Piezoelectric prism driving device

Abstract

The utility model provides a piezoelectric prism driving device, and relates to the technical field of optical element driving. The piezoelectric prism driving device comprises a prism assembly, a piezoelectric actuator and a limiting piece, the piezoelectric actuator abuts against the prism assembly, and the piezoelectric actuator is partially embedded in the limiting piece; the piezoelectric actuator comprises a piezoelectric ceramic piece, an actuating piece and a supporting column. The piezoelectric ceramic piece and the actuating piece are fixed along a first fixing face in the thickness direction, and the supporting column and the actuating piece are fixed along a second fixing face in the thickness direction. According to the technical scheme, the technical problems that in the prior art, a single-point supporting prism driving device adopts electromagnetism for driving, two sets of driving are needed while two-axis anti-shaking is achieved, the weight of a motor is large, the rotating stroke is limited, and the rotating angle is small can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical element driving, in particular to a piezoelectric prism driving device. BACKGROUND

[0002] In recent years, optical imaging technology has been widely used in camera modules and other aspects of electronic devices (information devices) such as smart phones. The current optical imaging system generally uses electromagnetic actuators as driving elements, which has the disadvantages of being easily disturbed by magnetic fields and slow response. With the development of technology, piezoelectric ceramic materials have been gradually explored. Piezoelectric ceramic ultrasonic motors are a kind of energy conversion devices that rely on the inverse piezoelectric effect of piezoelectric ceramics to form ultrasonic frequency elliptical vibration at the stator driving position, drive the mover to move through friction contact, and have the advantages of compact structure, small size, and high energy density. It is suitable for use as a driver in small-size high-precision mobile optical devices such as mobile phones. At the resonant frequency, the input electrical energy is converted into the mechanical energy of the specific micro-motion of the stator. The sliding assembly obtains mechanical energy through friction to make the mover produce macro-rotation or linear motion.

[0003] The existing single-point supported prism driving device is usually driven by electromagnetic method. In order to achieve two-axis anti-shake, two groups of driving are needed, which not only increases the weight of the motor, but also has limited rotation stroke and small rotation angle, and the anti-shake effect is not as good as that of piezoelectric driving. CONTENT OF THE INVENTION

[0004] The purpose of the embodiments of the present application is to provide a piezoelectric prism driving device to solve the problems of the existing single-point supported prism driving device, such as electromagnetic driving, the need for two groups of driving to achieve two-axis anti-shake, large weight of the motor, limited rotation stroke, and small rotation angle.

[0005] To solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0006] The present application provides a piezoelectric prism driving device, comprising: a prism assembly, a piezoelectric actuator, and a limiting piece; the piezoelectric actuator is in abutment with the prism assembly, and the piezoelectric actuator is partially embedded in the limiting piece.

[0007] The piezoelectric actuator comprises a piezoelectric ceramic sheet, an actuating sheet, and a support column; the piezoelectric ceramic sheet is fixed with the actuating sheet along the first fixed surface in the thickness direction, and the support column is fixed with the actuating sheet along the second fixed surface in the thickness direction.

[0008] In some modified embodiments of the present application, the prism assembly comprises a prism and a prism carrier, the prism is arranged in the prism carrier, and one side surface of the prism carrier is in abutment with the piezoelectric actuator.

[0009] In some modified embodiments of the present application, the piezoelectric actuator further comprises a first support, a second support and a pre-pressing member, the first support is arranged between the prism assembly and the support column, and the second support is arranged between the piezoelectric ceramic sheet and the pre-pressing member.

[0010] In some modified embodiments of the present application, the pre-pressing member is arranged at the bottom of the limiting member, and the pre-pressing member is a leaf spring, which provides pre-pressing force for the first support and the second support.

[0011] In some modified embodiments of the present application, the top of the support column is provided with a first support fixing groove a, the side of the prism carrier away from the prism is provided with a first support fixing groove b corresponding to the first support fixing groove a, and the first support is arranged between the first support fixing groove a and the first support fixing groove b.

[0012] In some modified embodiments of the present application, the piezoelectric ceramic sheet is provided with a second support fixing groove a in the radial direction, the pre-pressing member is provided with a second support fixing groove b corresponding to the second support fixing groove a, and the second support is arranged in the second support fixing groove a and the second support fixing groove b.

