Prism assembly, camera module and electronic equipment

Abstract

The invention relates to a prism assembly, a camera module and electronic equipment. The prism assembly comprises a light guide prism which is provided with a light incident area and a light emergent area; the reflecting element is provided with a reflecting surface opposite to the light guide prism, and the light guide prism is configured to be capable of enabling at least part of light rays incident from the light incident area to be reflected by the reflecting surface and then to be emitted from the light emergent area; and the anti-shake driving mechanism is used for driving the reflecting element to rotate relative to the light guide prism so as to change the emergent angle of the light reflected on the reflecting surface. According to the prism assembly, the occupied space of the anti-shake driving mechanism can be compressed while the optical anti-shake function is realized, so that the occupied space of the prism assembly can be compressed.

Description

Technical Field

[0001] The present application relates to the technical field of camera equipment, and in particular to a prism assembly, a camera module and an electronic device. Background Art

[0002] With the rapid development of camera technology, more and more electronic devices such as smart phones, tablet computers, and e-readers are equipped with camera modules to realize the camera function. In order to reduce the impact of the shaking of electronic devices on the camera quality, or to realize the function of mobile shooting, some camera modules are also equipped with anti-shake drive mechanisms such as voice coil motors to compensate for the shaking of electronic devices and improve the camera quality during shaking. However, the setting of the anti-shake drive mechanism usually leads to an increase in the height of the camera module, which is not conducive to compressing the thickness of the electronic device and the thin design of the electronic device. Summary of the invention

[0003] The embodiments of the present application provide a prism assembly, a camera module and an electronic device to solve the problem that the setting of an anti-shake drive mechanism will cause the height size of the camera module to increase.

[0004] A prism assembly, comprising:

[0005] A light-guiding prism having a light-entry area and a light-exit area;

[0006] a reflective element having a reflective surface opposite to the light guide prism, wherein the light guide prism is configured to reflect at least part of the light incident from the light incident area and then emit it from the light exit area after being reflected by the reflective surface; and

[0007] The anti-shake driving mechanism is used to drive the reflecting element to rotate relative to the light-guiding prism to change the emission angle of the light reflected on the reflecting surface.

[0008] A camera module comprises a lens, an image sensor and a prism assembly as described in any of the above embodiments, wherein the lens is opposite to the light incident area, and the image sensor is opposite to the light exit area.

[0009] An electronic device comprises the camera module as described above.

[0010] In the above-mentioned prism assembly, the anti-shake driving mechanism can drive the reflective element to rotate relative to the light-guiding prism, thereby changing the exit angle of the light reflected on the reflective surface, and then causing the light to shift as a whole at the exit position of the light in the light-exiting area, that is, achieving the effect of image plane translation, which is conducive to realizing the optical anti-shake function of the prism assembly. At the same time, the optical anti-shake is realized by rotating the reflective element relative to the light-guiding prism, which is conducive to simplifying the setting of the anti-shake driving mechanism and compressing the space occupied by the anti-shake driving mechanism, thereby helping to compress the space occupied by the prism assembly.

[0011] When the above-mentioned prism assembly is applied to a camera module, optical image stabilization is achieved by means of the rotation of the reflective element in the light guide prism used to reflect the light path. Therefore, there is no need to set up a voice coil motor or other mechanism to drive the lens or image sensor to shake to achieve optical image stabilization. The space occupied by the anti-shake drive mechanism in the axial direction of the lens can be compressed, which is beneficial to compressing the height size of the camera module. When the camera module is applied to electronic equipment, it is beneficial to the thin design of the electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 Schematic diagram of the structure of electronic equipment in some embodiments.

[0014] Figure 2 Schematic diagram of the structure of the camera module in some embodiments.

[0015] Figure 3 Schematic diagram of the light path when the reflective surface and the light-transmitting surface are at different angles in some embodiments.

[0016] Figure 4 Schematic cross-sectional view of an anti-shake driving mechanism in some embodiments.

[0017] Figure 5 FIG. 4 is a schematic structural diagram of an anti-shake driving mechanism provided with four piezoelectric deformation structures in some embodiments.

[0018] Figure 6 Schematic cross-sectional view of some components of the anti-shake drive mechanism in some embodiments.

[0019] Figure 7 Schematic cross-sectional view of a piezoelectric deformation structure in some embodiments.

[0020] Figure 8 Schematic diagram of the structure of the piezoelectric deformation structure in different states in some embodiments.

[0021] Fig. 9 Schematic diagram of the optical path of the camera module when the angle between the reflective surface and the light-transmitting surface is 33° in some embodiments.

[0022] Fig.10 This is a schematic diagram of the structure in which the electronic device further includes other components in some embodiments.

