CN118041120A - Piezoelectric stator, piezoelectric motor, camera and electronic device - Google Patents
Piezoelectric stator, piezoelectric motor, camera and electronic device Download PDFInfo
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The application discloses a piezoelectric stator, a piezoelectric motor, a camera and an electronic device. The piezoelectric stator comprises a deformation assembly, a friction assembly and a piezoelectric assembly, wherein the deformation assembly comprises a first end part, a second end part and a middle part, and the first end part and the second end part are positioned on two sides of the middle part; the friction component is arranged on the middle part; the piezoelectric component is arranged at the first end part and/or the second end part, and drives the deformation component to vibrate under the condition that voltage is applied to the piezoelectric component so as to drive the friction component to do annular motion on a first plane or do annular motion on a second plane, and the first plane is not parallel to the second plane. According to the piezoelectric stator, the piezoelectric assemblies are arranged on the two end parts of the deformation assembly to drive the deformation assembly to vibrate, and the friction assembly connected to the middle part of the deformation assembly is driven to do annular motion in the first plane and the second plane, so that the piezoelectric stator can drive the rotor to move in multiple directions.
Description
Technical Field
The present disclosure relates to electronic devices, and particularly to a piezoelectric stator, a piezoelectric motor, a camera, and an electronic device.
Background
In an image module of an electronic device such as a mobile phone, a piezoelectric motor is generally used to realize auto-focusing and optical anti-shake functions. Most of the existing piezoelectric motors adopt a single-degree-of-freedom design, namely, one piezoelectric stator (or piezoelectric vibrator) can only drive the mover to move in one direction, and the requirement that the mover needs to move in multiple directions is difficult to meet.
Disclosure of Invention
The application provides a piezoelectric stator, a piezoelectric motor, a camera and an electronic device.
The piezoelectric stator comprises a deformation assembly, a friction assembly and a piezoelectric assembly, wherein the deformation assembly comprises a first end part, a second end part and a middle part, and the first end part and the second end part are positioned on two sides of the middle part; the friction assembly is arranged on the middle part; the piezoelectric component is arranged at the first end part and/or the second end part, the deformation component is driven to vibrate by the piezoelectric component under the condition that voltage is applied to the piezoelectric component, so that the friction component is driven to do annular motion on a first plane or do annular motion on a second plane, and the first plane is not parallel to the second plane.
According to the piezoelectric stator, the piezoelectric assemblies are arranged on the two end parts of the deformation assembly to drive the deformation assembly to vibrate, and the friction assembly connected to the middle part of the deformation assembly is driven to do annular motion in the first plane and the second plane, so that the piezoelectric stator can drive the rotor to move in multiple directions.
The piezoelectric motor comprises a piezoelectric stator and a rotor, wherein the rotor is abutted with the friction assembly of the piezoelectric stator, and the friction assembly performs annular movement on the first plane to drive the rotor to linearly move along the length direction perpendicular to the piezoelectric stator; the friction component performs annular motion on the second plane to drive the mover to linearly move along the length direction parallel to the piezoelectric stator;
according to the piezoelectric motor, the mover can be driven to linearly move in different directions through the single piezoelectric stator, and the piezoelectric motor can be miniaturized due to the fact that the piezoelectric stator is small in size and simple in structure.
The camera of the embodiment of the application comprises a piezoelectric motor and a lens, wherein the piezoelectric motor is the piezoelectric motor of the embodiment, and the mover drives the lens to linearly move.
According to the camera, the lens is driven by the piezoelectric motor to move along the straight line, so that the functions of automatic focusing, optical anti-shake and the like of the camera can be realized, and the size of the piezoelectric motor is small, so that the height of a camera module can be reduced.
The electronic device of the embodiment of the application comprises the camera of the embodiment.
The electronic device provided by the embodiment of the application is provided with the camera, so that the shooting effect can be improved, the size and the height of the camera are small, and the design attractiveness of the electronic device can be improved.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural view of a piezoelectric stator according to an embodiment of the present application;
FIG. 2 is a schematic structural view of a deformation assembly of a piezoelectric stator according to an embodiment of the present application;
Fig. 3 is a schematic exploded view of a piezoelectric stator according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a simulation of bending vibration motion of a piezoelectric stator in the Z-axis direction according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a simulation of bending vibration motion of a piezoelectric stator in the Y-axis direction according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a piezoelectric stator according to an embodiment of the present application in which longitudinal vibration occurs in the X-axis direction;
FIG. 7 is a schematic plan view of a piezoelectric motor according to an embodiment of the present application;
FIG. 8 is a schematic plan view of a camera according to an embodiment of the present application;
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Description of main reference numerals:
An electronic device 1000;
a camera 100, a piezoelectric motor 101, and a lens 102;
a piezoelectric stator 10, a deformation assembly 110, a first end 111, a second end 112, an intermediate 113, a friction assembly 120, a piezoelectric assembly 130, a first piezoelectric element 131, a second piezoelectric element 132, a third piezoelectric element 133, a fourth piezoelectric element 134, a fifth piezoelectric element 135, a sixth piezoelectric element 136, a seventh piezoelectric element 137, an eighth piezoelectric element 138, a first end cap 14, a second end cap 15;
and a mover 20.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.
