Piezoelectric motor, camera module and electronic equipment

Abstract

The utility model relates to a piezoelectric motor, a camera module and an electronic device. The piezoelectric motor comprises a housing; the motor base is connected with the shell in a matched manner; the motor carrier is arranged on the motor base and is used for bearing a lens; the piezoelectric ceramic element is arranged on the outer side of the motor carrier and used for generating deformation based on the inverse piezoelectric effect when voltage is applied; the spring is arranged between the piezoelectric ceramic element and the shell and used for enabling the piezoelectric ceramic element to be tightly attached to the motor carrier and transmitting deformation force so as to drive the motor carrier to move up and down; and the FPC circuit board is connected with the piezoelectric ceramic element and is used for supplying power to the piezoelectric ceramic element and controlling the piezoelectric ceramic element to work. According to the utility model, the advantages of cost effectiveness and quick response of the VCM motor can be maintained, the positioning precision can be obviously improved, the driving force and the stroke are increased, and the jitter of the lens can be effectively inhibited.

Description

TECHNICAL FIELD

[0001] The utility model relates to camera module technical field, concretely relates to a piezoelectric motor, camera module and electronic equipment. BACKGROUND

[0002] With the rapid development of mobile communication technology and the continuous improvement of smart phone penetration rate, mobile phone camera module has become one of the indispensable key components in modern smart phones. Users' demand for mobile phone shooting function is increasingly diversified, not only requiring high-definition image quality and rich color expression, but also pursuing fast and accurate focusing ability, smooth zoom effect and stable image capture performance.

[0003] Among many camera module technologies, voice coil motor (VCM) occupies a dominant position in the mobile phone camera autofocus system due to its high technical maturity, relatively low cost, fast focusing speed and other advantages. The working principle of VCM motor is based on electromagnetic induction, which generates a magnetic field by energizing the coil. The magnetic field interacts with the magnetic field generated by the fixed permanent magnet, thereby generating a driving force to drive the lens to move along the optical axis direction, realizing automatic focusing and zooming function.

[0004] However, although VCM motor has many advantages as mentioned above, its technical limitations are increasingly prominent. First, the driving stroke of VCM motor is relatively short, which limits the range of lens movement, thereby affecting the realization of zoom function and the diversity of shooting scenes. Second, the driving force is limited, which is difficult to meet the growing demand for high-precision positioning and large thrust, especially in low-light environment or shooting tasks that require fast capture of dynamic scenes, this limitation is particularly evident. Third, at the moment when the lens movement of VCM motor stops, due to inertia, the lens often appears slight jitter, which not only affects the stability of the image, but also may cause the decline of user experience.

[0005] Therefore, it is necessary to develop a new piezoelectric motor, camera module and electronic equipment. SUMMARY

[0006] The utility model aims at providing a piezoelectric motor, camera module and electronic equipment, which can not only maintain the cost-effectiveness and fast response advantage of VCM motor, but also significantly improve the positioning accuracy, increase the driving force and stroke, and effectively suppress the jitter of the lens.

[0007] In the first aspect, the utility model discloses a piezoelectric motor, which comprises:

[0008] A shell;

[0009] A motor base connected with the shell;

[0010] A motor carrier is arranged on the motor base to carry the lens.

[0011] A piezoelectric ceramic element is arranged on the outside of the motor carrier to generate deformation based on the inverse piezoelectric effect when a voltage is applied.

[0012] A spring is arranged between the piezoelectric ceramic element and the shell to tightly fit the piezoelectric ceramic element with the motor carrier and transmit the deformation force to drive the motor carrier to move up and down.

[0013] An FPC circuit board is connected with the piezoelectric ceramic element to supply power to the piezoelectric ceramic element and control the operation of the piezoelectric ceramic element.

[0014] Optionally, a positioning member and a guide rail are further included, wherein the positioning member is fixedly arranged on the shell above the motor carrier, and a guide rail groove is formed in the positioning member.

[0015] A guide rail seat is arranged on the motor base.

[0016] A longitudinal guide hole is formed in the motor carrier.

[0017] The upper end of the guide rail is located in the guide rail groove, and the lower end of the guide rail passes through the guide hole and extends into the guide rail seat to limit the movement direction of the motor carrier. By adding the positioning member, the guide rail, and the guide rail seat, the movement direction of the motor carrier can be limited to ensure that it does not deviate from the predetermined trajectory during up and down movement. This improves the stability and reliability of the piezoelectric motor, especially in applications requiring high-precision driving.

[0018] Optionally, the motor base is provided with a boss at a position opposite to the spring to support the spring. By arranging a boss on the motor base, stable support can be provided for the spring. This helps to ensure that the spring can maintain stable performance when transmitting deformation force, thereby further improving the driving stability and reliability of the piezoelectric motor.

