CN217587735U - Piezoelectric driving assembly and camera driving device - Google Patents
Piezoelectric driving assembly and camera driving device Download PDFInfo
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- CN217587735U CN217587735U CN202221939992.0U CN202221939992U CN217587735U CN 217587735 U CN217587735 U CN 217587735U CN 202221939992 U CN202221939992 U CN 202221939992U CN 217587735 U CN217587735 U CN 217587735U
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Abstract
The utility model relates to a piezoelectric drive subassembly and drive arrangement that makes a video recording, piezoelectric drive subassembly includes: a movable optical unit: comprises a lens carrier and a lens arranged in the lens carrier; an extension part is arranged on the side surface of the lens carrier; a vibrator unit: for driving the movable optical unit to move; a pre-pressing unit: the pre-pressing magnet is arranged in the extension part of the lens carrier, a lower friction plate is arranged on the top surface of the extension part, a groove for placing a friction bar is formed in the top of the lower friction plate, an upper friction plate is arranged on one side, away from the lens carrier, of the extension part, the upper friction plate extends upwards and is bent to be in contact with the friction bar, and the upper friction plate and the pre-pressing magnet attract each other to pre-press the friction bar; the utility model discloses use piezoceramics to replace traditional magnetite and coil structure, can realize the large stroke displacement, the effect of focusing is better.
Description
Technical Field
The utility model belongs to the technical field of the optical element drive, concretely relates to piezoelectricity drive assembly and drive arrangement that makes a video recording.
Background
Because a Voice Coil Motor (VCM) has the advantages of simple structure, small volume, low energy consumption, no noise, high acceleration, fast response speed, accurate displacement, low price and the like, the automatic focusing function of the Voice Coil Motor is still the scheme with the highest cost performance for the automatic focusing device of the camera at present; the optical lens is fixed on the voice coil motor carrier, the carrier serves as a power unit for lens movement, the voice coil motor carrier is connected with the stator part through the reed, and when the motor is electrified, the carrier linearly moves along the optical axis direction of the lens, so that the automatic focusing and focusing functions are realized.
In this process, there are the following problems: most of existing voice coil motors adopt magnets and coils as driving, the requirement on arrangement space is high, otherwise, enough thrust to a carrier cannot be guaranteed, however, the internal volume of the voice coil motor is relatively large under the condition that set thrust is achieved, and the design requirements that electronic products using the voice coil motor are gradually light, thin and small are not met, and therefore the thrust of the existing voice coil motors is always restricted by the structure.
SUMMERY OF THE UTILITY MODEL
To prior art not enough, the utility model provides a piezoelectric drive subassembly, include:
movable optical unit 1: comprises a lens carrier 1.1 and a lens 1.2 arranged in the lens carrier 1.1; the side surface of the lens carrier 1.1 is provided with an extension part 1.3;
the vibrator unit 2: the vibrator unit 2 comprises a friction rod 2.1, one end of the friction rod 2.1, an elastic body 2.3 and piezoelectric ceramics 2.4 are fixedly connected in sequence;
a pre-pressing unit 3: the pre-pressing mechanism is used for providing pre-pressing force for the vibrator unit 2 and comprises a pre-pressing magnet 3.1 arranged inside an extending portion 1.3 of a lens carrier 1.1, a lower friction plate 3.2 is arranged on the top surface of the extending portion 1.3, a groove 3.3 for placing a friction rod 2.1 is formed in the top of the lower friction plate 3.2, an upper friction plate 3.4 is arranged on one side, away from the lens carrier 1.1, of the extending portion 1.3, the upper friction plate 3.4 extends upwards and is bent to be in contact with the friction rod 2.1, and the upper friction plate 3.4 and the pre-pressing magnet 3.1 attract each other to pre-press the friction rod 2.1.
Furthermore, two ends of the friction rod 2.1 are respectively sleeved with a limiting ring 2.2.
Furthermore, the shape of the elastic body 2.3 is arc-shaped, the convex part of the elastic body 2.3 is fixedly connected with one end of the friction rod 2.1, and the opening part of the elastic body 2.3 clamps the piezoelectric ceramic 2.4; the piezoelectric ceramic 2.4 is provided with an electrode 2.5.
Further, the piezoelectric ceramic 2.4 is a laminated piezoelectric ceramic.
Furthermore, the shape of the elastic body 2.3 is cymbal shape, the number is one or two, the elastic body 2.3 is respectively arranged at one side or two sides of the piezoelectric ceramic 2.4, and the convex part of the elastic body 2.3 is fixedly connected with one end of the friction rod 2.1.