The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
In the related art, in order to achieve the functions of auto-focusing and light zooming, a small motor is usually used in an image module of an electronic device such as a mobile phone. According to the different working principles (driving modes), the motors currently mainstream can be divided into the following types: electromagnetic motor, memory alloy motor, electrostatic force motor, piezoelectric motor. The electromagnetic motor has the advantages of simple structure and longest development time, is the most mature technology at present, but has the bottleneck of thrust and travel in a limited volume; the stroke of the memory alloy motor is limited, and the problem of high power consumption often exists; the electrostatic force motor needs further improvement in terms of reliability; although the piezoelectric motor is superior in performance, the technology, the supply chain, and the like are still immature, and the cost is high.
Unlike conventional electromagnetic motors, the piezoelectric motor of the prior art works as follows: the electric energy is converted into mechanical energy by utilizing the inverse piezoelectric effect of the piezoelectric material, and then the macroscopic motion output of the rotor is realized through the friction coupling between the stator and the rotor. There are two energy conversion processes in the piezoelectric motor operation process: one converts electrical energy into mechanical energy of stator microscopic vibration through inverse piezoelectric effect; the other is to convert the microscopic vibrations of the stator into macroscopic motions of the rotor by friction coupling. The piezoelectric motor has the characteristics of high response speed, high power density, high displacement resolution, electromagnetic interference resistance, power failure self-locking and the like. The image display can be greatly improved, the volume of the whole module can be reduced, and the development potential is great.
However, at present, the piezoelectric motor is basically in a research and development stage, and most of the piezoelectric motors are designed in a single degree of freedom, namely, one piezoelectric stator (or piezoelectric vibrator) can only drive the mover to move in one direction, and if the movement with multiple degrees of freedom is required to be realized, the number of the piezoelectric stators is required to be increased. The multi-stator multi-degree-of-freedom piezoelectric motor has different driving actions of stators on a rotor in the motor operation process, so that mutual interference and obstruction among the stators can be caused, and the motor output performance is affected. At the same time, a plurality of stators can cause the increase of cost and volume and the control is more complex.
Referring to fig. 1-3, a piezoelectric stator 10 of the present application includes a deformation assembly 110, a friction assembly 120 and a piezoelectric assembly 130, wherein the deformation assembly 110 includes a first end 111, a second end 112 and a middle portion 113, and the first end 111 and the second end 112 are located at two sides of the middle portion 113; the friction pack 120 is disposed on the intermediate portion 113; the piezoelectric component 130 is disposed at the first end 111 and/or the second end 112, and when a voltage is applied to the piezoelectric component 130, the piezoelectric component 130 drives the deformation component 110 to vibrate, so as to drive the friction component 120 to perform annular movement on a first plane or perform annular movement on a second plane, where the first plane is not parallel to the second plane.
The piezoelectric stator 10 according to the embodiment of the present application drives the deformation assembly 110 to vibrate by providing the piezoelectric assemblies 130 at both ends of the deformation assembly 110, and drives the friction assembly 120 connected to the middle portion 113 of the deformation assembly 110 to perform an annular movement in the first plane and the second plane, thereby realizing that one piezoelectric stator 10 drives the mover 20 to move in multiple directions.
Specifically, the deformation component 110 of the piezoelectric stator 10 according to the embodiment of the present application includes the deformation component 110 and the friction component 120, where the deformation component 110 may be a metal structural member and may be made of a metal material such as copper, iron, aluminum or alloy metal. The deformation assembly 110 may have a long-strip-shaped or cylindrical structure, and may specifically have a structure with a large volume at both ends and a small volume in the middle. The deformation assembly 110 may be a unitary structure or a combined structure. The middle portion 113 of the deformation assembly 110 may be located in the middle of the deformation assembly 110, and the first end portion 111 and the second end portion 112 may be located at both ends of the middle portion 113. When the deformation assembly 110 is in a non-combined structure, two opposite sides of the middle portion 113 may be respectively connected to the first end 111 and the second end 112, the first end 111 may be one side end of the deformation assembly 110, and the second end 112 may be the other side end of the deformation assembly 110 opposite to the first end 111. The first end portion 111 and the second end portion 112 may be symmetrical with respect to the middle portion 113.
The friction member 120 may be made of aluminum oxide (Al 2O 3), silicon oxide (SiO 2), zirconium oxide (ZrO 2), or carbon fiber, polyester fiber, aluminum, iron, copper, stainless steel, etc., and the friction member 120 may be formed of a cylindrical shape, a semi-cylindrical shape, a spherical shape, a triangular cone shape, or some other irregular shape. In particular, the surface of the friction pack 120 may be chamfered or rounded. The design can ensure that the driving force of the piezoelectric stator 10 can be well transmitted to the rotor 20, and meanwhile, the abrasion under long-time working can be prevented, and the matching precision is kept.
