Piezoelectric driving device and lens module
Through the combined driving method of the first piezoelectric element and the second piezoelectric element, the elliptical motion of the friction member is realized, solving the problems of complex structure and high precision requirements in the prior art, and reducing production costs.
Patent Information
- Application Number
- CN202422205074.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-09-08
- Filing Date
- 2024-09-09
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-09-09
AI Technical Summary
In the prior art, piezoelectric drive devices have complex structures and high requirements for parts accuracy in precision motion platforms, resulting in high production costs.
The first piezoelectric element and the second piezoelectric element jointly drive the friction member to generate elliptical motion, and the first piezoelectric element drives the shrapnel to generate S-shaped twists and the second piezoelectric element drives the shrapnel to arch up and down, and comprehensively realizes the elliptical motion of the friction member to drive the carrier movement.
The structure of the piezoelectric drive device is simplified, the accuracy requirements of parts are reduced, and the cost of large-scale production is reduced.
Smart Images
Figure CN223274021U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of precision motion platforms, in particular to a piezoelectric drive device and a lens module. Background Art
[0002] Precision motion technology is the core technology of automation systems. In precision motion platforms, the importance of drive devices is self-evident. As precision motion platforms improve device stability and positioning accuracy, the application of piezoelectric drive devices is becoming more and more extensive. Utility Model Content
[0003] The purpose of the utility model is to provide a lens driving device to solve the problems existing in the above-mentioned prior art.
[0004] In order to solve the above problems, according to the first aspect of the present invention, a piezoelectric drive device is provided, which includes a first piezoelectric element, a second piezoelectric element, a spring, a friction member and a carrier.
[0005] The first piezoelectric element and the second piezoelectric element are connected to the top surface and the bottom surface of the elastic sheet respectively, the bottom end of the friction member is connected to the top surface of the elastic sheet and the top end of the friction member is in contact with the carrier.
[0006] The first piezoelectric element and the second piezoelectric element jointly drive the top end of the friction member to generate an elliptical motion, thereby driving the carrier to move along a first direction.
[0007] Preferably, the first piezoelectric element drives the spring to produce S-shaped twisting, thereby driving the top end of the friction member to produce a swinging motion along the first direction, and the second piezoelectric element drives the spring to produce an up and down arching motion along a direction perpendicular to the plane of the spring, thereby driving the friction member to move along a direction perpendicular to the plane of the spring.
[0008] Preferably, the piezoelectric driving device includes two first piezoelectric elements, and the two first piezoelectric elements are respectively arranged on both sides of the friction member and located above the second piezoelectric element.
[0009] Preferably, one end of the two first piezoelectric elements close to the friction member contacts the friction member, and one end of the two first piezoelectric elements away from the friction member is aligned with two ends of the second piezoelectric element respectively.
[0010] Preferably, the driving voltages of the two first piezoelectric elements are Vsin(wt) and -Vsin(wt), and the driving voltage of the second piezoelectric element is Vsin(wt+θ), where V is the maximum voltage value in volts, t is time in seconds, w is the angular frequency of the current in radians / second, and θ is the initial phase.
[0011] Preferably, the piezoelectric driving device further includes a fixing member, and both ends of the elastic sheet are respectively connected to the fixing member.
[0012] Preferably, the orientation of the first direction depends on the phase of the driving frequency of the second piezoelectric element.
[0013] Preferably, the piezoelectric driving device further includes a base, the base is provided with the fixing portion, and the elastic sheet is fixedly connected to the fixing portion of the base.
[0014] Preferably, a pressure piece is provided at the upper end of the carrier, and the pressure piece applies pressure to the carrier to increase the pressure of the friction piece on the carrier.
[0015] According to a second aspect of the present invention, a lens module is provided, comprising the piezoelectric drive device described in any one of the above items and a lens, wherein the lens is mounted on the carrier.
[0016] The beneficial effect of the present invention is that, through the combined effect of the two motion modes of the first piezoelectric element and the second piezoelectric element, the top end of the friction member can be caused to produce an elliptical motion, thereby driving the carrier to move in the first direction. This piezoelectric drive device has a simplified structure and lowers the precision requirements of the components, thereby reducing costs during large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic front view of a piezoelectric drive device according to an embodiment of the present invention;
[0018] Figure 2a Schematic diagram of the motion of the friction member of the first embodiment of the present invention, wherein the phase of the driving voltage frequency of the second piezoelectric element is 120;
[0019] Figure 2b Schematic diagram of the motion of the friction member of the second embodiment of the present invention, wherein the phase of the driving voltage frequency of the second piezoelectric element is -60;
[0020] Figure 2c Schematic diagram of the motion of the friction member of the third embodiment of the present invention, wherein the phase of the driving voltage frequency of the second piezoelectric element is 150;
[0021] Figure 2d3 is a schematic diagram of the movement of the friction member of the fourth embodiment of the present invention, wherein the phase of the driving voltage frequency of the second piezoelectric element is -30. DETAILED DESCRIPTION
[0022] The following will be combined with the accompanying drawings to describe the preferred embodiments of the present invention in detail so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.