Furthermore, the section of the piezoelectric ceramic 2.4 is the same as the largest section of the elastic body 2.3, and the areas of the sections are matched.
Furthermore, a circuit board 2.6 is further arranged on the elastic body 2.3, and the circuit board 2.6 is used for connecting an alternating current signal source.
Furthermore, the circuit board 2.6 is provided with a terminal 2.6.1 and a welding end 2.6.2, so that external components can be conveniently accessed.
Furthermore, the top of the upper friction plate 3.4 is provided with a prepressing magnetic attraction plate 3.5, and the prepressing magnetic attraction plate 3.5 and the prepressing magnet 3.1 attract each other to prepress the friction rod 2.1.
An image pickup driving device includes:
base 4: comprises a bottom plate 4.1 and a retaining wall 4.2;
a housing: the light guide plate is covered on the base 4 and forms a cavity with the base 4, and the shell is provided with a light through hole;
the piezoelectric drive assembly of any one of claims 1-9: the movable optical unit 1 is slidably mounted on the base 4 and is arranged on the same optical axis with the light through hole, and the movable optical unit 1 can move along the direction of the optical axis.
The beneficial effects of the utility model reside in that:
1. the utility model discloses use piezoceramics drive arrangement to replace the magnetite and the coil structure of traditional voice coil motor, effectively avoided magnetic interference, effectively overcome the defects such as the thrust of traditional voice coil motor is not enough, the displacement volume is not enough, magnetite interference, can realize the large stroke displacement;
2. the utility model discloses use magnetism to inhale pre-compaction structure and provide the pre-pressure for the friction stick, it is more nimble to compare shell fragment or elastic sleeve pre-compaction structure among the prior art, avoids the pre-pressure undersize or too big, and the effect of focusing is better.
Drawings
Fig. 1 is a schematic perspective view of a piezoelectric driving assembly according to an embodiment of the present invention;
fig. 2 is an exploded schematic view of a piezoelectric driving assembly according to an embodiment of the present invention;
fig. 3 is a schematic perspective view of a stacked vibrator unit according to an embodiment of the present invention;
fig. 4 is a schematic perspective view of a cymbal-shaped vibrator unit according to an embodiment of the present invention;
fig. 5 is a schematic perspective view of a cymbal-shaped vibrator unit of a rectangular cymbal according to an embodiment of the present invention;
fig. 6 is a schematic perspective view of a circuit board portion of a cymbal-shaped vibrator unit according to an embodiment of the present invention;
fig. 7 is a schematic perspective view of a camera driving device according to an embodiment of the present invention;
fig. 8 is an exploded schematic view of a camera driving device according to an embodiment of the present invention;
in the drawing, 1 is a movable optical unit, 1.1 is a lens carrier, 1.2 is a lens, 1.3 is an extension portion, 2 is a vibrator unit, 2.1 is a friction bar, 2.2 is a retainer ring, 2.3 is an elastic body, 2.4 is a piezoelectric ceramic, 2.5 is an electrode, 2.6 is a circuit board, 2.6.1 is a terminal, 2.6.2 is a welding terminal, 3 is a pre-pressing unit, 3.1 is a pre-pressing magnet, 3.2 is a lower friction plate, 3.3 is a groove, 3.4 is an upper friction plate, 3.5 is a pre-pressing magnetic attraction plate, 4 is a base, 4.1 is a bottom plate, 4.2 is a retaining wall, 4.3 is a protrusion, 5 is a fixed optical unit, 6 is a sensing unit, 6.1 is a capacitor plate, 6.2 is a capacitor plate, 6.3 is a ball, 6.4 is a chute, and 6.5 is a metal groove.
Detailed Description
Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.
In this embodiment, as shown in fig. 1-2, a piezoelectric driving assembly includes a movable optical unit 1, a vibrator unit 2, and a magnetic preloading unit 3;
movable optical unit 1: comprises a lens carrier 1.1 and a lens 1.2 embedded in the lens carrier 1.1; the lower parts of the side surfaces of the two sides of the lens carrier 1.1 respectively extend outwards to form extension parts 1.3 which are integrated with the lens carrier 1.1.
