CN117175969A - Eccentric magnetic attraction type piezoelectric driving device - Google Patents
Eccentric magnetic attraction type piezoelectric driving device Download PDFInfo
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- CN117175969A CN117175969A CN202311232769.1A CN202311232769A CN117175969A CN 117175969 A CN117175969 A CN 117175969A CN 202311232769 A CN202311232769 A CN 202311232769A CN 117175969 A CN117175969 A CN 117175969A
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Abstract
The application discloses an eccentric magnetic piezoelectric driving device, which comprises a shell, a base and a carrier, wherein the shell and the base form a hollow cavity; the base is provided with a piezoelectric mechanism which is arranged at one side part of the carrier and provided with a friction block, and the carrier is provided with a friction plate which is contacted with the friction block; the base is also provided with a magnet mounting plate which is arranged on the same side of the carrier provided with the piezoelectric mechanism; the magnet mounting plate is provided with an adsorption magnet, and the magnet mounting plate is close to the piezoelectric mechanism. In the technical scheme of the application, the adsorption force generated by the magnetic element is biased to the friction block, and the reaction force acting on the friction column is larger than the reaction force of the anti-rotation structure because of the biasing of the adsorption force. The anti-rotation structure has small reaction force, which means that the invalid friction force is small, so that the effective thrust generated by the friction block and the friction plate is increased, and the driving speed and the driving efficiency are improved.
Description
Technical Field
The application belongs to the technical field of optical components and relates to an eccentric magnetic attraction type piezoelectric driving device for driving a lens.
Background
In recent years, it has become common to mount a small-sized camera on a portable device typified by a mobile phone. A lens driving device, which is a main component of an imaging mechanism mounted on the small portable device, is used for auto-focusing for capturing a still image or a moving image, and a function required for the lens driving device is small-sized and high-precision driving.
In handheld photographing, it is significant to effectively prevent image shake, because the probability of blurring of an image due to shake increases. To compensate for the vibration of the fuselage, a particularly sensitive smooth impact drive mechanism (SIDM-Smooth Impact Drive Mechanism) has been developed by the skilled person, which is a drive mechanism using a piezoelectric element, a solid fixed part at one end of the piezoelectric element being attached to the other end of the drive friction part, and the drive friction force being held on the moving body to the member. SIDM is characterized by compactness, high precision and quiet drive, while the challenges faced by SIDM include inefficiency, durability, and the need for post sensors for feed, among others.
As japanese patent JP2010052050W there is provided a SIDM based drive device comprising: a piezoelectric element that expands and contracts in response to an applied voltage; a columnar drive shaft formed of a composite material including a resin and a fiber bundle, having a piezoelectric element attached to one end thereof, and being displaced by expansion and contraction of the piezoelectric element; a base member for supporting the piezoelectric element or the drive shaft; and a movable body frictionally engaged with the drive shaft and movable in an axial direction of the drive shaft.
Also, as in US 2008/023690, the elastic force of a plate spring is used to generate the friction force of two piezoelectric actuators, and the friction force is generated between the guide rail and the lens sleeve. However, the plate spring is not suitable for small lens modules due to the complex structure, large volume and large space.
With the popularity of terminals such as smartphones, it is a positive consideration for those skilled in the art to simplify the lens driving structure built in these terminals to obtain a better driving force and simplify the assembly process.
Disclosure of Invention
The application aims to provide an eccentric magnetic type piezoelectric driving device for driving a lens, which is used for solving the technical problems of the prior art described in the background art.
In order to achieve the above object, the present application provides the following solutions:
according to one aspect of the present application, there is provided an eccentric magnetically attracted piezoelectric actuator comprising a housing, a base, and a carrier, the housing and the base forming a hollow cavity, the carrier being adapted to mount a lens and to move longitudinally within the hollow cavity;
wherein: the base is provided with a piezoelectric mechanism, the piezoelectric mechanism is arranged on one side part of the carrier and is provided with a friction block, and the carrier is provided with a friction plate which is contacted with the friction block;
and: the base is also provided with a magnet mounting plate and an anti-rotation structure, the magnet mounting plate is arranged on the same side of the carrier, provided with the piezoelectric mechanism, and the anti-rotation structure and the piezoelectric mechanism are arranged at intervals;
wherein: the magnet mounting plate is provided with an adsorption magnet and is arranged close to the piezoelectric mechanism, and the adsorption magnet and the magnetic conduction piece on the carrier generate adsorption force and are matched with each other.
