, the maximum value qmax of the distance q that the first lens group G1 moves towards or away from the front lens group G0 satisfies: qmax ≤ 9.0mm, for example, qmax can be 2.975mm, 8.907mm, 6.604mm, 6.902mm, etc. This setting can avoid the maximum value qmax of the moving distance q of the first lens group G1 being too large when the optical lens 10 switches between the short focal length state and the long focal length state, thereby helping to reduce the size of the drive motor 40 of the first lens group G1, and thus contributing to the miniaturization of the camera module 100.

[0218] It is important to understand that, as shown in Figure 7a, the movement distance q of the first lens group G1 includes the second focusing movement distance q1 and the second optical zoom movement distance q2. The second focusing movement distance q1 is the movement distance of the first lens group G1 when the optical lens 10 is in short focal length mode, during the process of switching the optical lens 10 from focusing on a distant scene to focusing on a close-up scene. The second optical zoom movement distance q2 is the movement distance of the first lens group G1 when the optical lens 10 is focusing on a distant scene, during the process of switching the optical lens 10 from short focal length mode to long focal length mode. The maximum value qmax of the movement distance q of the first lens group G1 is equal to the larger of the second optical zoom movement distance q2 and the second focusing movement distance q1.

[0219] In some embodiments, as shown in FIG7a, the second focusing movement distance q1 of the first lens group G1 satisfies: q1 ≤ 6.0 mm, for example, q1 can be 2.975 mm, 5.112 mm, 5.939 mm, 5.512 mm, 4.203 mm, etc. This setting avoids the second focusing movement distance q1 being too large. If the second focusing movement distance q1 is too large, the space on the object side of the first lens group G1 is reduced, increasing the risk of collision between the first lens group G1 and its object-side optical elements (such as the front lens group G0). By setting the second focusing movement distance q1 to q1 ≤ 6.0 mm, the risk of collision between the first lens group G1 and its object-side optical elements can be greatly reduced.

[0220] In some embodiments, as shown in FIG7a, the second focusing movement distance q1 of the first lens group G1 satisfies: q1 ≥ 2.9 mm, for example, q1 can be 2.975 mm, 5.112 mm, 5.939 mm, 5.512 mm, 4.203 mm, etc. This setting avoids the second focusing movement distance q1 being too small. If the second focusing movement distance q1 is too small, it increases the driving accuracy requirement of the drive motor 40 of the first lens group G1, which is not conducive to cost reduction. By setting the second focusing movement distance q1 to q1 ≥ 2.9 mm, the driving accuracy requirement of the drive motor 40 of the first lens group G1 can be reduced.

[0221] In some embodiments, as shown in FIG7a, the second optical zoom movement distance q2 satisfies: q2=|mf g1 |≤9.0mm; for example, q2 can be 2.785mm, 8.907mm, 6.604mm, 6.902, etc.

[0222] Among them, f g1 Let be 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 short focal length mode and the value of 1 / β when it is in long focal length mode, i.e., when the optical lens 10 is focusing on a distant scene (e.g., the object distance of the subject is infinite).

[0223] In the formula β s When the optical lens 10 is in a short focal length state and focusing on a distant scene, the value of the second optical power allocation ratio β is given; β l The value of the second optical power distribution ratio β is when the optical lens 10 is in telephoto mode and focusing on a distant scene.

[0224] From the relation q2=|mf g1 It can be seen that q2 is related to the second optical power allocation ratio β and the effective focal length f of the first lens group G1. g1 Relatedly, by setting f appropriately g1 The size of β can control the second optical zoom moving distance q2 of the first lens group G1, thereby controlling the volume of the drive motor 40 of the first lens group G1, and thus controlling the volume of the camera module 100.

[0225] The following discussion focuses on the relation q2=|mf g1 |、Δ2=|-nf g2 The derivation process of | will be explained in detail.

[0226] Figure 7b is a second optical principle diagram of the optical lens 10 in the first embodiment of this application switching between short focal length and long focal length. In Figure 7b, (1) shows the optical path diagram when the optical lens 10 in the first embodiment of this application is in short focal length, and (2) shows the optical path diagram when the optical lens 10 in the first embodiment of this application is in long focal length. As shown in Figure 7b, when the optical lens 10 focuses on a distant scene and the subject is at infinity (i.e., the object distance is infinite), the image formed by the light emitted from the subject through the front lens group G0 is m0, and the image distance of the image m0 is V0 = f. g0 Image m0, after passing through the first lens group G1, forms image m1. Image m1, after passing through the second lens group G2, forms the final image IMA. Under the paraxial optical path model, the combined system G01, consisting of groups G0 and G1, has the following gap between the image-side principal plane of group G0 and the object-side principal plane of the first lens group G1:

[0227] The object distance from m0 to the first lens group G1 is U1 = d 01 -V0. The image distance V1 of image m1 is calculated according to the Gaussian formula as follows:

[0228] The optical lens 10 mainly consists of three lens groups: a front lens group G0, a first lens group G1, and a second lens group G2. The optical lens 10 can also be considered a secondary combination of a combined 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 combined system G01 and the object-side principal plane of the second lens group G2 is:

[0229] Based on the definition of image distance as the distance from the image principal plane to the image plane, the distance 'a' from the image principal plane of the combined system G01 to the first lens group G1 is:

[0230] The distance between the image principal plane of the first lens group G1 and the object principal plane of the second lens group G2 is d. 12 ,Right now:

[0231] d 12 =d 012 -a;

[0232] From the above equation, we can deduce that:

[0233] The object distance U2 of the second lens group G2 is:

[0234] The image distance V2 of the second lens group G2 is:

[0235] When the subject is at infinity (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.

[0236] Because the second optical power allocation ratio β = f g01 / f g0 The first power distribution ratio α = F / f g01 ;

[0237] therefore,

[0238] After sorting, we can conclude that:

[0239] In the optical lens 10, the movement of the first lens group G1 and the second lens group G2 along the optical axis 5 changes the effective focal length of the optical lens 10. Following the principle that the image plane of the optical lens 10 remains constant, the TOTR remains constant during the zooming process of the optical lens 10. Therefore, differentiating the TOTR satisfies the following:

[0240] d(TOTR) = 0;

[0241] Right now:

[0242] Therefore, the zoom differential equation can be obtained as follows:

[0243] Solving the above differential equation for zoom yields a general solution as follows, where c is a constant.

[0244] When the calculation starting point is a telephoto lens, the following definition is defined:

[0245] Among them, F l f is the effective focal length F of the optical lens 10 when it is in telephoto mode; g01l When the optical lens 10 is in telephoto mode, the combined focal length f of the front lens group G0 and the first lens group G1 is... g01 The value of .

[0246] therefore,

[0247] Eliminating the constant c, the equation transforms into a quadratic equation in α as follows:

[0248] Define parameter b as follows:

[0249] Solving the quadratic equation in one variable yields α as follows:

[0250] The α value of the optical lens 10 in either telephoto or focal length mode can be calculated based on the starting point of the calculation. This starting point can also be from the focal length mode, and can be freely adjusted according to actual design requirements.

[0251] Solving the above equation requires satisfying the following conditions:

[0252] b 2 -4≥0;

[0253] 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:

[0254] The movement of the first lens group G1 achieves d 01 The change allows for differentiation, and the effective focal length f of the first lens group G1 can be compared with this. g1 Related to β, as shown below:

[0255] Integrate the movement of the first lens group G1 from 0 to q2, and β from the starting point of the calculation β l Integrating to any state β, we obtain:

[0256] We can conclude that:

[0257] Then the second optical zoom movement distance q2 of the first lens group G1 is:

[0258] Among them, coefficient

[0259] During optical zoom, the movement of the second lens group G2 affects the image distance of the second lens group G2. According to the aforementioned process, the image distance V2 of the second lens group G2 is:

[0260] The image distance V2 of the second lens group G2 is differentiated as follows:

[0261] dV2=-f g2 dα;

[0262] Therefore, the movement of the G2 group can be integrated from 0 to Δ2, with the parameter α integrated from 0 to α. l The calculation is as follows:

[0263] The first optical zoom movement distance Δ2 of the second lens group G2 is converted into: Δ2=-f g2 ×(α-αl );

[0264] When optical lens 10 switches from short focal length to long focal length, the first optical zoom movement distance Δ2 of the second lens group G2 is: Δ2=|-f g2 ×(α l -α s )|=|-nf g2 ;

[0265] Where, coefficient n = α l -α s .

[0266] The following section details the focusing stroke compression ratio ξ, the first optical power distribution ratio α, the second optical power distribution ratio β, and their value ranges for the optical lens 10.

[0267] The focusing stroke compression ratio ξ (also known as the focusing sensitivity parameter sens) is defined as: the focusing stroke of the entire optical lens 10 (excluding the transition element) as a focusing lens group (or the amount of image plane movement of the optical lens 10 during focusing) divided by the focusing stroke of a specific lens group within the optical lens 10 (such as the first lens group G1 or the second lens group G2) as a focusing lens group. A larger focusing stroke compression ratio ξ results in a smaller focusing stroke for the focusing lens group; conversely, a smaller focusing stroke compression ratio ξ results in a larger focusing stroke for the focusing lens group. For a detailed description of the focusing stroke compression ratio ξ and its expression, please refer to the applicant's earlier patent applications with patent numbers 202410875013.7, 202311092486.1, and 202410023387.6.

[0268] In some embodiments, as shown in FIG6, when the optical lens 10 is in a telephoto state, the minimum value of the focusing stroke compression ratio ξmin, the first optical power distribution ratio α, the effective focal length F of the optical lens, and the combined focal length f of the front lens group (G0) and the first lens group (G1) are... g01 Satisfy: ξmin=|1-α 2 |≤2.8; for example, ξmin can be 2.722, 2.749, 2.367, etc. Where α=F / f g01 This configuration avoids an excessively large minimum focusing stroke compression ratio ξmin when the optical lens 10 is in telephoto mode. Consequently, it prevents the focusing stroke of the focusing lens group (i.e., the second lens group G2) from being too short when the optical lens 10 switches between focusing on close-up and focusing on distant objects. This helps to reduce the precision requirements of the drive motor 40 of the focusing lens group, thereby reducing the cost of the camera module of the electronic device.

[0269] As for the minimum value of the focusing stroke compression ratio ξmin=|1-α2 For details on the derivation process of |, please refer to the applicant's prior application in patent application number 202410023387.6.

[0270] In some embodiments, as shown in FIG6, when the optical lens 10 is focusing on a distant scene (e.g., the object distance of the subject is infinite), when the optical lens 10 is in telephoto mode and the effective focal length F of the optical lens 10 is the maximum value of the first focal length, the minimum value of the focusing stroke compression ratio ξmin satisfies: 2.3≤ξmin≤2.8. For example, ξmin can be 2.722, 2.749, 2.367, etc. This setting can avoid the minimum value of the focusing stroke compression ratio ξmin being too large or too small when the optical lens 10 is in telephoto mode. It can reduce the focusing stroke of the focusing lens group (i.e., the second lens group G2), which is beneficial to reducing the size of the driving motor 40 of the focusing lens group; it can also avoid the focusing stroke of the focusing lens group being too short, which reduces the accuracy requirements of the driving motor 40 of the second lens group G2, and is beneficial to reducing the cost of the camera module.

[0271] In some embodiments, as shown in FIG5, when the optical lens 10 is in a short focal length state, the focusing stroke compression ratio ξ, the first optical power allocation ratio α, the second optical power allocation ratio β, the effective focal length F of the optical lens 10, and the effective focal length f of the front lens group G0 are... g0 The combined focal length f of the front lens group G0 and the first lens group G1 g01 Satisfy: ξ=(1-β) 2 )α 2 ≤2.4; for example, ξ can be 2.370, 1.147, 1.439, 1.405, etc.; where β=f g01 / f g0 This configuration avoids an excessively large focusing stroke compression ratio ξ when the optical lens 10 is in a short focal length state. Consequently, it prevents the focusing stroke of the focusing lens group (i.e., the first lens group G1) from being too small when the optical lens 10 switches between focusing on close-up and focusing on distant objects. This helps to reduce the precision requirements of the drive motor 40 of the focusing lens group, thereby reducing the cost of the camera module of the electronic device.

[0272] As for the focusing stroke compression ratio ξ=(1-β) 2 )α 2 The derivation process can be found in the applicant's earlier applications with patent application numbers 202410875013.7 and 202311092486.1, and will not be repeated here.

[0273] In some embodiments, as shown in FIG5, when the optical lens 10 is focusing on a distant scene (e.g., the object distance of the subject is infinite), when the optical lens 10 is in a short focal length state and the effective focal length of the optical lens 10 is the minimum value of the second focal length, ξ satisfies: 1.1≤ξ≤2.4; for example, ξ can be 2.370, 1.147, 1.439, 1.405, etc. This setting can avoid the focusing stroke compression ratio ξ being too large or too small when the optical lens 10 is in a short focal length state. It can reduce the focusing stroke of the focusing lens group (i.e., the first lens group G1), which is beneficial to reducing the size of the driving motor 40 of the focusing lens group; it can also avoid the focusing stroke of the focusing lens group being too short, which reduces the accuracy requirements of the driving motor 40 of the focusing lens group and helps to reduce the cost of the camera module.

[0274] In some embodiments, α satisfies: 1.1 ≤ |α| ≤ 2; for example, α can be 1.667, 1.929, 1.105, 1.936, 1.255, 1.835, 1.224, etc. From the relation ξmin=|1-α 2 |、ξ=(1-β 2 )α 2 It can be seen that ξ and ξmin are both proportional to |α|. By setting the range of α to 1.1≤|α|≤2, the focusing stroke compression ratio ξ of the optical lens 10 can be avoided to be too large or too small. This can reduce the focusing stroke of the focusing lens group, which is beneficial to reducing the size of the drive motor 40. It can also avoid the focusing stroke of the focusing lens group being too short, which reduces the accuracy requirements of the drive motor 40 and helps to reduce the cost of the camera module.

[0275] In some embodiments, as shown in FIG5, when the optical lens 10 is focusing on a distant scene (e.g., the object distance of the subject is infinite), when the optical lens 10 is in a short focal length state and the effective focal length of the optical lens 10 is the minimum value of the second focal length, α satisfies: 1.1≤|α|≤1.67; for example, α can be 1.667, 1.105, 1.255, 1.224, etc. This setting can avoid the optical lens 10 being too large or too small when it is in a short focal length state, thereby avoiding the focusing stroke compression ratio ξ being too large or too small. This can reduce the focusing stroke of the focusing lens group (i.e., the first lens group G1), which is beneficial to reducing the size of the driving motor 40 of the focusing lens group; it can also avoid the focusing stroke of the focusing lens group being too short, reducing the accuracy requirements of the driving motor 40 of the focusing lens group, which is beneficial to reducing the cost of the camera module.