[0013] In some modified embodiments of the present application, the actuator sheet is provided with a circular hole in the center, and the diameters of the second support fixing groove a and the second support fixing groove b are greater than the diameter of the circular hole.

[0014] In some modified embodiments of the present application, the diameter of the largest circle in the cross section of the support column is greater than the diameter of the circular hole and is the same as the diameters of the second support fixing groove a and the second support fixing groove b.

[0015] The support column is a circular ring with a hollow structure, and the inner diameter is the same as the diameter of the circular hole.

[0016] Alternatively, the support column is a cylindrical shape.

[0017] In some modified embodiments of the present application, the limiting member comprises a base and a limiting ring, the bottom of the base is provided with a groove, the piezoelectric ceramic sheet and the actuator sheet are arranged in the groove, the limiting ring is arranged on the base, the limiting ring is provided with a circular through hole, and the support column is arranged in the circular through hole.

[0018] In some modified embodiments of the present application, it further comprises a shell, and the shell is arranged outside the prism assembly.

[0019] Compared with the prior art, the piezoelectric actuator provided by the piezoelectric prism driving device is a single vibrator, the whole actuator is a joint whole, the components are less, the assembly is simple, the mechanical structure is thick, the impact resistance is effectively improved, and the output force is larger. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein the same or corresponding elements refer to the same or corresponding parts wherein:

[0021] Figure 1 The structure schematic view of the piezoelectric prism driving device in the utility model is schematically shown;

[0022] Figure 2 The structure schematic view of the piezoelectric actuator, the base and the prism assembly in the utility model are schematically shown;

[0023] Figure 3 The structure schematic view of the first support and the prism carrier in the piezoelectric actuator in the utility model is schematically shown;

[0024] Figure 4 The structure schematic view of the piezoelectric actuator in the utility model is schematically shown;

[0025] Figure 5 The first cross-sectional structure schematic view of the piezoelectric actuator in the utility model is schematically shown;

[0026] Figure 6 The second cross-sectional structure schematic view of the piezoelectric actuator in the utility model is schematically shown;

[0027] Figure 7 The bottom view schematic view of the second support and the piezoelectric ceramic sheet in the utility model is schematically shown;

[0028] Figure 8 The top view schematic view of the first support and the support column in the utility model is schematically shown;

[0029] Figure 9 The structure schematic view of the limiting piece and the piezoelectric actuator in the utility model is schematically shown from the first perspective;

[0030] Figure 10 The structure schematic view of the limiting piece and the piezoelectric actuator in the utility model is schematically shown from the second perspective;

[0031] Figure 11The utility model discloses a pressure electric actuator's bottom view schematic diagram is shown illustratively in the utility model;

[0032] Figure 12 The utility model discloses a pre -pressing spare and base connection's structure schematic diagram is shown illustratively in the utility model;

[0033] Figure 13 The utility model discloses a support column and actuating piece connection's structure schematic diagram is shown illustratively in the utility model;

[0034] Figure 14 The utility model discloses a part of pressure electric actuator's explosion structure schematic diagram is shown illustratively in the utility model;

[0035] Figure 15 The utility model discloses a pressure electric actuator swings around the first modal schematic diagram of X axle is shown illustratively in the utility model;

[0036] Figure 16 The utility model discloses a pressure electric actuator swings around the second modal schematic diagram of Y axle is shown illustratively in the utility model;

[0037] Figure 17 The utility model discloses a pressure electric actuator is shown illustratively along the third modal schematic diagram of Z axle up and down stretch;

[0038] Figure 18 The utility model discloses a structure schematic diagram that piezoelectric ceramic sheet is shown illustratively as five subareas in the utility model;

[0039] Figure 19 The utility model discloses a structure schematic diagram that piezoelectric ceramic sheet is shown illustratively as four subareas in the utility model.

[0040] Explanation of drawing mark:

[0041] 1, prism assembly;11, prism;12, prism carrier;2, pressure electric actuator;21, piezoelectric ceramic sheet;211, second support piece fixed groove a;22, actuating piece;221, round hole;23, support column;231, first support piece fixed groove a;232, hollow structure;24, first support piece;25, second support piece;26, pre -pressing spare;261, second support piece fixed groove b;3, limit piece;31, base;32, limit ring;4, shell. DETAILED DESCRIPTION

[0042] Exemplary embodiments of the present disclosure will be described below in greater detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and so that the scope of the present disclosure can be conveyed to those skilled in the art.

