Camera module and electronic device

Abstract

The present application relates to the technical field of terminals. Provided are a camera module and an electronic device, which can effectively reduce the thickness of the camera module in the electronic device. The camera module comprises: a lens assembly and a photosensitive chip. The lens assembly comprises a lens group and a first prism. The first prism is located on an image side of the lens group, and the photosensitive chip is located on an image side of the first prism. The first prism comprises a first optical surface, a second optical surface and a third optical surface that are non-parallel to each other, wherein the first optical surface is arranged opposite a light-emergent surface of the lens group to serve as a light-incident surface of the first prism, light entering the first prism from the first optical surface is reflected at least twice in the first prism, and the third optical surface serves as a light-emergent surface of the first prism. The photosensitive chip is arranged in parallel to the third optical surface, and the included angle between the photosensitive chip and the optical axis of the lens group is an acute angle. In the camera module, the following relational expression is satisfied: (I), where FBL represents the length of an optical path from the light-emergent surface of the lens group to the photosensitive chip, and FL represents the focal length of the lens assembly.

Description

Camera module and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202410732632.0, filed on June 6, 2024, and entitled "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 technical field of terminal, more specifically, relates to a camera module and electronic device. BACKGROUND

[0003] Periscopic lens is a kind of long-focus lens which can complete optical zoom inside the electronic device. If the camera module including the periscopic lens is arranged in the electronic device, the electronic device can have powerful optical zoom capability and can capture scenes at a farther (or closer) distance. However, based on the current structure design of the camera module, the thickness of the camera module close to the image side has become the main factor affecting the miniaturization of the electronic device. How to effectively reduce the thickness of the camera module in the electronic device has become a problem to be solved. SUMMARY

[0004] The present application provides a camera module and electronic device, which can effectively reduce the thickness of the camera module close to the image side, and is beneficial to the miniaturization development of the electronic device.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a camera module, which comprises: a lens assembly and a photosensitive chip, the lens assembly comprises a lens group and a first prism, the first prism is located on the image side of the lens group, and the photosensitive chip is located on the image side of the first prism.

[0007] The first prism comprises a first optical surface, a second optical surface and a third optical surface which are not parallel to each other, the first optical surface is arranged opposite to the light exit surface of the lens group to serve as the light entrance surface of the first prism, the light rays entering the first prism from the first optical surface produce at least two reflections in the first prism, and the third optical surface serves as the light exit surface of the first prism.

[0008] The photosensitive chip is arranged in parallel with the third optical surface, and the included angle between the photosensitive chip and the optical axis of the lens group is an acute angle.

[0009] The camera module satisfies the following relationship:

[0010] In the above relationship, FBL represents the optical path length from the light exit surface of the lens group to the photosensitive chip; and FL represents the focal length of the lens assembly.

[0011] In the camera module provided in the present application, the angle between the optical axis of the lens group and the photosensitive chip is set to an acute angle, so that the photosensitive chip can be obliquely arranged in the electronic device, and then the light entering the first prism is projected to the photosensitive chip after being reflected at least twice by the first prism. Compared with the case where the height of the first prism (for example, a rear 45° prism) in the existing camera module increases with the increase of the size of the photosensitive chip, such a design effectively eliminates the restriction of the size of the photosensitive chip on the thickness of the periscope lens (including the lens group and the first prism), reduces the thickness of the camera module close to the image side, and further reduces the thickness of the electronic device, which is conducive to the miniaturization of the electronic device.

[0012] In addition, by optimizing the ratio between FBL and FL, the camera module can have a longer back focal length, which facilitates the arrangement of a first prism with a lower thickness between the lens group and the photosensitive chip, so as to fold the optical path more times, achieve a longer optical path, facilitate aberration correction, and obtain high-quality images. In this way, the thickness of the camera module can be further reduced without affecting the optical imaging performance of the camera module.

[0013] In a possible implementation manner of the first aspect, the first optical surface, the second optical surface, and the third optical surface are connected to each other in pairs;

[0014] The angle between the first optical surface and the second optical surface is a first angle, the angle between the first optical surface and the third optical surface is a second angle, the second optical surface serves as a first reflection surface, the first optical surface serves as a second reflection surface, the second angle is greater than the first angle, and the light entering the first prism from the first optical surface is reflected by the first reflection surface and the second reflection surface in sequence and then exits the first prism from the third optical surface; or,

[0015] The angle between the second optical surface and the third optical surface is a first angle, the angle between the first optical surface and the third optical surface is a second angle, the third optical surface serves as a first reflection surface, the second optical surface serves as a second reflection surface, the second angle is greater than the first angle, and the light entering the first prism from the first optical surface is reflected by the first reflection surface and the second reflection surface in sequence and then exits the first prism from the third optical surface.

[0016] In a possible implementation manner of the first aspect, the first prism further includes a fourth optical surface opposite to the first optical surface, the second optical surface opposite to the third optical surface, and the first optical surface, the third optical surface, the fourth optical surface and the second optical surface sequentially connected to form the first prism, an included angle between the first optical surface and the second optical surface is a first angle, and an included angle between the third optical surface and the fourth optical surface is a second angle.

[0017] The second angle is greater than the first angle, the second optical surface serves as a first reflection surface, the first optical surface serves as a second reflection surface, and the fourth optical surface serves as a third reflection surface, and a light ray entering the first prism from the first optical surface is reflected by the first reflection surface, the second reflection surface and the third reflection surface in sequence and then emitted from the third optical surface of the first prism.

[0018] Based on the above possible implementation manner, the first prism can be an optical lens with four optical surfaces, compared with an optical lens with three optical surfaces, the above first prism can be arranged with a lower thickness in the camera module and is more stable and reliable in structure.

[0019] Optionally, the fourth optical surface is arranged in parallel with the first optical surface.

[0020] Based on the above possible implementation manner, deformation of the first prism caused by factors such as mechanical vibration or temperature change can be effectively reduced, and the stability of the optical performance of the first prism under complex environmental conditions is ensured. In addition, the parallel arrangement of the two opposite optical surfaces in the first prism also helps to reduce distortion and distortion during imaging, improves the clarity and accuracy of imaging, and facilitates the manufacturing and installation of the first prism.

[0021] In a possible implementation manner of the first aspect, the second angle is twice the first angle, and the first angle is less than 45°.

[0022] In a possible implementation manner, the second angle can also be 1.98 times the first angle, and the first angle is less than 45°.

[0023] Based on the above optional implementation manner, a light ray entering the first prism perpendicularly to the light entrance surface can be emitted perpendicularly to the light exit surface of the first prism, ensuring the imaging quality.

[0024] In a possible implementation manner of the first aspect, the camera module satisfies the following relationship: In the relationship, Np represents the refractive index of the first prism, and a represents the first angle.

[0025] Based on the above possible implementation, the refractive index of the first prism determines the degree of deflection of the light rays when propagating inside the first prism, and the first prism satisfying the above relationship can control the deflection angle of the light rays in the first prism, so that the light rays entering the first prism can be reflected as much as possible in the first prism, thereby reducing the loss of light energy.

[0026] In a possible implementation of the first aspect, the first angle is in a range of 28° to 32°.

[0027] For example, the first angle can be 28°, 29°, 30°, 32°, or the like.

[0028] In a possible implementation of the first aspect, the lens assembly includes a second prism, the second prism has an included angle between an entrance surface and an exit surface of the second prism, the lens group is located on an image side of the second prism, and an entrance surface of the lens group is arranged opposite to the exit surface of the second prism.

[0029] Based on the above possible implementation, the second prism can be used to change the direction of the light rays, and the lens group of the camera module is arranged along the length direction of the electronic device instead of the thickness direction of the electronic device, so that the lens group is less limited in size, thereby achieving a longer focal length without increasing the thickness of the electronic device.

[0030] In a possible implementation, the second prism can be a 45° prism.

[0031] In a possible implementation of the first aspect, the lens assembly includes an entrance lens, and the entrance lens is located on an object side of the second prism.

[0032] In a possible implementation of the first aspect, the lens group includes a first lens group, and the first lens group has a positive focal length.

[0033] It should be understood that the number of the first lens groups in the lens group can include one or more, and the first lens group with a positive focal length can be used for imaging.

[0034] Optionally, the lens group includes at least one lens group, and the at least one lens group includes the first lens group.

[0035] In a possible implementation of the first aspect, the first prism has a refractive index greater than 1.45, and / or the first prism has an Abbe number greater than 18.

[0036] In a possible implementation of the first aspect, the lens assembly satisfies a relationship: IH>3mm, where IH represents half of the diagonal length of an effective imaging area of the lens assembly.

[0037] In a possible implementation manner of the first aspect, the lens assembly satisfies a relationship: Fno < 5.0, where Fno represents an F-number of the lens assembly.

[0038] In a possible implementation manner of the first aspect, the lens assembly satisfies a relationship: FOV < 60°, where FOV represents a field of view of the lens assembly.

[0039] In a possible implementation manner of the first aspect, the lens assembly satisfies a relationship: S > 0.9 * FL, where S represents a light path length from an entrance surface of the lens assembly to the photosensitive chip; and FL represents a focal length of the lens assembly.

[0040] Based on the possible implementation manners described above, the light path length of the light rays in the camera module can be effectively prolonged, the aberration correction can be facilitated, a high-quality image can be obtained, and the imaging effect can be improved.

[0041] In a possible implementation manner of the first aspect, the lens assembly satisfies a relationship: SP > 2 * IH, where SP represents a light path length from the entrance surface of the first prism to the exit surface of the first prism, and IH represents half of a diagonal length of an effective imaging area of the lens assembly.

[0042] Based on the possible implementation manners described above, the light rays emitted from the first prism can be projected on the photosensitive chip as much as possible, and the loss of light energy can be effectively reduced.

[0043] In a possible implementation manner of the first aspect, the first prism and the lens assembly satisfy a relationship: Hp < 1.8 * IH, where Hp represents a height of the first prism, and IH represents half of a diagonal length of an effective imaging area of the lens assembly.

[0044] It should be understood that the height of the first prism is a dimension of the first prism in a thickness direction of the camera module.

[0045] In a possible implementation manner of the first aspect, the first prism includes any one of a three-prism, a four-prism, a five-prism, and a six-prism.

[0046] In a possible implementation manner of the first aspect, the camera module further includes a filter, which is arranged between the first prism and the photosensitive chip.