[0023] Reference numerals;

[0024] 10. electronic device; 11. light inlet; 20. camera module; 21. lens; 22. image sensor; 23. focus drive mechanism; 30. prism assembly; 31. light guide prism; 311. light transmission surface; 3111. light entrance area; 3112. light exit area; 312. first surface; 313. second surface; 32. reflective element; 321. reflective surface; 33. anti-shake drive mechanism; 331. piezoelectric deformation structure; 3311. electrode layer; 3312. first piezoelectric film; 3313. first elastic substrate; 3314. substrate layer; 3315. second elastic substrate; 3316. second piezoelectric film; 332. frame; 333. padding structure; 334. circuit board; 335. shell; 34. deformation element; 35. first direction; 36. second direction; 37. third direction; 38. fourth direction. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0026] As used herein, "electronic device" refers to a device that can receive and / or send communication signals, including but not limited to a device that is connected via any one or more of the following connection methods:

[0027] (1) Connection via wired lines, such as Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, and direct cable connection;

[0028] (2) Via wireless interfaces, such as cellular networks, wireless local area networks (WLAN), digital television networks such as DVB-H networks, satellite networks, and AM-FM broadcast transmitters.

[0029] An electronic device configured to communicate via a wireless interface may be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:

[0030] (1) Satellite phone or cellular phone;

[0031] (2) Personal Communications System (PCS) terminals that can combine cellular radio telephones with data processing, fax, and data communications capabilities;

[0032] (3) Radiotelephone, pager, Internet / Intranet access, Web browser, notepad, calendar, Personal Digital Assistant (PDA) equipped with a Global Positioning System (GPS) receiver;

[0033] (4) conventional laptop and / or handheld receivers;

[0034] (5) Conventional laptop and / or palmtop radiotelephone transceivers, etc.

[0035] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 The structural schematic diagrams of the electronic device 10 and the camera module 20 in some embodiments of the present application are respectively shown. The camera module 20 provided in the present application can be used in any applicable electronic device 10 such as a smart phone, a tablet computer, an e-reader, etc., so that the electronic device 10 can realize the camera function. The camera module 20 may include a lens 21, an image sensor 22, and a prism assembly 30. The lens 21 may include one or more lenses with optical power. The back cover of the electronic device 10 is provided with a light inlet 11. When the camera module 20 is applied to the electronic device 10, the lens 21 is opposite to the light inlet 11 to collect ambient light through the light inlet 11. The image sensor 22 includes but is not limited to a charge-coupled device (Charge-coupled Device) or a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS). At least part of the light collected by the lens 21 can be transmitted to the image sensor 22 by the prism assembly 30. The image sensor 22 can convert the received light signal into an electrical signal and transmit it to the central processing unit of the electronic device 10, or a control element such as a chip specifically used for image processing in the electronic device 10, so as to realize the camera function.

[0036] In some embodiments, the prism assembly 30 includes a light guide prism 31 and a reflective element 32. The light guide prism 31 includes but is not limited to a prism made of plastic or glass. The light guide prism 31 has a light entry area 3111 and a light exit area 3112 spaced apart from each other. The light entry area 3111 is opposite to the lens 21, and the light exit area 3112 is opposite to the image sensor 22. The reflective element 32 has a reflective surface 321 facing the light guide prism 31 and opposite to the light guide prism 31. The light guide prism 31 is configured to receive at least part of the light emitted by the lens 21 through the light entry area 3111, and to emit at least part of the light incident on the light guide prism 31 from the light entry area 3111 to the image sensor 22 after being reflected by the reflective surface 321. That is, the light path between the lens 21 and the image sensor 22 is conducted within the prism assembly 30, and the reflective element 32 located outside the light guide prism 31 participates in the conduction of light by the light guide prism 31 through reflection. For example, in some embodiments, the light-guiding prism 31 further has a first surface 312, and the reflecting surface 321 is opposite to the first surface 312. Part of the light path transmitted in the light-guiding prism 31 will pass through the first surface 312 and hit the reflecting surface 321. After being reflected on the reflecting surface 321, it will pass through the first surface 312 again, so that the reflecting element 32 participates in the light path deflection in the light-guiding prism 31.

[0037] Furthermore, combined with Figure 3 and Figure 4 As shown, in some embodiments, the prism assembly 30 also includes an anti-shake drive mechanism 33, which is connected to the reflective element 32 and is used to drive the reflective element 32 to rotate relative to the light-guiding prism 31 to change the angle between the reflective surface 321 and the first surface 312, thereby changing the incident angle of the light passing through the first surface 312 and hitting the reflective surface 321 on the reflective surface 321, and further changing the exit angle of the light reflected on the reflective surface 321. Figure 3 The reflecting element 32 and the light path indicated by the solid line and the reflecting element 32 and the light path indicated by the dotted line respectively correspond to the states of different angles between the reflecting surface 321 and the first surface 312. Figure 3 It can be seen that when the anti-shake drive mechanism 33 drives the reflective element 32 to rotate relative to the light-guiding prism 31 to change the angle between the reflective surface 321 and the first surface 312, the change in the exit angle of the light reflected on the reflective surface 321 will cause the exit position of the light in the light exit area 3112 to change when the light is emitted from the light exit area 3112 to the image sensor 22, thereby achieving the effect of the image sensor 22 remaining in position while the image plane is shifted. The translation of the image plane is beneficial to compensate for the jitter in the camera module 20 and the electronic device 10 during the shooting process, thereby realizing the optical anti-shake function, which is beneficial to improving the imaging quality of the camera module 20.