[0276] In some embodiments, as shown in FIG6, when the optical lens 10 is focused on a distant scene (e.g., the object distance of the photographed scene is infinite), when the optical lens 10 is in telephoto mode and the effective focal length of the optical lens 10 is the maximum value of the first focal length, α satisfies: 1.83≤|α|≤1.94; for example, α can be 1.929, 1.835, 1.936, etc. This setting can avoid the optical lens 10 being too large or too small when it is in telephoto mode, thereby avoiding the focusing stroke compression ratio ξ being too large or too small. This can reduce the focusing stroke of the first focusing lens group (i.e., the second lens group G2), which is beneficial to reducing the size of the driving motor of the focusing lens group; it can also avoid the focusing stroke of the focusing lens group being too short, reducing the accuracy requirements of the driving motor 40 of the focusing lens group, which is beneficial to reducing the cost of the camera module.

[0277] In some embodiments, β satisfies: 0.24 ≤ |β| < 1, for example, β can be -0.384, -0.44, -0.245, -0.289, -0.294, -0.343, -0.248, etc. From the relation ξ = (1 - β) 2 )α 2 It can be seen that ξ is inversely proportional to |β|. By setting the range of |β| to 0.24≤|β|<1, we can avoid |β| being too small when the optical lens 10 is in a short focal length state, so as to avoid the focusing stroke compression ratio ξ being too large. This can prevent the focusing stroke of the focusing lens group (i.e. the first lens group G1) from being too short, reduce the accuracy requirements of the driving motor 40 of the focusing lens group, and thus help reduce the cost of the camera module.

[0278] In some embodiments, as shown in FIG5, when the optical lens 10 is focusing on a distant scene (e.g., the object distance of the subject is infinite), when the optical lens 10 is in a short focal length state and the effective focal length of the optical lens 10 is the minimum value of the second focal length, β satisfies: 0.24≤|β|≤0.39; for example, β can be -0.384, -0.245, -0.294, -0.248, etc. This setting can avoid the optical lens 10 from having an excessively large |β| when it is in a short focal length state, so as to avoid the focusing stroke compression ratio ξ being too small. This allows for a reduction in the focusing stroke of the first lens group G1, which is beneficial to reducing the size of the drive motor 40 of the focusing lens group (i.e., the first lens group G1).

[0279] The third power distribution ratio γ of the optical lens 10 and its value range are described in detail below.

[0280] In some embodiments, as shown in Figures 5 and 6, the third power distribution ratio γ = F / f g0γ satisfies |γ|≤0.86; for example, γ can be -0.640, -0.850, -0.271, -0.560, -0.370, -0.629, -0.304, etc. Since |γ|≤0.86, this means that the effective focal length of the front lens group G0 is longer than the effective focal length of the optical lens 10. This means that when the front lens group G0 performs image stabilization, the MTF loss of the optical lens 10 can be reduced, which is beneficial to improving the image quality of the optical lens 10. At the same time, setting |γ| to less than or equal to 0.86 can also avoid the total length of the optical lens 10 being too large, thereby reducing the overall size and weight of the optical lens 10.

[0281] It is important to understand that there is a certain relationship between |γ| and the amount of MTF loss: if |γ| is smaller, then the amount of MTF loss of the optical lens 10 is smaller, so that when the current lens group G0 performs image stabilization, the optical lens 10 can be guaranteed to have high image quality; if |γ| is larger, then the amount of MTF loss of the optical lens 10 is larger, so that when the current lens group G0 performs image stabilization, the image quality of the optical lens 10 decreases.

[0282] In some embodiments, as shown in FIG5, when the optical lens 10 is focusing on a distant scene, when the optical lens 10 is in a short focal length state and the effective focal length of the optical lens 10 is the minimum value of the second focal length, the third optical power allocation ratio γ, the first optical power allocation ratio α, the second optical power allocation ratio β, and the focusing stroke compression ratio ξ satisfy:

[0283] For example, γ can be -0.640, -0.271, -0.370, -0.304, etc. With this setting, when the current lens group G0 performs image stabilization, the MTF loss of the optical lens 10 can be reduced; at the same time, it helps to reduce the size of the optical lens 10 when it is in a short focal length state.

[0284] In some embodiments, as shown in FIG6, when the optical lens 10 is focused on a distant scene (e.g., the object distance of the subject is infinity), when the optical lens 10 is in telephoto mode and the effective focal length of the optical lens 10 is the maximum value of the first focal length, γ satisfies: 0.55≤|γ|≤0.86; for example, γ can be -0.850, -0.560, -0.629, etc. With this setting, when the current lens group G0 performs image stabilization, the MTF loss of the optical lens 10 can be reduced; at the same time, it is beneficial to reduce the size of the optical lens 10 when it is in telephoto mode.

[0285] The third power distribution ratio γ and αβ of the optical lens 10 will be explained below. The process of deriving the relationship between them.

[0286] The focusing stroke compression ratio of optical lens 10 in short focal length mode is ξ. s The focusing stroke compression ratio of optical lens 10 in short focal length mode is ξ. l .

[0287] So:

[0288] After sorting, we can conclude that:

[0289] Therefore, the third optical power allocation ratio of the optical lens 10 in the short focal length state is:

[0290] The third power distribution ratio of the optical lens 10 in telephoto mode is:

[0291] The third power distribution ratio of the optical lens 10 in any state is:

[0292] Right now:

[0293] The following details the minimum focusing distance U of optical lens 10 when it is in telephoto mode. 01min ′ and its range of values; and also provides a detailed explanation of the relation. The range of values ​​for and the relation Object distance U from the subject 01 The relationship.

[0294] In some embodiments, as shown in Figures 5 and 6, when the optical lens 10 is in a telephoto state, the closest focusing distance U of the optical lens 10 is... 01min ′ Satisfy: U 01min ≥68mm. For example, U 01min The focal lengths can be 261.569mm, 462.245mm, 361.748mm, 266mm, 68mm, 96.5mm, etc. This setting avoids the optical lens 10 having a minimum focusing distance U when in telephoto mode. 01min The smaller the angle, the easier it is to design the optical lens 10, which in turn helps to reduce the design cost of the optical lens 10.

[0295] Among them, the closest focusing distance U 01min ′ refers to the shortest distance at which the optical lens 10 can achieve sharp focus. The shortest distance is the shortest distance from the subject to the object-side surface of the first lens of the optical lens 10. When the optical lens 10 is in telephoto mode, the distance from the subject to the optical lens 10 is greater than or equal to the closest focusing distance U. 01minOnly when the distance between the subject and the optical lens 10 is less than the minimum focusing distance U can the optical lens 10 accurately focus and produce a clear image. 01min At this time, the optical lens 10 cannot focus correctly, resulting in a blurry image.

[0296] In some embodiments, as shown in Figures 5 and 6, when the optical lens 10 is in a telephoto state, the closest focusing distance U of the optical lens 10 is... 01min ′ Satisfy: U 01min ≤465mm. With this setting, the optical lens can capture details of objects at closer distances, thereby improving the image quality at closer distances.

[0297] In some embodiments, as shown in FIG5, when the optical lens 10 is in a telephoto state, the first optical power distribution ratio α, 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 are... g01 The effective focal length f of the second lens group G2 g2 satisfy:

[0298] for example It can be 18.549mm, 27.377mm, 28.608mm, 23.049mm, etc.

[0299] Among them, coefficient

[0300] By relational Setting it to 18mm or greater limits the object distance U at which the optical lens 10 can achieve clear imaging in telephoto mode. 01 The minimum value, i.e., the object distance U 01 The minimum value is 18mm, so the optical lens 10 can achieve closer shooting in telephoto mode. Therefore, the optical lens 10 can capture the details of objects at closer distances, thereby improving the image quality of the optical lens 10 at closer distances.

[0301] What needs to be understood is: U 01 The minimum value (i.e., U) 01min ) and U 01min ′ are two different concepts, the difference being: U 01min It is the minimum distance from the subject to the principal surface of the optical lens 10; U 01min ′ is the shortest distance from the subject to the object-side surface of the first lens of the optical lens 10.

[0302] The following explains the object distance U of the photographed scene when the optical lens 10 is in telephoto mode. 01 and The derivation process of the relationship between them.

[0303] Consider the front lens group G0 and the first lens group G1 in the optical lens 10 as subsystem G01, the second lens group G2 as the moving focusing lens group for internal focusing, and subsystem G01 in a fixed position. When the second lens group G2 moves, the distance d between the image-side principal plane of subsystem G01 and the object-side principal plane of the second lens group G2... 012 Image distance V 012 All of these change, but the image plane position IMA remains unchanged.

[0304] The distance from subsystem G01 to the image plane IMA is defined as TOTR2, and is calculated as follows:

[0305] During the internal focusing process of the second lens group G2, the position of the image plane IMA remains unchanged, therefore:

[0306] The general solution of the above internal focusing differential equation is as follows:

[0307] When the optical lens 10 is in telephoto mode and the object distance of the photographed scene is infinity, the object distance U is... 012 =∞, satisfying:

[0308] therefore:

[0309] The equation is as follows:

[0310] therefore,

[0311] Summarized as follows:

[0312] make:

[0313] but:

[0314] The equation for α can be obtained as follows: α 2 (f g2 +c l d)+(d+c l f g2 )α+f g2 =0;

[0315] Solve the above equation:

[0316] In the above quadratic equation, the condition for solving α is that the following must be satisfied:

[0317] Therefore: Solve for two cases separately. The following is case 1: c l f g2 -d≥2f g2 ;

[0318] Right now:

[0319] After sorting, we can conclude that:

[0320] Right now:

[0321] in,

[0322] The following is scenario 2: c l f g2 -d≤-2f g2 ;

[0323] Right now:

[0324] therefore:

[0325] In order to limit U 01 The minimum value is found, therefore case 2 is discarded, and case 1 is retained; that is... in,

[0326] From the relation Therefore, it can be reasonably set up. The size of U can limit the size of U. 01 The size of the minimum value.

[0327] The following details the maximum optical zoom ratio (Г) of the optical lens 10. max Maximum system zoom ratio Г′ max and its range of values.

[0328] In some embodiments, as shown in Figures 5 and 6, the maximum optical zoom ratio Γ of the optical lens 10 is... max Satisfy: Г max =j1 / j2≤2.1; for example, Г max It can be 1.328, 2.06, 1.702, 1.844, etc.

[0329] Among them, the maximum optical zoom ratio of the optical lens 10 is Γ. maxLet j1 be the maximum ratio of the effective focal length of optical lens 10 in telephoto mode to the maximum effective focal length of optical lens 10 in telephoto mode when focusing on a distant scene (e.g., the object distance of the subject is infinity); j2 is the value of αβ when optical lens 10 is in telephoto mode and focusing on a distant scene; j2 is the value of αβ when optical lens 10 is in telephoto mode and focusing on a distant scene, i.e.:

[0330] By Г max And j1 / j2 are set to Г max =j1 / j2≤2.1, this avoids the maximum optical zoom ratio Г max Too large, if Г max If the size is too large, the overall length of the optical lens 10 will be too long, which is not conducive to the miniaturization design of the optical lens 10. Research has found that when Γ... max When j1 / j2 ≤ 2.1, this can avoid the total length of the optical lens 10 being too long, which can help reduce the volume of the optical lens 10 and facilitate the miniaturization design of the optical lens 10.

[0331] The following explains the maximum zoom ratio Γ of the optical lens 10. max and The derivation process of the relationship between them.

[0332] The optical zoom ratio Γ is defined as: the effective focal length of the optical lens 10 in any state when it is focused on a distant scene (e.g., the object distance of the subject is infinity) and the effective focal length F when it is in a short focal length state. s The ratios are shown below:

[0333] When the optical lens 10 is in a short focal length state, the second optical power allocation ratio and the first optical power allocation ratio are respectively:

[0334] When the optical lens 10 is in any state, the second optical power allocation ratio and the first optical power allocation ratio are respectively:

[0335] Therefore, optical zoom ratio can also be converted into:

[0336] The maximum optical zoom ratio of the optical lens 10 is:

[0337] In some embodiments, as shown in Figures 5 and 6, the maximum system zoom ratio Γ′ of the optical lens 10 is... max Satisfy: Г′ max ≤2.6, for example, Г′ maxThe possible values ​​are 1.516, 2.416, 2.04, 2.295, 2.544, etc. Among these, the maximum system zoom ratio Г′ of the optical lens 10 is... max It is the ratio of the maximum effective focal length to the minimum effective focal length of the optical lens 10.

[0338] By comparing Г′ max Set to Г′ max ≤2.6, this avoids the maximum system zoom ratio Г′ max Too large, if Г′ max If it is too large, the overall length of the optical lens 10 will be too long, which is not conducive to the miniaturization design of the optical lens 10. Research has found that when Г′ max When the length is ≤2.6, the total length of the optical lens 10 can be avoided from being too long, which can help reduce the volume of the optical lens 10 and facilitate the miniaturization design of the optical lens 10.

[0339] The following details the specific composition of the front lens group G0, the first lens group G1, and the second lens group G2 in the optical lens 10.

[0340] In some embodiments, the front lens group G0, the first lens group G1, and the second lens group G2 can be composed of the following optical elements: As shown in Figures 5 and 6, the front lens group G0 includes a positive lens L01 and a negative lens L02 along the object-to-image direction. The first lens group G1 includes a first lens L11, a second lens L12, and a third lens L13 along the object-to-image direction. All three lenses have positive optical power, and there is a gap between adjacent lenses. The second lens group G2 includes a fourth lens L21 and a fifth lens L22, both having negative optical power, along the object-to-image direction. There is a gap between the fourth lens L21 and the fifth lens L22.

[0341] By using a positive and negative combination of optical powers for the lenses in the front lens group G0, the aberrations of the front lens group G0 can be canceled out, thereby further correcting the aberrations of the optical lens 10. Since there are gaps between adjacent lenses in the first lens L11, second lens L12, and third lens L13, and between the fourth lens L21 and fifth lens L22, the number of lens surfaces in the first lens group G1 and the second lens group G2 can be increased, increasing the design freedom of the first lens group G1 and the second lens group G2, which is beneficial for further correcting the aberrations of the optical lens 10.

[0342] In some embodiments, as shown in Figures 5 and 6, the front lens group G0 further includes a first bending element 1, a positive lens L01 disposed on the object side of the first bending element 1, and a negative lens L02 disposed on the image side of the first bending element 1.

[0343] By incorporating a first reversing element 1 in the front lens group G0, the optical path of the optical lens 10 can be reversed, thereby reducing the size of the optical lens 10 along the thickness direction of the electronic device, which in turn helps to reduce the thickness of the electronic device. By placing the positive lens L01 on the object side of the first reversing element 1 and the negative lens L02 on the image side of the first reversing element 1, the positive lens L01 fully utilizes the space on the object side of the first reversing element 1 and avoids occupying the space on the image side of the first reversing element 1, which helps to reduce the size of the optical lens 10 along the optical axis 5.

