Optical module driving device and electronic equipment

Abstract

The invention discloses an optical module driving device and electronic equipment, and relates to the technical field of optics, the optical module driving device comprises a piezoelectric ceramic component and an optical module, the piezoelectric ceramic component comprises a piezoelectric ceramic element and an elastic piece, and the piezoelectric ceramic element is fixed on the elastic piece and is electrically connected with an external circuit; the optical module is fixedly connected to the elastic piece, and the piezoelectric ceramic element can generate resonance work with the elastic piece under the driving action of an electric signal and drives the optical module to generate displacement; according to the technical scheme provided by the invention, the optical module can be promoted to generate the expected displacement value required for improving the optical effect along the expected direction, so that the aim of improving the optical effect is fulfilled.

Description

Technical Field

[0001] The present invention relates to the field of optical technologies, and particularly to an optical module driving device and an electronic device. Background Art

[0002] In an optical system, such as a projection system, a diffuser is usually adopted to mitigate the laser speckle phenomenon. Specifically, by changing vibration parameters of the diffuser itself, such as frequency, movement trajectory, and displacement, the laser experiences different phase changes and scattering during propagation, disrupting the formation rule of the speckle, thereby homogenizing the speckle and reducing its influence on the projection visual effect. For another example, in a camera system, the influence of jitter is offset by changing vibration parameters of the camera module, such as frequency, movement trajectory, and displacement, so as to achieve the effect of camera anti-shake. In the above systems, a moving coil structure is usually adopted to drive an optical module (such as a diffuser, a camera module) to generate displacement, that is, an electric current passes through a coil, generating a magnetic field around the coil, and this magnetic field interacts with a permanent magnet, causing the coil to move, and further driving a component (such as a diffuser, a camera module) connected thereto to generate displacement, vibration, etc. However, the displacement generated by driving with the moving coil structure is limited and cannot generate a large displacement, and thus cannot effectively improve the optical effect (such as the projection visual effect, the camera anti-shake effect). Summary of the Invention

[0003] The main object of the present invention is to propose an optical module driving device and an electronic device, aiming to enable the optical module to generate a large displacement, thereby improving the optical effect.

[0004] To achieve the above object, an optical module driving device proposed by the present invention includes:

[0005] A piezoelectric ceramic assembly, the piezoelectric ceramic assembly includes a piezoelectric ceramic element and an elastic member, the piezoelectric ceramic element is fixed on the elastic member and is electrically connected to an external circuit;

[0006] An optical module, the optical module is fixedly connected to the elastic member;

[0007] The piezoelectric ceramic element can resonate with the elastic member under the driving action of an electrical signal and drive the optical module to generate displacement.

[0008] In an embodiment, the optical module driving device further includes a fixing frame, the optical module is fixed to the fixing frame, and the elastic member is fixedly connected to the fixing frame.

[0009] In an embodiment, the elastic member includes a connected main body portion and a bent portion, one end of the main body portion far from the bent portion is fixedly connected to the fixing frame; the piezoelectric ceramic element is fixed on at least one surface of the main body portion and / or the bent portion.

[0010] In one embodiment, the elastic member is a sheet structure. The length of the main body portion is 1 mm - 1000 mm, the width of the main body portion is 1 mm - 500 mm, and the thickness of the main body portion is 0.1 mm - 50 mm. The length of the bent portion is 1 mm - 1000 mm, the width of the bent portion is 1 mm - 500 mm, and the thickness of the bent portion is 0.1 mm - 50 mm.

[0011] In one embodiment, the bent portion includes a first bent portion and a second bent portion connected to each other. One end of the first bent portion away from the second bent portion is connected to one end of the main body portion away from the fixing frame.

[0012] In one embodiment, the fixing frame is a square frame structure, and the elastic member is fixedly connected to the side portion or the bottom portion of the fixing frame; and / or, the elastic member has two ends, one end of the elastic member is connected to the fixing frame, and the other end is provided with a connecting portion for connecting an external structure.

[0013] In one embodiment, at least two elastic members are provided, and a piezoelectric ceramic element is fixed on each elastic member, and each elastic member is fixedly connected to the fixing frame.