[0043] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0044] Example

[0045] like Figures 1 to 19 As shown, this embodiment provides a piezoelectric prism driving device, including: a prism assembly 1, a piezoelectric actuator 2, a limiting member 3, and a housing 4; the prism assembly 1 abuts against the piezoelectric actuator 2, the piezoelectric actuator 2 is disposed inside the limiting member 3, and the housing 4 is disposed outside the prism assembly 1.

[0046] The piezoelectric actuator 2 includes a piezoelectric ceramic sheet 21, an actuator sheet 22, a support column 23, a first support member 24, a second support member 25, and a pre-pressing member 26. The piezoelectric ceramic sheet 21 and the actuator sheet 22 are fixed to a first fixed surface along the thickness direction, and the support column 23 and the actuator sheet 22 are fixed to a second fixed surface along the thickness direction. The first support member 24 is located between the prism assembly 1 and the support column 23, and the second support member 25 is located between the piezoelectric ceramic sheet 21 and the pre-pressing member 26. The pre-pressing member 26 is located at the bottom of the limiting member 3, and both ends of the pre-pressing member 26 are fixed to the limiting member 3. In the initial state, the pre-pressing member 26 will have a certain deformation, and the middle part abuts against the second support member 25, providing pre-pressure for the first support member 24 and the second support member 25. The first support member 24 can be a ball or a spherical protrusion, etc., and the second support member 25 can be a ball.

[0047] like Figure 1 , Figure 2 As shown, in a specific implementation, the prism assembly 1 includes a prism 11 and a prism carrier 12. The prism 11 is disposed inside the prism carrier 12, and one side of the prism carrier 12 abuts against the piezoelectric actuator 2.

[0048] like Figure 1 , Figure 4 As shown, in a specific implementation, the pre-compression member 26 can be a leaf spring, and there is a certain pre-compression between the leaf spring and the second support member 25, which can provide pre-compression for the first support member 24 and the second support member 25 at the same time; the pre-compression member 26 can also be a magnetic pre-compression, which generates magnetic attraction force and provides pre-compression for the first support member 24 and the second support member 25.

[0049] like Figure 4 , Figure 12 , Figure 14As shown in the specific implementation, wherein when the first support 24 is provided as a ball, the support column 23 is provided with a first support fixing groove a 231 at the top, the ball is at least partially arranged in the first support fixing groove a 231, the prism carrier 12 is provided with a first support fixing groove b corresponding to the first support fixing groove a 231 on the side away from the prism 11, and the other part of the ball is arranged in the first support fixing groove b. The first support fixing groove a 231 and the second support fixing groove b form a first support fixing groove, and the first support 24 is arranged in the first support fixing groove.

[0050] The piezoelectric ceramic sheet 21 is provided with a second support fixing groove a 211 at the center in the radial direction, and the pre-pressing piece 26 is provided with a second support fixing groove b 261 corresponding to the second support fixing groove a 211. The second support fixing groove a 211 and the second support fixing groove b form a second support fixing groove, and the second support 25 is arranged in the second support fixing groove.

[0051] As shown in the specific implementation, Figure 5 , Figure 6 wherein the actuating sheet 22 is provided with a circular hole 221 at the center, and the diameter of the second support fixing groove is greater than the diameter of the circular hole 221.

[0052] The diameter of the maximum circle of the cross section of the support column 23 is greater than the diameter of the circular hole 221 on the actuating sheet 22 and is the same as the diameter of the second support fixing groove;

[0053] wherein the support column 23 can be a circular ring provided with a hollow structure 232, and the inner diameter is the same as the diameter of the circular hole 221;

[0054] The support column 23 can also be a cylindrical shape.

[0055] As shown in the specific implementation, Figure 9 , Figure 10 wherein the limiting piece 3 includes a base 31 and a limiting ring 32, the base 31 is provided with a groove at the bottom, the piezoelectric ceramic sheet 21 and the actuating sheet 22 are arranged in the groove, the base 31 is provided with the limiting ring 32, the limiting ring 32 is provided with a circular through hole, and the support column 23 is arranged in the circular through hole.