In some embodiments, the friction plate is made of a metallic material and serves as the magnetic conductive member.
The friction plate is of a V-shaped structure provided with two wing plates.
Furthermore, the two wing plates of the friction plate adopt an asymmetric structure.
In some embodiments, the first wing plate of the friction plate in the direction of the magnet mounting plate is larger than the second wing plate in the other direction.
As a further preferable aspect, the first wing plate of the friction plate in the direction of the magnet mounting plate extends so as to be laminated on the carrier by the magnet mounting plate.
In some embodiments, the magnet mounting plate is provided with a mounting seat for placing the induction magnet, and the mounting seat is provided with a back baffle for separating the induction magnet from the first wing plate; the mounting seat is provided with a side baffle in the direction away from the piezoelectric mechanism, and a gap is reserved between the side baffle and the back baffle.
In some embodiments, a limiting pier is further arranged on the base, and the limiting pier and the magnet mounting plate clamp the piezoelectric mechanism from two sides.
In some embodiments, an anti-rotation structure is disposed on the base, and the anti-rotation structure is a ball anti-rotation mechanism or a guide post.
In some embodiments, the position of the magnet mounting plate on the base is located between the anti-rotation structure and the piezoelectric mechanism and is close to the piezoelectric mechanism.
According to the technical scheme, the magnet mounting plate is moved towards the direction of the piezoelectric mechanism, meanwhile, the friction plate is designed to be a metal friction plate and is prolonged, part of the metal friction plate is used as a magnetic conduction piece, attractive force is generated between the metal friction plate and the adsorption magnet, and friction force between the friction plate and the piezoelectric mechanism is increased.
On the other hand, the design of magnetic conduction spare has been omitted in this structure to compare the design that the absorption magnetite set up at carrier side middle part, because the absorption magnetite is close to piezoelectricity mechanism, reduced the attraction loss that leads to from, the attraction of absorption magnetite in this structure is more easily transmitted between piezoelectricity mechanism and the carrier, has better result of use.
In the technical scheme of the application, the adsorption force generated by the magnetic element is biased to the friction block, and the reaction force acting on the friction column is larger than the reaction force of the anti-rotation structure because of the biasing of the adsorption force. The anti-rotation structure has small reaction force, which means that the invalid friction force is small, so that the effective thrust generated by the friction block and the friction plate is increased, and the driving speed and the driving efficiency are improved.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings of the embodiments will be briefly described below.
The drawings described below are only for illustration of some embodiments of the application and are not intended to limit the application.
In the drawings:
FIG. 1 is a schematic view of a structure in embodiment 1 of the present application;
FIG. 2 is a schematic illustration of the structure of FIG. 1 shown with the base and carrier disassembled;
FIG. 3 is a structure of the application in embodiment 1 shown with all parts disassembled;
FIG. 4 is a disassembled enlarged view of the main parts of embodiment 1 of the present application;
FIG. 5 is an assembled large-scale view of the main parts of embodiment 1 of the present application;
FIG. 6 is a schematic diagram of a piezoelectric mechanism;
FIG. 7 is a schematic diagram of driving force calculation using a non-eccentric magnetic attraction structure;
fig. 8 is a schematic diagram of driving force calculation using an eccentric magnetic attraction structure in embodiment 1 of the present application.
