Optical lens, camera module and electronic device

Abstract

Provided in the present application are an optical lens, a camera module and an electronic device. The optical lens comprises a reflector group, a lens group and a folding element, which are sequentially arranged from an object side to an image side. Light rays enter the interior of the reflector group from an incident surface of the reflector group, are reflected at least twice in the interior of the reflector group, and then exit the reflector group, and enter the lens group. After passing through the lens group, the light rays enter the interior of the folding element from an incident surface of the folding element, are reflected at least once in the folding element, and then exit the folding element. By means of the cooperation between the folding element and the reflector group, the total length of the optical path is further increased, thereby further facilitating the implementation of telephoto end shooting of the optical lens. In addition, because the reflector group and the folding element increase the total length of the optical path by means of reflection, the overall physical length and height of the optical lens can be further kept relatively small, and the total track length of the system of the camera module is not prone to obvious increase, thereby facilitating miniaturization of the camera module.

Description

Optical lens, camera module and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202410965573.1, filed on July 17, 2024, entitled "Optical lens, camera module and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of lenses, in particular to an optical lens, a camera module and an electronic device. BACKGROUND

[0003] With the continuous development of portable electronic devices such as mobile phones, users have increasingly high requirements for the shooting performance of the optical lens of the portable electronic device. In order to meet the needs of users to shoot distant objects, long-focus camera modules have become an indispensable part of electronic devices. However, since shooting distant objects requires long-focus camera modules to have a large optical path, the existing long-focus camera modules have a high shoulder height and a large volume, which is not conducive to the miniaturization of the long-focus camera modules. SUMMARY

[0004] The present application provides an optical lens, a camera module and an electronic device that can realize long-focus shooting and miniaturization.

[0005] In a first aspect, the present application provides an optical lens. The optical lens comprises, in order from an object side to an image side, a mirror group, a lens group and a folding element; the mirror group comprises an incident surface and an exit surface, the exit surface of the mirror group is arranged to face the lens group, light enters the inside of the mirror group from the incident surface of the mirror group, and after at least two reflections in the inside of the mirror group, the light exits the mirror group from the exit surface of the mirror group and enters the lens group; the folding element comprises an incident surface and an exit surface, the incident surface of the folding element is arranged to face the lens group, after the light passes through the lens group, the light enters the inside of the folding element from the incident surface of the folding element, and after at least one reflection in the inside of the folding element, the light exits the folding element from the exit surface of the folding element.

[0006] It can be understood that the mirror group can turn the light entering the inside of the optical lens, and the light can undergo at least two reflections in the inside of the mirror group. On the one hand, the total length of the light path is increased, which is conducive to realizing long-focus shooting of the optical lens. On the other hand, the total length of the optical path is increased by reflection, which can reduce the physical length and height of the optical lens, which is conducive to realizing compact arrangement of the optical lens, thereby reducing the height of the optical lens and realizing miniaturization of the optical lens.

[0007] It can be understood that the light rays converged through the lens group are reflected at least once in the folding element, and the folding element can increase the total length of the optical path. Through the cooperation between the folding element and the mirror group, the total length of the optical path is further increased, thereby further facilitating the long focal end shooting of the optical lens. In addition, since the folding element increases the total length of the optical path through reflection, the physical length and height of the optical lens as a whole can be further kept short, and the system optical total length of the camera module is not easily significantly increased, which is conducive to further reducing the height of the optical lens, thereby realizing the miniaturization of the optical lens.

[0008] In a possible implementation, the optical lens satisfies: 0.2 < RBL / EFL < 1.1, where RBL is the back focal length of the mirror group, and EFL is the focal length of the optical lens.

[0009] It can be understood that by limiting the ratio of the back focal length RBL of the mirror group to the focal length EFL of the optical lens to be within the range of 0.2 to 1.1, it is ensured that the mirror group has space for the light rays to be reflected at least twice, and the optical lens has sufficient space to arrange the lens groups, so that the optical lens has a higher magnification, and the super-telephoto shooting performance of the optical lens is better. In particular, when the ratio of the back focal length RBL of the mirror group to the focal length EFL of the optical lens is close to 0.2, the super-telephoto shooting performance of the optical lens is better.

[0010] In a possible implementation, the optical lens satisfies: FOV < 50°, where FOV is the full field of view of the optical lens.

[0011] It can be understood that by limiting the full field of view FOV of the optical lens to be within the range of less than or equal to 50°, the distortion and distortion of the image edge are reduced or avoided, and the full field of view FOV of the optical lens is smaller, the field of view of the optical lens is smaller, and the optical magnification is larger, which can better meet the super-telephoto design of the optical lens.

[0012] In a possible implementation, the optical lens satisfies: LD / LRD > 1.5, where LD is the maximum clear aperture diameter of the region through which the light rays pass the object side surface of the mirror group, and LRD is the maximum clear aperture diameter of the region through which the light rays exit the image side surface of the mirror group.

[0013] It can be understood that by limiting the ratio of the maximum clear aperture diameter LD of the region through which the light rays pass the object side surface of the mirror group to the maximum clear aperture diameter LRD of the region through which the light rays exit the image side surface of the mirror group to be greater than 1.5, the light rays reflected by the mirror group are contracted, the height of the optical lens is reduced, which is conducive to reducing the shoulder height of the optical lens, thereby facilitating the miniaturization of the optical lens.

[0014] In a possible implementation, the lens set includes a first lens, and the first lens is located on an image side of the mirror set; and the optical lens satisfies: LD / RD>1.1, where RD is a maximum light passing diameter of a region through which the light passes the first lens.

[0015] It can be understood that by limiting the ratio of the maximum light passing diameter LD of the region through which the light passes the object side surface of the mirror set to the maximum light passing diameter RD of the region through which the light passes the first lens to be greater than 1.1, the light reflected by the mirror set is contracted, the light is intercepted, and the off-axis aberration is corrected.

[0016] In a possible implementation, the optical lens satisfies: CTR / LD<0.7, where CTR is a thickness of the mirror set.

[0017] It can be understood that by limiting the ratio of the thickness CTR of the mirror set to the maximum light passing diameter LD of the region through which the light passes the object side surface of the mirror set to be less than 0.7, the light reflected by the mirror set is contracted, the height of the optical lens is reduced, the shoulder height of the optical lens is reduced, and the miniaturization of the optical lens is facilitated.

[0018] In a possible implementation, the optical lens satisfies: 0.6<DOR / IH<5, where DOR is a maximum reflection light diameter of a region closest to the object side on which reflection occurs in the mirror set, and IH is an image height of the optical lens.

[0019] It can be understood that by limiting the ratio of the maximum reflection light diameter DOR of the region closest to the object side on which reflection occurs in the mirror set to the image height IH of the optical lens to be in a range from 0.6 to 5, the obstruction of the on-axis light is reduced, the loss of the light is reduced, and the imaging quality of the optical lens is improved.

[0020] In a possible implementation, the folding element satisfies: -1<HP-1.25×IH×tan(PA)<5, where HP is a height of the folding element in a height direction of the optical lens, and PA is an angle of a smallest acute angle inside the folding element.

[0021] It can be understood that by limiting HP-1.25×IH×tan(PA) to be in a range from -1 to 5, the optical path is folded, the volume of the optical lens is reduced, and the miniaturization of the optical lens is facilitated.

[0022] In a possible implementation, the folding element satisfies: Vd>15, where Vd is an Abbe number of the folding element.

[0023] It can be understood that the Abbe number of the folding element is larger, the folding element can have higher light receiving efficiency and transmittance, the light quantity in the optical path can be increased, and thus the brightness and clarity of imaging can be enhanced, the resolution of the optical lens can be enhanced, optical distortion and color distortion can be reduced, and when the optical lens is applied to the camera module and the electronic device, the imaging quality of the camera module and the electronic device is better.

[0024] In a possible implementation, the entrance surface of the mirror group is located on the object side of the mirror group, and the exit surface of the mirror group is located on the image side of the mirror group; after the light enters the mirror group, the first reflection of the light in the mirror group is located on the image side of the second reflection of the light in the mirror group.

[0025] It can be understood that the mirror group can fold the light entering the inside of the optical lens, and the light can be reflected twice inside the mirror group. On the one hand, the total length of the light path is increased, which is conducive to realizing long-focus shooting of the optical lens. On the other hand, the total length of the light path is increased by reflection, which can reduce the physical length and height of the optical lens, is conducive to realizing compact arrangement of the optical lens, and thus is conducive to reducing the height of the optical lens, and further realizing miniaturization of the optical lens.

[0026] In a possible implementation, the mirror group includes a first reflection surface, the first reflection surface of the mirror group is the region closest to the image side on the mirror group where reflection occurs, and the first reflection surface of the mirror group is curved towards the object side.

[0027] It can be understood that the first reflection surface of the mirror group curved towards the object side can contract the light and correct on-axis aberration, thereby improving the imaging quality of the optical lens.

[0028] In a possible implementation, the mirror group includes a second reflection surface, the second reflection surface of the mirror group is the region closest to the object side on the mirror group where reflection occurs, and the second reflection surface of the mirror group is curved towards the object side.

[0029] It can be understood that the second reflection surface of the mirror group curved towards the object side can modulate the imaging field of view and correct off-axis aberration, thereby improving the imaging quality of the optical lens.

[0030] In a possible implementation, the folding element includes oppositely arranged top and bottom surfaces, the top surface of the folding element faces the exit surface of the mirror group, and the entrance surface of the folding element and the exit surface of the folding element are both located on the top surface of the folding element; the folding element further includes a first reflection surface and a second reflection surface, the first reflection surface of the folding element and the second reflection surface of the folding element connect the top surface of the folding element and the bottom surface of the folding element; after the light enters the folding element, the light is reflected on the first reflection surface of the folding element, the top surface of the folding element, and the second reflection surface of the folding element.

[0031] It can be understood that the light can be reflected multiple times on the top surface, the first reflecting surface and the second reflecting surface of the folding element, and the folding element can increase the total length of the optical path. The folding element can be matched with the mirror group, and the total length of the optical path is further increased, thereby further facilitating the shooting at the long focal end of the optical lens. In addition, since the folding element increases the total length of the optical path by reflection, the physical length and height of the optical lens as a whole can be kept short, thereby facilitating the reduction of the height of the optical lens and the miniaturization of the optical lens.

[0032] In a possible implementation, the folding element includes a top surface and a bottom surface arranged oppositely, the entrance surface of the folding element is located on the top surface of the folding element, and the exit surface of the folding element is located on the top surface of the folding element; the folding element further includes a first reflecting surface and a second reflecting surface, the first reflecting surface and the second reflecting surface connect the top surface of the folding element and the bottom surface of the folding element; after the light enters the folding element, the light is reflected on the first reflecting surface of the folding element, the top surface of the folding element, the bottom surface of the folding element and the second reflecting surface of the folding element.

[0033] It can be understood that the light can be reflected multiple times on the top surface, the first reflecting surface and the second reflecting surface of the folding element, and the folding element can increase the total length of the optical path. The folding element can be matched with the mirror group, and the total length of the optical path is further increased, thereby further facilitating the shooting at the long focal end of the optical lens. In addition, since the folding element increases the total length of the optical path by reflection, the physical length and height of the optical lens as a whole can be kept short, thereby facilitating the reduction of the height of the optical lens and the miniaturization of the optical lens.

[0034] In a possible implementation, the folding element includes a first surface, a second surface and a reflecting surface, the first surface of the folding element connects the second surface of the folding element, and the reflecting surface of the folding element connects the first surface of the folding element and the second surface of the folding element, the first surface of the folding element faces the lens group, the entrance surface of the folding element is located on the first surface of the folding element, and the exit surface of the folding element is located on the second surface of the folding element; after the light enters the folding element, the light is reflected on the second surface of the folding element and the reflecting surface of the folding element.

[0035] It can be understood that the light can be reflected multiple times on the top surface, the first reflecting surface and the second reflecting surface of the folding element, and the folding element can increase the total length of the optical path. The folding element can be matched with the mirror group, and the total length of the optical path is further increased, thereby further facilitating the shooting at the long focal end of the optical lens. In addition, since the folding element increases the total length of the optical path by reflection, the physical length and height of the optical lens as a whole can be kept short, thereby facilitating the reduction of the height of the optical lens and the miniaturization of the optical lens.

[0036] In a possible implementation, the folding element includes a first sub-folding element and a second sub-folding element, and the first sub-folding element is fixedly connected to the second sub-folding element. The first sub-folding element includes a first surface, a second surface, and a reflection surface, the first surface of the first sub-folding element is connected to the second surface of the first sub-folding element and the reflection surface of the first sub-folding element, the first surface of the first sub-folding element faces the lens group, and the incident surface of the folding element is located on the first surface of the first sub-folding element. The second sub-folding element includes a first surface, a second surface, and a reflection surface, the second surface of the second sub-folding element is connected to the first surface of the second sub-folding element and the reflection surface of the second sub-folding element, the first surface of the second sub-folding element faces the second surface of the first sub-folding element, and the exit surface of the folding element is located on the second surface of the second sub-folding element. After the light enters the first sub-folding element, the light is reflected on the second surface of the first sub-folding element, the reflection surface of the first sub-folding element, and the first surface of the first sub-folding element, and then exits the first sub-folding element from the second surface of the first sub-folding element and enters the second sub-folding element from the first surface of the second sub-folding element. The light is reflected on the reflection surface of the second sub-folding element and the first surface of the second sub-folding element.

[0037] It can be understood that the light can be reflected multiple times on the first surface of the first sub-folding element, the second surface of the first sub-folding element, the reflection surface of the first sub-folding element, the first surface of the second sub-folding element, and the reflection surface of the second sub-folding element, and the folding element can increase the total length of the optical path. The folding element can cooperate with the mirror group, and the total length of the optical path is further increased, thereby further facilitating the implementation of the long-focus end shooting of the optical lens. In addition, since the folding element increases the total length of the optical path by reflection, the physical length and height of the optical lens as a whole can be kept short, thereby facilitating the reduction of the height of the optical lens and the miniaturization of the optical lens.

[0038] In a possible implementation, the lens group includes a light conversion element and one or more lenses, and the one or more lenses are located on the image side of the light conversion element. The light conversion element is configured to change the optical axis in a first direction to an optical axis in a second direction, and the first direction is different from the second direction. The light conversion element includes an incident surface, an exit surface, and a reflection surface. The incident surface of the light conversion element is connected to the exit surface of the light conversion element, and the reflection surface of the light conversion element is connected to the incident surface of the light conversion element and the exit surface of the light conversion element. The incident surface of the light conversion element faces the exit surface of the mirror group, and the exit surface of the light conversion element faces the one or more lenses. The light reflected by the mirror group enters the inside of the light conversion element from the incident surface of the light conversion element, is reflected on the reflection surface of the light conversion element, and then exits the light conversion element from the exit surface of the light conversion element and enters the one or more lenses.

[0039] It can be understood that the light turning path element changes the optical axis in the first direction to the second direction, which can reduce the height of the optical lens in the first direction, is conducive to reducing the shoulder height of the optical lens, and is conducive to realizing the miniaturization of the optical lens.

[0040] It can be understood that the light turning path element can be matched with the mirror group and the folding element, and the total length of the optical path is further increased, thereby further facilitating the long focal end shooting of the optical lens. In addition, since the light turning path element increases the total length of the optical path by reflection, the physical length and height of the optical lens as a whole can be kept short, which is conducive to reducing the height of the optical lens, thereby realizing the miniaturization of the optical lens.

[0041] In a second aspect, the present application provides an optical lens. The optical lens comprises a mirror group and a lens group arranged in sequence from an object side to an image side, the lens group comprising a first lens and a light turning path element, the first lens being located on the image side of the light turning path element; the mirror group comprises an entrance surface and an exit surface, the light turning path element comprises an entrance surface, an exit surface and a reflection surface, the entrance surface of the light turning path element is connected to the exit surface of the light turning path element, the reflection surface of the light turning path element is connected to the entrance surface of the light turning path element and the exit surface of the light turning path element, and the exit surface of the mirror group is arranged to face the entrance surface of the light turning path element; light rays enter the interior of the mirror group from the entrance surface of the mirror group, are reflected at least twice in the interior of the mirror group, exit the mirror group from the exit surface of the mirror group, enter the light turning path element, are reflected on the reflection surface of the light turning path element, change from a first direction to a second direction, and exit the light turning path element from the exit surface of the light turning path element to enter the first lens, the first direction intersecting the second direction.

[0042] It can be understood that the light turning path element changes the optical axis in the first direction to the second direction, which can reduce the height of the optical lens in the first direction, is conducive to reducing the shoulder height of the optical lens, and is conducive to realizing the miniaturization of the optical lens.

[0043] It can be understood that the light turning path element can be matched with the mirror group and the folding element, and the total length of the optical path is further increased, thereby further facilitating the long focal end shooting of the optical lens. In addition, since the light turning path element increases the total length of the optical path by reflection, the physical length and height of the optical lens as a whole can be kept short, which is conducive to reducing the height of the optical lens, thereby realizing the miniaturization of the optical lens.

[0044] In a possible implementation manner, the optical lens satisfies: 0.2 < RBL / EFL < 1.1, where RBL is the back focal length of the mirror group, and EFL is the focal length of the optical lens.

[0045] It can be understood that by limiting the ratio of the back focal length RBL of the mirror group to the focal length EFL of the optical lens to be within the range of 0.2 to 1.1, it is ensured that the inside of the mirror group has space for light to be reflected at least twice, and the optical lens has sufficient space to arrange the lens groups, so that the optical lens has a higher magnification, and the super-telephoto shooting performance of the optical lens is better. In particular, when the ratio of the back focal length RBL of the mirror group to the focal length EFL of the optical lens is close to 1, the super-telephoto shooting performance of the optical lens is better.

[0046] In a possible implementation, the optical lens satisfies: FOV≤50°, where FOV is the full field of view angle of the optical lens.

[0047] It can be understood that by limiting the full field of view angle FOV of the optical lens to be within the range of less than or equal to 50°, the distortion and distortion of the image edge are reduced or avoided, and the full field of view angle FOV of the optical lens is smaller, the field of view of the optical lens is smaller, and the optical magnification is larger, which can better meet the super-telephoto design of the optical lens.

[0048] In a possible implementation, the optical lens satisfies: LD / RD>1.1, where LD is the maximum light passing diameter of the area through which the light passes the object side of the mirror group, and RD is the maximum light passing diameter of the area through which the light passes the first lens.

[0049] It can be understood that by limiting the ratio of the maximum light passing diameter LD of the area through which the light passes the object side of the mirror group to the maximum light passing diameter RD of the area through which the light passes the first lens to be greater than 1.1, the light reflected by the mirror group is contracted, the light is intercepted, and the off-axis aberration is corrected.

[0050] In a possible implementation, the optical lens satisfies: LD / LRD>1.5, where LRD is the maximum light passing diameter of the area through which the light exits the image side of the mirror group.

[0051] It can be understood that by limiting the ratio of the maximum light passing diameter LD of the area through which the light passes the object side of the mirror group to the maximum light passing diameter LRD of the area through which the light exits the image side of the mirror group to be greater than 1.5, the light reflected by the mirror group is contracted, the height of the optical lens is reduced, which is conducive to reducing the shoulder height of the optical lens, thereby facilitating the miniaturization of the optical lens.

[0052] In a possible implementation, the optical lens satisfies: CTR / LD<0.7, where CTR is the thickness of the mirror group.

[0053] It can be understood that by limiting the ratio of the thickness CTR of the mirror group to the maximum light passing diameter LD of the area of the object side surface of the mirror group through which the light passes to be less than 0.7, the light reflected by the mirror group is contracted, the height of the optical lens is reduced, the shoulder height of the optical lens is reduced, and the miniaturization of the optical lens is facilitated.

[0054] In a possible implementation, the optical lens satisfies: 0.6 < DOR / IH < 5, where DOR is the maximum reflection diameter of the area closest to the object side of the mirror group where the light is reflected, and IH is the image height of the optical lens.

[0055] It can be understood that by limiting the ratio of the maximum reflection diameter DOR of the area closest to the object side of the mirror group where the light is reflected to the image height IH of the optical lens to be within the range of 0.6 to 5, the obstruction of the on-axis light is reduced, the loss of light is reduced, and the imaging quality of the optical lens is improved.

[0056] In a possible implementation, the entrance surface of the mirror group is located on the object side surface of the mirror group, and the exit surface of the mirror group is located on the image side surface of the mirror group; after the light enters the mirror group, the first reflection of the light in the mirror group is located on the image side of the second reflection of the light in the mirror group.

[0057] It can be understood that the mirror group can turn the light entering the inside of the optical lens, and the light can be reflected twice inside the mirror group. On the one hand, the total length of the light path is increased, and the long focal end shooting of the optical lens is facilitated. On the other hand, the total length of the light path is increased by reflection, the physical length and the height of the optical lens are reduced, the compact setting of the optical lens is facilitated, the height of the optical lens is reduced, and the miniaturization of the optical lens is facilitated.

[0058] In a third aspect, the present application provides a camera module. The camera module includes an image sensor and the optical lens described above, and the image sensor is located on the image side of the optical lens.

[0059] It can be understood that the shoulder height of the camera module is small, and the volume is small, and the miniaturization of the camera module is facilitated. In addition, the long focal shooting performance of the camera module is good.

[0060] In a possible implementation, the camera module satisfies: LEL / TTL < 0.6, where TTL is the total system optical length of the camera module.

[0061] It can be understood that, by limiting the distance between the object side of the mirror group and the image side of the last lens of the lens group arranged along the first direction or the ratio of the distance LEL between the object side of the mirror group and the image side of the mirror group to the total length TTL of the system of the camera module in the range less than 0.6, the height of the optical lens and the camera module is reduced, which is beneficial to reduce the shoulder height of the optical lens and the camera module, thereby facilitating the miniaturization of the optical lens and the camera module.

[0062] In a possible implementation, the camera module satisfies: 0.2 < LEL / LH < 0.9, where LEL is the distance between the object side of the mirror group and the image side of the last lens of the lens group arranged along the first direction, or LEL is the distance between the object side of the mirror group and the image side of the mirror group when the lens group is arranged along the second direction, and LH is the height of the camera module, the first direction is the optical axis direction of the mirror group, and the second direction is different from the first direction.

