CN114915206A - Piezoelectric actuating device and terminal - Google Patents
Piezoelectric actuating device and terminal Download PDFInfo
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- CN114915206A CN114915206A CN202210581860.3A CN202210581860A CN114915206A CN 114915206 A CN114915206 A CN 114915206A CN 202210581860 A CN202210581860 A CN 202210581860A CN 114915206 A CN114915206 A CN 114915206A
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- amplifier
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- driving
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- 239000000919 ceramic Substances 0.000 claims abstract description 25
- 230000000694 effects Effects 0.000 claims abstract description 17
- 230000009471 action Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
- H02N2/001—Driving devices, e.g. vibrators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
- H02N2/005—Mechanical details, e.g. housings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
- H02N2/0075—Electrical details, e.g. drive or control circuits or methods
Abstract
The invention relates to the technical field of actuating devices, in particular to a piezoelectric actuating device and a terminal, which comprise a shell, a rotor, two amplifiers and two driving pieces, wherein the driving pieces are made of piezoelectric ceramics; when alternating current flows through the driving piece, the driving piece deforms due to inverse piezoelectric effect, the mover is driven to move back and forth between the two amplifiers in a resonance mode, and the amplitude of the movement of the mover is amplified by the amplifiers so as to achieve the effect of vibration.
Description
Technical Field
The invention relates to the technical field of actuating devices, in particular to a piezoelectric actuating device and a terminal.
Background
Vibration devices for terminals such as mobile phones generally include two types: an ERM (eccentric rotor motor) drives an eccentric wheel to rotate through a motor, and the eccentric wheel rotates to realize vibration; the other is an LRA (linear resonant actuator), an alternating current passes through a coil to generate an alternating magnetic field, and the magnetic field drives a mover containing a permanent magnet to move back and forth along the X-axis direction, so as to achieve a vibration effect. In the two modes, the LRA has the advantages of strong vibration sense, wide frequency response range, quick response and the like compared with the ERM, and can realize rich touch feedback, so that the LRA is more and more favored by manufacturers.
However, the conventional LRA still has the following disadvantages: the structure is complicated, and is with high costs, and it needs the magnetic field of enough excellence to drive when the action, leads to shielding structure and other members' anti-interference requirement higher, and serious can influence the signal of surrounding consumer even, and the energy consumption is higher, obviously can cause the inconvenience to normal production and use.
Disclosure of Invention
The invention provides a piezoelectric actuating device and a terminal aiming at the problems in the prior art, which can still realize the vibration effect without generating a magnetic field, have simple structure and low energy consumption and are easy to realize large-scale mass production.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a piezoelectric actuating device, which comprises a shell, a rotor, two amplifiers and two driving pieces, wherein the driving pieces are made of piezoelectric ceramics, the two driving pieces are both arranged on the shell, the rotor is movably arranged in the shell and positioned between the two driving pieces, two end surfaces of the rotor respectively face the two driving pieces, the two amplifiers are respectively arranged at two sides of the rotor, and the driving pieces are used for being externally connected with an alternating power supply;
when alternating current flows through the driving piece, the driving piece deforms due to inverse piezoelectric effect, the mover is driven to move back and forth between the two amplifiers in a resonance mode, and the amplitude of the movement of the mover is amplified by the amplifiers so as to achieve the effect of vibration.
Furthermore, the shell comprises a first connecting piece, a second connecting piece and two guide rails, the first connecting piece, the second connecting piece and the two guide rails are arranged in an enclosing manner to form a vibration cavity, the rotor and the two amplifiers are arranged in the vibration cavity, and the rotor is arranged on the two guide rails in a sliding manner; the two ends of the amplifier are respectively connected to the two guide rails, the amplifier close to the first connecting piece is connected with the rotor, and the amplifier close to the second connecting piece is connected with the second connecting piece.
Furthermore, one end of the mover close to the first connecting piece is provided with a first connecting part, and the first connecting part is used for being connected with the amplifier; one end of the second connecting piece, which is close to the amplifier, is provided with a second connecting part, and the second butt joint is used for being connected with the amplifier.
Furthermore, the amplifier comprises a connecting part, two amplifying parts and two fixing parts, wherein the connecting part is used for being connected with the mover/second connecting piece, the two amplifying parts are respectively arranged at two ends of the connecting part, and the amplifying parts and the connecting part form an obtuse angle; the two fixing parts are connected with the two amplifying parts in a one-to-one correspondence mode, the fixing parts are arranged at one ends, far away from the connecting parts, of the amplifying parts, and the fixing parts are welded with the guide rails.
Preferably, the amplifier is a spring plate.
Furthermore, the housing further comprises two cover plates, and the two cover plates are respectively used for covering the two openings of the vibration cavity.