The number of friction members 120 may be one or more, and one or more friction members 120 may be connected to an end surface of the intermediate portion 113 perpendicular to the first end portion 111 or the second end portion 112.
The piezoelectric component 130 may be a combination of elements for driving the deformation component through a piezoelectric effect, the piezoelectric component 130 may be made of a piezoelectric material, the piezoelectric material may be a piezoelectric ceramic sheet, and the material of the piezoelectric ceramic sheet may be selected from lead zirconate titanate (PZT) base piezoelectric ceramic, potassium sodium niobate (KNN) base piezoelectric ceramic, barium Titanate (BT) base piezoelectric ceramic, lead magnesium niobate-lead indium niobate (PMN-PT) base piezoelectric single crystal, textured ceramic, or the like.
The piezoelectric assembly 130 may be fixedly attached to the surface of the first end 111, or fixedly attached to the surface of the second end 112, or both the first end 111 and the second end 112 by various means such as glue bonding, welding, fusing, etc. The surface of the piezoelectric component 130 may be plated with an electrode, and the electrode may apply a voltage to the piezoelectric component 130 to drive the piezoelectric component 130 to polarize, so that the piezoelectric component 130 generates a stretching change, and further drives the first end 111 or the second end 112 or simultaneously drives the first end 111 and the second end 112 to vibrate, where the generated vibration may be high-frequency vibration. Since the first end portion 111 and the second end portion 112 are fixedly connected to the intermediate portion 113, the intermediate portion 113 generates synchronous vibration under the vibration of the first end portion 111 and the second end portion 112.
The friction member 120 may be fixed to the intermediate portion 113 by bonding or welding, etc., for example, the friction member 120 may be fixedly coupled to an end surface of the intermediate portion 113. The friction member 120 will move in a circular shape in the first plane or the second plane by the driving of the intermediate portion 113. The first plane may be non-parallel to the second plane and may be perpendicular to the second plane. It is to be understood that the first plane may be a plane perpendicular to the length direction of the piezoelectric stator 10, i.e., a plane in which the YOZ axis shown in fig. 1 is located. The second plane may be a plane parallel to the length direction of the piezoelectric stator 10, i.e., a plane in which the XOZ axis shown in fig. 1 is located. The circular motion may be a circular or elliptical trajectory in a first plane.
Referring to fig. 1-3, in some embodiments, the piezoelectric assembly 130 includes a plurality of piezoelectric elements disposed at the first end 111 and the second end 112, respectively, and the friction assembly 120 moves annularly in a first plane or moves annularly in a second plane when different driving signals are applied to the plurality of piezoelectric elements.
In this manner, providing the plurality of piezoelectric elements within the piezoelectric assembly 130 at the first end 111 and the second end 112 allows the intermediate portion 113 to which the friction assembly 120 is connected to better generate vibrations when the piezoelectric elements are applied with different driving signals.
Specifically, the plurality of piezoelectric elements may be a plurality of piezoelectric ceramic plates. A portion of the plurality of piezoelectric elements may be fixedly connected to an end face of the first end portion 111, and another portion of the plurality of piezoelectric elements may be fixedly connected to an end face of the second end portion 112.
The number of piezoelectric elements on the first end 111 may be the same as the number of piezoelectric elements on the second end 112. The piezoelectric element may be plated with electrode forming electrode surfaces in the thickness direction. It is understood that the electrode surface of the piezoelectric element connecting the first end 111 or the second end 112 in the thickness direction is an inner electrode surface. The inner electrode face may be connected to a ground electrode, i.e. to the common terminal of the drive signal. The end of the piezoelectric element opposite to the inner electrode is an outer electrode surface, the outer electrode surface can be connected with a driving signal, the driving signal can be a high-frequency voltage driving signal, and the waveform of the driving signal can comprise but is not limited to sine waves, square waves, triangular waves and the like.
When different driving signals are applied to some or all of the plurality of piezoelectric elements, the piezoelectric elements generate polarization in the thickness direction, thereby driving the first end portion 111 and the second end portion 112 to vibrate, and causing the intermediate portion 113 to vibrate synchronously, thereby causing the friction member 120 connected to the intermediate portion 113 to perform annular movement along the first plane or annular movement along the second plane.
Referring to fig. 1-3, in some embodiments, the piezoelectric elements include a first piezoelectric element 131, a second piezoelectric element 132, a third piezoelectric element 133, a fourth piezoelectric element 134, a fifth piezoelectric element 135, a sixth piezoelectric element 136, a seventh piezoelectric element 137, and an eighth piezoelectric element 138, where the first piezoelectric element 131, the second piezoelectric element 132, the third piezoelectric element 133, and the fourth piezoelectric element 134 are sequentially disposed around a side surface of the first end 111, the first piezoelectric element 131 and the third piezoelectric element 133 are respectively located on opposite sides of the first end 111, and the second piezoelectric element 132 and the fourth piezoelectric element 134 are respectively located on opposite sides of the first end 111.
