CN-122026742-A - Clamping mechanism for piezoelectric driving assembly, optical driving device and camera module

CN122026742ACN 122026742 ACN122026742 ACN 122026742ACN-122026742-A

Abstract

The invention provides a clamping mechanism for a piezoelectric driving assembly, an optical driving device and a camera module, wherein the clamping mechanism comprises a piezoelectric elastic piece, the piezoelectric elastic piece comprises at least two elastic arms, a clamping gap is formed between the two elastic arms at intervals and used for clamping a piezoelectric driving shaft and in friction fit with the piezoelectric driving shaft to transmit driving force, one end of the reliable elastic piece is fixedly connected with the piezoelectric elastic piece, the other end of the reliable elastic piece is directly or indirectly connected with a carrier, the carrier is used for bearing a lens of the lens assembly, and the elastic coefficient of the reliable elastic piece is larger than that of the piezoelectric elastic piece. The optical driving device and the camera shooting module comprise the clamping mechanism.

Inventors

LI CHAOYANG
ZHANG YOU
YU LINTAO
JING BINJIE

Assignees

睿恩光电有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (10)

1. A clamping mechanism for a piezoelectric drive assembly, comprising: the piezoelectric elastic sheet comprises at least two elastic arms, a clamping gap and a driving force transmission mechanism, wherein the two elastic arms are arranged at intervals and form a clamping gap and are used for clamping a piezoelectric driving shaft and are in friction fit with the piezoelectric driving shaft to transmit driving force, and the driving force transmission mechanism comprises a piezoelectric elastic sheet, a driving force transmission mechanism and a driving force transmission mechanism One end of the reliable elastic sheet is fixedly connected with the piezoelectric elastic sheet, the other end of the reliable elastic sheet is directly or indirectly connected with a carrier, and the carrier is used for bearing a lens of the lens assembly; the elastic coefficient of the reliable elastic sheet is larger than that of the piezoelectric elastic sheet.
2. The clamping mechanism for a piezoelectric driving assembly according to claim 1, wherein the piezoelectric spring plate comprises four elastic arms, wherein the extending direction of at least one elastic arm and the extending directions of the other elastic arms are staggered in space, so that the four elastic arms jointly enclose to form the clamping gap.
3. The clamping mechanism for a piezoelectric actuation assembly of claim 2, wherein the piezoelectric spring further comprises a bonding pad, four of the spring arms are formed by extending from the bonding pad, and one end of the reliability spring is bonded to the bonding pad.
4. The clamping mechanism for a piezoelectric drive assembly of claim 1, wherein at least one of said resilient arms has a positioning V-shaped groove formed therein for positioning and receiving said piezoelectric drive shaft.
5. The clamping mechanism for a piezo-electric drive assembly according to claim 1, wherein at least one of the elastic arms is provided with a hollowed-out structure.
6. The clamping mechanism for a piezo actuator assembly of claim 1, wherein the reliability dome comprises a dome body and a cushion disposed at the other end of the dome body, the cushion being configured to connect to the carrier.
7. The clamping mechanism for a piezoelectric actuation assembly of claim 6, wherein the spring body comprises: A first force arm, one end of which is fixedly connected with the piezoelectric spring plate, and And the second force arm is formed by extending the other end of the first force arm and is positioned on a different plane with the first force arm.
8. The clamping mechanism for a piezoelectric actuation assembly of claim 7, wherein the first moment arm and the second moment arm are perpendicular to each other.
9. An optical drive apparatus, comprising: A carrier for carrying the lens of the lens assembly; a piezoelectric drive assembly including a piezoelectric drive shaft for driving the carrier to move, and A clamping mechanism for a piezo-electric drive assembly as claimed in any one of claims 1 to 8.
10. A camera module, comprising: A lens; A carrier for carrying the lens of the lens assembly; a piezoelectric drive assembly including a piezoelectric drive shaft for driving the carrier to move, and A clamping mechanism for a piezo-electric drive assembly as claimed in any one of claims 1 to 8.