Furthermore, limiting blocks are respectively arranged on the sides, opposite to each other, of the two guide rails, limiting grooves are respectively formed in the two ends, close to the guide rails, of the rotor, and the limiting blocks are located in the limiting grooves.
Furthermore, the power supply device also comprises a power connection piece, wherein the power connection piece is provided with an electrode, the two driving pieces are respectively connected to the inner walls of the two ends of the electrode, and the power connection piece is used for being externally connected with an alternating power supply.
Furthermore, the driving part comprises a plurality of ceramic plates which are arranged in a stacking mode, the adjacent ceramic plates are attached to each other, an internal electrode is arranged between each layer of ceramic plate, and two ends of each ceramic plate in the thickness direction are used for being externally connected with an alternating power supply.
The invention also provides a terminal which comprises the piezoelectric braking device.
The invention has the beneficial effects that: the invention utilizes the inverse piezoelectric effect of the piezoelectric ceramics, after the driving piece is rapidly deformed by the alternating current, the mover is driven by the resonance to move back and forth at high frequency, and the high-frequency movement is amplified by the amplifier, thereby achieving the vibration effect without a magnetic field.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic view of the interior of the vibration chamber of the present invention.
Fig. 3 is an exploded view of the present invention.
Fig. 4 is a cross-sectional view of the present invention.
Fig. 5 is a schematic view of the guide rail of the present invention.
Fig. 6 is a schematic diagram of an amplifier of the present invention.
Fig. 7 is a schematic view of another aspect of the amplifier of the present invention.
Fig. 8 is a schematic view of a second connector of the present invention.
Figure 9 is a schematic view of a drive member of the present invention.
Fig. 10 is a schematic view of a mover of the present invention.
Fig. 11 is a schematic diagram of a prior art LRA.
Reference numerals: 1-shell, 2-mover, 3-amplifier, 4-driving piece, 5-electrical connection piece, 6-spring, 11-first connection piece, 12-second connection piece, 13-guide rail, 14-cover plate, 21-first connection part, 22-spacing groove, 31-connection part, 32-amplification part, 33-fixing part, 41-ceramic piece, 51-containing groove, 121-second connection part, 131-spacing block, 132-welding hole.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.
As shown in fig. 1 to 11, the piezoelectric actuator according to the present invention includes a housing 1, a mover 2, two amplifiers 3, and two drivers 4, where the drivers 4 are made of piezoelectric ceramics, the two drivers 4 are both mounted on the housing 1, the mover 2 is movably disposed in the housing 1 and located between the two drivers 4, two end surfaces of the mover 2 respectively face the two drivers 4, the two amplifiers 3 are respectively disposed on two sides of the mover 2, and the drivers 4 are used for externally connecting an alternating power supply.
The invention is applied to terminals such as mobile phones, VR and the like, and the working principle is as follows: the driving piece 4 is made of piezoelectric ceramics, so the driving piece 4 has an inverse piezoelectric effect, when vibration is needed, alternating current flows through the driving piece 4, the driving piece 4 deforms due to the inverse piezoelectric effect, the mover 2 is driven to move back and forth between the two amplifiers 3 along with the deformation of the driving piece 4 in a resonance mode, and under the driving of a proper alternating current frequency, the mover 2 moves back and forth and is continuously amplified due to resonance amplitude, so that the effect of enabling the terminal to vibrate along the X axis is achieved.
In this embodiment, the housing 1 includes a first connecting member 11, a second connecting member 12 and two guide rails 13, the first connecting member 11, the second connecting member 12 and the two guide rails 13 are enclosed to form a vibration cavity, the mover 2 and the two amplifiers 3 are both disposed in the vibration cavity, and the mover 2 is slidably disposed on the two guide rails 13; two ends of the amplifier 3 are respectively connected to the two guide rails 13, the amplifier 3 close to the first connecting piece 11 is connected with the mover 2, and the amplifier 3 close to the second connecting piece 12 is connected with the second connecting piece 12. The two guide rails 13 have a guiding effect on the reciprocating movement of the mover 2, so that the mover 2 can stably move back and forth, and the amplifier 3 can be triggered to vibrate better. Specifically, the amplifier 3 and the mover 2 and the other amplifier 3 and the second connecting member 12 are connected by welding respectively to ensure stability.
Specifically, one end of the mover 2 close to the first connector 11 is provided with a first connector 21, and the first connector 21 is used for connecting with the amplifier 3; one end of the second connecting piece 12 close to the amplifier 3 is provided with a second connecting part 121, and the second connecting part 121 is used for connecting with the amplifier 3.
Through the arrangement of the structure, the amplification of the amplitude of the rotor 2 can be effectively ensured, so that the amplitude amplification effect is ensured.