[0047] In a second aspect, the present application provides an electronic device, which includes a housing and the camera module of the first aspect and any one of the implementation manners of the first aspect.

[0048] Optionally, the electronic device includes, but is not limited to, a camera, a mobile phone, a personal digital assistant, a tablet computer, a vehicle-mounted computer, a laptop computer, a smart screen, an ultra-mobile personal computer, a handheld device, a smart watch, a driving record device, a monitoring device, and other devices with camera and photographing functions.

[0049] The technical effects of the second aspect provided in the present application can be referred to the technical effects of the first aspect and each optional mode of the first aspect, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0050] FIG. 1 is a structural schematic diagram of an existing camera module provided by an embodiment of the present application.

[0051] FIG. 2 is a structural schematic diagram of an existing camera module installed in an electronic device provided by an embodiment of the present application.

[0052] FIG. 3 is a structural schematic diagram of a camera module provided by an embodiment of the present application.

[0053] FIG. 4 is a cross-sectional structural schematic diagram when the first prism is a three-prism provided by an embodiment of the present application.

[0054] FIG. 5 is a cross-sectional structural schematic diagram when the first prism is a four-prism provided by another embodiment of the present application.

[0055] FIG. 6 is a vertical axis chromatic aberration diagram of a lens assembly provided by an embodiment of the present application.

[0056] FIG. 7 is a field curvature diagram of astigmatism of a lens assembly provided by an embodiment of the present application.

[0057] FIG. 8 is an optical distortion curve diagram of a lens assembly provided by an embodiment of the present application.

[0058] FIG. 9 is a structural schematic diagram of another camera module provided by an embodiment of the present application.

[0059] FIG. 10 is a cross-sectional structural schematic diagram when the first prism is a four-prism provided by an embodiment of the present application.

[0060] FIG. 11 is a cross-sectional structural schematic diagram when the first prism is a five-prism provided by an embodiment of the present application.

[0061] FIG. 12 is a cross-sectional structural schematic diagram when the first prism is a five-prism provided by another embodiment of the present application.

[0062] FIG. 13 is a cross-sectional structural schematic diagram when the first prism is a six-prism provided by an embodiment of the present application.

[0063] FIG. 14 is a vertical axis chromatic aberration diagram of another lens assembly provided by an embodiment of the present application.

[0064] FIG. 15 is a field curvature graph of another lens assembly provided by embodiments of the present application.

[0065] FIG. 16 is an optical distortion curve graph of another lens assembly provided by embodiments of the present application.

[0066] FIG. 17 is a structure schematic diagram of still another camera module provided by embodiments of the present application.

[0067] FIG. 18 is a cross-sectional structure schematic diagram when a first prism is a three-prism provided by embodiments of the present application.

[0068] FIG. 19 is a cross-sectional structure schematic diagram when a first prism is a four-prism provided by embodiments of the present application.

[0069] FIG. 20 is a cross-sectional structure schematic diagram when a first prism is a four-prism provided by embodiments of the present application.

[0070] FIG. 21 is a cross-sectional structure schematic diagram when a first prism is a five-prism provided by embodiments of the present application.

[0071] FIG. 22 is a vertical axis chromatic aberration graph of still another lens assembly provided by embodiments of the present application.

[0072] FIG. 23 is a field curvature graph of still another lens assembly provided by embodiments of the present application.

[0073] FIG. 24 is an optical distortion curve graph of still another lens assembly provided by embodiments of the present application.

[0074] FIG. 25 is a structure schematic diagram of still another camera module provided by embodiments of the present application.

[0075] FIG. 26 is a vertical axis chromatic aberration graph of still another lens assembly provided by embodiments of the present application.

[0076] FIG. 27 is a field curvature graph of still another lens assembly provided by embodiments of the present application.

[0077] FIG. 28 is an optical distortion curve graph of still another lens assembly provided by embodiments of the present application.

[0078] FIG. 29 is a structure schematic diagram of a lens group in a macro imaging state provided by embodiments of the present application.

[0079] FIG. 30 is a vertical axis chromatic aberration graph of still another lens assembly provided by embodiments of the present application.

[0080] FIG. 31 is a field curvature graph of still another lens assembly provided by embodiments of the present application.

[0081] FIG. 32 is an optical distortion curve graph of still another lens assembly provided by embodiments of the present application.

[0082] Reference signs: 10, camera module; 11, lens; 12, front 45° prism; 13, zoom lens group; 14, rear 45° prism; 15, photosensitive chip; 20, rear cover; 30, display screen; 100, lens assembly; 101, lens group; 1011, first lens; 1012, second lens; 1013, third lens; 1014, fourth lens; 1015, fifth lens; 1016, sixth lens; 102, first prism; 1021, first optical surface; 1022, second optical surface; 1023, third optical surface; 1024, fourth optical surface; 103, second prism; 104, incident lens; 200, photosensitive chip. DETAILED DESCRIPTION

[0083] The embodiments of the present application are described below in detail with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be construed as limiting the present application.

[0084] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0085] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0086] In the description of the present application, it should be understood that the terms "up", "down", "side", "front", "back" and the like indicate the orientation or positional relationship based on the installation, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.

[0087] It should be noted that, in the description of the present application, the term "and / or" is merely used to describe an associated relationship between associated objects, and can represent three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone.

[0088] It should be further noted that the same reference signs are used to represent the same components or the same parts in the embodiments of the present application. For the same parts in the embodiments of the present application, only one part or component may, for example, be labeled with a reference sign in the drawings, and it should be understood that the reference sign is also applicable to other identical parts or components.

[0089] The periscopic lens is a lens capable of completing optical zoom inside an electronic device. The optical zoom refers to adjusting the focal length of the periscopic lens by moving the distance between optical lenses, thereby realizing the effect of magnifying or reducing the scene. If a camera module including the periscopic lens is arranged in the electronic device, the electronic device can have powerful optical zoom capability to capture images of scenes at a farther (or closer) distance.

[0090] As shown in FIG. 1, FIG. 1 is a structural schematic diagram of an existing camera module 10 provided by an embodiment of the present application. Referring to FIG. 1, light reflected by a scene passes through a lens 11 and a front 45° prism 12 and is reflected into a zoom lens group 13. The zoom lens group 13 performs optical zoom and then emits the light out of the zoom lens group 13 into a rear 45° prism 14. The light incident on the rear 45° prism 14 is reflected once in the rear 45° prism 14 and then enters a photosensitive chip 15.

[0091] Taking the electronic device as a portable electronic device (for example, a mobile phone, a tablet computer, etc.), the camera module 10 is installed inside the electronic device. A back plate or a display screen of the electronic device is provided with a light inlet hole. Light from the outside enters the camera module 10 through the light inlet hole, is optically processed by the zoom lens group 13, and is imaged on the photosensitive chip 15. The electronic device further includes an analog-to-digital converter and an image processor. The analog-to-digital converter is used to convert an analog signal generated by the photosensitive chip 15 into a digital signal. The digital signal can be directly displayed on the display screen of the electronic device after being processed by the image processor. Alternatively, the electronic device can further include a memory. The digital signal can be stored in the memory after being processed by the image processor.

[0092] With the continuous improvement of imaging quality, the size of the photosensitive chip 15 is getting larger and larger. Based on the structure of the camera module 10 shown in FIG. 1, the height of the rear 45° prism 14 will also increase with the increase of the size of the photosensitive chip 15. Based on this, referring to FIG. 2, after the camera module 10 is installed to the electronic device, with the increase of the height of the rear 45° prism 14, the height B of the camera module 10 close to the image side also increases. It should be noted that the height B here is the sum of the height of the rear 45° prism, the gap between the rear 45° prism and the photosensitive chip 15, and the size of the photosensitive chip 15 in the thickness direction of the electronic device. The camera module 10 needs more space for arrangement, which further increases the thickness H between the rear cover 20 and the display screen 30 in the electronic device. The image side refers to the side of the camera module 10 close to the imaging surface of the photosensitive chip 15.

[0093] As can be seen, the thickness of the camera module 10 close to the image side has become the main factor affecting the miniaturization of the electronic device. How to effectively reduce the thickness of the camera module 10 in the electronic device has become a problem to be solved.

[0094] In view of the technical problem of high thickness of the camera module close to the image side in the prior art, the embodiment of the present application provides a camera module. In the camera module, the included angle between the optical axis of the lens group 101 and the photosensitive chip 200 is set to an acute angle, so that the photosensitive chip 200 can be inclinedly arranged in the electronic device. Then, the light rays entering the first prism 102 through the lens group 101 are projected to the photosensitive chip 200 after being reflected at least twice by the first prism 102, so as to realize imaging. Such a structure design effectively breaks the limitation of the size of the photosensitive chip 200 on the thickness of the periscope lens (including the lens group 101 and the first prism 102) in the structure design of FIG. 1 or FIG. 2, effectively reduces the thickness of the camera module close to the image side, and further reduces the thickness of the electronic device, which is conducive to the miniaturization development of the electronic device.

[0095] The camera module provided by the embodiment of the present application can be applied to various electronic devices, including but not limited to a camera, a phone, a personal digital assistant, a tablet computer, a vehicle-mounted computer, a laptop computer, a smart screen, an ultra-mobile personal computer (UMPC), a handheld device, a smart watch, a driving record device, a monitoring device, and other devices with camera and photographing functions.

[0096] It should be understood that the electronic device can further include a shell, and the camera module provided by the embodiment of the present application is arranged in the shell.

[0097] In the embodiments of the present application, the lens assembly 100 can be a straight lens or a periscope lens, which will be described respectively in the following embodiments. It should be understood that, in the case that the lens assembly 100 is a straight lens, the straight lens generally refers to a lens assembly 100 whose optical axis direction is the same as the light entering direction of the lens group 101. The embodiments of the present application can further reduce the thickness of the electronic device, facilitating the thinning of the electronic device.

[0098] As shown in FIG. 3, FIG. 3 is a schematic diagram of the cross-sectional structure of a camera module provided by an embodiment of the present application. Referring to FIG. 3, the camera module includes a lens assembly 100 and a photosensitive chip 200, wherein the lens assembly 100 includes a lens group 101 and a first prism 102, the first prism 102 is located on the image side of the lens group 101, and the photosensitive chip 200 is located on the image side of the first prism 102. Wherein, the image side can refer to the side on which the image generated by the camera module is located.

