Camera module and electronic device

Abstract

This application relates to a camera module and an electronic device. The camera module includes: an image sensor; and a light guide prism, including at least two separately arranged sub-prisms, one of which faces the image sensor. The light guide prism is configured such that light incident on the sub-prism can be reflected sequentially by the at least two sub-prisms and then exit from the sub-prism facing the image sensor onto the image sensor. At least one of the opposing surfaces of the at least two sub-prisms is a curved surface. This camera module helps to reduce or eliminate the need for lenses in the camera module, thus compressing its size and meeting the requirements for thinner electronic devices.

Description

Technical Field

[0001] This application relates to the field of camera technology, and in particular to a camera module and electronic device. Background Technology

[0002] With the rapid development of electronic devices such as smartphones, tablets, and e-readers, the demands on camera module performance are increasing. To achieve good image quality for distant scenes, some electronic devices incorporate telephoto modules. To reduce the size of telephoto modules in the thickness direction of the electronic device, some telephoto modules employ a periscope design, which uses prisms to reflect light, shifting part of the light path from the thickness direction to the length and width plane. However, as camera performance requirements increase, the size of periscope camera modules in the thickness direction of electronic devices is also gradually increasing, making it difficult to meet the requirements of thinner electronic device designs. Summary of the Invention

[0003] This application provides a camera module and an electronic device to solve the problem that the increased size of the camera module in the thickness direction of the electronic device makes it difficult to meet the requirements of the thin design of the electronic device.

[0004] A camera module, comprising:

[0005] Image sensor; and,

[0006] A light guide prism includes at least two separately arranged sub-prisms, one of which is opposite to the image sensor. The light guide prism is configured such that light incident on the sub-prism can be reflected sequentially by the at least two sub-prisms and then exit from the sub-prism opposite to the image sensor onto the image sensor. At least one of the two opposing surfaces of the at least two sub-prisms is a curved surface.

[0007] An electronic device including a camera module as described above.

[0008] The aforementioned camera module features at least one of the opposing surfaces of at least two sub-prisms as a curved surface. This allows the light guide prism to not only transmit light through reflection but also participate in light adjustment, thus reducing the adjustment burden on the lenses and consequently reducing or eliminating the need for lenses in the camera module. This helps to compress the size of the camera module and, when applied to electronic devices, meets the requirements for thinner designs. Furthermore, dividing the light guide prism into at least two sub-prisms and placing the curved surface between them ensures that the curved surface does not occupy additional space beyond the light guide prism, further reducing the overall space required by the camera module. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of an electronic device in some embodiments.

[0011] Figure 2 This is a schematic diagram of the camera module in some embodiments.

[0012] Figure 3 This is a schematic diagram of the light guide prism in some embodiments.

[0013] Figure 4 The diagram shows the structure of the first and second sub-prisms, including the prism body and the lens structure, in some embodiments.

[0014] Figure 5 This is a schematic diagram of the light guide prism in some other embodiments.

[0015] Figure 6 This is a schematic diagram of the camera module in some other embodiments.

[0016] Figure 7 This is a schematic diagram of a structure in some embodiments where a light-shielding layer is disposed on the second light-emitting surface.

[0017] Figure 8 This is a schematic diagram of the camera module in some other embodiments.

[0018] Figure 9 This is a schematic diagram of the camera module in some embodiments.

[0019] Figure 10 This is a schematic diagram of the camera module in the first embodiment.

[0020] Figure 11 This is a graph showing the spherical aberration, astigmatism, and distortion curves of the camera module in the first embodiment.

[0021] Figure 12 This is a schematic diagram of the camera module in the second embodiment.

[0022] Figure 13 This is a graph showing the spherical aberration, astigmatism, and distortion curves of the camera module in the second embodiment.

[0023] Figure 14 This is a schematic diagram of the camera module in the third embodiment.

[0024] Figure 15 This is a graph showing the spherical aberration, astigmatism, and distortion curves of the camera module in the third embodiment.

[0025] Figure 16 This is a schematic diagram of the camera module in the fourth embodiment.

[0026] Figure 17 This is a graph showing the spherical aberration, astigmatism, and distortion curves of the camera module in the fourth embodiment.

[0027] Figure 18 This is a schematic diagram of the structure of other components of the electronic device in some embodiments.

[0028] Figure label:

[0029] 10. Electronic device; 11. Mid-frame; 12. Back panel; 121. Light passage hole; 20. Camera module; 21. Light guide prism; 211. First sub-prism; 2111. First light-incident surface; 2112. First light-exiting surface; 2113. First reflecting surface; 2114. First plane; 212. Second sub-prism; 2121. Second light-incident surface; 2122. Second light-exiting surface; 2123. Second reflecting surface; 2124. Second plane; 213. Third sub-prism; 2131. Third light-incident surface; 2132. Third light-emitting surface; 2133, Third reflecting surface; 2134, Third plane; 214, First reflection position; 215, Second reflection position; 216, Third reflection position; 217, Fourth reflection position; 218, Fifth reflection position; 219, Sixth reflection position; 221, Seventh reflection position; 23, Image sensor; 24, Lens; 241, Lens; L1, First lens; L2, Second lens; 25, Light-shielding layer; 26, Focusing drive mechanism; 27, Image stabilization drive mechanism; 28, Filter. Detailed Implementation

[0030] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0031] As used herein, "electronic device" refers to, but is not limited to, a device capable of receiving and / or transmitting communication signals connected via any one or more of the following connection methods:

[0032] (1) Via wired connection, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, or direct cable connection;

[0033] (2) Via wireless interface, such as cellular network, wireless local area network (WLAN), digital television network such as DVB-H network, satellite network, AM-FM broadcast transmitter.

[0034] An electronic device configured to communicate via a wireless interface can be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:

[0035] (1) Satellite phone or cellular phone;

[0036] (2) A personal communications system (PCS) terminal that can combine cellular radio telephone with data processing, fax and data communication capabilities;

[0037] (3) Radio telephone, pager, Internet / intranet access, web browser, notepad, calendar, personal digital assistant (PDA) equipped with a Global Positioning System (GPS) receiver;

[0038] (4) Conventional above-knee and / or palm-sized receivers;

[0039] (5) Conventional knee-mounted and / or handheld wireless telephone transceivers, etc.

[0040] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the electronic device 10 in some embodiments. Figure 2This is a schematic diagram of the camera module 20 in some embodiments. The electronic device 10 provided in this application includes, but is not limited to, mobile terminals such as smartphones, tablets, and e-readers. In various embodiments of this application, a smartphone is used as an example. The camera module 20 can be applied in the electronic device 10. The camera module 20 includes a light guide prism 21 and an image sensor 23. The light guide prism 21 is used to guide the light incident on the camera module 20 to the image sensor 23. The image sensor 23 can be electrically connected to the central processing unit of the electronic device 10, or electrically connected to a chip in the electronic device 10 specifically used to receive image information. The image sensor 23 can convert light signals into electrical signals for output, so that the electronic device 10 has a camera function.

[0041] In some embodiments, the electronic device 10 includes a mid-frame 11, a back panel 12, and a display panel (not shown). The back panel 12 and the display panel are located on opposite sides of the mid-frame 11, forming a receiving space together with the mid-frame 11. The camera module 20 is housed within the receiving space and receives external light through a light-transmitting hole 121 provided on the back panel 12. In the embodiments shown in the accompanying drawings, the camera module 20 is used to receive light from the side where the back panel 12 is located, and the camera module 20 serves as a rear camera of the electronic device 10. In other embodiments, the camera module 20 can also be used to receive light from the side of the display panel, in which case the camera module 20 serves as a front camera of the electronic device 10. Of course, the application of the camera module 20 is not limited to the electronic device 10 described in this application. The camera module 20 can also be used in any other applicable fields and products, as long as it can achieve the camera function.

[0042] In some embodiments, the light guide prism 21 includes at least two separately arranged sub-prisms, one of which is opposite to the image sensor 23. The light guide prism 21 is configured such that light incident on one of the sub-prisms can be reflected sequentially by the at least two sub-prisms and then exit from the sub-prism opposite to the image sensor 23 onto the image sensor 23. At least one of the two opposing surfaces of the at least two sub-prisms is a curved surface.

[0043] In this application, the surface of a sub-prism is described as a curved surface, which can be understood as the radius of curvature of the surface being non-zero at all points. The curved surface has an arc, and at least a portion of the curved surface may be convex or concave. At least a portion of the curved surface has the effect of converging or diverging light, and can participate in the light adjustment of the camera module 20. The type of the curved surface includes, but is not limited to, a spherical surface, an aspherical surface, or a freeform surface.

[0044] The aforementioned camera module 20 has at least one of the opposing surfaces of at least two sub-prisms set as a curved surface. This allows the light guide prism 21 to not only transmit light through reflection but also participate in light adjustment, which helps to share the adjustment burden of the lens 241. This reduces or eliminates the lens 241 in the camera module 20, thus compressing its size and meeting the thinning requirements of the electronic device 10. Furthermore, dividing the light guide prism 21 into at least two sub-prisms and placing the curved surface between them ensures that the curved surface does not occupy additional space beyond the light guide prism 21, further reducing the space occupied by the camera module 20.

[0045] Further, in some embodiments, the light guide prism 21 includes three sub-prisms: a first sub-prism 211, a second sub-prism 212, and a third sub-prism 213. The first sub-prism 211 has an intersecting first light-incident surface 2111 and a first light-exiting surface 2112; the second sub-prism 212 has an intersecting second light-incident surface 2121 and a second light-exiting surface 2122; and the third sub-prism 213 has an intersecting third light-incident surface 2131 and a third light-exiting surface 2132. The first light-exiting surface 2112 and the second light-incident surface 2121 are opposite each other, the second light-exiting surface 2122 is opposite to the third light-incident surface 2131, and the third light-exiting surface 2132 is opposite to the image sensor 23. The first light-incident surface 2111 is used to allow light to enter the light guide prism 21. For example, when the camera module 20 is installed in the electronic device 10, the first light-incident surface 2111 is opposite to the light-transmitting aperture 121. The first light-incident surface 2111 and the third light-exit surface 2132 are parallel and face the same side. External light can enter the first sub-prism 211 through the first light-incident surface 2111, undergo at least one reflection in the first sub-prism 211, exit the first sub-prism 211 through the first light-exit surface 2112, then enter the second sub-prism 212 through the second light-incident surface 2121, undergo at least one reflection in the second sub-prism 212, exit the second sub-prism 212 through the second light-exit surface 2122, then enter the third sub-prism 213 through the third light-incident surface 2131, undergo at least one reflection in the third sub-prism 2132, and exit the third light-exit surface 2132, ultimately striking the image sensor 23. At least one of the first light-exit surface 2112, the second light-incident surface 2121, the second light-exit surface 2122, and the third light-incident surface 2131 is a curved surface.