[0063] It can be understood that, by limiting the distance between the object side of the mirror group and the image side of the last lens of the lens group arranged along the first direction or the ratio of the distance LEL between the object side of the mirror group and the image side of the mirror group to the height LEL of the camera module in the range of 0.2 to 0.9, the height of the camera module is reduced, which is beneficial to reduce the shoulder height of the camera module, thereby facilitating the miniaturization of the camera module.

[0064] In a fourth aspect, the present application provides an electronic device. The electronic device includes an image processor and the camera module described above, the image processor is in communication connection with the camera module, and the image processor is configured to acquire image data from the camera module and process the image data.

[0065] It can be understood that the electronic device has a smaller shoulder height and a smaller volume, which is beneficial to realize the miniaturization of the electronic device. In addition, the electronic device has better long-focus shooting performance. BRIEF DESCRIPTION OF DRAWINGS

[0066] FIG. 1A is a structural schematic diagram of an electronic device in an embodiment provided by the present application;

[0067] FIG. 1B is a partial cross-sectional schematic diagram of the electronic device shown in FIG. 1A at A-A line in an embodiment;

[0068] FIG. 2 is a partial structure simplified schematic diagram of the camera module shown in FIG. 1B in an embodiment;

[0069] FIG. 3 is a simulation effect diagram one of the long-focus end of the camera module in the first embodiment;

[0070] Figure 4 is a simulation effect diagram two of the telephoto end of the camera module of the first embodiment;

[0071] Figure 5 is a simulation effect diagram three of the telephoto end of the camera module of the first embodiment;

[0072] Figure 6 is a simplified schematic diagram one of the partial structure of the camera module shown in Figure IB in another embodiment;

[0073] Figure 7 is a simulation effect diagram one of the telephoto end of the camera module of the second embodiment;

[0074] Figure 8 is a simulation effect diagram two of the telephoto end of the camera module of the second embodiment;

[0075] Figure 9 is a simulation effect diagram three of the telephoto end of the camera module of the second embodiment;

[0076] Figure 10 is a simplified schematic diagram two of the partial structure of the camera module shown in Figure IB in another embodiment;

[0077] Figure 11 is a simulation effect diagram one of the telephoto end of the camera module of the third embodiment;

[0078] Figure 12 is a simulation effect diagram two of the telephoto end of the camera module of the third embodiment;

[0079] Figure 13 is a simulation effect diagram three of the telephoto end of the camera module of the third embodiment;

[0080] Figure 14 is a simplified schematic diagram three of the partial structure of the camera module shown in Figure IB in another embodiment;

[0081] Figure 15 is a simulation effect diagram one of the telephoto end of the camera module of the fourth embodiment;

[0082] Figure 16 is a simulation effect diagram two of the telephoto end of the camera module of the fourth embodiment;

[0083] Figure 17 is a simulation effect diagram three of the telephoto end of the camera module of the fourth embodiment;

[0084] Figure 18 is a simplified schematic diagram four of the partial structure of the camera module shown in Figure IB in another embodiment;

[0085] Figure 19 is a simulation effect diagram one of the telephoto end of the camera module of the fifth embodiment;

[0086] Figure 20 is a simulation effect diagram two of the telephoto end of the camera module of the fifth embodiment;

[0087] Figure 21 is a simulation effect diagram three of the telephoto end of the camera module of the fifth embodiment;

[0088] Fig. 22 is a simplified schematic diagram of the camera module shown in Fig. IB in another embodiment;

[0089] Fig. 23 is a simulation effect diagram one of the telephoto end of the camera module in a sixth embodiment;

[0090] Fig. 24 is a simulation effect diagram two of the telephoto end of the camera module in a sixth embodiment;

[0091] Fig. 25 is a simulation effect diagram three of the telephoto end of the camera module in a sixth embodiment;

[0092] Fig. 26 is a simplified schematic diagram of the camera module shown in Fig. IB in another embodiment;

[0093] Fig. 27 is a simulation effect diagram one of the telephoto end of the camera module in a seventh embodiment;

[0094] Fig. 28 is a simulation effect diagram two of the telephoto end of the camera module in a seventh embodiment;

[0095] Fig. 29 is a simulation effect diagram three of the telephoto end of the camera module in a seventh embodiment. DETAILED DESCRIPTION

[0096] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0097] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms “mounting”, “connecting”, “joint” should be understood broadly, for example, “connecting” can be detachable connection, or can be non-detachable connection; can be direct connection, or can be indirect connection through intermediate medium; can be electrical connection, or can be mechanical connection. Among them, “fixed connection” refers to the relative position relationship after being connected to each other does not change.

[0098] The orientation terms mentioned in the embodiments of the present application, such as “inner”, “outer” and the like, are only the direction of the drawings, therefore, the orientation terms used are for better and clearer illustration and understanding of the embodiments of the present application, and are not indicative or implied that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the embodiments of the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0099] The terms "first", "second", and the like in the description and in the claims of the present application are used for distinguishing between similar objects and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the use of such terms as "first", "second", and the like, is arbitrary and is merely intended to distinguish between two distinct classes of objects that are otherwise identical. It is also to be understood that the use of "first", "second", and the like, is not a requirement based on the relative importance of the objects so designated, but is simply used to distinguish the two distinct classes of objects. It is further understood that the use of "first", "second", and the like, is interchangeable with "one", "two", and the like, unless otherwise specified. Furthermore, the description and the claims can use the term "and / or" to include combinations of elements, unless otherwise specified. The term "and / or" is used to indicate that the use of one or more of the elements is sufficient, unless otherwise specified. The term "multiple" is used to indicate at least two, unless otherwise specified.

[0100] To facilitate the understanding of the optical lens and camera module provided by the embodiments of the present application, the related terms involved in the present application are explained as follows:

[0101] Optical axis is an axis passing through the center of each lens.

[0102] The side of the lens on which the object is located is referred to as the object side, and the surface of the lens close to the object side is referred to as the object side surface.

[0103] The side of the lens on which the image of the object is located is referred to as the image side, and the surface of the lens close to the image side is referred to as the image side surface.

[0104] Focal length, also referred to as focus length, is a measure of the convergence or divergence of light in an optical system, and refers to the vertical distance from the optical center of the lens or optical component to the focal plane when an object at infinity is imaged clearly by the lens or optical component. From a practical point of view, the focal length can be understood as the distance from the center of the lens to the imaging plane. For a fixed-focus lens, the position of the optical center is fixed.

[0105] Effect focal length (EFL) of an optical lens refers to the distance from the center of the optical lens to the focal point.

[0106] Rear back focal length (RBL) of a mirror group refers to the distance from the image side surface of the mirror group to the back focal point (i.e., the image focal plane).

[0107] Lens element length (LEL) of an optical lens refers to the physical length of a single optical lens or lens element. This length usually refers to the thickness of the lens measured along the optical axis, i.e., the distance from the object side surface to the image side surface of the lens.

[0108] Lens Height (LH) of the camera module, defined as the height of the camera module in the first direction, wherein the first direction is the optical axis direction of the mirror group.

[0109] Lens Diameter (LD) of the mirror group, defined as the maximum diameter of the area through which light passes the object side of the mirror group, usually the effective diameter of the object side of the mirror group.

[0110] Radius Diameter (RD) of the optical lens, defined as the maximum diameter of the area through which light passes the lens, usually the effective diameter of the lens.

[0111] Total Track Length (TTL) of the system, defined as the distance that the central light ray of the central field of view travels between the object side of the lens closest to the object of the camera module and the imaging surface in the direction from the object side to the image side.

[0112] Center Thickness of Reflector (CTR) of the mirror group, defined as the thickness of the mirror of the mirror group in the direction of the optical axis from the object side to the image side.

[0113] Lateral Radius of the Diaphragm (LRD) of the mirror group, defined as the maximum diameter of the area through which light exits the image side of the mirror group, that is, the maximum lateral dimension of the optical surface that can reflect light, usually the effective diameter of the exit surface of the mirror group.

[0114] Diameter of Reflector (DOR) of the concave reflecting area of the object side of the mirror group, defined as the maximum reflecting diameter of the area closest to the object side that reflects light on the mirror group.

[0115] Abbe Number (Vd), that is, 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.

[0116] Height of the Prism (HP) of the folding element, defined as the vertical height of the light folding element from the bottom to the top. The light folding element is an optical device used to change the optical path, commonly used in compact optical systems to reduce the physical length of the system. The light folding element can be a mirror, a folding element or other components that can change the path of the light beam. For a simple plane mirror, this height is one of the side lengths of the mirror. For complex folding elements or other folding structures, this height can be the maximum distance along the optical axis.

[0117] Prism Angle (PA), defined as the angle of the smallest acute angle inside the prism element. This angle determines the angle by which the light beam is deflected after passing through the element.

[0118] Imaging Height (IH), representing half of the diagonal length of the active pixel area on the image sensor, i.e., the radius of the imaging circle.

[0119] Telescopic end, the longest focal length section of the lens, i.e., the telephoto end, with the smallest field of view, used for shooting distant scenes, especially close-up shots.

[0120] F-number (Fno), a relative value (the reciprocal of the relative aperture) derived from the focal length of the lens / the entrance pupil diameter of the lens. The smaller the F-number, the more light enters in the same unit of time. The larger the F-number, the smaller the aperture, the larger the depth of field, and the less obvious the blurring effect of the shot.

[0121] Full field of view (FOV), in optical instruments, the angle formed by the two edges of the largest range of the object image that can pass through the lens with the lens as the vertex. The size of the full field of view determines the field of view of the optical instrument. The larger the full field of view, the larger the field of view, and the smaller the optical magnification.

[0122] Longitudinal Spherical Aberration (LSA), also known as longitudinal chromatic aberration or positional chromatic aberration or axial aberration, is a common aberration in optical systems. It describes the phenomenon that light from different areas of a lens or mirror is not focused on the same plane after refraction or reflection, resulting in image blurring. Specifically, longitudinal spherical aberration refers to the deviation of image points along the optical axis, so that light rays of different incident angles converge at different positions, i.e., light rays from different areas do not converge at the same focal point, but form a series of focal points along the optical axis, so that the image planes of different colors do not coincide, and the dispersion of complex color light occurs.

[0123] Astigmatism, due to the fact that the object point is not on the optical axis of the optical system, the light beam emitted by it has an inclination angle with the optical axis. After refraction by the lens, the convergence points of the meridional pencil and the sagittal pencil are not on the same point. That is, the light beam cannot be focused on a point, and the image is not clear, so astigmatism occurs. Meridional pencil and sagittal pencil are the names of light beams in two perpendicular planes in a rotationally symmetric optical system.

[0124] Astigmatic Field Curves, in optical systems, describe the change in focal plane position due to astigmatism. Astigmatism is a common optical aberration that causes light rays passing through an optical system to focus at different positions in the vertical and horizontal directions, resulting in two different focal planes in the image: one called the Sagittal Plane and the other called the Tangential Plane.

[0125] Meridian Plane, the plane formed by the chief ray (principal ray) of an off-axis object point and the optical axis, is called the Meridian Plane.

[0126] Sagittal Surface, the plane that passes through the chief ray (principal ray) of an off-axis object point and is perpendicular to the Meridian Plane, is called the Sagittal Surface.

[0127] Curvature Of Field, the field curvature is used to indicate the difference in the position of the sharpest image point for off-center field rays and the sharpest image point for the center field after passing through an optical lens group. When a lens has field curvature, the intersection of the entire bundle of rays does not coincide with the ideal image point, although a sharp image point is obtained at each specific point, the entire image plane is a curved surface.

[0128] Distortion, also known as distortion, is the degree of distortion of the image formed by the optical system relative to the object itself. Distortion is due to the influence of the stop spherical aberration, the intersection height of the chief ray of different field of view after passing through the optical system is not equal to the ideal image height, and the difference between the two is the distortion. Therefore, distortion only changes the imaging position of off-axis object points on the ideal surface, causing the shape of the image to be distorted, but does not affect the sharpness of the image.

[0129] FIG. 1A is a structural schematic diagram of an electronic device 1000 in an embodiment provided by the present application.

[0130] As shown in FIG. 1A, in some embodiments, the electronic device 1000 can be a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a camera, a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, augmented reality (AR) glasses, an AR helmet, virtual reality (VR) glasses or a VR helmet, or other devices with photographing and video recording functions. The electronic device 1000 in the embodiment shown in FIG. 1A is exemplified by taking a mobile phone as an example.

[0131] FIG. IB is a schematic diagram of a partial cross-sectional view of the electronic device 1000 along line A-A shown in FIG. 1A.

[0132] As shown in FIG. IB, and in conjunction with FIG. 1A, the electronic device 1000 includes a screen 100, a housing 200, a camera module 300, an image processor 400, and an analog-to-digital converter 500. In other embodiments, the electronic device 1000 can include more or fewer structures, for example, the electronic device 1000 can include a circuit board (not shown in the drawings) when the electronic device 1000 includes more structures. When the electronic device 1000 includes fewer structures, the electronic device 1000 can not include the screen 100. It can be understood that FIGS. 1A and IB only schematically show some components included in the electronic device 1000, and the actual shape, actual size, actual position, and actual structure of the components are not limited by FIGS. 1A and IB.

[0133] For example, the screen 100 can be fixed to the housing 200, and the screen 100 can be used to display images to meet the use requirements of a user. The display layer can be a liquid crystal display screen, or an organic light-emitting diode display screen, etc. The screen 100 can be cooperated with the housing 200 to enclose an interior of the electronic device 1000. The interior of the electronic device 1000 can be used to place devices of the electronic device 1000, such as a battery, a receiver, or a microphone, etc. The screen 100 can be a flat screen, or a curved screen.

[0134] It can be understood that hereinafter, in order to facilitate description, the electronic device 1000 is defined to have a first direction, a second direction, and a third direction. The first direction can be a thickness direction of the electronic device 1000, the second direction can be a length direction of the electronic device 1000, the second direction is perpendicular to the first direction, and the third direction can intersect the first direction and the second direction. In other embodiments, the coordinate system of the electronic device 1000 can be flexibly set according to specific actual needs.

[0135] For example, the camera module 300 can be installed in the housing 200, and an incident light side of the camera module 300 can be arranged to face away from the screen 100 to serve as a rear camera of the electronic device 1000.

[0136] Exemplarily, the shell 200 can have a light-transmitting portion 201, which is not limited to a circular shape as shown in FIG. 1A, but can also be an elliptical shape or an irregular shape. The light-transmitting portion 201 connects the inside of the electronic device 1000 to the outside of the electronic device 1000. Light outside the electronic device 1000 can enter the inside of the electronic device 1000 through the light-transmitting portion 201, and dust and water can be prevented. The camera module 300 can collect light outside the electronic device 1000 through the light-transmitting portion 201 to realize the shooting of a picture or a video.

[0137] In other embodiments, the light-entering side of the camera module 300 can be directed to the side where the screen 100 is located, as a front-facing camera of the electronic device 1000. Both the front-facing camera and the rear-facing camera can be used for self-shooting, or for a photographer to shoot other objects.

[0138] It can be understood that the installation position of the camera module 300 of the electronic device 1000 in the embodiment shown in FIG. 1A is only illustrative, and the application does not strictly limit the installation position of the camera module 300. In some other embodiments, the camera module 300 can also be installed at other positions of the electronic device 1000, for example, the camera module 300 can be installed at the upper middle or upper right corner of the back of the electronic device 1000. In some other embodiments, the electronic device 1000 can include a terminal body and an auxiliary component that can rotate, move or detach relative to the terminal body, and the camera module 300 can also be arranged on the auxiliary component.

[0139] Exemplarily, the image processor 400 can be in communication connection with the camera module 300, and the image processor 400 can be used to acquire image data from the camera module 300 and process the image data. The communication connection between the camera module 300 and the image processor 400 can include data transmission through electrical connection such as wiring, or can achieve data transmission through coupling. It can be understood that the camera module 300 and the image processor 400 can also be in communication connection through other ways capable of achieving data transmission.

[0140] The image processor 400 can include a plurality of processing modules, which can convert the original image signal captured by the camera module 300 to form image information, and transmit the processed information to the screen 100 for image or video display through the screen 100. The image processor 400 can be an image processing chip or a digital signal processing chip, which is used to adjust the color of the image, perform noise reduction processing on the image, and further improve the image quality.

[0141] In the embodiments of the present application, the working principle of the camera module 300 in the electronic device 1000 can be that the light reflected by the photographed object enters the inside of the camera module 300, generates an optical image and projects onto the surface of the image sensor of the camera module 300, the image sensor converts the optical image into an electrical signal, i.e., an analog image signal, and transmits the converted analog image signal to the analog-to-digital converter 500, so as to be converted into a digital image signal by the analog-to-digital converter 500 and provided to the image processor 400. The image processor 400 can run to convert the original image signal captured by the camera module 300 to form image information, and transmit the processed information to the display module of the screen 100 for image or video display through the screen 100. In other embodiments, the electronic device 1000 can further include a memory (not shown in the drawings), and the image processor 400 can transmit the image after processing the image digital signal to the memory, so as to be able to find the image from the memory at any time when the image needs to be viewed in the future and display the image on the screen 100.

[0142] FIG. 1A only schematically shows a structural schematic diagram of an electronic device 1000. The size, number and position of the camera module 300, the image processor 400 and the analog-to-digital converter 500 shown in FIG. 1A are only schematically represented, which can be adjusted as needed, and the present application does not limit this.

[0143] It can be understood that the number of the camera module 300 can be one or at least two. When the number of the camera module 300 is one, the camera module 300 can be used as a front camera or a rear camera. When the number of the camera module 300 is at least two, the at least two camera modules 300 can be long-focus camera modules 300, wide-angle camera modules 300 or other camera modules capable of meeting different shooting requirements, and the present application does not limit this.

[0144] As shown in FIG. 1B, the camera module 300 can include an optical lens 10, an image sensor 20 and a filter 30, for example. The light reflected by the photographed object passes through the refraction of the optical lens 10, passes through the filter 30 and is incident on the image sensor 20 to form an image. It can be understood that FIG. 1B and the related drawings below only schematically show some components included in the camera module 300, and the actual shape, actual size, actual position and actual structure of these components are not limited by FIG. 1B and the drawings below. It can be understood that the camera module 300 can further include fewer or more structures. For example, the camera module 300 can include fewer structures, and for example, the camera module 300 can not include the filter 30. The camera module 300 can include more structures, for example, the camera module 300 can further include a lens holder (not shown in the drawings).

[0145] The image sensor 20 can be located on the image side of the optical lens 10. The image sensor 20 is a semiconductor chip, which can also be referred to as a photosensitive chip. The image sensor 20 includes hundreds of thousands to millions of photodiodes on the surface thereof. When the photodiodes are irradiated by light, electric charges are generated. The image sensor 20 converts a light image on the photosensitive surface thereof into an electric signal in a corresponding proportional relationship by using a photoelectric conversion function of a photoelectric device. The photosensitive surface of the image sensor 20 faces the optical lens 10. The image sensor 20 can be a charge-coupled device, a complementary metal-oxide semiconductor, a phototransistor, or a thin-film transistor.

[0146] The camera module 300 can further include a driving member (not shown in the drawings) for driving the lens and / or the image sensor 20 to move to achieve automatic focusing and / or optical image stabilization. The driving member can be a motor, for example, a voice coil motor or a shape memory alloy motor.

[0147] The optical filter 30 can be located between the optical lens 10 and the image sensor 20. Light rays passing through the optical lens 10 are incident on the optical filter 30 and are filtered by the optical filter 30 to form an image on the image sensor 20. The optical filter 30 can be an infrared filter 30. The optical filter 30 can eliminate unnecessary light rays of a waveband from being projected onto the image sensor 20, prevent the image sensor 20 from generating false colors or moiré, and improve the effective resolution and color reproduction of the image sensor 20.

[0148] In some embodiments, the camera module 300 can also cancel the optical filter 30 and instead perform filtering by performing surface treatment or material treatment on at least one optical element of the optical lens 10. The present application does not strictly limit the specific embodiments of the structural member or structure used to achieve filtering.

[0149] The following describes an implementation scheme of the optical lens 10 in the camera module 300 shown in FIG. 1B.

[0150] FIG. 2 is a simplified schematic diagram of part of the structure of the camera module 300 shown in FIG. 1B in an embodiment.

[0151] As shown in FIG. 2, the optical lens 10 includes, in order from the object side to the image side, the mirror group 1, the lens group 2, and the folding element 3. Light rays entering the optical lens 10 can pass through the mirror group 1, the lens group 2, and the folding element 3 in sequence. It can be understood that the first direction can be the optical axis direction of the mirror group 1.

[0152] Exemplarily, the mirror group 1 comprises an entrance surface 1a and an exit surface 1b, the exit surface 1b of the mirror group 1 is arranged to face the lens group 2, the light rays enter the inside of the mirror group 1 through the entrance surface 1a of the mirror group 1, and after at least two reflections in the inside of the mirror group 1, the light rays exit the mirror group 1 through the exit surface 1b of the mirror group 1 and enter the lens group 2.

[0153] It can be understood that the mirror group 1 can turn the light rays entering the inside of the optical lens 10, and the light rays can be reflected at least twice in the inside of the mirror group 1. On the one hand, the total length of the light path is increased, which is beneficial to realize the long-focus end shooting of the optical lens 10. On the other hand, the total length of the light path is increased through reflection, which can reduce the physical length and height of the optical lens 10, which is beneficial to realize the compact arrangement of the optical lens 10, thereby reducing the height of the optical lens 10 and realizing the miniaturization of the optical lens 10.

[0154] As shown in FIG. 2, exemplarily, the mirror group 1 comprises a back-to-back object side surface 1c and an image side surface 1d, the entrance surface 1a of the mirror group 1 can be located on the object side surface 1c of the mirror group 1, and the exit surface 1b of the mirror group 1 can be located on the image side surface 1d of the mirror group 1. After the light rays enter the mirror group 1, the first reflection of the light rays in the mirror group 1 is located on the image side of the second reflection of the light rays in the mirror group 1.