Description

Clamping mechanism for piezoelectric driving assembly, optical driving device and camera module Technical Field The present disclosure relates to a clamping mechanism for a piezoelectric driving assembly, an optical driving device and a camera module. Background In the field of piezoelectric driving, a piezoelectric driving shaft is typically clamped and driven by a spring structure to realize displacement of an optical component (such as a lens). Such spring plates need to ensure both stability of the drive shaft grip and accuracy of the drive. The clamping mechanism in the prior art often adopts a single spring plate structure. When the equipment carrying the clamping mechanism is subjected to external impact such as falling and impact, the impact force can be directly transmitted to the connecting part of the elastic sheet and the driving shaft, and the elastic sheet is easy to generate plastic deformation or damage. This not only affects the accuracy of the subsequent drive, but also may cause product failure. Disclosure of Invention The disclosure provides a clamping mechanism for a piezoelectric driving assembly, an optical driving device and a camera module. According to one aspect of the disclosure, a clamping mechanism for a piezoelectric driving assembly is provided, and the clamping mechanism comprises a piezoelectric spring piece, wherein the piezoelectric spring piece comprises at least two elastic arms, a clamping gap is formed between the two elastic arms at intervals and is used for clamping a piezoelectric driving shaft and in friction fit with the piezoelectric driving shaft to transmit driving force, one end of the reliable spring piece is fixedly connected with the piezoelectric spring piece, the other end of the reliable spring piece is directly or indirectly connected with a carrier, the carrier is used for bearing a lens of the lens assembly, and the elastic coefficient of the reliable spring piece is larger than that of the piezoelectric spring piece. According to the technical scheme of one aspect of the disclosure, the clamping mechanism is fixedly connected with the piezoelectric spring piece through the reliable spring piece with a larger elastic coefficient. When the carrier is impacted externally, the elastic coefficient of the reliable elastic sheet is larger than that of the piezoelectric elastic sheet, so that the impact load can preferentially enable the reliable elastic sheet to elastically deform, thereby effectively isolating and absorbing most impact energy, avoiding plastic deformation or damage of the piezoelectric elastic sheet due to overload, preventing the function failure of the clamping mechanism, and more importantly ensuring the stability of the clamping force between the piezoelectric elastic sheet and the piezoelectric driving shaft after the impact occurs and the accuracy of the relative position, and further ensuring the long-term reliability of the driving precision. According to the clamping mechanism for the piezoelectric driving assembly, the piezoelectric elastic sheet comprises four elastic arms, wherein the extending direction of at least one elastic arm and the extending direction of the other elastic arms are staggered in space, so that the four elastic arms jointly enclose to form a clamping gap. In the technical scheme of the embodiment, the four elastic arms can contact the piezoelectric driving shaft from multiple directions in a space staggered arrangement mode, so that the clamping contact area is increased, the clamping force is distributed more uniformly, and the stability and reliability of transmission are improved. According to the clamping mechanism for the piezoelectric driving assembly, which is at least one embodiment of the present disclosure, the piezoelectric shrapnel further comprises a bonding pad, four elastic arms are formed by extending the bonding pad, and one end of the reliability shrapnel is welded with the bonding pad. In the technical scheme of the embodiment, the bonding pad is used as a core connecting piece, so that an installation basis is provided for four elastic arms, meanwhile, the bonding pad also becomes a welding interface between the reliable elastic sheet and the piezoelectric elastic sheet, a mechanical reference point of the whole clamping mechanism is established, and a basis is provided for realizing stable clamping. In accordance with at least one embodiment of the present disclosure, a clamping mechanism for a piezoelectric drive assembly has at least one resilient arm with a locating V-shaped groove formed thereon for locating and receiving a piezoelectric drive shaft. In the technical scheme of the embodiment, the positioning V-shaped groove structure can form line contact or surface contact with the cylindrical piezoelectric driving shaft, and the contact mode has self-centering characteristic, so that the position of the piezoelectric driving shaft in the groove can be automatically adjusted, the