The vibrator unit 2: is divided into a laminated vibrator unit and a cymbal-shaped vibrator unit and is used for driving the movable optical unit 1 to move;
laminated vibrator unit: as shown in fig. 3, the friction bar comprises a friction bar 2.1, a spacing ring 2.2, an elastic body 2.3 and laminated piezoelectric ceramics 2.4; the limiting ring 2.2 is an annular structure with a through hole in the middle, and two ends of the friction rod 2.1 are respectively sleeved with one limiting ring 2.2 and fixed; the elastic body 2.3 is in an arc shape, a convex part of the elastic body 2.3 is fixedly connected with one end of the friction rod 2.1, and the upper end and the lower end of the opening part are respectively fixedly connected with any two opposite surfaces of the laminated piezoelectric ceramic 2.4; one surface of the laminated piezoelectric ceramic 2.4, which is far away from the convex part of the elastic body 2.3, is provided with an electrode 2.5;
cymbal-shaped vibrator unit: as shown in fig. 4-6, comprises a friction rod 2.1, a spacing ring 2.2, an elastic body 2.3 and a piezoelectric ceramic 2.4; the limiting ring 2.2 is an annular structure with a through hole in the middle, and two ends of the friction rod 2.1 are respectively sleeved with one limiting ring 2.2 and fixed; the elastic body 2.3 is in the shape of a round cymbal or a rectangular cymbal, the number of the elastic bodies can be one or two, when the number of the elastic bodies is one, the elastic body 2.3 is arranged between the piezoelectric ceramic 2.4 and the friction rod 2.1, the convex part of the elastic body 2.3 is fixedly connected with one end of the friction rod 2.1, and the plane part is fixedly connected with the piezoelectric ceramic 2.4; when the number of the elastic bodies 2.3 is two, the plane parts of the elastic bodies 2.3 are oppositely arranged, two sides of the piezoelectric ceramics 2.4 are fixedly connected with the plane parts to form a multilayer structure, and the convex part of one elastic body 2.3 is fixedly connected with one end of the friction rod 2.1; the section of the piezoelectric ceramic 2.4 is the same as the maximum section of the elastic body 2.3 in shape and equal in area;
still be provided with circuit board 2.6 on cymbal shape oscillator unit's the elastomer 2.3, circuit board 2.6 is used for connecting outside alternating current signal source, and the laminating of a face of circuit board 2.6 and elastomer 2.3's a bellying part, be provided with wiring end 2.6.1 and a plurality of solder joint 2.6.2 on the circuit board 2.6, conveniently insert external component.
Magnetically inhale pre-pressing unit 3: the device is used for providing pre-pressure for a friction rod 2.1 in a vibrator unit 2 and comprises a pre-pressing magnet 3.1 arranged inside an extending part 1.3 on one side of a movable optical unit 1, a lower friction plate 3.2 is arranged on the top surface of the extending part 1.3, a half groove 3.3 used for placing the friction rod 2.1 is formed in the top of the lower friction plate 3.2, the half groove 3.3 is in friction contact with the friction rod 2.1, an upper friction plate 3.4 is arranged on one side, away from a lens carrier 1.1, of the extending part 1.3, the upper friction plate 3.4 extends upwards and is bent towards one side where the friction rod 2.1 is located, the lower surface of the upper friction plate 3.4 is in friction contact with the friction rod 2.1, and the upper friction plate 3.4 and the pre-pressing magnet 3.1 attract each other to pre-press the friction rod 2.1;
furthermore, a prepressing magnetic attraction piece 3.5 is arranged at the top of the bending section of the upper friction plate 3.4 of the magnetic attraction prepressing unit 3, and the prepressing magnetic attraction piece 3.5 and the prepressing magnet 3.1 attract each other to prepress the friction rod 2.1, so that the prepressing force is further enhanced.
In this embodiment, an imaging drive device, as shown in fig. 7 to 8, includes:
two sets of piezoelectric drive components according to claims 1-9;
a base 4: comprises a bottom plate 4.1 and a retaining wall 4.2; the bottom plate 4.1 is internally provided with a metal reinforcing piece and a metal material belt which are integrally formed by injection molding, and the bottom plate 4.1 is also provided with a clamping part which is used for clamping and fixing the metal material belt and the bottom plate 4.1; the metal reinforcing piece is used for improving the strength of the base 4, and the metal material belt is used for conducting signals; the bottom parts of two end surfaces of the retaining wall 4.2 extend outwards to form bulges 4.3, the bulges 4.3 are positioned outside the chamber, and PIN PINs are arranged on the bulges 4.3 and are used as terminal leading-out areas; two side surfaces of the retaining wall 4.2 are provided with hole digging grooves;
a housing: the cover is arranged on the base 4 and forms a cavity with the base 4, the middle parts of the side surfaces of the two sides of the shell are respectively provided with a light through hole, and the position of the light through hole corresponds to the position of the hole digging groove.
Fixing the optical unit 5: the device comprises two groups of fixed lenses arranged in a hole digging groove, wherein the light through hole, the hole digging groove, the fixed lenses and the movable optical unit 1 are arranged on the same optical axis.