[0155] It can be understood that the mirror group 1 can turn the light rays entering the inside of the optical lens 10, and the light rays can be reflected twice in the inside of the mirror group 1. On the one hand, the total length of the light path is increased, which is beneficial to realize the long-focus end shooting of the optical lens 10. On the other hand, the total length of the light path is increased through reflection, which can reduce the physical length and height of the optical lens 10, which is beneficial to realize the compact arrangement of the optical lens 10, thereby reducing the height of the optical lens 10 and realizing the miniaturization of the optical lens 10.

[0156] In other embodiments, when the mirror group 1 adopts other structures, the light rays can be reflected for the first time and the second time in other regions in the mirror group 1. The specific embodiments of the present application are not limited.

[0157] Some specific but non-limiting examples of the embodiments of the present application will be described in more detail below in combination with the related drawings.

[0158] The first embodiment: as shown in FIG. 2, the mirror group 1 comprises a first reflecting lens 11. Exemplarily, the first reflecting lens 11 can comprise a back-to-back object side surface 11a and an image side surface 11b, the entrance surface 1a of the mirror group 1 can be located on the object side surface 11a of the first reflecting lens 11, and the exit surface 1b of the mirror group 1 can be located on the image side surface 11b of the first reflecting lens 11.

[0159] Exemplarily, the object side surface 11a of the first reflective lens 11 comprises a first sub-region 111 and a second sub-region 112, and the first sub-region 111 can be arranged around the second sub-region 112. The first sub-region 111 can be curved towards the image side. In other words, the middle region of the first sub-region 111 can be convex towards the direction away from the lens group 2. The second sub-region 112 can be curved towards the object side. In other words, the middle region of the second sub-region 112 can be convex towards the direction close to the lens group 2.

[0160] In other embodiments, the first sub-region 111 and the second sub-region 112 of the object side surface 11a of the first reflective lens 11 can adopt other arrangements.

[0161] Exemplarily, the image side surface 11b of the first reflective lens 11 comprises a third sub-region 113 and a fourth sub-region 114, and the third sub-region 113 can be arranged around the fourth sub-region 114. The third sub-region 113 can be curved towards the object side. In other words, the middle region of the third sub-region 113 can be convex towards the direction close to the lens group 2. The fourth sub-region 114 can be curved towards the image side. In other words, the middle region of the third sub-region 113 can be convex towards the direction away from the lens group 2.

[0162] In other embodiments, the third sub-region 113 and the fourth sub-region 114 of the image side surface 11b of the first reflective lens 11 can adopt other arrangements.

[0163] Exemplarily, the exit surface 1b of the mirror group 1 can be located at the fourth sub-region 114 of the image side surface 11b of the first reflective lens 11.

[0164] It can be understood that the light rays reflected inside the mirror group 1 can be emitted from the fourth sub-region 114 of the image side surface 11b of the first reflective lens 11 to the mirror group 1, so that the light rays can propagate smoothly; on the other hand, by designing the maximum light passing diameter of the region through which the light rays pass the fourth sub-region 114 of the image side surface 11b of the first reflective lens 11, the off-axis aberration is corrected, thereby improving the imaging quality of the optical lens 10.

[0165] In other embodiments, the exit surface 1b of the mirror group 1 can also be located at other positions of the image side surface 11b of the first reflective lens 11.

[0166] Exemplarily, after the light rays enter the first reflective lens 11, the first reflection occurs on the third sub-region 113 of the image side surface 11b of the first reflective lens 11, and the second reflection occurs on the second sub-region 112 of the object side surface 11a of the first reflective lens 11.

[0167] It can be understood that the first reflective lens 11 can fold the light rays entering the inside of the optical lens 10, and the light rays can be reflected twice inside the first reflective lens 11. On the one hand, the total length of the light path is increased, which is beneficial to realize the long focal end shooting of the optical lens 10; on the other hand, the total length of the light path is increased by reflection, which can reduce the physical length and height of the optical lens 10, which is beneficial to realize the compact setting of the optical lens 10, thereby reducing the height of the optical lens 10, and realizing the miniaturization of the optical lens 10.

[0168] It can be understood that the second sub-region 112 of the object side surface 11a of the first reflective lens 11 can be the closest reflective surface of the mirror group 1 to the object side. The second sub-region 112 of the object side surface 11a of the first reflective lens 11 can be the second reflective surface 1f of the mirror group 1. The second reflective surface 1f of the mirror group 1 can be curved towards the object side, and the second reflective surface 1f of the mirror group 1 curved towards the object side can modulate the imaging field of view, correct off-axis aberrations, and thus improve the imaging quality of the optical lens 10.

[0169] In other embodiments, when the mirror group 1 adopts other structures, other regions of the mirror group 1 can also be the second reflective surface 1f of the mirror group 1.

[0170] It can be understood that the third sub-region 113 of the image side surface 11b of the first reflective lens 11 can be the closest reflective surface of the mirror group 1 to the image side. The third sub-region 113 of the image side surface 11b of the first reflective lens 11 can be the first reflective surface 1e of the mirror group 1. The first reflective surface 1e of the mirror group 1 can be curved towards the object side, and the first reflective surface 1e of the mirror group 1 curved towards the object side can contract the light rays and correct on-axis aberrations, thereby improving the imaging quality of the optical lens 10.

[0171] In other embodiments, when the mirror group 1 adopts other structures, other regions of the mirror group 1 can also be the first reflective surface 1e of the mirror group 1.

[0172] In other embodiments, the mirror group 1 can also adopt other structures.

[0173] As shown in FIG. 2, for example, the lens group 2 can include at least one lens, for example, two to three lenses, and a plurality of lenses can be arranged along the optical axis direction of the lens group 2.

[0174] As shown in FIG. 2, for example, the cross section of the folding element 3 can be approximately trapezoidal. In other embodiments, the cross section of the folding element 3 can also be parallelogram, triangular or other shapes.

[0175] Exemplarily, the folding element 3 comprises a top surface 31 and a bottom surface 32 arranged oppositely, and the top surface 31 of the folding element 3 can be arranged to face the lens group 2.

[0176] Exemplarily, the folding element 3 comprises an incident surface 33 and an exit surface 34, and the incident surface 33 of the folding element 3 and the exit surface 34 of the folding element 3 can be both located on the top surface 31 of the folding element 3. After passing through the lens group 2, the light rays enter the inside of the folding element 3 through the incident surface 33 of the folding element 3, and are emitted out of the folding element 3 through the exit surface 34 of the folding element 3 after at least one reflection in the folding element 3.

[0177] It can be understood that the light rays converged through the lens group 2 are reflected at least once in the folding element 3, and the folding element 3 can increase the total length of the optical path. Through the cooperation between the folding element 3 and the mirror group 1, the total length of the optical path is further increased, thereby further facilitating the shooting at the telephoto end of the optical lens 10. In addition, since the folding element 3 increases the total length of the optical path through reflection, the overall physical length and height of the optical lens 10 can be further kept short, and the system total length of the camera module 300 is not easily significantly increased, which is conducive to further reducing the height of the optical lens 10, thereby realizing the miniaturized arrangement of the optical lens 10.

[0178] In other embodiments, when the folding element 3 adopts other structures, the incident surface 33 of the folding element 3 and the exit surface 34 of the folding element 3 can also be located on other structures of the folding element 3.

[0179] Exemplarily, the folding element 3 further comprises a first reflecting surface 35 and a second reflecting surface 36, and the first reflecting surface 35 of the folding element 3 and the second reflecting surface 36 of the folding element 3 can connect the top surface 31 of the folding element 3 and the bottom surface 32 of the folding element 3.

[0180] Exemplarily, after the light rays passing through the mirror group 1 and the lens group 2 enter the folding element 3, the light rays are reflected on the first reflecting surface 35 of the folding element 3, the top surface 31 of the folding element 3, and the second reflecting surface 36 of the folding element 3. In an embodiment, the light rays are reflected for the first time on the first reflecting surface 35 of the folding element 3, for the second time on the top surface 31 of the folding element 3, and for the third time on the second reflecting surface 36 of the folding element 3, and then are emitted out of the folding element 3 from the exit surface 34 of the folding element 3, and then reach the image sensor 20 through the optical filter 30 and realize imaging.

[0181] It can be understood that the light can be reflected multiple times on the top surface 31 of the folding element 3, the first reflection surface 35 and the second reflection surface 36, and the folding element 3 can increase the total length of the optical path. The folding element 3 can cooperate with the mirror group 1, and the total length of the optical path is further increased, thereby further facilitating the long focal end shooting of the optical lens 10. In addition, since the folding element 3 increases the total length of the optical path by reflection, the physical length and height of the optical lens 10 as a whole can be kept short, and the system optical total length of the camera module 300 is not easily significantly increased, which is beneficial to reduce the height of the optical lens 10, thereby realizing the miniaturization of the optical lens 10.

[0182] The structure of the related components of the camera module 300 is specifically introduced above. The related optical parameters of the optical lens 10 of the camera module 300 will be specifically introduced below in combination with the drawings, and the meanings of the related optical parameters are indicated in the related drawings.

[0183] Exemplarily, the optical lens 10 can satisfy: 0.2 < RBL / EFL < 1.1, wherein RBL is the back focal length of the mirror group 1, that is, the distance traveled by the light in the process of reaching the image sensor 20 after being emitted from the mirror group 1, and EFL is the focal length of the optical lens 10. For example, RBL / EFL can be equal to 0.21, 0.23, 0.26, 0.28, 0.35, 0.4, 0.45, 0.5, 0.66, 0.72, 0.8, 0.95 or 1.01, etc. It can be understood that by limiting the ratio of the back focal length RBL of the mirror group 1 to the focal length EFL of the optical lens 10 to be within the range of 0.2 to 1.1, it is ensured that the mirror group 1 has a space in which the light can be reflected at least twice, and the optical lens 10 has sufficient space to arrange the lens group 2, so that the optical lens 10 has a relatively high magnification, and the super-telephoto shooting performance of the optical lens 10 is good. In particular, when the ratio of the back focal length RBL of the mirror group 1 to the focal length EFL of the optical lens 10 is close to 0.2, the super-telephoto shooting performance of the optical lens 10 is good.

[0184] In some embodiments, the optical lens 10 can also satisfy: 0.35 < RBL / EFL < 1.1, for example, RBL / EFL can be equal to 0.36, 0.41, 0.53, 0.6, 0.7, 0.88, 0.99 or 1.09, etc. It can be understood that by limiting the ratio of the back focal length RBL of the mirror group 1 to the focal length EFL of the optical lens 10 to be within the range of 0.35 to 1.1, it is ensured that the light can be reflected at least twice in the mirror group 1, and the optical lens 10 has sufficient space to arrange the lens group 2, so that the optical lens 10 has a relatively high magnification, and the super-telephoto shooting performance of the optical lens 10 is good.

[0185] In other embodiments, RBL / EFL can also satisfy other ranges. The application is not limited specifically.

[0186] Exemplarily, the optical lens 10 can satisfy: FOV≤50°, wherein FOV is the full field of view angle of the optical lens 10, for example, FOV can be equal to 5°, 10.6°, 15°, 16.6°, 23°, 28°, 32.7°, 38°, 40°, 45° or 50°, etc. It can be understood that by limiting the full field of view angle FOV of the optical lens 10 in the range of less than or equal to 50°, the distortion and distortion of the image edge are reduced or avoided, and the full field of view angle FOV of the optical lens 10 is smaller, the field of view of the optical lens 10 is smaller, and the optical magnification is larger, which can better satisfy the ultra-long focal design of the optical lens 10.

[0187] In other embodiments, FOV can also satisfy other ranges. The application is not limited specifically.

[0188] Exemplarily, the optical lens 10 can satisfy: 0.2<LEL / LH<0.9, wherein LEL is the distance between the object side 1c of the mirror group 1 and the image side of the last lens arranged along the first direction of the lens group 2 when at least part of the lens group 2 is arranged along the first direction, or LEL can be the distance between the object side 1c of the mirror group 1 and the image side 1d of the mirror group 1 when all of the lens group 2 is arranged along the second direction, and LH is the height of the camera module 300, for example, LEL / LH can be equal to 0.21, 0.25, 0.3, 0.47, 0.51, 0.66, 0.72, 0.8 or 0.89, etc. It can be understood that by limiting the ratio of the distance LEL between the object side 1c of the mirror group 1 and the image side of the last lens arranged along the first direction of the lens group 2 or the distance between the object side 1c of the mirror group 1 and the image side 1d of the mirror group 1 to the height LH of the camera module 300 in the range of 0.2 to 0.9, the height of the camera module 300 is reduced, which is beneficial to reduce the shoulder height of the camera module 300, thereby facilitating the miniaturization of the camera module 300.

[0189] In other embodiments, LEL / LH can also satisfy other ranges. The application is not limited specifically.

[0190] Exemplarily, the optical lens 10 can satisfy: LD / LRD>1.5, where LD is the maximum diameter of the light passing through the area of the object side 1c of the mirror group 1, and LRD is the maximum diameter of the light exiting the area of the image side 1d of the mirror group 1, for example, LD / LRD can be equal to 1.51, 1.6, 1.8, 2.3, 2.5, 3, 5 or 10, etc. It can be understood that by limiting the ratio of the maximum diameter LD of the light passing through the area of the object side 1c of the mirror group 1 to the maximum diameter LRD of the light exiting the area of the image side 1d of the mirror group 1 in the range greater than 1.5, the light reflected by the mirror group 1 is contracted, the height of the optical lens 10 is reduced, which is beneficial to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0191] In other embodiments, LD / LRD can also satisfy other ranges. Specifically, the present application is not limited.

[0192] Exemplarily, the lens group 2 can include a first lens 21, and the object side of the first lens 21 is arranged to face the image side of the mirror group 1. The optical lens 10 can satisfy: LD / RD>1.1, where RD is the maximum diameter of the light passing through the area of the first lens 21, for example, LD / RD can be equal to 1.2, 1.5, 2, 2.5, 2.9, 3, 4, 5 or 5.5, etc. It can be understood that by limiting the ratio of the maximum diameter LD of the light passing through the area of the object side 1c of the mirror group 1 to the maximum diameter RD of the light passing through the area of the first lens 21 in the range greater than 1.1, the light reflected by the mirror group 1 is contracted, the light is intercepted, and the off-axis aberration is corrected.

[0193] In other embodiments, LD / RD can also satisfy other ranges. Specifically, the present application is not limited.

[0194] Exemplarily, the optical lens 10 can satisfy: CTR / LD<0.7, where CTR is the thickness of the mirror group 1 (i.e. the height of the mirror group 1 in the first direction), for example, CTR / LD can be equal to 0.1, 0.22, 0.3, 0.37, 0.4, 0.55, 0.66 or 0.69, etc. It can be understood that by limiting the ratio of the thickness CTR of the mirror group 1 to the maximum diameter LD of the light passing through the area of the object side 1c of the mirror group 1 in the range less than 0.7, the light reflected by the mirror group 1 is contracted, the height of the optical lens 10 is reduced, which is beneficial to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0195] In other embodiments, CTR / LD can also satisfy other ranges. Specifically, the present application is not limited.

[0196] Exemplarily, the optical lens 10 can satisfy: 0.6 < DOR / IH < 5, where DOR is the maximum reflected light diameter of the region closest to the object side where reflection occurs on the mirror group 1, and IH is the image height of the optical lens 10. For example, DOR / IH can be equal to 0.66, 1, 1.6, 2, 2.5, 3, 3.61, 4, or 4.9, etc. It can be understood that by limiting the ratio of the maximum reflected light diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 to the image height IH of the optical lens 10 within the range of 0.6 to 5, the obstruction of the on-axis light is reduced, the loss of light is reduced, and thus the imaging quality of the optical lens 10 is improved.

[0197] In other embodiments, DOR / IH can also satisfy other ranges. The present application is not limited in particular.

[0198] Exemplarily, the camera module 300 can satisfy: LEL / TTL < 0.6, where TTL is the total system optical length of the camera module 300, that is, the total length of the optical path of the central light of the central field of view in the camera module 300. For example, LEL / TTL can be equal to 0.1, 0.23, 0.28, 0.35, 0.4, 0.48, 0.5, or 0.58, etc. It can be understood that by limiting the ratio of the distance between the object side 1c of the mirror group 1 and the image side of the last lens arranged along the first direction of at least part of the lens group 2 or the distance between the object side 1c of the mirror group 1 and the image side 1d of the mirror group 1 LEL to the total system optical length TTL of the camera module 300 within the range of less than 0.6, the height of the optical lens 10 and the camera module 300 is reduced, which is beneficial to reduce the shoulder height of the optical lens 10 and the camera module 300, and thus the miniaturization of the optical lens 10 and the camera module 300 is facilitated.

[0199] In other embodiments, LEL / TTL can also satisfy other ranges. The present application is not limited in particular.

[0200] Exemplarily, the optical lens 10 can satisfy: -1 < HP-1.25 x IH x tan(PA) < 5, where HP is the height of the folding element 3 in the first direction, and PA is the angle of the smallest acute angle inside the folding element 3. For example, HP-1.25 x IH x tan(PA) can be equal to -0.9, -0.5, 0, 0.38, 1, 1.68, 2, 2.6, 3.3, 3.8, 4, or 4.9, etc. It can be understood that by limiting HP-1.25 x IH x tan(PA) within the range of -1 to 5, the folded light path is facilitated, and thus the volume of the optical lens 10 is reduced, which is beneficial to the miniaturization of the optical lens 10.

[0201] In other embodiments, HP-1.25xIHxtan(PA) can also satisfy other ranges. Specifically, the present application is not limited.

[0202] In other embodiments, the minimum acute angle inside the folding element 3 is not limited to the sharp corner form shown in FIG. 2, for example, the minimum acute angle inside the folding element 3 can be rounded or ground flat according to actual needs. Specifically, the present application is not limited.

[0203] Exemplarily, the folding element 3 can satisfy: Vd>15, where Vd is the Abbe number of the folding element 3, for example, Vd can be equal to 16, 18, 23, 28, 30, 35 or 40, etc. It can be understood that the Abbe number of the folding element 3 is larger, the folding element 3 can have higher light receiving efficiency and transmittance, can increase the amount of light in the optical path, thereby enhancing the brightness and clarity of imaging, thereby enhancing the resolution of the optical lens 10, reducing optical distortion and color distortion, when the optical lens 10 is applied to the camera module 300 and the electronic device 1000, the imaging quality of the camera module 300 and the electronic device 1000 is better.

[0204] In other embodiments, the Abbe number Vd of the folding element 3 can also satisfy other ranges. Specifically, the present application is not limited.

[0205] As shown in FIG. 2, the camera module 300 includes, in order from the object side to the image side, a mirror group 1, a lens group 2, a folding element 3, a filter 30, and an image sensor 20. Exemplarily, the mirror group 1 can include a first reflecting lens 11, and the lens group 2 can include a first lens 21, a second lens 22, and a third lens 23. In other embodiments, the mirror group 1, the lens group 2, and the folding element 3 can all adopt other structures.

[0206] Exemplarily, by moving the image sensor 20, or the optical lens 10, or the first lens 21, the second lens 22, and the third lens 23 of the lens group 2, or the folding element 3, the auto-focusing of the camera module 300 is realized, and the imaging quality of the camera module 300 is improved.

[0207] The design parameters of the camera module 300 of the first embodiment of the present application are as follows in Table 1.

[0208] Table 1 Partial design parameters of each element of the camera module 300 of the first embodiment

[0209] It can be understood that in Table 1, OBJ can represent the object side of the optical lens 10; STO can represent a stop (not shown in the drawings); S1 can represent a first sub-region 111 of the object side 11a of the first reflective lens 11; S2 can represent a third sub-region 113 of the image side 11b of the first reflective lens 11; S3 can represent a second sub-region 112 of the image side 11b of the first reflective lens 11; S4 can represent a fourth sub-region 114 of the image side 11b of the first reflective lens 11; S5 and S6 can respectively represent the object side and the image side of the first lens 21; S7 and S8 can respectively represent the object side and the image side of the second lens 22; S9 and S10 can respectively represent the object side and the image side of the third lens 23; S11 can represent the entrance face 33 of the folding element 3; S12 can represent the first reflective face 35 of the folding element 3; S13 can represent the top face 31 of the folding element 3; S14 can represent the second reflective face 36 of the folding element 3; S15 can represent the exit face 34 of the folding element 3; S16 and S17 can respectively represent the object side and the image side of the filter 30; and S18 can represent the imaging face of the camera module.

[0210] In addition, the thickness of OBJ refers to the distance between the object and the object side of the optical lens 10. The thickness of S1 refers to the distance between the first sub-region 111 of the object side 11a of the first reflective lens 11 and the third sub-region 113 of the image side 11b of the first reflective lens 11. The thickness of S2 refers to the distance between the third sub-region 113 of the image side 11b of the first reflective lens 11 and the second sub-region 112 of the image side 11b of the first reflective lens 11. The thickness of S3 refers to the distance between the second sub-region 112 of the image side 11b of the first reflective lens 11 and the fourth sub-region 114 of the image side 11b of the first reflective lens 11. The thickness of S4 refers to the distance between the fourth sub-region 114 of the image side 11b of the first reflective lens 11 and the object side of the first lens 21. The thickness of S5 refers to the distance between the object side of the first lens 21 and the image side of the first lens 21. The thickness of S6 refers to the distance between the image side of the first lens 21 and the object side of the second lens 22. The thickness of S7 refers to the distance between the object side of the second lens 22 and the image side of the second lens 22. The thickness of S8 refers to the distance between the image side of the second lens 22 and the object side of the third lens 23. The thickness of S9 refers to the distance between the object side of the third lens 23 and the image side of the third lens 23. The thickness of S10 refers to the distance between the image side of the third lens 23 and the incident surface 33 of the folding element 3. The thickness of S11 refers to the distance between the incident surface 33 of the folding element 3 and the first reflective surface 35 of the folding element 3. The thickness of S12 refers to the distance between the first reflective surface 35 of the folding element 3 and the top surface 31 of the folding element 3. The thickness of S13 refers to the distance between the top surface 31 of the folding element 3 and the second reflective surface 36 of the folding element 3. The thickness of S14 refers to the distance between the second reflective surface 36 of the folding element 3 and the emergent surface 34 of the folding element 3. The thickness of S15 refers to the distance between the emergent surface 34 of the folding element 3 and the object side of the optical filter 30. The thickness of S16 refers to the distance between the object side of the optical filter 30 and the image side of the optical filter 30. The thickness of S17 refers to the distance between the image side of the optical filter 30 and the object side of the image sensor 20. S18 refers to the distance between the object side of the image sensor 20 and the imaging surface.

