Piezoelectric ceramic actuator driving motor, camera module and terminal equipment

Abstract

The utility model relates to a piezoelectric ceramic actuator driving motor, a camera module and terminal equipment. The piezoelectric ceramic actuator driving motor comprises a motor shell; the base is arranged in the motor shell; an AF carrier which is provided on the inner side of the base and is movable in the vertical direction with respect to the base; the friction plate is fixedly arranged on the outer side wall of the AF carrier; a piezoelectric ceramic actuator; a partial pressure block; an elastic sheet; wherein the base is provided with a containing groove, the elastic piece, the partial pressure block and the piezoelectric ceramic actuator are sequentially arranged in the containing groove, and the elastic piece exerts pre-compression force on the piezoelectric ceramic actuator through the partial pressure block, so that the piezoelectric ceramic actuator is tightly matched with the friction plate. The utility model has the advantages of anti-interference capability, large stroke, high precision, compact structure and efficient and stable power transmission.

Description

Technical Field

[0001] This utility model relates to the field of camera module technology, specifically to a piezoelectric ceramic actuator drive motor, camera module, and terminal equipment. Background Technology

[0002] Traditional camera modules typically use voice coil motors to drive lens movement for autofocus (AF) and optical image stabilization (OIS). However, voice coil motors rely on magnetic fields for operation and are susceptible to interference from surrounding magnetic materials, leading to decreased focusing accuracy and unstable image stabilization. Furthermore, the physical characteristics of electromagnetic drives limit their travel range, making it difficult to meet the demands of complex shooting scenarios such as wide-angle and telephoto lenses.

[0003] Piezoelectric motors, as an emerging technology, are based on the inverse piezoelectric effect of piezoelectric materials. They generate driving force by controlling the deformation of the material through electrical signals, thus eliminating dependence on magnetic fields. Compared to electromagnetic drives, piezoelectric motors have advantages such as low power consumption, high response speed, and micro-nano-level precision, providing a new direction for the development of camera modules. However, there is still room for improvement in the structural design and material application of existing piezoelectric motor technology to further enhance its stability and accuracy.

[0004] Therefore, it is necessary to develop a new piezoelectric ceramic actuator to drive motors, camera modules, and terminal equipment. Utility Model Content

[0005] The purpose of this utility model is to provide a piezoelectric ceramic actuator drive motor, camera module and terminal equipment, which have anti-interference ability, large stroke, high precision, compact structure and efficient and stable power transmission.

[0006] In a first aspect, the piezoelectric ceramic actuator drive motor of this utility model includes:

[0007] Motor housing;

[0008] The base is disposed inside the motor housing;

[0009] The AF carrier is disposed inside the base and is movable relative to the base in the vertical direction;

[0010] Friction pads are fixed to the outer side wall of the AF carrier;

[0011] Piezoelectric ceramic actuator;

[0012] Pressure divider block;

[0013] shrapnel;

[0014] The base has a receiving groove, and the spring, pressure dividing block and piezoelectric ceramic actuator are sequentially arranged in the receiving groove. The spring applies a pre-pressure to the piezoelectric ceramic actuator through the pressure dividing block, so that the piezoelectric ceramic actuator and the friction plate are tightly engaged.

[0015] Optionally, the spring sheet has an outward protrusion in the middle, the protrusion abuts against the base, and the two ends of the spring sheet abut against the two ends of the pressure dividing block;

[0016] The outer end of the piezoelectric ceramic actuator abuts against the pressure dividing block, and the inner end of the piezoelectric ceramic actuator abuts against the friction plate. The spring plate has an outward protrusion in the middle that abuts against the base; this structure enhances the stability and elasticity of the spring plate, providing better preload. The two ends of the spring plate abut against the two ends of the pressure dividing block, ensuring that the spring force is evenly transmitted to the pressure dividing block, and thus evenly applied to the piezoelectric ceramic actuator, guaranteeing uniform force distribution across all parts of the actuator and improving its performance and lifespan. The two ends of the piezoelectric ceramic actuator abut against the pressure dividing block and the friction plate respectively, ensuring the continuity and stability of power transmission, allowing the driving force generated by the piezoelectric ceramic actuator to be effectively transmitted to the friction plate, propelling the AF carrier.