[0038] The above-mentioned prism assembly 30, the reflective element 32 is a component that participates in the deflection of light in the prism assembly 30, and optical image stabilization is achieved by rotating the reflective element 32 relative to the light guide prism 31. The optical image stabilization function can be integrated into the prism assembly 30, which is conducive to simplifying the setting of the anti-shake driving mechanism 33 and compressing the space occupied by the anti-shake driving mechanism 33, thereby facilitating the compression of the space occupied by the prism assembly 30. When the above-mentioned prism assembly 30 is applied to the camera module 20, optical image stabilization is achieved by rotating the reflective element 32 used for reflecting the light path in the light guide prism 31, so that there is no need to set a mechanism such as a voice coil motor to drive the lens 21 or the image sensor 22 to shake to achieve optical image stabilization, and the space occupied by the anti-shake driving mechanism 33 in the axial direction of the lens 21 can be compressed, thereby facilitating the compression of the height dimension of the camera module 20. When the camera module 20 is applied to the electronic device 10, it is conducive to the thin design of the electronic device 10.

[0039] refer to Figure 2 As shown, in some embodiments, the light guide prism 31 further includes a light-transmitting surface 311, a light-entering area 3111 and a light-exiting area 3112 are formed on the light-transmitting surface 311, and the light-transmitting surface 311 may be perpendicular to the axial direction of the lens 21 and parallel to the photosensitive surface of the image sensor 22. The first surface 312 is obliquely opposite to the light-entering area 3111, that is, the reflective surface 321 is inclined to the axial direction of the lens 21. Therefore, when optical image stabilization is achieved by driving the reflective surface 321 to rotate, at least part of the size of the reflective element 32 and the anti-shake driving mechanism 33 can overlap with the light guide prism 31 in the axial direction of the lens 21, which is conducive to reducing the space occupied by the reflective element 32 and the anti-shake driving mechanism 33 in the axial direction of the lens 21, thereby facilitating the compression of the height dimension of the camera module 20 and facilitating the thin design of the electronic device 10.

[0040] In some embodiments, the camera module 20 further includes a focus drive mechanism 23, which includes but is not limited to a voice coil motor, etc. The focus drive mechanism 23 is used to drive the lens 21 to move axially toward or away from the light-transmitting surface 311 to change the optical path between the lens 21 and the image sensor 22 to achieve an optical focus function. Figure 2 It can be seen that the focus drive mechanism 23 drives the lens 21 to move, while the anti-shake drive mechanism 33 drives the reflective element 32 to rotate, which separates the focus drive mechanism 23 and the anti-shake drive mechanism 33. This is beneficial to avoid crosstalk between the focus and anti-shake processes, and reduces the design and preparation difficulty of the focus drive mechanism 23 and the anti-shake drive mechanism 33. Moreover, compared with integrating the focus and anti-shake into the lens 21, it is beneficial to reduce the axial dimension of the lens 21, thereby facilitating the compression of the height dimension of the camera module 20 and facilitating the thin design of the electronic device 10.

[0041] In some embodiments, the light guide prism 31 further includes a second surface 313, the first surface 312 is obliquely opposite to the light entrance area 3111, the second surface 313 is obliquely opposite to the light exit area 3112, two reflective elements 32 are provided, and the reflective surfaces 321 of the two reflective elements 32 are respectively opposite to the first surface 312 and the second surface 313, and the light guide prism 31 is configured to be able to reflect at least part of the light incident from the light entrance area 3111 and then emit it from the light exit area 3112 after being reflected by the two reflective surfaces 321 in sequence. Among them, the light passes through the first surface 312 before and after being reflected on the reflective surface 321 opposite to the first surface 312, and the light passes through the second surface 313 before and after being reflected on the reflective surface 321 opposite to the second surface 313. Two anti-shake driving mechanisms 33 are provided, and the two anti-shake driving mechanisms 33 are respectively used to drive the two reflective elements 32 to rotate relative to the light guide prism 31 to change the angle between the two reflective surfaces 321 and the first surface 312 and the second surface 313. The two reflective elements 32 can participate in the light path deflection of the light-guiding prism 31. By causing the light to be reflected at least twice in the prism assembly 30, the optical path of the light in the prism assembly 30 can be extended, so that the camera module 20 can achieve a telephoto design. At the same time, two anti-shake driving mechanisms 33 are set to realize optical image stabilization by driving the reflective elements 32 participating in the light path deflection in the prism assembly 30 to rotate. This can make full use of the structure of the prism assembly 30, improve the structural utilization efficiency of the prism assembly 30, and effectively compress the height dimension of the camera module 20. The rotation of the two reflective elements 32 superimposes the translation effect of the image plane, which is also beneficial to increase the anti-shake stroke of the camera module 20 and improve the anti-shake ability of the camera module 20.

[0042] exist Figure 2 and Figure 3 In the illustrated embodiment, the light is reflected three times in the prism assembly 30, which can effectively fold the light path and realize the telephoto design of the camera module 20. Specifically, at least part of the light entering the light guide prism 31 from the light incident area 3111 is incident on the first surface 312 to the reflective surface 321 opposite to the first surface 312, and is reflected by the reflective surface 321 and passes through the first surface 312 to the light-transmitting surface 311, and is reflected by the light-transmitting surface 311 and passes through the second surface 313 to the reflective surface 321 opposite to the second surface 313, and is further reflected by the reflective surface 321 and passes through the second surface 313 to exit from the light exit area 3112.