[0099] In the embodiments of the present application, the lens group 101 is used for optically processing the light of the object, and the light emitted by the lens group 101 is incident into the first prism 102.

[0100] It should be understood that the lens group 101 can include at least one optical lens. For example, the number of optical lenses in the lens group 101 can be three, four, five or six, etc. Referring to FIG. 3, the lens group 101 of the camera module includes three optical lenses, which are a first lens 1011, a second lens 1012 and a third lens 1013.

[0101] In a possible implementation, the lens group 101 can include a first lens group, and the focal length of the first lens group is positive.

[0102] It should be understood that the first lens group included in the lens group 101 can refer to a lens group formed by grouping the optical lenses in the lens group 101.

[0103] In a possible implementation, by moving the first lens group in the lens group 101, the camera module can realize the automatic focus (AF) function. For example, referring to FIG. 3, the first lens 1011, the second lens 1012 and the third lens 1013 can be divided into a lens group, i.e., the first lens 1011, the second lens 1012 and the third lens 1013 constitute a first lens group, and the first lens group can move relative to the photosensitive chip 200 to realize the AF function of the camera module.

[0104] In the above examples, the lens group 101 can include one first lens group. When the lens group 101 includes one first lens group, the overall focal length of the first lens group (i.e., the lens group 101) can be positive.

[0105] Referring to FIG. 3, the first lens group can be composed of the first lens 1011, the second lens 1012, and the third lens 1013, the overall focal length of the first lens group (i.e., the lens group 101) can be positive, and the focal length of the first lens group can be 11.5 mm (millimeters).

[0106] Further, in the above examples, the first lens 1011 in the lens group 101 can be a positive lens, the second lens 1012 can be a negative lens, and the third lens 1013 can be a positive lens or a negative lens.

[0107] According to different optical zooming requirements, the lens group 101 can also include multiple first lens groups, that is, the number of first lens groups in the lens group 101 can be multiple.

[0108] In the embodiments of the present application, the three optical lenses in the lens group 101 shown in FIG. 3 can be divided into two first lens groups.

[0109] For example, the first lens 1011 and the second lens 1012 can be divided into a first lens group, and the third lens 1013 can be divided into another first lens group, the focal lengths of the above two first lens groups can be positive, and the AF function can be realized by moving any one of the two first lens groups relative to the photosensitive chip 200.

[0110] Of course, in addition to the first lens group, the lens group 101 can also include other lens groups.

[0111] For example, the lens group 101 can also include a second lens group. In some embodiments, the focal length of the second lens group can be negative.

[0112] Still taking FIG. 3 as an example, the first lens 1011 and the second lens 1012 can be divided into a first lens group, and the third lens 1013 can be divided into a second lens group, wherein the focal length of the first lens group composed of the first lens 1011 and the second lens 1012 is positive, the focal length of the second lens group (i.e., the third lens 1013) is negative, and the AF function can be realized by moving the first lens group or the second lens group relative to the photosensitive chip 200.

[0113] It should be noted that the number of lens group groups in the lens group 101, the number of first lens groups in the lens group 101, the number of optical lenses in the first lens group, and the positive or negative of the focal length of each lens group can be set according to the optical zoom requirements of different camera modules or lens assemblies 100, and the embodiments of the present application do not make any limitation thereto.

[0114] In a possible implementation, the specific shape of each lens in the lens group 101 provided by the embodiments of the present application satisfies the following curve equation (1):

[0115] In the above curve equation (1), z represents the optical surface height of the lens; c represents the radius of curvature of the lens; r represents the height of the lens along the optical axis direction; k represents the conic coefficient; A i represents the i-th order coefficient of the lens; r i represents the normalized radial coordinate; i is 1, 2, 3,..., N, and N is a natural number set.

[0116] In the embodiments of the present application, the value of i can be 4, 6, 8, 10, 12, 14 and 16, and the value of the coefficient A i is A4, A6, A8, A 10 , A 12 , A 14 and A 16 .

[0117] As a feasible example, Table 1 provided by the embodiments of the present application is a set of design parameters corresponding to each lens in the lens group 101 shown in FIG. 3.

[0118] Table 1

[0119] In the above Table 1, OBJ represents the object photographed by the camera module; STO represents the diaphragm in the camera module. S1 to S14 show the face numbers corresponding to the increase of the surface from the object side surface of the first lens 1011 to the imaging surface of the photosensitive chip 200, and the face numbers increase one by one towards the image side. The object side refers to the side of the object to be photographed relative to the image side. The radius of curvature column shows the radius of curvature of the lens corresponding to the surface. The thickness column shows the distance between the surface and its adjacent surface on the optical axis. The refractive index column shows the refractive index of the lens corresponding to the surface. The Abbe number column shows the Abbe number of the lens corresponding to the surface.

[0120] Table 2 below provides a set of specific values of A i of each lens corresponding to Table 1. In Table 2, E is a scientific notation number, for example, E-06 represents 10 -6 .

[0121] Table 2

[0122] Based on the data in Table 1 and Table 2, in the process of specific design implementation, the focal length value of the lens group 101 in the camera module can be 11.5 mm; the aperture value Fno of the lens assembly 100 composed of the lens group 101 and the first prism 102 in the camera module is 2.2; and the field of view FOV of the lens assembly 100 composed of the lens group 101 and the first prism 102 is 36°.

[0123] Optionally, a diaphragm can also be arranged on the side of the lens group 101 away from the photosensitive chip 200 (i.e., the side close to the light entrance surface of the lens group 101) to better control the amount of light entering the lens group 101 by using the diaphragm.

[0124] In the embodiment of the present application, the first prism 102 is used to reflect the light entering the first prism 102 twice in the first prism 102 and project the light after the two reflections to the photosensitive chip 200, so as to use the photosensitive chip 200 to perform imaging processing on the light projected to the photosensitive chip 200, thereby realizing the imaging function.

[0125] As shown in FIG. 4, it is a cross-sectional schematic view of the first prism 102 being a three-prism when corresponding to FIG. 3, provided by an embodiment of the present application. In the embodiment of the present application, the first prism 102 can be a three-prism.

[0126] Specifically, referring to FIG. 4, the first prism 102 can include a first optical surface 1021, a second optical surface 1022 and a third optical surface 1023 which are not parallel to each other, the first optical surface 1021, the second optical surface 1022 and the third optical surface 1023 are connected to each other, the first optical surface 1021 is arranged opposite to the light exit surface of the lens group 101 to serve as the light entrance surface of the first prism 102, the third optical surface 1023 serves as the light exit surface of the first prism 102, the light entering the first prism 102 from the first optical surface 1021 is reflected twice in the first prism 102, and the light after the two reflections is emitted from the third optical surface 1023 out of the first prism 102.

[0127] In the embodiment of the present application, the light entering the first prism 102 is reflected twice in the first prism 102. Based on this, the optical path length of the light in the lens assembly 100 can be effectively prolonged, which is convenient for aberration correction to obtain high-quality images and further improves the imaging effect.

[0128] It should be noted that the first prism 102 can also be cut to be a four-prism without affecting the effective optical path of the light in the first prism 102. Based on this, the first prism 102 can also be a four-prism. As shown in FIG. 5, another cross-sectional view of the first prism 102 provided by an embodiment of the present application is shown when the first prism 102 is a four-prism. Referring to FIG. 5, the second optical surface 1022 and the third optical surface 1023 in the first prism 102 can be cut to change the first prism 102 from a three-prism to a four-prism.

[0129] Of course, the first optical surface 1021 and the second optical surface 1022 of the first prism 102 can also be cut to change the first prism 102 from a three-prism to a four-prism; or the first optical surface 1021 and the third optical surface 1023 of the first prism 102 can be cut to change the first prism 102 from a three-prism to a four-prism.

[0130] In other possible embodiments, the first prism 102 can also be other prisms. For example, based on FIG. 5, the first optical surface 1021 and the second optical surface 1022 of the first prism 102 can be further cut to change the first prism 102 from a four-prism to a five-prism; or based on FIG. 5, assuming that the optical surface between the second optical surface 1022 and the third optical surface 1023 of the first prism 102 is referred to as optical surface A, the optical surface A and the second optical surface 1022 can also be cut to change the first prism 102 from a four-prism to a five-prism; or the optical surface A and the third optical surface 1023 can be further cut to change the first prism 102 from a four-prism to a five-prism, and so on. The specific shape of the first prism 102 is not limited in the present application.

[0131] It is worth noting that in the actual processing process, in order to avoid the first prism 102 from cracking, at least one structure of chamfer, round, groove, and protrusion can be provided in the first prism 102.

[0132] It should be understood that the at least one structure of chamfer, round, groove, and protrusion can be formed by cutting the first optical surface 1021, and / or the second optical surface 1022, and / or the third optical surface 1023 of the first prism 102. Such a structure can effectively improve the yield of the first prism 102 and improve the practicability of the first prism 102.

[0133] Referring to FIG. 4 and FIG. 5, in the first prism 102, an included angle between the first optical surface 1021 and the second optical surface 1022 is a first angle a, an included angle between the first optical surface 1021 and the third optical surface 1023 is a second angle β, the second angle β is greater than the first angle a, the second optical surface 1022 serves as a first reflection surface, and the first optical surface 1021 serves as a second reflection surface. Light entering the first prism 102 from the first optical surface 1021 is reflected by the first reflection surface and the second reflection surface in sequence and then exits the first prism 102 from the third optical surface 1023.

[0134] It should be understood that the first optical surface 1021 is also an entrance surface of the first prism 102, that is, a surface through which light enters the first prism 102. As can be seen from FIG. 3 to FIG. 5, in the imaging process, both light transmission and total reflection occur in the first optical surface 1021. Similarly, the third optical surface 1023 corresponds to an exit surface of the first prism 102, that is, a surface through which light exits the first prism 102.

[0135] Referring to FIG. 4 and FIG. 5, the second optical surface 1022 of the first prism 102 is configured to reflect light incident on the second optical surface 1022. In a possible implementation, a reflection layer can be provided on the second optical surface 1022 to reflect light entering the second optical surface 1022.

[0136] In the embodiments of the present application, the first angle a and the second angle β satisfy the relationship (2): β = 2a (2)

[0137] In the above relationship (2), the first angle a can be less than 45°.

[0138] In some embodiments, the first angle a ranges from 28° to 32°. In the embodiment shown in FIG. 3, the first angle a is 32°, and based on the above relationship (2), the second angle β is 64°.