[0014] In one embodiment, the piezoelectric ceramic element is a sheet structure. The length of the piezoelectric ceramic element is 1 mm - 500 mm, the width of the piezoelectric ceramic element is 1 mm - 500 mm, and the thickness of the piezoelectric ceramic element is 0.1 mm - 500 mm.

[0015] In one embodiment, the optical module is a diffusion sheet; or, the optical module is a camera module.

[0016] The present invention also provides an electronic device, and the electronic device includes the optical module driving device as described above.

[0017] The optical module driving device provided by the present invention includes a piezoelectric ceramic component and an optical module. The piezoelectric ceramic component includes a piezoelectric ceramic element and an elastic member. The piezoelectric ceramic element is fixed on the elastic member and is electrically connected to an external circuit; the optical module is fixedly connected to the elastic member. In the present invention, the piezoelectric ceramic element is fixedly connected to the elastic member. When an electrical signal is applied to the piezoelectric ceramic element through the external circuit, based on the inverse piezoelectric effect of the piezoelectric ceramic element, the piezoelectric ceramic element will generate corresponding vibrations and transmit the vibrations to the elastic member. When the driving frequency of the electrical signal is close to the natural frequency of the system formed by the piezoelectric ceramic element and the elastic member, the piezoelectric ceramic element and the elastic member resonate, and the vibration amplitude will be significantly enhanced, thereby causing the elastic member to vibrate greatly. Since the optical module is fixed on the elastic member, the vibration of the elastic member will be transmitted to the optical module, prompting the optical module to generate a precisely controllable and large displacement in the desired direction, and the generated displacement amount can reach the value required to improve the optical effect as expected, thereby achieving the purpose of improving the optical effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0019] Figure 1 It is a schematic structural diagram of the first embodiment of the optical module driving device provided by the present invention;

[0020] Figure 2 It is a schematic structural diagram of the second embodiment of the optical module driving device provided by the present invention;

[0021] Figure 3 It is a schematic structural diagram of the third embodiment of the optical module driving device provided by the present invention;

[0022] Figure 4 It is a schematic structural diagram of the fourth embodiment of the optical module driving device provided by the present invention;

[0023] Figure 5 It is a schematic structural diagram of the fifth embodiment of the optical module driving device provided by the present invention;

[0024] Figure 6 It is a schematic structural diagram of an embodiment of a fixing bracket in the optical module driving device provided by the present invention.

[0025] Explanation of the reference numerals in the drawings:

[0026] 100. Optical module driving device; 1. Fixing bracket; 1a. Bottom; 1b. Side; 11. Fixing position; 12. Mounting part; 2. Optical module; 3. Piezoelectric ceramic component; 31. Piezoelectric ceramic element; 32. Elastic member; 321. Main body part; 322. Bending part; 322a. Connecting part; 3221. First bending part; 3222. Second bending part.

[0027] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions such as "first" and "second" in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0031] In an optical system, such as a projection system, a diffuser is usually adopted to mitigate the laser speckle phenomenon. Specifically, by changing vibration parameters such as the frequency, movement trajectory, and displacement of the diffuser itself, the laser experiences different phase changes and scattering during propagation, disrupting the formation pattern of the speckles, thereby homogenizing the speckles and reducing their impact on the projection visual effect. Another example is in a camera system, where the impact of jitter is offset by changing vibration parameters such as the frequency, movement trajectory, and displacement of the camera module, thereby achieving the effect of camera anti-shake. In the above systems, a moving coil structure is usually adopted to drive the optical module (such as a diffuser, camera module) to generate displacement. That is, an electric current passes through the coil, generating a magnetic field around the coil. This magnetic field interacts with the permanent magnet, causing the coil to move, and then driving the components connected thereto (such as a diffuser, camera module) to generate displacement, vibration, etc. However, the displacement generated by driving with a moving coil structure is limited and cannot generate a large displacement, and thus cannot effectively improve the optical effect (such as the projection visual effect, camera anti-shake effect).

[0032] Piezoelectric ceramic materials simultaneously exhibit the direct piezoelectric effect and the inverse piezoelectric effect. Among them, the direct piezoelectric effect enables piezoelectric ceramic devices to sense strain and convert it into an electrical signal; the inverse piezoelectric effect enables piezoelectric ceramic devices to generate sound, vibration, and displacement under the drive of an electrical signal. Therefore, by utilizing the inverse piezoelectric effect of piezoelectric ceramic devices, a displacement much larger than that of the traditional moving coil structure can be generated under the drive of an electrical signal through structural design, and it is very suitable as a large-displacement device to replace the traditional moving coil structure.