[0046] It should be noted that, in this application, describing two intersecting surfaces can mean that the two surfaces are connected and intersecting, or that the extended surfaces of the two surfaces intersect, that is, the planes containing the two surfaces form an angle. In this application, describing the planes containing two surfaces intersecting, if at least one of the two surfaces is a curved surface, can be understood as the plane corresponding to the line connecting the two ends of the cross-section of the curved surface intersecting the other surface.

[0047] By configuring the light path of the light guide prism 21, the first light-incident surface 2111 for receiving light and the third light-exiting surface 2132 for emitting light are parallel and face the same side. When the camera module 20 is installed in the electronic device 10, the first light-incident surface 2111 and the third light-exiting surface 2132 are perpendicular to the thickness direction of the electronic device 10. With this configuration, the light guide prism 21 can not only deflect part of the light path to the length and width plane of the electronic device 10 through reflection, but also make the incident light path and the emitted light path overlap in the thickness direction of the electronic device 10, thereby helping to reduce the size of the camera module 20 in the thickness direction of the electronic device 10. In addition, when the camera module 20 is equipped with a lens 24, the lens 24 is located on one side of the first light-incident surface 2111 of the light guide prism 21 and opposite to the first light-incident surface 2111. The lens 24 is located between the light-transmitting hole 121 and the first light-incident surface 2111, and the axial dimension of the lens 24 occupies the dimension in the thickness direction of the electronic device 10. The camera module 20 provided in the above embodiments of this application, by setting a curved surface on the light guide prism 21, can share the burden of deflecting light from the lens 24, thereby reducing the number of lenses 241 with optical power in the lens 24, that is, reducing the axial dimension of the lens 24, and thus reducing the size of the camera module 20 in the thickness direction of the electronic device 10, which is beneficial to the thinner and lighter design of the electronic device 10. In addition, by Figure 2 As can be seen, since the first light-incident surface 2111 and the third light-outceasing surface 2132 face the same side, when the camera module 20 is equipped with a lens 24, the lens 24 can be set to at least partially overlap with the image sensor 23 in the axial direction, which is also beneficial to compress the space occupied by the camera module 20 as a whole in the thickness direction of the electronic device 10.

[0048] Furthermore, in some embodiments, the first sub-prism 211 has a first reflecting surface 2113 intersecting the first light-incident surface 2111 and the first light-outcrystal surface 2112, the second sub-prism 212 has a second reflecting surface 2123 intersecting the second light-incident surface 2121 and the second light-outcrystal surface 2122, and the third sub-prism 213 has a third reflecting surface 2133 intersecting the third light-incident surface 2131 and the third light-outcrystal surface 2132. The light guide prism 21 is configured such that light rays incident on the first sub-prism 211 from the first light-incident surface 2111 can be reflected sequentially by the first reflecting surface 2113 and the first light-incident surface 2111 and then exit from the first light-exiting surface 2112; light rays incident on the second sub-prism 212 from the second light-incident surface 2121 can be reflected sequentially by the second reflecting surface 2123 and then exit from the second light-exiting surface 2122; and light rays incident on the third sub-prism 213 from the third light-incident surface 2131 can be reflected sequentially by the third light-exiting surface 2132 and the third reflecting surface 2133 and then exit from the third light-exiting surface 2132.

[0049] Therefore, light can be reflected five times in the light guide prism 21 before exiting, effectively extending the optical path of the light in the light guide prism 21, thus adapting to the telephoto design of the camera module 20. In this application, through the design of the light guide prism 21, the camera module 20 can adopt a telephoto design, enabling the camera module 20 to have good long-distance shooting performance. The focal length of the camera module 20 is not limited, and the number of reflections and the transmission path of light in the light guide prism 21 can also be set by other applicable methods, which can be adjusted according to the focal length of the camera module 20.

[0050] In some embodiments, the light guide prism 21 is configured such that the incident angle of light on the first incident surface 2111, the second reflecting surface 2123, and the third emitting surface 2132 is greater than the critical angle for total internal reflection, so that the light undergoes total internal reflection on the first incident surface 2111, the second reflecting surface 2123, and the third emitting surface 2132. This partial total internal reflection configuration is beneficial for improving the reflectivity of light and the light utilization efficiency of the camera module 20, thereby improving the imaging quality of the camera module 20. In some embodiments, the camera module 20 further includes a reflective film (not shown) disposed on the first reflecting surface 2113 and the third reflecting surface 2133, the reflective film being used to reflect light incident on the first reflecting surface 2113 and the third reflecting surface 2133. The reflective film includes, but is not limited to, a metal film or a dielectric film with a reflectivity greater than or equal to 90%. The reflective film is set to improve the reflectivity of light on the first reflective surface 2113 and the third reflective surface 2133, which also helps to improve the light utilization efficiency of the camera module 20, thereby improving the imaging quality.

[0051] In some embodiments, the shape and refractive index of the light guide prism 21 can be designed to achieve total internal reflection on the first incident surface 2111, the second reflecting surface 2123, and the third emitting surface 2132. For example, in some embodiments, the angle between the first incident surface 2111 and the first reflecting surface 2113, and the angle between the third reflecting surface 2133 and the third emitting surface 2132 are 25°-45°, specifically 25°, 30°, 35°, or 45°. The refractive indices of the first sub-prism 211, the second sub-prism 212, and the third sub-prism 213 are not limited, and the refractive indices of the first sub-prism 211, the second sub-prism 212, and the third sub-prism 213 can be equal or unequal, as long as they can be combined with the angle design of each surface to achieve total internal reflection. This application does not impose any limitations on this.

[0052] In some embodiments, the second sub-prism 212 further has a second plane 2124 opposite to the second reflective surface 2123. The first light-incident surface 2111, the second plane 2124, and the third light-outcrystal surface 2132 are coplanar. The second reflective surface 2123 is parallel to the first light-incident surface 2111. This is beneficial for optimizing the structural configuration of the light guide prism 21, and for facilitating the assembly and support of the light guide prism 21 in the camera module 20 and the electronic device 10, thereby improving the structural reliability of the camera module 20.

[0053] In this application, the lens 24 of the camera module 20 can be omitted. When the camera module 20 is provided with a lens 24, the number of lenses 241 with optical power in the lens 24 is also not limited. The number of curved surfaces and the specific settings of the curved surfaces in the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122 and the third light-incident surface 2131 are also not limited. They can be designed according to the camera requirements of the camera module 20.

[0054] In some embodiments, the camera module 20 is provided with a lens 24, which is disposed on one side of the first light-incident surface 2111 and opposite to the first light-incident surface 2111. The number of lenses 241 with optical power in the lens 24 is less than or equal to 3. In various embodiments of this application, the number of lenses 241 with optical power in the lens 24 is taken as an example. This configuration, combined with the curved design of the light guide prism 21, helps to reduce the number of lenses 241 in the lens 24, thereby compressing the axial dimension of the lens 24 and the thickness of the camera module 20 in the electronic device 10, so as to meet the requirements of the thin and light design of the electronic device 10.

[0055] In some embodiments, the number of lenses 241 with optical power in the lens 24 is 2 or 3, and the surface types of the curved surfaces in the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122, and the third light-incident surface 2131 are spherical or aspherical. This configuration, while compressing the axial dimension of the lens 24 to compress the thickness dimension of the camera module 20 in the electronic device 10, does not result in a small number of lenses 241 with optical power in the lens 24. This allows the lens 24 to bear the main light deflection role in the camera module 20, reducing the deflection role borne by the curved surfaces in the light guide prism 21. Therefore, even when the curved surface type in the light guide prism 21 is spherical or aspherical, it will not introduce excessive asymmetric aberrations, thus helping to ensure the imaging quality of the camera module 20. Furthermore, it eliminates the need for the curved surfaces in the light guide prism 21 to be free-form surfaces, reducing the design and fabrication difficulty of the light guide prism 21 and lowering the manufacturing cost of the camera module 20.

[0056] refer to Figure 2 and Figure 3 As shown, in Figure 3 In the diagram, dashed lines indicate the lines connecting the two ends of the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122, and the third light-emitting surface 2132 on the cross-section of the light guide prism 21 when these surfaces are curved. In some embodiments, the first light-emitting surface 2112 is curved, and the line connecting the two ends of the first light-emitting surface 2112 is perpendicular to the first reflecting surface 2113 on the cross-section of the first sub-prism 211. With this configuration, when light enters the first sub-prism 211 from the first light-incident surface 2111, it is perpendicularly incident. After the light undergoes two reflections in the first sub-prism 211 and exits, the geometric relationship of the light path of the principal ray of the central field of view indicates that when the light exits from the second light-exit surface 2122, the principal ray of the central field of view is perpendicularly incident on the second light-exit surface 2122, that is, perpendicular to the tangent plane of the incident position of the principal ray of the central field of view. This allows the first light-exit surface 2112 to effectively participate in the adjustment of light, reduce the asymmetric aberrations introduced by the first light-exit surface 2112, and improve the imaging quality of the camera module 20.