Thus, the number of the piezoelectric elements is eight, four of the piezoelectric elements are arranged around the first end portion 111 in a pair opposite to each other, and four piezoelectric elements are arranged around the second end portion 112 in a pair opposite to each other, so that the piezoelectric elements can better drive various different stable vibrations generated by the middle portion 113 of the deformation assembly 110.
Specifically, the specific number of piezoelectric elements may be eight, including a first piezoelectric element 131, a second piezoelectric element 132, a third piezoelectric element 133, a fourth piezoelectric element 134, a fifth piezoelectric element 135, a sixth piezoelectric element 136, a seventh piezoelectric element 137, and an eighth piezoelectric element 138.
Taking the deformation assembly 110 as an example, the first end 111 may be a portion of a square structure connected to one side of the middle portion 113, the first end 111 may have four end surfaces, two opposite sides along the Y-axis direction may be fixedly connected with the first piezoelectric element 131 and the third piezoelectric element 133, and two opposite sides along the Z-axis direction may be fixedly connected with the second piezoelectric element 132 and the fourth piezoelectric element 134. Other piezoelectric elements may be fixedly attached to each side of the second end 112.
Referring to fig. 1-3, in some embodiments, a fifth piezoelectric element 135, a sixth piezoelectric element 136, a seventh piezoelectric element 137, and an eighth piezoelectric element 138 are disposed in sequence around the side surface of the second end 112, the fifth piezoelectric element 135 and the seventh piezoelectric element 137 are respectively located on opposite sides of the second end 112, and the sixth piezoelectric element 136 and the eighth piezoelectric element 138 are respectively located on opposite sides of the second end 112.
In this way, the number and positions of the piezoelectric elements disposed on the second end 112 can be the same as those of the first end 111, so that the piezoelectric elements on the first end 111 can be matched to drive the deformation assembly 110 to generate various regular and stable vibrations, and the friction assembly 120 can be better driven to form annular motion in a plane.
Specifically, taking the deformation assembly 110 as an example, the second end 112 may be a portion connected to the other side of the middle portion 113 and having a square structure, the second end 112 may have four end faces, the fifth piezoelectric element 135 and the seventh piezoelectric element 137 may be fixedly connected to two opposite sides along the Y-axis direction, and the sixth piezoelectric element 136 and the eighth piezoelectric element 138 may be fixedly connected to two opposite sides along the Z-axis direction.
Referring to fig. 1-3, in some embodiments, the friction member 120 performs an annular motion in a first plane with the first driving signal applied to the second, fourth, sixth and eighth piezoelectric elements 132, 134, 136 and 138 and the second driving signal applied to the first, third, fifth and seventh piezoelectric elements 131, 133, 135 and 137, the first driving signal being 90 ° out of phase with the second driving signal.
In this way, applying the first driving signals to the four piezoelectric elements along the Z-axis direction on the deformation component 110 and applying the second driving signals to the four piezoelectric elements along the Y-axis direction can make the deformation component 110 generate two kinds of vibration superimposed annular movements, so as to drive the friction component 120 to do annular movements on the first plane.
Specifically, since the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136, and the eighth piezoelectric element 138 are opposite in the height direction of the deformation assembly 110, that is, the second piezoelectric element 132 and the fourth piezoelectric element 134 are opposite in the Z-axis direction of the first end portion 111, the sixth piezoelectric element 136 and the eighth piezoelectric element 138 are opposite in the Z-axis direction of the second end portion 112;
When the first driving signal is applied to the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136 and the eighth piezoelectric element 138, the polarization directions generated by the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136 and the eighth piezoelectric element 138 are all along the positive Z-axis direction, so that the second piezoelectric element 132, the sixth piezoelectric element 136, the fourth piezoelectric element 134 and the eighth piezoelectric element 138 generate opposite stretching effects, and thus the whole deformation assembly 110 is driven to perform bending vibration motion in the Z-axis direction (as shown in fig. 4, the line is a state before the bending vibration motion occurs to the piezoelectric stator 10, and the entity is a state when the bending vibration motion occurs to the piezoelectric stator 10).
Similarly, when the second driving signal is applied to the first piezoelectric element 131, the third piezoelectric element 133, the fifth piezoelectric element 135 and the seventh piezoelectric element 137, the polarization directions generated by the first piezoelectric element 131, the third piezoelectric element 133, the fifth piezoelectric element 135 and the seventh piezoelectric element 137 are all along the positive Y-axis direction, so that the first piezoelectric element 131 and the fifth piezoelectric element 135 generate opposite stretching effects with the third piezoelectric element 133 and the seventh piezoelectric element 137, and thus the bending vibration motion of the whole deformation assembly 110 in the Y-axis direction is driven (as shown in fig. 5, the line is the state before the bending vibration motion of the piezoelectric stator 10, and the entity is the state when the bending vibration motion of the piezoelectric stator 10 occurs).