[0043] Of course, according to the different requirements of the size and focal length of the camera module 20, the light can also be reflected twice, five times or other times in the prism assembly 30 to adapt to the different telephoto designs of the camera module 20, as long as the rotation of the two reflective elements 32 relative to the light-guiding prism 31 can realize the optical image stabilization function through the image plane shift. For example, when the prism assembly 30 is reflected twice, at least part of the light incident from the light incident area 3111 passes through the first surface 312 to the reflective surface 321 opposite to the first surface 312, is reflected by the reflective surface 321 and passes through the first surface 312 to the second surface 313, and then passes through the second surface 313 to the reflective surface 321 opposite to the second surface 313, and is reflected by the reflective surface 321 and then passes through the second surface 313 to exit from the light exit area 3112. When the prism assembly 30 is reflected five times, the light-guiding prism 31 further includes a bottom surface connected to the first surface 312 and the second surface 313 and opposite to and parallel to the light-transmitting surface 311. At least part of the light incident from the light-entering area 3111 is reflected by the reflective surface 321 opposite to the first surface 312 to the light-transmitting surface 311, and is reflected by the light-transmitting surface 311 to the bottom surface, thereby being reflected by the bottom surface and incident on the light-transmitting surface 311 again, and then reflected by the light-transmitting surface 311 to the reflective surface 321 opposite to the second surface 313, and is set from the light-exiting area 3112 after being reflected by the reflective surface 321. According to the different reflections of the light in the prism assembly 30, the size of the light-guiding prism 31 and the angle range between the two reflective surfaces 321 and the light-transmitting surface 311 can be set differently, as long as the corresponding optical path can be achieved, and it will not be repeated in this application.

[0044] Combination Figure 2 and Figure 4 As shown, in some embodiments, the prism assembly 30 further includes a deformation element 34, which is disposed between the first surface 312 and the reflective surface 321, and is connected to the first surface 312 and the reflective surface 321, and the deformation element 34 can be deformed with the rotation of the reflective element 32. The arrangement of the deformation element 34 can provide support for the arrangement of the reflective element 32 on the light guide prism 31, and can be deformed with the rotation of the reflective element 32, and is not likely to interfere with the rotation of the reflective element 32. In addition, the deformation element 34 is arranged on the reflective surface 321 and the light guide prism 31, and the refractive index of the deformation element 34 is greater than the refractive index of the air medium, which can reduce the probability of total reflection directly on the first surface 312 when the light hits the first surface 312, thereby facilitating the stability of the anti-shake function achieved by using the reflective element 32.

[0045] In some embodiments, the difference between the refractive index of the deformable element 34 and the refractive index of the light-guiding prism 31 is less than or equal to 0.2, so that the refractive index of the deformable element 34 is close to that of the light-guiding prism 31, and when the light is incident on the first surface 312 in the light-guiding prism 31, it can pass through the first surface 312 and the deformable element 34 to the reflective surface 321, and is not easy to be reflected at the interface between the first surface 312 and the deformable element 34. The material of the deformable element 34 includes but is not limited to any applicable polymer material, as long as it can meet the refractive index requirements and can be deformed with the rotation of the reflective element 32. In some embodiments, the refractive index of the deformable element 34 is greater than or equal to 1.4 and less than or equal to 1.9, and the refractive index of the light-guiding prism 31 is greater than or equal to 1.5 and less than or equal to 1.9.

[0046] Combination Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments, the anti-shake drive mechanism 33 includes four piezoelectric deformation structures 331. For the reflective element 32 opposite to the first surface 312, two of the piezoelectric deformation structures 331 are respectively connected to the two opposite edges of the reflective element 32 in the first direction 35, and can be deformed when powered on to drive the reflective element 32 to rotate around an axis parallel to the second direction 36. The other two piezoelectric deformation structures 331 are respectively connected to the two opposite edges of the reflective element 32 in the second direction 36, and can be deformed when powered on to drive the reflective element 32 to rotate around an axis parallel to the first direction 35. The first direction 35 and the second direction 36 are two mutually perpendicular directions on a plane parallel to the first surface 312, wherein the second direction 36 is parallel to the light-transmitting surface 311 and perpendicular to the axial direction of the lens 21. It can be understood that when the two piezoelectric deformation structures 331 relative to each other in the first direction 35 drive the reflective element 32 to rotate around an axis parallel to the second direction 36, the image plane of the camera module 20 can be driven to translate in the fourth direction 38, and the fourth direction 38 is parallel to the photosensitive surface of the image sensor 22 and parallel to the vertical line between the lens 21 and the image sensor 22. When the two piezoelectric deformation structures 331 relative to each other in the second direction 36 drive the reflective element 32 to rotate around an axis parallel to the first direction 35, the image plane of the camera module 20 can be driven to translate in a fifth direction (not marked in the figure) parallel to the photosensitive surface of the image sensor 22 and perpendicular to the fourth direction 38. Therefore, the cooperation of the four piezoelectric deformation structures 331 can realize the jitter of the image plane in two directions perpendicular to each other on a plane parallel to the photosensitive surface of the image sensor 22, thereby effectively realizing the optical image stabilization function.