[0057] In some embodiments, the third incident surface 2131 is a curved surface, and the line connecting the two ends of the third incident surface 2131 is perpendicular to the third reflecting surface 2133 on the cross-section of the third sub-prism 213. When the principal ray of the central field of view undergoes two reflections within the third sub-prism 213 and exits from the third exit surface 2132 with perpendicular incidence, it can be seen from the geometric relationship of the light path of the principal ray of the central field of view in the third sub-prism 213 that when the principal ray of the central field of view enters the third sub-prism 213 from the third incident surface 2131, it is also perpendicularly incident on the third incident surface 2131. This is beneficial to improving the light adjustment effect of the third incident surface 2131 and reducing the aspherical aberration introduced by the third incident surface 2131, thereby improving the imaging quality of the camera module 20.

[0058] In some embodiments, both the second light-incident surface 2121 and the second light-exiting surface 2122 are curved surfaces. On the cross-section of the light guide prism 21, the line connecting the two ends of the first light-exiting surface 2112 is parallel to the line connecting the two ends of the second light-incident surface 2121, and the line connecting the two ends of the second light-exiting surface 2122 is parallel to the line connecting the two ends of the third light-incident surface 2131. Therefore, when the principal ray of the central field of view is perpendicularly incident on the first light-exiting surface 2112 and the third light-incident surface 2131, the principal ray of the central field of view is also simultaneously perpendicularly incident on the second light-incident surface 2121 and the second light-exiting surface 2122. This improves the light-adjusting effect of the second light-incident surface 2121 and the second light-exiting surface 2122, reduces the asymmetric aberrations introduced by the second light-incident surface 2121 and the second light-exiting surface 2122, and improves the imaging quality of the camera module 20. Thus, the camera module 20 can achieve both miniaturization and good imaging quality.

[0059] In some embodiments, one of the first light-emitting surface 2112 and the second light-incident surface 2121 is a convex surface and the other is a concave surface; similarly, one of the second light-emitting surface 2122 and the third light-incident surface 2131 is a convex surface and the other is a concave surface. This configuration, where one of the two opposing curved surfaces in the light guide prism 21 is convex and the other is concave, not only participates in light regulation but also improves the structural compactness of the light guide prism 21. This helps to reduce the overall space occupied by the light guide prism 21, and similarly, it helps to reduce the size of the camera module 20, thus facilitating the miniaturization design of the electronic device 10.

[0060] exist Figure 3 In the illustrated embodiment, the first sub-prism 211, the second sub-prism 212, and the third sub-prism 213 are all integral structures. When the first sub-prism 211, the second sub-prism 212, and the third sub-prism 213 are provided with curved surfaces, the curved surfaces are formed on the surfaces of the first sub-prism 211, the second sub-prism 212, and the third sub-prism 213. (Reference) Figure 4As shown, in some embodiments, when the first sub-prism 211 has a convex curved surface, the first sub-prism 211 may include a prism body and a lens structure. The lens structure is relatively independent of the prism body and is relatively fixedly disposed on the side of the prism body facing the second sub-prism 212. The side of the lens structure facing the prism body is flat, and the first light-emitting surface 2112, which is curved, is disposed on the side of the lens structure facing away from the prism body. This arrangement allows the curved surface to be disposed on a lens structure that is relatively independent of the prism body. For example, a lens structure with a curved surface can be disposed independently, and then the lens structure can be fixed to the prism body, which helps to reduce the difficulty of setting the curved surface. Of course, when the second sub-prism 212 has a convex curved surface, the second sub-prism 212 may also include a relatively independent prism body and a lens structure. The lens structure is disposed on the side of the prism body facing the first sub-prism 211 or facing the third sub-prism 213, and the curved surface is disposed on the side of the lens structure facing away from the prism body. When the third sub-prism 213 has a convex curved surface, the third sub-prism 213 may also include a prism body and a lens structure. The lens structure is located on the side of the prism body facing the second sub-prism 212, and the curved surface is located on the side of the lens structure facing away from the third sub-prism 213.

[0061] In various embodiments of this application, the lens 24 includes two lenses 241 with optical power, the first light-emitting surface 2112 being convex, the second light-incident surface 2121 being concave, the second light-emitting surface 2122 being convex, and the third light-incident surface 2131 being concave, as an example. In some embodiments, the light guide prism 21 is made of glass, and the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122, and the third light-incident surface 2131 can be manufactured by molding and grinding. In other embodiments, one or more of the first sub-prism 211, the second sub-prism 212, and the third sub-prism 213 can also be made of plastic by injection molding. It is understood that the number of lenses 241 with optical power in the lens 24, the optical power and surface shape of each lens 241, and the surface shape settings of the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122, and the third light-incident surface 2131 are not limited to those described in the embodiments of this application, and can be designed according to the light adjustment requirements of the camera module 20. For example, only one, two, or all three of the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122, and the third light-incident surface 2131 may be curved surfaces, and the surface shape of each curved surface may be any combination of convex and concave surfaces.

[0062] In some embodiments, the camera module 20 does not have a lens 24; instead, light is adjusted only by the curved surface in the light guide prism 21. This effectively reduces the size of the camera module 20 in the thickness direction of the electronic device 10, thus facilitating the thinner and lighter design of the electronic device 10, as long as the light adjustment requirements of the camera module 20 are met. In some embodiments, the lens 24 has one lens 241 with optical power, and the material of the lens 241 includes, but is not limited to, glass or plastic. In some embodiments, the camera module 20 has two lenses 241, both of which can be made of plastic, or one lens 241 can be made of glass and the other of plastic. In some embodiments, the surface of the glass lens 241 in the lens 24 can be a ground spherical surface or a molded aspherical surface.

[0063] refer to Figure 5 As shown, in some embodiments, the first sub-prism 211 has a first plane 2114 facing away from the first light-incident surface 2111, the second sub-prism 212 has a second plane 2124 facing away from the second reflecting surface 2123, and the third sub-prism 213 has a third plane 2134 facing away from the third light-exiting surface 2132. The first light-incident surface 2111, the second plane 2124, and the third light-exiting surface 2132 can be parallel to each other, for example, the first light-incident surface 2111, the second plane 2124, and the third light-exiting surface 2132 can be coplanar. The first plane 2114, the second reflecting surface 2123, and the third plane 2134 can be parallel to each other, for example, coplanar. The principal ray of the central field of view of the light guide prism 21 is incident from the first light-incident surface 2111. Figure 5 The light rays shown (a) can be reflected sequentially by the first reflecting surface 2113, the first light-emitting surface 2112, the second reflecting surface 2123, the third light-emitting surface 2132 and the third reflecting surface 2133, and then emitted from the third light-emitting surface 2132.

[0064] Figure 5The diagram also illustrates the optical paths of two principal rays from the edge field of view that enter the light guide prism 21 from the first light-incident surface 2111. The two principal rays from the edge field of view are ray b and ray c, respectively. On the cross-section of the light guide prism 21, ray b and ray c are located on opposite sides of the principal ray a in the central field of view. Specifically, after the principal ray b from the edge field of view enters the light guide prism 21 from the first light-incident surface 2111, it is reflected sequentially by the first reflecting surface 2113, the first light-incident surface 2111, the first plane 2114, the second plane 2124, and the third reflecting surface 2133, and then exits the light guide prism 21 from the third light-exiting surface 2132. The principal ray c of the edge field of view enters the light guide prism 21 from the first light-incident surface 2111, and after being reflected by the first reflective surface 2113, the second plane 2124, the third plane 2134, the third light-exiting surface 2132 and the third reflective surface 2133 in sequence, it exits the light guide prism 21 from the third light-exiting surface 2132.

[0065] It should be noted that, in this application, the central field of view of the camera module 20 is defined as the range of the field of view angles around the optical axis of the camera module 20, ±θ1, where θ1 is 40% of the total field of view (FOV), and the incident angle of the principal ray of the central field of view is less than 15°. The central field of view corresponds to a range where the image height is less than or equal to 30% of the diagonal length of the image sensor 23. The edge field of view of the camera module 20 is defined as a range exceeding 60% of the total field of view, where the incident angle of the principal ray of the edge field of view exceeds 30°, and the corresponding image height is greater than 70% of the diagonal length of the image sensor 23. The principal ray of the central field of view refers to the ray that passes through the center of the aperture of the camera module 20 and finally reaches the image sensor 23 within the central field of view range, and the principal ray of the edge field of view refers to the ray that passes through the center of the aperture of the camera module 20 and finally reaches the image sensor 23 within the edge field of view range.

[0066] In some embodiments, the central field-of-view principal ray is reflected at a first reflection position 214 on the first incident surface 2111 and at a second reflection position 215 on the second reflection surface 2123. The edge field-of-view principal ray c is reflected at a third reflection position 216 on the second plane 2124, and the edge field-of-view principal ray b is reflected at a fourth reflection position 217 on the first plane 2114. Along the direction from the first reflection position 214 to the second reflection position 215 along the first incident surface 2111, both the third reflection position 216 and the fourth reflection position 217 are located between the first reflection position 214 and the second reflection position 215. The first emitting surface 2112 and the second incident surface 2121 are both located between the third reflection position 216 and the fourth reflection position 217. Therefore, the first light-emitting surface 2112 and the second light-incident surface 2121 are positioned between the reflection positions of the two main rays of the edge field of view, which can reduce the influence of the arrangement of the first light-emitting surface 2112 and the second light-incident surface 2121 on the reflection of the edge field of view rays. This helps to reduce stray light and aberrations introduced by the arrangement of the first light-emitting surface 2112 and the second light-incident surface 2121, and helps to improve the imaging quality of the camera module 20.

[0067] In some embodiments, the central field-of-view principal ray a is reflected at the fifth reflection position 218 on the third emitting surface 2132, the edge field-of-view principal ray c is reflected at the sixth reflection position 219 on the third plane 2134, and the edge field-of-view principal ray a is reflected at the seventh reflection position 221 on the second plane 2124. Along the direction from the second reflection position 215 to the fifth reflection position 218 along the third emitting surface 2132, both the sixth reflection position 219 and the seventh reflection position 221 are located between the second reflection position 215 and the fifth reflection position 218, and both the second emitting surface 2122 and the third incident surface 2131 are located between the second reflection position 215 and the fifth reflection position 218. Therefore, the second light-emitting surface 2122 and the third light-incident surface 2131 are also positioned between the reflection positions of the two peripheral field-of-view principal rays, which can reduce the influence of the second light-emitting surface 2122 and the third light-incident surface 2131 on the reflection of the peripheral field-of-view rays. This helps to reduce stray light and aberrations introduced by the second light-emitting surface 2122 and the third light-incident surface 2131, and helps to improve the imaging quality of the camera module 20.

