CN211630099U

CN211630099U - Piezoelectric motor, camera device, and electronic apparatus

Info

Publication number: CN211630099U
Application number: CN202020055799.5U
Authority: CN
Inventors: 余林涛; 曹宏
Original assignee: Ruien Photoelectric Co ltd
Current assignee: Ruien Photoelectric Co ltd
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2020-10-02
Anticipated expiration: 2030-01-10

Abstract

The utility model provides a piezoelectric motor, include: the piezoelectric driving device comprises a shell, a piezoelectric driving part, the piezoelectric driving part comprises a piezoelectric element, two rod-shaped parts and an elastic part, wherein the elastic part is fixed on the shell, the piezoelectric element is fixed on the elastic part, the rod-shaped parts are fixed on the piezoelectric element so as to provide driving force through the rod-shaped parts through the deformation of the piezoelectric element, a friction part is formed in the friction part, the driving force provided by the rod-shaped parts is applied to the friction part, and therefore the friction part rotates. The utility model also provides a camera device and electronic equipment.

Description

Piezoelectric motor, camera device, and electronic apparatus

Technical Field

The utility model relates to a piezoelectric type motor, camera device and electronic equipment.

Background

In portable devices such as smart phones and tablet computers, diversification and high precision of camera modules are continuously pursued. However, with the increase in the diameter of lenses and the like and the increase in the mass of lenses, conventional methods such as the VCM (voice coil motor) method tend to have insufficient driving force.

Therefore, how to design a small motor with high torque to realize large driving force and miniaturization is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the above technical problems, the utility model provides a piezoelectric motor, camera device and electronic equipment.

According to an aspect of the present invention, a piezoelectric motor includes:

a shell body, a plurality of first connecting rods and a plurality of second connecting rods,

a piezoelectric driving part including a piezoelectric element, two rod parts, and an elastic part fixed to the case, the piezoelectric element being fixed to the elastic part, the rod parts being fixed to the piezoelectric element so as to provide a driving force through the rod parts by deformation of the piezoelectric element,

a friction portion to which a driving force provided by the rod portion is applied to rotate the friction portion, and

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

the number of the piezoelectric driving parts is more than two, and the more than two piezoelectric driving parts are arranged at equal intervals along the circumferential direction of the shell.

According to at least one embodiment of the present invention, the piezoelectric element of each piezoelectric driving part includes a first portion, a second portion, a third portion, and a fourth portion, and by applying a current to the second portion and the third portion, the friction part and the motor shaft are made to rotate in the counterclockwise direction, and by applying a current to the first portion and the fourth portion, the friction part and the motor shaft are made to rotate in the clockwise direction.

According to at least one embodiment of the present invention, two grooves are provided on the piezoelectric element, and each groove provides a receiving space for two rod-shaped portions, respectively, so as to partially receive the rod-shaped portions.

According to at least one embodiment of the present invention, an adhesive resin is provided in the groove so as to fix the rod-like portion to the piezoelectric element.

According to the utility model discloses an at least one embodiment, the straight line that the line of setting for the central point of two shaft-like portions in same piezoelectric element parallels is first straight line, and the tangent line of setting for the contact point between shaft-like portion and the friction portion is the second straight line, and the straight line on the drive power direction that the setting shaft-like portion provided is the third straight line, and contained angle theta 1 that forms between first straight line and the second straight line is less than contained angle theta 2 that forms between first straight line and the third straight line.

According to at least one embodiment of the present invention, the included angle θ 1 formed between the first straight line and the second straight line is set as: θ 1 — ASIN (0.5 × D/(r1+ r2)), where ASIN is an arcsine function, D is the distance between the center points of two rod-shaped portions of the same piezoelectric driving portion, r1 is the radius of the friction portion, and r2 is the radius of the rod-shaped portion.

According to at least one embodiment of the present invention, when the piezoelectric driving part provides the driving force to the friction part, the rod-shaped part is in contact with the friction part, and when the piezoelectric driving part does not provide the driving force to the friction part, the rod-shaped part is not in contact with the friction part.

According to at least one embodiment of the present invention, the friction portion is circular, the number of the piezoelectric driving portions is two, and the two piezoelectric driving portions are disposed along the circumferential direction of the housing.

According to another aspect of the present invention, a camera device includes the piezoelectric motor as described above.

According to still another aspect of the present invention, an electronic apparatus includes the camera device as described above.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic view of a piezoelectric driving section according to an embodiment of the present invention.

Fig. 2 is a schematic diagram showing the operation of the piezoelectric drive unit according to an embodiment of the present invention.