[0139] Based on the above possible implementation, the second angle β is determined as twice the first angle a, so that light vertically incident on the entrance surface of the first prism 102 can be vertically emitted from the exit surface of the first prism 102, effectively ensuring the imaging quality.

[0140] In other possible implementations, the first angle a and the second angle β can also satisfy the relationship: β = 1.98a. In actual applications, the relationship between the first angle a and the second angle β can be set within a predetermined range. It should be noted that if the first angle a and the second angle β have a large difference (for example, β = 1.5a), then when imaging is performed by using the camera module including the first prism 102, the image edge is prone to be blurred.

[0141] Optionally, the at least one structure of the chamfer, the fillet, the groove, and the protrusion provided in the first prism 102 can also correspond to the position of the first angle a and / or the second angle β in the first prism 102.

[0142] In the embodiment of the present application, the first angle a and the refractive index of the first prism 102 satisfy the relationship (3):

[0143] In the above relationship (3), Np represents the refractive index of the first prism 102.

[0144] In the embodiment of the present application, the refractive index of the first prism 102 is greater than 1.45. And / or, the Abbe number of the first prism 102 is greater than 18.

[0145] Based on the above possible implementation, the refractive index of the first prism 102 determines the degree of deflection of the light rays when propagating inside the first prism 102. When the value of the first angle a and the refractive index of the first prism 102 satisfy the above relationship (3), the deflection angle of the light rays in the first prism 102 can be controlled, so that as many light rays as possible entering the first prism 102 are totally reflected in the first prism 102, reducing the loss of light energy.

[0146] In one possible implementation, the structure shown in FIG. 3 can also be the actual state when the camera module performs infinite distance imaging.

[0147] Correspondingly, FIG. 6 is a vertical axis chromatic aberration diagram corresponding to the lens assembly 100 in the camera module shown in FIG. 3 provided by the embodiment of the present application. In FIG. 6, the abscissa represents the vertical axis chromatic aberration value; the ordinate represents the normalized field of view. The vertical axis chromatic aberration in FIG. 6 represents the focal point position of light rays of different wavelengths on the imaging surface, wherein the wavelengths of the light rays can include 650nm, 610nm, 555nm, 510nm, and 470nm. The smaller the vertical axis chromatic aberration, the better the convergence effect of the light rays of the corresponding wavelength on the imaging surface. As can be seen from FIG. 6, the vertical axis chromatic aberration of the lens assembly 100 in the camera module provided by the embodiment of the present application is controlled within a very small range.

[0148] FIG. 7 is a field curvature diagram corresponding to the lens assembly 100 in the camera module shown in FIG. 3 provided by the embodiment of the present application. In FIG. 7, the abscissa represents the field curvature value; the ordinate represents the field of view image height of 6.55mm. The greater the field curvature value, the greater the deviation of the point on the imaging surface from the ideal surface. According to FIG. 7, the field curvature value of the lens assembly 100 in the camera module provided by the embodiment of the present application is controlled within a very small range.

[0149] FIG. 8 is an optical distortion curve corresponding to the lens assembly 100 in the camera module shown in FIG. 3, according to an embodiment of the present application. In FIG. 8, the horizontal axis represents the percentage of distortion, and the vertical axis represents the field height of 6.55 mm. Distortion does not affect the sharpness of the image, but can cause image deformation. As can be seen from FIG. 8, the distortion of the lens assembly 100 according to an embodiment of the present application is controlled within a very small range (the distortion is less than 2%), and has a small effect on imaging.

[0150] It should be understood that the lens assembly 100 in FIGS. 6, 7, and 8 described above can include the lens group 101 and the first prism 102.

[0151] In a possible implementation, the lens assembly 100 described above can satisfy the relationship (4): IH>3mm (4)

[0152] In the relationship (4) described above, IH represents half of the diagonal length of the effective imaging area of the lens assembly 100, i.e., the imaging height.

[0153] In a possible implementation, the lens assembly 100 described above can also satisfy the relationship (5): Fno<5.0 (5)

[0154] In the relationship (5) described above, Fno represents the aperture value of the lens assembly 100.

[0155] In another possible implementation, the lens assembly 100 described above can also satisfy the relationship (6): FOV<60° (6)

[0156] In the relationship (6) described above, FOV represents the field of view of the lens assembly 100.

[0157] In other possible implementations, the lens assembly 100 described above can also satisfy the relationship (7): S>0.9*FL (7)

[0158] In the relationship (7) described above, S represents the optical path length of the light ray from the light entrance surface of the lens assembly 100 to the imaging surface of the photosensitive chip 200. Referring to FIG. 3, the light entrance surface of the lens assembly 100 can refer to the light entrance surface of the lens group 101. FL represents the focal length of the lens assembly 100.

[0159] Specifically, S is understood as the total optical path of the light ray from the object side surface of the first optical lens close to the object side in the lens assembly 100 to the imaging surface of the photosensitive chip 200.

[0160] Based on the camera module shown in FIG. 3, the value of S can be 15.2 mm.

[0161] In another example, the aforementioned lens assembly 100 can also satisfy the relationship (8): SP > 2*IH (8)

[0162] In the aforementioned relationship (8), SP represents the optical path length from the light-in surface of the first prism 102 to the light-out surface of the first prism 102. Referring to FIG. 4 or FIG. 5, SP is the total length of the light path from the first optical surface 1021, through the second optical surface 1022 and the reflection of the first optical surface 1021, to the third optical surface 1023. IH represents half of the diagonal length of the effective imaging area of the lens assembly 100, i.e., the imaging image height.

[0163] Based on the camera module shown in FIG. 3, the value of SP can be 10 mm; and the value of IH can be 3.6 mm.

[0164] Alternatively, the lens assembly 100 and the first prism 102 can also satisfy the relationship (9): Hp < 1.8*IH (9)

[0165] In the aforementioned relationship (9), Hp represents the height of the first prism 102. For example, referring to FIG. 4 or FIG. 5, the height of the first prism 102 in the camera module is h. IH represents half of the diagonal length of the effective imaging area of the lens assembly 100, i.e., the imaging image height.

[0166] Based on the camera module shown in FIG. 3, the value of Hp can be 4.5 mm.

[0167] In the embodiments of the present application, the lens assembly 100 composed of the lens group 101 and the first prism 102 can also satisfy the relationship (10):

[0168] In the aforementioned relationship (10), FL represents the focal length of the lens assembly 100. FBL represents the optical path length from the light-out surface of the lens group 101 to the photosensitive chip 200. It should be understood that, in the case that the light-out surface of the lens group 101 is a concave surface or a convex surface, FBL represents the optical path length from the optical axis position (or optical center) of the light-out surface of the lens group 101 to the photosensitive chip 200.

[0169] Further, FBL can also be understood as the length of the light path from the image side surface of the last optical lens close to the photosensitive chip 200 in the lens assembly 100 to the imaging surface of the photosensitive chip 200.

[0170] Based on the camera module shown in FIG. 3, the value of FBL can be 11.4 mm; the value of FL can be 11.5 mm; and the value of FBL / FL can be 0.991304.

[0171] Based on the possible implementation manner above, by optimizing the ratio between the FBL and the FL, the camera module can have a longer back focal length, the first prism 102 with a lower thickness can be arranged between the lens group 101 and the photosensitive chip 200, the light path can be folded more times, the optical path can be longer, the aberration correction can be facilitated, and a high-quality image can be obtained, so that the thickness of the camera module can be further reduced without affecting the optical imaging performance of the camera module.

[0172] In the embodiment of the present application, the photosensitive chip 200 can be arranged in parallel with the third optical surface 1023, and the included angle between the photosensitive chip 200 and the optical axis of the lens group 101 can be an acute angle.

[0173] It should be understood that arranging the photosensitive chip 200 in parallel with the third optical surface 1023 can increase the photosensitive area of the photosensitive chip 200, and is beneficial to improving the optical imaging performance of the camera module.

[0174] In the above embodiment, the acute angle between the photosensitive chip 200 and the optical axis of the lens group 101 can refer to the included angle formed between the optical axis of the lens group 101 and the imaging surface of the photosensitive chip 200. For example, in the structure of the camera module shown in FIG. 3, the direction of the optical axis of the lens group 101 is P (i.e., the vertical direction), the direction of the imaging surface of the photosensitive chip 200 is Q, and the acute angle between the optical axis of the lens group 101 and the photosensitive chip 200 is the included angle formed after P and Q intersect.

[0175] In addition, by arranging the acute angle between the optical axis of the lens group 101 and the photosensitive chip 200, the photosensitive chip 200 can be arranged in an inclined manner in the electronic device, the size of the photosensitive chip 200 is no longer limited to the thickness of the lens assembly 100, the thickness of the camera module close to the image side can be effectively reduced, and the thickness of the electronic device is further reduced.

[0176] It should be understood that the photosensitive chip 200 can be an image sensor. As an example but not limitation, the image sensor can be a charge-coupled device (CCD) image sensor, a phototransistor, a thin-film transistor, or a complementary metal-oxide-semiconductor (CMOS) image sensor. The type of the photosensitive chip 200 is not limited in the embodiment of the present application.

[0177] Optionally, the camera module can further include a filter, which is arranged between the first prism 102 and the photosensitive chip 200. The filter can be used to filter out unnecessary light, reduce stray light, and reduce the influence of unnecessary light on the imaging effect. For example, the filter can be used to filter out ultraviolet light, infrared light, and the like which are not easy to be observed by the human eye.

[0178] By way of example and not limitation, the filter can be an infrared cut filter, a red filter, a blue filter, a green filter, etc.

[0179] In yet another possible implementation, as shown in FIG. 9 is another cross-sectional structure schematic diagram of a camera module provided by the embodiments of the present application, referring to FIG. 9, the camera module includes: a lens assembly 100 and a photosensitive chip 200, wherein the lens assembly 100 can also include a lens group 101 and a first prism 102, the first prism 102 is located on the image side of the lens group 101, the lens group 101 is used to shoot the light rays emitted by the lens group 101 into the first prism 102; the first prism 102 is used to reflect the light rays entering the first prism 102 three times in the first prism 102, and project the light rays after three reflections to the photosensitive chip 200; the photosensitive chip 200 is located on the image side of the first prism 102, and the photosensitive chip 200 is used to image the light rays projected to the photosensitive chip 200; the angle between the optical axis of the lens group 101 and the photosensitive chip 200 in the camera module is also an acute angle.