[0023] In the following description, for the purpose of illustrating the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
[0024] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.
[0025] In the following description, in order to clearly demonstrate the structure and working mode of the present invention, many directional words will be used for description, but words such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and should not be understood as restrictive terms.
[0026] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.
[0027] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0028] An embodiment of the present invention provides a piezoelectric drive device, referring to Figure 1 The piezoelectric drive device 1 includes a first piezoelectric element 11, a second piezoelectric element 12, a spring 13, a friction member 14 and a carrier 15. The first piezoelectric element 11 and the second piezoelectric element 12 are respectively connected to the top and bottom surfaces of the spring 13. The bottom end of the friction member 14 is connected to the top surface of the spring 13 and the top end of the friction member 14 abuts against the carrier 15. The first piezoelectric element 11 and the second piezoelectric element 12 jointly drive the top end of the friction member 14 to generate an elliptical motion, thereby driving the carrier 15 to move along the first direction.
[0029] It should be noted that, referring to Figure 1 The first direction can be the direction of arrow A or the direction of arrow B. The "movement to the left" or "left" mentioned below is the "direction of arrow A", and the "movement to the right" or "right" is the "direction of arrow B".
[0030] In addition, the piezoelectric drive device of the present invention can be applied to automation components such as lenses and precision instruments.
[0031] This design, through the combined effect of the two motion modes of the first piezoelectric element 11 and the second piezoelectric element 12, can cause the top end of the friction member 14 to generate an elliptical motion, thereby driving the carrier 15 to move in the first direction. This piezoelectric drive device has a simplified structure and lowers the precision requirements of its components, thus reducing costs during large-scale production.
[0032] In one embodiment of the present invention, referring to Figure 1 The first piezoelectric element 11 drives the spring 13 to produce S-shaped twisting, thereby driving the top of the friction member 14 to produce a swinging motion along the first direction, and the second piezoelectric element 12 drives the spring 13 to produce an up and down arching motion along a direction perpendicular to the plane of the spring 13, thereby driving the friction member 14 to move along a direction perpendicular to the plane of the spring 13.
[0033] It should be noted that, referring to Figure 1 , “the direction perpendicular to the plane of the spring” is the direction of arrow C.
[0034] Specifically, the first piezoelectric element 11 and the second piezoelectric element 12 apply sinusoidal waves of different phases, which drive the top of the friction member 14 to produce elliptical motion, thereby driving the carrier 15 to move. The first piezoelectric element 11 causes the spring 13 to produce an S-shaped twist, which in turn drives the top of the friction member 14 to produce a rocking motion in a first direction, that is, a left-right rocking motion. The second piezoelectric element 12 causes the spring 13 to produce an up-and-down arching motion perpendicular to the plane of the spring 13, driving the friction member 14 to produce an up-and-down motion perpendicular to the plane of the spring 13. Therefore, the combination of these two motion modes results in an elliptical motion of the top of the friction member 14.
[0035] In one embodiment of the present invention, referring to Figure 1 The piezoelectric driving device 1 includes two first piezoelectric elements 11 . The two first piezoelectric elements 11 are respectively arranged on both sides of the friction member 14 and above the second piezoelectric element 12 .
[0036] Specifically, refer to Figure 1 The two first piezoelectric elements 11 and the second piezoelectric element 12 each apply sinusoidal waves of different phases, causing the top of the friction member 14 to produce elliptical motion, which in turn drives the carrier 15 to move. The two first piezoelectric elements 11 cause the spring 13 to produce an S-shaped twist, which in turn drives the top of the friction member 14 to produce a rocking motion in the first direction, that is, a left-right rocking motion. The second piezoelectric element 12 causes the spring 13 to produce an up-and-down arching motion perpendicular to the plane of the spring 13, driving the friction member 14 to move up and down in a direction perpendicular to the plane of the spring 13. Therefore, the combination of these two motion patterns results in an elliptical motion of the top of the friction member 14.