[0211] In Table 1, the thickness of S1 greater than 0 means that the light is transmitted on the first sub-region 111 of the object side 11a of the first reflective lens 11, and the light path does not turn. The thickness of S2 less than 0 means that the light is reflected on the third sub-region 113 of the image side 11b of the first reflective lens 11, and the light path turns. It can be understood that the positive and negative meanings of the thickness in Table 1 and the following tables are the same, and will not be repeated hereinafter.

[0212] The optical lens 10 satisfies: FOV=10.9°. It can be understood that by limiting the full field of view FOV of the optical lens 10 to be equal to 10.9°, the distortion and the aberration of the image edge are reduced or avoided, and the full field of view FOV of the optical lens 10 is smaller, the field of view of the optical lens 10 is smaller, and the optical magnification is larger, which can better meet the super-telephoto design of the optical lens 10.

[0213] The folding element 3 satisfies: Vd=42.7. It can be understood that the Abbe number of the folding element 3 is larger, which can reduce the dispersion and chromatic aberration problems in the optical lens 10, better correct the dispersion and chromatic aberration, and the resolution of the optical lens 10 is higher, and the imaging quality is clearer.

[0214] In addition, the aspheric coefficients of each element of the camera module 300 of the first embodiment of the present application are as shown in Table 2 below.

[0215] Table 2 Aspheric coefficients of each element of the camera module 300 of the first embodiment

[0216] A4, A6, A8, A 10 10, A 12 12, A 14 14, and A 16 16 are not present in the table. It can be understood that each parameter in the table is expressed in scientific notation. For example, 4.2364680E-06 means 4.2364680x10 -6 -1.1167354E-08 means -1.1167354x10 -8 It can be understood that the counting method of each parameter in the table is the same, and will not be repeated hereinafter.

[0217] It can be understood that among the 10 aspheric surfaces of the camera module 300 shown in Table 1 and Table 2, all even and odd aspheric surface types z can be defined by, but not limited to, the following aspheric formula:

[0218] Where z(x, y) is the optical surface sag; k is the conic coefficient; c is the curvature radius; r is the radius height in the optical axis direction; r 2 =x 2 +y 2 ; a i is the polynomial coefficient; r iis a standard radial coordinate. The design parameters of the first reflective lens 11, the first lens 21, the second lens 22 and the third lens 23 of the optical lens 10 are substituted into the above-mentioned aspherical surface formula, and the surface shapes of the object side and the image side of the first reflective lens 11, the first lens 21, the second lens 22 and the third lens 23 of the camera module 300 of the first embodiment of the present application can be obtained.

[0219] According to the data in Table 1 and Table 2, the partial parameters of the camera module 300 of the first embodiment of the present application can be obtained as shown in Table 3.

[0220] Table 3 Partial parameters of the camera module 300 of the first embodiment

[0221] Wherein, the back focal length RBL (i.e. the sum of the absolute value of the thickness of S4 to the absolute value of the thickness of S17 in Table 1) of the mirror group 1 and the focal length EFL of the optical lens 10 satisfy: RBL / EFL = 0.51. It can be understood that by limiting the ratio of the back focal length RBL of the mirror group 1 to the focal length EFL of the optical lens 10 to be equal to 0.51, it is ensured that the mirror group 1 has space inside which light can be reflected at least twice, and the optical lens 10 has sufficient space to arrange the lens group 2, so that the optical lens 10 has a higher magnification, and the super-telephoto shooting performance of the optical lens 10 is better.

[0222] Wherein, the distance LEL between the object side 1c of the mirror group 1 and the image side of the last lens of the lens group 2 arranged at least partially along the first direction and the height LH of the camera module 300 satisfy: LEL / LH = 0.68. It can be understood that by limiting the ratio of the distance LEL between the object side 1c of the mirror group 1 and the image side of the last lens of the lens group 2 arranged at least partially along the first direction to the height LH of the camera module 300 to be equal to 0.68, the height of the camera module 300 can be reduced, which is beneficial to reduce the shoulder height of the camera module 300, thereby facilitating the miniaturization of the camera module 300.

[0223] Wherein, the maximum light passing diameter LD of the region through which light passes the object side 1c of the mirror group 1 and the maximum light passing diameter LRD of the region from which light exits the image side 1d of the mirror group 1 satisfy: LD / LRD = 3.81. It can be understood that by limiting the ratio of the maximum light passing diameter LD of the region through which light passes the object side 1c of the mirror group 1 to the maximum light passing diameter LRD of the region from which light exits the image side 1d of the mirror group 1 to be equal to 3.81, the light reflected by the mirror group 1 is contracted, the height of the optical lens 10 is reduced, which is beneficial to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0224] The maximum light passing diameter LD of the region of the object side surface 1c of the mirror set 1 through which the light passes and the maximum light passing diameter RD of the region of the first lens 21 through which the light passes satisfy: LD / RD = 3.33. It can be understood that by limiting the ratio of the maximum light passing diameter LD of the region of the object side surface 1c of the mirror set 1 through which the light passes and the maximum light passing diameter RD of the region of the first lens 21 through which the light passes to be equal to 3.33, the light reflected by the mirror set 1 is contracted, the light is intercepted, and the off-axis aberration is corrected.

[0225] The thickness CTR of the mirror set 1 and the maximum light passing diameter LD of the region of the object side surface 1c of the mirror set 1 through which the light passes satisfy: CTR / LD = 0.30. It can be understood that by limiting the ratio of the thickness CTR of the mirror set 1 and the maximum light passing diameter LD of the region of the object side surface 1c of the mirror set 1 through which the light passes to be equal to 0.30, the light reflected by the mirror set 1 is contracted, the height of the optical lens 10 is reduced, which is beneficial to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0226] The maximum reflected light diameter DOR of the region closest to the object side on the mirror set 1 on which the light is reflected and the image height IH of the optical lens 10 satisfy: DOR / IH = 1.83. It can be understood that by limiting the ratio of the maximum reflected light diameter DOR of the region closest to the object side on the mirror set 1 on which the light is reflected and the image height IH of the optical lens 10 to be equal to 1.83, the obstruction of the on-axis light is reduced, the loss of light is reduced, and the imaging quality of the optical lens 10 is improved.

[0227] As shown in FIG. 2, the region closest to the object side on the mirror set 1 on which the light is reflected can be the second sub-region 112 of the first reflecting lens 11, for example. In other embodiments, when the mirror set 1 adopts other structures, the region closest to the object side on the mirror set 1 on which the light is reflected can be located on other surfaces of the first reflecting lens 11, for example, the region closest to the object side on the mirror set 1 on which the light is reflected can be located on the image side surface 11b of the first reflecting lens 11. The specific application is not limited.

[0228] The distance LEL between the object side 1c of the mirror group 1 and the image side of the last lens of the lens group 2 arranged along the first direction and the total length TTL of the system of the camera module 300 satisfy: LEL / TTL = 0.25. It can be understood that by limiting the ratio of the distance LEL between the object side 1c of the mirror group 1 and the image side of the last lens of the lens group 2 arranged along the first direction and the total length TTL of the system of the camera module 300 to be equal to 0.25, the height of the optical lens 10 and the camera module 300 is reduced, which is beneficial to reduce the shoulder height of the optical lens 10 and the camera module 300, thereby facilitating the miniaturization of the optical lens 10 and the camera module 300.

[0229] The height HP of the folding element 3, the image height IH of the optical lens 10, and the angle PA of the smallest acute angle inside the folding element 3 satisfy: HP-1.25xIHxtan(PA) = 0.43. It can be understood that by limiting HP-1.25xIHxtan(PA) to be equal to 0.43, the folded light path is facilitated, thereby reducing the volume of the optical lens 10, which is beneficial to realize the miniaturization of the optical lens 10.

[0230] Figure 3 is a simulation effect diagram one of the telephoto end of the camera module 300 of the first embodiment. It can be understood that in the coordinate system of Figure 4, the horizontal coordinate is the deviation value (focus, mm) along the optical axis direction, and the vertical coordinate is the normalized coordinate at the pupil. Wherein, a) represents the test wavelength of 470nm (nanometer); b) represents the test wavelength of 510nm; c) represents the test wavelength of 555nm; d) represents the test wavelength of 610nm; e) represents the test wavelength of 650nm, and the physical meaning is that the light of the corresponding wavelength emitted at 0 degree field of view deviates from the ideal image point after passing through the optical lens 10. The curve of Figure 4 can represent the axial chromatic aberration curve of the camera module 300, which represents the convergence point deviation of light of different wavelengths after passing through each lens of the optical system. It can be understood that in this application, when the same horizontal coordinate, vertical coordinate and figure annotation representing the same meaning appear again in the coordinate system representing the axial chromatic aberration curve of the camera module 300 in the subsequent, they will not be described again.

[0231] As shown in Figure 3, when the camera module 300 is at the telephoto end, the normalized coordinates of the camera module 300 are all small, the axial chromatic aberration (spherical aberration, chromatic aberration, etc.) of the camera module 300 is well corrected, and the imaging quality of the camera module 300 is high.

[0232] Figure 4 is a simulation effect diagram two of the telephoto end of the camera module 300 of the first embodiment. It can be understood that in the coordinate system of Figure 5, the horizontal coordinate is the deviation value along the optical axis (focus, mm), and the vertical coordinate is the image height (IMG HT, mm). The curve of Figure 5 can represent the astigmatic field curve of the camera module 300. The astigmatic field curve represents the meridional image surface curvature and sagittal image surface curvature, which is used to illustrate the deviation of the different field of view beam convergence point from the ideal imaging surface, wherein the solid line is the meridional direction beam, and the dotted line is the sagittal direction beam, the horizontal coordinate is the deviation value along the optical axis, and the vertical coordinate is the corresponding field of view. When a certain field of view value is too large, the image quality of the field of view is poor or there is high-order aberration. It can be understood that in this application, when the horizontal coordinate, vertical coordinate and annotations in the figure representing the same meaning appear again in the coordinate system representing the astigmatic field curve of the camera module 300 subsequently, they will not be described again.

[0233] As shown in Figure 4, when the camera module 300 is at the telephoto end, both the two direction field curvatures are small, the camera module 300 has a good depth of focus, and the imaging quality of the camera module 300 is high.

[0234] Figure 5 is a simulation effect diagram three of the telephoto end of the camera module 300 of the first embodiment. It can be understood that in the coordinate system of Figure 6, the horizontal coordinate is the optical distortion ratio (%), and the vertical coordinate is the image height (IMG HT, mm). The curve of Figure 6 can represent the distortion curve of the camera module 300. It can be understood that in this application, when the horizontal coordinate, vertical coordinate and annotations in the figure representing the same meaning appear again in the coordinate system representing the distortion curve of the camera module 300 subsequently, they will not be described again.

[0235] As shown in Figure 5, when the camera module 300 is at the telephoto end, the optical distortion ratio of the camera module 300 at different image heights is less than 2%, which can ensure that there is no obvious distortion of the picture, the degree of optical distortion of the image is small, and the imaging quality of the camera module 300 is high.

[0236] Second embodiment: please refer to Figure 6, which is a partial structure simplified schematic diagram one of the camera module 300 shown in Figure 1B in another embodiment.

[0237] In this embodiment, the camera module 300 includes, in order from the object side to the image side, a mirror group 1, a lens group 2, a folding element 3, a filter 30, and an image sensor 20.

[0238] As shown in Figure 6, the mirror group 1 may, for example, include a first reflective lens 11 and a second reflective lens 12, and the second reflective lens 12 can be located on the image side of the first reflective lens 11, that is, the second reflective lens 12 can be located between the first reflective lens 11 and the lens group 2.

[0239] For example, the second reflecting lens 12 includes an object side 12a and an image side 12b disposed opposite to each other, and the exit surface 1b of the reflecting mirror group 1 may be located on the image side 12b of the second reflecting lens 12.

[0240] For example, the object side 12a of the second reflecting lens 12 includes a fifth sub-region 121 and a sixth sub-region 122, wherein the fifth sub-region 121 may be arranged around the sixth sub-region 122.

[0241] Exemplarily, the image-side surface 12b of the second reflecting lens 12 includes a seventh sub-region 123 and an eighth sub-region 124, wherein the seventh sub-region 123 may be disposed around the eighth sub-region 124. The seventh sub-region 123 may be curved toward the object side. In other words, the central region of the seventh sub-region 123 may bulge toward the lens group 2. The eighth sub-region 124 may be curved toward the image side. In other words, the central region of the eighth sub-region 124 may bulge away from the lens group 2.

[0242] In other embodiments, the fifth sub-region 121 and the sixth sub-region 122 of the object side 12a of the second reflecting lens 12 can be configured in other ways. The seventh sub-region 123 and the eighth sub-region 124 of the image side 12b of the second reflecting lens 12 can also be configured in other ways.

[0243] For example, after light enters the first reflecting lens 11, it exits the first reflecting lens 11 through the transmission area of ​​the third sub-region 113, and enters the second reflecting lens 12 through the transmission area of ​​the fifth sub-region 121. After the first reflection occurs in the reflection area of ​​the seventh sub-region 123, the light exits the second reflecting lens 12 through the transmission area of ​​the fifth sub-region 121, and enters the first reflecting lens 11 through the transmission area of ​​the third sub-region 113. After the second reflection occurs in the reflection area of ​​the second sub-region 112, the light exits the second reflecting lens 12 through the eighth sub-region 124 of the image side 12b, and enters the lens group 2.

[0244] It is understandable that the first reflecting lens 11 and the second reflecting lens 12 can deflect the light entering the optical lens 10. The light can be reflected once inside the first reflecting lens 11 and once inside the second reflecting lens 12. On the one hand, the total length of the light path is increased, which is beneficial for achieving telephoto shooting with the optical lens 10; on the other hand, increasing the total length of the light path through reflection can reduce the physical length and height of the optical lens 10, which is beneficial for achieving a compact setting of the optical lens 10, thereby reducing the height of the optical lens 10 and ultimately achieving a miniaturized setting of the optical lens 10.

[0245] It is understood that the second sub-region 112 of the object-side surface 11a of the first reflecting lens 11 can be the reflecting surface closest to the object side of the mirror assembly 1. The second sub-region 112 of the object-side surface 11a of the first reflecting lens 11 can be the second reflecting surface 1f of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the second reflecting surface 1f of the mirror assembly 1.

[0246] It is understood that the seventh sub-region 123 of the image-side surface 12b of the second reflecting lens 12 can be the reflecting surface closest to the image side of the mirror assembly 1. The seventh sub-region 123 of the image-side surface 12b of the second reflecting lens 12 can be the first reflecting surface 1e of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the first reflecting surface 1e of the mirror assembly 1.

[0247] For example, the lens group 2 has two lenses. The optical lens 10 includes a first lens 21 and a second lens 22 arranged sequentially from the object side to the image side.

[0248] For example, the cross-section of the folding element 3 is approximately trapezoidal. The folding element 3 includes a top surface 31 and a bottom surface 32 facing away from each other, an incident surface 33, an exit surface 34, a first reflecting surface 35, and a second reflecting surface 36. The incident surface 33 and the exit surface 34 of the folding element 3 are both located on the top surface 31 of the folding element 3. After light passes through the mirror group 1 and the lens group 2 and enters the folding element 3, it is reflected at the first reflecting surface 35, the top surface 31, and the second reflecting surface 36 of the folding element 3. In one embodiment, a first reflection occurs at the first reflecting surface 35, a second reflection occurs at the top surface 31, and a third reflection occurs at the second reflecting surface 36.

[0249] It is understandable that light can undergo multiple reflections on the top surface 31, the first reflecting surface 35, and the second reflecting surface 36 of the folding element 3, thereby increasing the total length of the optical path. The folding element 3 can cooperate with the mirror group 1 to further increase the total length of the optical path, which is more conducive to achieving telephoto shooting of the optical lens 10. In addition, since the folding element 3 increases the total length of the optical path through reflection, the overall physical length and height of the optical lens 10 can be kept relatively short, and the overall optical length of the camera module 300 is not likely to increase significantly, which is conducive to reducing the height of the optical lens 10, thereby achieving a miniaturized design of the optical lens 10.

[0250] For example, by moving the image sensor 20, or the optical lens 10, or the first lens 21 and the second lens 22 of the lens group 2, or the folding element 3, the camera module 300 can achieve autofocus and improve the imaging quality of the camera module 300.

[0251] Some design parameters of the camera module 300 in the second embodiment of this application are shown in Table 4 below.

[0252] Table 4 shows partial design parameters of each component of the camera module 300 in the second embodiment.

[0253] It is understood that in Table 4, OBJ can represent the object-side surface of the optical lens 10; STO can represent the aperture stop (not shown in the attached figures); S1 can represent the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11; S2 can represent the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11; S3 can represent the fifth sub-region 121 of the object-side surface 12a of the second reflecting lens 12; S4 can represent the seventh sub-region 123 of the image-side surface 12b of the second reflecting lens 12; S5 can represent the fifth sub-region 121 of the object-side surface 12a of the second reflecting lens 12; S6 can represent the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11; S7 can represent the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11; S8 can represent the first reflecting lens 11... S11 represents the fourth sub-region 114 of the image side 11b; S9 can represent the sixth sub-region 122 of the object side 12a of the second reflecting lens 12; S10 can represent the eighth sub-region 124 of the image side 12b of the second reflecting lens 12; S11 and S12 can represent the object side and image side of the first lens 21 respectively; S13 and S14 can represent the object side and image side of the second lens 22 respectively; S15 can represent the incident surface 33 of the folding element 3; S16 can represent the first reflecting surface 35 of the folding element 3; S17 can represent the top surface 31 of the folding element 3; S18 can represent the second reflecting surface 36 of the folding element 3; S19 can represent the exit surface 34 of the folding element 3; S20 and S21 can represent the object side and image side of the filter 30 respectively; S22 can represent the imaging surface of the camera module.

[0254] Additionally, the thickness of OBJ refers to the distance between the object being photographed and the object-side surface of the optical lens 10. The thickness of S1 refers to the distance between the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11 and the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11. The thickness of S2 refers to the distance between the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 and the fifth sub-region 121 of the object-side surface 12a of the second reflecting lens 12. The thickness of S3 refers to the distance between the fifth sub-region 121 of the object-side surface 12a of the second reflecting lens 12 and the seventh sub-region 123 of the image-side surface 12b of the second reflecting lens 12. The thickness of S4 refers to the distance between the seventh sub-region 123 of the image-side surface 12b of the second reflecting lens 12 and the fifth sub-region 121 of the object-side surface 12a of the second reflecting lens 12. The thickness of S5 refers to the distance between the fifth sub-region 121 of the object-side surface 12a of the second reflecting lens 12 and the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11. The thickness of S6 refers to the distance between the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11 and the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11. The thickness of S7 refers to the distance between the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11 and the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11. The thickness of S8 refers to the distance between the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11 and the sixth sub-region 122 of the object-side surface 12a of the second reflecting lens 12. The thickness of S9 refers to the distance between the sixth sub-region 122 of the object-side surface 12a of the second reflecting lens 12 and the eighth sub-region 124 of the image-side surface 12b of the second reflecting lens 12. The thickness of S10 refers to the distance between the eighth sub-region 124 of the image-side surface 12b of the second reflecting lens 12 and the object-side surface of the first lens 21. The thickness of S11 refers to the distance between the object-side surface and the image-side surface of the first lens 21. The thickness of S12 refers to the distance between the image-side surface of the first lens 21 and the object-side surface of the second lens 22. The thickness of S13 refers to the distance between the object-side surface of the second lens 22 and the image-side surface of the second lens 22. The thickness of S14 refers to the distance between the image-side surface of the second lens 22 and the incident surface 33 of the folding element 3. The thickness of S15 refers to the distance between the incident surface 33 of the folding element 3 and the first reflecting surface 35 of the folding element 3. The thickness of S16 refers to the distance between the first reflecting surface 35 of the folding element 3 and the top surface 31 of the folding element 3. The thickness of S17 refers to the distance between the top surface 31 of the folding element 3 and the second reflecting surface 36 of the folding element 3. The thickness of S18 refers to the distance between the second reflecting surface 36 of the folding element 3 and the exit surface 34 of the folding element 3. The thickness of S19 refers to the distance between the exit surface 34 of the folding element 3 and the object-side surface of the filter 30.The thickness of S20 refers to the distance between the object-side surface of the filter 30 and the image-side surface of the filter 30. The thickness of S21 refers to the distance between the image-side surface of the filter 30 and the object-side surface of the image sensor 20. S22 refers to the distance between the object-side surface of the image sensor 20 and the imaging surface.

[0255] Among them, the optical lens 10 satisfies: FOV = 12.8°. It can be understood that by limiting the full field of view (FOV) of the optical lens 10 to 12.8°, distortion and falsification at the image edges are reduced or avoided. Moreover, the optical lens 10 has a smaller full field of view (FOV), a smaller field of view, and a larger optical magnification, which can better meet the ultra-telephoto design requirements of the optical lens 10.

[0256] Among them, the folding element 3 satisfies: Vd = 42.7. It can be understood that the folding element 3 has a large Abbe number, which can reduce the chromatic aberration and dispersion problems in the optical lens 10, and can better correct chromatic aberration and dispersion, resulting in higher resolution and clearer image quality of the optical lens 10.

[0257] In addition, the aspherical coefficients of each element of the camera module 300 in the second embodiment of this application are shown in Table 5 below.

[0258] Table 5 Aspheric coefficients of various components of the camera module 300 in the second embodiment.