[0344] In some embodiments, as shown in Figures 5 and 6, the first deflection element 1 is a prism, including a first prism incident surface 11, a first prism exit surface 12, and a first prism reflecting surface 13. The first prism incident surface 11 is disposed facing the object side of the optical lens 10, and the first prism exit surface 12 is disposed facing the side where the first lens group G1 is located. The first prism reflecting surface 13 is used to reflect the light beam entering the first deflection element 1 from the first prism incident surface 11 to the first prism exit surface 12. With this configuration, the positive lens L01 and the negative lens L02 make full use of the thickness of the prism, thereby separating the positive lens L01 and the negative lens L02. This separation can be used to correct aberrations such as field curvature of the optical lens 10, thereby improving the imaging quality of the optical lens 10.

[0345] As shown in Figures 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 flat surface, meaning 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 also a concave surface curved towards the object side, meaning the negative lens L02 is a biconcave negative lens. This configuration makes the positive lens L01, the prism, and the negative lens L02 equivalent to a meniscus lens, which can be used to correct aberrations such as spherical aberration and chromatic aberration of the optical lens 10, thereby improving the imaging quality of the optical lens 10.

[0346] Of course, the positive lens L01 is not limited to a plano-convex lens. The positive lens L01 can also be a biconvex lens, that is, the object-side surface of the positive lens L01 is a convex surface that is curved towards the object side, and the image-side surface of the positive lens L01 is a convex surface that is curved towards the image side.

[0347] As shown in Figures 5 and 6, the positive lens L01 is spaced apart from the incident surface 11 of the first prism, and the negative lens L02 is spaced apart from the exit surface 12 of the first prism.

[0348] In some embodiments, as shown in Figures 5 and 6, the first turning element 1 is a right-angle prism, the angle between the first prism incident surface 11 and the first prism exit surface 12 is a right angle, and the angle between the first prism reflecting surface 13 and the first prism incident surface 11 and the first prism exit surface 12 is an acute angle, such as 45°.

[0349] Of course, the structure of the front lens group G0 is not limited to that shown in Figures 5 and 6. The front lens group G0 can also be configured with other structures according to the actual situation. For example, the front lens group G0 may not include the first turning element 1, and the positive lens L01 and negative lens L02 of the front lens group G0 are arranged along the optical axis 5 of the lens.

[0350] In some embodiments, as shown in FIG5, a spacer ring 33 is provided between adjacent pairs of the first lens L11, the second lens L12 and the third lens L13. A limiting flange 311 is provided at one end of the first fixing cylinder 31, and a pressure ring 34 is provided at the other end. The limiting flange 311 and the pressure ring 34 restrict the first lens group G1 within the first fixing cylinder 31.

[0351] As shown in Figures 5 and 6, the pressure ring 34 is located at the end of the first fixing cylinder 31 closest to the front lens group G0 (left end in the figure), and the limiting flange 311 is located at the end of the first fixing cylinder 31 furthest from the front lens group G0 (right end in the figure). However, this is not a limitation; the positions of the pressure ring 34 and the limiting flange 311 can be interchanged. Furthermore, at least one of the pressure ring 34 and the limiting flange 311 can be replaced with adhesive to achieve lens position fixation.

[0352] In some embodiments, as shown in FIG5, at least one of the first lens L11, the second lens L12, and the third lens L13 is provided with a light-shielding ring 35 at its edge to eliminate stray light at the edge of the first lens group G1. The light-shielding ring 35 may be located at the edge of the second lens L12.

[0353] In some embodiments, as shown in FIG5, a spacer ring 32 is provided between the fourth lens L21 and the fifth lens L22.

[0354] Of course, in addition to passing through the spacer ring 32, the lenses in the first lens group G1 and the second lens group G2 can also be placed in the limiting groove of the fixed cylinder to separate the lenses.

[0355] In some embodiments, as shown in FIG5, at least one of the fourth lens L21 and the fifth lens L22 is provided with a light-shielding ring 35 at its edge to eliminate stray light at the edge of the second lens group G2. For example, the light-shielding ring 35 can be respectively provided at the edges of the fourth lens L21 and the fifth lens L24.

[0356] Figure 8 is a schematic diagram of the optical lens 10 in the second embodiment of this application in a short focal length state, and Figure 9 is a schematic diagram of the optical lens 10 in the second embodiment of this application in a long focal length state. The main difference between the optical lens 10 shown in Figures 8 and 9 and the optical lens 10 shown in Figures 5 and 6 is that the position of the positive lens L01 in the front lens group G0 is different, as described below:

[0357] As shown in Figures 8 and 9, the front lens group G0 includes a first transition element 1, a positive lens L01, and a negative lens L02. Both the positive lens L01 and the negative lens L02 are disposed on the image side of the first transition element 1. The positive lens L01 is disposed between the negative lens L02 and the first transition 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.

[0358] By placing both the positive lens L01 and the negative lens L02 on the image side of the first transition element 1, that is, on the same side of the first transition element 1, there is no need to set a mechanical structure for fixing the lens on the object side of the first transition element 1, thereby simplifying the structure of the optical lens 10 and reducing the cost of the optical lens 10.

[0359] In some embodiments, as shown in Figures 8 and 9, the positive lens L01 and the negative lens L02 are arranged alternately. This arrangement increases the number of lens surfaces in the front lens group G0, increasing the design freedom of the front lens group G0, which is beneficial for correcting aberrations in the optical lens 10.

[0360] Of course, the positive lens L01 and the negative lens L02 can also be cemented together to form a cemented doublet lens. This configuration can correct aberrations such as chromatic aberration in the optical lens 10.

[0361] Figure 10 is a schematic diagram of the optical lens 10 in the third embodiment of this application in a short focal length state. The main difference between the optical lens 10 shown in Figure 10 and the optical lenses 10 shown in Figures 5 and 6 is that the optical lens 10 in Figure 10 has an added second bending element 2, as described below:

[0362] As shown in Figure 10, the optical lens 10 also includes a second deflection element 2. The second deflection element 2 is used to reflect the emitted light beam of the second lens group G2 to one side of the lens optical axis 5. That is, the photosensitive element 20 is disposed on one side of the lens optical axis 5, and the second deflection element 2 is used to reflect the emitted light beam of the second lens group G2 to the photosensitive element 20.

[0363] By setting the second deflection element 2, the optical path of the optical lens 10 can be deflected, thereby reducing the size of the optical lens 10 along the optical axis 5, which in turn reduces the space occupied by the optical lens 10 inside the electronic device. At the same time, it is beneficial to control the size of the photosensitive surface (i.e., the image plane) of the photosensitive element 20 in the direction parallel to the optical axis 5, so the photosensitive surface of the photosensitive element 20 can be designed to be larger, reducing the space occupied by the photosensitive element 20 in the thickness direction of the electronic device.

[0364] In some embodiments, as shown in FIG10, the second deflection element 2 can be a prism, including 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 disposed on the side where the second lens group G2 is located, the second prism exit surface 22 is disposed on the side where the image plane of the optical lens 10 is located, and the second prism reflecting surface 23 is used to reflect the light beam entering the second deflection element 2 from the second prism incident surface 21 to the second prism exit surface 22.

[0365] The material of the second transition element 2 can be a light-transmitting material such as glass or resin, and no specific limitation is made here.

[0366] In some embodiments, as shown in FIG10, 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 angle between the second prism reflecting surface 23 and the second prism incident surface 21 and the second prism exit surface 22 is an acute angle, such as 45°.

[0367] The second turning element 2 is not limited to a prism; in other embodiments, the second turning element 2 may also be a reflector.

[0368] Figure 11 is a schematic diagram of the optical lens 10 in the fourth embodiment of this application in a short focal length state. The main difference between the optical lens 10 shown in Figure 11 and the optical lens 10 shown in Figure 10 is that the type of the first transition element 1 is different, as described below:

[0369] As shown in Figure 11, the first transition element 1 is a reflector. The reflector includes a mirror body and a reflective film covering one side surface of the mirror body. The mirror body can be made of glass, but is not limited to this; other materials are also possible. In some embodiments, the reflective film can be a metal film, such as a silver film, an aluminum film, a gold film, etc.; in other embodiments, the reflective film can also use a high-reflectivity dielectric film layer to achieve ultra-high reflectivity.

[0370] Figure 12a is a schematic diagram of the optical lens 10 in the fifth embodiment of this application in a short focal length state and focusing on a distant object; Figure 12b is a schematic diagram of the optical lens 10 in the fifth embodiment of this application in a short focal length state and focusing on a close-up object; Figure 12c is a schematic diagram of the optical lens 10 in the fifth embodiment of this application in a long focal length state and focusing on a distant object; Figure 12d is a schematic diagram of the optical lens 10 in the fifth embodiment of this application in a long focal length state and focusing on a close-up object. In Figures 12a to 12d, the first transition element 1 (a reflector in this embodiment) is unfolded into an equivalent air layer. The main difference between the optical lens 10 shown in Figures 12a to 12d and the optical lens 10 shown in Figure 11 is that the lens configurations in the first lens group G1 and the second lens group G2 are different, as described below:

[0371] As shown in Figures 12a and 12b, the second lens L12 includes a positive lens L122 and a negative lens L121 spaced apart. The combined optical power of the positive lens L122 and the negative lens L121 is positive. This arrangement is equivalent to splitting the second lens L12 into the positive lens L122 and the negative lens L121, which increases the number of lens surfaces in the first lens group G1, increases the design freedom of the first lens group G1, and thus facilitates the correction of aberrations in the optical lens 10.

[0372] As shown in Figures 12a and 12b, the negative lens L121 is positioned between the positive lens L122 and the first lens L11. However, it is not limited to this; the negative lens L121 can also be positioned between the positive lens L122 and the third lens L13.

[0373] In some embodiments, as shown in Figures 12a and 12b, the fifth lens L22 includes a positive lens L221 and a negative lens L222 spaced apart. The combined optical power of the positive lens L221 and the negative lens L222 is negative. This configuration is equivalent to splitting the fifth lens L22 into a positive lens L221 and a negative lens L222, which increases the number of lens surfaces in the second rear lens group G2, increases the design freedom of the second rear lens group G2, and thus facilitates the correction of aberrations in the optical lens 10.

[0374] As shown in Figures 12a and 12b, the positive lens L221 can be positioned between the fourth lens L21 and the negative lens L222, but it is not limited to this. The negative lens L222 can be positioned between the positive lens L221 and the fourth lens L21.

[0375] As shown in Figures 12a and 12b, when the optical lens 10 is in a short focal length state, the front lens group G0 and the second lens group G2 remain relatively fixed in the direction along the optical axis 5 of the lens, and the first lens group G1 can move along the optical axis 5 of the lens so that the optical lens 10 can switch between focusing on the near scene and focusing on the far scene, that is, to realize the internal focusing of the optical lens 10.

[0376] As shown in Figure 12a, the optical lens 10 is in a state of focusing on a distant object at infinity. As shown in Figure 12b, the optical lens 10 is in a state of focusing on a close-up object at a macro distance, such as 200mm. As shown in Figures 12a and 12b, when the optical lens 10 switches from focusing on a distant object to focusing on a close-up object, the first lens group G1 moves closer to the front lens group G0 (e.g., to the left in Figures 12a and 12b); when the optical lens 10 switches from focusing on a close-up object to focusing on a distant object, the first lens group G1 moves further away from the front lens group G0 (e.g., to the right in Figures 12a and 12b).

[0377] The optical lens 10 shown in Figures 12a, 12b, and 12c will be described in detail below with reference to specific parameters.

[0378] As shown in Tables 1.1 to 1.3, Table 1.1 shows the main parameters of the optical lens 10 in the fifth embodiment of this application when it is in the short focal length state, Table 1.2 shows the main parameters of the optical lens 10 in the fifth embodiment of this application when it is in the long focal length state, and Table 1.3 shows the aspherical coefficients of each surface of the optical element in the optical lens 10 in the fifth embodiment of this application.

[0379] Table 1.1 Main parameters of the optical lens 10 in the fifth embodiment of this application when it is in short focal length mode

[0380] Table 1.2 Main parameters of the optical lens 10 in the telephoto state in the fifth embodiment of this application

[0381] The units for the parameters of radius of curvature, thickness, and light transmission radius in Tables 1.1 and 1.2 are all mm.

[0382] S0 represents the object surface, i.e., the scene being photographed; S1 represents the object-side surface of the positive lens L01, and S2 represents the image-side surface of the positive lens L01. Mirror represents the first reversing element 1, which is a reflecting mirror and has the function of reversing light; S5 represents the object-side surface of the negative lens L02, and S6 represents the image-side surface of the negative lens L02.

[0383] S7 represents the object-side surface of the first lens L11, and S8 represents the image-side surface of the first lens L11. S9 represents the object-side surface of the negative lens L121, and S10 represents the image-side surface of the negative lens L121; S11 represents the object-side surface of the positive lens L122, and S12 represents the image-side surface of the positive lens L122; S13 represents the object-side surface of the third lens L13, and S14 represents the image-side surface of the third lens L13. S15 represents the object-side surface of the fourth lens L21, and S16 represents the image-side surface of the fourth lens L21. S17 represents the object-side surface of the positive lens L221, and S18 represents the image-side surface of the positive lens L221. S19 represents the object-side surface of the negative lens L222, and S20 represents the image-side surface of the negative lens L222.

[0384] PRISM represents the second inflection element 2, which is a prism with light refraction function; S21 represents the second prism incident surface 21 of the second inflection element 23; S22 represents the second prism exit surface 22 of the second inflection element 2; IRCF represents the filter, which is an infrared filter; S23 is the object-side surface of the filter; 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.

[0385] In the table, the surface number S is in the "Thickness" parameter column. n The corresponding numerical value means surface number S n Surface to surface number S n+1 The distance of the surface along the optical axis; the rule for the sign of the thickness parameter is as follows: Starting with S... n The vertex of the surface (the intersection with the optical axis) is the origin for calculation, S n+1 The vertex of the surface is positive if it is on the right and negative if it is on the left. Thickness (INF) represents the thickness of the optical lens 10 when focusing on a distant object (i.e., at infinity); Thickness (Macro) represents the thickness of the optical lens 10 when focusing on a close-up object (i.e., at macro).

[0386] The radii of curvature in the table are the radii of curvature of the corresponding surface number at the optical axis; the rules for the sign of the radii of curvature parameter are as follows: Starting with S... n The vertex of the surface is the origin of the calculation; a right center is positive, and a left center is negative. The radius of curvature of INFINITY indicates that the surface corresponding to this parameter is a plane with an infinite radius of curvature.

[0387] It should be noted that the rules for the plus or minus signs before the thickness parameters and the radius of curvature parameters in this table, as well as the surface number S in the "Thickness" parameter column of the table, are as follows. n The explanations of the corresponding numerical values, thickness (INF), and thickness (Macro) also apply to the tables below.

