Piezoelectric motor, camera device, and electronic device

Abstract

The present disclosure provides a piezoelectric motor, comprising: a housing, a piezoelectric drive unit, the piezoelectric drive unit comprising a piezoelectric element, two rod-shaped parts, and an elastic part, the elastic part is fixed to the housing, the piezoelectric element is fixed to the elastic part, the rod-shaped part is fixed to the piezoelectric element so as to provide a driving force through the rod-shaped part by deformation of the piezoelectric element, a friction part, the driving force provided by the rod-shaped part is applied to the friction part so that the friction part rotates, and a motor shaft, which passes through and is fixedly connected to the friction part so as to rotate through the rotation of the friction part, wherein the number of the piezoelectric drive units is more than two, and the more than two piezoelectric drive units are equally divided along the circumference of the housing. The present disclosure also provides a camera device and an electronic device.

Description

Technical Field

[0001] The present disclosure relates to a piezoelectric motor, a camera device, and an electronic device. Background Art

[0002] In portable devices such as smartphones and tablets, the camera modules are being pursued for diversification and higher precision. However, as the diameter of lenses and other components increases and the lens mass increases, conventional methods such as the VCM (voice coil motor) method tend to have insufficient driving force.

[0003] Therefore, how to design a small motor with high torque to achieve large driving force and miniaturization has become an urgent problem that needs to be solved. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the present disclosure provides a piezoelectric motor, a camera device, and an electronic device.

[0005] According to one aspect of the present disclosure, a piezoelectric motor includes:

[0006] case,

[0007] A piezoelectric driving part, the piezoelectric driving part includes a piezoelectric element, two rod-shaped parts, and an elastic part, the elastic part is fixed to the housing, the piezoelectric element is fixed to the elastic part, and the rod-shaped part is fixed to the piezoelectric element so as to provide a driving force through the rod-shaped part by deformation of the piezoelectric element.

[0008] a friction portion, to which a driving force provided by the rod-shaped portion is applied, so that the friction portion rotates, and

[0009] a motor shaft, penetrating through and fixedly connected to the friction part so as to be rotated by the rotation of the friction part,

[0010] There are more than two piezoelectric drive units, and the more than two piezoelectric drive units are equally divided and arranged along the circumference of the shell.

[0011] According to at least one embodiment of the present disclosure, the piezoelectric element of each piezoelectric driving part includes a first part, a second part, a third part and a fourth part. By applying current to the second part and the third part, the friction part and the motor shaft rotate in a counterclockwise direction. By applying current to the first part and the fourth part, the friction part and the motor shaft rotate in a clockwise direction.

[0012] According to at least one embodiment of the present disclosure, two grooves are provided on the piezoelectric element, and each groove provides an accommodation space for two rod-shaped portions, so as to partially accommodate the rod-shaped portions.

[0013] According to at least one embodiment of the present disclosure, an adhesive resin is provided in the groove so as to fix the rod-shaped portion to the piezoelectric element.

[0014] According to at least one embodiment of the present disclosure, a straight line parallel to a line connecting the center points of two rod-shaped portions in the same piezoelectric element is set as a first straight line, a tangent line of a contact point between the rod-shaped portion and the friction portion is set as a second straight line, and a straight line in the direction of a driving force provided by the rod-shaped portion is set as a third straight line, and an angle θ1 formed between the first straight line and the second straight line is smaller than an angle θ2 formed between the first straight line and the third straight line.

[0015] According to at least one embodiment of the present disclosure, the angle θ1 formed between the first straight line and the second straight line is set to: θ1=ASIN(0.5×D / (r1+r2)), wherein ASIN is an inverse sine function, D is the distance between the center points of the two rod-shaped portions of the same piezoelectric drive portion, r1 is the radius of the friction portion, and r2 is the radius of the rod-shaped portion.

[0016] According to at least one embodiment of the present disclosure, when the piezoelectric driving part provides driving force for the friction part, the rod-shaped part contacts the friction part, and when the piezoelectric driving part does not provide driving force for the friction part, the rod-shaped part does not contact the friction part.

