CN111240132B

CN111240132B - Actuator for rotating camera module and camera device

Info

Publication number: CN111240132B
Application number: CN202010084726.3A
Authority: CN
Inventors: 余林涛; 曹宏
Original assignee: Ruien Photoelectric Co ltd
Current assignee: Ruien Photoelectric Co ltd
Priority date: 2020-02-10
Filing date: 2020-02-10
Publication date: 2024-05-21
Anticipated expiration: 2040-02-10
Also published as: CN111240132A

Abstract

The present disclosure provides an actuator for camera module rotation, including: the rotating shaft is connected with the camera module and drives the camera module through the rotation of the rotating shaft so as to enable the camera module to rotate; and a piezoelectric driving part controlling the rotation of the rotation shaft so as to control the rotation angle of the camera module. The present disclosure also provides a camera apparatus.

Description

Actuator for rotating camera module and camera device

Technical Field

The present disclosure relates to an actuator for rotating a camera module and a camera device.

Background

In an actuator for driving a camera module to rotate, a stepping motor is generally used in combination with a gear to drive the camera module to rotate, and in this way, it is necessary to solve noise generated by rotation of the gear and reduce power consumption of the driving motor.

In addition, in the driving method using the motor, it is necessary to solve the problems of controlling the rotation speed of the camera module, and the fine adjustment of the desired shooting angle.

In addition, in the technical scheme of camera rotation control, a technical problem of how to provide high torque at a low rotation speed needs to be solved.

Disclosure of Invention

In order to solve at least one of the above technical problems, the present disclosure provides a piezoelectric motor.

According to one aspect of the present disclosure, an actuator for rotating a camera module includes:

the rotating shaft is connected with the camera module and drives the camera module to rotate through the rotation of the rotating shaft; and

And a piezoelectric driving part controlling the rotation of the rotation shaft so as to control the rotation angle of the camera module.

According to at least one embodiment of the present disclosure, the piezoelectric driving part includes a piezoelectric element and a rod-shaped member attached to the piezoelectric element, and a piezoelectric ceramic is sleeved on a portion of the rotation shaft, movement of the rod-shaped member is controlled by deformation of the piezoelectric element, and rotation of the rotation shaft is controlled by frictional contact of the rod-shaped member with the piezoelectric ceramic.

According to at least one embodiment of the present disclosure, the number of the piezoelectric driving parts is two, and the two piezoelectric driving parts are oppositely disposed at both sides of the rotation center of the rotation shaft.

According to at least one embodiment of the present disclosure, further comprising a pressing adjustment portion that adjusts a friction coefficient between the rod-like member and the piezoelectric ceramic by adjusting a pressing force applied to the piezoelectric element.

According to at least one embodiment of the present disclosure, the piezoelectric driving part further includes an elastic member, the rod-shaped member is disposed at a first side of the piezoelectric element, and the elastic member is disposed at a second side of the piezoelectric element opposite to the first side.

According to at least one embodiment of the present disclosure, the pressing adjustment portion includes a pressing adjustment bolt provided on one side of the elastic member, which is an opposite side of the elastic member from the side adjacent to the piezoelectric element, and the pressing adjustment bolt is screwed to adjust the pressing force applied to the piezoelectric element.

According to at least one embodiment of the present disclosure, a flexible circuit board is further included, the flexible circuit board being disposed between the elastic member and the piezoelectric element.

According to at least one embodiment of the present disclosure, the piezoelectric element of the piezoelectric driving part includes a first portion, a second portion, a third portion, and a fourth portion, the rotation shaft is rotated in a first direction by applying a current to the second portion and the third portion through the rod, and the rotation shaft is rotated in a second direction by applying a current to the first portion and the fourth portion through the rod, wherein the first direction is opposite to the second direction.

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

According to another aspect of the present disclosure, a camera apparatus includes: the camera module rotation actuator described above; and

A camera module driven by the actuator.

Drawings

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

Fig. 1 is a schematic diagram of a piezoelectric drive portion according to one embodiment of the present disclosure.

Fig. 2 is a schematic diagram of the piezoelectric driving part operation according to one embodiment of the present disclosure.

Fig. 3 is a side schematic view of a piezoelectric driver electrode according to one embodiment of the present disclosure.

Fig. 4 is a schematic view of a camera module rotation actuator according to one embodiment of the present disclosure.

Fig. 5 is a schematic diagram of a piezoelectric drive portion according to one embodiment of the present disclosure.

Fig. 6 is a schematic view of a camera module rotation actuator with a housing removed according to one embodiment of the present disclosure.