[0259] It is understandable that, among the 14 aspherical surfaces of the camera module 300 shown in Tables 4 and 5, all even-order and odd-order aspherical surface shapes z can be constrained using, but are not limited to, the following aspherical formulas:

[0260] Where z(x,y) is the optical surface sagitta; k is the conic coefficient; c is the radius of curvature; r is the radius height along the optical axis; r 2 =x 2 +y 2 ;α i These are the polynomial coefficients; r i These are standardized radial coordinates. By substituting the design parameters of the first reflecting lens 11, the second reflecting lens 12, the first lens 21, and the second lens 22 of the optical lens 10 into the above aspherical formula, the object-side and image-side surface shapes of the first reflecting lens 11, the second reflecting lens 12, the first lens 21, and the second lens 22 of the camera module 300 in the second embodiment of this application can be obtained.

[0261] Based on the data in Tables 4 and 5, some parameters of the camera module 300 in the second embodiment of this application can be obtained as shown in Table 6 below.

[0262] Table 6. Partial parameters of the camera module 300 in the second embodiment.

[0263] It is understood that the setting range of the relevant optical parameters in this embodiment can be referred to the setting range of the relevant optical parameters in the first embodiment.

[0264] The back focal length RBL of the mirror group 1 (which is the sum of the absolute values ​​of the thicknesses of S10 and S21 in Table 4) and the focal length EFL of the optical lens 10 satisfy the following ratio: RBL / EFL = 0.46. It can be understood that by limiting the ratio of the back focal length RBL of the mirror group 1 to the focal length EFL of the optical lens 10 to 0.51, it ensures that the interior of the mirror group 1 has space where light can undergo at least two reflections, and that the optical lens 10 has sufficient space to arrange the lens group 2, resulting in a high magnification of the optical lens 10 and good super-telephoto shooting performance.

[0265] The distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction, and the height LH of the camera module 300 satisfy: LEL / LH = 0.62. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction to the height LH of the camera module 300 to 0.62, the height of the camera module 300 can be reduced, which is beneficial for reducing the shoulder height of the camera module 300, thereby facilitating the miniaturization of the camera module 300.

[0266] The distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction, and the total system optical length TTL of the camera module 300 satisfy: LEL / TTL = 0.21. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction to the total system optical length TTL of the camera module 300 to 0.21, the height of the optical lens 10 and the camera module 300 is reduced, which is beneficial for reducing the shoulder height of the optical lens 10 and the camera module 300, thereby facilitating the miniaturization of the optical lens 10 and the camera module 300.

[0267] The thickness CTR of the mirror group 1 and the maximum light transmission diameter LD of the area through which light passes through the object side 1c of the mirror group 1 satisfy the following condition: CTR / LD = 0.31. It can be understood that by limiting the ratio of the thickness CTR of the mirror group 1 to the maximum light transmission diameter LD of the area through which light passes through the object side 1c of the mirror group 1 to 0.31, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0268] The maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 and the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 satisfy the following ratio: LD / LRD = 3.33. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 to the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 to 3.33, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0269] The height HP of the folding element 3, the image height IH of the optical lens 10, and the angle PA of the minimum acute angle inside the folding element 3 satisfy: HP - 1.25 × IH × tan(PA) = 0.30. It can be understood that by limiting HP - 1.25 × IH × tan(PA) to 0.30, the optical path is folded, thereby reducing the size of the optical lens 10 and facilitating its miniaturization.

[0270] In other embodiments, the form of the minimum acute angle inside the folding element 3 is not limited to the sharp angle shown in FIG. 6. For example, the minimum acute angle inside the folding element 3 can be rounded or ground into a flat surface according to actual needs. This application does not limit the specific implementation.

[0271] Specifically, the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 and the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 satisfy the condition: LD / RD = 3.26. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 to the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 to 3.26, the light reflected by the mirror group 1 is reduced, while simultaneously intercepting the light and correcting off-axis aberrations.

[0272] Specifically, the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 satisfies the ratio of DOR / IH of the optical lens 10 to 1.64. It can be understood that by limiting the ratio of the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 to the image height IH of the optical lens 10 to 1.64, the obstruction of on-axis light rays is reduced, light loss is decreased, thereby improving the imaging quality of the optical lens 10.

[0273] Figure 7 is a simulation effect diagram of the telephoto end of the camera module 300 in the second embodiment.

[0274] As shown in Figure 7, when the camera module 300 is at the telephoto end, the normalized coordinates of the camera module 300 are all small, the axial chromatic aberration (spherical aberration, chromatic aberration, etc.) correction of the camera module 300 is better, and the imaging quality of the camera module 300 is higher.

[0275] Figure 8 is a simulation effect diagram of the telephoto end of the camera module 300 in the second embodiment.

[0276] As shown in Figure 8, when the camera module 300 is at the telephoto end, the field curvature in both directions is small, the camera module 300 has a good depth of focus, and the imaging quality of the camera module 300 is high.

[0277] Figure 9 is a simulation effect diagram of the telephoto end of the camera module 300 in the second embodiment.

[0278] As shown in Figure 9, when the camera module 300 is at the telephoto end, the optical distortion ratio of the camera module 300 at different image heights is less than 2%, which can ensure that there is no obvious distortion in the image, the degree of optical distortion of the image is small, and the imaging quality of the camera module 300 is high.

[0279] Third implementation: Please refer to Figure 10, which is a simplified schematic diagram of part of the structure of the camera module 300 shown in Figure 1B in another implementation.

[0280] In this embodiment, the camera module 300 includes a mirror group 1, a lens group 2, a folding element 3, a filter 30, and an image sensor 20 arranged sequentially from the object side to the image side.

[0281] For example, the mirror assembly 1 includes a first reflecting lens 11, and the exit surface 1b of the mirror assembly 1 may be located in the fourth sub-region 114 of the image side surface 11b of the first reflecting lens 11.

[0282] For example, after light enters the first reflecting lens 11, it undergoes a first reflection on the third sub-region 113 of the image side 11b of the first reflecting lens 11, a second reflection on the second sub-region 112 of the object side 11a of the first reflecting lens 11, and then exits the first reflecting lens 11 from the fourth sub-region 114 of the image side 11b of the first reflecting lens 11 and enters the lens group 2.

[0283] It is understood that the second sub-region 112 of the object-side surface 11a of the first reflecting lens 11 can be the reflecting surface closest to the object side of the mirror assembly 1. The second sub-region 112 of the object-side surface 11a of the first reflecting lens 11 can be the second reflecting surface 1f of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the second reflecting surface 1f of the mirror assembly 1.

[0284] It is understood that the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 can be the reflecting surface closest to the image side of the mirror assembly 1. The third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 can be the first reflecting surface 1e of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the first reflecting surface 1e of the mirror assembly 1.

[0285] For example, the lens group 2 has three lenses. The lens group 2 includes a first lens 21, a second lens 22 and a third lens 23 arranged sequentially from the object side to the image side.

[0286] For example, the cross-section of the folding element 3 is approximately trapezoidal. The folding element 3 includes a top surface 31 and a bottom surface 32 facing away from each other, an incident surface 33, an exit surface 34, a first reflecting surface 35, and a second reflecting surface 36. The incident surface 33 and the exit surface 34 of the folding element 3 are both located on the top surface 31 of the folding element 3. Light rays passing through the mirror group 1 and the lens group 2 enter the folding element 3 and are reflected at the first reflecting surface 35, the top surface 31, the bottom surface 32, and the second reflecting surface 36 of the folding element 3. In one embodiment, a first reflection occurs on the first reflecting surface 35, a second reflection occurs on the top surface 31, a third reflection occurs on the bottom surface 32, a fourth reflection occurs on the top surface 31, and a fifth reflection occurs on the second reflecting surface 36.

[0287] It is understandable that light can undergo multiple reflections on the top surface 31, bottom surface 32, first reflective surface 35, and second reflective surface 36 of the folding element 3, thereby increasing the total length of the optical path. The folding element 3 can cooperate with the reflector group 1 to further increase the total length of the optical path, which is more conducive to achieving telephoto shooting of the optical lens 10. In addition, since the folding element 3 increases the total length of the optical path through reflection, the overall physical length and height of the optical lens 10 can be kept relatively short, and the overall optical length of the camera module 300 is not likely to increase significantly, which is conducive to reducing the height of the optical lens 10, thereby achieving a miniaturized design of the optical lens 10.

[0288] For example, by moving the image sensor 20, or the optical lens 10, or the first lens 21, the second lens 22 and the third lens 23 of the lens group 2, or the folding element 3, the camera module 300 can achieve automatic focusing and improve the imaging quality of the camera module 300.

[0289] Some design parameters of the camera module 300 in the third embodiment of this application are shown in Table 7 below.

[0290] Table 7 shows partial design parameters of each component of the camera module 300 in the third embodiment.

[0291] It is understood that in Table 7, OBJ can represent the object-side surface of optical lens 10; STO can represent the aperture stop (not shown in the attached figures); S1 can represent the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11; S2 can represent the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11; S3 can represent the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11; S4 can represent the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11; S5 and S6 can represent the object-side surface and image-side surface of the first lens 21, respectively; S7 and S8 can represent the second lens 21, respectively. S9 and S10 can represent the object-side surface and image-side surface of the third lens 23, respectively; S11 can represent the incident surface 33 of the folding element 3; S12 can represent the first reflecting surface 35 of the folding element 3; S13 can represent the top surface 31 of the folding element 3; S14 can represent the bottom surface 32 of the folding element 3; S15 can represent the top surface of the folding element 3; S16 can represent the second reflecting surface 36 of the folding element 3; S17 can represent the exit surface 34 of the folding element 3; S18 and S19 can represent the object-side surface and image-side surface of the filter 30, respectively; S20 can represent the imaging surface of the camera module.

[0292] Additionally, the thickness of OBJ refers to the distance between the object being photographed and the object-side surface of the optical lens 10. The thickness of S1 refers to the distance between the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11 and the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11. The thickness of S2 refers to the distance between the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 and the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11. The thickness of S3 refers to the distance between the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11 and the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11. The thickness of S4 refers to the distance between the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11 and the object-side surface of the first lens 21. The thickness of S5 refers to the distance between the object-side surface of the first lens 21 and the image-side surface of the first lens 21. The thickness of S6 refers to the distance between the image-side surface of the first lens 21 and the object-side surface of the second lens 22. The thickness of S7 refers to the distance between the object-side surface and the image-side surface of the second lens 22. The thickness of S8 refers to the distance between the image-side surface of the second lens 22 and the object-side surface of the third lens 23. The thickness of S9 refers to the distance between the object-side surface and the image-side surface of the third lens 23. The thickness of S10 refers to the distance between the image-side surface of the third lens 23 and the incident surface 33 of the folding element 3. The thickness of S11 refers to the distance between the incident surface 33 of the folding element 3 and the first reflecting surface 35 of the folding element 3. The thickness of S12 refers to the distance between the first reflecting surface 35 of the folding element 3 and the top surface 31 of the folding element 3. The thickness of S13 refers to the distance between the top surface 31 of the folding element 3 and the bottom surface 32 of the folding element 3. The thickness of S14 refers to the distance between the bottom surface 32 of the folding element 3 and the top surface 31 of the folding element 3. The thickness of S15 refers to the distance between the top surface 31 of the folding element 3 and the second reflecting surface 36 of the folding element 3. The thickness of S16 refers to the distance between the second reflecting surface 36 of the folded element 3 and the exiting surface 34 of the folded element 3. The thickness of S17 refers to the distance between the exiting surface 34 of the folded element 3 and the object-side surface of the filter 30. The thickness of S18 refers to the distance between the object-side surface of the filter 30 and the image-side surface of the filter 30. The thickness of S19 refers to the distance between the image-side surface of the filter 30 and the object-side surface of the image sensor 20. S20 refers to the distance between the object-side surface of the image sensor 20 and the imaging surface.

[0293] Among them, the optical lens 10 satisfies: FOV = 8.1°. It can be understood that by limiting the full field of view (FOV) of the optical lens 10 to 8.1°, distortion and falsification at the image edges are reduced or avoided. Moreover, the optical lens 10 has a smaller full field of view (FOV), a smaller field of view, and a larger optical magnification, which can better meet the ultra-telephoto design of the optical lens 10.

[0294] Among them, the folding element 3 satisfies: Vd = 42.7. It can be understood that the folding element 3 has a large Abbe number, which can reduce the chromatic aberration and dispersion problems in the optical lens 10, and can better correct chromatic aberration and dispersion, resulting in higher resolution and clearer image quality of the optical lens 10.

[0295] Furthermore, the aspherical coefficients of each element of the camera module 300 in the third embodiment of this application are shown in Table 8 below.

[0296] Table 8 shows the aspherical coefficients of each component of the camera module 300 in the third embodiment.

[0297] It is understandable that, among the 10 aspherical surfaces of the camera module 300 shown in Tables 7 and 8, all even-order and odd-order aspherical surface shapes z can be limited using, but are not limited to, the following aspherical formulas:

[0298] Where z(x,y) is the optical surface sagitta; k is the conic coefficient; c is the radius of curvature; r is the radius height along the optical axis; r 2 =x 2 +y 2 ;α i These are the polynomial coefficients; r i These are standardized radial coordinates. By substituting the design parameters of the first reflecting lens 11, the first lens 21, the second lens 22, and the third lens 23 of the optical lens 10 into the above aspherical formula, the object-side and image-side surface shapes of the first reflecting lens 11, the first lens 21, the second lens 22, and the third lens 23 of the camera module 300 in the third embodiment of this application can be obtained.

[0299] Based on the data in Tables 7 and 8, some parameters of the camera module 300 in the third embodiment of this application can be obtained as shown in Table 9 below.

[0300] Table 9. Partial parameters of the camera module 300 in the third embodiment.

[0301] It is understood that the setting range of the relevant optical parameters in this embodiment can be referred to the setting range of the relevant optical parameters in the first embodiment.

[0302] The back focal length RBL of the mirror group 1 (which is the sum of the absolute values ​​of the thicknesses of S4 and S17 in Table 7) and the focal length EFL of the optical lens 10 satisfy the following ratio: RBL / EFL = 0.49. It can be understood that by limiting the ratio of the back focal length RBL of the mirror group 1 to the focal length EFL of the optical lens 10 to 0.49, it ensures that the interior of the mirror group 1 has space where light can undergo at least two reflections, and that the optical lens 10 has sufficient space to arrange the lens group 2, resulting in a high magnification of the optical lens 10 and good super-telephoto shooting performance.

[0303] The distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction, and the height LH of the camera module 300 satisfy: LEL / LH = 0.22. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction to the height LH of the camera module 300 to 0.22, the height of the camera module 300 can be reduced, which is beneficial for reducing the shoulder height of the camera module 300, thereby facilitating the miniaturization of the camera module 300.

[0304] The distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction, and the total system optical length TTL of the camera module 300 satisfy: LEL / TTL = 0.22. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction to the total system optical length TTL of the camera module 300 to 0.22, the height of the optical lens 10 and the camera module 300 is reduced, which is beneficial for reducing the shoulder height of the optical lens 10 and the camera module 300, thereby facilitating the miniaturization of the optical lens 10 and the camera module 300.

[0305] The thickness CTR of the mirror group 1 and the maximum light transmission diameter LD of the area through which light passes via the object side 1c of the mirror group 1 satisfy the condition: CTR / LD = 0.34. It can be understood that by limiting the ratio of the thickness CTR of the mirror group 1 to the maximum light transmission diameter LD of the area through which light passes via the object side 1c of the mirror group 1 to 0.34, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0306] Specifically, the maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 and the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 satisfy the following ratio: LD / LRD = 4.19. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 to the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 to 4.19, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0307] The height HP of the folding element 3, the image height IH of the optical lens 10, and the angle PA of the minimum acute angle inside the folding element 3 satisfy: HP - 1.25 × IH × tan(PA) = 1.02. It can be understood that by limiting HP - 1.25 × IH × tan(PA) to 1.02, it is beneficial to fold the optical path, thereby reducing the size of the optical lens 10 and facilitating its miniaturization.

[0308] In other embodiments, the form of the minimum acute angle inside the folding element 3 is not limited to the sharp angle shown in FIG10. For example, the minimum acute angle inside the folding element 3 can be rounded or ground into a flat surface according to actual needs. This application does not limit the specific implementation.

[0309] Specifically, the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 and the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 satisfy the condition: LD / RD = 4.00. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 to the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 to 4.00, the light reflected by the mirror group 1 is reduced, while simultaneously intercepting the light and correcting off-axis aberrations.

[0310] Specifically, the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 satisfies the ratio of DOR / IH of the optical lens 10 to 1.94. It can be understood that by limiting the ratio of the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 to the image height IH of the optical lens 10 to 1.94, the obstruction of on-axis light rays is reduced, light loss is decreased, thereby improving the imaging quality of the optical lens 10.

[0311] Figure 11 is a simulation effect diagram of the telephoto end of the camera module 300 in the third embodiment.

[0312] As shown in Figure 11, when the camera module 300 is at the telephoto end, the normalized coordinates of the camera module 300 are all small, the axial chromatic aberration (spherical aberration, chromatic aberration, etc.) correction of the camera module 300 is better, and the imaging quality of the camera module 300 is higher.

[0313] Figure 12 is a simulation effect diagram of the telephoto end of the camera module 300 in the third embodiment.

[0314] As shown in Figure 12, when the camera module 300 is at the telephoto end, the field curvature in both directions is small, the camera module 300 has a good depth of focus, and the imaging quality of the camera module 300 is high.

[0315] Figure 13 is a simulation effect diagram of the telephoto end of the camera module 300 in the third embodiment.

[0316] As shown in Figure 13, when the camera module 300 is at the telephoto end, the optical distortion ratio of the camera module 300 at different image heights is less than 2%, which can ensure that there is no obvious distortion in the image, the degree of optical distortion of the image is small, and the imaging quality of the camera module 300 is high.

[0317] Fourth implementation: Please refer to Figure 14, which is a simplified schematic diagram of part of the structure of the camera module 300 shown in Figure 1B in another implementation.

[0318] In this embodiment, the camera module 300 includes a mirror group 1, a lens group 2, a folding element 3, a filter 30, and an image sensor 20 arranged sequentially from the object side to the image side.

[0319] For example, the mirror assembly 1 includes a first reflecting lens 11, and the exit surface 1b of the mirror assembly 1 may be located in the fourth sub-region 114 of the image side surface 11b of the first reflecting lens 11.

[0320] For example, after light enters the first reflecting lens 11, it undergoes a first reflection on the third sub-region 113 of the image side 11b of the first reflecting lens 11, a second reflection on the second sub-region 112 of the object side 11a of the first reflecting lens 11, and then exits the first reflecting lens 11 from the fourth sub-region 114 of the image side 11b of the first reflecting lens 11 and enters the lens group 2.

[0321] It is understood that the second sub-region 112 of the object-side surface 11a of the first reflecting lens 11 can be the reflecting surface closest to the object side of the mirror assembly 1. The second sub-region 112 of the object-side surface 11a of the first reflecting lens 11 can be the second reflecting surface 1f of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the second reflecting surface 1f of the mirror assembly 1.

[0322] It is understood that the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 can be the reflecting surface closest to the image side of the mirror assembly 1. The third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 can be the first reflecting surface 1e of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the first reflecting surface 1e of the mirror assembly 1.

[0323] For example, the lens group 2 has three lenses. The lens group 2 includes a first lens 21, a second lens 22 and a third lens 23 arranged sequentially from the object side to the image side.

[0324] For example, the cross-section of the folding element 3 is approximately parallelogram-shaped. The folding element 3 includes a top surface 31 and a bottom surface 32 facing away from each other, an incident surface 33, an exit surface 34, a first reflecting surface 35, and a second reflecting surface 36. The incident surface 33 of the folding element 3 is located on the top surface 31, and the exit surface 34 is located on the bottom surface 32. Light rays passing through the mirror group 1 and lens group 2 enter the folding element 3 and are reflected at the first reflecting surface 35, the top surface 31, and the second reflecting surface 36. In one embodiment, a first reflection occurs at the first reflecting surface 35, a second reflection occurs at the top surface 31, and a third reflection occurs at the second reflecting surface 36.

[0325] It is understandable that light can undergo multiple reflections on the top surface 31, the first reflecting surface 35, and the second reflecting surface 36 of the folding element 3, thereby increasing the total length of the optical path. The folding element 3 can cooperate with the mirror group 1 to further increase the total length of the optical path, which is more conducive to achieving telephoto shooting of the optical lens 10. In addition, since the folding element 3 increases the total length of the optical path through reflection, the overall physical length and height of the optical lens 10 can be kept relatively short, and the overall optical length of the camera module 300 is not likely to increase significantly, which is conducive to reducing the height of the optical lens 10, thereby achieving a miniaturized design of the optical lens 10.

[0326] For example, by moving the image sensor 20, or the optical lens 10, or the first lens 21, the second lens 22 and the third lens 23 of the lens group 2, or the folding element 3, the camera module 300 can achieve automatic focusing and improve the imaging quality of the camera module 300.

[0327] Some design parameters of the camera module 300 in the fourth embodiment of this application are shown in Table 10 below.

[0328] Table 10 shows partial design parameters of each component of the camera module 300 in the fourth embodiment.

[0329] It is understood that in Table 10, OBJ can represent the object-side surface of the optical lens 10; STO can represent the aperture stop (not shown in the attached figures); S1 can represent the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11; S2 can represent the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11; S3 can represent the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11; S4 can represent the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11; S5 and S6 can represent the object-side surface and image-side surface of the first lens 21, respectively; S7 and S8 can represent... S10 and S11 represent the object-side surface and image-side surface of the second lens 22, respectively; S12 and S13 represent the object-side surface and image-side surface of the third lens 23, respectively; S14 and S15 represent the incident surface 33 of the folding element 3; S16 and S17 represent the first reflecting surface 35 of the folding element 3; S18 and S19 represent the object-side surface and image-side surface of the filter 30, respectively; S19 represents the imaging surface of the camera module.