Fig. 3 is a schematic electrode-side view of a piezoelectric drive unit according to an embodiment of the present invention.

Fig. 4 is a schematic view of a piezoelectric motor according to an embodiment of the present invention.

Fig. 5 is a schematic view of a piezoelectric motor according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of a piezoelectric motor arrangement according to an embodiment of the present invention.

Description of the reference numerals

10 piezoelectric motor

100 piezoelectric driving part

101 piezoelectric element

101a first part

101b second part

101c third part

101d fourth section

102 rod-shaped part

103 groove

104 elastic part

200 shell

201 side wall

202 bottom wall

300 friction part

400 motor shaft

1011 electrode terminal

1012 ground terminal

L1 first straight line

L2 second straight line

L3 third straight line.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention. It should be noted that, for convenience of description, only the parts related to the present invention are shown in the drawings.

In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict. The technical solution of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

Unless otherwise indicated, the illustrated exemplary embodiments/examples will be understood as providing exemplary features of various details of some ways in which the technical concepts of the present invention may be practiced. Thus, unless otherwise indicated, the features of the various embodiments/examples may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present invention.

The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.

When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.

For descriptive purposes, the invention may use spatially relative terms such as "below … …," "below … …," "below … …," "below," "above … …," "above … …," "higher," and "side (e.g., as in" side wall ") to describe one component's relationship to another (other) component as illustrated in the figures. 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 figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Referring to fig. 1, a schematic diagram of a piezoelectric driving part of a piezoelectric motor according to an embodiment of the present invention is provided, in which fig. 1(a) shows a plan view of the piezoelectric driving part, fig. 1(b) shows a side view of the plan view, and fig. 1(c) shows a bottom view of the plan view.

As shown in fig. 1, the piezoelectric driving part 100 may include a piezoelectric element 101 and a rod part 102.

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

The rod-shaped portion 102 may be made of metal, may be in the shape of a circular rod, and may be provided on the piezoelectric element 101.

At the position where the rod-shaped portion of the piezoelectric element 101 is provided, a groove 103 may be provided. The shape of the recess 103 may be triangular, but may also be other shapes. Which is used to accommodate a part of the rod portion 102, and the recess 103 may also be filled with an adhesive resin in order to fix the rod portion 102 to the piezoelectric element 101.

When the piezoelectric element 101 is deformed by electricity, the rod-shaped portion 102 is moved. This will be explained with reference to fig. 2.

Fig. 2 shows an operation diagram of the piezoelectric driving unit 100. The piezoelectric element 101 includes four parts: a first portion 101a, a second portion 101b, a third portion 101c and a fourth portion 101 d. As shown in fig. 2(a), when the second portion 101b and the third portion 101c are energized, the piezoelectric driving part 100 operates in the direction shown in fig. 2(a), and when the first portion 101a and the fourth portion 101d are energized, the piezoelectric driving part 100 operates in the direction shown in fig. 2 (b).

Fig. 3 shows a schematic electrode surface diagram of the piezoelectric driver 100, which may be provided with an electrode terminal 1011 and a ground terminal 1012 to supply power to the piezoelectric element 101 of the piezoelectric driver 100 through the electrode terminals.

Fig. 4 shows a schematic view of a piezoelectric motor 10 according to an embodiment of the present invention. Two piezoelectric driving units 100 are provided in the piezoelectric motor.

As shown in fig. 4, the piezoelectric motor 10 may include a piezoelectric driving part 100, a housing 200, a friction part 300, and a motor shaft 400.

The two piezoelectric driving portions 100 are disposed opposite to each other, and the rod portion 102 faces the friction portion 300. And the piezoelectric element 101 may be fixed to the case 200 by the elastic portion 104. The elastic portion 104 may be made of elastic rubber, silicone, or the like.

The rod portion 102 may contact the friction portion 300. And a motor shaft 400 is provided in the friction part 300.

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

Thus, the friction part 300 is rotated by the driving of the piezoelectric driving part 100, and the motor shaft 400 is rotated. So that other components can be driven by the rotation of the motor shaft 400.

According to a further embodiment of the present invention, more than two piezoelectric driving parts 100 may be provided in the piezoelectric motor, for example, as shown in fig. 5. Although three are shown in fig. 5, more may be provided in accordance with the principles of the present invention. More than two piezoelectric driving parts 100 may be equally spaced (evenly spaced) along the circumference of the housing.

The arrangement of the lever 102 will be described specifically with reference to fig. 6. Fig. 6 illustrates the arrangement of one rod 102 of the piezoelectric driving unit 100, and the other rod is arranged in the same manner.