[0388] As shown in Table 1.2, when using the second lens group G2 to achieve close-up focusing (working distance of 261mm) in telephoto mode, the optical lens 10 needs to move the second lens group G2 1.129mm towards the image side. If the first lens group G1 is used to achieve close-up focusing (working distance of 261mm), the first lens group G1 needs to be moved 1.358mm towards the front lens group G0. 1.358mm is greater than the gap width of 1.095mm between the front lens group G0 and the first lens group G1, and the reserved safety distance is insufficient. Therefore, using the first lens group G1 cannot achieve close-up focusing (working distance of 261mm). In addition, the design of the optical lens 10 needs to consider the safety gap between the lens groups in drop tests. The gap width of 1.095mm between the front lens group G0 and the first lens group G1 is close to the limit of the safety distance between lens groups. Therefore, under the constraint of the safety distance between lens groups, it is difficult to achieve focusing on closer objects by using the first lens group G1 in telephoto mode.

[0389] In some embodiments, the aspherical surfaces in the optical lens 10 can be defined using the following aspherical curve equation:

[0390] Where z is the relative distance between a point on the aspherical surface at a distance r from the optical axis and the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; A i For the i-th order aspherical coefficients, see Table 1.3 for details.

[0391] Table 1.3 Aspherical coefficients of various surfaces of the optical lens 10 in the fifth embodiment of this application

[0392] Table 1.4 Basic parameters of the optical path of the optical lens 10 in the fifth embodiment of this application

[0393] Table 1.5 Relevant parameters and ξ values ​​of the optical lens 10 in the fifth embodiment of this application; where the object distance is INFINITY.

[0394] In Tables 1.4 and 1.5, INF is short for INFINITY, which means the object distance of the photographed scene is infinity; Macro means the object distance of the photographed scene is macro, such as 50mm, 100mm, 200mm, 500mm, etc.

[0395] f L01 f is the focal length of the positive lens L01; L02 f is the focal length of the negative lens L02; L11f is the focal length of the first lens L11. L121 f is the focal length of the negative lens L121. L122 f is the focal length of the positive lens L122. L13 f is the focal length of the third lens L13. L21 f is the focal length of the fourth lens L21. L221 f is the focal length of the positive lens L221. L222 f is the focal length of the negative lens L222; g0 f is the effective focal length of the front lens group G0. g1 f is the effective focal length of the first lens group G1. g2 This is the effective focal length of the second lens group G2.

[0396] F is the effective focal length of optical lens 10 (in any state); F s The effective focal length of the optical lens 10 in its short focal length state; F l The effective focal length of the optical lens 10 when it is in telephoto mode.

[0397] f g01s The focal length f 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 short focal length state. g01l The focal length 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.

[0398] β s β is the second optical power allocation ratio when the optical lens 10 is in a short focal length state. s =f g01s / f g0 ,β l β is the second optical power allocation ratio when the optical lens 10 is in telephoto mode. l =f g01l / f g0 .

[0399] α s α is the first power distribution ratio when the optical lens 10 is in a short focal length state. s =F s / f g01s α l α is the first power distribution ratio of the optical lens 10 when it is in telephoto mode. l =F l / f g01l .

[0400] ξ s ξ is the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in short focal length mode. lmin This is the minimum value of the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in telephoto mode.

[0401] γ s The third power distribution ratio for optical lens 10 when it is in short focal length mode, γ s =F s / f g0 γ l γ is the third power distribution ratio of the optical lens 10 when it is in telephoto mode. l =F l / f g0 .

[0402] As shown in Tables 1.4 and 1.5, when the optical lens 10 is focused on a distant scene and the object distance of the subject is infinity, the effective focal length of the optical lens 10 is 21.44mm in short focal length mode and 28.478mm in long focal length mode, with a maximum optical zoom ratio of 1.328. The maximum effective focal length of the optical lens 10 is 28.478mm, the minimum effective focal length is 18.780mm, and the maximum system zoom ratio is 1.516.

[0403] Specifically, in short focal length mode, the effective focal length of optical lens 10 changes when switching from focusing on a distant object (object distance of infinity) to focusing on a close-up object (object distance of macro). The effective focal length when focusing on a distant object (object distance of infinity) is 1.14 times the effective focal length when focusing on a close-up object (object distance of macro). In long focal length mode, the effective focal length of optical lens 10 when focusing on a distant object (object distance of infinity) is 1.17 times the effective focal length when focusing on a close-up object (object distance of macro).

[0404] As shown in Figures 12a and 12c, when the optical lens 10 is focused on a distant scene and the object distance of the subject is infinite, during the process of switching the optical lens 10 from the short focal length state to the long focal length state, the first lens group G1 moves a distance closer to the front lens group G0 (i.e., the second optical zoom moving distance q2) of 2.785mm, and the second lens group G2 moves a distance closer to the front lens group G0 (i.e., the first optical zoom moving distance Δ2) of 3.388mm.

[0405] As shown in Figures 12a and 12b, during the imaging process of objects at different object distances, when the optical lens 10 is in a short focal length state and switches from focusing on a distant object (object distance is infinite) to focusing on a close object (object distance is macro), the distance the first lens group G1 moves towards the front lens group G0 (i.e., the second focusing moving distance q1) is 2.975mm, which is slightly larger than the second optical zoom moving distance q2 of the first lens group G1.

[0406] As shown in Figures 12c and 12d, during the imaging process of objects at different object distances, when the optical lens 10 is in telephoto mode and switches from focusing on a distant object (object distance is infinite) to focusing on a close-up object (object distance is macro), the distance the second lens group G2 moves away from the front lens group G0 (i.e., the first focusing movement distance Δ1) is 1.129mm. Therefore, during the process of switching from short focal length mode and focusing on a distant object to telephoto mode and focusing on a close-up object, the maximum value of ...

[0407] Figure 12e shows the axial spherical aberration curve of the optical lens 10 in the fifth embodiment of this application when it is in a short focal length state; Figure 12f shows the field curvature and optical distortion curves of the optical lens 10 in the fifth embodiment of this application when it is in a short focal length state; Figure 12g shows the axial spherical aberration curve of the optical lens 10 in the fifth embodiment of this application when it is in a long focal length state; and Figure 12h shows the field curvature and distortion curves of the optical lens 10 in the fifth embodiment of this application when it is in a long focal length state. Figures 12e to 12h show the axial spherical aberration curves, field curvature curves, and distortion curves corresponding to different wavelengths of the system (the illustrations include 650nm, 610nm, 555nm, 510nm, and 470nm).

[0408] The axial spherical aberration curves in the figure illustrate the deviation of light of a corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system; the horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. The deviation values ​​in Figures 12e and 12g are relatively small, indicating good correction of axial spherical aberration in the optical lens.

[0409] The field curvature curves in the figures illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. x represents the beam in the sagittal direction, and y represents the beam in the meridional direction. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the corresponding field of view. When a field value is too large, the image quality of that field is poor or higher-order aberrations exist. The field curvatures in Figures 12f and 12h are both relatively small, indicating that the system has good depth of focus.

[0410] The distortion curves in the figures illustrate the relative deviation between the beam convergence point (actual image height) and the ideal image height for different fields of view. The deviations shown in Figures 12f and 12h are small, ensuring that the image is not significantly distorted.

[0411] Therefore, the optical lens 10 in the fifth embodiment of this application achieves low light aberration control and obtains clear image quality through reasonable surface shape and gap design.

[0412] Figure 12i is a graph showing the relationship between the effective focal length and the focusing stroke compression ratio of the optical lens 10 when the first lens group G1 is used for internal focusing in the fifth embodiment of this application. In Figure 12i, the vertical axis represents the focusing stroke compression ratio, and the horizontal axis represents the effective focal length of the optical lens 10. As shown in Figure 12i, when the optical lens 10 is in a short focal length state and is switching from focusing on a near scene to focusing on a distant scene, the focusing stroke compression ratio increases as the effective focal length of the optical lens 10 increases. The curve showing the relationship between the effective focal length and the focusing stroke compression ratio of the optical lens 10 is approximately a curved curve.

[0413] Figure 12j is a graph showing the relationship between the first optical zoom distance Δ2, the second optical zoom distance q2, and the effective focal length of the optical lens 10 during zooming in the fifth embodiment of this application. In Figure 12j, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the movement distance of the lens groups. The upper curve in Figure 12j represents the relationship between the effective focal length of the optical lens 10 and the first optical zoom distance Δ2, while the lower curve represents the relationship between the effective focal length of the optical lens 10 and the second optical zoom distance q2. As shown in Figure 12j, during zooming, the effective focal length of the optical lens 10 gradually increases as the movement distances of the first lens group G1 and the second lens group G2 increase.

[0414] Figure 12k is a graph showing the relationship between the effective focal length of the optical lens 10 and the first, second, and third optical power allocation ratios during zooming in the fifth embodiment of this application. In Figure 12k, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the optical power allocation ratio. The top curve in Figure 12k represents the relationship between the effective focal length and the first optical power allocation ratio; the middle curve represents the relationship between the effective focal length and the second optical power allocation ratio; and the bottom curve represents the relationship between the effective focal length and the third optical power allocation ratio. As shown in Figure 12k, during zooming, as the effective focal length of the optical lens 10 increases, the first optical power allocation ratio gradually increases, while the second and third optical power allocation ratios gradually decrease.

[0415] Figure 121 is a graph showing the relationship between the second focusing distance q1 of the first lens group G1 and the effective focal length of the optical lens 10 during the internal focusing process in the fifth embodiment of this application. In Figure 121, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the second focusing distance. As shown in Figure 121, when the optical lens 10 is in a short focal length state, during the process of switching from focusing on a distant scene to focusing on a close scene, as the effective focal length of the optical lens 10 decreases (in the figure, along the horizontal axis to the left), the second focusing distance q1 of the first lens group G1 gradually increases.

[0416] Figure 12m is a graph showing the relationship between the first focusing distance Δ1 of the second lens group G2 and the effective focal length of the optical lens 10 during the internal focusing process in the fifth embodiment of this application. In Figure 12m, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the first focusing distance. As shown in Figure 12m, when the optical lens 10 is in telephoto mode, during the process of switching from focusing on a distant scene to focusing on a close scene, as the effective focal length of the optical lens 10 decreases (in the figure, along the horizontal axis to the left), the first focusing distance Δ1 of the second lens group G2 gradually increases.

[0417] Figure 12n is a graph showing the relationship between the focus stroke compression ratio, the minimum value of the focus stroke compression ratio, and the effective focal length of the optical lens 10 during the internal focusing process of the second lens group G2 in the fifth embodiment of this application. When the optical lens 10 is in telephoto mode, as the optical lens 10 switches from focusing on a near scene to focusing on a distant scene, the focus stroke compression ratio gradually decreases and the minimum value of the focus stroke compression ratio gradually increases as the effective focal length of the optical lens 10 increases (in the figure, along the horizontal axis to the right).

[0418] Figure 13a is a schematic diagram of the optical lens 10 in the sixth embodiment of this application in a short focal length state and focusing on a distant scene; Figure 13b is a schematic diagram of the optical lens 10 in the sixth embodiment of this application in a short focal length state and focusing on a close-up scene; Figure 13c is a schematic diagram of the optical lens 10 in the sixth embodiment of this application in a long focal length state and focusing on a distant scene; Figure 13d is a schematic diagram of the optical lens 10 in the sixth embodiment of this application in a long focal length state and focusing on a close-up scene. In Figures 13a to 13d, the first turning element 1 (a prism in this embodiment) is unfolded into an equivalent parallel plate. The main difference between the optical lens 10 shown in Figures 13a to 13d and the optical lens 10 shown in Figures 12a to 12d is that the optical lens 10 shown in Figures 13a to 13d does not have a second turning element 2, the photosensitive element 20 and the filter are arranged along the lens optical axis 5, and the optical power combination of the lenses in the front lens group G0 and the first lens group G1 is different, as detailed below:

[0419] In some embodiments, as shown in FIG13a, the front lens group G0 includes one positive lens L01 and three negative lenses along the object-to-image direction, namely negative lens L02, negative lens L03, and negative lens L04. By using a combination of positive and negative optical powers in the lenses of the front lens group G0, the aberrations of the front lens group G0 can be canceled out, thereby correcting the aberrations of the optical lens 10.

[0420] In some embodiments, as shown in FIG13a, the positive lens L01 is disposed on the object side of the first bending element 1, and the negative lens L02, negative lens L03 and negative lens L04 are disposed on the image side of the first bending element 1.

[0421] By placing the positive lens L01 on the object side of the first transition element 1 and the three negative lenses on the image side of the first transition 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 transition element 1, thereby making the front lens group G0 more compact.

[0422] Of course, the front lens group G0 is not limited to three negative lenses; it can also have four or five negative lenses, depending on the actual situation.

[0423] In some embodiments, as shown in FIG13a, 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 have positive optical power, the second lens L12 has negative optical power, and there is a gap between adjacent pairs of the first lens L11, the second lens L12 and the third lens L13.

[0424] By using a positive-negative-positive combination of optical powers among the lenses in the first lens group G1, the aberrations of the first lens group G1 can be canceled out, thereby correcting the aberrations of the optical lens 10. Furthermore, since there are gaps between adjacent lenses in the first lens L11, second lens L12, and third lens L13, and between the fourth lens L21 and fifth lens L22, the number of lens surfaces in the first lens group G1 and the second lens group G2 can be increased. This increases the design freedom of the first lens group G1 and the second lens group G2, which is beneficial for further correcting the aberrations of the optical lens 10.

[0425] In some embodiments, as shown in FIG13a, the second lens L12 includes two negative lenses, namely negative lens L123 and negative lens L124. This configuration is equivalent to splitting the second lens L12 into negative lens L123 and negative lens L124, which helps to increase the number of lens surfaces in the first lens group G1, increases the design freedom of the first lens group G1, and thus helps to correct the aberrations of the optical lens 10.

[0426] The optical lens 10 shown in Figures 13a to 13d will be described in detail below with reference to specific parameters.

[0427] As shown in Tables 2.1 to 2.3, Table 2.1 shows the main parameters of the optical lens 10 in the sixth embodiment of this application when it is in the short focal length state, Table 2.2 shows the main parameters of the optical lens 10 in the sixth embodiment of this application when it is in the long focal length state; Table 2.3 shows the aspherical coefficients of each surface of the optical element in the optical lens 10 in the sixth embodiment of this application.

[0428] Table 2.1 Main parameters of the optical lens 10 in the sixth embodiment of this application when it is in short focal length mode

[0429] Table 2.2 Main parameters of the optical lens 10 in the telephoto state in the sixth embodiment of this application

[0430] The units for the parameters of radius of curvature, thickness, and light transmission radius in Tables 2.1 and 2.2 are all mm.