[0068] Of course, the shape of the light guide prism 21 is not limited to Figure 5 The records, for example, refer to Figure 2As shown, in some embodiments, the first plane 2114 and the third plane 2134 can be omitted. The first light-emitting surface 2112, the first light-incident surface 2111, and the first reflective surface 2113 are connected. The third light-incident surface 2131 is connected to the third light-emitting surface 2132 and the third reflective surface 2133. Then, the reflection positions of the main rays of the edge field of view on each surface of the light guide prism 21 are also different. The positions of the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122, and the third light-incident surface 2131 can be adjusted according to the reflection position of the main rays of the edge field of view. As long as the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122, and the third light-incident surface 2131 are located between the reflection positions of the two main rays of the edge field of view, the influence of the curved surface on the imaging quality of the edge field of view can be reduced. This will not be elaborated in this application.

[0069] refer to Figure 6 As shown, in some embodiments, at least one of the first light-emitting surface 2112 and the second light-incident surface 2121 is a curved surface. Figure 6 In this example, both the first light-emitting surface 2112 and the second light-receiving surface 2121 are curved surfaces. The first light-emitting surface 2112 and the second light-receiving surface 2121 are spaced apart to provide sufficient space for light adjustment. The second light-emitting surface 2122 and the third light-receiving surface 2131 are planar and are bonded together. The camera module 20 also includes a light-shielding layer 25 located on one of the second light-emitting surface 2122 and the third light-receiving surface 2131. The light-shielding layer 25 is disposed around the light-transmitting area between the second light-emitting surface 2122 and the third light-receiving surface 2131. For example, the orthographic projection of the light-shielding layer 25 on the second light-emitting surface 2122 covers the edge contour of the second light-emitting surface 2122, and the orthographic projection of the light-shielding layer 25 on the third light-receiving surface 2131 covers the edge contour of the third light-receiving surface 2131. The light-shielding layer 25 includes, but is not limited to, a light-shielding medium layer or a light-shielding structure such as ink screen printing.

[0070] Combination Figure 7 As shown, Figure 7 A schematic diagram of the structure is shown in some embodiments when the light-shielding layer 25 is disposed on the second light-emitting surface 2122. It can be seen that the light-shielding layer 25 can absorb light outside the light-transmitting area, reducing stray light components in the light guide prism 21, thereby improving the imaging quality of the camera module 20. Simultaneously, integrating the light-shielding layer 25 between the second sub-prism 212 and the third sub-prism 213 of the light guide prism 21, with the light-shielding layer 25 located in the propagation path of the light path, provides a more direct and sufficient suppression effect on stray light, and does not easily increase the space occupied by the light guide prism 21, which is beneficial for balancing the miniaturization design of the camera module 20 with good imaging quality.

[0071] In other embodiments, at least one of the second light-emitting surface 2122 and the third light-incident surface 2131 is curved, the second light-emitting surface 2122 and the third light-incident surface 2131 are spaced apart, the first light-emitting surface 2112 and the second light-incident surface 2121 are planar, the first light-emitting surface 2112 and the second light-incident surface 2121 are bonded together, and a light-shielding layer 25 is disposed on one of the first light-emitting surface 2112 and the second light-incident surface 2121. The light-shielding layer 25 is disposed around the light-transmitting area between the first light-emitting surface 2112 and the second light-incident surface 2121. For example, the orthographic projection of the light-shielding layer 25 on the first light-emitting surface 2112 covers the edge contour of the first light-emitting surface 2112, and the orthographic projection of the light-shielding layer 25 on the second light-incident surface 2121 covers the edge contour of the second light-incident surface 2121. Thus, the arrangement of integrating the light-shielding layer 25 into the light guide prism 21 also helps to balance the good imaging quality and miniaturized design of the camera module 20.

[0072] Please see again. Figure 2 As shown, in some embodiments, the camera module 20 further includes a focusing drive mechanism 26 and an image stabilization drive mechanism 27. The focusing drive mechanism 26 includes, but is not limited to, a voice coil motor, and the image stabilization drive mechanism 27 includes, but is not limited to, an electromagnetic cantilever mechanism. When the camera module 20 is equipped with a lens 24, the focusing drive mechanism 26 is used to drive the lens 24 to move along the axial direction toward or away from the first light-incident surface 2111, so as to realize the optical focusing function or optical zoom function of the camera module 20. The image stabilization drive mechanism 27 is used to drive the image sensor 23 to move relative to the light guide prism 21 in two mutually perpendicular directions on a plane parallel to the third light-out surface 2132, so as to realize the optical image stabilization function of the camera module 20. Therefore, by setting the focusing drive mechanism 26 and the image stabilization drive mechanism 27 at the lens 24 and the image sensor 23 respectively, it is beneficial to reduce the risk of mutual interference between the focusing drive mechanism 26 and the image stabilization drive mechanism 27, thereby improving the performance stability and structural reliability of the camera module 20. At the same time, in conjunction with the optical path design of the light guide prism 21, it is also beneficial to make at least part of the dimensions of the focusing drive mechanism 26 and the image stabilization drive mechanism 27 coincide in the axial direction of the lens 24, which is beneficial to compressing the overall size of the camera module 20 in the thickness direction of the electronic device 10, thereby helping to meet the requirements of the thin and light design of the electronic device 10.

[0073] Of course, the focus drive mechanism 26 and the image stabilization drive mechanism 27 can also be configured in any other suitable way, as long as they can achieve the optical focusing and optical image stabilization functions of the camera module 20. For example, in some embodiments, the focus drive mechanism 26 and the image stabilization drive mechanism 27 can both be integrated into the lens 24, with the focus drive mechanism 26 driving the lens 24 to move along the axial direction and the image stabilization drive mechanism 27 driving the lens 24 to move in a plane perpendicular to the axial direction. In still other embodiments, when the lens 24 is omitted from the camera module 20, the focus drive mechanism 26 and the image stabilization drive mechanism 27 can both be integrated into the image sensor 23, with the focus drive mechanism 26 driving the image sensor 23 to move along the axial direction and the image stabilization drive mechanism 27 driving the image sensor 23 to move in a plane perpendicular to the axial direction.

[0074] refer to Figure 8 As shown, in some embodiments, at least one of the first light-emitting surface 2112 and the second light-incident surface 2121 is a curved surface. Figure 8 In this example, both the first light-emitting surface 2112 and the second light-incident surface 2121 are curved surfaces. The focusing drive mechanism 26 is used to drive the first sub-prism 211 to move towards or away from the second sub-prism 212, and under the drive of the focusing drive mechanism 26, the direction of movement of the first sub-prism 211 relative to the second sub-prism 212 is (…). Figure 8 The double arrows shown are perpendicular to the tangent plane at the center of the first light-emitting surface 2112 and the second light-incident surface 2121, that is, perpendicular to the cross-section of the light guide prism 21, and the line connecting the two ends of the first light-emitting surface 2112 and the second light-incident surface 2121. Thus, by providing a curved surface in the light guide prism 21, it becomes possible to achieve optical focusing by driving a portion of the light guide prism 21 (e.g., the first sub-prism 211) to move in a direction inclined to the axis of the lens 24. By achieving optical focusing of the camera module 20 through the movement of the first sub-prism 211 in a direction inclined to the axis of the lens 24, a portion of the focusing travel in the thickness direction of the electronic device 10 can be converted into a travel component perpendicular to the thickness direction of the electronic device 10. This helps to reduce the space occupied by the focusing travel in the thickness direction of the electronic device 10, further compressing the space occupied by the camera module 20 in the thickness direction of the electronic device 10, and meeting the requirements for a thinner and lighter design of the electronic device 10.

[0075] It is understandable that when the camera module 20 is equipped with a lens 24, the focusing drive mechanism 26 can be used to drive the lens 24 and the first sub-prism 211 to move synchronously relative to the second sub-prism 212 in a direction inclined to the axis of the lens 24 to achieve the optical focusing function of the camera module 20. For example, the first sub-prism 211 and the lens 24 are set on the same carrier, and the focusing drive mechanism 26, such as the voice coil motor, drives the carrier of the first sub-prism 211 and the lens 24 to move, which is beneficial to maintaining good image quality during the focusing process.

[0076] refer to Figure 9 As shown, in some other embodiments, at least one of the second light-emitting surface 2122 and the third light-incident surface 2131 is a curved surface, for example, both the second light-emitting surface 2122 and the third light-incident surface 2131 are curved surfaces. The focusing drive mechanism 26 is used to drive the third sub-prism 213 to move toward or away from the second sub-prism 212, and under the drive of the focusing drive mechanism 26, the moving direction of the third sub-prism 213 relative to the second sub-prism 212 is ( Figure 9 The double arrows shown are perpendicular to the tangent plane at the center of the second light-emitting surface 2122 and the third light-incident surface 2131, that is, perpendicular to the line connecting the two ends of the second light-emitting surface 2122 and the third light-incident surface 2131 in the cross-section of the light guide prism 21. This arrangement, combined with the curved surface design in the light guide prism 21, enables the camera module 20 to perform optical focusing by moving the third sub-prism 213 along the axis inclined to the lens 24. This converts a portion of the focusing travel in the thickness direction of the electronic device 10 into a travel component perpendicular to the thickness direction of the electronic device 10, thereby reducing the space occupied by the focusing travel in the thickness direction of the electronic device 10, compressing the space occupied by the camera module 20 in the thickness direction of the electronic device 10, and meeting the requirements for a thinner and lighter design of the electronic device 10.