[0330] Additionally, the thickness of OBJ refers to the distance between the object being photographed and the object-side surface of the optical lens 10. The thickness of S1 refers to the distance between the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11 and the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11. The thickness of S2 refers to the distance between the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 and the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11. The thickness of S3 refers to the distance between the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11 and the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11. The thickness of S4 refers to the distance between the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11 and the object-side surface of the first lens 21. The thickness of S5 refers to the distance between the object-side surface of the first lens 21 and the image-side surface of the first lens 21. The thickness of S6 refers to the distance between the image-side surface of the first lens 21 and the object-side surface of the second lens 22. The thickness of S7 refers to the distance between the object-side surface and the image-side surface of the second lens 22. The thickness of S8 refers to the distance between the image-side surface of the second lens 22 and the object-side surface of the third lens 23. The thickness of S9 refers to the distance between the object-side surface and the image-side surface of the third lens 23. The thickness of S10 refers to the distance between the image-side surface of the third lens 23 and the incident surface 33 of the folding element 3. The thickness of S11 refers to the distance between the incident surface 33 of the folding element 3 and the first reflecting surface 35 of the folding element 3. The thickness of S12 refers to the distance between the first reflecting surface 35 of the folding element 3 and the top surface 31 of the folding element 3. The thickness of S13 refers to the distance between the top surface 31 of the folding element 3 and the bottom surface 32 of the folding element 3. The thickness of S14 refers to the distance between the bottom surface 32 of the folding element 3 and the second reflecting surface 36 of the folding element 3. The thickness of S15 refers to the distance between the second reflecting surface 36 of the folding element 3 and the exit surface 34 of the folding element 3. The thickness of S16 refers to the distance between the exit surface 34 of the folded element 3 and the object-side surface of the filter 30. The thickness of S17 refers to the distance between the object-side surface of the filter 30 and the image-side surface of the filter 30. The thickness of S18 refers to the distance between the image-side surface of the filter 30 and the object-side surface of the image sensor 20. S19 refers to the distance between the object-side surface of the image sensor 20 and the imaging surface.

[0331] Among them, the optical lens 10 satisfies: FOV = 11°. It can be understood that by limiting the full field of view (FOV) of the optical lens 10 to 11°, distortion and falsification at the image edges are reduced or avoided. Moreover, the optical lens 10 has a smaller full field of view (FOV), a smaller field of view, and a larger optical magnification, which can better meet the ultra-telephoto design requirements of the optical lens 10.

[0332] Among them, the folding element 3 satisfies: Vd = 42.7. It can be understood that the folding element 3 has a large Abbe number, which can reduce the chromatic aberration and dispersion problems in the optical lens 10, and can better correct chromatic aberration and dispersion, resulting in higher resolution and clearer image quality of the optical lens 10.

[0333] In addition, the aspherical coefficients of each element of the camera module 300 in the fourth embodiment of this application are shown in Table 11 below.

[0334] Table 11 Aspheric coefficients of various components of the camera module 300 in the fourth embodiment.

[0335] It is understandable that, among the 10 aspherical surfaces of the camera module 300 shown in Tables 10 and 11, all even and odd-order aspherical surface shapes z can be defined using, but are not limited to, the following aspherical formulas:

[0336] Where z(x,y) is the optical surface sagitta; k is the conic coefficient; c is the radius of curvature; r is the radius height along the optical axis; r 2 =x 2 +y 2 ;α i These are the polynomial coefficients; r i These are standardized radial coordinates. By substituting the design parameters of the first reflecting lens 11, the first lens 21, the second lens 22, and the third lens 23 of the optical lens 10 into the above aspherical formula, the object-side and image-side surface shapes of the first reflecting lens 11, the first lens 21, the second lens 22, and the third lens 23 of the camera module 300 in the fourth embodiment of this application can be obtained.

[0337] Based on the data in Tables 10 and 11, some parameters of the camera module 300 in the fourth embodiment of this application can be obtained as shown in Table 12 below.

[0338] Table 12 Partial parameters of the camera module 300 in the fourth embodiment.

[0339] It is understood that the setting range of the relevant optical parameters in this embodiment can be referred to the setting range of the relevant optical parameters in the first embodiment.

[0340] The back focal length RBL of the mirror group 1 (which is the sum of the absolute values ​​of the thicknesses of S4 and S18 in Table 10) and the focal length EFL of the optical lens 10 satisfy the following ratio: RBL / EFL = 0.51. It can be understood that by limiting the ratio of the back focal length RBL of the mirror group 1 to the focal length EFL of the optical lens 10 to 0.51, it ensures that the interior of the mirror group 1 has space where light can undergo at least two reflections, and that the optical lens 10 has sufficient space to arrange the lens group 2, resulting in a high magnification of the optical lens 10 and good super-telephoto shooting performance.

[0341] The distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction, and the height LH of the camera module 300 satisfy: LEL / LH = 0.75. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction to the height LH of the camera module 300 to 0.75, the height of the camera module 300 can be reduced, which is beneficial for reducing the shoulder height of the camera module 300, thereby facilitating the miniaturization of the camera module 300.

[0342] The distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction (at least a portion of which is arranged along the first direction), and the total system optical length TTL of the camera module 300 satisfy the following condition: LEL / TTL = 0.27. It is understood that by limiting the ratio of the distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction to the total system optical length TTL of the camera module 300 to 0.27, the height of the optical lens 10 and the camera module 300 is reduced, which helps to reduce the shoulder height of the optical lens 10 and the camera module 300, thereby facilitating the miniaturization of the optical lens 10 and the camera module 300.

[0343] The thickness CTR of the mirror group 1 and the maximum light transmission diameter LD of the area through which light passes through the object side 1c of the mirror group 1 satisfy the condition: CTR / LD = 0.30. It can be understood that by limiting the ratio of the thickness CTR of the mirror group 1 to the maximum light transmission diameter LD of the area through which light passes through the object side 1c of the mirror group 1 to 0.30, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0344] Specifically, the maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 and the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 satisfy the condition: LD / LRD = 4.00. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 to the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 to 4.00, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0345] The height HP of the folding element 3, the image height IH of the optical lens 10, and the angle PA of the minimum acute angle inside the folding element 3 satisfy: HP - 1.25 × IH × tan(PA) = 0.32. It can be understood that by limiting HP - 1.25 × IH × tan(PA) to 0.32, it is beneficial to fold the optical path, thereby reducing the size of the optical lens 10 and facilitating its miniaturization.

[0346] In other embodiments, the form of the minimum acute angle inside the folding element 3 is not limited to the sharp angle shown in FIG14. For example, the minimum acute angle inside the folding element 3 can be rounded or ground into a flat surface according to actual needs. This application does not limit the specific implementation.

[0347] Specifically, the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 and the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 satisfy the condition: LD / RD = 3.64. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 to the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 to 3.64, the light reflected by the mirror group 1 is reduced, while simultaneously intercepting the light and correcting off-axis aberrations.

[0348] Specifically, the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 satisfies the ratio of DOR / IH of the optical lens 10 to 1.83. It can be understood that by limiting the ratio of the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 to the image height IH of the optical lens 10 to 1.83, the obstruction of on-axis light rays is reduced, light loss is decreased, thereby improving the imaging quality of the optical lens 10.

[0349] Figure 15 is a simulation effect diagram of the telephoto end of the camera module 300 in the fourth embodiment.

[0350] As shown in Figure 15, when the camera module 300 is at the telephoto end, the normalized coordinates of the camera module 300 are all small, the axial chromatic aberration (spherical aberration, chromatic aberration, etc.) correction of the camera module 300 is good, and the imaging quality of the camera module 300 is high.

[0351] Figure 16 is a simulation effect diagram of the telephoto end of the camera module 300 in the fourth embodiment.

[0352] As shown in Figure 16, when the camera module 300 is at the telephoto end, the field curvature in both directions is small, the camera module 300 has a good depth of focus, and the imaging quality of the camera module 300 is high.

[0353] Figure 17 is a simulation effect diagram of the telephoto end of the camera module 300 in the fourth embodiment.

[0354] As shown in Figure 17, when the camera module 300 is at the telephoto end, the optical distortion ratio of the camera module 300 at different image heights is less than 1%, which can ensure that there is no obvious distortion in the image, the degree of optical distortion of the image is small, and the imaging quality of the camera module 300 is high.

[0355] Fifth implementation: Please refer to Figure 18, which is a simplified schematic diagram of part of the structure of the camera module 300 shown in Figure 1B in another implementation.

[0356] In this embodiment, the camera module 300 includes a mirror group 1, a lens group 2, a folding element 3, a filter 30, and an image sensor 20 arranged sequentially from the object side to the image side.

[0357] For example, the mirror assembly 1 includes a first reflecting lens 11, and the exit surface 1b of the mirror assembly 1 may be located in the fourth sub-region 114 of the image side surface 11b of the first reflecting lens 11.

[0358] For example, after light enters the first reflecting lens 11, it undergoes a first reflection on the third sub-region 113 of the image side 11b of the first reflecting lens 11, a second reflection on the second sub-region 112 of the object side 11a of the first reflecting lens 11, and then exits the first reflecting lens 11 from the fourth sub-region 114 of the image side 11b of the first reflecting lens 11 and enters the lens group 2.

[0359] It is understood that the second sub-region 112 of the object-side surface 11a of the first reflecting lens 11 can be the reflecting surface closest to the object side of the mirror assembly 1. The second sub-region 112 of the object-side surface 11a of the first reflecting lens 11 can be the second reflecting surface 1f of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the second reflecting surface 1f of the mirror assembly 1.

[0360] It is understood that the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 can be the reflecting surface closest to the image side of the mirror assembly 1. The third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 can be the first reflecting surface 1e of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the first reflecting surface 1e of the mirror assembly 1.

[0361] For example, the lens group 2 may include an optical switching element 24 and one or more lenses, one or more lenses being located on the image side of the optical switching element 24. The optical switching element 24 can be used to change the optical axis of the first direction to the second direction, and the first direction and the second direction may be different.

[0362] It is understandable that the optical switching element 24 changes the optical axis from the first direction to the second direction, which can reduce the height of the optical lens 10 in the first direction, which is beneficial to reducing the shoulder height of the optical lens 10 and to achieving a miniaturized optical lens 10.

[0363] For example, the lens group 2 may include three lenses, including an optical path element 24, a first lens 21, a second lens 22 and a third lens 23 arranged sequentially from the object side to the image side.

[0364] For example, the optical converter element 24 includes an incident surface 241, an exit surface 242, and a reflecting surface 243. The incident surface 241 of the optical converter element 24 is connected to the exit surface 242 of the optical converter element 24, and the reflecting surface 243 of the optical converter element 24 is connected to the incident surface 241 and the exit surface 242 of the optical converter element 24. The incident surface 241 of the optical converter element 24 can be disposed facing the exit surface 1b of the mirror assembly 1, and the exit surface 242 of the optical converter element 24 can be disposed facing one or more lenses. That is, the exit surface 242 of the optical converter element 24 can be disposed facing the first lens 21.

[0365] For example, light passing through the first reflecting lens 11 enters the light-transfer element 24 through the incident surface 241 of the light-transfer element 24, is reflected on the reflecting surface 243 of the light-transfer element 24, and then exits the light-transfer element 24 through the exit surface 242 of the light-transfer element 24 and enters the first lens 21.

[0366] Understandably, the optical path conversion element 24 can cooperate with the mirror group 1 and the folding element 3 to further increase the total length of the optical path, thereby further facilitating telephoto shooting of the optical lens 10. In addition, since the optical path conversion element 24 increases the total length of the optical path through reflection, the overall physical length and height of the optical lens 10 can be kept relatively short, which is beneficial to reducing the height of the optical lens 10, thereby achieving a miniaturized design of the optical lens 10.

[0367] For example, the cross-section of the folding element 3 is approximately triangular. The folding element 3 includes a first surface 37, a second surface 38, and a reflecting surface 39. The first surface 37 of the folding element 3 is connected to the second surface 38, and the reflecting surface of the folding element 3 connects the first surface 37 and the second surface 38. The incident surface 33 of the folding element 3 may be located on the first surface 37, and the exit surface 34 of the folding element 3 may be located on the second surface 38. After light enters the folding element 3, it is reflected on the second surface 38 and the reflecting surface 39. In one embodiment, a first reflection occurs on the second surface 38 of the folding element 3, and a second reflection occurs on the reflecting surface 39.

[0368] Understandably, light can undergo multiple reflections on the second surface 38 and the reflecting surface 39 of the folding element 3, thereby increasing the total length of the optical path. The folding element 3 can cooperate with the reflecting mirror group 1 to further increase the total length of the optical path, which is more conducive to achieving telephoto shooting with the optical lens 10. In addition, since the folding element 3 increases the total length of the optical path through reflection, the overall physical length and height of the optical lens 10 can be kept relatively short, and the overall optical length of the camera module 300 is less likely to increase significantly, which is beneficial to reducing the height of the optical lens 10, thereby achieving a miniaturized design of the optical lens 10.

[0369] For example, by moving the image sensor 20, or the optical lens 10, or the first lens 21, the second lens 22 and the third lens 23 of the lens group 2, or the folding element 3, the camera module 300 can achieve automatic focusing and improve the imaging quality of the camera module 300.

[0370] Some design parameters of the camera module 300 in the fifth embodiment of this application are shown in Table 13 below.

[0371] Table 13 shows partial design parameters of each component of the camera module 300 in the fifth embodiment.

[0372] It is understood that in Table 13, OBJ can represent the object-side surface of the optical lens 10; STO can represent the aperture stop (not shown in the attached figures); S1 can represent the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11; S2 can represent the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11; S3 can represent the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11; S4 can represent the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11; S5 can represent the incident surface 241 of the optical transducer element 24; S6 can represent the reflecting surface 243 of the optical transducer element 24; S7 ... The light-emitting surface 242 of the light-transfer element 24; S8 and S9 can represent the object-side surface and image-side surface of the first lens 21, respectively; S10 and S11 can represent the object-side surface and image-side surface of the second lens 22, respectively; S12 and S13 can represent the object-side surface and image-side surface of the third lens 23, respectively; S14 can represent the first surface 37 of the folding element 3; S15 can represent the second surface 38 of the folding element 3; S16 can represent the reflecting surface 39 of the folding element 3; S17 can represent the second surface 38 of the folding element 3; S18 and S19 can represent the object-side surface and image-side surface of the filter 30, respectively; S20 can represent the imaging surface of the camera module.

[0373] Additionally, the thickness of OBJ refers to the distance between the object being photographed and the object-side surface of the optical lens 10. The thickness of S1 refers to the distance between the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11 and the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11. The thickness of S2 refers to the distance between the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 and the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11. The thickness of S3 refers to the distance between the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11 and the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11. The thickness of S4 refers to the distance between the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11 and the incident surface 241 of the optical converter element 24. The thickness of S5 refers to the distance between the incident surface 241 of the optical converter element 24 and the reflecting surface 243 of the optical converter element 24. The thickness of S6 refers to the distance between the reflecting surface 243 and the emitting surface 242 of the optical converter element 24. The thickness of S7 refers to the distance between the emitting surface 242 of the optical converter element 24 and the object-side surface of the first lens 21. The thickness of S8 refers to the distance between the object-side surface and the image-side surface of the first lens 21. The thickness of S9 refers to the distance between the image-side surface of the first lens 21 and the object-side surface of the second lens 22. The thickness of S10 refers to the distance between the object-side surface and the image-side surface of the second lens 22. The thickness of S11 refers to the distance between the image-side surface of the second lens 22 and the object-side surface of the third lens 23. The thickness of S12 refers to the distance between the object-side surface and the image-side surface of the third lens 23. The thickness of S13 refers to the distance between the image-side surface of the third lens 23 and the first surface 37 of the folding element 3. The thickness of S14 refers to the distance between the first surface 37 and the second surface 38 of the folding element 3. The thickness of S15 refers to the distance between the second surface 38 of the folding element 3 and the reflective surface 39 of the folding element 3. The thickness of S16 refers to the distance between the reflective surface 39 of the folding element 3 and the second surface 38 of the folding element 3. The thickness of S17 refers to the distance between the second surface 38 of the folding element 3 and the object-side surface of the filter 30. The thickness of S18 refers to the distance between the object-side surface of the filter 30 and the image-side surface of the filter 30. The thickness of S19 refers to the distance between the image-side surface of the filter 30 and the object-side surface of the image sensor 20. S20 refers to the distance between the object-side surface of the image sensor 20 and the imaging surface.

[0374] Among them, the optical lens 10 satisfies: FOV = 8.1°. It can be understood that by limiting the full field of view (FOV) of the optical lens 10 to 8.1°, distortion and falsification at the image edges are reduced or avoided. Moreover, the optical lens 10 has a smaller full field of view (FOV), a smaller field of view, and a larger optical magnification, which can better meet the ultra-telephoto design of the optical lens 10.

[0375] Among them, the folding element 3 satisfies: Vd = 42.7. It can be understood that the folding element 3 has a large Abbe number, which can reduce the chromatic aberration and dispersion problems in the optical lens 10, and can better correct chromatic aberration and dispersion, resulting in higher resolution and clearer image quality of the optical lens 10.

[0376] Furthermore, the aspherical coefficients of each element of the camera module 300 in the fifth embodiment of this application are shown in Table 14 below.

[0377] Table 14 Aspheric coefficients of various components of the camera module 300 in the fifth embodiment

[0378] It is understandable that, among the 13 aspherical surfaces of the camera module 300 shown in Tables 13 and 14, all even-order and odd-order aspherical surface shapes z can be limited using, but are not limited to, the following aspherical formulas:

[0379] Where z(x,y) is the optical surface sagitta; k is the conic coefficient; c is the radius of curvature; r is the radius height along the optical axis; r 2 =x 2 +y 2 ;α i These are the polynomial coefficients; r i These are standardized radial coordinates. By substituting the design parameters of the first reflecting lens 11, the first lens 21, the second lens 22, and the third lens 23 of the optical lens 10 into the above aspherical formula, the object-side and image-side surface shapes of the first reflecting lens 11, the first lens 21, the second lens 22, and the third lens 23 of the camera module 300 in the fifth embodiment of this application can be obtained.

[0380] Based on the data in Tables 13 and 14, some parameters of the camera module 300 in the fifth embodiment of this application can be obtained as shown in Table 15 below.

[0381] Table 15 Partial parameters of the camera module 300 in the fifth embodiment.

[0382] It is understood that the setting range of the relevant optical parameters in this embodiment can be referred to the setting range of the relevant optical parameters in the first embodiment.

[0383] Specifically, the back focal length RBL of the mirror group 1 (which is the sum of the absolute values ​​of the thicknesses of S7 to S19 in Table 13) and the focal length EFL of the optical lens 10 satisfy the following condition: RBL / EFL = 0.50. It can be understood that by limiting the ratio of the back focal length RBL of the mirror group 1 to the focal length EFL of the optical lens 10 to 0.50, it ensures that the interior of the mirror group 1 has space where light can undergo at least two reflections, and that the optical lens 10 has sufficient space to arrange the lens group 2, resulting in a high magnification of the optical lens 10 and good super-telephoto shooting performance.

[0384] Specifically, the distance LEL between the object-side surface 1c and the image-side surface 1d of the reflector group 1 and the height LH of the camera module 300 satisfy the condition: LEL / LH = 0.46. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c and the image-side surface 1d of the reflector group 1 to the height LH of the camera module 300 to 0.46, the height of the camera module 300 can be reduced, which is beneficial for reducing the shoulder height of the camera module 300 and thus facilitating the miniaturization of the camera module 300.

[0385] The distance LEL between the object-side surface 1c and the image-side surface 1d of the mirror group 1 and the total system optical length TTL of the camera module 300 satisfy the following condition: LEL / TTL = 0.21. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c and the image-side surface 1d of the mirror group 1 to the total system optical length TTL of the camera module 300 to 0.21, the height of the optical lens 10 and the camera module 300 is reduced, which helps to reduce the shoulder height of the optical lens 10 and the camera module 300, thereby facilitating the miniaturization of the optical lens 10 and the camera module 300.

[0386] The thickness CTR of the mirror group 1 and the maximum light transmission diameter LD of the area through which light passes on the object side 1c of the mirror group 1 satisfy the condition: CTR / LD = 0.29. It can be understood that by limiting the ratio of the thickness CTR of the mirror group 1 to the maximum light transmission diameter LD of the area through which light passes on the object side 1c of the mirror group 1 to 0.29, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0387] The maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 and the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 satisfy the following ratio: LD / LRD = 3.23. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 to the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 to 3.23, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0388] The height HP of the folding element 3, the image height IH of the optical lens 10, and the angle PA of the minimum acute angle inside the folding element 3 satisfy: HP - 1.25 × IH × tan(PA) = 3.36. It can be understood that by limiting HP - 1.25 × IH × tan(PA) to 3.36, it is beneficial to fold the optical path, thereby reducing the size of the optical lens 10 and facilitating its miniaturization.

[0389] In other embodiments, the form of the minimum acute angle inside the folding element 3 is not limited to the sharp angle shown in FIG18. For example, the minimum acute angle inside the folding element 3 can be rounded or ground into a flat surface according to actual needs. This application does not limit the specific implementation.

[0390] Specifically, the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 and the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 satisfy the condition: LD / RD = 2.63. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 to the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 to 2.63, the light reflected by the mirror group 1 is reduced, while simultaneously intercepting the light and correcting off-axis aberrations.

[0391] Specifically, the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 satisfies the ratio of DOR / IH of the optical lens 10 to 1.76. It can be understood that by limiting the ratio of the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 to the image height IH of the optical lens 10 to 1.76, the obstruction of on-axis light rays is reduced, light loss is decreased, thereby improving the imaging quality of the optical lens 10.

[0392] Figure 19 is a simulation effect diagram of the telephoto end of the camera module 300 in the fifth embodiment.

[0393] As shown in Figure 19, when the camera module 300 is at the telephoto end, the normalized coordinates of the camera module 300 are all small, the axial chromatic aberration (spherical aberration, chromatic aberration, etc.) correction of the camera module 300 is better, and the imaging quality of the camera module 300 is high.

[0394] Figure 20 is a simulation effect diagram of the telephoto end of the camera module 300 in the fifth embodiment.

[0395] As shown in Figure 20, when the camera module 300 is at the telephoto end, the field curvature in both directions is small, the camera module 300 has a good depth of focus, and the imaging quality of the camera module 300 is high.

[0396] Figure 21 is a simulation effect diagram of the telephoto end of the camera module 300 in the fifth embodiment.