[0019] Optionally, the piezoelectric ceramic element is at least two and symmetrically arranged on the outside of the motor carrier. By using at least two piezoelectric ceramic elements and symmetrically arranging them on the outside of the motor carrier, the driving force and stability of the piezoelectric motor can be enhanced. This arrangement ensures that the piezoelectric ceramic elements can uniformly and coordinately generate deformation when a voltage is applied, thereby achieving smooth and efficient driving of the motor carrier. At the same time, this design also helps to improve the response speed and precision of the piezoelectric motor.

[0020] In a second aspect, the utility model discloses a camera module using the piezoelectric motor as described in the utility model.

[0021] The utility model discloses a camera module.

[0022] The utility model has the following advantages:

[0023] 1. Utilize the inverse piezoelectric effect of piezoelectric ceramic to realize precision driving:

[0024] The utility model utilizes the inverse piezoelectric effect of piezoelectric ceramic element, and through the pre-set voltage signal of piezoelectric ceramic element, makes piezoelectric ceramic element produce corresponding deformation. When voltage rises, piezoelectric ceramic element gradually expands and deforms, thereby driving motor carrier and lens to move up and down. This driving mode has the characteristics of high precision and high sensitivity, and can meet the demand of modern camera module to precision driving.

[0025] 2. Enhance driving force and stroke, avoid magnetic interference:

[0026] The utility model discloses a piezoelectric ceramic element, guide rail and spring etc. component are increased, realize the effect of big driving force and long stroke. The design of spring makes piezoelectric ceramic element and motor carrier closely adhere, and the effective transmission of driving force is ensured. Meanwhile, piezoelectric ceramic element drives motor carrier to move up and down along guide rail after electrification, realizes the stable driving effect. In addition, the piezoelectric ceramic element replaces the traditional magnetic stone and coil structure of voice coil motor in this structure, effectively avoids magnetic interference, improves the stability and reliability of system.

[0027] 3. Improve response speed, realize quick start and stop:

[0028] The design of spring in the utility model not only makes piezoelectric ceramic element and motor carrier closely adhere, but also improves the response speed of system. When voltage signal changes, piezoelectric ceramic element can rapidly produce deformation, thereby driving motor carrier and lens to start or stop quickly. The characteristics of quick response make the utility model have obvious advantages when needing to frequently adjust focal length or shoot dynamic scene.

[0029] 4. Reduce motion resistance, improve driving efficiency:

[0030] The design of guide rail plays the role of reducing motion resistance, makes motor carrier more smooth and stable in the movement process. This not only improves the driving efficiency, but also prolongs the service life of camera module.

[0031] 5. Simple process structure, easy to manufacture and maintain:

[0032] The utility model discloses piezoelectric ceramic, guide rail, spring, motor carrier etc. main component composition, and simple process structure.

[0033] In conclusion, the utility model realizes the technical effect that driving force is big, stroke is long, response speed is fast, motion resistance is reduced and process structure is simple and the like. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is the analysis diagram of piezoelectric motor described in the embodiment of the application;

[0035] Figure 2 It is the structural schematic diagram of piezoelectric motor described in the embodiment of the application;

[0036] The figure mark explanation: 1, shell, 2, FPC circuit board, 3, positioning piece, 4, guide rail, 5, piezoelectric ceramic element, 6, spring, 7, motor base, 71, guide rail seat, 72, boss, 8, motor carrier. DETAILED DESCRIPTION

[0037] The implementation of the technical scheme of the utility model will be explained below with reference to the drawings and preferred embodiments, and the person skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification. The utility model can also be implemented or applied by another different specific implementation, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be understood that the preferred embodiments are only for illustrating the utility model, not for limiting the protection scope of the utility model.

[0038] As Figure 1 shown, in the embodiment of the application, a piezoelectric motor includes a shell 1, a motor base 7, a motor carrier 8, a piezoelectric ceramic element 5, a spring 6 and an FPC circuit board 2. The shell 1 serves as a protective layer of the piezoelectric motor and is connected with the motor base 7 to accommodate and fix the internal components. The motor carrier 8 is arranged on the motor base 7 to carry a lens (not shown in the figure). The piezoelectric ceramic element 5 is arranged on the outside of the motor carrier 8. When a voltage is applied to the piezoelectric ceramic element 5, the piezoelectric ceramic element 5 will deform based on the inverse piezoelectric effect. The spring 6 is arranged between the piezoelectric ceramic element 5 and the shell 1 to ensure that the piezoelectric ceramic element 5 is tightly attached to the motor carrier 8 and can transmit the deformation force of the piezoelectric ceramic element 5 to the motor carrier 8, thereby driving the motor carrier 8 to move up and down. The FPC circuit board 2 is connected with the piezoelectric ceramic element 5 and is responsible for supplying power to the piezoelectric ceramic element 5 and controlling its operation. By adjusting the voltage size and direction applied to the piezoelectric ceramic element 5, the deformation degree and direction of the piezoelectric ceramic element 5 can be controlled, and the accurate movement of the motor carrier 8 can be realized.