[0047] It should be noted that the above-mentioned first direction 35 and second direction 36 are only for the reflective element 32 opposite to the first surface 312, and the reflective element 32 opposite to the second surface 313 and the anti-shake drive mechanism 33 are arranged similarly. The anti-shake drive mechanism 33 includes four piezoelectric deformation structures 331. The four piezoelectric deformation structures 331 are arranged opposite to each other in two directions parallel to the second surface 313 and perpendicular to each other. The two piezoelectric deformation structures 331 opposite to each other in one direction can drive the reflective element 32 to rotate so that the image plane is translated in the fourth direction 38, and the two piezoelectric deformation structures 331 opposite to each other in the other direction can drive the reflective element 32 to rotate so that the image plane is translated in the fifth direction. The translation of the image plane in the fourth direction 38 and the fifth direction generated by the cooperation of the two anti-shake drive mechanisms 33 and the two reflective elements 32 can be superimposed, so as to jointly realize the optical anti-shake function of the camera module 20.

[0048] Combination Figure 5 and Figure 7 As shown, in some embodiments, for the reflective element 32 and the anti-shake driving mechanism 33 opposite to the first surface 312, the piezoelectric deformation structure 331 includes an electrode layer 3311, a first piezoelectric film 3312, an electrode layer 3311, a first elastic substrate 3313, a substrate layer 3314, a second elastic substrate 3315, an electrode layer 3311, a second piezoelectric film 3316, and an electrode layer 3311, which are sequentially stacked in a third direction 37 perpendicular to the first direction 35 and the second direction 36. The material of the first piezoelectric film 3312 and the second piezoelectric film 3316 includes, but is not limited to, any applicable piezoelectric material such as lead zirconate titanate (PZT), which can be formed by deposition on the elastic substrate using a micro-electro-mechanical systems (MEMS) process, the material of each electrode layer 3311 includes, but is not limited to, a conductive material such as platinum, the material of the elastic substrate includes, but is not limited to, silicon, and the material of the substrate layer 3314 includes, but is not limited to, an insulating material such as silicon dioxide.

[0049] It is understandable that when the piezoelectric film is energized through the electrode layers 3311 on both sides of the first piezoelectric film 3312 or the second piezoelectric film 3316, the piezoelectric film can drive the elastic substrate to deform so that the entire piezoelectric deformation structure 331 is deformed, thereby driving the reflective element 32 to rotate relative to the light guide prism 31. Figure 5 and Figure 8As shown, in some embodiments, the piezoelectric deformation structure 331 includes a first end connected to the reflective element 32 and a second end away from the reflective element 32. When the first piezoelectric film 3312 is energized, the first end can deform in one direction of the third direction 37. When the second piezoelectric film 3316 is energized, the first end can deform in another direction of the third direction 37. Figure 8 3 shows the states of the piezoelectric deformable structure 331 when the piezoelectric deformable structure 331 is not energized, the first piezoelectric film 3312 is energized, and the second piezoelectric film 3316 is energized, respectively. It is defined that the deformation direction of the first end of the first piezoelectric film 3312 when energized is the positive direction of the third direction 37. When the first piezoelectric film 3312 of one of the two piezoelectric deformable structures 331 opposite to each other in the first direction 35 is energized and the second piezoelectric film 3316 of the other is energized, the first end of one of the piezoelectric deformable structures 331 is deformed in the positive direction of the third direction 37, and the first end of the other piezoelectric deformable structure 331 is deformed in the negative direction of the third direction 37. The cooperation of the two piezoelectric deformable structures 331 can drive the reflective element 32 to rotate relative to the light-guiding prism 31 around an axis parallel to the second direction 36, for example, so that the reflective surface 321 opposite to the first surface 312 is rotated from Figure 3 The solid line state shown is rotated to the dotted line state, so that the image plane is translated in the fourth direction 38 .

[0050] It can be seen from the above description that the first piezoelectric film 3312 of one of the two piezoelectric deformation structures 331 opposite to each other in one direction and the second piezoelectric film 3316 of the other piezoelectric deformation structure 331 are respectively energized, which can drive the reflective element 32 to rotate relative to the light guide prism 31. Of course, the mechanism that the two piezoelectric deformation structures 331 opposite to each other in the second direction 36 drive the reflective element 32 to rotate around an axis parallel to the first direction 35 is similar. It can be understood that the above-mentioned first direction 35, second direction 36 and third direction 37 are used as references to describe only the rotation anti-shake mechanism of the reflective element 32 opposite to the first surface 312 and the anti-shake driving mechanism 33 connected to the reflective element 32. The structural setting and driving mechanism of the reflective element 32 opposite to the second surface 313 and the anti-shake driving mechanism 33 connected to the reflective element 32 are similar, which can be obtained by referring to the above description. As long as the reflective element 32 can be driven to rotate around two axes parallel to the second surface 313 and perpendicular to each other, it will not be repeated in this application.