Specifically, the amplifier 3 includes a connecting portion 31, two amplifying portions 32 and two fixing portions 33, the connecting portion 31 is used for being connected with the mover 2/the second connecting member 12, the two amplifying portions 32 are respectively disposed at two ends of the connecting portion 31, and the amplifying portions 32 and the connecting portion 31 are disposed at an obtuse angle; the two fixing portions 33 are connected to the two enlarged portions 32 in a one-to-one correspondence, the fixing portions 33 are provided at one ends of the enlarged portions 32 away from the connecting portion 31, and the fixing portions 33 are welded to the guide rail 13. Specifically, the guide rail 13 has a welding hole 132, and the fixing portion 33 is welded in the welding hole 132.
The amplifier 3 of the present invention is an elastic sheet, and taking fig. 6 as an example, the ratio between the height a and the width b is very small, so when the mover 2 moves back and forth and a changes, b deforms correspondingly according to the ratio, thereby realizing the amplification of the vibration amplitude.
Further, in the related art, the vibration of the LRA needs to guide not only the mover 2 but also the spring 6 in order to avoid damage to the spring 6 due to deflection when the spring 6 is compressed. Obviously, in the prior art, the volume ratio of the mover 2 is not large (typically only 50%), resulting in a larger LRA being necessary when a stronger vibration is required.
Compared with the spring plate replacing the spring 6, the spring 6 has the advantages that a guide structure required by the spring 6 is omitted, the effect of simplifying the structure is achieved, and in the actual operation process, the ratio of the rotor 2 can be larger (up to more than 80%), so that the amplitude can be improved on the premise of ensuring the unchanged volume, or the thickness is lower on the premise of keeping the amplitude, and the competitiveness is improved.
In particular, the housing 1 further comprises two cover plates 14, and the two cover plates 14 are respectively used for covering two openings of the vibration cavity. The two cover plates 14 are used for ensuring the internal isolation of the invention from the outside, thereby ensuring the driving member 4 and the rotor 2 to work stably.
Specifically, the two guide rails 13 are provided with a limiting block 131 on one side opposite to each other, the two ends of the mover 2 close to the guide rails 13 are provided with a limiting groove 22, and the limiting block 131 is located in the limiting groove 22. The limiting block 131 is matched with the limiting groove 22 to limit the moving amplitude of the rotor 2 back and forth, so that excessive extrusion on the amplifier 3 caused by inertia of the motion of the rotor 2 is avoided, and the stability of the invention is ensured.
In the embodiment, the invention further comprises an electric connecting piece 5, wherein the electric connecting piece 5 is provided with an electrode 51, the two driving pieces 4 are respectively connected to the inner walls of two ends of the electrode 51, and the electric connecting piece 5 is used for externally connecting an alternating power supply. The electric connecting piece 5 is an FPC (flexible printed circuit), and is electrically connected in a mode that the two driving pieces 4 are respectively contacted with the inner walls of the two ends of the electrode 51, so that the magnitude and the direction of current passing through the two driving pieces 4 are the same, the generated inverse piezoelectric effect is also the same, and the driving amplitude and the driving frequency of the rotor 2 are ensured to be the same.
In this embodiment, the driving element 4 may be a single-layer ceramic sheet, or may be composed of a plurality of stacked ceramic pieces 41, adjacent ceramic pieces 41 are attached to each other, the ceramic pieces 41 have internal electrodes, and two ends of the ceramic pieces 41 along the thickness direction are used for externally connecting an alternating power supply. The driving voltage required by the single piezoelectric ceramic sheet 41 is relatively high, and the required driving voltage can be significantly reduced by using the laminated piezoelectric ceramic sheets, so that the piezoelectric ceramic sheet can effectively act under low-voltage driving, and is easier to use in portable equipment taking a battery as a power supply.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A piezoelectric actuator, comprising: the piezoelectric ceramic power amplifier comprises a shell, a rotor, two amplifiers and two driving pieces, wherein the driving pieces are made of piezoelectric ceramics, the two driving pieces are both arranged in the shell, the rotor is movably arranged in the shell and positioned between the two driving pieces, two end surfaces of the rotor are respectively opposite to the two driving pieces, the two amplifiers are respectively arranged on two sides of the rotor, and the driving pieces are used for being externally connected with an alternating power supply;
when alternating current flows through the driving piece, the driving piece deforms due to the inverse piezoelectric effect, the mover is driven to move back and forth between the two amplifiers in a resonance mode, and the amplitude of the action of the mover is amplified by the amplifiers so as to achieve the effect of vibration.