[0017] Optionally, the pressure divider block and the piezoelectric ceramic actuator are fixed together by dispensing adhesive.

[0018] Optionally, it includes:

[0019] A limiting cover is fixedly installed directly above the spring, pressure dividing block, and piezoelectric ceramic actuator. The limiting cover effectively restricts the vertical movement of the spring, pressure dividing block, and piezoelectric ceramic actuator during operation, ensuring the positional stability of these components. Positional stability avoids problems such as changes in preload and interruption of power transmission caused by component movement, thereby improving the motor's working accuracy and reliability.

[0020] Optionally, a first positioning groove is provided on the side of the pressure dividing block that contacts the piezoelectric ceramic actuator;

[0021] A second positioning groove is provided at a position on the base corresponding to the first positioning groove;

[0022] The outer end of the piezoelectric ceramic actuator is located within the first positioning groove, and the inner end of the piezoelectric ceramic actuator passes through the second positioning groove and abuts against the friction plate. The first and second positioning grooves serve to position and limit the piezoelectric ceramic actuator. This structure ensures that the piezoelectric ceramic actuator's position is fixed in the left-right direction, preventing lateral displacement during operation. Accurate positioning ensures a good fit between the piezoelectric ceramic actuator and the friction plate, making power transmission more precise, improving the motor's working accuracy and stability, and reducing performance degradation and malfunctions caused by positional deviations of the piezoelectric ceramic actuator.

[0023] Optionally, a guide groove is provided on the base;

[0024] The AF carrier is provided with a guide block;

[0025] The guide block is located within the guide groove. The cooperation between the guide groove and the guide block provides precise guidance for the vertical movement of the AF carrier. The movement of the guide block within the guide groove restricts the AF carrier's degrees of freedom in directions other than vertical, ensuring that the AF carrier can only move stably along the predetermined vertical direction. This guiding structure improves the accuracy and stability of the AF carrier's movement, reduces swaying and deviations during movement, thereby improving the overall performance and reliability of the motor and ensuring that the motor accurately achieves the intended motion function.

[0026] Secondly, the camera module described in this utility model uses a piezoelectric ceramic actuator to drive the motor as described in this utility model.

[0027] Thirdly, the terminal device described in this utility model employs the camera module described in this utility model.

[0028] The beneficial effects of this utility model are:

[0029] (1) Strong anti-interference ability: This utility model uses a piezoelectric ceramic actuator as a power source, which gets rid of the dependence on magnetic field and fundamentally avoids the problems of decreased focusing accuracy and unstable anti-shake effect caused by interference from surrounding magnetic materials. It can work stably in various complex environments, provide reliable power support for the camera module, and ensure the clarity and stability of the captured image.

[0030] (2) Large stroke and high precision: Piezoelectric ceramic actuators generate driving force using the piezoelectric effect. Compared with electromagnetic drives, their physical characteristics allow for a larger stroke range, which can better meet the needs of lens movement in complex shooting scenarios such as wide-angle and telephoto. At the same time, piezoelectric ceramic actuators have micro-nano-level precision, which can achieve precise displacement control, ensuring that the lens can quickly and accurately reach the designated position, greatly improving the performance of autofocus.

[0031] (3) Compact structure and efficient and stable power transmission: By setting a receiving groove on the base, the positions of the spring, pressure dividing block and piezoelectric ceramic actuator are reasonably arranged, making the entire motor structure more compact and saving space. The spring applies pre-pressure to the piezoelectric ceramic actuator through the pressure dividing block, ensuring that the piezoelectric ceramic actuator and the friction plate are tightly matched. This tight matching can ensure the efficiency and stability of power transmission, reduce energy loss in the transmission process, improve the working performance and reliability of the motor, and further improve the focusing speed and accuracy of the camera module.