[0180] The specific structure of each element in the camera module shown in FIG. 9 can be understood with reference to the structure of each element in the camera module shown in FIG. 3, and only the differences are described here. In the embodiments of the present application, the main difference from the embodiments described in the foregoing FIG. 3 is the number of optical lenses in the lens group 101 and the specific structure of the first prism 102.

[0181] Specifically, the lens group 101 of the camera module can include four optical lenses, which are a first lens 1011, a second lens 1012, a third lens 1013, and a fourth lens 1014.

[0182] In the above embodiments, the lens group 101 can also include a first lens group.

[0183] For example, referring to FIG. 9, the first lens 1011, the second lens 1012, the third lens 1013, and the fourth lens 1014 can be taken as a first lens group, and the first lens group (i.e. the lens group 101) can move relative to the photosensitive chip 200. In this case, the focal length of the first lens group (i.e. the lens group 101) is positive.

[0184] In the above embodiments, the lens group 101 can also include a plurality of first lens groups.

[0185] For example, referring to FIG. 9, the lens group 101 can include two first lens groups. Further, the first lens 1011, the second lens 1012, and the third lens 1013 can be divided into one first lens group, and the fourth lens 1014 can be divided into another first lens group, and AF function can be realized by moving any one of the first lens groups. Based on this, the focal length of the two first lens groups is positive.

[0186] In the embodiments of the present application, the lens group 101 can also include other lens groups. For example, the lens group 101 can also include a second lens group, and the focal length of the second lens group can be negative.

[0187] For example, referring to FIG. 9, the first lens 1011, the second lens 1012, and the third lens 1013 can be divided into a first lens group, and the fourth lens 1014 can be divided into a second lens group, and AF function can be realized by moving the first lens group or the second lens group. In the case where the first lens 1011, the second lens 1012, and the third lens 1013 are divided into a first lens group, and the fourth lens 1014 is divided into a second lens group, the focal length of the first lens group composed of the first lens 1011, the second lens 1012, and the third lens 1013 can be positive, and specifically, the focal length value of the first lens group can be 11 mm; the focal length of the second lens group composed of the fourth lens 1014 can be negative.

[0188] In the above example, the first lens 1011 and the second lens 1012 can be positive lenses, and the third lens 1013 and the fourth lens 1014 can be negative lenses.

[0189] It should be understood that the specific shape of each lens in the lens group 101 of the camera module shown in FIG. 9 also satisfies the curve equation (1) in the embodiments described in FIG. 3, and the embodiments of the present application will not be described here.

[0190] For example, Table 3 is a set of design parameters corresponding to each lens in the lens group 101 shown in FIG. 9 provided by the embodiments of the present application. Table 4 provides a set of A i values of each lens corresponding to Table 3 provided by the embodiments of the present application. The specific parameter descriptions in Tables 3 and 4 can refer to the related introduction of the embodiments described in FIG. 3, and will not be described here.

[0191] Based on the data in Tables 3 and 4, in the specific design implementation process, the focal length value of the lens group 101 in the camera module is 14.2 mm, the aperture value Fno of the lens assembly 100 composed of the lens group 101 and the first prism 102 is 2.5, and the field of view FOV of the lens assembly 100 composed of the lens group 101 and the first prism 102 is 26°.

[0192] FIG. 10 shows a schematic diagram of a cross-sectional structure of a first prism 102 according to an embodiment of the present application. As shown in FIG. 10, the first prism 102 can be a four-prism according to an embodiment of the present application.

[0193] It should be understood that Table 3 above provides a set of design parameters corresponding to each lens in the lens group 101 shown in FIG. 9 according to an embodiment of the present application. Table 4 below provides a set of A values corresponding to each lens in Table 3 according to an embodiment of the present application. i and the specific values of the design parameters.

[0194] Specifically, the first prism 102 can include a first optical surface 1021, a second optical surface 1022, a third optical surface 1023, and a fourth optical surface 1024. The first optical surface 1021 and the fourth optical surface 1024 are oppositely arranged, and the second optical surface 1022 and the third optical surface 1023 are oppositely arranged. The first optical surface 1021, the third optical surface 1023, the fourth optical surface 1024, and the second optical surface 1022 are sequentially connected to enclose the first prism 102. The second optical surface 1022 is connected between the first optical surface 1021 and the fourth optical surface 1024, and the third optical surface 1023 is also connected between the first optical surface 1021 and the fourth optical surface 1024.

[0195] Table 3

[0196] Table 4

[0197] Continued Table 4

[0198] The second optical surface 1022 can serve as a first reflection surface, the first optical surface 1021 can serve as a second reflection surface, and the fourth optical surface 1024 can serve as a third reflection surface. Light entering the first prism 102 from the first optical surface 1021 is sequentially reflected by the first reflection surface, the second reflection surface, and the third reflection surface, and then exits the first prism 102 from the third optical surface 1023.

[0199] In a possible implementation, the first optical surface 1021 can be arranged in parallel with the fourth optical surface 1024. Based on this implementation, the deformation of the first prism 102 caused by factors such as mechanical vibration or temperature change can be effectively reduced, thereby ensuring the stability of the optical performance of the first prism 102 under complex environmental conditions. In addition, the parallel arrangement of the two opposite optical surfaces in the first prism 102 also helps to reduce distortion and distortion during imaging, thereby improving the clarity and accuracy of imaging, and facilitating the manufacturing and installation of the first prism 102.

[0200] In another possible implementation, the four-prism described above can also be cut to obtain a five-prism as shown in FIG. 11 or FIG. 12 without affecting the effective optical path of the light rays in the first prism 102. The five-prism shown in FIG. 11 or FIG. 12 can also be cut to obtain a six-prism as shown in FIG. 13, and so on.

[0201] Of course, in some embodiments, the first prism 102 can also be a five-prism as shown in FIG. 11 or FIG. 12 or a six-prism as shown in FIG. 13 directly.

[0202] In other possible implementations, the first prism 102 can also be a six-prism as shown in FIG. 9. In this example, other optical surfaces can also be arranged between the first optical surface 1021 and the second optical surface 1022, and other optical surfaces can also be arranged between the first optical surface 1021 and the third optical surface 1023. It can be understood that the other optical surfaces can be at least one of a chamfer, a fillet, a groove, and a protrusion.

[0203] Similarly, the first prism 102 can also be other multi-sided prisms, and the specific structure of the first prism 102 and the corresponding cross-sectional shape are not limited in the present application.

[0204] In the embodiments of the present application, the included angle between the first optical surface 1021 and the second optical surface 1022 is a first angle a, and the included angle between the third optical surface 1023 and the fourth optical surface 1024 is a second angle β, and the second angle β is greater than the first angle a, wherein the values of the first angle a and the second angle β also satisfy the relationship (2) in the foregoing embodiments.

[0205] In the embodiments of the present application, the value of the first angle a can be 28°, and based on the relationship (2) in the foregoing embodiments, the value of the second angle β can be 56°.

[0206] In the embodiments of the present application, the relationship (3) in the foregoing embodiments is also satisfied between the refractive index of the first prism 102 and the first angle a, and the detailed description of the relationship (3) can be referred to the related description in the foregoing embodiments, which will not be described herein again.

[0207] In the embodiments of the present application, the structure shown in FIG. 9 can be the actual state when the camera module performs infinite distance imaging.

[0208] FIG. 14 is a graph of the axial chromatic aberration of the lens assembly 100 in the camera module shown in FIG. 9 according to an embodiment of the present application. The horizontal axis represents the axial chromatic aberration value, and the vertical axis represents the normalized field of view. In FIG. 14, the axial chromatic aberration represents the focal point positions of light rays of different wavelengths on the imaging surface. The wavelengths of the light rays can include 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm. The smaller the axial chromatic aberration, the better the convergence effect of the light rays of the corresponding wavelengths on the imaging surface. As shown in FIG. 14, the axial chromatic aberration of the lens assembly 100 in the camera module according to the embodiment of the present application is controlled within a very small range.

[0209] FIG. 15 is a graph of the astigmatism field curvature of the lens assembly 100 in the camera module shown in FIG. 9 according to an embodiment of the present application. The horizontal axis represents the astigmatism field curvature value, and the vertical axis represents the field image height of 6.55 mm. The larger the astigmatism field curvature value, the greater the deviation of the point on the imaging surface from the ideal surface. According to FIG. 15, the astigmatism field curvature value of the lens assembly 100 in the camera module according to the embodiment of the present application is controlled within a very small range.

[0210] FIG. 16 is a graph of the optical distortion of the lens assembly 100 in the camera module shown in FIG. 9 according to an embodiment of the present application. The horizontal axis represents the distortion percentage, and the vertical axis represents the field image height of 6.55 mm. Distortion does not affect the clarity of imaging, but can cause image deformation. As shown in FIG. 16, the distortion of the lens assembly 100 according to the embodiment of the present application is controlled within a very small range (the distortion is less than 2%), and has little effect on imaging.

[0211] It should be understood that the lens assembly 100 composed of the lens group 101 and the first prism 102 in the embodiment of the present application also satisfies the relationship (4) to the relationship (10) in the foregoing embodiments. For details of the relationship (4) to the relationship (10), reference can be made to the related descriptions in the foregoing embodiments, which will not be described herein again.

[0212] It should be noted that in the foregoing relationship (9), the setting height of the first prism 102 in the camera module can refer to h in FIGS. 9 to 13.

[0213] The focal length FL of the lens assembly 100 composed of the lens group 101 and the first prism 102 in the camera module shown in FIG. 9 is 14.2 mm. The light path length S from the light entrance surface of the lens assembly 100 to the photosensitive chip 200 is 18.8 mm. The light path length FBL from the light exit surface of the lens group 101 to the photosensitive chip 200 in the lens assembly 100 is 14.5 mm. The value of FBL / FL is 1.021127. The light path length SP from the light entrance surface of the first prism 102 to the light exit surface of the first prism 102 is 13.3 mm. The imaging height IH is 3.6 mm. The height Hp of the first prism 102 is 3.8 mm.