[0017] According to at least one embodiment of the present disclosure, the friction portion is circular, the number of the piezoelectric drive portions is two, and the two piezoelectric drive portions are arranged opposite to each other along the circumferential direction of the shell.

[0018] According to another aspect of the present disclosure, a camera device includes the piezoelectric motor as described above.

[0019] According to yet another aspect of the present disclosure, an electronic device includes the camera device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0021] Figure 1 is a schematic diagram of a piezoelectric driving unit according to one embodiment of the present disclosure.

[0022] Figure 2 It is a schematic diagram of the operation of a piezoelectric drive unit according to one embodiment of the present disclosure.

[0023] Figure 3 Schematic diagram of the electrode side of a piezoelectric drive unit according to an embodiment of the present disclosure.

[0024] Figure 4 is a schematic diagram of a piezoelectric motor according to one embodiment of the present disclosure.

[0025] Figure 5 is a schematic diagram of a piezoelectric motor according to one embodiment of the present disclosure.

[0026] Figure 6 is a schematic diagram of a piezoelectric motor arrangement according to one embodiment of the present disclosure.

[0027] Description of Reference Numerals

[0028] 10 Piezoelectric Motor

[0029] 100 Piezoelectric drive unit

[0030] 101 Piezoelectric element

[0031] 101a Part 1

[0032] 101b Part 2

[0033] 101c Part III

[0034] 101d Part 4

[0035] 102 Rod

[0036] 103 Grooves

[0037] 104 Elasticity

[0038] 200 Shell

[0039] 201 Sidewall

[0040] 202 bottom wall

[0041] 300 Friction part

[0042] 400 Motor shaft

[0043] 1011 Electrode terminal

[0044] 1012 Ground terminal

[0045] L1 First straight line

[0046] L2 Second straight line

[0047] L3 The third straight line. DETAILED DESCRIPTION

[0048] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0049] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure can be combined with each other. The technical solution of the present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as providing exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present disclosure.

[0051] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0052] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0053] For descriptive purposes, the present disclosure may use spatially relative terms such as "under," "beneath," "under," "above," "upper," "above," "higher," and "side (e.g., as in "sidewall")," to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "under" or "beneath" other components or features would subsequently be positioned "above" the other components or features. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0054] Reference Figure 1 , provides a schematic diagram of a piezoelectric drive unit of a piezoelectric motor according to an embodiment of the present disclosure, wherein Figure 1 (a) shows a plan view of the piezoelectric drive unit. Figure 1 (b) shows a side view of the plan view, Figure 1 (c) shows a bottom view of the plan view.

[0055] like Figure 1 As shown, the piezoelectric driving unit 100 may include a piezoelectric element 101 and a rod-shaped unit 102 .

[0056] The piezoelectric element 101 may be composed of four parts, and the specific composition will be described in detail below.

[0057] The rod-shaped portion 102 may be made of metal, may be in the shape of a round rod, and may be disposed on the piezoelectric element 101 .

[0058] A groove 103 may be provided at the rod-shaped portion of the piezoelectric element 101. The groove 103 may be triangular or in other shapes. It is used to accommodate a portion of the rod-shaped portion 102, and the groove 103 may also be filled with a viscous resin so as to fix the rod-shaped portion 102 to the piezoelectric element 101.

[0059] When the piezoelectric element 101 is energized and deformed, it will drive the rod-shaped portion 102 to move. Figure 2 Explain it.

[0060] exist Figure 2 , a schematic diagram of the operation of the piezoelectric drive unit 100 is shown. The piezoelectric element 101 includes four parts: a first part 101a, a second part 101b, a third part 101c and a fourth part 101d. Figure 2 As shown in (a), when the second part 101b and the third part 101c are energized, the piezoelectric drive unit 100 will Figure 2 (a), and when the first part 101a and the fourth part 101d are energized, the piezoelectric drive unit 100 will move in the direction shown in FIG. Figure 2 (b) Move in the direction shown.

[0061] Figure 3 A schematic diagram of an electrode surface of the piezoelectric driving unit 100 is shown. The electrode surface may be provided with an electrode terminal 1011 and a ground terminal 1012 so as to supply power to the piezoelectric element 101 of the piezoelectric driving unit 100 through these electrode terminals.