[0032] In summary, the piezoelectric ceramic actuator drive motor, camera module, and terminal equipment of this invention have significant advantages in terms of anti-interference capability, stroke range, accuracy, structural compactness, and power transmission efficiency. They can effectively solve the problems existing in traditional voice coil motors and existing piezoelectric motor technologies, and provide a better solution for the development of camera modules and terminal equipment. Attached Figure Description

[0033] Figure 1 This is one of the analytical diagrams of the piezoelectric ceramic actuator driving motor described in the embodiments of this application;

[0034] Figure 2 This is a top view of the piezoelectric ceramic actuator driving motor described in the embodiments of this application;

[0035] Figure 3 This is a cross-sectional view of the piezoelectric ceramic actuator driving motor described in the embodiments of this application;

[0036] Figure 4 This is the second analytical diagram of the piezoelectric ceramic actuator driving motor described in the embodiments of this application;

[0037] In the figure: 1. Motor housing, 2. Piezoelectric ceramic actuator, 3. Limit cover, 4. AF carrier, 5. Base, 6. Friction plate, 7. Pressure dividing block, 8. Spring, 9. Guide groove, 10. Guide block, 11. Receiving groove, 12. First positioning groove, 13. Second positioning groove. Detailed Implementation

[0038] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0039] like Figures 1 to 4 As shown in this embodiment, a piezoelectric ceramic actuator-driven motor includes a motor housing 1, a base 5, an AF carrier 4, a piezoelectric ceramic actuator 2, a friction plate 6, a pressure dividing block 7, and a spring 8. The base 5 is disposed inside the motor housing 1. The AF carrier 4 is disposed inside the base 5 and can move vertically relative to the base 5. The friction plate 6 is fixed to the outer side wall of the AF carrier 4. A receiving groove 11 is provided on the base 5, and the spring 8, the pressure dividing block 7, and the piezoelectric ceramic actuator 2 are sequentially disposed in the mounting groove from the outside to the inside, and the pressure dividing block 7 and the piezoelectric ceramic actuator 2 are fixed together by adhesive dispensing. The spring 8 has an outward protrusion in the middle, which abuts against the base 5, and both ends of the spring 8 abut against the two ends of the pressure dividing block 7. The outer end of the piezoelectric ceramic actuator 2 is pressed against the pressure dividing block 7, and the inner end of the piezoelectric ceramic actuator 2 is pressed against the friction plate 6; the spring plate 8 provides pre-pressure to the piezoelectric ceramic actuator 2, so that the piezoelectric ceramic actuator 2 and the friction plate 6 are tightly fitted. The spring force generated by the spring is evenly applied to the piezoelectric ceramic actuator 2 through the pressure dividing block 7.

[0040] When an electrical signal is applied to the piezoelectric ceramic actuator 2, it generates high-frequency vibrations based on the inverse piezoelectric effect. This vibration effectively drives the friction plate 6 and the AF carrier 4 to work together, achieving precise up-and-down movement, thus enabling the motor to respond quickly and with high positioning accuracy. Most importantly, this structure eliminates the traditional magnetic field drive method, completely eliminating the adverse effects of magnetic field interference on motor performance. Furthermore, freed from the physical constraints of electromagnetic drive, the motor's stroke is no longer limited, easily handling diverse and complex shooting scenarios such as wide-angle and telephoto shots, bringing unprecedented flexibility and adaptability to video technology.

[0041] like Figure 3As shown, in one possible embodiment, a limiting cover 3 is also provided directly above the spring 8, the pressure dividing block 7, and the piezoelectric ceramic actuator 2. The limiting cover 3 is fixed to the base 5 with adhesive. The setting of the limiting cover 3 effectively restricts the vertical movement of the spring 8, the pressure dividing block 7, and the piezoelectric ceramic actuator 2 during operation, ensuring the positional stability of these components during operation. Positional stability can avoid problems such as changes in pre-pressure and interruption of power transmission caused by component movement, thereby improving the working accuracy and reliability of the motor.

[0042] like Figure 4 As shown, in one possible embodiment, a first positioning groove 12 is provided on the surface of the pressure block 7 that contacts the piezoelectric ceramic actuator 2, and a second positioning groove 13 is provided on the base 5 at a position corresponding to the first positioning groove 12. The outer end of the piezoelectric ceramic actuator 2 is located in the first positioning groove 12, and the inner end of the piezoelectric ceramic actuator 2 passes through the second positioning groove 13 and abuts against the friction plate 6. The arrangement of the first positioning groove 12 and the second positioning groove 13 serves to position and limit the piezoelectric ceramic actuator 2. With the outer end of the piezoelectric ceramic actuator 2 located in the first positioning groove and the inner end passing through the second positioning groove 13 and abutting against the friction plate 6, this structure ensures that the position of the piezoelectric ceramic actuator 2 is fixed in the left-right direction, preventing it from shifting left or right during operation. Accurate positioning ensures a good fit between the piezoelectric ceramic actuator 2 and the friction plate 6, making power transmission more precise, improving the working accuracy and stability of the motor, and reducing performance degradation and malfunctions caused by positional deviation of the piezoelectric ceramic actuator 2.