The sensing unit 6: the voice coil motor is used for focusing; the capacitor comprises a capacitor sheet 6.1 arranged on one side surface of an extension part 1.3, and two end surfaces of a retaining wall 4.2 are respectively provided with a capacitor plate 6.2 corresponding to the capacitor sheet 6.1; the capacitor plate 6.2 is divided into two parts in the axial direction, under the movement that the lens carrier 1.1 drives the capacitor plate 6.1, the areas of the two parts of the capacitor plate 6.1 corresponding to the capacitor plate 6.2 are different, so that different amounts of electric charge are accumulated, a certain capacitance difference is formed, after an external device connected with the voice coil motor performs differential signal operation, a feedback signal is sent to the voice coil motor, so that the positions of the lens carrier 1.1 and the lens 1.2 carried by the lens carrier are judged, and the driving current is adjusted again according to the feedback signal, so that the focusing function of the voice coil motor is realized;
the first scheme is as follows:
a second groove is formed in the bottom of the extension part 1.3, and a ball 6.3 is arranged in the second groove in a rolling mode; a first groove is formed in the bottom plate 4.1, a sliding groove 6.4 is formed in the bottom wall of the first groove, a metal groove 6.5 matched with the sliding groove is formed in the sliding groove 6.4, the ball 6.3 is in rolling connection with the metal groove 6.5, the positioning and guiding effects are achieved in the moving process of the lens carrier 1.1, the friction force between the lens carrier 1.1 and the base 4 is reduced, the displacement precision and speed of the lens carrier 1.1 are improved, and therefore accurate and rapid focusing of the voice coil motor is achieved;
the bottom of the extension part 1.3 is also provided with a clamping groove, a first magnet is arranged in the clamping groove, and the first magnet and the metal reinforcing part generate magnetic attraction force for prepressing the ball 6.3;
the end part of the metal groove 6.5 extends outwards to form a PIN foot for connecting an external element; a metal plate is pressed between the second groove and the ball 6.3, the metal plate is communicated with the capacitor sheet 6.1, and an electric signal is transmitted to the capacitor sheet 6.1 through the PIN foot and the metal groove 6.5, the ball 6.3 and the metal plate in sequence; the specific electrical connection relationship is as follows: two parts of the capacitor plate 6.2 are respectively extended to form PIN feet, one end of the metal material belt is extended to form the PIN feet, the other end of the metal material belt is in contact with the friction rod 2.1, and each PIN foot is used for being connected with an external element to transmit an electric signal;
the lateral wall of first recess is equipped with one or more openings, and spacing ring 2.2 sets up in the opening, stability when can improving friction stick 2.1 motion.
Scheme II:
a second groove is formed in the bottom of the extension portion 1.3, a first groove is formed in the bottom plate 4.1, a sliding groove 6.4 is formed in the bottom wall of the first groove, a positioning rod is arranged in the sliding groove 6.4, the second groove is slidably buckled with the positioning rod, a metal plate is arranged between the second groove and the positioning rod in a pressing mode, and the metal plate and the capacitor piece 6.1 are communicated; the sliding groove 6.4 is provided with one or more openings, one end of the metal material belt is connected to the positioning rod through the opening, the other end of the metal material belt extends to form a PIN foot, and the electric signal is transmitted to the capacitor chip 6.1 through the metal material belt, the positioning rod and the metal plate in sequence; the positioning rod plays a role in positioning and guiding in the moving process of the lens carrier 1.1, reduces the friction force between the lens carrier 1.1 and the base 4, and improves the displacement precision and speed of the lens carrier 1.1, thereby realizing accurate and rapid focusing of the motor;
a clamping groove is further formed in the bottom of the extension portion 1.3, a first magnet is arranged in the clamping groove, and the first magnet and the metal reinforcing piece generate magnetic attraction force for prepressing the positioning rod;
the limiting ring 2.2 is arranged in the opening, so that the stability of the friction rod 2.1 during movement can be improved;
in this embodiment, the working principle of the piezoelectric driving component is as follows: the corresponding frequency alternating current signals with corresponding phase differences are connected into the vibrator unit 2 (the laminated vibrator unit is connected with the electrode 2.5 on the laminated piezoelectric ceramic 2.4, and the cymbal-shaped vibrator unit is connected with the circuit board 2.6), because the phase differences of high-frequency voltages loaded by each partition of the piezoelectric ceramic 2.4 are different, the piezoelectric ceramic 2.4 can extend or shorten to different degrees, continuous and rapid change is generated between the maximum extension state and the minimum shortening state, the corresponding elastic body 2.3 can deform, and further the friction rod 2.1 vibrates, and the friction rod 2.1, the upper friction plate 3.4 and the lower friction plate 3.2 perform friction motion to drive the movable optical unit 1 to perform linear motion along the corresponding direction of the camera optical axis. The motion direction of the standing wave is changed by changing the phase difference of the high-frequency alternating current signals of the two input circuits of the vibrator unit 2, so that the movable optical unit 1 is changed to move linearly along the direction opposite to the shooting optical axis.