The marks in the drawings are: the device comprises a 1-shell, a 2-base, a 3-carrier, a 4-piezoelectric mechanism, a 5-ball anti-rotation mechanism, a 6-adsorption magnet, a 7-magnet mounting plate, a 71-side baffle, a 72-back baffle, a 73-mounting seat, an 8-friction plate, 81-first wing plates, 82-second wing plates, 9-induction magnets, a 10-position sensor, 11-limiting plates, 12-limiting piers, 13-friction blocks, 14-deformation blocks and 15-balancing weights.
Detailed Description
The preferred embodiments of the present application will be described in detail below with reference to the attached drawings, so that the objects, features and advantages of the present application will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the application, but rather are merely illustrative of the true spirit of the application.
In the following description, for the purposes of explanation of various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment may be practiced without one or more of the specific details. In other instances, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
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, appearances of the phrases "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 suitable manner in one or more embodiments.
In the following description, for the purposes of clarity of presentation of the structure and manner of operation of the present application, the description will be made with the aid of directional terms, but such terms as "forward," "rearward," "left," "right," "outward," "inner," "outward," "inward," "upper," "lower," etc. are to be construed as convenience, and are not to be limiting.
The application relates to an eccentric magnetic piezoelectric driving device which is mainly used for electronic equipment such as mobile phones, tablet computers and the like to realize functions of photographing, video recording and the like. The lens zoom lens is characterized by comprising a shell, a base and a carrier, wherein the shell and the base form a hollow cavity; the base is provided with a piezoelectric mechanism, the piezoelectric mechanism is arranged on one side portion of the carrier and is provided with a friction block, the carrier is provided with a friction plate to be in contact with the friction block, the base is further provided with a magnet mounting plate and an anti-rotation structure, the magnet mounting plate is arranged on the same side of the carrier, which is provided with the piezoelectric mechanism, the anti-rotation structure is arranged at intervals with the piezoelectric mechanism, the magnet mounting plate is provided with an adsorption magnet and is close to the piezoelectric mechanism, and adsorption force is generated between the adsorption magnet and a magnetic conduction piece on the carrier and is matched with the adsorption magnet. It can be seen that, in the technical scheme of the application, the adsorption force generated by the magnetic element is biased to the friction block, and the reaction force acting on the friction column is greater than the reaction force of the anti-rotation structure because of the biasing of the adsorption force.
Example 1:
in this embodiment, the eccentric magnetic piezoelectric driving device mainly comprises a housing 1, a base 2, a carrier 3, a piezoelectric mechanism 4, a ball anti-rotation mechanism 5 and the like, wherein the housing 1 and the base 2 form a hollow cavity, the carrier 3 moves longitudinally in the hollow cavity, a lens is mounted on the carrier 3, and the lens moves along with the carrier 3 to realize zooming operation of the lens.
The prior art features of the lens are not shown in the above structures, only the improvements of the present application are shown.
In connection with the exploded views of the components shown in fig. 2 and 3, it can be seen that most of the components of the application are mounted on the carrier 3 and the base 2, the housing 1 being merely an auxiliary component. The base 2 is provided with a piezoelectric mechanism 4, the piezoelectric mechanism is arranged on one side part of the carrier 3 and is provided with a friction block, the carrier 3 is provided with a friction plate 8 which is in contact with the friction block, the base 2 is also provided with a magnet mounting plate 12, the magnet mounting plate 12 is arranged on the same side of the carrier 3, which is provided with the piezoelectric mechanism 4, the magnet mounting plate 7 is provided with an adsorption magnet 6, and the magnet mounting plate is close to the piezoelectric mechanism 4.
The piezoelectric mechanism 4 is disposed on one side of the carrier 3, as can be seen from fig. 2, a V-shaped groove matching with the outline of the friction plate 8 is disposed on the carrier 3, and an arc-shaped fitting structure matching with the outline of the friction plate 8 is disposed on one side of the columnar structure formed by the piezoelectric mechanism 4, which is close to the friction plate 8. The structure of the piezoelectric mechanism 4 is shown in fig. 6. In the present embodiment, the piezoelectric mechanism 4 includes a weight 15, a deformation block 14, and a friction block 13. In other embodiments, the weight 15 may be selectively used.