[0062] Figure 4 FIG. 1 is a schematic diagram of a piezoelectric motor 10 according to an embodiment of the present disclosure, wherein two piezoelectric driving parts 100 are arranged in the piezoelectric motor.

[0063] like Figure 4 As shown, the piezoelectric motor 10 may include a piezoelectric driving part 100 , a housing 200 , a friction part 300 and a motor shaft 400 .

[0064] The two piezoelectric driving parts 100 are arranged opposite to each other, and the rod-shaped part 102 faces the friction part 300. The piezoelectric element 101 can be fixed to the housing 200 through the elastic part 104. The elastic part 104 can be made of elastic rubber, silicone and other materials.

[0065] The rod-shaped portion 102 may contact the friction portion 300 , and a motor shaft 400 is disposed in the friction portion 300 .

[0066] The housing 200 may include a side wall 201 and a bottom wall 202 , wherein the elastic portion 104 is fixed to the side wall 201 , and one end of the motor shaft 400 may be rotatably connected to the bottom wall 202 .

[0067] In this way, the friction part 300 is driven by the piezoelectric driving part 100 to rotate, thereby driving the motor shaft 400 to rotate. In this way, other components can be driven by the rotation of the motor shaft 400.

[0068] According to a further embodiment of the present disclosure, more than two piezoelectric drive units 100 may be provided in the piezoelectric motor, for example Figure 5 As shown. Figure 5 Three are shown in the figure, but according to the principle of the present disclosure, more piezoelectric drive units 100 may be provided. More than two piezoelectric drive units 100 may be provided in equal parts (with uniform spacing) along the circumference of the housing.

[0069] The following will refer to Figure 6 , the arrangement of the rod-shaped portion 102 is described in detail. Figure 6 The configuration of one rod-shaped portion 102 of the piezoelectric driving portion 100 will be described below. The configuration of other rod-shaped portions has the same principle.

[0070] like Figure 6 As shown, a first straight line L1, a second straight line L2 and a third straight line L3 are set, wherein the first straight line L1 is a straight line parallel to the line connecting the center points of the two rod-shaped parts 102 of the piezoelectric driving part 100. The straight line L2 is a straight line drawn from the contact point between the rod-shaped part 102 and the friction part 300, such as a contact point tangent. The straight line L3 is a straight line in the direction of the driving force provided by the rod-shaped part 102.

[0071] When Figure 6 As shown in (a), when the motor shaft 400 is driven in the clockwise direction, Figure 6 As shown in (c), the friction part 300 is driven by the driving force of the rod-shaped part 102 toward the lower right direction. However, after the rod-shaped part 102 moves toward the lower right direction, when it retracts and moves toward the upper left direction, the movement of the rod-shaped part 102 in the upper left direction will exert an opposite force on the clockwise rotation of the friction part 300, which may cause the friction part 300 to rotate in the opposite direction.

[0072] However, in the present disclosure, the angle θ1 formed between the first straight line L1 and the second straight line L2 is smaller than the angle θ2 formed between the first straight line L1 and the third straight line L3. With this arrangement, when the rod-shaped portion 102 moves toward the lower right direction and provides a driving force for the clockwise rotation of the friction portion 300, when it retracts and moves toward the upper left direction, the rod-shaped portion 102 will not contact the friction portion 300, thereby avoiding providing a force opposite to the clockwise rotation to the friction portion 300.

[0073] According to one embodiment of the present disclosure, the angle θ1 formed between the first straight line L1 and the second straight line L2 can be set as follows: θ1=ASIN(0.5×D / (r1+r2)), wherein ASIN is an inverse sine function, D is the distance between the center points of two rod-shaped portions 102 of a piezoelectric drive portion 100, r1 is the radius of the friction portion 300, and r2 is the radius of the rod-shaped portion.

[0074] In the above manner, the rod-shaped portion 102 can provide a sufficiently large driving force when driving, and does not contact the friction portion 300 when leaving.