[0077] Similarly, when the focusing drive mechanism 26 is used to drive the third sub-prism 213 to move, the focusing drive mechanism 26 can be used to drive the third sub-prism 213 and the image sensor 23 to move synchronously relative to the second sub-prism 212. For example, the third sub-prism 213 and the image sensor 23 are mounted on the same carrier. The focusing drive mechanism 26, such as the voice coil motor, drives the third sub-prism 213 and the image sensor 23 to move synchronously, so as to maintain good imaging quality during the focusing process.

[0078] refer to Figure 2As shown, in some embodiments, the camera module 20 further includes a filter 28 located between the third light-emitting surface 2132 and the image sensor 23. The filter 28 includes, but is not limited to, an infrared cut-off filter. The filter 28 is used to filter out interference light and prevent interference light from hitting the image sensor 23 and affecting the imaging quality of the camera module 20. The electronic device 10 and the camera module 20 may also include any other suitable elements to achieve the corresponding functions, which are not limited in this application.

[0079] In some embodiments, the camera module 20 further includes a base, which serves as a supporting structure for the various components within the camera module 20. A light guide prism 21 is disposed on the base, with its first light-incident surface 2111, second plane 2124, and third light-outceasing surface 2132 exposed above the base. A focusing drive mechanism 26 is disposed on the base, with a lens 24 movably disposed within the focusing drive mechanism 26 and facing the first sub-prism 211. An image stabilization drive mechanism 27 is disposed on the base, with an image sensor 23 movably disposed on the image stabilization drive mechanism 27 and facing the third sub-prism 213. A filter 28 is disposed on the image stabilization drive mechanism 27 and located between the third sub-prism 213 and the image sensor 23. Thus, while ensuring smooth light propagation, the base integrates all components of the camera module 20 into a single unit, which improves the assembly accuracy and reliability between components and ultimately enhances image quality.

[0080] In some embodiments, cross-sections may be provided between the first light-incident surface 2111 and the first reflective surface 2113, and between the third light-exiting surface 2132 and the third reflective surface 2133. These cross-sections may be parallel to the axis of the lens 24. Providing cross-sections at the two outermost points of the camera module 20 helps reduce the length of the camera module 20 and also helps avoid the risk of sharp corners being damaged by impact, thus improving the structural reliability of the light guide prism 21. In some embodiments, anti-reflective coatings may be provided on the first light-incident surface 2111 and the third light-exiting surface 2132 to improve light transmittance and enhance the imaging quality of the camera module 20. In some embodiments, a light-shielding structure such as ink may be provided on the second plane 2124 to block and absorb stray light, thereby improving the imaging quality of the camera module 20. In some embodiments, light-shielding structures such as screen printing are provided on other areas outside the effective imaging area of ​​the first reflective surface 2113, the third reflective surface 2133, the first light-incident surface 2111, the second plane 2124, the third light-out surface 2132, and the second reflective surface 2123, so as to reduce stray light components in the camera module 20 and improve the imaging quality of the camera module 20.

[0081] The following provides a schematic diagram of the curved surface arrangement of the lens 24 and the light guide prism 21 of the camera module 20 in some embodiments.

[0082] refer to Figure 10As shown, in some embodiments, the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122, and the third light-incident surface 2131 are all curved surfaces, and all are spherical surfaces. The number of lenses 241 with optical power in the lens 24 is greater than or equal to 2. By setting the curved surface in the light guide prism 21 to a spherical surface, it is beneficial to reduce the difficulty and cost of setting the light guide prism 21. At the same time, the lens 24 has a number of lenses 241 greater than or equal to 2, which, in combination with the curved surface in the light guide prism 21, can improve the imaging quality of the camera module 20.

[0083] Furthermore, in some embodiments, in the direction from the lens 24 to the first light-incident surface 2111 along the axial direction of the lens 24, the lens 24 includes a first lens L1 and a second lens L2 arranged sequentially. The object-side and image-side surfaces of the first lens L1, the object-side and image-side surfaces of the second lens L2, the first light-exiting surface 2112, the second light-incident surface 2121, the second light-exiting surface 2122, and the third light-incident surface 2131 are all curved surfaces, and the object-side and image-side surfaces of the second lens L2 are both aspherical. With this arrangement, the first lens L1 and the second lens L2 cooperate with the curved surfaces in the light guide prism 21, and the aspherical arrangement of the object-side and image-side surfaces of the second lens L2 can effectively improve the imaging quality of the camera module 20. At the same time, it eliminates the need for aspherical surfaces in the light guide prism 21, which helps to reduce the manufacturing difficulty and cost of the light guide prism 21.

[0084] In some embodiments, the first lens L1 has positive optical power, the second lens L2 has negative optical power, the object-side surface of the first lens L1 is convex, the object-side surface of the second lens L2 is convex near the optical axis, and the image-side surface is concave near the optical axis. The first light-emitting surface 2112 is convex, the second light-incident surface 2121 and the second light-emitting surface 2122 are both convex, and the third light-incident surface 2131 is concave.

[0085] This configuration, where the positive optical power of the first lens L1 and the convex surface shape of its object-side surface complement each other, effectively converges the light entering the lens 24, thus reducing the overall optical length of the camera module 20. The negative optical power and convex-concave surface shape of the second lens L2, combined with the optical power and surface shape of the first lens L1, smoothly transition the light collected by the first lens L1, suppressing various aberrations and improving the imaging quality of the camera module 20. The concave surface of the first light-emitting surface 2112 matches the convex surface of the second light-incident surface 2121, and the convex surface of the second light-emitting surface 2122 matches the concave surface of the third light-incident surface 2131. This not only effectively coordinates the optical power and surface shape of the first lens L1 and the second lens L2 to reasonably transition light, thus improving the imaging quality of the camera module 20, but also helps to improve the surface shape adaptability of the various opposing curved surfaces in the light guide prism 21, avoid the risk of interference between opposing curved surfaces, improve the assembly yield of the light guide prism 21, and reduce the space occupied by the light guide prism 21.

[0086] In this application, the object side of lens 241 can be understood as the surface of lens 241 facing away from the light guide prism 21, and the image side of lens 241 can be understood as the surface of lens 241 facing the light guide prism 21.

[0087] Figure 10 A schematic diagram of the camera module 20 provided in the first embodiment of this application is shown. In the first embodiment, the first lens L1 has positive optical power, the object side of the first lens L1 is spherical and convex, the image side is spherical and convex, the object side of the second lens L2 is aspherical and convex, the image side is aspherical and concave, the first light-emitting surface 2112 is spherical and concave, the second light-incident surface 2121 is spherical and convex, the second light-emitting surface 2122 is spherical and convex, and the third light-incident surface 2131 is spherical and concave.

[0088] In the first embodiment, the focal length, refractive index, and Abbe number of each lens 241 are all reference wavelengths of 555 nm, and the same applies to other embodiments. The parameters of the camera module 20 in the first embodiment are given in Table 1 below. The elements along the light propagation direction from the object plane to the imaging plane S13 are arranged sequentially from top to bottom according to Table 1. S1 and S2 correspond to the object-side and image-side surfaces of the first lens L1, S3 and S4 correspond to the object-side and image-side surfaces of the second lens L2, S5 represents the first light-incident surface 2111, S6 represents the first light-exiting surface 2112, S7 represents the second light-incident surface 2121, S8 represents the second light-exiting surface 2122, S9 represents the third light-incident surface 2131, S10 represents the third light-exiting surface 2132, S11 and S12 correspond to the object-side and image-side surfaces of the filter 28, and S13 represents the imaging plane. In Table 1, the Y-radius is the radius of curvature of the surface with the corresponding surface number at the optical axis. In the "thickness" parameter column of the first lens L1, the first value is the thickness of the first lens L1 on the optical axis, and the second value is the distance on the optical axis from the image side of the first lens L1 to the rear surface in the image side direction (the object side of the second lens L2). The second lens L2 is the same. In the "thickness" parameter column of the first sub-prism 211, the first value is the path length of light in the first sub-prism 211 (between the first light-incident surface 2111 and the first light-excising surface 2112), and the second value is the distance on the optical axis from the first light-excising surface 2112 to the rear surface (the second light-incident surface 2121). The meanings of other parameters can be obtained by referring to the above description.

[0089] Table 1

[0090]

[0091] It should be noted that in the first embodiment and the following embodiments, the camera module 20 may not be provided with a filter 28, and the distance between the third light-emitting surface 2132 and the imaging surface remains unchanged.

[0092] In the first embodiment, the aspherical coefficients of the object-side and image-side surfaces of the second lens L2 are given in Table 2 below, where surface number S3 represents the object-side surface of the second lens L2, and surface number S4 represents the image-side surface of the second lens L2. The same applies to other embodiments. From top to bottom, K-A12 represent the type of aspherical coefficient, where K represents the conic coefficient, A4 represents the fourth-order aspherical coefficient, A6 represents the sixth-order aspherical coefficient, A8 represents the eighth-order aspherical coefficient, A10 represents the tenth-order aspherical coefficient, and A12 represents the twelfth-order aspherical coefficient. The same applies to other embodiments. Furthermore, the aspherical coefficient formula is as follows:

[0093]

[0094] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Other embodiments are the same.

[0095] Table 2

[0096] Face number S3 S4 K 2.1287E+01 2.7420E+00 A4 5.0519E-04 8.3936E-04 A6 -2.4546E-05 -2.0932E-05 A8 5.2230E-07 4.6834E-07 A10 -1.4068E-08 -3.0110E-09 A12 8.4766E-11 -6.9396E-10

[0097] In the first embodiment, the focal length f of the camera module 20 is 34.8 mm, the total optical length TTL of the camera module 20 at infinity is 37.802 mm, the thickness of the light guide prism 21 (its dimension along the axis of the lens 24) is 4.4 mm, the optical back focal length BFL of the camera module 20 is 1.502 mm, the field of view (FOV) at maximum image height is 13.4°, and the aperture value FNO is 3.494. The camera module 20 achieves a good balance between image quality, sufficient field of view and light transmission, and a miniaturized design.