The friction plate 8 is made of a metal material. The friction plate 8 is of a V-shaped structure provided with two wing plates. The two wing plates of the friction plate 8 adopt an asymmetric structure. The first wing 81 of the friction plate 8 in the direction of the magnet mounting plate 7 is larger than the second wing 82 in the other direction. Specifically, the first wing 81 of the friction plate 8 in the direction of the magnet mounting plate 7 extends so as to be overlapped on the carrier 3 by the magnet mounting plate 7.
The magnet mounting plate 7 is provided with a mounting seat 73 for placing the induction magnet 6, and the mounting seat 73 is provided with a back baffle 72 for separating the induction magnet 6 from the first wing plate 81; the mount 73 is provided with a side shield 71 in a direction away from the piezoelectric mechanism 4, and a gap is provided between the side shield 71 and the back shield 72.
The base 2 is also provided with a limiting pier 12, and the limiting pier 12 and the magnet mounting plate 7 clamp the piezoelectric mechanism 4 from two sides.
The working principle of the design is as follows: the deformation block 14 can generate deformation after being electrified to enable the friction block 13 to longitudinally move, the friction plate 8 with a V-shaped structure is arranged on one side of the carrier 3, and after the friction block 13 in the piezoelectric mechanism 4 is contacted with the friction plate 8, the carrier 3 longitudinally moves along with the friction block 13 under the action of friction force.
Referring to fig. 4-5, a magnet mounting plate 7 is disposed on one side of the base 2, an adsorption magnet 6 is mounted on the magnet mounting plate 7, and a first wing plate 81 of the friction plate 8 extends and is clamped between the back baffle 72 and the carrier 3, and because the friction plate 8 adopts a metal structure, attractive force is generated between the first wing plate 81 and the adsorption magnet 6, so that the carrier 3 can be driven to move.
As shown in fig. 2 and 3, a limiting plate 7 is disposed on one side of the base 2, and a position sensor 11 is disposed inside the limiting plate 7 and cooperates with an induction magnet 6 disposed on one side of the carrier 3 to monitor the position of the carrier 3.
As shown in fig. 2 and 3, a ball anti-rotation mechanism 5 is provided at one side of the carrier 3, which can prevent deflection during the longitudinal movement of the carrier 3.
In fig. 2, the magnet mounting plate 12, the piezoelectric mechanism 4, and the ball anti-rotation mechanism 5 are located on the same side of the base 2 or the carrier 3, and on the side, the piezoelectric mechanism 4 and the ball anti-rotation mechanism 5 are located on both sides of the magnet mounting plate 12, and the magnet mounting plate 12 is close to the piezoelectric mechanism 4 and is far from the ball anti-rotation mechanism 5, thereby forming an eccentric magnetic structure.
The principle of the technical effect achieved by the eccentric magnetic structure of the application is explained below by comparison. As shown in fig. 7, in the case of using a non-eccentric magnetic attraction structure:
the friction side friction coefficient is u1, the distance from the magnetic attraction force FM is d, the anti-rotation side friction coefficient is u2, and the distance from the magnetic attraction force FM is d, so that R1=R2=FM/2=R can be obtained
Then: friction side friction f1=u1×r, anti-rotation side friction f2=u2×r
Effective driving friction force f=r (u 1-u 2) (u 1> u 2)
The effective driving force is small.
As shown in fig. 8, in the case of adopting the eccentric magnetic attraction structure of the present application:
the friction coefficient is u1, the distance from the magnetic attraction force FM is d1, the rotation preventing friction coefficient is u2, the distance from the magnetic attraction force FM is d2, and R1= (d 2/d 1) ×R2 (d 2> > d1, so R1> R2) can be obtained
Then: friction side friction f1=u1×r1, anti-rotation side friction f2=u2×r2
Effective driving friction force f=r1×u1-r2×u2 (u 1> u 2)
The effective driving force is greatly improved.