Further, since the first driving signal and the second driving signal have a phase difference of 90 ° in time, when the first driving signal is applied to the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136, and the eighth piezoelectric element 138, and the second driving signal is applied to the first piezoelectric element 131, the third piezoelectric element 133, the fifth piezoelectric element 135, and the seventh piezoelectric element 137, the bending vibration motion in the Z-axis direction and the bending vibration motion in the Y-axis direction are combined by the deformation component 110.
Thereby forming an annular movement along the YOZ plane in the intermediate portion 113, thereby driving the friction member 120 to perform an annular movement in the first plane (YOZ plane), which may be a circular or elliptical trajectory movement in the first plane.
Referring to fig. 1-3, in some embodiments, when the first driving signal is applied to the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136, and the eighth piezoelectric element 138, the third driving signal is applied to the first piezoelectric element 131, the seventh piezoelectric element 137, and the fourth driving signal is applied to the third piezoelectric element 133, and the fifth piezoelectric element 135, the friction member 120 performs an annular motion in the second plane, and the phase of the first driving signal is different from the phase of the third driving signal by 90 °, and the phase of the third driving signal is different from the phase of the fourth driving signal by 180 °.
In this way, the deformation component 110 can generate two kinds of vibration superimposed annular movements by applying the first driving signals to the four piezoelectric elements along the Z-axis direction on the deformation component 110, and applying the third driving signals to two of the four piezoelectric elements along the X-axis direction and applying the fourth driving signals to the other two of the four piezoelectric elements, so as to drive the friction component 120 to do annular movements on the second plane.
Specifically, since the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136, and the eighth piezoelectric element 138 are opposite in the height direction of the deformation assembly 110, that is, the second piezoelectric element 132 and the fourth piezoelectric element 134 are opposite in the Z-axis direction of the first end portion 111, the sixth piezoelectric element 136 and the eighth piezoelectric element 138 are opposite in the Z-axis direction of the second end portion 112;
When the first driving signal is applied to the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136 and the eighth piezoelectric element 138, the polarization directions generated by the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136 and the eighth piezoelectric element 138 are all along the positive Z-axis direction, so that the second piezoelectric element 132, the sixth piezoelectric element 136 and the fourth piezoelectric element 134 and the eighth piezoelectric element 138 will generate opposite stretching effects, thereby driving the bending vibration motion of the deformation assembly 110 in the Z-axis direction (as shown in fig. 4, the line is the state before the bending vibration motion of the piezoelectric stator 10, and the entity is the state when the bending vibration motion of the piezoelectric stator 10 occurs).
Similarly, when the third driving signal is applied to the first piezoelectric element 131 and the seventh piezoelectric element 137, and simultaneously, when the fourth driving signal is applied to the third piezoelectric element 133 and the fifth piezoelectric element 135, the telescopic effect generated by the first piezoelectric element 131 and the seventh piezoelectric element 137, the third piezoelectric element 133 and the fifth piezoelectric element 135 is caused, and the third driving signal and the fourth driving signal have a phase difference of 180 ° in time, so as to drive the longitudinal vibration motion of the whole deformation assembly 110 in the X-axis direction (as shown in fig. 6, the line is the state before the longitudinal vibration motion of the piezoelectric stator 10, and the entity is the state when the longitudinal vibration motion of the piezoelectric stator 10 occurs).
Further, since the first drive signal and the third drive signal have a phase difference of 90 ° in time, when the first drive signal is applied to the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136, and the eighth piezoelectric element 138, the third drive signal is applied to the first piezoelectric element 131, the seventh piezoelectric element 137, and the fourth drive signal is applied to the third piezoelectric element 133, and the fifth piezoelectric element 135, the bending vibration motion in the Z-axis direction and the longitudinal vibration motion in the X-axis direction are combined by the deformation unit 110.
Thereby forming an annular movement along the XOZ plane in the intermediate portion 113, thereby bringing the friction member 120 to an annular movement in the second plane (XOZ plane), which may be a circular or elliptical trajectory movement in the second plane.
Referring to fig. 1-3, in some embodiments, when the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136, and the eighth piezoelectric element 138 are applied with the first driving signal, the friction element 120 vibrates along the first direction in the first plane, and the first direction is perpendicular to the length direction of the deformation element 110.
In this manner, application of drive signals to the second, fourth, sixth and eighth piezoelectric elements 132, 134, 136 and 138 alone may cause vibration of the deformation assembly 110 in the first direction.
As will be understood with reference to fig. 1 and 2, the deformation assembly 110 may be a strip structure, and the strip structure may have a length-width-height characteristic, and the length direction may be a longitudinal direction on the deformation assembly 110, such as the length direction identified in the figures; the width direction may be a broadside direction on the deformation assembly 110, as identified in the figure; the height direction may be a direction perpendicular to both the long and wide sides on the deformation assembly 110, as identified in the figure.
Specifically, the second piezoelectric element 132 and the fourth piezoelectric element 134 may be disposed on both sides of the first end portion 111 in the height direction of the deformation assembly 110, respectively. The sixth piezoelectric element 136 and the eighth piezoelectric element 138 may be disposed on both sides of the second end portion 112 in the height direction of the deformation assembly 110, respectively.