[0098] Please see Figure 11 , Figure 11 From left to right, the diagrams show the longitudinal spherical aberration (LSA), astigmatic field curvature (ASTIGMATIC FIELD CURVES), and distortion (DISTORTION) curves of the camera module 20 in the first embodiment. In the LSA curve, the vertical axis represents the normalized pupil coordinates from the pupil center to the pupil edge, and the horizontal axis represents the focus shift, i.e., the distance from the imaging plane to the intersection of the light ray and the optical axis. The LSA curve shows that the convergence focus deviation of light rays of different wavelengths in the first embodiment tends to be consistent, effectively suppressing blur spots or halos in the image. In the astigmatic curve, the horizontal axis represents the focus shift, and the vertical axis represents the field of view. The S-curve in the astigmatic curve represents the sagittal field curvature at 555 nm, and the T-curve represents the meridional field curvature at 555 nm. The astigmatic curve shows that the camera module 20 has a small field curvature, and both the field curvature and astigmatism of each field of view are well corrected, resulting in clear imaging at both the center and edges of the field of view. In the distortion curve diagram, the distortion curve represents the distortion magnitude corresponding to different field of view angles, where the horizontal axis represents the distortion value and the vertical axis represents the field of view angle. As can be seen from the distortion curve diagram, the image distortion caused by the main beam in camera module 20 is relatively small, resulting in excellent image quality.

[0099] refer to Figure 12 As shown, Figure 12A schematic diagram of the camera module 20 in the second embodiment is shown. In the second embodiment, the first lens L1 has positive optical power, the object side of the first lens L1 is spherical and convex, and the image side is spherical and concave. The object side of the second lens L2 is aspherical and convex, and the image side is aspherical and concave. The first light-emitting surface 2112 is spherical and concave, the second light-incident surface 2121 is spherical and convex, the second light-emitting surface 2122 is spherical and convex, and the third light-incident surface 2131 is spherical and concave.

[0100] In the second embodiment, the parameters of the camera module 20 are given in Table 3 below. The meaning of each parameter can be obtained by referring to the first embodiment.

[0101] Table 3

[0102]

[0103]

[0104] In the second embodiment, the aspherical coefficients of the object side and image side of the second lens L2 are given in Table 4 below. The meaning of each parameter can be obtained by referring to the first embodiment.

[0105] Table 4

[0106] Face number S3 S4 K 1.1361E+01 4.9249E+00 A4 1.4138E-03 1.7081E-03 A6 -7.9352E-06 3.8143E-07 A8 -1.0540E-07 -1.5858E-07 A10 1.4608E-08 2.7964E-08 A12 -3.1806E-10 -4.0511E-10

[0107] In the second embodiment, the focal length f of the camera module 20 is 34.8 mm. At infinity, the total optical length TTL of the camera module 20 is 36.802 mm. The thickness of the light guide prism 21 (its dimension along the axis of the lens 24) is 4.4 mm. The optical back focal length BFL of the camera module 20 is 1.502 mm. The field of view (FOV) at maximum image height is 13.4°, and the aperture value FNO is 3.492. The camera module 20 achieves a good balance between image quality, sufficient field of view and light transmission, and a miniaturized design.

[0108] Please see Figure 13 , Figure 13 From left to right, the diagrams show the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the camera module 20 in the second embodiment. Figure 11 The difference is that, Figure 13 The vertical axis of the astigmatism and distortion curves shown in the figure represents the image height. Figure 13 It can be seen that the longitudinal spherical aberration, astigmatism and distortion of the camera module 20 are well controlled, and the camera module 20 has good imaging quality.

[0109] refer to Figure 14 As shown, Figure 14A schematic diagram of the camera module 20 in the third embodiment is shown. In the third embodiment, the optical power, surface convexity / concavity, and spherical / aspherical types of each lens 241 are the same as in the second embodiment. The parameters of the camera module 20 in the third embodiment are given in Table 5 below, and the meaning of each parameter can be obtained by referring to the first embodiment.

[0110] The difference between this embodiment and the first and second embodiments lies in that, in the first and second embodiments, each curved surface of the light guide prism 21 is an integral structure with the corresponding sub-prism, i.e., the curved surface is formed on the sub-prism. In the third embodiment, however, the first light-emitting surface 2112, the second light-incident surface 2121, and the third light-incident surface 2131 are also formed on the corresponding sub-prism, while the second light-emitting surface 2122 is formed on a lens 241 structure independent of the sub-prism body. This not only reduces the difficulty and cost of setting the second light-emitting surface 2122, but also allows for the constraint of light direction by coordinating the refractive index difference between the prism body of the second sub-prism 212 and the lens 241 structure forming the second light-emitting surface 2122, further improving the imaging quality of the camera module 20.

[0111] Table 5

[0112]

[0113]

[0114] In the third embodiment, the aspherical coefficients of the object side and image side of the second lens L2 are given in Table 6 below. The meaning of each parameter can be obtained by referring to the first embodiment.

[0115] Table 6

[0116] Face number S3 S4 K 1.8431E+01 -9.7872E+00 A4 1.2002E-03 1.5352E-03 A6 5.3114E-06 1.3878E-05 A8 -4.9485E-07 -6.0745E-07 A10 2.8406E-08 4.3901E-08 A12 -4.4062E-10 -4.0228E-10

[0117] In the third embodiment, the focal length f of the camera module 20 is 34.8 mm. At infinity, the total optical length TTL of the camera module 20 is 36.704 mm. The thickness of the light guide prism 21 (its dimension along the axis of the lens 24) is 4.4 mm. The optical back focal length BFL of the camera module 20 is 1.504 mm. The field of view (FOV) at maximum image height is 13.4°, and the aperture value FNO is 3.492. The camera module 20 achieves a good balance between image quality, sufficient field of view and light transmission, and a miniaturized design.

[0118] Please see Figure 15 , Figure 15 From left to right, the diagrams show the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the camera module 20 in the third embodiment. Figure 15It can be seen that the longitudinal spherical aberration, astigmatism and distortion of the camera module 20 are well controlled, and the camera module 20 has good imaging quality.

[0119] Based on the first, second, and third embodiments described above, in some embodiments, the camera module 20 satisfies the condition: 1.1 ≤ R3 / R4 ≤ 2.9; where R3 is the radius of curvature of the object-side surface of the second lens L2 at the optical axis, and R4 is the radius of curvature of the image-side surface of the second lens L2 at the optical axis. For example, R3 / R4 can be 1.1, 1.5, 1.7, 2, 2.3, 2.5, or 2.9. When the above condition is satisfied, the radii of curvature of the object-side and image-side surfaces of the second lens L2 can be reasonably configured, allowing the second lens L2 to smoothly transition light rays and constrain the direction of light rays in the second lens L2. This, in conjunction with the curved surfaces in the first lens L1 and the light guide prism 21, effectively suppresses aberrations and improves the imaging quality of the camera module 20.

[0120] refer to Figure 16 As shown, in some embodiments, at least two surfaces of the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122, and the third light-incident surface 2131 are aspherical, and the number of lenses 241 with optical power in the lens 24 is one. This configuration, by making at least two curved surfaces of the light guide prism 21 aspherical, enhances the light-regulating effect of the light guide prism 21, allowing it to better share the light-regulating burden borne by the lens 24. This facilitates a further reduction in the number of lenses 241 in the lens 24, for example, allowing the number of lenses 241 with optical power in the lens 24 to be set to one, thereby further compressing the size of the camera module 20 along the axis of the lens 24.

[0121] In some embodiments, the lens 24 has one lens 241 with optical power. The lens 24 includes a first lens L1. The object-side and image-side surfaces, the first light-emitting surface 2112, the second light-incident surface 2121, the second light-emitting surface 2122, and the third light-incident surface 2131 of the first lens L1 are all curved surfaces. The object-side and image-side surfaces of the first lens L1, as well as the second light-incident surface 2121 and the second light-emitting surface 2122, are all aspherical surfaces. Placing both aspherical surfaces of the light guide prism 21 on the second sub-prism 212 also helps to reduce the manufacturing difficulty and cost of the light guide prism 21.

[0122] Please see Figure 16 As shown, Figure 16A schematic diagram of the camera module 20 in the fourth embodiment of this application is shown. In the fourth embodiment, the object-side and image-side surfaces of the first lens L1, as well as the second light-incident surface 2121 and the second light-outceasing surface 2122, are all aspherical. The first lens L1 has positive optical power. The object-side surface of the first lens L1 is convex near the optical axis. The first light-outceasing surface 2112 is spherical and concave. The second light-incident surface 2121 and the second light-outceasing surface 2122 are both aspherical and convex. The third light-incident surface 2131 is spherical and concave. The positive angle and convex-concave shape of the first lens L1 can effectively converge light rays, compress the total optical length of the camera module 20, and avoid introducing relatively serious distortions and other aberrations. Combined with the various curved surfaces in the light guide prism 21, the imaging quality of the camera module 20 can be effectively improved.

[0123] The parameters of the camera module 20 in the fourth embodiment are given in Table 7 below. The meaning of each parameter can be obtained by referring to the first embodiment.

[0124] Table 7

[0125]

[0126] In the fourth embodiment, the aspherical coefficients of the object-side surface and image-side surface of the first lens L1, as well as the second light-incident surface 2121 and the second light-exiting surface 2122, are given in Table 8 below. S1 and S2 represent the object-side surface and image-side surface of the first lens L1 in a one-to-one correspondence, S7 represents the second light-incident surface 2121, and S8 represents the second light-exiting surface 2122. The meanings of other parameters can be obtained by referring to the first embodiment.

[0127] Table 8

[0128] Face number S1 S2 S7 S8 K 1.3042E+00 -7.3386E+00 0 0 A4 -2.1249E-04 8.4561E-05 -2.7806E-04 -3.8104E-04 A6 -4.5955E-06 4.1271E-07 2.2385E-05 1.9332E-05 A8 1.3911E-07 2.1390E-07 -5.8668E-06 -1.8010E-06 A10 -1.0457E-08 -1.3728E-08 4.7288E-07 -5.2075E-08 A12 1.6342E-10 3.9089E-10 -1.4840E-08 7.1219E-09

[0129] In the fourth embodiment, the focal length f of the camera module 20 is 34.8 mm, the total optical length TTL of the camera module 20 at infinity is 36.2 mm, the thickness of the light guide prism 21 (its dimension along the axis of the lens 24) is 4.4 mm, the optical back focal length BFL of the camera module 20 is 1.5 mm, the field of view (FOV) at maximum image height is 13.5°, and the aperture value FNO is 3.492. The camera module 20 achieves a good balance between image quality, sufficient field of view and light transmission, and a miniaturized design.