[0051] Please see again Figure 4As shown, in some embodiments, the anti-shake driving mechanism 33 further includes a frame 332. The material of the frame 332 includes but is not limited to any applicable material such as silicon. The frame 332 surrounds the reflective element 32 and the plurality of piezoelectric deformation structures 331, and is connected to one end of the four piezoelectric deformation structures 331 away from the reflective element 32, that is, connected to the second ends of the four piezoelectric deformation structures 331. The frame 332 is provided to provide support for the four piezoelectric deformation structures 331, which can improve the structural strength and stability of the anti-shake driving mechanism 33, and at the same time provide support for the second ends of the four piezoelectric deformation structures 331, thereby improving the accuracy and reliability of the piezoelectric deformation structure 331 driving the reflective element 32 to rotate during the deformation process.

[0052] In some embodiments, the anti-shake driving mechanism 33 further includes a cushioning structure 333, a circuit board 334, and a housing 335. The cushioning structure 333 is disposed between the frame 332 and the circuit board 334, so that the reflective element 32 is suspended on the circuit board 334, providing space for the reflective element 32 to rotate between the light guide prism 31 and the circuit board 334. The circuit board 334 is electrically connected to the piezoelectric deformation structure 331 through conductive elements such as wires to supply power to the electrode layers 3311 on both sides of the first piezoelectric film 3312 or the second piezoelectric film 3316 of the piezoelectric deformation structure 331. The housing 335 is disposed on the circuit board 334 and around the frame 332 to provide protection for the reflective element 32, the deformation element 34, and the piezoelectric deformation structure 331, thereby improving the structural reliability of the anti-shake driving mechanism 33. In some embodiments, the reflective element 32 may be formed of a glass or silicon substrate and a reflective film coated on the side of the substrate facing the light guide prism 31 , as long as it can reflect the light from the light guide prism 31 .

[0053] In some embodiments, under the adjustment of the anti-shake driving mechanism 33, the adjustable range of the angle between the two reflective surfaces 321 and the light-transmitting surface 311 is 25°-35°, so as to achieve optical anti-shake by rotating the reflective element 32 while maintaining the folded light path of the light reflected three times in the prism assembly 30. Of course, according to the different times of reflection of the prism assembly 30, the adjustable range of the angle between the two reflective surfaces 321 and the light-transmitting surface 311 can also have other settings, which will not be described in detail in this application.

[0054] Please see again Figure 2 and Figure 3As shown, in some embodiments, the two anti-shake driving mechanisms 33 can drive the two reflective elements 32 to rotate synchronously relative to the light guide prism 31, and when the reflective element 32 rotates to different states, the angles between the two reflective surfaces 321 and the light-transmitting surface 311 are equal. Thus, the translation effects of the two reflective surfaces 321 on the image plane can be controlled to be roughly equivalent, so that the superposition calculation and control of the translation effects of the two reflective surfaces 321 on the image plane are simpler, which is conducive to reducing the difficulty and cost of the anti-shake control of the camera module 20.

[0055] For example, in Figure 3 In the illustrated embodiment, the distance between the center of the image plane and the center of the object plane (i.e., the optical center distance of the camera module 20) is defined as H, the optical path of the light in the prism assembly 30, i.e., the optical path from the light entrance area 3111 to the light exit area 3112 is L, the angles between the two reflective surfaces 321 and the light-transmitting surface 311 are both θ, and the optical center distance satisfies: H=L*tanθ. It can be seen that when the axis of the lens 21 is fixed relative to the light-guiding prism 31, simultaneously changing the angle θ between the two reflective surfaces 321 and the light-transmitting surface 311 can change H, that is, the image plane is translated in the fourth direction 38. According to the above conditional formula, the translation amount of the image plane can be precisely controlled, thereby improving the control accuracy of optical image stabilization. In some embodiments, when the angle between the two reflective surfaces 321 and the light-transmitting surface 311 decreases, the image plane translates in the direction close to the lens 21, and the optical center distance of the camera module 20 decreases. Of course, Figure 3 Only the translation of the image plane in the fourth direction 38 is illustrated, corresponding to the situation where the reflective element 32 opposite to the first surface 312 rotates around an axis parallel to the second direction 36. The translation of the image plane in the fifth direction is similar, which can be obtained by referring to the above records and will not be repeated in this application. It should be noted that in other embodiments, during the optical image stabilization process, only one of the two reflective elements 32 can be rotated relative to the light-guiding prism 31, or the two reflective elements 32 have different rotation angles relative to the light-transmitting surface 311. In this case, the image plane translation generated by the two reflective elements 32 can be calculated separately, and the image plane translation of the camera module 20 can be obtained by superimposing the effects of the two reflective elements 32, as long as the optical image stabilization function can be accurately realized.

[0056] See also Fig. 9 As shown, Fig. 9The optical path diagram of the camera module 20 is shown when the angle between the two reflective surfaces 321 and the light-transmitting surface 311 is 33°. In another state, the angle between the two reflective surfaces 321 and the light-transmitting surface 311 can also be 34°. In another state, the angle between the two reflective surfaces 321 and the light-transmitting surface 311 can also be 32°. In some embodiments, when the angles between the reflective surfaces 321 and the light-transmitting surface 311 are 33°, 34°, and 32°, respectively, the optical center distances of the camera module 20 are 11.881 mm, 12.335 mm, and 11.427 mm, respectively. The state where the angle between the reflective surface 321 and the light-transmitting surface 311 is 34° is relatively Fig. 9 For the corresponding state, in the fourth direction 38, the OIS stroke of the camera module 20 is +454um≈+1.23°, and the angle between the reflective surface 321 and the transparent surface 311 is 32°. Fig. 9 In the corresponding state, the OIS of the camera module 20 is formed to be -454um≈-1.23° in the fourth direction 38. It can be seen that when the angle between the two reflective surfaces 321 and the light-transmitting surface 311 increases, the optical center distance of the camera module 20 increases, and when the angle between the two reflective surfaces 321 and the light-transmitting surface 311 decreases, the optical center distance of the camera module 20 decreases, and the optical image stabilization function in any direction in the opposite direction can be realized.