[0039] As Figure 1 and Figure 2As shown in a possible embodiment, in order to further improve the stability and reliability of the piezoelectric motor, the piezoelectric motor further comprises a positioning member 3 and a guide rail 4. The positioning member 3 is fixedly arranged on the housing 1 and located above the motor carrier 8, and a guide rail groove (not shown in the figure) is formed in the positioning member 3. The motor base 7 is provided with a guide rail seat 71. A longitudinal guide hole (not shown in the figure) is formed in the motor carrier 8. The upper end of the guide rail 4 is located in the guide rail groove, and the lower end of the guide rail 4 penetrates through the guide hole and extends into the guide rail seat 71, so as to limit the moving direction of the motor carrier 8.

[0040] As shown in a possible embodiment, a boss 72 is arranged on the motor base 7 at a position opposite to the spring 6, for supporting the spring 6. The boss 72 can provide stable support for the piezoelectric ceramic element 5 and the spring 6, further improving the driving stability and reliability of the piezoelectric motor. Figure 1 Figure 2 In order to further enhance the driving force and stability of the piezoelectric motor, at least two piezoelectric ceramic elements 5 are symmetrically arranged on the outer side of the motor carrier 8 in the embodiment. This layout can ensure that the piezoelectric ceramic element 5 can uniformly and coordinately deform when a voltage is applied, thereby achieving smooth and efficient driving of the motor carrier 8. At the same time, this design also helps to improve the response speed and accuracy of the piezoelectric motor.

[0041] In the embodiment of the present application, the working principle of the piezoelectric motor is as follows:

[0042] When a voltage is applied to the piezoelectric ceramic element 5, the piezoelectric ceramic element 5 deforms and elongates based on the inverse piezoelectric effect. Due to the action of the spring 6, the deformation of the piezoelectric ceramic element 5 can be quickly transmitted to the motor carrier 8, thereby driving the motor carrier 8 to move up and down along the guide rail 4. By adjusting the voltage size and direction applied to the piezoelectric ceramic element 5, the deformation degree and direction of the piezoelectric ceramic element 5 can be controlled, thereby realizing the accurate movement of the motor carrier 8. This driving method has the advantages of high precision, high driving force and long stroke, and is very suitable for camera modules and electronic devices that require high-quality image capture and shooting.

[0043] In summary, the piezoelectric motor in the embodiment of the present application achieves the driving effect of high precision, high driving force and long stroke. At the same time, it has simple structure, easy manufacturing and maintenance, and has wide application prospect and market demand.

[0044] In the embodiment of the present application, a camera module adopts the piezoelectric motor as described in the application embodiment.

[0045] In the embodiment of the present application, an electronic device adopts the camera module as described in the application embodiment.

[0046] In the embodiment of the present application, an electronic device adopts the camera module as described in the application embodiment.

[0047] ​The above-mentioned embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited to the above-mentioned embodiments, and any change, modification, replacement, combination, simplification, which is not deviated from the spirit and principle of the present application, should be an equivalent replacement mode, and all are included in the protection scope of the present application.

Claims

1. A piezoelectric motor characterized by comprising: include: Outer shell (1); The motor base (7) is connected to the housing (1); The motor carrier (8) is mounted on the motor base (7) and is used to support the lens; A piezoelectric ceramic element (5) is disposed on the outside of the motor carrier (8) and is used to generate deformation based on the inverse piezoelectric effect when a voltage is applied; A spring (6) is disposed between the piezoelectric ceramic element (5) and the outer shell (1) to make the piezoelectric ceramic element (5) and the motor carrier (8) fit tightly together and transmit deformation force to drive the motor carrier (8) to move up and down. The FPC circuit board (2) is connected to the piezoelectric ceramic element (5) and is used to supply power to the piezoelectric ceramic element (5) and control the operation of the piezoelectric ceramic element (5).

2. The piezoelectric motor according to claim 1, wherein It also includes positioning components (3) and guide rails (4); The positioning component (3) is fixedly mounted on the outer shell (1) and located above the motor carrier (8). The positioning component (3) has a guide rail groove. The motor base (7) is provided with a guide rail seat (71). The motor carrier (8) has a longitudinally penetrating guide hole; The upper end of the guide rail (4) is located in the guide rail groove, and the lower end of the guide rail (4) passes through the guide hole and extends into the guide rail seat (71) to restrict the movement direction of the motor carrier (8).

3. The piezoelectric motor of claim 1, wherein: The motor base (7) has a boss (72) for supporting the spring (6) at a position opposite to the spring (6).

4. The piezoelectric motor of claim 1, wherein: There are at least two piezoelectric ceramic elements (5), which are symmetrically arranged on the outside of the motor carrier (8).

5. A camera module, characterized by: The piezoelectric motor described in any one of claims 1 to 4 is used.

6. An electronic device, comprising: The camera module as described in claim 5 is used.

Images