[0033] In view of this, the present invention proposes an optical module driving device that combines an elastic ceramic element with an elastic member, realizes the generation of a large displacement through its resonant operation, and couples the optical module with the elastic member, so that the optical module generates a precisely controllable and large displacement along the desired direction, and the generated displacement amount can reach the value required to achieve the expected improvement of the optical effect, thereby achieving the purpose of improving the optical effect.

[0034] Please refer to Figure 1 , in an embodiment of the present invention, the optical module driving device 100 includes a piezoelectric ceramic assembly 3 and an optical module 2. The piezoelectric ceramic assembly 3 includes a piezoelectric ceramic element 31 and an elastic member 32. The piezoelectric ceramic element 31 is fixed on the elastic member 32 and is electrically connected to an external circuit; the optical module 2 is fixedly connected to the elastic member 32; the piezoelectric ceramic element 31 can resonate with the elastic member 32 under the drive of an electrical signal and drive the optical module 2 to generate displacement.

[0035] The piezoelectric ceramic element 31 can be optionally in a sheet structure, i.e., a piezoelectric ceramic sheet. Of course, other reasonable structures can also be selected. The piezoelectric ceramic includes piezoelectric ceramic layers and electrode layers arranged alternately in a stacked manner. Among them, the material of the piezoelectric ceramic layer can be a piezoelectric material, including but not limited to at least one of lead zirconate titanate, barium titanate, sodium potassium niobate, and aluminum nitride. Of course, materials that can generate telescopic vibration under the drive of an electrical signal can also be selected, such as electrostrictive materials, which are not limited herein. The thickness of a single piezoelectric ceramic layer is 10 μm - 2000 μm (such as 10 μm, 100 μm, 1000 μm, 2000 μm, and interval values between any two endpoint values). The material of the electrode layer is a conductive material, including but not limited to at least one of conductive metal materials (such as silver, gold, platinum, palladium) and conductive metal alloy materials. Of course, indium tin oxide conductive materials can also be selected, which are not limited herein. The thickness of a single piezoelectric electrode layer is 0.1 μm - 10 μm (such as 0.1 μm, 1 μm, 5 μm, 10 μm, and interval values between any two endpoint values).

[0036] On the surface of the piezoelectric ceramic element 31, lead-out electrodes connecting to the internal electrode layer are provided for electrical connection with an external circuit. Specifically, the electrical connection between the piezoelectric ceramic element 31 and the external circuit can be achieved through one of the connection methods of welding a lead wire, welding a flexible printed circuit board (FPC), and ACF (anisotropic conductive film) process. The above connection methods are all well-known connection methods in the art and will not be elaborated herein one by one.

[0037] The elastic member 32 can be in a sheet structure or other reasonable structures. The material of the elastic member 32 can be a metal material such as iron-nickel alloy, titanium alloy, stainless steel, or an elastic material such as engineering plastic, which is not limited herein. The elastic member 32 can be a split structure or an integral structure; the elastic member 32 can be a linear structure or a bent structure, which are not limited herein.

[0038] The piezoelectric ceramic part can be fixed on the elastic member 32 by glue bonding, or can also be fixed on the elastic member 32 by other hard contact methods (such as fixing with fasteners, welding and fixing, etc.), which are not limited herein. The piezoelectric ceramic part can be fixed on one surface of the elastic member 32, or can be fixed on both surfaces of the elastic member 32. Moreover, the piezoelectric ceramic part can be fixed on the entire surface of the elastic member 32 or can be fixed on a part of the surface of the elastic member 32, which are not limited herein.

[0039] The optical module 2 can be fixedly connected to the elastic member 32 by means of glue bonding. Of course, the fixed connection between the optical module 2 and the elastic member 32 can also be achieved through a fixing bracket, which is not limited herein. The optical module 2 includes, but is not limited to, a diffusion sheet and a camera module. In a laser projection system, the optical module 2 is a diffusion sheet, which is made of a material with scattering characteristics, such as optical plastics, glass, etc. By changing the vibration parameters of the diffusion sheet itself, such as frequency, movement trajectory, and displacement, the laser can experience different phase changes and scattering during propagation, disrupting the formation law of speckles, thereby homogenizing the speckles and achieving the purpose of improving the projection visual effect. In a camera system, the optical module 2 is a camera module, which is a well-known module in the art. By changing the vibration parameters of the camera module, such as frequency, movement trajectory, and displacement, the influence of camera shake can be offset, and the purpose of achieving camera anti-shake effect can be further realized.