[0130] Please see Figure 17 , Figure 17 From left to right, the diagrams show the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the camera module 20 in the fourth embodiment. Figure 17 It can be seen that the longitudinal spherical aberration, astigmatism and distortion of the camera module 20 are well controlled, and the camera module 20 has good imaging quality.

[0131] In some embodiments, the lens 24 further includes an aperture stop, which is disposed on the object side of the first lens L1, for example, on the object side surface of the first lens L1. The front placement of the aperture stop, in conjunction with the various curved surfaces in the camera module 20, helps to further suppress the generation of aberrations and improve the imaging quality of the camera module 20.

[0132] Based on the first, second, third, and fourth embodiments described above, in some embodiments, the camera module 20 satisfies the following conditions: 0.7 ≤ R6 / R7 ≤ 1.1; 0.9 ≤ R8 / R9 ≤ 1.7; where R6 is the radius of curvature of the first light-emitting surface 2112, R7 is the radius of curvature of the second light-incident surface 2121 at the optical axis, R8 is the radius of curvature of the second light-emitting surface 2122 at the optical axis, and R9 is the radius of curvature of the third light-incident surface 2131. For example, R6 / R7 can be 0.7, 0.8, 0.9, 1, or 1.1, and R8 / R9 can be 0.9, 1.3, 1.5, 1.6, or 1.7. When the above conditions are met, the four curved surfaces set by the light guide prism 21 can share the burden of adjusting the light of the lens 24. At the same time, it can also improve the surface shape fit between the first light-emitting surface 2112 and the second light-incident surface 2121, as well as between the second light-emitting surface 2122 and the third light-incident surface 2131. This can help reduce the assembly difficulty of the light guide prism 21 and compress the space occupied by the light guide prism 21.

[0133] In some embodiments, the camera module 20 satisfies the condition: T ≤ 10 mm; where T is the dimension of the camera module 20 along the axial direction of the lens 24, that is, the distance from the object side of the first lens L1 to the second reflecting surface 2123 along the axial direction of the lens 24, which is also the thickness dimension of the camera module 20. In some embodiments of this application, the camera module 20, by setting multiple curved surfaces in the light guide prism 21 to share the burden of adjusting light by the lens 24, can reduce the number of lenses 24, thereby enabling the dimension of the camera module 20 along the axial direction of the lens 24 to satisfy the above condition. This effectively compresses the thickness dimension of the camera module 20 while achieving good imaging quality, realizing the miniaturization design of the camera module 20, which is beneficial to meeting the requirements of the thin and light design of the electronic device 10.

[0134] The camera module 20 in each of the above embodiments satisfies the data in Table 9 below. The effects that can be obtained by satisfying the following data can be obtained by referring to the above description.

[0135] Table 9

[0136] parameter First Embodiment Second Embodiment Third Embodiment Fourth embodiment R3 / R4 2.858 1.413 1.166 R6 / R7 1 1 1 0.712 R8 / R9 1 1.563 1.606 1.645 T 9.9 8.7 8.6 8.3

[0137] refer to Figure 18 , Figure 18This is a schematic diagram of the structure of an electronic device 10 provided in an embodiment of this application. The electronic device 10 may include a radio frequency (RF) circuit 501, a memory 502 including one or more computer-readable storage media, an input unit 503, a display unit 504, a sensor 505, an audio circuit 506, a wireless Fidelity (WiFi) module 507, a processor 508 including one or more processing cores, and a power supply 509, among other components. Those skilled in the art will understand that... Figure 18 The structure of the electronic device 10 shown does not constitute a limitation on the electronic device 10. It may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0138] The radio frequency (RF) circuit 501 can be used to send and receive information, or to receive and send signals during a call. Specifically, it receives downlink information from the base station and hands it over to one or more processors 508 for processing; additionally, it sends uplink data to the base station. Typically, the RF circuit 501 includes, but is not limited to, an antenna, at least one amplifier, a tuner, one or more oscillators, a Subscriber Identity Module (SIM) card, a transceiver, a coupler, a low-noise amplifier (LNA), a duplexer, etc. Furthermore, the RF circuit 501 can also communicate wirelessly with networks and other devices. This wireless communication can use any communication standard or protocol, including but not limited to GSM, GPRS, CDMA, WCDMA, LTE, email, and SMS.

[0139] Memory 502 can be used to store applications and data. The applications stored in memory 502 contain executable code. Applications can be composed of various functional modules. Processor 508 executes various functional applications and data processing by running the applications stored in memory 502. Memory 502 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, applications required for at least one function (such as sound playback, image playback, etc.), etc.; the data storage area may store data created based on the use of electronic device 10 (such as audio data, phonebook, etc.). Furthermore, memory 502 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, memory 502 may also include a memory controller to provide access to memory 502 for processor 508 and input unit 503.

[0140] Input unit 503 can be used to receive input numbers, character information, or user characteristic information (such as fingerprints), and to generate keyboard, mouse, joystick, optical, or trackball signal inputs related to user settings and function control. Specifically, in one embodiment, input unit 503 may include a touch-sensitive surface and other input devices. The touch-sensitive surface, also known as a touch display or touchpad, can collect touch operations performed by the user on or near it (such as operations performed by the user using a finger, stylus, or any suitable object or accessory on or near the touch-sensitive surface), and drive corresponding connection devices according to a pre-set program. Optionally, the touch-sensitive surface may include two parts: a touch detection device and a touch controller. The touch detection device detects the user's touch orientation and the signal generated by the touch operation, transmitting the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts it into touch point coordinates, sends it to the processor 508, and can receive and execute commands from the processor 508.

[0141] Display unit 504 can be used to display information input by the user or information provided to the user, as well as various graphical user interfaces of electronic device 10. These graphical user interfaces can be composed of graphics, text, icons, video, and any combination thereof. Display unit 504 may include a display panel. Optionally, the display panel can be configured in the form of a liquid crystal display (LCD), organic light-emitting diode (OLED), etc. Further, a touch-sensitive surface can cover the display panel. When the touch-sensitive surface detects a touch operation on or near it, it transmits the information to processor 508 to determine the type of touch event. Subsequently, processor 508 provides corresponding visual output on the display panel according to the type of touch event. Although in Figure 18 In this context, the touch-sensitive surface and the display panel are two separate components for implementing input and output functions. However, in some embodiments, the touch-sensitive surface and the display panel can be integrated to achieve both input and output functions.

[0142] The electronic device 10 may also include at least one sensor 505, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor. The ambient light sensor can adjust the brightness of the display panel according to the ambient light level, and the proximity sensor can turn off the display panel and / or backlight when the electronic device 10 is moved to the ear. As a type of motion sensor, a gravity acceleration sensor can detect the magnitude of acceleration in various directions (generally three axes). When stationary, it can detect the magnitude and direction of gravity and can be used for applications that recognize the phone's posture (such as landscape / portrait switching, related games, magnetometer posture calibration), vibration recognition-related functions (such as pedometer, tapping), etc. Other sensors that may be configured in the electronic device 10, such as gyroscopes, barometers, hygrometers, thermometers, and infrared sensors, will not be described in detail here.

[0143] Audio circuit 506 provides an audio interface between the user and electronic device 10 via a speaker and microphone. Audio circuit 506 converts received audio data into electrical signals, transmits them to the speaker, and the speaker outputs them as sound signals. Conversely, the microphone converts collected sound signals into electrical signals, which are then received by audio circuit 506, converted back into audio data, and processed by processor 508. The audio data is then transmitted via radio frequency circuit 501 to, for example, another electronic device 10, or output to memory 502 for further processing. Audio circuit 506 may also include a headphone jack to facilitate communication between peripheral headphones and electronic device 10.

[0144] WiFi (Wireless Fidelity) is a short-range wireless transmission technology. Electronic device 10, through WiFi module 507, can help users send and receive emails, browse web pages, and access streaming media, providing users with wireless broadband internet access. Although Figure 18 The wireless fidelity module 507 is shown, but it is understood that it is not a necessary component of the electronic device 10 and can be omitted as needed without changing the nature of the invention.

[0145] The processor 508 is the control center of the electronic device 10. It connects various parts of the electronic device 10 via various interfaces and lines. By running or executing applications stored in the memory 502 and calling data stored in the memory 502, it performs various functions and processes data of the electronic device 10, thereby providing overall monitoring of the electronic device 10. Optionally, the processor 508 may include one or more processing cores; preferably, the processor 508 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications, while the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 508.

[0146] The electronic device 10 also includes a power supply 509 that supplies power to the various components. Preferably, the power supply 509 can be logically connected to the processor 508 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 509 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0147] although Figure 18 As not shown in the diagram, the electronic device 10 may also include a Bluetooth module, etc., which will not be described in detail here. In specific implementation, the above modules can be implemented as independent entities, or they can be arbitrarily combined and implemented as the same or several entities. For the specific implementation of the above modules, please refer to the previous method embodiments, which will not be described in detail here.