[0397] As shown in Figure 21, when the camera module 300 is at the telephoto end, the optical distortion ratio of the camera module 300 at different image heights is less than 2%, which can ensure that there is no obvious distortion in the image, the degree of optical distortion of the image is small, and the imaging quality of the camera module 300 is high.

[0398] Sixth implementation: Please refer to Figure 22, which is a simplified schematic diagram of part of the structure of the camera module 300 shown in Figure 1B in another implementation.

[0399] In this embodiment, the camera module 300 includes a mirror group 1, a lens group 2, a filter 30, and an image sensor 20 arranged sequentially from the object side to the image side.

[0400] For example, the mirror assembly 1 includes a first reflecting lens 11, and the exit surface 1b of the mirror assembly 1 may be located in the fourth sub-region 114 of the image side surface 11b of the first reflecting lens 11.

[0401] For example, after light enters the first reflecting lens 11, it undergoes a first reflection on the third sub-region 113 of the image side 11b of the first reflecting lens 11, a second reflection on the second sub-region 112 of the object side 11a of the first reflecting lens 11, and then exits the first reflecting lens 11 from the fourth sub-region 114 of the image side 11b of the first reflecting lens 11 and enters the lens group 2.

[0402] It is understood that the second sub-region 112 of the object-side surface 11a of the first reflecting lens 11 can be the reflecting surface closest to the object side of the mirror assembly 1. The second sub-region 112 of the object-side surface 11a of the first reflecting lens 11 can be the second reflecting surface 1f of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the second reflecting surface 1f of the mirror assembly 1.

[0403] It is understood that the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 can be the reflecting surface closest to the image side of the mirror assembly 1. The third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 can be the first reflecting surface 1e of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the first reflecting surface 1e of the mirror assembly 1.

[0404] For example, the lens group 2 may include a first lens 21 and an optical switching element 24. The first lens 21 may be located on the image side of the optical switching element 24. The optical switching element 24 includes an incident surface 241, an exit surface 242, and a reflecting surface 243. The incident surface 241 of the optical switching element 24 is connected to the exit surface 242 of the optical switching element 24, and the reflecting surface 243 of the optical switching element 24 is connected to both the incident surface 241 and the exit surface 242 of the optical switching element 24. The exit surface 1b of the mirror group 1 may be disposed facing the incident surface 241 of the optical switching element 24, and the exit surface 242 of the optical switching element 24 may face the first lens 21.

[0405] For example, light rays passing through the first reflecting lens 11 enter the optical converter element 24 through the incident surface 241 of the optical converter element 24. After being reflected on the reflecting surface 243 of the optical converter element 24, the optical converter element 24 can be used to change the optical axis of the first direction to the second direction. The light rays exit the optical converter element 24 through the exit surface 242 of the optical converter element 24 and enter the first lens 21. The first direction and the second direction can be different.

[0406] It is understandable that the optical switching element 24 changes the optical axis from the first direction to the second direction, which can reduce the height of the optical lens 10 in the first direction, which is beneficial to reducing the shoulder height of the optical lens 10 and to achieving a miniaturized optical lens 10.

[0407] Understandably, the optical path conversion element 24 can cooperate with the mirror group 1 and the folding element 3 to further increase the total length of the optical path, thereby further facilitating telephoto shooting of the optical lens 10. In addition, since the optical path conversion element 24 increases the total length of the optical path through reflection, the overall physical length and height of the optical lens 10 can be kept relatively short, which is beneficial to reducing the height of the optical lens 10, thereby achieving a miniaturized design of the optical lens 10.

[0408] For example, the lens group 2 may also include a second lens 22 and a third lens 23. The lens group 2 may include an optical path element 24, a first lens 21, a second lens 22 and a third lens 23 arranged sequentially from the object side to the image side.

[0409] For example, by moving the image sensor 20, or the optical lens 10, or the first lens 21, the second lens 22 and the third lens 23 of the lens group 2, or the folding element 3, the camera module 300 can achieve automatic focusing and improve the imaging quality of the camera module 300.

[0410] Some design parameters of the camera module 300 in the sixth embodiment of this application are shown in Table 16 below.

[0411] Table 16 shows partial design parameters of each component of the camera module 300 in the sixth embodiment.

[0412] It is understood that in Table 16, OBJ can represent the object-side surface of the optical lens 10; STO can represent the aperture stop (not shown in the attached figures); S1 can represent the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11; S2 can represent the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11; S3 can represent the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11; S4 can represent the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11; and S5 can represent the optical path. S6 can represent the incident surface 241 of the optical transducer element 24; S7 can represent the reflecting surface 243 of the optical transducer element 24; S8 and S9 can represent the object-side surface and image-side surface of the first lens 21, respectively; S10 and S11 can represent the object-side surface and image-side surface of the second lens 22, respectively; S12 and S13 can represent the object-side surface and image-side surface of the third lens 23, respectively; S14 and S15 can represent the object-side surface and image-side surface of the filter 30, respectively; S16 can represent the imaging surface of the camera module.

[0413] Additionally, the thickness of OBJ refers to the distance between the object being photographed and the object-side surface of the optical lens 10. The thickness of S1 refers to the distance between the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11 and the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11. The thickness of S2 refers to the distance between the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 and the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11. The thickness of S3 refers to the distance between the second sub-region 112 of the image-side surface 11b of the first reflecting lens 11 and the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11. The thickness of S4 refers to the distance between the fourth sub-region 114 of the image-side surface 11b of the first reflecting lens 11 and the incident surface 241 of the optical converter element 24. The thickness of S5 refers to the distance between the incident surface 241 of the optical converter element 24 and the reflecting surface 243 of the optical converter element 24. The thickness of S6 refers to the distance between the reflecting surface 243 and the emitting surface 242 of the optical converter element 24. The thickness of S7 refers to the distance between the emitting surface 242 of the optical converter element 24 and the object-side surface of the first lens 21. The thickness of S8 refers to the distance between the object-side surface and the image-side surface of the first lens 21. The thickness of S9 refers to the distance between the image-side surface of the first lens 21 and the object-side surface of the second lens 22. The thickness of S10 refers to the distance between the object-side surface and the image-side surface of the second lens 22. The thickness of S11 refers to the distance between the image-side surface of the second lens 22 and the object-side surface of the third lens 23. The thickness of S12 refers to the distance between the object-side surface and the image-side surface of the third lens 23. The thickness of S13 refers to the distance between the image-side surface of the third lens 23 and the object-side surface of the filter 30. The thickness of S14 refers to the distance between the object-side surface and the image-side surface of the filter 30. The thickness of S15 refers to the distance between the image side of the filter 30 and the object side of the image sensor 20. S16 refers to the distance between the object side of the image sensor 20 and the imaging surface.

[0414] Among them, the optical lens 10 satisfies: FOV = 13.4°. It can be understood that by limiting the full field of view (FOV) of the optical lens 10 to 13.4°, distortion and falsification at the image edges are reduced or avoided. Moreover, the optical lens 10 has a smaller full field of view (FOV), a smaller field of view, and a larger optical magnification, which can better meet the ultra-telephoto design requirements of the optical lens 10.

[0415] Furthermore, the aspherical coefficients of each element of the camera module 300 in the sixth embodiment of this application are shown in Table 17 below.

[0416] Table 17 Aspheric coefficients of various components of the camera module 300 in the sixth embodiment

[0417] It is understandable that, among the 12 aspherical surfaces of the camera module 300 shown in Tables 16 and 17, all even-order and odd-order aspherical surface shapes z can be defined using, but are not limited to, the following aspherical formulas:

[0418] Where z(x,y) is the optical surface sagitta; k is the conic coefficient; c is the radius of curvature; r is the radius height along the optical axis; r 2 =x 2 +y 2 ;α i These are the polynomial coefficients; r i These are standardized radial coordinates. By substituting the design parameters of the first reflecting lens 11, the first lens 21, the second lens 22, and the third lens 23 of the optical lens 10 into the above aspherical formula, the object-side and image-side surface shapes of the first reflecting lens 11, the first lens 21, the second lens 22, and the third lens 23 of the camera module 300 in the sixth embodiment of this application can be obtained.

[0419] Based on the data in Tables 16 and 17, some parameters of the camera module 300 in the sixth embodiment of this application can be obtained as shown in Table 18 below.

[0420] Table 18. Partial parameters of the camera module 300 in the sixth embodiment.

[0421] It is understood that the setting range of the relevant optical parameters in this embodiment can be referred to the setting range of the relevant optical parameters in the first embodiment.

[0422] The back focal length RBL of the mirror group 1 (which is the sum of the absolute values ​​of the thicknesses of S7 and S15 in Table 16) and the focal length EFL of the optical lens 10 satisfy the following ratio: RBL / EFL = 0.42. It can be understood that by limiting the ratio of the back focal length RBL of the mirror group 1 to the focal length EFL of the optical lens 10 to 0.42, it ensures that the interior of the mirror group 1 has space where light can undergo at least two reflections, and that the optical lens 10 has sufficient space to arrange the lens group 2, resulting in a high magnification of the optical lens 10 and good super-telephoto shooting performance.

[0423] Specifically, the distance LEL between the object-side surface 1c and the image-side surface 1d of the reflector group 1 and the height LH of the camera module 300 satisfy the condition: LEL / LH = 0.44. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c and the image-side surface 1d of the reflector group 1 to the height LH of the camera module 300 to 0.44, the height of the camera module 300 can be reduced, which is beneficial for reducing the shoulder height of the camera module 300 and thus facilitating the miniaturization of the camera module 300.

[0424] The distance LEL between the object-side surface 1c and the image-side surface 1d of the mirror group 1 and the total system optical length TTL of the camera module 300 satisfy the following condition: LEL / TTL = 0.17. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c and the image-side surface 1d of the mirror group 1 to the total system optical length TTL of the camera module 300 to 0.17, the height of the optical lens 10 and the camera module 300 is reduced, which helps to reduce the shoulder height of the optical lens 10 and the camera module 300, thereby facilitating the miniaturization of the optical lens 10 and the camera module 300.

[0425] The thickness CTR of the mirror group 1 and the maximum light transmission diameter LD of the area through which light passes through the object side 1c of the mirror group 1 satisfy the following condition: CTR / LD = 0.31. It can be understood that by limiting the ratio of the thickness CTR of the mirror group 1 to the maximum light transmission diameter LD of the area through which light passes through the object side 1c of the mirror group 1 to 0.31, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0426] The maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 and the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 satisfy the following ratio: LD / LRD = 3.18. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 to the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 to 3.18, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0427] Specifically, the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 and the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 satisfy the condition: LD / RD = 2.41. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 to the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 to 2.41, the light reflected by the mirror group 1 is reduced, while simultaneously intercepting the light and correcting off-axis aberrations.

[0428] Specifically, the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 satisfies the ratio of DOR / IH of the optical lens 10 to 1.83. It can be understood that by limiting the ratio of the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 to the image height IH of the optical lens 10 to 1.83, the obstruction of on-axis light rays is reduced, light loss is decreased, thereby improving the imaging quality of the optical lens 10.

[0429] Figure 23 is a simulation effect diagram of the telephoto end of the camera module 300 in the sixth embodiment.

[0430] As shown in Figure 23, when the camera module 300 is at the telephoto end, the normalized coordinates of the camera module 300 are all small, the axial chromatic aberration (spherical aberration, chromatic aberration, etc.) correction of the camera module 300 is better, and the imaging quality of the camera module 300 is higher.

[0431] Figure 24 is a simulation effect diagram of the telephoto end of the camera module 300 in the sixth embodiment.

[0432] As shown in Figure 24, when the camera module 300 is at the telephoto end, the field curvature in both directions is small, the camera module 300 has a good depth of focus, and the imaging quality of the camera module 300 is high.

[0433] Figure 25 is a simulation effect diagram of the telephoto end of the camera module 300 in the sixth embodiment.

[0434] As shown in Figure 25, when the camera module 300 is at the telephoto end, the optical distortion ratio of the camera module 300 at different image heights is less than 2.5%, which can ensure that there is no obvious distortion in the image, the degree of optical distortion of the image is small, and the imaging quality of the camera module 300 is high.

[0435] Seventh implementation: Please refer to Figure 26, which is a simplified schematic diagram of part of the structure of the camera module 300 shown in Figure 1B in another implementation.

[0436] In this embodiment, the camera module 300 includes a mirror group 1, a lens group 2, a folding element 3, a filter 30, and an image sensor 20 arranged sequentially from the object side to the image side.

[0437] For example, the mirror assembly 1 includes a first reflecting lens 11 and a second reflecting lens 12, and the exit surface 1b of the mirror assembly 1 is located in the eighth sub-region 124 of the image side surface 12b of the second reflecting lens 12.

[0438] For example, after light enters the first reflecting lens 11, it exits the first reflecting lens 11 through the transmission area of ​​the third sub-region 113, and enters the second reflecting lens 12 through the transmission area of ​​the fifth sub-region 121. After the first reflection occurs in the reflection area of ​​the seventh sub-region 123, the light exits the second reflecting lens 12 through the transmission area of ​​the fifth sub-region 121, and enters the first reflecting lens 11 through the transmission area of ​​the third sub-region 113. After the second reflection occurs in the reflection area of ​​the second sub-region 112, the light exits the second reflecting lens 12 through the eighth sub-region 124 of the image side 12b, and enters the lens group 2.

[0439] It is understood that the second sub-region 112 of the object side surface 11a of the first reflecting lens 11 can be the reflecting surface closest to the object side of the mirror assembly 1, and the second sub-region 112 of the object side surface 11a of the first reflecting lens 11 can be the second reflecting surface 1f of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the second reflecting surface 1f of the mirror assembly 1.

[0440] It is understood that the seventh sub-region 123 of the image-side surface 12b of the second reflecting lens 12 can be the reflecting surface closest to the image side of the mirror assembly 1. The seventh sub-region 123 of the image-side surface 12b of the second reflecting lens 12 can be the first reflecting surface 1e of the mirror assembly 1. In other embodiments, when the mirror assembly 1 adopts other structures, other regions of the mirror assembly 1 can also be the first reflecting surface 1e of the mirror assembly 1.

[0441] In this embodiment, light can be reflected once in the first reflecting lens 11 and once in the second reflecting lens 12. Light can enter the interior of the first reflecting lens 11 through the first sub-region 111 of the object side 11a of the first reflecting lens 11, and exit the first reflecting lens 11 through the transmission region of the third sub-region 113. It can also enter the interior of the second reflecting lens 12 through the fifth sub-region 121 of the object side 12a of the second reflecting lens 12, be reflected in the reflection region of the seventh sub-region 123, and exit the second reflecting lens 12 through the transmission region of the sixth sub-region 122. Then, it can enter the interior of the first reflecting lens 11 through the fourth sub-region 114 of the image side 11b of the first reflecting lens 11, be reflected in the reflection region of the second sub-region 112, and exit the first reflecting lens 11 through the transmission portion of the fourth sub-region 114. Then, it can enter the interior of the second reflecting lens 12 through the sixth sub-region 122 of the object side 12a of the second reflecting lens 12, and exit the second reflecting lens 12 through the transmission region of the eighth sub-region 124, and enter the lens group 2.

[0442] For example, the lens group 2 has two lenses. The optical lens 10 includes a first lens 21 and a second lens 22 arranged sequentially from the object side to the image side.

[0443] For example, the folding element 3 may include a first sub-folding element 3a and a second sub-folding element 3b, and the first sub-folding element 3a and the second sub-folding element 3b may be fixedly connected.

[0444] For example, the first sub-folding element 3a includes a first surface 31a, a second surface 32a and a reflective surface 33a. The first surface 31a of the first sub-folding element 3a can be connected to the second surface 32a and the reflective surface 33a of the first sub-folding element 3a. The first surface 31a of the first sub-folding element 3a can be arranged facing the lens group 2. The incident surface 33 of the folding element 3 can be located on the first surface 31a of the first sub-folding element 3a.

[0445] For example, the second sub-folding element 3b includes a first surface 31b, a second surface 32b, and a reflective surface 33b. The second surface 32b of the second sub-folding element 3b can be connected to the first surface 31b of the second sub-folding element 3b and the reflective surface 33b of the second sub-folding element 3b. The first surface 31b of the second sub-folding element 3b can be disposed facing the second surface 32a of the first sub-folding element 3a. The emission surface 34 of the folding element 3 can be located on the second surface 32b of the second sub-folding element 3b.

[0446] After light enters the folding element 3, it is reflected on the second surface 32a, the reflecting surface 33a, and the first surface 31a of the first sub-folding element 3a. The light then exits the first sub-folding element 3a through the second surface 32a and enters the second sub-folding element 3b through the first surface 31b. It is then reflected on the reflecting surface 33b and the first surface 31b of the second sub-folding element 3b. In one embodiment, a first reflection occurs on the second surface 32a of the first sub-folding element 3a, a second reflection occurs on the reflective surface 33a of the first sub-folding element 3a, a third reflection occurs on the first surface 31a of the first sub-folding element 3a, the first sub-folding element 3a exits from the second surface 32a and enters the second sub-folding element 3b from the first surface 31b, a fourth reflection occurs on the reflective surface 33b of the second sub-folding element 3b, and a fifth reflection occurs on the first surface 31b of the second sub-folding element 3b.

[0447] Understandably, light can undergo multiple reflections on the first surface 31a of the first sub-folding element 3a, the second surface 32a of the first sub-folding element 3a, the reflecting surface 33a of the first sub-folding element 3a, the first surface 31b of the second sub-folding element 3b, and the reflecting surface 33b of the second sub-folding element 3b, thereby increasing the total length of the optical path. The folding element 3 can cooperate with the mirror group 1 to further increase the total length of the optical path, which is more conducive to achieving telephoto end shooting of the optical lens 10. In addition, since the folding element 3 increases the total length of the optical path through reflection, the overall physical length and height of the optical lens 10 can be kept relatively short, and the overall optical length of the camera module 300 is not likely to increase significantly, which is conducive to reducing the height of the optical lens 10, thereby achieving a miniaturized design of the optical lens 10.

[0448] For example, by moving the image sensor 20, or the optical lens 10, or the first lens 21 and the second lens 22 of the lens group 2, or the folding element 3, the camera module 300 can achieve autofocus and improve the imaging quality of the camera module 300.

[0449] Some design parameters of the camera module 300 in the seventh embodiment of this application are shown in Table 19 below.

[0450] Table 19 shows partial design parameters of each component of the camera module 300 in the seventh embodiment.

[0451] It is understood that in Table 19, OBJ can represent the object-side surface of the optical lens 10; STO can represent the aperture stop (not shown in the attached figures); S1 can represent the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11; S2 can represent the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11; S3 can represent the fifth sub-region 121 of the object-side surface 12a of the second reflecting lens 12; and S4 can represent the seventh sub-region of the image-side surface 12b of the second reflecting lens 12. 123; S5 can represent the fifth sub-region 121 of the object side 12a of the second reflecting lens 12; S6 can represent the third sub-region 113 of the image side 11b of the first reflecting lens 11; S7 can represent the second sub-region 112 of the image side 11b of the first reflecting lens 11; S8 can represent the fourth sub-region 114 of the image side 11b of the first reflecting lens 11; S9 can represent the sixth sub-region 122 of the object side 12a of the second reflecting lens 12; S10 can represent the second reflecting lens... The eighth sub-region 124 of the image side surface 12b of the first lens 21; S11 and S12 can represent the object side surface and image side surface of the first lens 21, respectively; S13 and S14 can represent the object side surface and image side surface of the second lens 22, respectively; S15 can represent the first surface 31a of the first sub-folding element 3a; S16 can represent the second surface 32a of the first sub-folding element 3a; S17 can represent the reflecting surface 33a of the first sub-folding element 3a; S18 can represent the first surface of the first sub-folding element 3a. 31a; S19 can represent the second surface 32a of the first sub-folding element 3a; S20 can represent the first surface 31b of the second sub-folding element 3b; S21 can represent the reflecting surface 33b of the second sub-folding element 3b; S22 can represent the first surface 31b of the second sub-folding element 3b; S23 can represent the second surface 32b of the second sub-folding element 3b; S24 and S25 can represent the object side and image side of the filter 30, respectively; S26 can represent the imaging surface of the camera module.

[0452] Additionally, the thickness of OBJ refers to the distance between the object being photographed and the object-side surface of the optical lens 10. The thickness of STO refers to the distance between the object-side surface and the image-side surface of the aperture. The thickness of S1 refers to the distance between the first sub-region 111 of the object-side surface 11a of the first reflecting lens 11 and the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11. The thickness of S2 refers to the distance between the third sub-region 113 of the image-side surface 11b of the first reflecting lens 11 and the fifth sub-region 121 of the object-side surface 12a of the second reflecting lens 12. The thickness of S3 refers to the distance between the fifth sub-region 121 of the object-side surface 12a of the second reflecting lens 12 and the seventh sub-region 123 of the image-side surface 12b of the second reflecting lens 12. The thickness of S4 refers to the distance between the seventh sub-region 123 of the image-side surface 12b of the second reflecting lens 12 and the fifth sub-region 121 of the object-side surface 12a of the second reflecting lens 12. The thickness of S5 refers to the distance between the fifth sub-region 121 of the object side surface 12a of the second reflecting lens 12 and the fourth sub-region 114 of the image side surface 11b of the first reflecting lens 11. The thickness of S6 refers to the distance between the fourth sub-region 114 of the image side surface 11b of the first reflecting lens 11 and the second sub-region 112 of the image side surface 11b of the first reflecting lens 11. The thickness of S7 refers to the distance between the second sub-region 112 of the image side surface 11b of the first reflecting lens 11 and the fourth sub-region 114 of the image side surface 11b of the first reflecting lens 11. The thickness of S8 refers to the distance between the fourth sub-region 114 of the image side surface 11b of the first reflecting lens 11 and the sixth sub-region 122 of the object side surface 12a of the second reflecting lens 12. The thickness of S9 refers to the distance between the sixth sub-region 122 of the object side surface 12a of the second reflecting lens 12 and the eighth sub-region 124 of the image side surface 12b of the second reflecting lens 12. The thickness of S10 refers to the distance between the eighth sub-region 124 of the image-side surface 12b of the second reflecting lens 12 and the object-side surface of the first lens 21. The thickness of S11 refers to the distance between the object-side surface and the image-side surface of the first lens 21. The thickness of S12 refers to the distance between the image-side surface of the first lens 21 and the object-side surface of the second lens 22. The thickness of S13 refers to the distance between the object-side surface and the image-side surface of the second lens 22. The thickness of S14 refers to the distance between the image-side surface of the second lens 22 and the first surface 31a of the first sub-folding element 3a. The thickness of S15 refers to the distance between the first surface 31a and the second surface 32a of the first sub-folding element 3a. The thickness of S16 refers to the distance between the second surface 32a and the reflecting surface 33a of the first sub-folding element 3a. The thickness of S17 refers to the distance between the reflecting surface 33a and the first surface 31a of the first sub-folding element 3a. The thickness of S18 refers to the distance between the first surface 31a and the second surface 32a of the first sub-folding element 3a.The thickness of S19 refers to the distance between the second surface 32a of the first sub-folding element 3a and the first surface 31b of the second sub-folding element 3b. The thickness of S20 refers to the distance between the first surface 31b of the second sub-folding element 3b and the reflecting surface 33b of the second sub-folding element 3b. The thickness of S21 refers to the distance between the reflecting surface 33b of the second sub-folding element 3b and the first surface 31b of the second sub-folding element 3b. The thickness of S22 refers to the distance between the first surface 31b of the second sub-folding element 3b and the second surface 32b of the second sub-folding element 3b. The thickness of S23 refers to the distance between the second surface 32b of the second sub-folding element 3b and the object-side surface of the filter 30. The thickness of S24 refers to the distance between the object-side surface of the filter 30 and the image-side surface of the filter 30. The thickness of S25 refers to the distance between the image-side surface of the filter 30 and the object-side surface of the image sensor 20. The thickness of S26 refers to the distance between the object-side surface of the image sensor 20 and the imaging surface.