[0214] In the embodiments of the present application, the angle between the optical axis of the lens group 101 and the photosensitive chip 200 is also an acute angle. For example, in the structure of the camera module shown in FIG. 9, the direction of the optical axis of the lens group 101 is M (i.e., the vertical direction), and the direction of the imaging surface of the photosensitive chip 200 is N. The acute angle between the optical axis of the lens group 101 and the photosensitive chip 200 is the angle formed after the intersection of M and N.

[0215] In another possible implementation, in the case that the lens assembly 100 is a periscopic lens, in order to further reduce the thickness of the electronic device, a second prism 103 can also be arranged in the camera module.

[0216] Specifically, FIG. 17 is a structural schematic diagram of another camera module provided by the embodiments of the present application. As shown in FIG. 17, the camera module includes a lens assembly 100 and a photosensitive chip 200. The lens assembly 100 can include a lens group 101, a first prism 102 and a second prism 103. The first prism 102 is located on the image side of the lens group 101. The photosensitive chip 200 is located on the image side of the first prism 102. The second prism 103 has an included angle between the light entrance surface and the light exit surface of the second prism 103. The lens group 101 is located on the image side of the second prism 103. The light entrance surface of the lens group 101 is arranged opposite to the light exit surface of the second prism 103. The angle between the optical axis of the lens group 101 and the photosensitive chip 200 in the camera module is also an acute angle.

[0217] It should be understood that the second prism 103 is used to project the light entering the second prism 103 to the lens group 101. The lens group 101 is used to project the light exiting the lens group 101 into the first prism 102. The first prism 102 is used to reflect the light entering the first prism 102 twice in the first prism 102 and project the light after the two reflections to the photosensitive chip 200. The photosensitive chip 200 is used to perform imaging processing on the light projected to the photosensitive chip 200.

[0218] It is understandable that the light entering the second prism 103 is sequentially reflected by the light-in surface of the second prism 103 and the reflecting surface of the second prism 103, and then is emitted from the light-out surface of the second prism 103. The reflecting surface of the second prism 103 can change the direction of the light entering the reflecting surface.

[0219] Optionally, the second prism 103 can be a 45° prism. In the case that the second prism 103 is a 45° prism, the angle between the light-in surface of the second prism 103 and the light-out surface of the second prism 103 is 90°.

[0220] The camera module shown in FIG. 17 is different from the embodiment described in FIG. 3 mainly in the number of optical lenses in the lens group 101, the specific structure of the first prism 102, the arrangement relationship between the photosensitive chip 200 and the first prism 102, and the arrangement of the second prism 103 in the camera module.

[0221] In the embodiment of the present application, the lens group 101 can include six optical lenses, i.e., the first lens 1011, the second lens 1012, the third lens 1013, the fourth lens 1014, the fifth lens 1015, and the sixth lens 1016.

[0222] In the above embodiment, the lens group 101 can also include a first lens group.

[0223] For example, referring to FIG. 17, the six optical lenses in the lens group 101 can be regarded as a first lens group, and the first lens group can be moved relative to the photosensitive chip 200 to realize the AF function of the camera module.

[0224] In the above embodiment, the lens group 101 can also include a plurality of first lens groups.

[0225] For example, referring to FIG. 17, the lens group 101 can include two first lens groups. Further, the first lens 1011, the second lens 1012, and the third lens 1013 can be divided into a first lens group, and the fourth lens 1014, the fifth lens 1015, and the sixth lens 1016 can be divided into another first lens group, and the AF function can be realized by moving any one of the two first lens groups.

[0226] Based on the above example, in the case that the first lens 1011, the second lens 1012, and the third lens 1013 are divided into a first lens group, and the fourth lens 1014, the fifth lens 1015, and the sixth lens 1016 are divided into another first lens group, the focal lengths of the two first lens groups can be positive.

[0227] In the embodiment, the lens group 101 can also include other lens groups. For example, the lens group 101 can also include a second lens group, and the focal length of the second lens group can be negative.

[0228] By way of example but not limitation, the first lens 1011, the second lens 1012, and the third lens 1013 can be classified as a first lens group, and the fourth lens 1014, the fifth lens 1015, and the sixth lens 1016 can be classified as a second lens group. The AF function can be implemented by moving the first lens group or the second lens group. In this case, the focal length of the first lens group composed of the first lens 1011, the second lens 1012, and the third lens 1013 can be positive, and specifically, the focal length value can be 11.7 mm. The focal length of the second lens group composed of the fourth lens 1014, the fifth lens 1015, and the sixth lens 1016 can be negative.

[0229] In the embodiment, the first lens 1011, the third lens 1013, and the fifth lens 1015 can be positive lenses, and the second lens 1012, the fourth lens 1014, and the sixth lens 1016 can be negative lenses.

[0230] It should be understood that the specific shape of each lens in the lens group 101 of the camera module shown in FIG. 17 also satisfies the curve equation (1) in the embodiment described in FIG. 3, and the embodiment of the present application will not be described here.

[0231] By way of example, Table 5 below provides a set of design parameters corresponding to each lens in the lens group 101 shown in FIG. 17 according to an embodiment of the present application. Table 6 provides a set of A i values of each lens corresponding to Table 5 according to an embodiment of the present application. The specific parameter descriptions in Tables 5 and 6 can refer to the related descriptions of the embodiment described in FIG. 3, and the embodiment of the present application will not be described here.

[0232] Table 5

[0233] Based on the data in Tables 5 and 6, in the specific design implementation process, the focal length value of the lens group 101 in the camera module is 26 mm. The aperture value Fno of the lens assembly 100 composed of the lens group 101, the first prism 102, and the second prism 103 in the camera module is 2.2. The field of view FOV of the lens assembly 100 composed of the lens group 101, the first prism 102, and the second prism 103 is 26°.

[0234] FIG. 18 shows a cross-sectional structure of a first prism 102 according to an embodiment of the present application. Referring to FIG. 18, in the embodiment, the first prism 102 can also be a three-prism.

[0235] Specifically, the first prism 102 can include first, second and third optical surfaces 1021, 1022 and 1023, which are not parallel to each other, and are connected to each other in pairs. The first optical surface 1021 is arranged opposite to the light exit surface of the lens group 101 as the light entrance surface of the first prism 102. The light rays entering the first prism 102 from the first optical surface 1021 are reflected twice in the first prism 102, and the third optical surface 1023 is the light exit surface of the first prism 102.

[0236] In the embodiment, the third optical surface 1023 can be a first reflection surface, and the second optical surface 1022 can be a second reflection surface. The light rays entering the first prism 102 from the first optical surface 1021 are reflected by the first and second reflection surfaces in sequence and then exit the first prism 102 from the third optical surface 1023.

[0237] It can be understood that the third optical surface 1023 in the first prism 102 has both light transmission and total reflection.

[0238] Optionally, a reflective layer can also be arranged on the second optical surface 1022 to reflect the light rays entering the second optical surface 1022.

[0239] Without affecting the effective optical path of the light rays in the first prism 102, the three-prism shown in FIG. 18 can also be cut to obtain a four-prism as shown in FIGS. 19 and 20. Alternatively, the four-prism shown in FIGS. 19 and 20 can be further cut to obtain a five-prism as shown in FIG. 21. Alternatively, the three-prism shown in FIG. 18 can be directly cut to obtain a five-prism as shown in FIG. 21, and so on.

[0240] Similarly, the first prism 102 can also be a four-prism as shown in FIGS. 19 and 20, or a five-prism as shown in FIG. 21.

[0241] Optionally, the first prism 102 can also be other polygonal prisms, and the specific structure and corresponding cross-sectional shape of the first prism 102 are not limited in the present application.

[0242] Optionally, at least one structure of chamfer, round, groove and protrusion can also be arranged in the first prism 102.

[0243] Table 6

[0244] Table 6 (continued)

[0245] Table 6 (continued)

[0246] It should be understood that Table 6 provides a set of A values for each lens corresponding to Table 5 for the embodiments of the present application. i The specific values of the first angle a and the second angle b satisfy the relationship (2) in the foregoing embodiments.

[0247] In the embodiments of the present application, the included angle between the second optical surface 1022 and the third optical surface 1023 is the first angle a, and the included angle between the first optical surface 1021 and the third optical surface 1023 is the second angle b, and the second angle b is greater than the first angle a. The values of the first angle a and the second angle b also satisfy the relationship (2) in the foregoing embodiments.

[0248] In the embodiments of the present application, the value of the first angle a can be 29°; based on the relationship (2) in the foregoing embodiments, the value of the second angle b can be 58°.

[0249] In the embodiments of the present application, the relationship (3) in the foregoing embodiments is also satisfied between the refractive index of the first prism 102 and the first angle a, and the detailed content of the relationship (3) can be referred to the related description in the foregoing embodiments, which will not be described herein again.

[0250] In the embodiments of the present application, the camera module shown in FIG. 17 can be the actual state of the lens assembly 100 composed of the lens group 101, the first prism 102 and the second prism 103 when imaging at infinity.

[0251] FIG. 22 is a vertical axial chromatic aberration diagram corresponding to the lens assembly 100 in the camera module shown in FIG. 17 provided by the embodiments of the present application. The abscissa represents the vertical axial chromatic aberration value; the ordinate represents the normalized field of view. The vertical axial chromatic aberration in FIG. 22 represents the focal point position of light rays of different wavelengths on the imaging surface, wherein the wavelengths of the light rays can include 650nm, 610nm, 555nm, 510nm and 470nm. The smaller the vertical axial chromatic aberration, the better the convergence effect of the light rays of the corresponding wavelengths on the imaging surface. As can be seen from FIG. 22, the vertical axial chromatic aberration of the lens assembly 100 in the camera module provided by the embodiments of the present application is controlled within a very small range.

[0252] FIG. 23 is a field curvature diagram corresponding to the lens assembly 100 in the camera module shown in FIG. 17 provided by the embodiments of the present application. The abscissa represents the field curvature value; the ordinate represents the field of view image height of 6.55mm. The greater the field curvature value, the greater the deviation of the point on the imaging surface from the ideal surface. According to FIG. 23, the field curvature value of the lens assembly 100 in the camera module provided by the embodiments of the present application is controlled within a very small range.

[0253] FIG. 24 is an optical distortion curve corresponding to the lens assembly 100 in the camera module shown in FIG. 17, according to an embodiment of the present application. In FIG. 24, the horizontal axis represents the percentage of distortion, and the vertical axis represents the field height of 6.55 mm. Distortion does not affect the sharpness of the image, but can cause image deformation. As can be seen from FIG. 24, the distortion of the lens assembly 100 according to the embodiment of the present application is controlled within a very small range (the distortion is less than 2%), and has less impact on imaging.