[0040] A voltage is applied to the piezoelectric ceramic element 31 through an external circuit. When the applied voltage direction is the same as the polarization voltage direction of the piezoelectric ceramic element 31, the thickness direction of the piezoelectric ceramic element 31 thickens, and the length direction and width direction shorten. However, since the surface of the piezoelectric ceramic element 31 connected to the elastic member 32 cannot follow the shortening, a bending deformation occurs towards the surface of the piezoelectric ceramic element 31; when the applied voltage direction is opposite to the polarization voltage direction of the piezoelectric ceramic element 31, the thickness direction of the piezoelectric ceramic element 31 thins, and the length direction and width direction elongate. However, since the surface of the piezoelectric ceramic element 31 connected to the elastic member 32 cannot follow the elongation, a bending deformation occurs towards the surface of the elastic member 32. Based on this, by applying an alternating current signal, the piezoelectric ceramic assembly 3 can generate bending deformations in different directions, thereby causing the optical module 2 to generate displacements in different directions. At the same time, by applying a direct current signal, the piezoelectric ceramic assembly 3 can generate bending deformations of different degrees, thereby causing the optical module 2 to generate displacements of different magnitudes. Moreover, the greater the applied voltage, the greater the displacement finally generated by the optical module 2. Thus, through the above structural arrangement, it can be ensured that the optical module 2 generates the displacement value required to improve the optical effect in the desired direction, and the purpose of improving the optical effect is thereby achieved.

[0041] In the technical solution of the present invention, the piezoelectric ceramic element 31 is fixedly connected to the elastic member 32. When an electrical signal is applied to the piezoelectric ceramic element 31 through an external circuit, based on the inverse piezoelectric effect of the piezoelectric ceramic element 31, the piezoelectric ceramic element 31 will generate corresponding vibrations and transmit the vibrations to the elastic member 32. When the driving frequency of the electrical signal is close to the natural frequency of the system formed by the piezoelectric ceramic element 31 and the elastic member 32, the piezoelectric ceramic element 31 and the elastic member 32 resonate, and the vibration amplitude will be significantly enhanced, thereby causing the elastic member 32 to vibrate greatly. Since the optical module 2 is fixed on the elastic member 32, the vibration of the elastic member 32 will be transmitted to the optical module 2, prompting the optical module 2 to generate a precise, controllable and large displacement in the desired direction, and the generated displacement amount can reach the value required to improve the optical effect as expected, thereby achieving the purpose of improving the optical effect.

[0042] In some embodiments of the present invention, the optical module driving device 100 further includes a fixing bracket 1. The optical module 2 is fixed to the fixing bracket 1, and the elastic member 32 is fixedly connected to the fixing bracket 1.

[0043] In the embodiments of the present invention, the fixing bracket 1 provides a stable installation platform for the optical module 2, and can provide more stable boundary conditions for the resonant operation of the piezoelectric ceramic element 31 and the elastic member 32, realizing more precise resonance control, and further more precisely driving the optical module 2 to generate the required displacement to achieve the purpose of improving the optical effect. At the same time, during the resonant operation, the piezoelectric ceramic element 31 and the elastic member 32 will bear periodic stress and strain. As a buffer and support structure, the fixing bracket 1 can share part of the stress, make the stress distribution uniform, reduce the stress concentration at the connecting part 322a between the elastic member 32 and the optical module 2, and improve the reliability and durability of the entire device. In addition, the setting of the fixing bracket 1 also facilitates the replacement or adjustment operation of the elastic member 32 and the optical module 2.

[0044] The material of the fixing bracket 1 can be metal materials such as iron-nickel alloy, titanium alloy, stainless steel, or engineering plastics. The fixing bracket 1 can be a split structure or an integral structure, which is not limited herein. The optical module 2 can be fixed to the fixing bracket 1 by means of snap connection, bonding or other reasonable methods, and its specific fixing method is not limited. The connection method between the optical module 2 and the elastic member 32 can be glue bonding, connection by fasteners (such as screws), welding or other reasonable connection methods.