[0431] S0 represents the object surface, i.e., the subject of the photograph; S1 represents the object-side surface of the positive lens L011, and S2 represents the image-side surface of the positive lens L011. Prism represents the first prism element 1, which is a prism with the function of refraction of light; S3 represents the first prism incident surface 11 of the first prism element 1, S4 represents the first prism reflecting surface 13 of the first prism element 1, and S5 represents the first prism exit surface 12 of the first prism element 1; S6 represents the object-side surface of the negative lens L02, and S7 represents the image-side surface of the negative lens L02; S8 ​​represents the object-side surface of the negative lens L03, and S9 represents the image-side surface of the negative lens L03; S10 represents the object-side surface of the negative lens L03, and S11 represents the image-side surface of the negative lens L03.

[0432] S12 represents the object-side surface of the first lens L11, and S13 represents the image-side surface of the first lens L11. S14 represents the object-side surface of the negative lens L123, and S15 represents the image-side surface of the negative lens L123. S16 represents the object-side surface of the negative lens L124, and S17 represents the image-side surface of the negative lens L124. S18 represents the object-side surface of the third lens L13, and S19 represents the image-side surface of the third lens L13. S20 represents the object-side surface of the fourth lens L21, and S21 represents the image-side surface of the fourth lens L21. S22 represents the object-side surface of the positive lens L221, and S23 represents the image-side surface of the positive lens L221. S24 represents the object-side surface of the negative lens L222, and S25 represents the image-side surface of the negative lens L222.

[0433] IRCF represents an infrared filter, S26 is the object-side surface of the filter, and S27 is the image-side surface of the filter; IMA represents the image plane, which can be the photosensitive surface of the photosensitive element 20.

[0434] As shown in Table 2.2, when using the second lens group G2 to achieve close-up focusing (working distance of 462mm) in telephoto mode, the optical lens 10 needs to move the second lens group G2 1.436mm towards the image side. If the first lens group G1 is used to achieve close-up focusing (working distance of 462mm), the first lens group G1 needs to be moved 1.339mm towards the front lens group G0. 1.339mm is greater than the gap width of 1.197mm between the front lens group G0 and the first lens group G1, and the reserved safety distance is insufficient. Therefore, using the first lens group G1 cannot achieve close-up focusing (working distance of 462mm). In addition, the design of the optical lens 10 needs to consider the safety gap between the lens groups in drop tests. The gap width of 1.197mm between the front lens group G0 and the first lens group G1 is close to the limit of the safety distance between lens groups. Therefore, under the constraint of the safety distance between lens groups, it is difficult to achieve focusing on closer objects by using the first lens group G1 in telephoto mode.

[0435] Table 2.3 Aspherical coefficients of various surfaces of the optical lens 10 in the sixth embodiment of this application

[0436] Table 2.4 Basic parameters of the optical path of the optical lens 10 in the sixth embodiment of this application

[0437] Table 2.5 Relevant parameters and ξ values ​​of the optical lens 10 in the sixth embodiment of this application; where the object distance is INFINITY.

[0438] In Tables 2.4 and 2.5, INF is short for INFINITY, which means the object distance of the photographed scene is infinity; Macro means the object distance of the photographed scene is macro, such as 50mm, 100mm, 200mm, 500mm, etc.

[0439] f L01 f is the focal length of the positive lens L01; L02 f is the focal length of the negative lens L02; L03 f is the focal length of the negative lens L03; L03 f is the focal length of the negative lens L03; L11 f is the focal length of the first lens L11. L123 f is the focal length of the negative lens L123.L124 f is the focal length of the negative lens L124. L13 f is the focal length of the third lens L13. L21 f is the focal length of the fourth lens L21. L221 f is the focal length of the positive lens L221. L222 f is the focal length of the negative lens L222; g0 f is the effective focal length of the front lens group G0. g1 f is the effective focal length of the first lens group G1. g2 This is the effective focal length of the second lens group G2.

[0440] F is the effective focal length of optical lens 10 (in any state); F s The effective focal length of the optical lens 10 in its short focal length state; F l The effective focal length of the optical lens 10 when it is in telephoto mode.

[0441] f g01s The focal length f 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 short focal length state. g01l The focal length 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.

[0442] β s β is the first power allocation ratio when the optical lens 10 is in a short focal length state. s =f g01s / f g0 ,β l β is the first power distribution ratio when the optical lens 10 is in telephoto mode. l =f g01l / f g0 .

[0443] α s α is the second optical power allocation ratio when the optical lens 10 is in a short focal length state. s =F s / f g01s α l α is the second power distribution ratio when the optical lens 10 is in telephoto mode. l =F l / f g01l .

[0444] ξ s ξ is the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in short focal length mode. lmin This is the minimum value of the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in telephoto mode.

[0445] γ sThe third power distribution ratio for optical lens 10 when it is in short focal length mode, γ s =F s / f g0 γ l γ is the third power distribution ratio of the optical lens 10 when it is in telephoto mode. l =F l / f g0 .

[0446] As shown in Tables 2.4 and 2.5, when the optical lens 10 is focused on a distant scene and the object distance of the subject is infinity, the effective focal length of the optical lens 10 is 20.332mm in short focal length mode and 41.954mm in long focal length mode, with a maximum optical zoom ratio of 2.06. The maximum effective focal length of the optical lens 10 is 41.954mm, the minimum effective focal length is 17.363mm, and the maximum system zoom ratio is 2.416.

[0447] Specifically, in short focal length mode, the effective focal length of optical lens 10 changes when switching from focusing on a distant object (object distance of infinity) to focusing on a close-up object (object distance of macro). The effective focal length when focusing on a distant object (object distance of infinity) is 1.17 times the effective focal length when focusing on a close-up object (object distance of macro). In long focal length mode, the effective focal length of optical lens 10 when focusing on a distant object (object distance of infinity) is 1.15 times the effective focal length when focusing on a close-up object (object distance of macro).

[0448] As shown in Figures 13a and 13c, when the optical lens 10 is focused on a distant scene and the object distance of the subject is infinite, during the process of switching the optical lens 10 from the short focal length state to the long focal length state, the first lens group G1 moves 8.907 mm towards the front lens group G0 (i.e., the second optical zoom moving distance q2), and the second lens group G2 moves 15.344 mm towards the front lens group G0 (i.e., the first optical zoom moving distance Δ2).

[0449] As shown in Figures 13a and 13b, during the imaging process of objects at different object distances, when the optical lens 10 is in a short focal length state and switches from focusing on a distant object (object distance is infinite) to focusing on a close object (object distance is macro), the distance the first lens group G1 moves towards the front lens group G0 (i.e., the second focusing moving distance q1) is 5.112mm, which is less than the second optical zoom moving distance q2 of the first lens group G1.

[0450] As shown in Figures 13c and 13d, during the imaging process of objects at different object distances, when the optical lens 10 is in telephoto mode and switches from focusing on a distant object (object distance is infinite) to focusing on a close-up object (object distance is macro), the second lens group G2 moves away from the front lens group G0 (i.e., the first focusing movement distance Δ1) by 1.436mm. Therefore, during the process of switching from short focal length mode and focusing on a distant object to telephoto mode and focusing on a close-up object, the maximum value of the movement distance q of the first lens group G1 towards the front lens group G0 is 8.907mm, and the maximum value of the movement distance Δ of the second lens group G2 towards the front lens group G0 is 15.344mm.

[0451] Figure 13e shows the axial spherical aberration curve of the optical lens 10 in the sixth embodiment of this application when it is in a short focal length state; Figure 13f shows the field curvature and optical distortion curves of the optical lens 10 in the sixth embodiment of this application when it is in a short focal length state; Figure 13g shows the axial spherical aberration curve of the optical lens 10 in the sixth embodiment of this application when it is in a long focal length state; and Figure 13h shows the field curvature and distortion curves of the optical lens 10 in the sixth embodiment of this application when it is in a long focal length state. Figures 13e to 13h show the axial spherical aberration curves, field curvature curves, and distortion curves corresponding to different wavelengths of the system (the illustrations include 650nm, 610nm, 555nm, 510nm, and 470nm).

[0452] The axial spherical aberration curves in the figure illustrate the deviation of light of a corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system; the horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. The deviation values ​​in Figures 13e and 13g are relatively small, indicating good correction of axial spherical aberration in the optical lens.

[0453] The field curvature curves in the figures illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. x represents the beam in the sagittal direction, and y represents the beam in the meridional direction. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the corresponding field of view. When a field value is too large, the image quality of that field is poor or higher-order aberrations exist. The field curvatures in Figures 13f and 13h are both relatively small, indicating that the system has good depth of focus.

[0454] The distortion curves in the figure are used to illustrate the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. The deviations shown in Figures 13f and 13h are small, which can ensure that there is no obvious distortion in the image.

[0455] Therefore, the optical lens 10 in the sixth embodiment of this application achieves low light aberration control and obtains clear image quality through reasonable surface shape and gap design.

[0456] Figure 13i is a graph showing the relationship between the effective focal length and the focusing stroke compression ratio of the optical lens 10 when the first lens group G1 is used for internal focusing in the sixth embodiment of this application. In Figure 12i, the vertical axis represents the focusing stroke compression ratio, and the horizontal axis represents the effective focal length of the optical lens 10. As shown in Figure 12i, when the optical lens 10 is in a short focal length state and during the process of switching from focusing on the near scene to focusing on the far scene, the focusing stroke compression ratio increases as the effective focal length of the optical lens 10 increases. The curve showing the relationship between the effective focal length and the focusing stroke compression ratio of the optical lens 10 is approximately a curved curve.

[0457] Figure 13j is a graph showing the relationship between the first optical zoom distance Δ2, the second optical zoom distance q2, and the effective focal length of the optical lens 10 during zooming in the sixth embodiment of this application. In Figure 13j, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the movement distance of the lens groups. The upper curve in Figure 13j represents the relationship between the effective focal length of the optical lens 10 and the first optical zoom distance Δ2, while the lower curve represents the relationship between the effective focal length of the optical lens 10 and the second optical zoom distance q2. As shown in Figure 13j, during zooming, the effective focal length of the optical lens 10 gradually increases as the movement distances of the first lens group G1 and the second lens group G2 increase.

[0458] Figure 13k is a graph showing the relationship between the effective focal length of the optical lens 10 and the first, second, and third optical power allocation ratios during zooming in the sixth embodiment of this application. In Figure 13k, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the optical power allocation ratio. The top curve in Figure 13k represents the relationship between the effective focal length and the first optical power allocation ratio; the middle curve represents the relationship between the effective focal length and the second optical power allocation ratio; and the bottom curve represents the relationship between the effective focal length and the third optical power allocation ratio. As shown in Figure 13k, during zooming, as the effective focal length of the optical lens 10 increases, the first optical power allocation ratio gradually increases, while the second and third optical power allocation ratios gradually decrease.

[0459] Figure 131 is a graph showing the relationship between the second focusing distance q1 of the first lens group G1 and the effective focal length of the optical lens 10 during the internal focusing process in the sixth embodiment of this application. In Figure 131, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the second focusing distance. As shown in Figure 131, when the optical lens 10 is in a short focal length state, during the process of switching from focusing on a distant scene to focusing on a close scene, as the effective focal length of the optical lens 10 decreases (in the figure, along the horizontal axis to the left), the second focusing distance q1 of the first lens group G1 gradually increases.

[0460] Figure 13m is a graph showing the relationship between the first focusing distance Δ1 of the second lens group G2 and the effective focal length of the optical lens 10 during the internal focusing process in the sixth embodiment of this application. In Figure 13m, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the first focusing distance. As shown in Figure 13m, when the optical lens 10 is in a telephoto state, during the process of switching from focusing on a distant scene to focusing on a close scene, as the effective focal length of the optical lens 10 decreases (in the figure, along the horizontal axis to the left), the first focusing distance Δ1 of the second lens group G2 gradually increases.

[0461] Figure 13n is a graph showing the relationship between the focus stroke compression ratio, the minimum value of the focus stroke compression ratio, and the effective focal length of the optical lens 10 during the internal focusing process of the second lens group G2 in the sixth embodiment of this application. When the optical lens 10 is in telephoto mode, as the optical lens 10 switches from focusing on a near scene to focusing on a distant scene, the focus stroke compression ratio gradually decreases and the minimum value of the focus stroke compression ratio gradually increases as the effective focal length of the optical lens 10 increases (in the figure, along the horizontal axis to the right).

[0462] Figure 130 shows the focusing process within the second lens group G2 of the optical lens 10 in the extended solution of the sixth embodiment of this application. The main difference between the optical lens 10 in the extended solution of the sixth embodiment of this application and the optical lens 10 shown in the sixth embodiment is: the BFL, gap width δ, first focusing movement distance Δ1, and closest focusing object distance U of the optical lens 10 in the telephoto state. 0min The parameters are different, for example, as shown in Table 2.6:

[0463] Table 2.6 Main parameters of the optical lens 10 in the extended scheme of the sixth embodiment of this application when it is in telephoto mode.

[0464] Figure 13o (7) to (1) shows that during the process of switching the optical lens 10 from focusing on a distant scene (object distance is infinity) to focusing on a close scene (working distance is 68mm), as the second lens group G2 gradually moves away from the front lens group G0, the object distance of the scene focused by the optical lens 10 gradually decreases, and the effective focal length of the optical lens 10 gradually decreases.

[0465] As shown in (7) of Figure 13o, the optical lens 10 is in telephoto mode and is focused on a distant scene (object distance is infinite). At this time, the effective focal length of the optical lens 10 is 41.954mm.

[0466] As shown in (6) of Figure 13o, the optical lens 10 is in telephoto mode and is focused on a close-up object with a working distance of 462.245mm. At this time, the effective focal length of the optical lens 10 is 36.465mm. During the process of the optical lens 10 switching from focusing on a distant object (object distance is infinite) to focusing on a close-up object with a working distance of 462.245mm, the second lens group G2 moves a distance of 1.435mm away from the front lens group G0.

[0467] As shown in (5) of Figure 13o, the optical lens 10 is in telephoto mode and the focusing distance is 300mm for close-up shots. At this time, the effective focal length of the optical lens 10 is 33.868mm. During the process of switching the optical lens 10 from focusing on distant objects (object distance is infinite) to focusing on close-up shots with a focusing distance of 300mm, the second lens group G2 moves a distance of 2.277mm away from the front lens group G0.

[0468] As shown in (4) of Figure 13o, the optical lens 10 is in telephoto mode and the focusing distance is 199mm for close-up. At this time, the effective focal length of the optical lens 10 is 30.594mm. During the process of switching the optical lens 10 from focusing on a distant object (object distance is infinite) to focusing on a close-up object with a focusing distance of 199mm, the second lens group G2 moves a distance of 3.541mm away from the front lens group G0.

[0469] As shown in (3) of Figure 13o, the optical lens 10 is in telephoto mode and the focusing distance is 148mm for close-up. At this time, the effective focal length of the optical lens 10 is 27.690mm. During the process of switching the optical lens 10 from focusing on a distant object (object distance is infinite) to focusing on a close-up object with a focusing distance of 148mm, the second lens group G2 moves a distance of 4.913mm away from the front lens group G0.