2. The piezoelectric actuator of claim 1, wherein: the shell comprises a first connecting piece, a second connecting piece and two guide rails, the first connecting piece, the second connecting piece and the two guide rails are arranged in an enclosing mode to form a vibration cavity, the rotor and the two amplifiers are arranged in the vibration cavity, and the rotor is arranged on the two guide rails in a sliding mode; the two ends of the amplifier are respectively connected to the two guide rails, the amplifier close to the first connecting piece is connected with the rotor, and the amplifier close to the second connecting piece is connected with the second connecting piece.
3. The piezoelectric actuator of claim 2, wherein: one end of the rotor, which is close to the first connecting piece, is provided with a first connecting part, and the first connecting part is used for being connected with the amplifier; one end of the second connecting piece, which is close to the amplifier, is provided with a second connecting part, and the second abutting part is used for being connected with the amplifier.
4. The piezoelectric actuator of claim 2, wherein: the amplifier comprises a connecting part, two amplifying parts and two fixing parts, wherein the connecting part is used for being connected with the mover/second connecting piece, the two amplifying parts are respectively arranged at two ends of the connecting part, and the amplifying parts and the connecting part are arranged in an obtuse angle; the two fixing parts are connected with the two amplifying parts in a one-to-one correspondence mode, the fixing parts are arranged at one ends, far away from the connecting parts, of the amplifying parts, and the fixing parts are welded with the guide rails.
5. The piezoelectric actuator of claim 4, wherein: the amplifier is a spring plate.
6. The piezoelectric actuator of claim 2, wherein: the housing further comprises two cover plates for covering two openings of the vibration chamber, respectively.
7. The piezoelectric actuator of claim 2, wherein: the two guide rails are provided with limiting blocks on the sides opposite to each other, the two ends of the rotor close to the guide rails are provided with limiting grooves respectively, and the limiting blocks are located in the limiting grooves.
8. The piezoelectric actuator of claim 1, wherein: the power supply device is characterized by further comprising a power connection piece, wherein the power connection piece is provided with an electrode, the two driving pieces are respectively connected to the inner walls of the two ends of the electrode, and the power connection piece is used for being externally connected with an alternating power supply.
9. The piezoelectric actuator of claim 1, wherein: the driving part comprises a plurality of ceramic plates, the ceramic plates are arranged in a stacking mode, adjacent ceramic parts are attached to each other, an internal electrode is arranged between each layer of ceramic plate, and two ends of each ceramic plate in the thickness direction are used for being externally connected with an alternating power supply.
10. A terminal, characterized by: comprising a piezoelectric braking device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210581860.3A CN114915206A (en) | 2022-05-26 | 2022-05-26 | Piezoelectric actuating device and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210581860.3A CN114915206A (en) | 2022-05-26 | 2022-05-26 | Piezoelectric actuating device and terminal |
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| Publication Number | Publication Date |
|---|---|
| CN114915206A true CN114915206A (en) | 2022-08-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210581860.3A Pending CN114915206A (en) | 2022-05-26 | 2022-05-26 | Piezoelectric actuating device and terminal |
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| Country | Link |
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| CN (1) | CN114915206A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212379813U (en) * | 2020-04-29 | 2021-01-19 | 欧菲微电子技术有限公司 | Vibration feedback unit, touch vibration feedback module and electronic equipment |
| CN112968627A (en) * | 2021-03-29 | 2021-06-15 | 维沃移动通信有限公司 | Vibration device, vibration control method, and electronic apparatus |
| CN113258823A (en) * | 2021-05-17 | 2021-08-13 | 维沃移动通信有限公司 | Vibration motor and electronic device |
| WO2022006844A1 (en) * | 2020-07-10 | 2022-01-13 | 欧菲光集团股份有限公司 | Tactile feedback unit, tactile feedback device and electronic apparatus |
| CN218071335U (en) * | 2022-05-26 | 2022-12-16 | 深圳市密姆科技有限公司 | X-axis linear motor |
-
2022
- 2022-05-26 CN CN202210581860.3A patent/CN114915206A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212379813U (en) * | 2020-04-29 | 2021-01-19 | 欧菲微电子技术有限公司 | Vibration feedback unit, touch vibration feedback module and electronic equipment |
| WO2022006844A1 (en) * | 2020-07-10 | 2022-01-13 | 欧菲光集团股份有限公司 | Tactile feedback unit, tactile feedback device and electronic apparatus |
| CN112968627A (en) * | 2021-03-29 | 2021-06-15 | 维沃移动通信有限公司 | Vibration device, vibration control method, and electronic apparatus |
| CN113258823A (en) * | 2021-05-17 | 2021-08-13 | 维沃移动通信有限公司 | Vibration motor and electronic device |
| CN218071335U (en) * | 2022-05-26 | 2022-12-16 | 深圳市密姆科技有限公司 | X-axis linear motor |
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