[0075] It should be noted that, although only one rod-shaped portion is used for the description, the other rod-shaped portions all adopt the same principle.

[0076] In addition, in the present disclosure, by arranging two piezoelectric driving units 100 opposite to each other, or arranging more than two piezoelectric driving units 100 at equal intervals, the force pushing the piezoelectric element from the direction opposite to the driving force will not affect the motor shaft 400, that is, it will not be applied to the motor shaft 400.

[0077] In addition, provide Figure 2 (a) When the driving force is the same as the arrow, Figure 4 or Figure 5 The motor shaft 400 in the embodiment rotates counterclockwise, but when the current supplied to the piezoelectric element is changed, the current supplied to the piezoelectric element is changed to Figure 2 (b) When the driving force is equal to the arrow shown in Figure 4 or Figure 5 The motor shaft 400 in the embodiment rotates clockwise.

[0078] According to another embodiment of the present disclosure, a camera device is provided, which includes the above-mentioned piezoelectric motor.

[0079] According to yet another embodiment of the present disclosure, an electronic device is provided, which may include the camera device described above.

[0080] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0082] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A piezoelectric motor, characterized in that: include: a housing, comprising side walls and a bottom wall, A piezoelectric driving part, the piezoelectric driving part includes a piezoelectric element, two rod-shaped parts, and an elastic part, the elastic part is fixed to the side wall of the housing, the piezoelectric element is fixed to the elastic part, and the rod-shaped part is fixed to the piezoelectric element so as to provide a driving force through the rod-shaped part by deformation of the piezoelectric element, a friction portion, to which a driving force provided by the rod-shaped portion is applied, so that the friction portion rotates, and a motor shaft, which penetrates through and is fixedly connected to the friction part so as to be rotated by the rotation of the friction part, wherein one end of the motor shaft is rotatably connected to the bottom wall, Wherein, the number of the piezoelectric driving parts is more than two, and the more than two piezoelectric driving parts are equally divided and arranged along the circumference of the shell; A straight line parallel to a line connecting the center points of two rod-shaped parts in the same piezoelectric element is set as a first straight line, a tangent line of a contact point between the rod-shaped part and the friction part is set as a second straight line, a straight line in the direction of the driving force provided by the rod-shaped part is set as a third straight line, an angle θ1 formed between the first straight line and the second straight line is smaller than an angle θ2 formed between the first straight line and the third straight line, and when the rod-shaped part is a round rod and the axial direction of the round rod is parallel to the axial direction of the motor shaft, the angle θ1 formed between the first straight line and the second straight line is set to: θ1=ASIN(0.5×D / (r1+r2)), wherein ASIN is an inverse sine function, D is the distance between the center points of the two rod-shaped parts of the same piezoelectric driving part, r1 is the radius of the friction part, and r2 is the radius of the rod-shaped part.

2. The piezoelectric motor according to claim 1, wherein: The piezoelectric element of each piezoelectric driving part includes a first part, a second part, a third part and a fourth part. By applying current to the second part and the third part, the friction part and the motor shaft rotate in a counterclockwise direction. By applying current to the first part and the fourth part, the friction part and the motor shaft rotate in a clockwise direction.

3. The piezoelectric motor according to claim 1 or 2, wherein: The piezoelectric element is provided with two grooves, and each groove provides a receiving space for two rod-shaped parts respectively, so as to partially receive the rod-shaped parts.

4. The piezoelectric motor according to claim 3, wherein: An adhesive resin is provided in the groove to fix the rod-shaped portion to the piezoelectric element.

5. The piezoelectric motor according to claim 1, wherein: When the piezoelectric driving part provides driving force for the friction part, the rod-shaped part is in contact with the friction part, and when the piezoelectric driving part does not provide driving force for the friction part, the rod-shaped part is not in contact with the friction part.

6. The piezoelectric motor according to claim 1, wherein: The friction part is circular, and the number of the piezoelectric driving parts is two, and the two piezoelectric driving parts are arranged opposite to each other along the circumferential direction of the shell.

7. A camera device comprising the piezoelectric motor according to any one of claims 1 to 6.

8. An electronic device comprising the camera device according to claim 7.

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