It should be noted that all directional indicators (such as upper, lower, inner, outer, top, bottom, 8230; \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components in a specific posture (as shown in the drawings), etc., and if the specific posture is changed, the directional indicator is changed accordingly.
It will also be understood that when an element is referred to as being "secured" or "disposed" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.
Claims (10)
1. A piezoelectric drive assembly, comprising:
a movable optical unit: comprises a lens carrier and a lens arranged in the lens carrier; an extension part is arranged on the side surface of the lens carrier;
a vibrator unit: the vibrator unit comprises a friction rod, one end of the friction rod, an elastic body and piezoelectric ceramics are fixedly connected in sequence;
a pre-pressing unit: the pre-pressing magnet pre-pressing device is used for providing pre-pressing force for the vibrator unit and comprises a pre-pressing magnet arranged inside the extension part of the lens carrier, a lower friction plate is arranged on the top surface of the extension part, a groove for placing a friction rod is formed in the top of the lower friction plate, an upper friction plate is arranged on one side, away from the lens carrier, of the extension part, the upper friction plate extends upwards and bends and is used for contacting the friction rod, and the upper friction plate and the pre-pressing magnet attract each other to pre-press the friction rod.
2. A piezoelectric drive assembly as in claim 1, wherein: and two ends of the friction rod are respectively sleeved with a limiting ring.
3. A piezoelectric drive assembly according to claim 1, wherein: the elastic body is in an arc shape, the convex part of the elastic body is fixedly connected with one end of the friction rod, and the opening part of the elastic body clamps the piezoelectric ceramic; the piezoelectric ceramic is provided with electrodes.
4. A piezoelectric drive assembly as in claim 3, wherein: the piezoelectric ceramics are laminated piezoelectric ceramics.
5. A piezoelectric drive assembly according to claim 1, wherein: the elastic bodies are cymbal-shaped, the number of the elastic bodies is one or two, the elastic bodies are respectively arranged on one side or two sides of the piezoelectric ceramics, and the convex parts of the elastic bodies are fixedly connected with one end of the friction rod.
6. A piezoelectric drive assembly according to claim 5, wherein: the section of the piezoelectric ceramic is the same as the largest section of the elastic body in shape and the areas of the piezoelectric ceramic and the elastic body are matched.
7. A piezoelectric drive assembly as in claim 6, wherein: the elastic body is also provided with a circuit board which is used for connecting an alternating current signal source.
8. A piezoelectric drive assembly as in claim 7, wherein: the circuit board is provided with a wiring end and a welding end, and external components can be conveniently accessed.
9. A piezoelectric drive assembly according to claim 1, wherein: the top of the upper friction plate is provided with a pre-pressing magnetic attraction piece, and the pre-pressing magnetic attraction piece and the pre-pressing magnet attract each other to pre-press the friction rod.
10. An image pickup drive device, comprising:
base: comprises a bottom plate and a retaining wall;
a housing: the light guide plate is covered on the base and forms a cavity with the base, and the shell is provided with a light through hole;
the piezoelectric drive assembly of any one of claims 1-9: but portable optical element slidable mounting is on the base, but portable optical element and logical unthreaded hole set up with the optical axis and can follow the optical axis direction and remove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221939992.0U CN217587735U (en) | 2022-07-26 | 2022-07-26 | Piezoelectric driving assembly and camera driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221939992.0U CN217587735U (en) | 2022-07-26 | 2022-07-26 | Piezoelectric driving assembly and camera driving device |
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| Publication Number | Publication Date |
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| CN217587735U true CN217587735U (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221939992.0U Active CN217587735U (en) | 2022-07-26 | 2022-07-26 | Piezoelectric driving assembly and camera driving device |
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| CN (1) | CN217587735U (en) |
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- 2022-07-26 CN CN202221939992.0U patent/CN217587735U/en active Active
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A piezoelectric driving component and a camera driving device Effective date of registration: 20231228 Granted publication date: 20221014 Pledgee: China Construction Bank Corporation Panjin branch Pledgor: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Registration number: Y2023210000359 |
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