Fig. 7 is a schematic view of a camera module rotation actuator with a housing removed according to one embodiment of the present disclosure.

Fig. 8 is a schematic diagram of piezoelectric driving of an actuator for camera module rotation according to one embodiment of the present disclosure.

Description of the reference numerals

10. Actuator for camera module rotation

100. Piezoelectric driving unit

101. Piezoelectric element

101A first part

101B second part

101C third part

101D fourth part

102. Rod-shaped member

103. Groove

104. Elastic piece

200. Rotating shaft

201. Piezoelectric ceramics

300. Camera module

400. Shell body

401. Shell body

500. Pressure adjusting part

600. Flexible circuit board

700. Frame body

1012. And a grounding end.

Detailed Description

The present disclosure is described in further detail below with reference to the drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant content and not limiting of the present disclosure. It should be further noted that, for convenience of description, only a portion relevant to the present disclosure is shown in the drawings.

In addition, embodiments of the present disclosure and features of the embodiments may be combined with each other without conflict. The technical aspects of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the exemplary implementations/embodiments shown are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Thus, unless otherwise indicated, features of the various implementations/embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concepts of the present disclosure.

The use of cross-hatching and/or shading in the drawings is typically used to clarify the boundaries between adjacent components. As such, the presence or absence of cross-hatching or shading does not convey or represent any preference or requirement for a particular material, material property, dimension, proportion, commonality between illustrated components, and/or any other characteristic, attribute, property, etc. of a component, unless indicated. In addition, in the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. While the exemplary embodiments may be variously implemented, the specific process sequences may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in reverse order from that described. Moreover, like reference numerals designate like parts.

When an element is referred to as being "on" or "over", "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 this reason, the term "connected" may refer to physical connections, electrical connections, and the like, with or without intermediate components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "under … …," "under … …," "under … …," "down," "over … …," "up," "over … …," "higher" and "side (e.g., as in" sidewall ") to describe one component's relationship to another component as shown in the figures. In addition to the orientations depicted in the drawings, the spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture. For example, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "below … …" may encompass both an orientation of "above" and "below". Furthermore, the device 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, there is provided a schematic view of a piezoelectric driving part of an actuator for camera module rotation according to an embodiment of the present disclosure, wherein 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 member 102.

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

The rod-like member 102 may be made of metal, may be in the shape of a round rod, and may be provided on the piezoelectric element 101.

At the place where the rod-like member of the piezoelectric element 101 is provided, a groove 103 may be provided. The shape of the groove 103 may be triangular or other shapes. Which is used to receive a portion of the rod 102 and the recess 103 may also be filled with an adhesive resin to secure the rod 102 to the piezoelectric element 101.

When the piezoelectric element 101 is electrically deformed, the rod 102 is driven to move. This will be described with reference to fig. 2.

Fig. 2 shows a schematic operation 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 101d. As shown in fig. 2 (a), when the second portion 101b and the third portion 101c are energized, the piezoelectric driving portion 100 will operate in the direction shown in fig. 2 (a), and when the first portion 101a and the fourth portion 101d are energized, the piezoelectric driving portion 100 will operate in the direction shown in fig. 2 (b).

Fig. 3 shows a schematic illustration of the electrode surfaces of the piezo drive 100, which may be provided with electrode terminals 1011 and ground terminals 1012 in order to supply the piezo element 101 of the piezo drive 100 with electrical power via these electrode terminals.

Fig. 4 illustrates a camera module rotation actuator 10 according to an embodiment of the present disclosure, and as illustrated in fig. 4, the camera module rotation actuator 10 may include a piezoelectric driving part 100 and a rotation shaft 200.

The camera module rotation actuator 10 includes the piezoelectric driving part 100 described above. Alternatively, the piezoelectric driving part 100 is provided in two in number and is provided on opposite sides of the rotation shaft 200, i.e., provided in opposition, for example, 180 degrees with respect to the rotation center of the rotation shaft 200.

The rotation shaft 200 is connected with the camera module 300, and the camera module 300 is driven by the rotation of the rotation shaft 200 to rotate the camera module 300.

The piezoelectric driving part 100 controls the rotation shaft 200 to rotate so as to control the rotation angle of the camera module 300.

A piezoelectric ceramic 201 is sleeved on a part of the rotation shaft 200, movement of the rod member 102 is controlled by deformation of the piezoelectric element 101, and rotation of the rotation shaft 200 is controlled by frictional contact of the rod member 102 and the piezoelectric ceramic 201. Movement control of the rod 102 is described above.