[0057] refer to Fig.10 , Fig.10 The electronic device 10 is a schematic diagram of the structure of the electronic device 10 provided in the embodiment of the present 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. Those skilled in the art will understand that Fig.10 The structure of the electronic device 10 shown in the figure does not constitute a limitation on the electronic device 10, and the electronic device 10 may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0058] The radio frequency circuit 501 can be used to send and receive information, or receive and send signals during a call. In particular, after receiving the downlink information of the base station, it is handed over to one or more processors 508 for processing; in addition, the data related to the uplink is sent to the base station. Generally, the radio frequency 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. In addition, the radio frequency circuit 501 can also communicate with the network and other devices through wireless communication. The wireless communication can use any communication standard or protocol, including but not limited to the Global System of Mobile Communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Messaging Service (SMS), etc.

[0059] The memory 502 can be used to store applications and data. The applications stored in the memory 502 contain executable codes. The applications can form various functional modules. The processor 508 executes various functional applications and data processing by running the applications stored in the memory 502. The memory 502 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the electronic device 10 (such as audio data, a phone book, etc.), etc. In addition, the memory 502 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 502 can also include a memory controller to provide the processor 508 and the input unit 503 with access to the memory 502.

[0060] The input unit 503 can be used to receive input digital, character information or user feature information (such as fingerprints), and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control. Specifically, in a specific embodiment, the input unit 503 may include a touch-sensitive surface and other input devices. The touch-sensitive surface, also known as a touch display screen or a touch pad, can collect user touch operations on or near it (such as operations performed by users using fingers, styluses, or any other suitable objects or accessories 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 a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into touch point coordinates, and then sends it to the processor 508, and can receive and execute commands sent by the processor 508.

[0061] The display unit 504 can be used to display information input by the user or information provided to the user and various graphical user interfaces of the electronic device 10, which can be composed of graphics, text, icons, videos and any combination thereof. The display unit 504 may include a display panel. Optionally, the display panel can be configured in the form of a liquid crystal display (LCD, Liquid Crystal Display), an organic light-emitting diode (OLED, Organic Light-Emitting Diode), etc. Further, the touch-sensitive surface may cover the display panel, and when the touch-sensitive surface detects a touch operation on or near it, it is transmitted to the processor 508 to determine the type of touch event, and then the processor 508 provides a corresponding visual output on the display panel according to the type of touch event. Although in Fig.10 In the embodiment, the touch-sensitive surface and the display panel are implemented as two independent components to realize input and output functions, but in some embodiments, the touch-sensitive surface and the display panel can be integrated to realize input and output functions.

[0062] 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, wherein the ambient light sensor may adjust the brightness of the display panel according to the brightness of the ambient light, and the proximity sensor may turn off the display panel and / or backlight when the electronic device 10 is moved to the ear. As a type of motion sensor, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that identify the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc. that can also be configured in the electronic device 10, they will not be repeated here.

[0063] The audio circuit 506 can provide an audio interface between the user and the electronic device 10 through a speaker and a microphone. The audio circuit 506 can convert the received audio data into an electrical signal, transmit it to the speaker, and convert it into a sound signal for output; on the other hand, the microphone converts the collected sound signal into an electrical signal, which is received by the audio circuit 506 and converted into audio data, and then the audio data is output to the processor 508 for processing, and then sent to another electronic device 10 through the radio frequency circuit 501, or the audio data is output to the memory 502 for further processing. The audio circuit 506 may also include an earphone socket to provide communication between an external earphone and the electronic device 10.

[0064] Wireless Fidelity (WiFi) is a short-range wireless transmission technology. The electronic device 10 can help users send and receive emails, browse web pages, and access streaming media through the wireless fidelity module 507, which provides users with wireless broadband Internet access. Fig.10 The wireless fidelity module 507 is shown, but it is understandable that it is not a necessary component of the electronic device 10 and can be omitted as needed without changing the essence of the invention.

[0065] The processor 508 is the control center of the electronic device 10. It uses various interfaces and lines to connect various parts of the entire electronic device 10. By running or executing applications stored in the memory 502 and calling data stored in the memory 502, it executes various functions of the electronic device 10 and processes data, thereby monitoring the electronic device 10 as a whole. 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 processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 508.