[0470] As shown in (2) of Figure 13o, the optical lens 10 is in telephoto mode and the focusing distance is 98mm for close-up. At this time, the effective focal length of the optical lens 10 is 22.667mm. During the process of switching the optical lens 10 from focusing on a distant object (object distance is infinite) to focusing on a close-up object with a focusing distance of 98mm, the second lens group G2 moves a distance of 8.114mm away from the front lens group G0.

[0471] When the optical lens 10 is in telephoto mode and the focusing distance is 88mm for close-up, the effective focal length of the optical lens 10 is 21.226mm. During the process of switching the optical lens 10 from focusing on a distant object (object distance is infinity) to focusing on a close-up at a working distance of 88mm, the second lens group G2 moves a distance of 9.389mm away from the front lens group G0.

[0472] When the optical lens 10 is in telephoto mode and the focusing distance is 83mm for close-up, the effective focal length of the optical lens 10 is 20.340mm. During the process of switching the optical lens 10 from focusing on a distant object (object distance is infinity) to focusing on a close-up at a working distance of 83mm, the second lens group G2 moves 10.217mm away from the front lens group G0.

[0473] When the optical lens 10 is in telephoto mode and the focusing distance is 78mm for close-up, the effective focal length of the optical lens 10 is 19.337mm. During the process of switching the optical lens 10 from focusing on a distant object (object distance is infinity) to focusing on a close-up at a working distance of 78mm, the second lens group G2 moves 11.246mm away from the front lens group G0.

[0474] When the optical lens 10 is in telephoto mode and the focusing distance is 73mm for close-up, the effective focal length of the optical lens 10 is 18.154mm. During the process of switching the optical lens 10 from focusing on a distant object (object distance is infinity) to focusing on a close-up at a working distance of 73mm, the second lens group G2 moves a distance of 12.605mm away from the front lens group G0.

[0475] As shown in (1) of Figure 13o, the optical lens 10 is in telephoto mode and the focusing distance is 68.00mm for close-up. At this time, the effective focal length of the optical lens 10 is 16.490mm. During the process of switching the optical lens 10 from focusing on a distant object (object distance is infinite) to focusing on a close-up with a focusing distance of 68.00mm, the second lens group G2 moves a distance of 14.726mm away from the front lens group G0.

[0476] Figure 14a is a schematic diagram of the optical lens 10 in the seventh embodiment of this application in a short focal length state and focusing on a distant view; Figure 14b is a schematic diagram of the optical lens 10 in the seventh embodiment of this application in a short focal length state and focusing on a close view; Figure 14c is a schematic diagram of the optical lens 10 in the seventh embodiment of this application in a long focal length state and focusing on a distant view; Figure 14d is a schematic diagram of the optical lens 10 in the seventh embodiment of this application in a long focal length state and focusing on a close view. In Figures 14a to 14d, the first turning element 1 (a prism in this embodiment) is unfolded into an equivalent parallel plate.

[0477] The main difference between the optical lenses 10 shown in Figures 14a-14d and those shown in Figures 12a-12d is that the type of the first transition element 1 in the optical lenses 10 shown in Figures 14a-14d is different; the first transition element 1 in the optical lenses 10 shown in Figures 14a-14d is a prism. Furthermore, the optical lenses 10 shown in Figures 14a-14d do not have a second transition element 2, and the photosensitive element 20 and the filter are arranged along the optical axis 5 of the lens, as described below:

[0478] In some embodiments, as shown in FIG14a, the first turning element 1 is a prism, including a first prism incident surface 11 and a first prism exit surface 12. The first prism incident surface 11 is disposed facing the object side of the optical lens 10, and the first prism exit surface 12 is disposed facing the side where the first lens group G1 is located.

[0479] The optical lens 10 shown in Figures 14a, 14b, 14c, and 14d will be described in detail below with reference to specific parameters.

[0480] As shown in Tables 3.1 to 3.3, Table 3.1 shows the main parameters of the optical lens 10 in the seventh embodiment of this application when it is in the short focal length state, Table 3.2 shows the main parameters of the optical lens 10 in the seventh embodiment of this application when it is in the long focal length state, and Table 3.3 shows the aspherical coefficients of each surface of the optical element in the optical lens 10 in the seventh embodiment of this application.

[0481] Table 3.1 Main parameters of the optical lens 10 in the short focal length state in the seventh embodiment of this application

[0482] Table 3.2 Main parameters of the optical lens 10 in the telephoto state in the seventh embodiment of this application

[0483] The units for the parameters of radius of curvature, thickness, and light transmission radius in Tables 3.1 and 3.2 are all mm.

[0484] S0 represents the object surface, i.e., the subject of the photograph; S1 represents the object-side surface of the positive lens L011, and S2 represents the image-side surface of the positive lens L011. Prism represents the first prism element 1, which is a prism with the function of reversing light; S3 represents the first prism incident surface 11 of the prism, and S4 represents the first prism exit surface 12 of the prism. S5 represents the object-side surface of the negative lens L02, and S6 represents the image-side surface of the negative lens L02.

[0485] S7 represents the object-side surface of the first lens L11, and S8 represents the image-side surface of the first lens L11. S9 represents the object-side surface of the negative lens L121, and S10 represents the image-side surface of the negative lens L121; S11 represents the object-side surface of the positive lens L122, and S12 represents the image-side surface of the positive lens L122; S13 represents the object-side surface of the third lens L13, and S14 represents the image-side surface of the third lens L13. S15 represents the object-side surface of the fourth lens L21, and S16 represents the image-side surface of the fourth lens L21. S17 represents the object-side surface of the positive lens L221, and S18 represents the image-side surface of the positive lens L221. S19 represents the object-side surface of the negative lens L222, and S20 represents the image-side surface of the negative lens L222.

[0486] IRCF represents an infrared filter, S21 is the object-side surface of the filter, and S22 is the image-side surface of the filter; IMA represents the image plane, which can be the photosensitive surface of the photosensitive element 20.

[0487] As shown in Table 3.2, when the optical lens 10 uses the second lens group G2 to achieve close-up focusing (working distance of 361.7mm) in telephoto mode, the second lens group G2 needs to be moved 2.074mm towards the image side. If the first lens group G1 is used to achieve close-up focusing (working distance of 361.7mm), the first lens group G1 needs to be moved 2.152mm towards the front lens group G0. 2.152mm is greater than the gap width of 0.919mm between the front lens group G0 and the first lens group G1, and the reserved safety distance is insufficient. Therefore, using the first lens group G1 to move cannot achieve close-up focusing (working distance of 361.7mm). In addition, the design of the optical lens 10 needs to take into account the safety gap between each lens group in the drop test. The gap width between the front lens group G0 and the first lens group G1 is 0.919mm, which is close to the limit of the safety distance between lens groups. Therefore, under the constraint of the safety distance between lens groups, it is difficult to achieve focusing on closer objects by moving the first lens group G1 in the telephoto state.

[0488] Table 3.3 Aspherical coefficients of various surfaces of the optical lens 10 in the seventh embodiment of this application

[0489] Table 3.4 Basic parameters of the optical path of the optical lens 10 in the seventh embodiment of this application

[0490] Table 3.5 Relevant parameters and ξ values ​​of the optical lens 10 in the seventh embodiment of this application; where the object distance is INFINITY.

[0491] In Tables 3.4 and 3.5, INF is short for INFINITY, which means that the object distance of the photographed scene is infinite; Macro means that the object distance of the photographed scene is macro, such as 50mm, 100mm, 200mm, 500mm, etc.

[0492] f L01 f is the focal length of the positive lens L01; L02 f is the focal length of the negative lens L02; L03 f is the focal length of the negative lens L03; L04 This is the focal length of the negative lens L04.

[0493] f L11 f is the focal length of the first lens L11. L121 f is the focal length of the negative lens L123. L122 f is the focal length of the negative lens L124. L13 f is the focal length of the third lens L13. L21 f is the focal length of the fourth lens L21. L221 f is the focal length of the positive lens L221. L222 f is the focal length of the negative lens L222; g0 f is the effective focal length of the front lens group G0. g1 f is the effective focal length of the first lens group G1. g2 This is the effective focal length of the second lens group G2.

[0494] F is the effective focal length of optical lens 10 (in any state); F s The effective focal length of the optical lens 10 in its short focal length state; F l The effective focal length of the optical lens 10 when it is in telephoto mode.

[0495] f g01s The focal length f 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 short focal length state. g01l The focal length 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.

[0496] β s β is the first power allocation ratio when the optical lens 10 is in a short focal length state. s =fg01s / f g0 ,β l β is the first power distribution ratio when the optical lens 10 is in telephoto mode. l =f g01l / f g0 .

[0497] α s α is the second optical power allocation ratio when the optical lens 10 is in a short focal length state. s =F s / f g01s α l α is the second power distribution ratio when the optical lens 10 is in telephoto mode. l =F l / f g01l .

[0498] ξ s ξ is the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in short focal length mode. lmin This is the minimum value of the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in telephoto mode.

[0499] γ s The third power distribution ratio for optical lens 10 when it is in short focal length mode, γ s =F s / f g0 γ l γ is the third power distribution ratio of the optical lens 10 when it is in telephoto mode. l =F l / f g0 .

[0500] As shown in Tables 3.4 and 3.5, when the optical lens 10 is focused on a distant scene and the object distance of the subject is infinity, the effective focal length of the optical lens 10 is 24.001mm in short focal length mode and 40.851mm in long focal length mode, with a maximum optical zoom ratio of 1.702. The maximum effective focal length of the optical lens 10 is 40.851mm, the minimum effective focal length is 20.018mm, and the maximum system zoom ratio is 2.04.

[0501] Specifically, in short focal length mode, the effective focal length of optical lens 10 changes when switching from focusing on a distant object (object distance of infinity) to focusing on a close-up object (object distance of macro). The effective focal length when focusing on a distant object (object distance of infinity) is 1.20 times the effective focal length when focusing on a close-up object (object distance of macro). In long focal length mode, the effective focal length of optical lens 10 when focusing on a distant object (object distance of infinity) is 1.21 times the effective focal length when focusing on a close-up object (object distance of macro).

[0502] As shown in Figures 14a and 14c, when the optical lens 10 is focused on a distant scene and the object distance of the subject is infinite, during the process of switching the optical lens 10 from the short focal length state to the long focal length state, the first lens group G1 moves a distance (i.e., the second optical zoom moving distance q2) closer to the front lens group G0, and the second lens group G2 moves a distance (i.e., the first optical zoom moving distance Δ2) closer to the front lens group G0, which is 10.342mm.

[0503] As shown in Figures 14a and 14b, during the imaging process of objects at different object distances, when the optical lens 10 is in a short focal length state and switches from focusing on a distant object (object distance is infinite) to focusing on a close object (object distance is macro), the distance the first lens group G1 moves towards the front lens group G0 (i.e., the second focusing moving distance q1) is 5.939mm, which is less than the second optical zoom moving distance q2 of the first lens group G1.

[0504] As shown in Figures 14c and 14d, during the imaging process of objects at different object distances, when the optical lens 10 is in telephoto mode and switches from focusing on a distant object (object distance is infinite) to focusing on a close-up object (object distance is macro), the distance the second lens group G2 moves away from the front lens group G0 (i.e., the first focusing movement distance Δ1) is 2.074mm. Therefore, during the process of switching from short focal length mode and focusing on a distant object to telephoto mode and focusing on a close-up object, the maximum value of ...

[0505] Figure 14e shows the axial spherical aberration curve of the optical lens 10 in the seventh embodiment of this application when it is in a short focal length state; Figure 14f shows the field curvature and optical distortion curves of the optical lens 10 in the seventh embodiment of this application when it is in a short focal length state; Figure 14g shows the axial spherical aberration curve of the optical lens 10 in the seventh embodiment of this application when it is in a long focal length state; and Figure 14h shows the field curvature and distortion curves of the optical lens 10 in the seventh embodiment of this application when it is in a long focal length state. Figures 14e to 14h show the axial spherical aberration curves, field curvature curves, and distortion curves corresponding to different wavelengths of the system (the illustrations include 650nm, 610nm, 555nm, 510nm, and 470nm).

[0506] The axial spherical aberration curves in the figure illustrate the deviation of light of a corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system; the horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. The deviation values ​​in Figures 14e and 14g are relatively small, indicating good correction of axial spherical aberration in the optical lens.

[0507] The field curvature curves in the figures illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. x represents the beam in the sagittal direction, and y represents the beam in the meridional direction. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the corresponding field of view. When a field value is too large, the image quality of that field is poor or higher-order aberrations exist. The field curvatures in Figures 14f and 14h are both relatively small, indicating that the system has good depth of focus.

[0508] The distortion curves in the figures illustrate the relative deviation between the beam convergence point (actual image height) and the ideal image height for different fields of view. The deviations shown in Figures 14f and 14h are small, ensuring that the image is not significantly distorted.

[0509] Therefore, the optical lens 10 in the seventh embodiment of this application achieves low light aberration control and obtains clear image quality through reasonable surface shape and gap design.

[0510] Figure 14i is a graph showing the relationship between the effective focal length and the focusing stroke compression ratio of the optical lens 10 when the first lens group G1 is used for internal focusing in the seventh embodiment of this application. In Figure 14i, the vertical axis represents the focusing stroke compression ratio, and the horizontal axis represents the effective focal length of the optical lens 10. As shown in Figure 14i, when the optical lens 10 is in a short focal length state and during the process of switching from focusing on the near scene to focusing on the far scene, the focusing stroke compression ratio increases as the effective focal length of the optical lens 10 increases. The curve showing the relationship between the effective focal length and the focusing stroke compression ratio of the optical lens 10 is approximately a curved curve.

[0511] Figure 14j is a graph showing the relationship between the first optical zoom distance Δ2, the second optical zoom distance q2, and the effective focal length of the optical lens 10 during zooming in the seventh embodiment of this application. In Figure 14j, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the movement distance of the lens groups. The upper curve in Figure 14j represents the relationship between the effective focal length of the optical lens 10 and the first optical zoom distance Δ2, while the lower curve represents the relationship between the effective focal length of the optical lens 10 and the second optical zoom distance q2. As shown in Figure 14j, during zooming, the effective focal length of the optical lens 10 gradually increases as the movement distances of the first lens group G1 and the second lens group G2 increase.

[0512] Figure 14k is a graph showing the relationship between the effective focal length of the optical lens 10 and the first, second, and third optical power allocation ratios during zooming in the seventh embodiment of this application. In Figure 14k, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the optical power allocation ratio. The top curve in Figure 14k represents the relationship between the effective focal length and the first optical power allocation ratio; the middle curve represents the relationship between the effective focal length and the second optical power allocation ratio; and the bottom curve represents the relationship between the effective focal length and the third optical power allocation ratio. As shown in Figure 14k, during zooming, as the effective focal length of the optical lens 10 increases, the first optical power allocation ratio gradually increases, while the second and third optical power allocation ratios gradually decrease.