As shown in fig. 4, a housing 400 may also be included. The housing 400 serves as a support for other components and may be mounted to other devices, such as electronic equipment, etc.

The upper end of the rotation shaft 200 is rotatably fixed to the upper wall surface of the housing 400, and the lower end is rotatably fixed to the lower wall surface of the housing 400. The rotation shaft 200 is rotated correspondingly by the movement of the rod member 102 of the piezoelectric driving part 100 and by the frictional contact between the rod member 102 and the piezoelectric ceramic 201 to drive the piezoelectric ceramic 201 to rotate.

According to a further embodiment, the camera module rotation actuator 10 further includes a pressing adjustment portion 500, the pressing adjustment portion 500 adjusting the friction coefficient between the rod member 102 and the piezoelectric ceramic 201 by adjusting the pressing force applied to the piezoelectric element 101.

The piezoelectric driving part 100 further includes an elastic member 104, the rod-like member 102 being disposed on a first side of the piezoelectric element 101, and the elastic member 104 being disposed on a second side of the piezoelectric element 101 opposite to the first side. Wherein the elastic member can be piezoelectric rubber, silica gel, etc.

The pressing adjustment portion 500 includes a pressing adjustment bolt provided on one side of the elastic member 104, the one side of the elastic member 104 being the opposite side of the elastic member 104 to the side adjacent to the piezoelectric element 101, and the pressing adjustment bolt is screwed to adjust the pressing force applied to the piezoelectric element 101. Thus, when the pressure is increased, the rod-like member 102 is in closer contact with the piezoelectric ceramic 201, so that the friction therebetween will be greater.

A part of the housing 401 may be disposed between the pressure adjusting portion 500 and the elastic member 104, and a bolt hole is formed in the housing 401 to allow the pressure adjusting bolt to be screwed in or out. When screwing in, the pressing adjustment portion 500 applies a larger pressing force to the elastic member 104, and then to the piezoelectric element 101 and the rod-like member 102.

The piezoelectric driving part 100 further includes a flexible circuit board 600, and the flexible circuit board 600 is disposed between the elastic member 104 and the piezoelectric element 101. The flexible circuit board 600 is connected to an external control unit to provide control signals/currents to the piezoelectric element 101. The ultrasonic vibration is performed by controlling a driving signal (rectangular wave) applied to the piezoelectric element 101.

For clarity of illustration, fig. 5 shows a schematic illustration of the placement of a flexible circuit board 600.

Fig. 6 and 7 show schematic views of the camera module rotation actuator 10 with the housing removed. The camera module 300 may be mounted on the frame 700, and the rotation shaft 200 passes through the frame 700 and is fixedly connected with the frame 700, so that the frame 700 may rotate along with the rotation of the rotation shaft 200 and drive the camera module 300 mounted thereon to rotate.

According to a further embodiment of the present disclosure, two piezoelectric driving parts 100 may be provided in the piezoelectric motor, for example, as shown in fig. 4. Although two are shown in fig. 5, more may be provided in accordance with the principles of the present disclosure. More than two piezoelectric driving parts 100 may be equally spaced (uniformly spaced) along the circumferential direction of the rotation shaft 200.

The arrangement of the rod-like member 102 will be specifically described with reference to fig. 8. In fig. 8, the arrangement of one rod 102 of the piezoelectric driving part 100 will be described, and the principle is the same for the arrangement of the other rod.

As shown in fig. 8, 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 center points of the two rod-like members 102 of the piezoelectric driving part 100. The straight line L2 is a straight line drawn at the contact point between the rod-like member 102 and the piezoelectric ceramic 201, for example, a contact point tangent line. The straight line L3 is a straight line in the driving force direction provided by the rod-like member 102.

When the rotation shaft 200 is driven in the clockwise direction as shown in fig. 8 (a), the piezoelectric ceramic 201 is driven by the driving force of the rod 102 in the lower right direction as shown in fig. 8 (c). However, when the rod 102 moves in the upper left direction when retracted after the rod 102 moves in the lower right direction, the upper left movement of the rod 102 will exert an opposite force on the clockwise rotation of the piezoelectric ceramic 201, possibly causing the piezoelectric ceramic 201 to rotate in the opposite direction.

In the present disclosure, however, an angle θ1 formed between the first line L1 and the second line L2 is smaller than an angle θ2 formed between the first line L1 and the third line L3. In this arrangement, when the rod member 102 moves in the right-down direction, after providing a driving force for clockwise rotation of the piezoelectric ceramic 201, the rod member 102 will not come into contact with the piezoelectric ceramic 201 when retracted to move in the left-up direction, thus avoiding providing a force opposite to the clockwise rotation to the piezoelectric ceramic 201.