[0037] In one embodiment of the present invention, referring to Figure 1 One end of the two first piezoelectric elements 11 close to the friction member 14 contacts the friction member 14 , and one end of the two first piezoelectric elements 11 away from the friction member 14 is aligned with both ends of the second piezoelectric element 12 .
[0038] In one embodiment of the present invention, referring to Figure 1 The driving voltages of the two first piezoelectric elements 11 are Vsin(wt) and -Vsin(wt), and the driving voltage of the second piezoelectric element 12 is Vsin(wt+θ), where V is the maximum voltage value in volts; t is the time in seconds; w is the angular frequency of the current in radians / second; θ is the initial phase (also called the initial phase angle), which determines the starting state of the sinusoidal quantity.
[0039] Specifically, when the driving signal of the second piezoelectric element 12 is in a certain phase, the elliptical motion trajectory of the friction member 14 includes the four positions described below: at position 1, the friction member 14 contacts the carrier 15 and squeezes the carrier 15, driving the carrier 15 to move to the right (or left); at position 2, the friction member 14 reaches the highest point, then detaches from the carrier 15 and moves to the left (or right); after passing the 3 / 4 position, the friction member 14 detaches from the carrier 15 and moves to the left (or right) to the maximum value; finally, it returns to position 1 and repeatedly pushes the carrier 15 to the right (or left).
[0040] For example, refer to Figure 2a , the horizontal axis is the first direction of movement, the vertical axis is the direction of movement perpendicular to the plane of the spring, when the phase of the driving signal of the second piezoelectric element 12 is 120, the top movement curve of the friction member 14 is as follows Figure 2a The friction member 14 drives the carrier 15 to move to the left from position 1, moves the carrier 15 to the right from position 2, separates from the carrier 15 at position 3 and moves to the right to the maximum value, and finally returns to position 1 and repeatedly pushes the carrier 15 to the left.
[0041] For example, refer to Figure 2b , the horizontal axis is the first direction of movement, the vertical axis is the direction of movement perpendicular to the plane of the spring, when the phase of the driving signal of the second piezoelectric element 12 is -60, the motion curve of the top of the friction member 14 is as follows Figure 2b The friction member 14 drives the carrier 15 to move rightward from position 1, moves leftward from position 2, separates from the carrier 15 at position 3 and moves leftward to the maximum value, and finally returns to position 1, and repeatedly pushes the carrier 15 to the right.
[0042] For example, refer to Figure 2c , the horizontal axis is the first direction of movement, the vertical axis is the direction of movement perpendicular to the plane of the spring, when the phase of the driving signal of the second piezoelectric element 12 is 150, the motion curve of the top of the friction member 14 is as follows Figure 2c The friction member 14 drives the carrier 15 to move to the left from position 1, moves the carrier 15 to the right from position 2, separates from the carrier 15 at position 3 and moves to the right to the maximum value, and finally returns to position 1 and repeatedly pushes the carrier 15 to the left.
[0043] For example, refer to Figure 2d , the horizontal axis is the first direction of movement, the vertical axis is the direction of movement perpendicular to the plane of the spring, when the phase of the driving signal of the second piezoelectric element 12 is -30, the top movement curve of the friction member 14 is as follows Figure 2d The friction member 14 drives the carrier 15 to move rightward from position 1, moves leftward from position 2, separates from the carrier 15 at position 3 and moves leftward to the maximum value, and finally returns to position 1 and repeatedly pushes the carrier 15 to the right.
[0044] In one embodiment of the present invention, referring to Figure 1 , the orientation of the first direction depends on the phase of the driving frequency of the second piezoelectric element 12.
[0045] It should be noted that the "first direction" is the direction of arrow A or the direction of arrow B. It can be understood that the "direction of arrow A" is "moving left" or "left", and the "direction of arrow B" is "moving right" or "right". Figure 2a 、 Figure 2b 、 Figure 2c as well as Figure 2d As can be seen from the description, when the phase of the driving signal of the second piezoelectric element 12 is positive, the orientation of the first direction is the direction of arrow A, and when the phase of the driving signal of the second piezoelectric element 12 is negative, the orientation of the first direction is the direction of arrow B.
[0046] In one embodiment of the present invention, the piezoelectric driving device further includes a fixing member (not shown in the figure), and both ends of the elastic sheet are respectively connected to the fixing member.
[0047] In one embodiment of the present invention, referring to Figure 1 The piezoelectric driving device 1 further includes a base 16 , the base 16 is provided with a fixing portion 161 , and the spring 13 is fixedly connected to the fixing portion 161 of the base 16 .