[0513] Figure 141 is a graph showing the relationship between the second focusing distance q1 of the first lens group G1 and the effective focal length of the optical lens 10 during the internal focusing process in the seventh embodiment of this application. In Figure 141, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the second focusing distance. As shown in Figure 141, when the optical lens 10 is in a short focal length state, during the process of switching from focusing on a distant scene to focusing on a close scene, as the effective focal length of the optical lens 10 decreases (in the figure, along the horizontal axis to the left), the second focusing distance q1 of the first lens group G1 gradually increases.

[0514] Figure 14m is a graph showing the relationship between the first focusing distance Δ1 of the second lens group G2 and the effective focal length of the optical lens 10 during the internal focusing process in the seventh embodiment of this application. In Figure 14m, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the first focusing distance. As shown in Figure 14m, when the optical lens 10 is in telephoto mode, during the process of switching from focusing on a distant scene to focusing on a close scene, as the effective focal length of the optical lens 10 decreases (in the figure, along the horizontal axis to the left), the first focusing distance Δ1 of the second lens group G2 gradually increases.

[0515] Table 3.6 shows the focusing process state diagram within the second lens group G2 of the optical lens 10 in the extended scheme of the seventh embodiment of this application. The main difference between the optical lens 10 in the extended scheme of the seventh embodiment of this application and the optical lens 10 shown in the seventh embodiment is: the BFL, gap width δ, first focusing movement distance Δ1, and closest focusing object distance U of the optical lens 10 in the telephoto state. 0min The parameters are different, for example, as shown in Table 3.6:

[0516] Table 3.6 Main parameters of the optical lens 10 in the telephoto state in the seventh embodiment of this application, extended scheme one.

[0517] In the seventh embodiment, during the process of switching the optical lens 10 from focusing on a distant scene (object distance is infinity) to focusing on a close scene (working distance is 96.5mm), as the second lens group G2 gradually moves away from the front lens group G0, the object distance of the scene focused by the optical lens 10 gradually decreases, and the effective focal length of the optical lens 10 gradually decreases.

[0518] When the optical lens 10 is in telephoto mode and is focused on a distant scene (object distance is infinity), the effective focal length of the optical lens 10 is 40.851mm.

[0519] When the optical lens 10 is in telephoto mode and focusing on a close-up at a working distance of 156.4mm, the effective focal length of the optical lens 10 is 26.639mm. During the process of switching the optical lens 10 from focusing on a distant object (object distance infinity) to focusing on a close-up at a working distance of 156.4mm, the second lens group G2 moves 5.185mm away from the front lens group G0.

[0520] When the optical lens 10 is in telephoto mode and is focusing on a close-up at a working distance of 96.50mm, the effective focal length of the optical lens 10 is 20.329mm. During the process of switching the optical lens 10 from focusing on a distant object (object distance infinity) to focusing on a close-up at a working distance of 96.50mm, the second lens group G2 moves 9.81mm away from the front lens group G0.

[0521] Tables 3.7 to 3.11 show the parameters of the optical lens 10 in the second extension of the seventh embodiment of this application. The main difference between the optical lens 10 in the second extension of the seventh embodiment and the optical lens 10 in the seventh embodiment is that the parameters of the optical lens 10 are different, such as the back focal length BFL, the gap width δ, the first focusing movement distance Δ1, the second focusing movement distance q1, the effective focal length of the optical lens 10, and the closest focusing distance U. 0min The parameters such as the image plane IMA size are different, as shown in Tables 3.7 to 3.11:

[0522] Table 3.7 Main parameters of the optical lens 10 in the short focal length state of the seventh embodiment of this application, extended scheme two.

[0523] Table 3.8 Main parameters of the optical lens 10 in telephoto mode in extension scheme 2 of the seventh embodiment of this application

[0524] Table 3.9 Aspherical coefficients of each surface of the optical lens 10 in the seventh embodiment extension 2 of this application

[0525] Table 3.10 Basic parameters of the optical path of the optical lens 10 in the extended scheme 2 of the seventh embodiment of this application.

[0526] Table 3.11 Relevant parameters and ξ values ​​of the optical lens 10 in the extended scheme 2 of the seventh embodiment of this application; wherein, the object distance is INFINITY.

[0527] Figure 15a is a schematic diagram of the optical lens 10 in the eighth embodiment of this application in a short focal length state and focusing on a distant view; Figure 15b is a schematic diagram of the optical lens 10 in the eighth embodiment of this application in a short focal length state and focusing on a close view; Figure 15c is a schematic diagram of the optical lens 10 in the eighth embodiment of this application in a long focal length state and focusing on a distant view; Figure 15d is a schematic diagram of the optical lens 10 in the eighth embodiment of this application in a long focal length state and focusing on a close view. In Figures 15a to 15d, the first turning element 1 (a prism in this embodiment) is unfolded into an equivalent parallel plate. The main difference between the optical lens 10 shown in Figures 15a to 15d and the optical lens 10 shown in Figures 13a to 13d is that the parameters of the optical lens 10 are different, as described below:

[0528] The optical lens 10 shown in Figures 15a, 15b, 15c, and 15d will be described in detail below with reference to specific parameters.

[0529] As shown in Tables 4.1 to 4.3, Table 4.1 shows the main parameters of the optical lens 10 in the eighth embodiment of this application when it is in the short focal length state, Table 4.2 shows the main parameters of the optical lens 10 in the eighth embodiment of this application when it is in the long focal length state, and Table 4.3 shows the aspherical coefficients of each surface of the optical element in the optical lens 10 in the eighth embodiment of this application.

[0530] Table 4.1 Main parameters of the optical lens 10 in the eighth embodiment of this application when it is in short focal length mode

[0531] Table 4.2 Main parameters of the optical lens 10 in the telephoto state in the eighth embodiment of this application

[0532] The units for the parameters of radius of curvature, thickness, and light transmission radius in Tables 4.1 and 4.2 are all mm.

[0533] S0 represents the object surface, i.e., the subject of the photograph; S1 represents the object-side surface of the positive lens L011, and S2 represents the image-side surface of the positive lens L011. Prism represents the first prism element 1, which is a prism with the function of refraction of light; S3 represents the first prism incident surface 11 of the first prism element 1, S4 represents the first prism reflecting surface 13 of the first prism element 1, and S5 represents the first prism exit surface 12 of the first prism element 1; S6 represents the object-side surface of the negative lens L02, and S7 represents the image-side surface of the negative lens L02; S8 ​​represents the object-side surface of the negative lens L03, and S9 represents the image-side surface of the negative lens L03; S10 represents the object-side surface of the negative lens L03, and S11 represents the image-side surface of the negative lens L03.

[0534] S12 represents the object-side surface of the first lens L11, and S13 represents the image-side surface of the first lens L11. S14 represents the object-side surface of the negative lens L123, and S15 represents the image-side surface of the negative lens L123. S16 represents the object-side surface of the negative lens L124, and S17 represents the image-side surface of the negative lens L124. S18 represents the object-side surface of the third lens L13, and S19 represents the image-side surface of the third lens L13. S20 represents the object-side surface of the fourth lens L21, and S21 represents the image-side surface of the fourth lens L21. S22 represents the object-side surface of the positive lens L221, and S23 represents the image-side surface of the positive lens L221. S24 represents the object-side surface of the negative lens L222, and S25 represents the image-side surface of the negative lens L222.

[0535] IRCF represents an infrared filter, S26 is the object-side surface of the filter, and S27 is the image-side surface of the filter; IMA represents the image plane, which can be the photosensitive surface of the photosensitive element 20.

[0536] As shown in Table 4.2, when using the second lens group G2 to achieve close-up focusing (working distance of 266mm) in telephoto mode, the optical lens 10 needs to move the second lens group G2 1.784mm towards the image side. If the first lens group G1 is used to achieve close-up focusing (working distance of 266mm), the first lens group G1 needs to be moved 1.823mm towards the front lens group G0. 1.823mm is greater than the gap width of 1.008mm between the front lens group G0 and the first lens group G1, and the reserved safety distance is insufficient. Therefore, using the first lens group G1 to move cannot achieve close-up focusing (working distance of 266mm). In addition, the design of the optical lens 10 needs to consider the safety gap between the lens groups in drop tests. The gap width of 1.008mm between the front lens group G0 and the first lens group G1 is close to the limit of the safety distance between lens groups. Therefore, under the constraint of the safety distance between lens groups, it is difficult to achieve focusing on closer objects using the first lens group G1 in telephoto mode.

[0537] Table 4.3 Aspherical coefficients of various surfaces of the optical lens 10 in the eighth embodiment of this application

[0538] Table 4.4 Basic parameters of the optical path of the optical lens 10 in the eighth embodiment of this application

[0539] Table 4.5 Relevant parameters and ξ values ​​of the optical lens 10 in the eighth embodiment of this application; where the object distance is INFINITY.

[0540] In Tables 4.4 and 4.5, INF is short for INFINITY, which means that the object distance of the photographed scene is infinite; Macro means that the object distance of the photographed scene is macro, such as 50mm, 100mm, 200mm, 500mm, etc.

[0541] f L01 f is the focal length of the positive lens L01; L02 f is the focal length of the negative lens L02; L03 f is the focal length of the negative lens L03; L04 This is the focal length of the negative lens L04.

[0542] f L11 f is the focal length of the first lens L11. L123 f is the focal length of the negative lens L123. L124 f is the focal length of the negative lens L124. L13 f is the focal length of the third lens L13. L21 f is the focal length of the fourth lens L21. L221 f is the focal length of the positive lens L221. L222 f is the focal length of the negative lens L222; g0 f is the effective focal length of the front lens group G0. g1 f is the effective focal length of the first lens group G1. g2 This is the effective focal length of the second lens group G2.

[0543] F is the effective focal length of optical lens 10 (in any state); F s The effective focal length of the optical lens 10 in its short focal length state; F l The effective focal length of the optical lens 10 when it is in telephoto mode.

[0544] f g01s The focal length f 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 short focal length state. g01l The focal length 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.

[0545] β s β is the first power allocation ratio when the optical lens 10 is in a short focal length state. s =f g01s / f g0 ,β l β is the first power distribution ratio when the optical lens 10 is in telephoto mode. l =f g01l / f g0 .

[0546] α s α is the second optical power allocation ratio when the optical lens 10 is in a short focal length state. s =F s / f g01s α l α is the second power distribution ratio when the optical lens 10 is in telephoto mode. l =F l / f g01l .

[0547] ξ s ξ is the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in short focal length mode. lmin This is the minimum value of the focusing stroke compression ratio of the first lens group G1 when the optical lens 10 is in telephoto mode.

[0548] γ s The third power distribution ratio for optical lens 10 when it is in short focal length mode, γ s =F s / f g0 γ l γ is the third power distribution ratio of the optical lens 10 when it is in telephoto mode. l =F l / f g0 .

[0549] As shown in Tables 4.4 and 4.5, when the optical lens 10 is focused on a distant scene and the object distance of the subject is infinity, the effective focal length of the optical lens 10 is 19.156mm in short focal length mode and 35.319mm in long focal length mode, with a maximum optical zoom ratio of 1.844. The maximum effective focal length of the optical lens 10 is 35.319mm, the minimum effective focal length is 15.389mm, and the maximum system zoom ratio is 2.295.

[0550] Specifically, in short focal length mode, the effective focal length of optical lens 10 changes when switching from focusing on a distant object (object distance of infinity) to focusing on a close-up object (object distance of macro). The effective focal length when focusing on a distant object (object distance of infinity) is 1.25 times the effective focal length when focusing on a close-up object (object distance of macro). In long focal length mode, the effective focal length of optical lens 10 when focusing on a distant object (object distance of infinity) is 1.22 times the effective focal length when focusing on a close-up object (object distance of macro).

[0551] As shown in Figures 15a and 15c, when the optical lens 10 is focused on a distant scene and the object distance of the subject is infinite, during the process of switching the optical lens 10 from the short focal length state to the long focal length state, the first lens group G1 moves a distance (i.e., the second optical zoom moving distance q2) closer to the front lens group G0, and the second lens group G2 moves a distance (i.e., the first optical zoom moving distance Δ2) closer to the front lens group G0, which is 11.604mm.

[0552] As shown in Figures 15a and 15b, during the imaging process of objects at different object distances, when the optical lens 10 is in a short focal length state and switches from focusing on a distant object (object distance is infinite) to focusing on a close object (object distance is macro), the distance the first lens group G1 moves towards the front lens group G0 (i.e., the second focusing moving distance q1) is 5.512mm, which is less than the second optical zoom moving distance q2 of the first lens group G1.

[0553] As shown in Figures 15c and 15d, during the imaging process of objects at different object distances, when the optical lens 10 is in telephoto mode and switches from focusing on a distant object (object distance is infinite) to focusing on a close-up object (object distance is macro), the second lens group G2 moves away from the front lens group G0 (i.e., the first focusing movement distance Δ1) by 1.784mm. Therefore, during the process of switching from short focal length mode and focusing on a distant object to telephoto mode and focusing on a close-up object, the maximum value of the movement distance q of the first lens group G1 towards the front lens group G0 is 6.902mm, and the maximum value of the movement distance Δ of the second lens group G2 towards the front lens group G0 is 11.604mm.

[0554] Figure 15e shows the axial spherical aberration curve of the optical lens 10 in the eighth embodiment of this application when it is in a short focal length state; Figure 15f shows the field curvature and optical distortion curves of the optical lens 10 in the eighth embodiment of this application when it is in a short focal length state; Figure 15g shows the axial spherical aberration curve of the optical lens 10 in the eighth embodiment of this application when it is in a long focal length state; and Figure 15h shows the field curvature and distortion curves of the optical lens 10 in the eighth embodiment of this application when it is in a long focal length state. Figures 15e to 15h show the axial spherical aberration curves, field curvature curves, and distortion curves corresponding to different wavelengths of the system (the illustrations include 650nm, 610nm, 555nm, 510nm, and 470nm).

[0555] The axial spherical aberration curves in the figure illustrate the deviation of light of a corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system; the horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. The deviation values ​​in Figures 15e and 15g are both small, indicating good correction of axial spherical aberration in the optical lens.

[0556] The field curvature curves in the figures illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. x represents the beam in the sagittal direction, and y represents the beam in the meridional direction. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the corresponding field of view. When a field value is too large, the image quality of that field is poor or higher-order aberrations exist. The field curvatures in Figures 15f and 15h are both relatively small, indicating that the system has good depth of focus.

[0557] The distortion curves in the figures illustrate the relative deviation between the beam convergence point (actual image height) and the ideal image height for different fields of view. The deviations shown in Figures 15f and 15h are small, ensuring that the image is not significantly distorted.

[0558] Therefore, the optical lens 10 in the eighth embodiment of this application achieves low light aberration control and obtains clear image quality through reasonable surface shape and gap design.