Under the driving of the first driving signal, the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136 and the eighth piezoelectric element 138 are polarized along the Z-axis direction, and the second piezoelectric element 132, the sixth piezoelectric element 136, the fourth piezoelectric element 134 and the eighth piezoelectric element 138 will generate opposite stretching effects, so as to drive the deformation assembly 110 to generate bending vibration motion in the first direction of the first plane (as shown in fig. 4), and further drive the friction assembly 120 to vibrate along the first direction in the first plane.
It should be understood that the first direction may be a height direction of the deformation assembly 110 perpendicular to a length direction of the deformation assembly 110, and the first direction may be along a Z-axis direction, that is, the first direction may be a Z-axis direction in a first plane (YOZ plane).
Referring to fig. 1-3, in some embodiments, when the first piezoelectric element 131, the third piezoelectric element 133, the fifth piezoelectric element 135, and the seventh piezoelectric element 137 are applied with the second driving signal, the friction element 120 vibrates along the second direction in the first plane, and the second direction is perpendicular to the length direction of the deformation element 110.
In this manner, the application of the driving signals to the first, third, fifth and seventh piezoelectric elements 131, 133, 135 and 137 alone may cause the deformation assembly 110 to vibrate in the second direction.
Specifically, the first piezoelectric element 131 and the third piezoelectric element 133 may be disposed on both sides of the first end portion 111 in the width direction of the deformation assembly 110, respectively. The fifth piezoelectric element 135 and the seventh piezoelectric element 137 may be disposed on both sides of the second end portion 112 in the width direction of the deformation assembly 110, respectively.
Under the driving of the first driving signal, the second piezoelectric element 132, the fourth piezoelectric element 134, the sixth piezoelectric element 136 and the eighth piezoelectric element 138 are polarized along the Z-axis direction, and the second piezoelectric element 132, the sixth piezoelectric element 136, the fourth piezoelectric element 134 and the eighth piezoelectric element 138 generate opposite stretching effects, so as to drive the deformation assembly 110 to generate bending vibration motion in the second direction of the first plane (as shown in fig. 5), and further drive the friction assembly 120 to vibrate along the second direction in the first plane.
It should be appreciated that the second direction may be a width direction perpendicular to the length direction of the deformation assembly 110, and the second direction may be a direction along the Y-axis, i.e., the first direction may be a Y-axis direction in the first plane (YOZ plane).
Referring to fig. 1-3, in some embodiments, when the third driving signal is applied to the first piezoelectric element 131 and the seventh piezoelectric element 137, and the fourth driving signal is applied to the third piezoelectric element 133 and the fifth piezoelectric element 135, the friction assembly 120 vibrates along a third direction, and the third direction is parallel to the length direction of the deformation assembly 110.
Referring to fig. 1-3, in some embodiments, the piezoelectric stator 10 further includes a first end cap 14, where the first end cap 14 is fixedly connected to an end surface of the first end 111; and/or
The piezoelectric stator 10 further includes a second end cap 15, and the second end cap 15 is fixedly connected to an end surface of the second end 112.
In this way, the piezoelectric electrons can stabilize both ends of the deformation assembly 110 by fixedly providing the first end cap 14 and the second end cap 15 on the end surfaces of the first end portion 111 and the second end portion 112, so that the middle portion 113 of the deformation assembly 110 can generate vibration better.
Specifically, the piezoelectric stator 10 may be provided with the end face fixed connection between the first end cover 14 and the first end portion 111 or the end face fixed connection between the second end cover 15 and the second end portion 112, or may be provided with the end face fixed connection between the first end cover 14 and the first end portion 111 and the end face fixed connection between the second end cover 15 and the second end portion 112.
The first end cap 14 may be a metal structural member, and the first end cap 14 may be a rectangular structural body fixedly connected to the first end portion 111 and matching an end surface cross-sectional shape of the first end portion 111. The end surface may be a longitudinal end surface of the deformation assembly 110 on the first end 111. The first end cap 14 may be integrally formed with the deformation assembly 110, or may be integrally connected by glue, welding, soldering, etc.
Similarly, the second end cap 15 may be a metal structural member, and the second end cap 15 may be a rectangular structural body fixedly connected to the second end 112 and matching a cross-sectional shape of the second end 112. The end surface may be the end surface of the second end 112 along the length of the deformation assembly 110. The second end cap 15 may be integrally formed with the deformation assembly 110, or may be integrally connected by glue, welding, soldering, etc.
Referring to fig. 1-3, in some embodiments, the cross-sectional area of the intermediate portion 113 is smaller than the cross-sectional areas of the first end portion 111 and the second end portion 112.
In this way, the cross-sectional area of the middle portion 113 of the deformation assembly 110 is smaller than that of the first end portion 111 and the second end portion 112 at two sides, so that the middle portion 113 can be driven to vibrate more easily when the first end portion 111 and the second end portion 112 vibrate, and the friction assembly 120 can be driven to move better.