[0056] Specifically, the piezoelectric ceramic sheet 21 is provided with a partition structure, which can be four partitions or five partitions.

[0057] The voltage distribution rule of the piezoelectric ceramic sheet 21 provided with five partitions is as follows:

[0058]

[0059] The voltage distribution rule of the piezoelectric ceramic sheet 21 provided with four partitions is as follows:

[0060]

[0061] The explanation of the division rule of the piezoelectric ceramic sheet 21:

[0062] (1) For the first mode, the push-pull mode voltage Up acts on the 1, 2, 3, 4 zones, the swing mode voltage Us acts on the 1, 3 zones, and -Us acts on the 2, 4 zones (when reversed, the swing mode voltage -Us acts on the 1, 3 zones, and Us acts on the 2, 4 zones), then U1=U3=Up+Us; U2=U4=Up-Us, after pushing, U1 / U3 and U2 / U4 differ by 90 degrees phase.

[0063] (2) The advantage of setting the piezoelectric ceramic sheet to four zones is that the control port is less, and the control circuit and algorithm are simpler than five zones. The advantage of setting the piezoelectric ceramic sheet to five zones is that the size ratio of the push-pull mode piezoelectric region and the swing piezoelectric region can be adjusted to achieve the desired elliptical trajectory.

[0064] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A piezoelectric prism driving device, characterized in that, The prism assembly, the piezoelectric actuator and the limiting piece are included; the piezoelectric actuator is in abutment with the prism assembly, and the piezoelectric actuator is partially embedded in the limiting piece; The piezoelectric actuator includes a piezoelectric ceramic sheet, an actuating sheet and a support column; the piezoelectric ceramic sheet is fixed with the actuating sheet along the first fixed surface in the thickness direction, and the support column is fixed with the actuating sheet along the second fixed surface in the thickness direction. The prism assembly includes a prism and a prism carrier, the prism is arranged in the prism carrier, and one side of the prism carrier is in abutment with the piezoelectric actuator.

2. The piezoelectric prism driving apparatus according to claim 1, wherein The piezoelectric actuator further includes a first support, a second support and a pre-pressing piece; the first support is arranged between the prism assembly and the support column, and the second support is arranged between the piezoelectric ceramic sheet and the pre-pressing piece.

3. The piezoelectric prism driving apparatus according to claim 1, wherein The pre-pressing piece is arranged at the bottom of the limiting piece, and the pre-pressing piece is a leaf spring, which provides pre-pressing force for the first support and the second support.

4. The piezoelectric prism driving apparatus according to claim 3, wherein The top of the support column is provided with a first support fixing groove a, and the side of the prism carrier away from the prism is provided with a first support fixing groove b corresponding to the first support fixing groove a, and the first support is arranged between the first support fixing groove a and the first support fixing groove b.

5. The piezoelectric prism driving apparatus according to claim 3, wherein The center of the piezoelectric ceramic sheet is provided with a second support fixing groove a in the radial direction, and the pre-pressing piece is provided with a second support fixing groove b corresponding to the second support fixing groove a, and the second support is arranged in the second support fixing groove a and the second support fixing groove b.

6. The piezoelectric prism driving apparatus according to claim 3, wherein The center of the actuating sheet is provided with a circular hole, and the diameters of the second support fixing groove a and the second support fixing groove b are greater than the diameter of the circular hole.

7. The piezoelectric prism driving apparatus according to claim 6, wherein The diameter of the maximum circle of the cross section of the support column is greater than the diameter of the circular hole, and is the same as the diameters of the second support fixing groove a and the second support fixing groove b; 8. The piezoelectric prism driving apparatus according to claim 7, wherein The support column is a circular ring with a hollow structure, and the inner diameter is the same as the diameter of the circular hole. Or, the support column is a cylindrical shape. The limiting piece includes a base and a limiting ring, the bottom of the base is provided with a groove, the piezoelectric ceramic sheet and the actuating sheet are arranged in the groove, the base is provided with a limiting ring, the limiting ring is provided with a circular through hole, and the support column is arranged in the circular through hole.

9. The piezoelectric prism driving apparatus according to claim 1, wherein Further including:

10. The piezoelectric prism driving apparatus according to claim 1, wherein The shell is arranged outside the prism assembly. ​

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