[0048] In one embodiment of the present invention, referring to Figure 1 A pressure piece (not shown in the figure) is provided at the upper end of the carrier 15 , and the pressure piece applies pressure to the carrier 15 to increase the pressure of the friction piece 14 on the carrier 15 .
[0049] An embodiment of the present invention provides a lens module, characterized in that the lens module includes the piezoelectric drive device of any one of the above embodiments (implementations) and a lens, and the lens is installed on a carrier.
[0050] It should be noted that, in the lens module, the "first direction" is the "first direction on the plane perpendicular to the optical axis", that is, in the lens module, the piezoelectric drive device includes a first piezoelectric element, a second piezoelectric element, a spring, a friction member and a carrier, the first piezoelectric element and the second piezoelectric element are respectively connected to the top and bottom surfaces of the spring, the bottom end of the friction member is connected to the top surface of the spring and the top end of the friction member is in contact with the carrier, and the top end of the friction member is driven by the first piezoelectric element and the second piezoelectric element to produce an elliptical motion, thereby driving the carrier to move in the first direction on the plane perpendicular to the optical axis.
[0051] Through such a design, the lens module has an optical image stabilization function. Specifically, the first piezoelectric element and the second piezoelectric element jointly drive the top of the friction member to produce elliptical motion, drive the carrier to move along a first direction on a plane perpendicular to the optical axis, and then drive the lens in the carrier to move along the first direction on a plane perpendicular to the optical axis.
[0052] In addition, in the lens module, "along the direction of the plane perpendicular to the spring" is the "optical axis direction", that is, the first piezoelectric element drives the spring to produce S-shaped twisting, thereby driving the top end of the friction member to produce a swinging motion along the first direction on the plane perpendicular to the optical axis, and the second piezoelectric element drives the spring 13 to produce an up and down arch motion along the optical axis direction, thereby driving the friction member to move along the optical axis direction.
[0053] While the preferred embodiments of the present invention have been described in detail above, it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. Such equivalent forms also fall within the scope of the claims appended hereto.
Claims
1. A piezoelectric drive device, characterized in that: The piezoelectric drive device includes a first piezoelectric element, a second piezoelectric element, a spring, a friction member and a carrier. The first piezoelectric element and the second piezoelectric element are connected to the top surface and the bottom surface of the elastic sheet respectively, the bottom end of the friction member is connected to the top surface of the elastic sheet and the top end of the friction member is in contact with the carrier. The first piezoelectric element and the second piezoelectric element jointly drive the top end of the friction member to generate an elliptical motion, thereby driving the carrier to move along a first direction.
2. The piezoelectric drive device according to claim 1, wherein: The first piezoelectric element drives the spring to produce S-shaped twisting, thereby driving the top end of the friction member to produce a swinging motion along the first direction, and the second piezoelectric element drives the spring to produce an up and down arching motion along a direction perpendicular to the plane of the spring, thereby driving the friction member to move along a direction perpendicular to the plane of the spring.
3. The piezoelectric drive device according to claim 1, wherein: The piezoelectric driving device includes two first piezoelectric elements, which are respectively arranged on both sides of the friction member and located above the second piezoelectric element.
4. The piezoelectric drive device according to claim 3, wherein: One end of the two first piezoelectric elements close to the friction member contacts the friction member, and one end of the two first piezoelectric elements away from the friction member is aligned with two ends of the second piezoelectric element respectively.
5. The piezoelectric drive device according to claim 3, wherein: The driving voltages of the two first piezoelectric elements are Vsin(wt) and -Vsin(wt), and the driving voltage of the second piezoelectric element is Vsin(wt+θ), where V is the maximum voltage value in volts, t is time in seconds, w is the angular frequency of the current in radians / second, and θ is the initial phase.
6. The piezoelectric drive device according to claim 1, wherein: The piezoelectric driving device further includes a fixing member, and both ends of the elastic sheet are respectively connected to the fixing member.
7. The piezoelectric drive device according to claim 6, wherein: The orientation of the first direction depends on the phase of the driving frequency of the second piezoelectric element.
8. The piezoelectric drive device according to claim 1, wherein: The piezoelectric driving device further includes a base, the base is provided with a fixing portion, and the elastic sheet is fixedly connected to the fixing portion.
9. The piezoelectric driving device according to claim 1, wherein: A pressure piece is provided at the upper end of the carrier, and pressure is applied to the carrier by the pressure piece to increase the pressure of the friction piece on the carrier.
10. A lens module, characterized in that: The lens module comprises the piezoelectric drive device according to any one of claims 1 to 9 and a lens, and the lens is mounted on the carrier.