[0148] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0149] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A camera module, characterized in that, include: Image sensor; and, A light guide prism includes at least two separately arranged sub-prisms, one of which is opposite to the image sensor. The light guide prism is configured such that light incident on one of the sub-prisms can be reflected sequentially by the at least two sub-prisms and then exit from the sub-prism opposite to the image sensor onto the image sensor. In this configuration, at least one of the two opposing surfaces of the at least two sub-prisms is a curved surface. The light guide prism includes a first sub-prism, a second sub-prism, and a third sub-prism. The first sub-prism has a first light-incident surface and a first light-outcrystal surface at an angle to its plane. The second sub-prism has a second light-incident surface and a second light-outcrystal surface at an angle to its plane. The third sub-prism has a third light-incident surface and a third light-outcrystal surface at an angle to its plane. The first light-outcrystal surface and the second light-incident surface are opposite to each other. The second light-outcrystal surface and the third light-incident surface are opposite to each other. The third light-outcrystal surface is opposite to the image sensor. The first light-incident surface is used to allow light to enter the light guide prism. The camera module also includes a lens. The lens is disposed on one side of the first light-incident surface and is opposite to the first light-incident surface. The first light-outcrystal surface, the second light-incident surface, the second light-outcrystal surface, and the third light-incident surface are all curved surfaces and all are spherical surfaces. The number of lenses with optical power in the lens is greater than or equal to 2. The camera module satisfies the following condition: 0.7≤R6 / R7≤1.1; 0.9≤R8 / R9≤1.7; Wherein, R6 is the radius of curvature of the first light-emitting surface, R7 is the radius of curvature of the second light-incident surface at the optical axis, R8 is the radius of curvature of the second light-emitting surface at the optical axis, and R9 is the radius of curvature of the third light-incident surface.

2. The camera module according to claim 1, characterized in that, The first light-emitting surface and the second light-incident surface are spaced apart, and the second light-emitting surface and the third light-incident surface are bonded together. The camera module further includes a light-shielding layer located on one of the second light-emitting surface and the third light-incident surface. The light-shielding layer is annular, and its orthographic projection on the second light-emitting surface covers the edge contour of the second light-emitting surface. Similarly, its orthographic projection on the third light-incident surface covers the edge contour of the third light-incident surface. Alternatively, The second light-emitting surface and the third light-incident surface are spaced apart, and the first light-emitting surface and the second light-incident surface are bonded together. The camera module also includes a light-shielding layer located on one of the first light-emitting surface and the second light-incident surface. The light-shielding layer is annular, and the orthographic projection of the light-shielding layer on the first light-emitting surface covers the edge contour of the first light-emitting surface. The orthographic projection of the light-shielding layer on the second light-incident surface covers the edge contour of the second light-incident surface.

3. The camera module according to claim 1, characterized in that, The number of lenses with optical power in the lens is less than or equal to 3.

4. The camera module according to claim 1, characterized in that, The number of lenses with optical power in the lens is 2 or 3.

5. The camera module according to claim 1, characterized in that, The camera module further includes a focusing drive mechanism and an image stabilization drive mechanism. The focusing drive mechanism is used to drive the lens to move along the axial direction toward or away from the first light-incident surface. The image stabilization drive mechanism is used to drive the image sensor to move relative to the light guide prism on a plane parallel to the third light-out surface.

6. The camera module according to claim 1, characterized in that, The first light-incident surface and the third light-outceasing surface are parallel and face the same side, and the lens and the image sensor are located on the same side of the light guide prism.

7. The camera module according to claim 1, characterized in that, In the direction from the lens to the first light-incident surface along the axial direction of the lens, the lens includes a first lens and a second lens arranged sequentially. The object-side and image-side surfaces of the first lens, the object-side and image-side surfaces of the second lens, the first light-exit surface, the second light-incident surface, the second light-exit surface, and the third light-incident surface are all curved surfaces, and the object-side and image-side surfaces of the second lens are both aspherical surfaces.

8. The camera module according to claim 7, characterized in that, The first lens has positive optical power, the second lens has negative optical power, the object side of the first lens is convex, the object side of the second lens is convex near the optical axis, the image side is concave near the optical axis, the first light-emitting surface is concave, the second light-incident surface and the second light-emitting surface are convex, and the third light-incident surface is concave.

9. The camera module according to claim 7, characterized in that, The camera module satisfies the following condition: 1.1≤R3 / R4≤2.9; Wherein, R3 is the radius of curvature of the object side of the second lens at the optical axis, and R4 is the radius of curvature of the image side of the second lens at the optical axis.

10. The camera module according to any one of claims 7-9, characterized in that, The lens also includes an aperture stop, which is located on the object side of the first lens.

11. The camera module according to claim 1, characterized in that, The camera module satisfies the following condition: T≤10mm; Wherein, T is the dimension of the camera module along the axial direction of the lens.

12. The camera module according to claim 1, characterized in that, The camera module further includes a focusing drive mechanism, which drives the first sub-prism to move towards or away from the second sub-prism, wherein the direction of movement of the first sub-prism relative to the second sub-prism is perpendicular to the tangent plane at the center of the first light-emitting surface and the second light-incident surface; or... The camera module also includes a focusing drive mechanism, which drives the third sub-prism to move toward or away from the second sub-prism, and the direction of movement of the third sub-prism relative to the second sub-prism is perpendicular to the tangent plane of the center of the second light-emitting surface and the third light-incident surface.

13. The camera module according to claim 12, characterized in that, When the focusing drive mechanism is used to drive the first sub-prism to move, the focusing drive mechanism is used to drive the lens and the first sub-prism to move synchronously relative to the second sub-prism. When the focusing drive mechanism is used to drive the third sub-prism to move, the focusing drive mechanism is used to drive the third sub-prism and the image sensor to move synchronously relative to the second sub-prism.

14. The camera module according to claim 1, characterized in that, The first sub-prism has a first reflecting surface whose plane forms an angle with the plane containing the first light-incident surface and the first light-outcrystal surface; the second sub-prism has a second reflecting surface whose plane forms an angle with the plane containing the second light-incident surface and the second light-outcrystal surface; and the third sub-prism has a third reflecting surface whose plane forms an angle with the plane containing the third light-incident surface and the third light-outcrystal surface. The light guide prism is configured such that light rays incident on the first sub-prism from the first light-incident surface can be reflected sequentially by the first reflecting surface and the first light-incident surface and then exit from the first light-outcrystal surface; light rays incident on the second sub-prism from the second light-incident surface can be reflected sequentially by the second reflecting surface and then exit from the second light-outcrystal surface; and light rays incident on the third sub-prism from the third light-incident surface can be reflected sequentially by the third light-outcrystal surface and the third reflecting surface and then exit from the third light-outcrystal surface.

15. The camera module according to claim 14, characterized in that, On the cross-section of the first sub-prism, the line connecting the two ends of the first light-emitting surface is perpendicular to the first reflective surface; On the cross-section of the third sub-prism, the line connecting the two ends of the third incident surface is perpendicular to the third reflecting surface.

16. The camera module according to claim 15, characterized in that, On the cross-section of the light guide prism, the line connecting the two ends of the first light-emitting surface is parallel to the line connecting the two ends of the second light-incident surface. On the cross-section of the light guide prism, the line connecting the two ends of the second light-emitting surface is parallel to the line connecting the two ends of the third light-incident surface.

17. The camera module according to claim 14, characterized in that, The first sub-prism has a first plane facing away from the first incident light surface, and the second sub-prism also has a second plane facing away from the second reflecting surface. The central field of view principal ray is reflected at a first reflection position on the first incident light surface and at a second reflection position on the second reflecting surface. Part of the edge field of view principal ray is reflected at a third reflection position on the second plane, and another part of the edge field of view principal ray is reflected at a fourth reflection position on the first plane. In the direction along the first incident light surface from the first reflection position to the second reflection position, both the third reflection position and the fourth reflection position are located between the first reflection position and the second reflection position. Both the first light emitting surface and the second incident light surface are located between the third reflection position and the fourth reflection position. The third sub-prism has a third plane facing away from the third light-emitting surface. The central field-of-view principal ray is reflected at the fifth reflection position on the third light-emitting surface, and part of the edge field-of-view principal ray is reflected at the sixth reflection position on the third plane. Another part of the edge field-of-view principal ray is reflected at the seventh reflection position on the second plane. In the direction along the third light-emitting surface from the second reflection position to the fifth reflection position, both the sixth and seventh reflection positions are located between the second and fifth reflection positions. Both the second light-emitting surface and the third light-incident surface are located between the second and fifth reflection positions.

18. The camera module according to claim 14, characterized in that, The light guide prism is configured such that the incident angle of light on the first incident surface, the second reflecting surface, and the third emitting surface is greater than the critical angle for total internal reflection, so that total internal reflection occurs on the first incident surface, the second reflecting surface, and the third emitting surface. The camera module also includes a reflective film disposed on the first reflective surface and the third reflective surface. The reflective film is used to reflect light incident on the first reflective surface and the third reflective surface, and the average reflectivity of the reflective film is greater than or equal to 90%.

19. The camera module according to claim 14, characterized in that, The camera module also includes an anti-reflective coating disposed on the first light-incident surface and the third light-outceasing surface; The second sub-prism also has a second plane facing away from the second reflective surface, and the camera module further includes a light-shielding structure disposed on the second plane.

20. The camera module according to claim 14, characterized in that, The angle between the first incident surface and the first reflecting surface, and the angle between the third reflecting surface and the third emitting surface are 25°-40°. The second sub-prism also has a second plane opposite to the second reflecting surface. The first incident surface, the second plane, and the third emitting surface are coplanar. The second reflecting surface is parallel to the first incident surface.

21. The camera module according to claim 14, characterized in that, One of the first light-emitting surface and the second light-incident surface is a convex surface and the other is a concave surface; one of the second light-emitting surface and the third light-incident surface is a convex surface and the other is a concave surface.

22. The camera module according to claim 1, characterized in that, The camera module includes a base, a lens, a focusing drive mechanism, an image stabilization drive mechanism, and a filter. The light guide prism is disposed on the base and includes a first sub-prism, a second sub-prism, and a third sub-prism arranged sequentially along the light path propagation direction. The second sub-prism is disposed between the first sub-prism and the third sub-prism. The focusing drive mechanism and the image stabilization drive mechanism are both disposed on the base. The lens is movably disposed on the focusing drive mechanism and opposite to the first sub-prism. The image sensor is movably disposed on the image stabilization drive mechanism and opposite to the third sub-prism. The filter is disposed on the image stabilization drive mechanism and located between the third sub-prism and the image sensor.

23. An electronic device, characterized in that, Includes the camera module as described in any one of claims 1-22.

Images