[0043] like Figure 4 As shown, in one possible embodiment, a guide groove 9 is provided on the base 5, and a guide block 10 is provided on the AF carrier 4, with the guide block 10 located within the guide groove 9. The cooperation between the guide groove 9 and the guide block 10 provides precise guidance for the vertical movement of the AF carrier 4. The guide block 10 moves within the guide groove 9, restricting the degrees of freedom of the AF carrier 4 in directions other than vertical, ensuring that the AF carrier 4 can only move stably along the predetermined vertical direction. This guiding structure can improve the accuracy and stability of the AF carrier 4's movement, reduce swaying and deviation during movement, thereby improving the overall performance and reliability of the motor, and ensuring that the motor can accurately achieve the expected motion function.

[0044] In this embodiment of the application, a camera module uses a piezoelectric ceramic actuator to drive a motor, as described in this embodiment of the application.

[0045] In this application embodiment, a terminal device employs a camera module as described in this application embodiment.

[0046] This is a preferred embodiment of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A piezoelectric ceramic actuator drive motor, characterized in that, include: Motor housing (1); The base (5) is disposed inside the motor housing (1); AF carrier (4) is disposed on the inner side of the base (5) and is able to move in the vertical direction relative to the base (5); Friction pad (6) is fixed on the outer side wall of the AF carrier (4); Piezoelectric ceramic actuator (2); Pressure divider block (7); Shrapnel (8); The base (5) is provided with a receiving groove (11), and the spring (8), pressure dividing block (7) and piezoelectric ceramic actuator (2) are arranged in sequence in the receiving groove (11). The spring (8) applies pre-pressure to the piezoelectric ceramic actuator (2) through the pressure dividing block (7) so that the piezoelectric ceramic actuator (2) and the friction plate (6) are closely matched.

2. The piezoelectric ceramic actuator drive motor according to claim 1, characterized in that: The spring piece (8) has an outward protrusion in the middle, the protrusion abuts against the base (5), and the two ends of the spring piece (8) abut against the two ends of the pressure dividing block (7); The outer end of the piezoelectric ceramic actuator (2) abuts against the pressure dividing block (7), and the inner end of the piezoelectric ceramic actuator (2) abuts against the friction plate (6).

3. The piezoelectric ceramic actuator drive motor according to claim 1, characterized in that: The pressure divider block (7) and the piezoelectric ceramic actuator (2) are fixed together by dispensing adhesive.

4. The piezoelectric ceramic actuator drive motor according to claim 1, characterized in that, Also includes: The limiting cover (3) is fixedly disposed directly above the spring (8), the pressure dividing block (7) and the piezoelectric ceramic actuator (2).

5. The piezoelectric ceramic actuator drive motor according to claim 1, characterized in that: A first positioning groove (12) is provided on the side of the pressure dividing block (7) that contacts the piezoelectric ceramic actuator (2); A second positioning groove (13) is provided at the position corresponding to the first positioning groove (12) on the base (5); The outer end of the piezoelectric ceramic actuator (2) is located in the first positioning groove (12), and the inner end of the piezoelectric ceramic actuator (2) passes through the second positioning groove (13) and abuts against the friction plate (6).

6. The piezoelectric ceramic actuator drive motor according to claim 1, characterized in that: A guide groove (9) is provided on the base (5); A guide block (10) is provided on the AF carrier (4); The guide block (10) is located in the guide groove (9) to ensure the stability of the AF carrier (4) during operation.

7. A camera module, characterized in that, The motor is driven by a piezoelectric ceramic actuator as described in any one of claims 1 to 6.

8. A terminal device, characterized in that, The camera module as described in claim 7 is used.

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