[0453] Among them, the optical lens 10 satisfies: FOV = 9.5°. It can be understood that by limiting the full field of view (FOV) of the optical lens 10 to 9.5°, distortion and falsification at the image edges are reduced or avoided. Moreover, the optical lens 10 has a smaller full field of view (FOV), a smaller field of view, and a larger optical magnification, which can better meet the ultra-telephoto design requirements of the optical lens 10.

[0454] Among them, the folding element 3 satisfies: Vd = 42.7. It can be understood that the folding element 3 has a large Abbe number, which can reduce the chromatic aberration and dispersion problems in the optical lens 10, and can better correct chromatic aberration and dispersion, resulting in higher resolution and clearer image quality of the optical lens 10.

[0455] Furthermore, the aspherical coefficients of each element of the camera module 300 in the seventh embodiment of this application are shown in Table 20 below.

[0456] Table 20 Aspheric coefficients of various components of the camera module 300 in the seventh embodiment.

[0457] It is understandable that, among the 14 aspherical surfaces of the camera module 300 shown in Tables 19 and 20, all even-order and odd-order aspherical surface shapes z can be defined using, but are not limited to, the following aspherical formulas:

[0458] Where z(x,y) is the optical surface sagitta; k is the conic coefficient; c is the radius of curvature; r is the radius height along the optical axis; r 2 =x 2 +y 2 ;α i These are the polynomial coefficients; ri These are standardized radial coordinates. By substituting the design parameters of the first reflecting lens 11, the second reflecting lens 12, the first lens 21, and the second lens 22 of the optical lens 10 into the above aspherical formula, the object-side and image-side surface shapes of the first reflecting lens 11, the second reflecting lens 12, the first lens 21, and the second lens 22 of the camera module 300 in the seventh embodiment of this application can be obtained.

[0459] Based on the data in Tables 19 and 20, some parameters of the camera module 300 in the seventh embodiment of this application can be obtained as shown in Table 21 below.

[0460] Table 21 Partial parameters of the camera module 300 in the seventh embodiment.

[0461] It is understood that the setting range of the relevant optical parameters in this embodiment can be referred to the setting range of the relevant optical parameters in the first embodiment.

[0462] The back focal length RBL of the mirror group 1 (which is the sum of the absolute values ​​of the thicknesses of S10 and S25 in Table 19) and the focal length EFL of the optical lens 10 satisfy the following ratio: RBL / EFL = 0.59. It can be understood that by limiting the ratio of the back focal length RBL of the mirror group 1 to the focal length EFL of the optical lens 10 to 0.59, it ensures that the interior of the mirror group 1 has space where light can undergo at least two reflections, and that the optical lens 10 has sufficient space to arrange the lens group 2, resulting in a high magnification of the optical lens 10 and good super-telephoto shooting performance.

[0463] Specifically, the distance LEL between the object-side surface 1c of the mirror assembly 1 and the image-side surface of the last lens in the lens assembly 2 arranged along the first direction, and the height LH of the camera module 300 satisfy: LEL / LH = 0.50. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c of the mirror assembly 1 and the image-side surface of the last lens in the lens assembly 2 arranged along the first direction to the height LH of the camera module 300 to 0.50, the height of the camera module 300 can be reduced, which is beneficial for reducing the shoulder height of the camera module 300, thereby facilitating the miniaturization of the camera module 300.

[0464] The distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction, and the total system optical length TTL of the camera module 300 satisfy: LEL / TTL = 0.18. It can be understood that by limiting the ratio of the distance LEL between the object-side surface 1c of the mirror group 1 and the image-side surface of the last lens of the lens group 2 arranged along the first direction to the total system optical length TTL of the camera module 300 to 0.18, the height of the optical lens 10 and the camera module 300 is reduced, which is beneficial for reducing the shoulder height of the optical lens 10 and the camera module 300, thereby facilitating the miniaturization of the optical lens 10 and the camera module 300.

[0465] The thickness CTR of the mirror group 1 and the maximum light transmission diameter LD of the area through which light passes through the object side 1c of the mirror group 1 satisfy the following condition: CTR / LD = 0.32. It can be understood that by limiting the ratio of the thickness CTR of the mirror group 1 to the maximum light transmission diameter LD of the area through which light passes through the object side 1c of the mirror group 1 to 0.32, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0466] Specifically, the maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 and the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 satisfy the following ratio: LD / LRD = 2.88. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object-side surface 1c of the mirror group 1 to the maximum light-transmitting diameter LRD of the area where light exits the image-side surface 1d of the mirror group 1 to 2.88, the light reflected by the mirror group 1 is reduced, thus decreasing the height of the optical lens 10. This helps to reduce the shoulder height of the optical lens 10, thereby facilitating the miniaturization of the optical lens 10.

[0467] The height HP of the folding element 3, the image height IH of the optical lens 10, and the angle PA of the minimum acute angle inside the folding element 3 satisfy: HP - 1.25 × IH × tan(PA) = 0.94. It can be understood that by limiting HP - 1.25 × IH × tan(PA) to 0.94, it is beneficial to fold the optical path, thereby reducing the size of the optical lens 10 and facilitating its miniaturization.

[0468] In other embodiments, the form of the minimum acute angle inside the folding element 3 is not limited to the sharp angle shown in FIG26. For example, the minimum acute angle inside the folding element 3 can be rounded or ground into a flat surface according to actual needs. This application does not limit the specific implementation.

[0469] Specifically, the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 and the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 satisfy the condition: LD / RD = 3.00. It can be understood that by limiting the ratio of the maximum light-transmitting diameter LD of the area where light passes through the object side 1c of the mirror group 1 to the maximum light-transmitting diameter RD of the area where light passes through the first lens 21 to 3.00, the light reflected by the mirror group 1 is reduced, while simultaneously intercepting the light and correcting off-axis aberrations.

[0470] Specifically, the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 satisfies the ratio of DOR / IH of the optical lens 10 to 2.13. It can be understood that by limiting the ratio of the maximum reflective diameter DOR of the region closest to the object side where reflection occurs on the mirror group 1 to the image height IH of the optical lens 10 to 2.13, the obstruction of on-axis light rays is reduced, light loss is decreased, thereby improving the imaging quality of the optical lens 10.

[0471] Figure 27 is a simulation effect diagram of the telephoto end of the camera module 300 in the seventh embodiment.

[0472] As shown in Figure 27, when the camera module 300 is at the telephoto end, the normalized coordinates of the camera module 300 are all small, the axial chromatic aberration (spherical aberration, chromatic aberration, etc.) correction of the camera module 300 is better, and the imaging quality of the camera module 300 is higher.

[0473] Figure 28 is a simulation effect diagram of the telephoto end of the camera module 300 in the seventh embodiment.

[0474] As shown in Figure 28, when the camera module 300 is at the telephoto end, the field curvature in both directions is small, the camera module 300 has a good depth of focus, and the imaging quality of the camera module 300 is high.

[0475] Figure 29 is a simulation effect diagram of the telephoto end of the camera module 300 in the seventh embodiment.

[0476] As shown in Figure 29, when the camera module 300 is at the telephoto end, the optical distortion ratio of the camera module 300 at different image heights is less than 0.5%, which can ensure that there is no obvious distortion in the image, the degree of optical distortion of the image is small, and the imaging quality of the camera module 300 is high.

[0477] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other, and any combination of features in different embodiments is also within the protection scope of this application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0478] It should be noted that all the above-described figures are exemplary illustrations of this application and do not represent the actual size of the product. Furthermore, the dimensional proportions between the components in the figures are not intended to limit the actual product of this application. The above are merely some embodiments and implementation methods of this application, and the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical lens (10), characterized in that, The optical lens (10) comprises, arranged in order from the object side to the image side, a mirror group (1), a lens group (2) and a folding element (3); The mirror group (1) comprises an incident surface (1a) and an exit surface (1b), the exit surface (1b) of the mirror group (1) is arranged to face the lens group (2), light rays enter the inside of the mirror group (1) from the incident surface (1a) of the mirror group (1), after at least two reflections in the inside of the mirror group (1), the light rays are emitted from the exit surface (1b) of the mirror group (1) and enter the lens group (2); The folding element (3) comprises an incident surface (33) and an exit surface (34), the incident surface (33) of the folding element (3) is arranged to face the lens group (2), after passing through the lens group (2), light rays enter the inside of the folding element (3) from the incident surface (33) of the folding element (3), after at least one reflection in the inside of the folding element (3), the light rays are emitted from the exit surface (34) of the folding element (3).

2. The optical lens (10) according to claim 1, characterized in that, The optical lens (10) satisfies: 0.2 < RBL / EFL < 1.1, wherein RBL is the back focal length of the mirror group (1), and EFL is the focal length of the optical lens (10).

3. The optical lens (10) according to claim 1 or 2, characterized in that, The optical lens (10) satisfies: FOV < 50°, wherein FOV is the full field of view of the optical lens (10).

4. The optical lens (10) according to any one of claims 1 to 3, characterized in that, The optical lens (10) satisfies: LD / LRD > 1.5, wherein LD is the maximum light passing diameter of the area through which the light passes the object side surface (1c) of the mirror group (1), and LRD is the maximum light passing diameter of the area through which the light is emitted from the image side surface (1d) of the mirror group (1).

5. The optical lens (10) according to any one of claims 1 to 4, characterized in that, The lens group (2) comprises a first lens (21), and the first lens (21) is located on the image side of the mirror group (1). The optical lens (10) satisfies: LD / RD > 1.1, wherein RD is the maximum light passing diameter of the area through which the light passes the first lens (21). The optical lens (10) satisfies: CTR / LD < 0.7, wherein CTR is the thickness of the mirror group (1).

6. The optical lens (10) according to any one of claims 1 to 5, characterized in that, The optical lens (10) satisfies: 0.6 < DOR / IH < 5, wherein DOR is the maximum reflected light diameter of the area closest to the object side where reflection occurs in the mirror group (1), and IH is the image height of the optical lens (10).

7. The optical lens (10) according to any one of claims 1 to 6, characterized in that, The folding element (3) satisfies: -1 < HP-1.25 x IH x tan(PA) < 5, wherein HP is the height of the folding element (3) in the height direction of the optical lens (10), and PA is the angle of the smallest acute angle inside the folding element (3).

8. The optical lens (10) according to any one of claims 1 to 7, characterized in that, The folding element (3) satisfies: Vd > 15, wherein Vd is the Abbe number of the folding element (3).

9. The optical lens (10) according to any one of claims 1 to 8, characterized in that, The incident surface (1a) of the mirror group (1) is located on the object side surface (1c) of the mirror group (1), and the exit surface (1b) of the mirror group (1) is located on the image side surface (1d) of the mirror group (1).

10. The optical lens (10) according to any one of claims 1 to 9, characterized in that, ​ The first reflection of the light ray in the mirror group (1) is on the image side of the second reflection of the light ray in the mirror group (1).

11. The optical lens (10) according to claim 10, characterized in that, The mirror group (1) comprises a first reflection surface (1e), which is the area closest to the image side on the mirror group (1) where reflection occurs. The first reflection surface (1e) of the mirror group (1) is curved towards the object side.

12. The optical lens (10) according to claim 10, characterized in that, The mirror group (1) comprises a second reflection surface (1f), which is the area closest to the object side on the mirror group (1) where reflection occurs. The second reflection surface (1f) of the mirror group (1) is curved towards the object side.

13. The optical lens (10) according to any one of claims 1 to 12, characterized in that, The folding element (3) comprises a top surface (31) and a bottom surface (32) arranged back-to-back, the top surface (31) of the folding element (3) faces the exit surface (1b) of the mirror group (1), and the entrance surface (33) and the exit surface (34) of the folding element (3) are both located on the top surface (31) of the folding element (3). The folding element (3) further comprises a first reflection surface (35) and a second reflection surface (36), the first reflection surface (35) and the second reflection surface (36) of the folding element (3) connect the top surface (31) and the bottom surface (32) of the folding element (3). After the light ray enters the folding element (3), reflection occurs on the first reflection surface (35), the top surface (31), and the second reflection surface (36) of the folding element (3).

14. The optical lens (10) according to any one of claims 1 to 12, characterized in that, The folding element (3) comprises a top surface (31) and a bottom surface (32) arranged back-to-back, the entrance surface (33) and the exit surface (34) of the folding element (3) are both located on the top surface (31) of the folding element (3). The folding element (3) further comprises a first reflection surface (35) and a second reflection surface (36), the first reflection surface (35) and the second reflection surface (36) connect the top surface (31) and the bottom surface (32) of the folding element (3). After the light ray enters the folding element (3), reflection occurs on the first reflection surface (35), the top surface (31), the bottom surface (32), and the second reflection surface (36) of the folding element (3).

15. The optical lens (10) according to any one of claims 1 to 12, characterized in that, The folding element (3) comprises a first surface (37), a second surface (38) and a reflecting surface (39), the first surface (37) of the folding element (3) is connected to the second surface (38) of the folding element (3), and the reflecting surface (39) of the folding element (3) is connected to the first surface (37) of the folding element (3) and the second surface (38) of the folding element (3), the first surface (37) of the folding element (3) faces the lens group (2), the incident surface (33) of the folding element (3) is located on the first surface (37) of the folding element (3), and the emergent surface (34) of the folding element (3) is located on the second surface (38) of the folding element (3); After the light enters the folding element (3), the light is reflected on the second surface (38) of the folding element (3) and the reflecting surface (39) of the folding element (3).

16. The optical lens (10) according to any one of claims 1 to 12, characterized in that, The folding element (3) comprises a first sub-folding element (3a) and a second sub-folding element (3b), and the first sub-folding element (3a) is fixedly connected to the second sub-folding element (3b). The first sub-folding element (3a) comprises a first surface (31a), a second surface (32a) and a reflecting surface (33a), the first surface (31a) of the first sub-folding element (3a) is connected to the second surface (32a) of the first sub-folding element (3a) and the reflecting surface (33a) of the first sub-folding element (3a), the first surface (31a) of the first sub-folding element (3a) faces the lens group (2), and the incident surface (33) of the folding element (3) is located on the first surface (31a) of the first sub-folding element (3a). The second sub-folding element (3b) comprises a first surface (31b), a second surface (32b) and a reflecting surface (33b), the second surface (32b) of the second sub-folding element (3b) is connected to the first surface (31b) of the second sub-folding element (3b) and the reflecting surface (33b) of the second sub-folding element (3b), the first surface (31b) of the second sub-folding element (3b) faces the second surface (32a) of the first sub-folding element (3a), and the emergent surface (34) of the folding element (3) is located on the second surface (32b) of the second sub-folding element (3b). After the light enters the first sub-folding element (3a), the light is reflected on the second surface (32a) of the first sub-folding element (3a), the reflecting surface (33a) of the first sub-folding element (3a) and the first surface (31a) of the first sub-folding element (3a), and then the light is emitted from the second surface (32a) of the first sub-folding element (3a) and enters the second sub-folding element (3b) through the first surface (31b) of the second sub-folding element (3b), and the light is reflected on the reflecting surface (33b) of the second sub-folding element (3b) and the first surface (31b) of the second sub-folding element (3b).

17. The optical lens (10) according to any one of claims 1 to 16, characterized in that, The lens group (2) comprises a light transfer element (24) and one or more lenses, the one or more lenses are located on the image side of the light transfer element (24), and the light transfer element (24) is used to change the optical axis of the first direction to the second direction, and the first direction is different from the second direction; The light transfer element (24) comprises an incident surface (241), an exit surface (242) and a reflection surface (243), the incident surface (241) of the light transfer element (24) is connected to the exit surface (242) of the light transfer element (24), the reflection surface (243) of the light transfer element (24) is connected to the incident surface (241) of the light transfer element (24) and the exit surface (242) of the light transfer element (24), the incident surface (241) of the light transfer element (24) is arranged to face the exit surface (1b) of the mirror group (1), and the exit surface (242) of the light transfer element (24) is arranged to face the one or more lenses; The light reflected by the mirror group (1) enters the inside of the light transfer element (24) from the incident surface (241) of the light transfer element (24), is reflected on the reflection surface (243) of the light transfer element (24), is emitted from the exit surface (242) of the light transfer element (24) and enters the one or more lenses.

18. An optical lens (10) characterized in that, The mirror group (1) and the lens group (2) are arranged in sequence from the object side to the image side, and the lens group (2) comprises a first lens (21) and a light transfer element (24), and the first lens (21) is located on the image side of the light transfer element (24); The mirror group (1) comprises an incident surface (1a) and an exit surface (1b), the light transfer element (24) comprises an incident surface (241), an exit surface (242) and a reflection surface (243), the incident surface (241) of the light transfer element (24) is connected to the exit surface (242) of the light transfer element (24), the reflection surface (243) of the light transfer element (24) is connected to the incident surface (241) of the light transfer element (24) and the exit surface (242) of the light transfer element (24), and the exit surface (1b) of the mirror group (1) is arranged to face the incident surface (241) of the light transfer element (24); The light enters the inside of the mirror group (1) from the incident surface (1a) of the mirror group (1), is reflected at least twice in the inside of the mirror group (1), is emitted from the exit surface (1b) of the mirror group (1) and enters the light transfer element (24), is reflected on the reflection surface (243) of the light transfer element (24), is changed from the first direction to the second direction, is emitted from the exit surface (242) of the light transfer element (24) and enters the first lens (21), and the first direction intersects the second direction.

19. The optical lens (10) according to claim 18, characterized in that, The optical lens (10) satisfies: 0.2 < RBL / EFL < 1.1, where RBL is the back focal length of the mirror group (1), and EFL is the focal length of the optical lens (10).

20. The optical lens (10) according to claim 18 or 19, characterized in that, The optical lens (10) satisfies: FOV ≤ 50°, where FOV is the full field of view angle of the optical lens (10).

21. The optical lens (10) according to any one of claims 18 to 20, characterized in that, The optical lens (10) satisfies: LD / RD > 1.1, where LD is the maximum clear aperture diameter of the area where light passes through the object side surface (1c) of the mirror group (1), and RD is the maximum clear aperture diameter of the area where light passes through the first lens (21).

22. The optical lens (10) according to any one of claims 18 to 21, wherein, The optical lens (10) satisfies: LD / LRD > 1.5, where LRD is the maximum clear aperture diameter of the area where light exits the image side surface (1d) of the mirror group (1).

23. The optical lens (10) according to any one of claims 18 to 22, characterized in that, The optical lens (10) satisfies: CTR / LD < 0.7, where CTR is the thickness of the mirror group (1).

24. The optical lens (10) according to any one of claims 18 to 23, characterized in that, The optical lens (10) satisfies: 0.6 < DOR / IH < 5, where DOR is the maximum reflective diameter of the area closest to the object side where light is reflected on the mirror group (1), and IH is the image height of the optical lens (10).

25. The optical lens (10) according to any one of claims 18 to 24, characterized in that, The incident surface (1a) of the mirror group (1) is located on the object side surface (1c) of the mirror group (1), and the exit surface (1b) of the mirror group (1) is located on the image side surface (1d) of the mirror group (1); After the light enters the mirror group (1), the first reflection of the light within the mirror group (1) is on the image side of the second reflection of the light within the mirror group (1).

26. A camera module (300) comprising: It includes an image sensor (20) and the optical lens (10) according to any one of claims 1 to 25, and the image sensor (20) is located on the image side of the optical lens (10).

27. The camera module (300) according to claim 26, characterized in that, The camera module (300) satisfies: LEL / TTL < 0.6, where TTL is the total optical length of the camera module (300).

28. The optical lens (10) according to claim 26 or 27, characterized in that, The camera module (300) satisfies: 0.2 < LEL / LH < 0.9, where LEL is the distance between the object side surface (1c) of the mirror group (1) and the image side surface of the last lens when at least part of the lens group (2) is arranged in the first direction, or LEL is the distance between the object side surface (1c) and the image side surface (1d) of the mirror group (1) when the lens group (2) is arranged entirely in the second direction. LH is the height of the camera module (300), the first direction is the optical axis direction of the mirror group (1), and the second direction is different from the first direction.

29. An electronic device (1000), characterized by: It includes an image processor (400) and the camera module (300) according to any one of claims 26 to 二十八, the image processor (400) is communicatively connected to the camera module (300), and the image processor (获取图像数据) is used to obtain image data from the camera module (300) and process the image data.

Images