According to one embodiment of the present disclosure, an angle θ1 formed between the first line L1 and the second line L2 may be set as follows: θ1=asin (0.5×d/(r1+r2)), where ASIN is an arcsine function, D is a distance between center points of the two rod-like members 102 of one piezoelectric driving section 100, r1 is a radius of the piezoelectric ceramic 201, and r2 is a radius of the rod-like member.

In the above manner, the rod member 102 can provide a sufficiently large driving force when driven, and is not in contact with the piezoelectric ceramics 201 when separated.

Although only one rod-like member is described, the other rod-like members employ this principle.

Further, in the present disclosure, by disposing two piezoelectric driving portions 100 in opposition or disposing more than two piezoelectric driving portions 100 at equal intervals, the force pushing the piezoelectric element from the direction opposite to the driving force does not affect the rotation shaft 200, i.e., is not applied to the rotation shaft 200.

According to another embodiment of the present disclosure, there is provided a camera apparatus including the above-described actuator 10 for camera module rotation.

According to still another embodiment of the present disclosure, there is also provided an electronic apparatus, which may include the above-described camera device.

In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "a particular example," "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner 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/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.

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

It will be appreciated by those skilled in the art that the above-described embodiments are merely for clarity of illustration of the disclosure, and are not intended to limit the scope of the disclosure. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present disclosure.

Claims

1. An actuator for rotating a camera module, comprising:

A piezoelectric driving part which controls rotation of the rotation shaft so as to control a rotation angle of the camera module, the piezoelectric driving part including a piezoelectric element and a rod-shaped member attached to the piezoelectric element, and a part of the rotation shaft being sleeved with piezoelectric ceramics, movement of the rod-shaped member being controlled by deformation of the piezoelectric element, and rotation of the rotation shaft being controlled by frictional contact of the rod-shaped member with the piezoelectric ceramics, the number of the piezoelectric driving parts being two, the two piezoelectric driving parts being oppositely disposed at both sides of a rotation center of the rotation shaft,

Further comprising a pressing adjustment portion that adjusts a friction coefficient between the rod-like member and the piezoelectric ceramic by adjusting a pressing force applied to the piezoelectric element,

Wherein the piezoelectric element of the piezoelectric driving part includes a first portion, a second portion, a third portion, and a fourth portion, the rotation shaft is rotated in a first direction by applying a current to the second portion and the third portion by the rod-like member, the rotation shaft is rotated in a second direction by applying a current to the first portion and the fourth portion by the rod-like member, wherein the first direction is opposite to the second direction, two grooves are provided on two different portions of the same side of the piezoelectric element, and each groove provides accommodation spaces for the two rod-like members, respectively, so as to partially accommodate the rod-like members,

The first straight line is a straight line parallel to a connecting line of central points of the two rod-shaped pieces of the piezoelectric driving part, the second straight line is a straight line led out from a contact point between the rod-shaped pieces and the piezoelectric ceramics, the third straight line is a straight line in the driving force direction provided by the rod-shaped pieces, an included angle theta 1 formed between the first straight line and the second straight line is smaller than an included angle theta 2 formed between the first straight line and the third straight line, and the included angle theta 1 formed between the first straight line and the second straight line is set as follows: θ1=asin (0.5×d/(r1+r2)), where ASIN is an arcsine function, D is a distance between center points of two rod-like members of the piezoelectric driving section, r1 is a radius of the piezoelectric ceramic, and r2 is a radius of the rod-like member.

2. The actuator for camera module rotation according to claim 1, wherein said piezoelectric driving part further comprises an elastic member, said rod-like member being provided on a first side of said piezoelectric element, and said elastic member being provided on a second side of said piezoelectric element opposite to said first side.

3. The actuator for camera module rotation according to claim 2, wherein the pressing adjustment portion includes a pressing adjustment bolt provided on one side of the elastic member, the one side of the elastic member being an opposite side of the elastic member from the side adjacent to the piezoelectric element, and the pressing adjustment bolt is screwed to adjust the pressing force applied to the piezoelectric element.

4. A camera module rotation actuator according to claim 2 or 3, further comprising a flexible circuit board disposed between the elastic member and the piezoelectric element.

5. A camera apparatus, comprising:

The camera module rotation actuator according to any one of claims 1 to 4; and

A camera module driven by the actuator.