[0045] Please refer to Figure 1 and Figure 6, in a specific embodiment of the present invention, the fixing frame 1 is a square structure, including a bottom portion 1a and side portions 1b surrounding the edge of the bottom portion 1a. A fixing position 11 is formed in the middle of the bottom portion 1a. Specifically, a through hole is opened in the middle of the bottom portion 1a, and a limiting portion is provided on the hole wall of the through hole. The extending direction of the limiting portion is the same as that of the side portions 1b. Optionally, the through hole is an octagonal hole, and the limiting portions are provided in four numbers. The four limiting portions are spaced and evenly distributed, and the four limiting portions together enclose to form the fixing position 11. The optical module 2 is snap-fitted and fixed within the fixing position 11. The fixing method in this embodiment is simple in setting and relatively firm in fixing.

[0046] Please refer to Figures 1 to 3 , in some embodiments of the present invention, the elastic member 32 includes a main body portion 321 and a bent portion 322 connected to each other. One end of the main body portion 321 away from the bent portion 322 is fixedly connected to the fixing frame 1; the piezoelectric ceramic element 31 is fixed on at least one surface of the main body portion 321 and / or the bent portion 322.

[0047] The main body portion 321 and the bent portion 322 can be an integral structure, and can be specifically made by means well-known in the art such as stamping, CNC, injection molding, etc. Thereby, the firmness of the whole elastic member 32 can be ensured, and thus the stability of the displacement generated by the whole device can be ensured. The piezoelectric ceramic element 31 can be fixed on one surface or two surfaces of the main body portion 321, or can be fixed on one surface or two surfaces of the bent portion 322. Of course, the piezoelectric ceramic element 31 can be simultaneously fixed on two surfaces of the main body portion 321 and the bent portion 322, and its specific setting is not limited herein.

[0048] In the embodiment of the present invention, the elastic member 32 is set as a bent structure. Among them, the bent portion 322 increases the flexibility and deformation freedom degree of the elastic member 32, so that the elastic member 32 can adapt to a wider frequency range to a certain extent, broadens the resonance bandwidth, and thus can ensure that the optical module 2 stably generates displacement, improving the stability and adaptability of the whole device. And when the piezoelectric ceramic element 31 drives the elastic member 32 to resonate, the bent portion 322 can generate a greater elastic deformation, and further enables the optical module 2 to generate a greater displacement amount, which is beneficial to more significantly improving the optical effect. At the same time, the bent portion 322 can also relieve the stress during the resonance process, improve the reliability and service life of the elastic member 32, and further improve the stability and durability of the whole device. In addition, the design of the bent portion 322 can enable the elastic member 32 to better adapt to the complex spatial layout, and is very suitable for miniaturized electronic devices.

[0049] In some embodiments of the present invention, the elastic member 32 has a sheet-like structure. The length of the main body portion 321 is 1 mm - 1000 mm (such as 1 mm, 10 mm, 100 mm, 1000 mm, and interval values between any two endpoint values), the width of the main body portion 321 is 1 mm - 500 mm (such as 1 mm, 10 mm, 100 mm, 500 mm, and interval values between any two endpoint values), and the thickness of the main body portion 321 is 0.1 mm - 50 mm (such as 0.1 mm, 1 mm, 10 mm, 50 mm, and interval values between any two endpoint values); the length of the bending portion 322 is 1 mm - 1000 mm (such as 1 mm, 10 mm, 100 mm, 1000 mm, and interval values between any two endpoint values), the width of the bending portion 322 is 1 mm - 500 mm (such as 1 mm, 10 mm, 100 mm, 500 mm, and interval values between any two endpoint values), and the thickness of the bending portion 322 is 0.1 mm - 50 mm (such as 0.1 mm, 1 mm, 10 mm, 50 mm, and interval values between any two endpoint values).

[0050] In the embodiments of the present invention, the resonant working frequency of the piezoelectric ceramic element 31 and the elastic member 32 can be changed by changing the specific dimensions of the elastic member 32. Furthermore, the working frequency range of the entire device can be expanded, and the displacement range, movement trajectory, and direction of the entire device can be controlled. Thus, different optical modules 2 can be adapted to cause the optical module 2 to generate the displacement value required for improving the optical effect in the desired direction, thereby achieving the purpose of improving the optical effect.