[0559] Figure 15i is a graph showing the relationship between the effective focal length and the focusing stroke compression ratio of the optical lens 10 when the first lens group G1 is used for internal focusing in the eighth embodiment of this application. In Figure 15i, the vertical axis represents the focusing stroke compression ratio, and the horizontal axis represents the effective focal length of the optical lens 10. As shown in Figure 15i, when the optical lens 10 is in a short focal length state and during the process of switching from focusing on the near scene to focusing on the far scene, the focusing stroke compression ratio increases as the effective focal length of the optical lens 10 increases. The curve showing the relationship between the effective focal length and the focusing stroke compression ratio of the optical lens 10 is approximately a curved curve.

[0560] Figure 15j is a graph showing the relationship between the first optical zoom distance Δ2, the second optical zoom distance q2, and the effective focal length of the optical lens 10 during zooming in the eighth embodiment of this application. In Figure 15j, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the movement distance of the lens groups. The upper curve in Figure 15j represents the relationship between the effective focal length of the optical lens 10 and the first optical zoom distance Δ2, while the lower curve represents the relationship between the effective focal length of the optical lens 10 and the second optical zoom distance q2. As shown in Figure 15j, during zooming, the effective focal length of the optical lens 10 gradually increases as the movement distances of the first lens group G1 and the second lens group G2 increase.

[0561] Figure 15k is a graph showing the relationship between the effective focal length of the optical lens 10 and the first, second, and third optical power allocation ratios during zooming in the eighth embodiment of this application. In Figure 15k, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the optical power allocation ratio. The top curve in Figure 15k represents the relationship between the effective focal length and the first optical power allocation ratio; the middle curve represents the relationship between the effective focal length and the second optical power allocation ratio; and the bottom curve represents the relationship between the effective focal length and the third optical power allocation ratio. As shown in Figure 15k, during zooming, as the effective focal length of the optical lens 10 increases, the first optical power allocation ratio gradually increases, while the second and third optical power allocation ratios gradually decrease.

[0562] Figure 15l is a graph showing the relationship between the second focusing distance q1 of the first lens group G1 and the effective focal length of the optical lens 10 during the internal focusing process in the eighth embodiment of this application. In Figure 15l, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the second focusing distance. As shown in Figure 15l, when the optical lens 10 is in a short focal length state, during the process of switching from focusing on a distant scene to focusing on a close scene, as the effective focal length of the optical lens 10 decreases (in the figure, along the horizontal axis to the left), the second focusing distance q1 of the first lens group G1 gradually increases.

[0563] Figure 15m is a graph showing the relationship between the first focusing distance Δ1 of the second lens group G2 and the effective focal length of the optical lens 10 during the internal focusing process in the eighth embodiment of this application. In Figure 15m, the horizontal axis represents the effective focal length of the optical lens 10, and the vertical axis represents the first focusing distance. As shown in Figure 15m, when the optical lens 10 is in telephoto mode, during the process of switching from focusing on a distant scene to focusing on a close scene, as the effective focal length of the optical lens 10 decreases (in the figure, along the horizontal axis to the left), the first focusing distance Δ1 of the second lens group G2 gradually increases.

[0564] The main parameters of the optical lens 10 in some embodiments of this application are summarized below:

[0565] Table 5.1 Back focal length (BFL) values ​​of the optical lens 10 in some embodiments of this application in telephoto mode; unit: mm

[0566] Table 5.2 Values ​​of the gap width δ between the second lens group G2 and the first lens group G1 in some embodiments of the optical lens 10 of this application; unit is mm.

[0567] Table 5.3 Values ​​of the first power allocation ratio of the optical lens 10 in some embodiments of this application

[0568] Table 5.4 Values ​​of the second optical power allocation ratio of the optical lens 10 in some embodiments of this application

[0569] Table 5.5 Values ​​of the first optical zoom movement distance Δ2 and the second optical zoom movement distance q2 of the optical lens 10 in some embodiments of this application; wherein, the units of Δ2 and q2 are mm.

[0570] Table 5.6 Values ​​of the first focusing distance Δ1 and the second focusing distance q1 of the optical lens 10 in some embodiments of this application; unit: mm

[0571] Table 5.7 Values ​​of the focusing stroke compression ratio of the optical lens 10 in some embodiments of this application

[0572] Table 5.8 Values ​​of the third power distribution ratio of the optical lens 10 in some embodiments of this application

[0573] Table 5.9 Values ​​of effective focal length, maximum optical zoom ratio, and maximum system zoom ratio of the optical lens 10 in some embodiments of this application; the unit of effective focal length is mm.

[0574] Table 5.10 Relationships of optical lens 10 in some embodiments of this application The value (in mm) and the value of the coefficient k

[0575] Table 5.11 The closest focusing distance U of the optical lens 10 in some embodiments of this application 0min The value of ′ (in mm)

[0576] The types of cross-sectional lines in the accompanying drawings are for distinguishing different components and should not be construed as limiting the materials of the components. The accompanying drawings are for illustrating structural composition and are not shown to scale of the actual product.

[0577] While the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may arise based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0578] In the embodiments of this application, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," "third," "fourth," and "fifth" may explicitly or implicitly include one or more of that feature.

[0579] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0580] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "left," "right," "inner," and "outer," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. "Multiple" refers to at least two.

[0581] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0582] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An optical lens, characterized in that, It includes a front lens group (G0), a first lens group (G1), and a second lens group (G2) arranged along the object-to-image direction; 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; The optical lens 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 move along the lens optical axis (5) respectively, so that the optical lens can switch between a short focal length state and a long focal length state. When the optical lens is in the long focal length state, it has a first focal length, and when the optical lens is in the short focal length state, it has a second focal length. The maximum value of the first focal length is greater than the maximum value of the second focal length. When the optical lens is in the short focal length state, the front lens group (G0) and the second lens group (G2) remain relatively fixed in the direction along the optical axis (5) of the lens, and the first lens group (G1) can move along the optical axis (5) of the lens so that the optical lens can switch between focusing on close-up and focusing on distant objects. When the optical lens is in the telephoto state, the front lens group (G0) and the first lens group (G1) remain relatively fixed in the direction along the optical axis (5) of the lens, and the second lens group (G2) can move along the optical axis (5) of the lens so that the optical lens can switch between focusing on close-up and focusing on distant objects.

2. The optical lens according to claim 1, characterized in that, When the optical lens is in telephoto mode and focusing on a distant scene, the BFL satisfies: BFL≥9.6mm; And / or, when the optical lens is in telephoto mode and focusing on a close-up, the BFL satisfies: BFL≥2.2mm.

3. The optical lens according to claim 1 or 2, characterized in that, The first focusing movement distance Δ1 of the second lens group (G2) satisfies: Δ1≤14.8mm; wherein, the first focusing movement distance Δ1 is: the movement distance of the second lens group (G2) when the optical lens is in telephoto mode, during the process of the optical lens switching from focusing on the distant scene to focusing on the close scene.

4. The optical lens according to any one of claims 1 to 3, characterized in that, When the optical lens is in the telephoto state and focusing on a distant scene, the gap width δ between the second lens group (G2) and the first lens group (G1) satisfies: δ≥0.7mm.

5. The optical lens according to any one of claims 1 to 4, characterized in that, The second focusing movement distance q1 of the first lens group (G1) satisfies: q1≤6.0mm; wherein, the second focusing movement distance q1 is: the movement distance of the first lens group (G1) when the optical lens is in a short focal length state, during the process of the optical lens switching from focusing on a distant scene to focusing on a close scene.

6. The optical lens according to any one of claims 1 to 5, characterized in that, The first optical zoom movement distance Δ2 of the second lens group (G2) satisfies: Δ2=|-nf g2 ≤15.5mm; Wherein, the first optical zoom movement distance Δ2 is: the movement distance of the second lens group (G2) during the process of the optical lens switching from the short focal length state to the long focal length state when the optical lens is focusing on a distant scene; the coefficient n is the difference between the value of α when the optical lens is in the long focal length state and the value of α when the optical lens is in the short focal length state; α = F / f g01 F is the effective focal length of the optical lens, f g01 The combined focal length of the front lens group (G0) and the first lens group (G1); f g2 This is the effective focal length of the second lens group (G2); and / or; The second optical zoom movement distance q2 of the first lens group (G1) satisfies: q2=|mf g1 |≤9.0mm; Wherein, the second optical zoom movement distance q2 is: the movement distance of the first lens group (G1) during the process of the optical lens switching from the short focal length state to the long focal length state when the optical lens is focusing on a distant scene; the coefficient m is: the difference between the value of 1 / β when the optical lens is in the short focal length state and the value of 1 / β when the optical lens is in the long focal length state when the optical lens is focusing on a distant scene; β=f g01 / f g0 f g01 f is the combined focal length of the front lens group (G0) and the first lens group (G1). g0 f is the effective focal length of the front lens group (G0); g1 The effective focal length of the first lens group (G1) is given.

7. The optical lens according to any one of claims 1 to 6, characterized in that, During the process of switching the optical lens from the short focal length state to the long focal length state, the maximum value of the distance that the second lens group (G2) moves toward or away from the front lens group (G0) is less than or equal to 15.5 mm. And / or, during the process of the optical lens switching from the short focal length state to the long focal length state, the maximum value of the distance by which the first lens group (G1) moves toward or away from the front lens group (G0) is less than or equal to 9.0 mm.

8. The optical lens according to any one of claims 1 to 7, characterized in that, When the optical lens is in the telephoto state, the minimum focusing stroke compression ratio ξmin, the first optical power distribution ratio α, the effective focal length F of the optical lens, and the combined focal length f of the front lens group (G0) and the first lens group (G1) are... g01 satisfy: ξmin=|1-α 2 |≤2.8; among others,α=F / f g01 。 9. The optical lens according to claim 8, characterized in that, When the optical lens is focused on a distant scene, and the optical lens is in the telephoto state, and the effective focal length F of the optical lens is the maximum value of the first focal length, the minimum value of the focusing stroke compression ratio ξmin satisfies: 2.3≤ξmin≤2.

8.

10. The optical lens according to any one of claims 1 to 9, characterized in that, When the optical lens is in the short focal length state, the focusing stroke compression ratio ξ, the first optical power allocation ratio α, the second optical power allocation ratio β, the effective focal length F of the optical lens, and the effective focal length f of the front lens group (G0) are... g0 The combined focal length f of the front lens group (G0) and the first lens group (G1) g01 satisfy: ξ=(1-β 2 )a 2 ≤2.4; among them,α=F / f g01 ,β=f g01 / f g0 。 11. The optical lens according to claim 10, characterized in that, When the optical lens is focused on a distant scene, and the optical lens is in the short focal length state, and the effective focal length f of the optical lens is the minimum value of the second focal length, the focusing stroke compression ratio ξ satisfies: 1.1≤ξ≤2.

4.

12. The optical lens according to claim 10 or 11, characterized in that, When the optical lens is focused on a distant scene, and the optical lens is in the short focal length state, and the effective focal length of the optical lens is the minimum value of the second focal length, the third optical power allocation ratio γ, the first optical power allocation ratio α, the second optical power allocation ratio β, and the focusing stroke compression ratio ξ satisfy the following: Where γ=F / f g0 .

13. The optical lens according to any one of claims 1 to 12, characterized in that, The third optical power distribution ratio γ, the effective focal length F of the optical lens, and the effective focal length f of the front lens group (G0) g0 Satisfies: |γ|≤0.86; where γ=F / f g0 .

14. The optical lens according to claim 13, characterized in that, When the optical lens is focused on a distant scene, and the optical lens is in the telephoto state and the effective focal length of the optical lens is the maximum value of the first focal length, γ satisfies: 0.55≤|γ|≤0.

86.

15. The optical lens according to any one of claims 1 to 13, characterized in that, The first optical power allocation ratio α, the effective focal length F of the optical lens, and the combined focal length f of the front lens group (G0) and the first lens group (G1) g01 Satisfies: 1.1 < |α| ≤ 2; where α = F / f g01 .

16. The optical lens according to claim 15, characterized in that, When the optical lens is focused on a distant scene, and the optical lens is in the short focal length state, and the effective focal length of the optical lens is the minimum value of the second focal length, α satisfies: 1.1≤|α|≤1.67; And / or, when the optical lens is focused on a distant scene, when the optical lens is in the telephoto state and the effective focal length of the optical lens is the maximum value of the first focal length, α satisfies: 1.83≤|α|≤1.

94.

17. The optical lens according to any one of claims 1 to 16, characterized in that, The second optical power allocation ratio β, and the effective focal length f of the front lens group (G0) g0 The combined focal length f of the front lens group (G0) and the first lens group (G1) g01 Satisfies: 0.24 ≤ |β| < 1; where β = f g01 / f g0 .

18. The optical lens according to claim 17, characterized in that, When the optical lens is focused on a distant scene, and the optical lens is in the short focal length state, and the effective focal length F of the optical lens is the minimum value of the second focal length, β satisfies: 0.24≤|β|≤0.

39.

19. The optical lens according to any one of claims 1 to 18, characterized in that, When the optical lens is in the telephoto state, the minimum focusing distance U of the optical lens 01min ′ Satisfy: U 01min ≥68mm; and / or; When the optical lens is in the telephoto state, the first power distribution ratio α, the effective focal length F of the optical lens, and the combined focal length f of the front lens group (G0) and the first lens group (G1) are... g01 The effective focal length f of the second lens group (G2) g2 satisfy: Among them, coefficient α=F / f g01 。 20. The optical lens according to any one of claims 1 to 19, characterized in that, The maximum optical zoom ratio Γ of the optical lens max Satisfy: Г max =j1 / j2≤2.1; Wherein, the maximum optical zoom ratio Γ max Let α be the maximum ratio of the effective focal length of the optical lens when it is in the telephoto state to the maximum effective focal length of the optical lens when it is in the short focal length state, when the optical lens is in the telephoto state and focusing on a distant scene; j1 is the value of αβ when the optical lens is in the telephoto state and focusing on a distant scene; j2 is the value of αβ when the optical lens is in the short focal length state and focusing on a distant scene; α = F / f g01 F is the effective focal length of the optical lens, f g01 The combined focal length of the front lens group (G0) and the first lens group (G1); β = f g01 / f g0 f g01 f is the combined focal length of the front lens group (G0) and the first lens group (G1). g0 The effective focal length of the front lens group (G0); and / or; The maximum system zoom ratio Г′ of the optical lens max Satisfy: Г′ max ≤2.6; Wherein, the maximum system zoom ratio Г′ max It is the ratio of the maximum effective focal length to the minimum effective focal length of the optical lens.

21. A camera module, characterized in that, The optical lens (10) includes a photosensitive element (20), a drive motor (40), and any one of claims 1 to 20. The photosensitive element (20) is disposed on the image side of the optical lens (10), and the drive motor (40) is used to drive the first lens group (G1) and the second lens group (G2) to move along the optical axis (5) of the lens.

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

Images