[0066] The electronic device 10 also includes a power supply 509 for supplying power to various components. Preferably, the power supply 509 can be logically connected to the processor 508 through a power management system, so that the power management system can manage charging, discharging, and power consumption. The power supply 509 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0067] although Fig.10 Not shown, 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 can be arbitrarily combined and implemented as the same or several entities. The specific implementation of the above modules can refer to the previous method embodiment, which will not be described in detail here.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0069] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A prism assembly, characterized in that: include: A light-guiding prism having a light-entry area and a light-exit area; a reflective element having a reflective surface opposite to the light guide prism, wherein the light guide prism is configured to reflect at least part of the light incident from the light incident area and then emit it from the light exit area; and, The anti-shake driving mechanism is used to drive the reflecting element to rotate relative to the light-guiding prism to change the emission angle of the light reflected on the reflecting surface.

2. The prism assembly according to claim 1, characterized in that: The light-guiding prism has a first surface, and the reflecting surface is opposite to the first surface. At least part of the light incident on the light-guiding prism from the light incident area passes through the first surface and hits the reflecting surface, and then passes through the first surface again after being reflected on the reflecting surface. The anti-shake driving mechanism is used to change the angle of the reflecting surface relative to the first surface.

3. The prism assembly according to claim 2, characterized in that: The prism assembly further comprises a deformation element, wherein the deformation element is arranged between the first surface and the reflecting surface and connected to the first surface and the reflecting surface, and the deformation element can be deformed along with the rotation of the reflecting element.

4. The prism assembly according to claim 3, characterized in that: The difference between the refractive index of the deformable element and the refractive index of the light-guiding prism is less than or equal to 0.

2.

5. The prism assembly according to claim 4, characterized in that: The refractive index of the deformable element is 1.4-1.9, and the refractive index of the light-guiding prism is 1.5-1.

9.

6. The prism assembly according to claim 2, characterized in that: The anti-shake drive mechanism includes four piezoelectric deformation structures, two of which are respectively connected to two opposite edges of the reflective element in a first direction, and can be deformed when energized to drive the reflective element to rotate around an axis parallel to a second direction, and the other two piezoelectric deformation structures are respectively connected to two opposite edges of the reflective element in the second direction, and can be deformed when energized to drive the reflective element to rotate around an axis parallel to the first direction, and the first direction and the second direction are two directions perpendicular to each other on a plane parallel to the first surface.

7. The prism assembly according to claim 6, characterized in that: The piezoelectric deformation structure includes a first piezoelectric film, a first elastic substrate, a base material layer, a second elastic substrate and a second piezoelectric film stacked in sequence in a third direction. When the first piezoelectric film is energized, one end of the piezoelectric deformation structure connected to the reflective element can be deformed in one direction of the third direction. When the second piezoelectric film is energized, one end of the piezoelectric deformation structure connected to the reflective element can be deformed in the other direction of the third direction. The third direction is perpendicular to the first direction and the second direction.

8. The prism assembly according to claim 6, characterized in that: The anti-shake driving mechanism also includes a frame, which is arranged around the reflective element and connected to one end of the four piezoelectric deformation structures away from the reflective element.

9. The prism assembly according to claim 8, characterized in that: The anti-shake driving mechanism also includes a cushioning structure, a circuit board and a shell. The cushioning structure is arranged between the frame and the circuit board so that the reflective element is suspended on the circuit board. The circuit board is electrically connected to the piezoelectric deformation structure. The shell is arranged on the circuit board and around the frame.

10. The prism assembly according to claim 1, wherein: The light-guiding prism has a first surface and a second surface, the first surface is obliquely opposite to the light-entering area, and the second surface is obliquely opposite to the light-exiting area. Two reflective elements are provided, and the reflective surfaces of the two reflective elements are respectively opposite to the first surface and the second surface. The light-guiding prism is configured to be able to reflect at least part of the light incident from the light-entering area through the two reflective surfaces in sequence and then emit it from the light-exiting area. Two anti-shake driving mechanisms are provided, and the two anti-shake driving mechanisms are respectively used to drive the two reflective elements to rotate relative to the light-guiding prism to change the angles between the two reflective surfaces and the first surface and the second surface.

11. The prism assembly according to claim 10, characterized in that: The light-guiding prism also includes a light-transmitting surface, and the light-entering area and the light-exiting area are formed on the light-transmitting surface. The light-guiding prism is configured to direct at least part of the light incident from the light-entering area to pass through the first surface to a reflecting surface opposite to the first surface, and to pass through the first surface to the light-transmitting surface after being reflected by the reflecting surface, thereby being reflected by the light-transmitting surface and passing through the second surface to the reflecting surface opposite to the second surface, and then being reflected by the reflecting surface and passing through the second surface to exit from the light-exiting area.

12. The prism assembly according to claim 11, characterized in that Under the adjustment of the anti-shake driving mechanism, the adjustable range of the angle between the two reflective surfaces and the light-transmitting surface is 25°-35°.

13. The prism assembly according to claim 12, wherein: The two anti-shake driving mechanisms can drive the two reflective elements to rotate synchronously relative to the light-guiding prism, and the angles between the two reflective surfaces and the light-transmitting surface are equal.

14. A camera module, characterized in that: It comprises a lens, an image sensor and a prism assembly as described in any one of claims 1 to 13, wherein the lens is opposite to the light incident area, and the image sensor is opposite to the light exit area.

15. The camera module according to claim 14, characterized in that: The camera module also includes a focus driving mechanism, which is used to drive the lens to move axially.

16. An electronic device, characterized in that: Comprising a camera module as described in claim 14 or 15.

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