[0051] It should be noted that increasing the length, width, and thickness of the elastic member 32 and the bending portion 322 can reduce the resonant working frequency of the piezoelectric ceramic element 31 and the elastic member 32; conversely, it can increase the resonant working frequency of the piezoelectric ceramic element 31 and the elastic member 32. Therefore, different optical modules 2 can be adapted according to this to cause the optical module 2 to generate the value required for improving the optical effect in the desired direction, thereby achieving the purpose of improving the optical effect.

[0052] Please refer to Figure 4 and Figure 5 , in some embodiments of the present invention, the bending portion 322 includes a first bending portion 3221 and a second bending portion 3222 connected to each other. One end of the first bending portion 3221 far from the second bending portion 3222 is connected to one end of the main body portion 321 far from the fixing bracket 1.

[0053] In the embodiments of the present invention, setting two bending portions 322 can more effectively improve the stability, adaptability, and durability of the entire device. At the same time, it is more suitable for miniaturized electronic devices.

[0054] Of course, in some other embodiments, the bending portion 322 may be provided with more than two according to the specific shape of the fixing frame 1.

[0055] In some embodiments of the present invention, the fixing frame 1 is a square frame structure, and the elastic member 32 is fixedly connected to the side portion 1b or the bottom portion 1a of the fixing frame 1.

[0056] Please refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 , in some embodiments of the present invention, one end of the elastic member 32 is fixedly connected to the side portion 1b of the fixing frame 1. Specifically, an installation portion 12 is formed on the side wall of the fixing frame 1, and one end of the main body portion 321 away from the bending portion 322 is fixedly connected to the installation portion 12. The fixing method may be bonding, welding, fixing with fasteners or other reasonable fixing methods, which are not limited herein.

[0057] Please refer to Figure 3 , one end of the elastic member 32 is fixedly connected to the bottom portion 1a of the fixing frame 1. Specifically, one end of the main body portion 321 away from the bending portion 322 is fixedly connected to the bottom portion 1a of the fixing frame 1. The fixing method may be bonding, welding, fixing with fasteners or other reasonable fixing methods, which are not limited herein.

[0058] It should be noted that the fixing position 11 of the elastic member 32 and the fixing frame 1 may not be limited. Please refer to Figure 5 again, the elastic member 32 may be fixed at the edge position of the side portion 1b of the fixing frame 1 or at the middle position of the side portion 1b of the fixing frame 1.

[0059] In the embodiments of the present invention, the resonant working frequency of the piezoelectric ceramic element 31 and the elastic member 32 can be changed by changing the fixed connection position of the elastic member 32 and the fixing frame 1. Furthermore, the working frequency range of the entire device can be expanded, and the displacement range, movement trajectory and direction of the entire device can be controlled. Thus, different optical modules 2 can be adapted to cause the optical module 2 to generate the values required for improving the optical effect in the desired direction, thereby achieving the purpose of improving the optical effect.

[0060] It should be noted that when the connection position of the elastic member 32 and the fixing bracket 1 is close to the edge of the fixing bracket 1, the effective vibration length of the elastic member 32 increases. Under the action of the same driving force, the deformation amount of the elastic sheet will increase, thereby driving the fixing bracket 1 and the optical module 2 to generate a larger displacement, and the working displacement range is expanded. When the connection position of the elastic member 32 and the fixing bracket 1 is close to the center of the fixing bracket 1, the effective vibration length of the elastic member 32 decreases. Under the action of the same driving force, the deformation amount of the elastic sheet will decrease, thereby driving the fixing bracket 1 and the optical module 2 to generate a smaller displacement, and the working displacement range is smaller. Therefore, different optical modules 2 can be adapted according to this to prompt the optical module 2 to generate the displacement value required for expected improvement of the optical effect in the desired direction, thereby achieving the purpose of improving the optical effect.

[0061] Please refer to Figures 1 to 5 , in some embodiments of the present invention, the elastic member 32 has two ends, one end of the elastic member 32 is connected to the fixing bracket 1, and the other end is provided with a connecting portion 322a for connecting to an external structure.