Specifically, the cross-sectional area of the middle portion 113 is smaller than the cross-sectional areas of the first end portion 111 and the second end portion 112, and may be an area of the middle portion 113 that is perpendicular to the length direction of the deformation assembly 110, an area of the first end portion 111 that is perpendicular to the length direction of the deformation assembly 110, and an area of the second end portion 112 that is perpendicular to the length direction of the deformation assembly 110.
Referring to fig. 1-3, in some embodiments, the cross-sectional area of the deformation assembly 110 decreases gradually from the first end 111 and the second end 112 toward the middle 113.
In this manner, the decreasing cross-sectional area of the two ends of the deformation assembly 110 toward the middle may reduce the volume of the deformation assembly 110 and thus the volume and production cost of the piezoelectric stator 10.
Specifically, the cross-sectional area of the deformation assembly 110 may be a cross-sectional area of the deformation assembly 110 taken along a direction perpendicular to the length of the deformation assembly 110. That is, the cross-sectional area of the deformation assembly 110 in the first plane (YOZ plane) gradually decreases from the first end portion 111 toward the intermediate portion 113, and gradually decreases from the second end portion 112 toward the intermediate portion 113.
Referring to fig. 7 in combination with fig. 1 to 3, a piezoelectric motor 101 according to an embodiment of the present application includes a piezoelectric stator 10 and a mover 20, wherein the mover 20 abuts against a friction component 120 of the piezoelectric stator 10, and the friction component 120 performs an annular motion on a first plane to drive the mover 20 to linearly move along a length direction perpendicular to the piezoelectric stator 10; the friction member 120 makes an annular motion in the second plane to drive the mover 20 to linearly move in a direction parallel to the length direction of the piezoelectric stator 10;
The piezoelectric motor 101 of the embodiment of the application can drive the mover 20 to linearly move along different directions through a single piezoelectric stator 10, and the piezoelectric motor 101 can be miniaturized due to the fact that one piezoelectric stator 10 is adopted, and the volume of the piezoelectric stator 10 is small and the structure is simple.
Specifically, the mover 20 may abut against the friction member 120 on the piezoelectric stator 10, and it is understood that the friction member 120 may abut against the mover 20 away from the connecting end surface with the middle portion. When the piezoelectric mover 20 is driven by the driving signal to vibrate and drive the friction assembly 120 to do annular motion in the first plane, the friction assembly 120 acts on the mover 20 through friction coupling, and the mover 20 is driven to linearly move along the direction perpendicular to the length direction of the piezoelectric stator 10 through friction force, that is, the mover 20 can linearly move in the Y-axis direction in the first plane (YOZ plane).
When the piezoelectric stator 10 is driven by the driving signal to vibrate so as to drive the friction assembly 120 to do annular motion in the second plane, the friction assembly 120 acts on the mover 20 through friction coupling, and the mover 20 is driven to linearly move along the length direction parallel to the piezoelectric stator 10 through friction force, i.e. the mover 20 can linearly move in the X-axis direction in the second plane (XOZ plane).
Referring to fig. 8, a camera 100 according to an embodiment of the present application includes a piezoelectric motor 101 and a lens 102, where the piezoelectric motor 101 is the piezoelectric motor 101 of the above embodiment, and the mover 20 drives the lens 102 to move linearly.
According to the camera 100 of the embodiment of the application, the piezoelectric motor 101 drives the lens 102 to move along the straight line, so that the functions of automatic focusing, optical anti-shake and the like of the camera 100 can be realized, and the piezoelectric motor 101 is small in size and the height of a camera 100 module can be reduced.
Specifically, the lens 102 of the camera 100 may be disposed on the mover 20 of the piezoelectric motor 101, and when the piezoelectric motor 101 works, the mover 20 may realize linear motion in two directions and drive the lens 102 to move linearly in two directions. The direction of movement of the mover 20 may be two rectilinear movements in mutually perpendicular directions in the plane of the mover 20.
Referring to fig. 9, an electronic device 1000 according to an embodiment of the application includes a camera 100 according to the above embodiment.
The electronic device 1000 according to the embodiment of the application is provided with the camera 100, so that the shooting effect can be improved, the size and the height of the camera 100 are small, and the design attractiveness of the electronic device 1000 can be improved.
Specifically, the electronic apparatus 1000 may be a terminal device having a photographing function. For example, the electronic apparatus 1000 may include a smart phone, a tablet, a computer, a digital camera, or other terminal devices having a photographing function. The camera 100 may be disposed on the electronic device 1000, for example, a rear camera of a mobile phone, a camera of a digital camera, and the like.
In the description of the present specification, reference to the terms "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.
Claims (15)
1. A piezoelectric stator, comprising:
The deformation assembly comprises a first end part, a second end part and a middle part, wherein the first end part and the second end part are positioned on two sides of the middle part;
a friction assembly disposed on the intermediate portion;
the piezoelectric component is arranged at the first end part and/or the second end part, and drives the deformation component to vibrate under the condition that voltage is applied to the piezoelectric component so as to drive the friction component to do annular motion on a first plane or do annular motion on a second plane, and the first plane is not parallel to the second plane.