[0254] It should be understood that the lens assembly 100 composed of the lens group 101, the first prism 102, and the second prism 103 in the embodiment of the present application also satisfies the relationship (4) to the relationship (10) in the foregoing embodiments, and the detailed content of the relationship (4) to the relationship (10) can be referred to the related description of the foregoing embodiments, which will not be described herein again.

[0255] It should be understood that the lens assembly 100 composed of the lens group 101, the first prism 102, and the second prism 103 in the embodiment of the present application also satisfies the relationship (4) to the relationship (10) in the foregoing embodiments, and the detailed content of the relationship (4) to the relationship (10) can be referred to the related description of the foregoing embodiments, which will not be described herein again.

[0256] It should be understood that in the camera module shown in FIG. 17, the lens assembly 100 is composed of the lens group 101, the first prism 102, and the second prism 103, and the focal length FL of the lens assembly 100 is 26 mm. The optical path length S from the light entrance surface of the second prism 103 to the photosensitive chip 200 in the lens assembly 100 is 27.6 mm. The optical path length FBL from the light exit surface of the lens group 101 to the photosensitive chip 200 in the lens assembly 100 is 15.5 mm. The value of FBL / FL is 0.596154. The optical path length SP from the light entrance surface of the first prism 102 to the light exit surface of the first prism 102 is 13 mm. The imaging height IH is 6.25 mm. The height Hp of the first prism 102 is 7.8 mm.

[0257] In the embodiment of the present application, the angle between the optical axis of the lens group 101 and the photosensitive chip 200 is also an acute angle. For example, in the structure of the camera module shown in FIG. 17, the direction of the optical axis of the lens group 101 is X (i.e., the vertical direction), and the direction of the imaging surface of the photosensitive chip 200 is Y. The acute angle between the optical axis of the lens group 101 and the photosensitive chip 200 is the angle formed after the intersection of X and Y.

[0258] In yet another possible implementation, as shown in FIG. 25, which is a structural schematic diagram of yet another camera module provided in the embodiments of the present application, referring to FIG. 25, the camera module includes a lens assembly 100 and a photosensitive chip 200, wherein the lens assembly 100 includes a lens group 101, a first prism 102, a second prism 103, and an entrance lens 104, the first prism 102 is located on the image side of the lens group 101, and the entrance lens 104 is located on the object side of the second prism 103; the photosensitive chip 200 is located on the image side of the first prism 102, the second prism 103 has an included angle between the light entrance surface and the light exit surface, the lens group 101 is located on the image side of the second prism 103, and the light entrance surface of the lens group 101 is oppositely arranged with the light exit surface of the second prism 103. In the camera module, the included angle between the optical axis of the lens group 101 and the photosensitive chip 200 is also an acute angle.

[0259] It should be understood that the entrance lens 104 is used to project the light entering the entrance lens 104 to the second prism 103; the second prism 103 is used to project the light entering the second prism 103 to the lens group 101; the lens group 101 is used to project the light exiting the lens group 101 into the first prism 102; the first prism 102 is used to reflect the light entering the first prism 102 twice in the first prism 102 and project the light after the two reflections to the photosensitive chip 200; and the photosensitive chip 200 is used to perform imaging processing on the light projected to the photosensitive chip 200.

[0260] Compared with the camera module shown in FIG. 17, the camera module shown in FIG. 25 can further include the entrance lens 104. The specific structure of each element in the camera module shown in FIG. 25 can be understood with reference to the structure of each element in the camera module described in FIG. 17, which will not be repeated here.

[0261] The lens group 101 of the camera module can also include six optical lenses, which are a first lens 1011, a second lens 1012, a third lens 1013, a fourth lens 1014, a fifth lens 1015, and a sixth lens 1016.

[0262] In the above embodiments, the lens group 101 can also include a first lens group.

[0263] In the above embodiments, the lens group 101 can also include a plurality of first lens groups.

[0264] In the embodiments of the present application, the lens group 101 can also include other lens groups. For example, the lens group 101 can also include a second lens group, and the focal length of the second lens group can be negative.

[0265] By way of example and not limitation, the first lens 1011, the second lens 1012, and the third lens 1013 can be grouped into a first lens group, and the fourth lens 1014, the fifth lens 1015, and the sixth lens 1016 can be grouped into a second lens group, based on which, the focal length of the first lens group composed of the first lens 1011, the second lens 1012, and the third lens 1013 can be positive, specifically, the focal length value can be 16.3 mm; the focal length of the second lens group composed of the fourth lens 1014, the fifth lens 1015, and the sixth lens 1016 can be negative.

[0266] In this embodiment, the first lens 1011, the third lens 1013, and the fifth lens 1015 can be positive lenses; the second lens 1012, the fourth lens 1014, and the sixth lens 1016 can be negative lenses.

[0267] It should be understood that the specific shape of each lens in the lens group 101 of the camera module shown in FIG. 25 also satisfies the curve equation (1) in the embodiment described in FIG. 3, and the embodiments of the present application will not be described here.

[0268] Table 7

[0269] For example, Table 7 provides a set of design parameters corresponding to each lens in the lens group 101 shown in FIG. 25 according to an embodiment of the present application. Table 8 provides a set of A i values of each lens corresponding to Table 7 according to an embodiment of the present application. The specific parameter descriptions in Tables 7 and 8 can refer to the related descriptions of the foregoing embodiments, and the embodiments of the present application will not be described here.

[0270] Based on the data in Tables 7 and 8, in the specific design implementation process, the focal length value of the lens group 101 in the camera module is 26 mm, the aperture value Fno of the lens assembly 100 composed of the lens group 101, the first prism 102, the second prism 103, and the entrance lens 104 in the camera module is 2.2, and the field of view FOV of the lens assembly 100 composed of the lens group 101, the first prism 102, the second prism 103, and the entrance lens 104 is 26°.

[0271] In an embodiment of the present application, the first prism 102 can also be any one of a three-prism, a four-prism, or a five-prism. The specific structure of the first prism 102, the reflection of light in the first prism 102, and the specific content of the second optical surface 1022 and the third optical surface 1023 in the embodiment of the present application can refer to the related descriptions in the embodiment described in FIG. 17, and will not be described here.

[0272] In the embodiment of the present application, the included angle between the second optical surface 1022 and the third optical surface 1023 is the first angle a, the included angle between the first optical surface 1021 and the third optical surface 1023 is the second angle β, and the second angle β is greater than the first angle a. The values of the first angle a and the second angle β also satisfy the relationship (2) in the foregoing embodiment.

[0273] Referring to FIG. 25, the value of the first angle a can be 30°; based on the relationship (2) in the foregoing embodiment, the value of the second angle β can be 60°. At this time, the sum of the values of the first angle a and the second angle β is equal to 90°.

[0274] In the embodiment of the present application, the relationship (3) in the foregoing embodiment is also satisfied between the refractive index of the first prism 102 and the first angle a, and the detailed content of the relationship (3) can be referred to the related description in the foregoing embodiment, which will not be described herein again.

[0275] In this embodiment, in the actual shooting process, the distance between the incident lens 104 and the object in the camera module can be less than 100 mm.

[0276] Table 8

[0277] Table 8 (continued)

[0278] Table 8 (continued)

[0279] In the embodiment of the present application, the structure shown in FIG. 25 can be the actual state of the camera module when imaging at infinity.

[0280] It should be understood that Table 8 provides a set of A i values of each lens corresponding to Table 7 in the embodiment of the present application.

[0281] FIG. 26 is a vertical axis chromatic aberration diagram corresponding to the lens assembly 100 in the camera module shown in FIG. 25 provided by the embodiment of the present application. In FIG. 26, the horizontal axis represents the value of the vertical axis chromatic aberration, and the vertical axis represents the normalized field of view. The vertical axis chromatic aberration in FIG. 14 represents the focal point position of light rays of different wavelengths on the imaging surface, wherein the wavelengths of the light rays can include 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm. The smaller the vertical axis chromatic aberration, the better the convergence effect of the corresponding wavelength of light on the imaging surface. As can be seen from FIG. 26, the vertical axis chromatic aberration of the lens assembly 100 in the camera module provided by the embodiment of the present application is controlled within a very small range.

[0282] FIG. 27 is a field curvature graph of the lens assembly 100 in the camera module according to the embodiment of the present application. The horizontal axis represents the field curvature value, and the vertical axis represents the field height of 6.55 mm. The greater the field curvature value, the greater the deviation of the point on the imaging surface from the ideal surface. According to FIG. 27, the field curvature value of the lens assembly 100 in the camera module according to the embodiment of the present application is controlled within a very small range.

[0283] FIG. 28 is a distortion curve graph of the lens assembly 100 in the camera module according to the embodiment of the present application. The horizontal axis represents the distortion percentage, and the vertical axis represents the field height of 6.55 mm. Distortion does not affect the clarity of imaging, but can cause image deformation. According to FIG. 28, it is not difficult to see that the distortion of the lens assembly 100 according to the embodiment of the present application is controlled within a very small range (the distortion is less than 2%), and has less impact on imaging.

[0284] It should be understood that the lens assembly 100 in FIGS. 26-28 includes the lens group 101, the first prism 102, the second prism 103, and the entrance lens 104.

[0285] In addition, the structure shown in FIG. 29 is the actual state of the camera module when performing macro imaging.

[0286] FIG. 30 is a lateral chromatic aberration graph of the lens assembly 100 in the camera module according to the embodiment of the present application. The horizontal axis represents the lateral chromatic aberration value, and the vertical axis represents the normalized field of view. The lateral chromatic aberration in FIG. 14 represents the focal point position of light rays of different wavelengths on the imaging surface, wherein the wavelengths of the light rays can include 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm. The smaller the lateral chromatic aberration, the better the convergence effect of the light rays of the corresponding wavelength on the imaging surface. As can be seen from FIG. 30, the lateral chromatic aberration of the lens assembly 100 in the camera module according to the embodiment of the present application is controlled within a very small range.

[0287] FIG. 31 is a field curvature graph of the lens assembly 100 in the camera module according to the embodiment of the present application. The horizontal axis represents the field curvature value, and the vertical axis represents the field height of 6.55 mm. The greater the field curvature value, the greater the deviation of the point on the imaging surface from the ideal surface. According to FIG. 31, the field curvature value of the lens assembly 100 in the camera module according to the embodiment of the present application is controlled within a very small range.