[0062] In the embodiments of the present invention, one end of the elastic member 32 is fixed to an external structure (i.e., other structures of the electronic device), and the other end is connected to the fixing bracket 1. Thus, the vibration generated by the piezoelectric ceramic element 31 and the elastic member 32 during resonance operation can be effectively transmitted to the fixing bracket 1 and the optical module 2, and at the same time, this setting facilitates the installation and positioning of the elastic member 32.

[0063] Please refer to again Figures 1 to 5 , in a specific embodiment of the present invention, the connecting portion 322a is provided with connecting holes, which can be selected as two. The external structure is correspondingly provided with two mating holes, and the connection between the connecting portion 322a and the external structure is realized through the cooperation of fasteners (which can be screws) with the connecting holes and the mating holes. Of course, in some other embodiments, other reasonable connection methods can also be used to realize the connection between the connecting portion 322a and the external structure.

[0064] In some embodiments of the present invention, both the piezoelectric ceramic element 31 and the elastic member 32 are sheet-like structures. The piezoelectric ceramic element 31 can be fixed on a part of the surface or the entire surface of the elastic member 32, that is, the surface of the piezoelectric ceramic element 31 is in contact with the elastic member 32. Thus, it can be ensured that the vibration of the piezoelectric ceramic element 31 is more effectively transmitted to the elastic member 32, and the phenomenon of disconnection is not likely to occur. If a part of the surface of the piezoelectric ceramic element 31 is not in contact with the elastic member 32, or the piezoelectric ceramic element 31 is directly connected to the fixing bracket 1 (or the optical module 2), the phenomenon of disconnection will occur when the piezoelectric ceramic element 31 generates a large-amplitude vibration, and thus the vibration cannot be effectively transmitted to the fixing bracket 1 (or the optical module 2).

[0065] Please refer to again Figures 1 to 5, in some embodiments of the present invention, the elastic members 32 are provided as at least two, and a piezoelectric ceramic element 31 is fixed on each elastic member 32, and each elastic member 32 is fixedly connected to the fixing frame 1.

[0066] In the embodiments of the present invention, the elastic members 32 are provided as at least two, which can provide greater elastic force and displacement transmission ability, and can transmit displacement to the fixing frame 1 and the optical module 2 from different positions, which is beneficial to providing the stability and balance of the entire device, and further effectively ensuring that the optical module 2 generates the displacement value required for dissipating laser speckles as expected in the desired direction and trajectory, thereby achieving the purpose of significantly improving the projection visual effect.

[0067] It should be noted that among the two elastic members 32, the specific number, size and arrangement of the piezoelectric ceramic elements 31 can be the same or different; the shapes and sizes of the two elastic members 32 can be the same or different; the connection positions of the two elastic members 32 to the fixing frame 1 can be symmetrically arranged or not symmetrically arranged. No limitation is made here, and specific adjustments can be made according to design requirements.

[0068] In some embodiments of the present invention, the piezoelectric ceramic element 31 is a sheet structure, the length of the piezoelectric ceramic element 31 is 1 mm - 500 mm (such as 1 mm, 10 mm, 100 mm, 500 mm and the interval values between any two end points), the width of the piezoelectric ceramic element 31 is 1 mm - 500 mm (such as 1 mm, 10 mm, 100 mm, 500 mm and the interval values between any two end points), and the thickness of the piezoelectric ceramic element 31 is 0.1 mm - 500 mm (such as 0.1 mm, 1 mm, 10 mm, 100 mm, 500 mm and the interval values between any two end points).

[0069] In the embodiments of the present invention, the resonant working frequency of the piezoelectric ceramic element 31 and the elastic member 32 can be changed by changing the size of the piezoelectric ceramic element 31, and further the working frequency range of the entire device can be expanded, and the displacement range, movement trajectory and direction of the entire device can be controlled, so as to adapt to different optical modules 2, so as to promote the optical module 2 to generate the displacement value required for improving the optical effect as expected in the desired direction, thereby achieving the purpose of improving the optical effect.

[0070] It should be noted that increasing the length, width and thickness of the piezoelectric ceramic element 31 can reduce the resonant working frequency of the piezoelectric ceramic element 31 and the elastic member 32; on the contrary, it can increase the resonant working frequency of the piezoelectric ceramic element 31 and the elastic member 32. Thus, different optical modules 2 can be adapted according to this, so as to promote the optical module 2 to generate the displacement value required for improving the optical effect as expected in the desired direction, thereby achieving the purpose of improving the optical effect.