The foregoing has shown and described the basic principles and main features of the present application and the advantages of the present application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present application, and various changes and modifications may be made without departing from the spirit and scope of the application, which is defined in the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.
Claims (10)
1. The eccentric magnetic piezoelectric driving device is characterized by comprising a shell (1), a base (2) and a carrier (3), wherein the shell (1) and the base (2) form a hollow cavity, and the carrier (3) is used for installing a lens and longitudinally moving in the hollow cavity; wherein the method comprises the steps of
The base (2) is provided with a piezoelectric mechanism (4), the piezoelectric mechanism (4) is arranged at one side part of the carrier (3) and is provided with a friction block (13), the carrier (3) is provided with a friction plate (8) which is contacted with the friction block (13), and
the base (2) is also provided with a magnet mounting plate (12) and an anti-rotation structure, the magnet mounting plate (12) is arranged on the same side of the carrier (3) provided with the piezoelectric mechanism (4), the anti-rotation structure is arranged at intervals with the piezoelectric mechanism, and the anti-rotation structure is arranged at intervals, wherein
The magnet mounting plate (7) is provided with an adsorption magnet (6) and is arranged close to the piezoelectric mechanism (4), and adsorption force is generated between the adsorption magnet (6) and the magnetic conduction piece on the carrier and is matched with the adsorption magnet.
2. The eccentric magnetically attracted piezoelectric actuator according to claim 1, wherein the friction plate (8) is made of a metallic material and serves as the magnetic conductive member.
3. The eccentric magnetic attraction type piezoelectric driving device according to claim 1, wherein the friction plate (8) is of a V-shaped structure provided with two wing plates.
4. An eccentric magnetically attracted piezoelectric actuator according to claim 3 wherein the two wings of the friction plate (8) are of asymmetric configuration.
5. The eccentric magnetically attracted piezoelectric actuator according to claim 3, wherein the first wing (81) of the friction plate (8) in the direction of the magnet mounting plate (7) is larger than the second wing (82) in the other direction.
6. An eccentric magnetically attractable piezoelectric actuator according to claim 3, wherein the first wing (81) of the friction plate (8) in the direction of the magnet mounting plate (7) extends to be laminated by the magnet mounting plate (7) on the carrier (3).
7. The eccentric magnetically attractable piezoelectric actuator according to claim 6, wherein the magnet mounting plate (7) is provided with a mounting seat (73) for receiving the induction magnet (6), the mounting seat (73) being provided with a back baffle (72) for separating the induction magnet (6) from the first wing (81); the mounting seat (73) is provided with a side baffle (71) in a direction away from the piezoelectric mechanism (4), and a gap is formed between the side baffle (71) and the back baffle (72).
8. The eccentric magnetic piezoelectric driving device according to claim 7, wherein a limiting pier (12) is further arranged on the base (2), and the limiting pier (12) and the magnet mounting plate (7) clamp the piezoelectric mechanism (4) from two sides.
9. The eccentric magnetically attractable piezoelectric driving device according to claim 1, wherein the anti-rotation structure is a ball anti-rotation mechanism (5) or a guide post (20).
10. The eccentric magnetically attracted piezoelectric actuator of claim 4 wherein the position of the magnet mounting plate (7) on the base (2) is between the anti-rotation structure and the piezoelectric mechanism (4) and adjacent to the piezoelectric mechanism (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311232769.1A CN117175969A (en) | 2023-09-21 | 2023-09-21 | Eccentric magnetic attraction type piezoelectric driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311232769.1A CN117175969A (en) | 2023-09-21 | 2023-09-21 | Eccentric magnetic attraction type piezoelectric driving device |
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| Publication Number | Publication Date |
|---|---|
| CN117175969A true CN117175969A (en) | 2023-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311232769.1A Pending CN117175969A (en) | 2023-09-21 | 2023-09-21 | Eccentric magnetic attraction type piezoelectric driving device |
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| CN (1) | CN117175969A (en) |
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- 2023-09-21 CN CN202311232769.1A patent/CN117175969A/en active Pending
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