[0288] FIG. 32 is an optical distortion curve corresponding to the lens assembly 100 in the camera module shown in FIG. 29, according to an embodiment of the present application. In FIG. 32, the horizontal axis represents the percentage of distortion, and the vertical axis represents the field height of 6.55 mm. Distortion does not affect the clarity of imaging, but can cause image deformation. As can be seen from FIG. 32, the distortion of the lens assembly 100 according to the embodiment of the present application is controlled within a very small range (the distortion is less than 2%), and has less impact on imaging.

[0289] It should be understood that the lens assembly 100 composed of the lens group 101, the first prism 102, the second prism 103, and the incident lens 104 in the embodiment of the present application also satisfies the relationship (4) to the relationship (10) in the foregoing embodiments, and the detailed content of the relationship (4) to the relationship (10) can be referred to the related description of the foregoing embodiments, which will not be described herein again.

[0290] It should be understood that based on this embodiment, S in the foregoing relationship (7) represents the optical path length from the light entrance surface of the incident lens 104 in the lens assembly 100 to the photosensitive chip 200.

[0291] In the camera module shown in FIG. 25 or FIG. 29, the lens assembly 100 is composed of the lens group 101, the first prism 102, the second prism 103, and the incident lens 104, wherein the focal length FL of the lens assembly 100 is 26 mm. The optical path length S from the light entrance surface of the incident lens 104 in the lens assembly 100 to the photosensitive chip 200 is 37 mm. The optical path length FBL from the light exit surface of the lens group 101 in the lens assembly 100 to the photosensitive chip 200 is 14.2 mm. The value of FBL / FL is 0.546154. The optical path length SP from the light entrance surface of the first prism 102 to the light exit surface of the first prism 102 is 13 mm. The imaging height IH is 6.25 mm. The height Hp of the first prism 102 is 7.7 mm.

[0292] Table 9 is a plurality of parameter values corresponding to the aforementioned respective camera modules. Specifically, the name column corresponds to the camera module shown in FIG. 3; the second corresponds to the camera module shown in FIG. 9; the third corresponds to the camera module shown in FIG. 17; the fourth corresponds to the camera module shown in FIG. 25 or FIG. 29. The plurality of parameters include: FL represents the focal length of the lens assembly 100; S represents the optical path length from the light entrance surface of the lens assembly 100 to the photosensitive chip 200; FBL represents the optical path length from the light exit surface of the lens assembly 100 to the photosensitive chip 200; FBL / FL represents the ratio between the optical path length from the light exit surface of the lens assembly 100 to the photosensitive chip 200 and the focal length of the lens assembly 100; SP represents the optical path length from the light entrance surface of the first prism 102 to the light exit surface of the first prism 102; IH represents the imaging height; Hp represents the height of the first prism 102. Among the parameters, the lens assembly 100 corresponds to the lens assembly 100 in the camera module in the foregoing embodiments.

[0293] Table 9

[0294] Table 9 (continued)

[0295] In the embodiments described in FIG. 25 and FIG. 29, the angle between the optical axis of the lens group 101 and the photosensitive chip 200 is also an acute angle. Taking the structure of the camera module shown in FIG. 25 as an example, the direction of the optical axis of the lens group 101 is E (i.e., the vertical direction), the direction of the imaging surface of the photosensitive chip 200 is F, and the acute angle between the optical axis of the lens group 101 and the photosensitive chip 200 is the angle formed after E and F intersect.

[0296] Based on the camera module provided in the foregoing embodiments of the present application, the angle between the optical axis of the lens group 101 and the photosensitive chip 200 is set to an acute angle, which can enable the photosensitive chip 200 to be obliquely arranged in the electronic device, and then use the first prism 102 to project the light entering the first prism 102 to the photosensitive chip 200 after at least two reflections. Such a design effectively eliminates the restriction of the size of the photosensitive chip 200 on the thickness of the periscope lens (including the lens group 101 and the first prism 102), reduces the thickness of the camera module close to the image side, and further reduces the thickness of the electronic device, which is conducive to the miniaturization development of the electronic device.

[0297] By optimizing a plurality of parameters, the camera module can have a longer back focal length, which facilitates the arrangement of a first prism 102 with a lower thickness between the lens group 101 and the photosensitive chip 200, so as to fold the light path more times, achieve a longer optical path, facilitate aberration correction, and obtain high-quality images. In this way, the thickness of the camera module can be further reduced without affecting the optical imaging performance of the camera module.

[0298] Finally, it should be noted that the above only describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A camera module, comprising: The lens assembly (100) comprises a lens group (101) and a first prism (102) located on the image side of the lens group (101), and the photosensitive chip (200) is located on the image side of the first prism (102). The first prism (102) comprises a first optical surface (1021), a second optical surface (1022) and a third optical surface (1023) which are not parallel to each other, the first optical surface (1021) is arranged opposite to the light exit surface of the lens group (101) as the light entrance surface of the first prism (102), the light rays entering the first prism (102) from the first optical surface (1021) produce at least two reflections in the first prism (102), and the third optical surface (1023) serves as the light exit surface of the first prism (102). The photosensitive chip (200) is arranged parallel to the third optical surface (1023), and the included angle between the photosensitive chip (200) and the optical axis of the lens group (101) is an acute angle. The camera module satisfies the following relationship: In the above relationship, FBL represents the optical path length from the light exit surface of the lens group (101) to the photosensitive chip (200); and FL represents the focal length of the lens assembly (100).

2. The camera module of claim 1, wherein, The first optical surface (1021), the second optical surface (1022) and the third optical surface (1023) are connected to each other in pairs. Wherein, the included angle between the first optical surface (1021) and the second optical surface (1022) is a first angle, the included angle between the first optical surface (1021) and the third optical surface (1023) is a second angle, the second optical surface (1022) serves as a first reflection surface, the first optical surface (1021) serves as a second reflection surface, the second angle is greater than the first angle, and the light rays entering the first prism (102) from the first optical surface (1021) are reflected from the third optical surface (1023) after being reflected by the first reflection surface and the second reflection surface in sequence; or, The included angle between the second optical surface (1022) and the third optical surface (1023) is a first angle, the included angle between the first optical surface (1021) and the third optical surface (1023) is a second angle, the third optical surface (1023) serves as a first reflection surface, the second optical surface (1022) serves as a second reflection surface, the second angle is greater than the first angle, and the light rays entering the first prism (102) from the first optical surface (1021) are reflected from the third optical surface (1023) after being reflected by the first reflection surface and the second reflection surface in sequence.

3. The camera module of claim 1, wherein, The first prism (102) further comprises a fourth optical surface (1024) opposite to the first optical surface (1021), the second optical surface (1022) is opposite to the third optical surface (1023), the first optical surface (1021), the third optical surface (1023), the fourth optical surface (1024) and the second optical surface (1022) are sequentially connected, the included angle between the first optical surface (1021) and the second optical surface (1022) is a first angle, and the included angle between the third optical surface (1023) and the fourth optical surface (1024) is a second angle; The second angle is greater than the first angle, the second optical surface (1022) serves as a first reflection surface, the first optical surface (1021) serves as a second reflection surface, and the fourth optical surface (1024) serves as a third reflection surface, and the light entering the first prism (102) from the first optical surface (1021) is reflected by the first reflection surface, the second reflection surface and the third reflection surface in sequence and then emitted from the third optical surface (1023) out of the first prism (102).

4. The camera module according to claim 2 or 3, characterized in that, The second angle is twice the first angle, and the first angle is less than 45°.

5. The camera module according to any one of claims 2 to 4, wherein, The camera module satisfies the following relationship: Np represents the refractive index of the first prism (102) in the relationship, and a represents the first angle.

6. The camera module according to any one of claims 2 to 5, wherein, The first angle ranges from 28° to 32°.

7. The camera module according to any one of claims 1 to 6, wherein, The lens assembly (100) comprises a second prism (103), the second prism (103) has an included angle between an entrance surface and an exit surface of the second prism (103), the lens group (101) is located on the image side of the second prism (103), and the entrance surface of the lens group (101) is opposite to the exit surface of the second prism (103).

8. The camera module of claim 7, wherein, The lens assembly (100) comprises an entrance lens (104) located on the object side of the second prism (103).

9. The camera module according to any one of claims 1 to 8, wherein, The lens group (101) comprises a first lens group, and the focal length of the first lens group is positive.

10. The camera module according to any one of claims 1 to 9, wherein, The refractive index of the first prism (102) is greater than 1.45; and / or, The Abbe number of the first prism (102) is greater than 18.

11. The camera module according to any one of claims 1 to 10, wherein, The lens assembly (100) satisfies the relationship: IH>3mm, wherein IH represents half of the diagonal length of the effective imaging area of the lens assembly (100).

12. The camera module according to any one of claims 1 to 11, wherein, The lens assembly (100) satisfies the relationship: Fno<5.0, wherein Fno represents the aperture value of the lens assembly (100).

13. The camera module of any one of claims 1-12, wherein, The lens assembly (100) satisfies the relationship: FOV<60°, wherein FOV represents the field of view angle of the lens assembly (100).

14. The camera module of any one of claims 1-13, wherein, The lens assembly (100) satisfies the relationship: S>0.9*FL, wherein S represents the optical path length from the entrance surface of the lens assembly (100) to the photosensitive chip (200), and FL represents the focal length of the lens assembly (100).

15. The camera module of any one of claims 1-14, wherein, The lens assembly (100) satisfies a relationship: SP>2*IH, wherein SP represents a light path length from an entrance surface of the first prism (102) to an exit surface of the first prism (102), and IH represents a half of a diagonal length of an effective imaging area of the lens assembly (100).

16. The camera module of any one of claims 1-15, wherein, The first prism (102) and the lens assembly (100) satisfy a relationship: Hp<1.8*IH, wherein Hp represents a height of the first prism (102), and IH represents a half of a diagonal length of an effective imaging area of the lens assembly (100).

17. The camera module of any one of claims 1-16, wherein, The first prism (102) comprises any one of a three-prism, a four-prism, a five-prism, and a six-prism.

18. An electronic device, comprising: The electronic device comprises a housing and a camera module as claimed in any one of claims 1 to 17 disposed within the housing.

Images