[0071] In some embodiments of the present invention, the optical module 2 is a diffusion sheet, which is applied to a laser projection system. The optical module driving device 100 is a laser speckle reduction device. The optical module driving device 100 further includes a laser light source. The laser light source includes a laser that emits a laser beam. The diffusion sheet is located on the outgoing light path of the laser beam. Since the diffusion sheet is fixed on the elastic member 32, the vibration generated by the piezoelectric ceramic element 31 and the elastic member 32 during resonant operation will be transmitted to the diffusion sheet, prompting the diffusion sheet to generate a displacement value required for expected laser speckle reduction in the desired direction, thereby achieving the purpose of improving the projection visual effect.

[0072] In some embodiments of the present invention, the optical module 2 is a camera module, which is applied to a camera system. The optical module driving device 100 is an anti-shake device for the camera. Since the camera module is fixed on the elastic member 32, the vibration generated by the piezoelectric ceramic element 31 and the elastic member 32 during resonant operation will be transmitted to the camera module, prompting the camera module to generate a displacement value required for expected cancellation of camera shake in the desired direction, thereby achieving the purpose of improving the anti-shake effect of the camera.

[0073] The present invention also proposes an electronic device, which includes the optical module driving device 100. The specific structure of the optical module driving device 100 refers to the above embodiments. Since this electronic device adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, the electronic device includes but is not limited to cameras, mobile phones, projectors, etc.

[0074] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An optical module driving device, characterized in that: The optical module driving device comprises: A piezoelectric ceramic assembly, the piezoelectric ceramic assembly comprising a piezoelectric ceramic element and an elastic member, the piezoelectric ceramic element being fixed on the elastic member and electrically connected to an external circuit; An optical module, wherein the optical module is fixedly connected to the elastic member; The piezoelectric ceramic element can resonate with the elastic member under the driving action of an electrical signal and drive the optical module to generate displacement.

2. The optical module driving device according to claim 1, wherein: The optical module driving device further comprises a fixing frame, the optical module is fixed to the fixing frame, and the elastic member is fixedly connected to the fixing frame.

3. The optical module driving device according to claim 2, characterized in that: The elastic member comprises a main body portion and a bent portion connected to each other, and one end of the main body portion away from the bent portion is fixedly connected to the fixing frame; The piezoelectric ceramic element is fixed on at least one surface of the main body and / or the bent portion.

4. The optical module driving device according to claim 3, characterized in that: The elastic member is a sheet-like structure, the length of the main body is 1mm-1000mm, the width of the main body is 1mm-500mm, and the thickness of the main body is 0.1mm-50mm; The length of the bending portion is 1mm-1000mm, the width of the bending portion is 1mm-500mm, and the thickness of the bending portion is 0.1mm-50mm.

5. The optical module driving device according to claim 3, characterized in that: The bending portion includes a first bending portion and a second bending portion connected to each other, and an end of the first bending portion away from the second bending portion is connected to an end of the main body away from the fixing frame.

6. The optical module driving device according to claim 2, wherein: The fixing frame is a square frame structure, and the elastic member is fixedly connected to the side or bottom of the fixing frame; and / or, The elastic member has two ends, one end of the elastic member is connected to the fixing frame, and the other end is provided with a connecting portion, and the connecting portion is used to connect to an external structure.

7. The optical module driving device according to claim 2, wherein: The number of the elastic members is at least two, the piezoelectric ceramic element is fixed on each of the elastic members, and each of the elastic members is fixedly connected to the fixing frame.

8. The optical module driving device according to claim 1, wherein: The piezoelectric ceramic element is a sheet-like structure, the length of the piezoelectric ceramic element is 1 mm-500 mm, the width of the piezoelectric ceramic element is 1 mm-500 mm, and the thickness of the piezoelectric ceramic element is 0.1 mm-500 mm.

9. The optical module driving device according to any one of claims 1 to 8, characterized in that: The optical module is a diffuser; or, The optical module is a camera module.

10. An electronic device, characterized in that: The electronic device comprises the optical module driving device according to any one of claims 1 to 9.

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