As shown in fig. 6, 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 a line connecting the center points of the two rod-shaped portions 102 of the piezoelectric driving portion 100. The line L2 is a straight line drawn from a contact point between the rod-shaped portion 102 and the friction portion 300, for example, a tangent to the contact point. The straight line L3 is a straight line in the direction of the driving force provided by the rod-shaped portion 102.

When the motor shaft 400 is driven in the clockwise direction as shown in fig. 6(a), the friction part 300 is driven by the driving force of the rod part 102 in the right-downward direction as shown in fig. 6 (c). However, when the rod portion 102 is moved in the lower right direction and then moved in the upper left direction at the time of retraction, the upward left movement of the rod portion 102 exerts an opposite force on the clockwise rotation of the friction portion 300, and the friction portion 300 may be rotated in the opposite direction.

However, in the present invention, the included angle θ 1 formed between the first straight line L1 and the second straight line L2 is smaller than the included angle θ 2 formed between the first straight line L1 and the third straight line L3. With this arrangement, when the rod portion 102 is moved in the lower right direction to provide a driving force for clockwise rotation of the friction portion 300 and then moved in the upper left direction, the rod portion 102 will not come into contact with the friction portion 300, thus preventing a force opposite to the clockwise rotation from being provided to the friction portion 300.

According to an embodiment of the present invention, the included angle θ 1 formed between the first straight line L1 and the second straight line L2 may be set as follows: θ 1 — ASIN (0.5 × D/(r1+ r2)), where ASIN is an arcsine function, D is the distance between the center points of the two rod-shaped portions 102 of one piezoelectric driving portion 100, r1 is the radius of the friction portion 300, and r2 is the radius of the rod-shaped portion.

In this way, the rod portion 102 can provide a sufficiently large driving force when driven, but does not contact the friction portion 300 when separated.

Although only one rod-shaped portion is described, the principle is applied to all the other rod-shaped portions.

Further, in the present invention, two piezoelectric driving parts 100 are disposed oppositely, or more than two piezoelectric driving parts 100 are disposed at equal intervals, so that the force pushing the piezoelectric element from the direction opposite to the driving force does not affect the motor shaft 400, i.e., is not applied to the motor shaft 400.

Further, the motor shaft 400 in fig. 4 or 5 may be rotated counterclockwise when the driving force of the arrow shown in fig. 2(a) is provided, but the motor shaft 400 in fig. 4 or 5 may be rotated clockwise when the driving force of the arrow shown in fig. 2(b) is provided by changing the current supplied to the piezoelectric element.

According to another embodiment of the present invention, a camera device is provided, which includes the piezoelectric motor.

According to another embodiment of the present invention, there is provided an electronic apparatus including the camera device.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are provided for clarity of description only, and are not intended to limit the scope of the invention. Other variations or modifications to the above described embodiments will be apparent to those skilled in the art and are within the scope of the invention.

Claims

1. A piezoelectric motor, comprising:

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

3. The piezoelectric motor according to claim 1, wherein two grooves are provided in the piezoelectric element, and each groove provides a receiving space for two rod portions to partially receive the rod portions.

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 any one of claims 1 to 4, wherein a line parallel to a line connecting center points of two rod-shaped portions in the same piezoelectric element is set as a first line, a tangent to a contact point between the rod-shaped portion and the friction portion is set as a second line, a line in a direction of the driving force provided by the rod-shaped portion is set as a third line, and an angle θ 1 formed between the first line and the second line is smaller than an angle θ 2 formed between the first line and the third line.

6. The piezoelectric motor according to claim 5 wherein the angle θ 1 formed between the first line and the second line is set to: θ 1 — ASIN (0.5 × D/(r1+ r2)), where ASIN is an arcsine function, D is the distance between the center points of two rod-shaped portions of the same piezoelectric driving portion, r1 is the radius of the friction portion, and r2 is the radius of the rod-shaped portion.

7. The piezoelectric motor according to claim 1, wherein the rod portion is in contact with the friction portion when the piezoelectric driving portion supplies the driving force to the friction portion, and is not in contact with the friction portion when the piezoelectric driving portion does not supply the driving force to the friction portion.

8. The piezoelectric motor according to claim 1, wherein the friction portion is circular, the number of the piezoelectric driving portions is two, and the two piezoelectric driving portions are disposed to face each other in a circumferential direction of the casing.

9. A camera device comprising the piezoelectric motor according to any one of claims 1 to 8.

10. An electronic device comprising the camera apparatus of claim 9.