2. The piezoelectric stator of claim 1, wherein the piezoelectric assembly comprises a plurality of piezoelectric elements disposed at the first end and the second end, respectively, the friction assembly moving annularly in a first plane or annularly in a second plane when different drive signals are applied to the plurality of piezoelectric elements.
3. The piezoelectric stator of claim 2, wherein the piezoelectric elements include a first piezoelectric element, a second piezoelectric element, a third piezoelectric element, a fourth piezoelectric element, a fifth piezoelectric element, a sixth piezoelectric element, a seventh piezoelectric element, and an eighth piezoelectric element, the first piezoelectric element, the second piezoelectric element, the third piezoelectric element, and the fourth piezoelectric element being disposed in sequence around a side surface of the first end, the first piezoelectric element and the third piezoelectric element being disposed on opposite sides of the first end, respectively, and the second piezoelectric element and the fourth piezoelectric element being disposed on opposite sides of the first end, respectively.
4. The piezoelectric stator according to claim 3, wherein the fifth piezoelectric element, the sixth piezoelectric element, the seventh piezoelectric element, and the eighth piezoelectric element are disposed in order around the side face of the second end portion, the fifth piezoelectric element and the seventh piezoelectric element being respectively located on two opposite sides of the second end portion, the sixth piezoelectric element and the eighth piezoelectric element being respectively located on two opposite sides of the second end portion.
5. The piezoelectric stator according to claim 4, wherein the friction member moves circularly in a first plane with a first drive signal applied to the second piezoelectric element, the fourth piezoelectric element, the sixth piezoelectric element, and the eighth piezoelectric element, and a second drive signal applied to the first piezoelectric element, the third piezoelectric element, the fifth piezoelectric element, and the seventh piezoelectric element, the first drive signal being out of phase with the second drive signal by 90 °.
6. The piezoelectric stator according to claim 4, wherein the friction member moves circularly in the second plane with a first drive signal applied to the second piezoelectric element, the fourth piezoelectric element, the sixth piezoelectric element, and the eighth piezoelectric element, a third drive signal applied to the first piezoelectric element, the seventh piezoelectric element, and a fourth drive signal applied to the third piezoelectric element, the first drive signal being out of phase with the third drive signal by 90 ° and the third drive signal being out of phase with the fourth drive signal by 180 °.
7. The piezoelectric stator according to claim 4, wherein the friction member vibrates in a first direction within the first plane, the first direction being perpendicular to a length direction of the deformation member, with the second piezoelectric element, the fourth piezoelectric element, the sixth piezoelectric element, and the eighth piezoelectric element being applied with a first drive signal.
8. The piezoelectric stator of claim 4, wherein the friction assembly vibrates in a second direction within the first plane, the second direction being perpendicular to a length direction of the deformation assembly, with a second drive signal applied to the first piezoelectric element, the third piezoelectric element, the fifth piezoelectric element, and the seventh piezoelectric element.
9. The piezoelectric stator according to claim 4, wherein the friction member vibrates in a third direction parallel to a longitudinal direction of the deformation member when a third driving signal is applied to the first piezoelectric element and the seventh piezoelectric element and a fourth driving signal is applied to the third piezoelectric element and the fifth piezoelectric element.
10. The piezoelectric stator of claim 1, further comprising a first end cap fixedly connected to an end face of the first end portion; and/or
The piezoelectric stator further comprises a second end cover, and the second end cover is fixedly connected with the end face of the second end part.
11. The piezoelectric stator of claim 1, wherein the cross-sectional area of the intermediate portion is smaller than the cross-sectional areas of the first and second end portions.
12. The piezoelectric stator of claim 11, wherein a cross-sectional area of said deformation assembly gradually decreases from said first end portion and said second end portion toward said intermediate portion.
13. A piezoelectric motor, comprising:
The piezoelectric stator of any one of claims 1-12; and
The rotor is abutted with the friction assembly of the piezoelectric stator, and the friction assembly performs annular movement on the first plane to drive the rotor to linearly move along the length direction perpendicular to the piezoelectric stator; the friction component performs annular motion on the second plane to drive the mover to linearly move along the length direction parallel to the piezoelectric stator.
14. A camera, comprising:
the piezoelectric motor of claim 13; and
And the mover drives the lens to move linearly.
15. An electronic device comprising the camera of claim 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211357624.XA CN118041120A (en) | 2022-11-01 | 2022-11-01 | Piezoelectric stator, piezoelectric motor, camera and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211357624.XA CN118041120A (en) | 2022-11-01 | 2022-11-01 | Piezoelectric stator, piezoelectric motor, camera and electronic device |
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| CN118041120A true CN118041120A (en) | 2024-05-14 |
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| CN202211357624.XA Pending CN118041120A (en) | 2022-11-01 | 2022-11-01 | Piezoelectric stator, piezoelectric motor, camera and electronic device |
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| Country | Link |
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| CN (1) | CN118041120A (en) |
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