Lens driving device

Patent metadata

Field	Value
Publication number	US-12474538-B2
Application number	US-202117536111-A
Country	US
Kind code	B2
Filing date	Nov 29, 2021
Priority date	Dec 1, 2020
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A lens driving device related to the field of driving devices and includes a lens assembly and a driving module for driving the lens assembly to move. The driving module includes a first driving module and a second driving module. The lens assembly is accommodated in the first driving module. The second driving module is sleeved on one side of the first driving module away from the lens assembly. The lens assembly is driven by the first driving module and the second driving module that realize movement in multiple different directions, so the lens assembly accommodated in the first driving module realizes movement in multiple directions, thereby achieving good image stabilization effect.

First claim

What is claimed is:

1 . A lens driving device, comprising:
a lens assembly; and a driving module for driving the lens assembly to move; wherein the driving module comprises a first driving module and a second driving module; the lens assembly is accommodated in the first driving module; the second driving module is sleeved on one side of the first driving module away from the lens assembly; wherein the first driving module comprises a first driving assembly; the first driving assembly drives the lens assembly to translate along an optical axis, a first axis perpendicular to the optical axis, and a second axis perpendicular to the optical axis; wherein the second driving module comprises a first outer frame, a second outer frame, a bracket assembly, and a second driving assembly; the first outer frame is sleeved on an outer side of the first driving module and is fixedly connected with the first driving module; the second outer frame is sleeved on an outer side of the first outer frame; the second outer frame and the first outer frame are spaced apart; wherein the first outer frame can rotate along a third axis relative to the bracket assembly and is connected to the bracket assembly; so the first outer frame rotates around the third axis with respect to the second outer frame; the bracket assembly can rotate along a fourth axis relative to the second outer frame and is connected to the second outer frame; the first outer frame is suspended in the second outer frame so the bracket assembly and the first outer frame can rotate together around the fourth axis with respect to the second outer frame; the third axis and the fourth axis are perpendicular to the optical axis; the second driving assembly drives the first driving module to rotate around the third axis and the fourth axis with respect to the second outer frame; wherein the first driving module further comprises a base, a support frame, a housing, and an elastic sheet assembly; the support frame comprises an accommodating space; the support frame is supported on the base; the housing is covered on the base, so the support frame is disposed in the housing; the elastic sheet assembly elastically supports the lens assembly in the accommodating space; wherein the first driving assembly comprises a first driving coil assembly disposed on the base, a first magnet assembly, a first Hall sensor, and second driving coils; the first magnet assembly comprises first magnets disposed on the support frame; the first driving coil assembly comprises first driving coils disposed on the base; the first driving coils cooperate with the first magnets for driving the support frame to translate along the first axis and the second axis; the first Hall sensor is fixed on the base for detecting a displacement of the lens assembly; wherein the second driving coils are disposed on the lens assembly; the second driving coils cooperate with the first magnet assembly for driving the lens assembly to translate along the optical axis.

2 . The lens driving device according to claim 1 , wherein the elastic sheet assembly comprises an upper elastic sheet, a lower elastic sheet, and anti-shake hanging wires; a first end of the upper elastic sheet is fixed to a top end of the support frame; a second end of the upper elastic sheet is fixed to a top end of the lens assembly; a first end of the lower elastic sheet is fixed to a bottom end of the support frame; a second end of the lower elastic sheet is fixed to a bottom end of the lens assembly; a first end of each of the anti-shake hanging wires is connected with the upper elastic sheet; a second end of each of the anti-shake hanging wire is fixed on the base; the support frame is supported on the base through the anti-shake hanging wires.

3 . The lens driving device according to claim 1 , wherein the first magnet assembly further comprises a second magnet fixed on one side of the support frame the second magnet is disposed on a side different from the first magnets; the first driving coil assembly comprises third driving coils for driving the second magnet and the support frame to rotate around the optical axis; wherein two third driving coils are provided; the two third driving coils are disposed on two ends of the second magnet; the two third driving coils drive the two ends of the second magnet to move in opposite directions to drive the support frame to rotate.

4 . The lens driving device according to claim 3 , wherein at least two second driving coils are provided; the at least two second driving coils are disposed oppositely on a peripheral wall of the lens assembly; a winding plane of each of the second driving coils is perpendicular to a winding plane of each of the first driving coils; the first magnet assembly comprises third magnets fixed on two sides of the support frame; positions of the third magnets correspond to positions of the second driving coils; the third magnets have a first magnetization direction parallel to the winding plane of each of the first driving coils and a second magnetization direction perpendicular to the winding plane of each of the first driving coils; the second driving coils drives the lens assembly to move with respect to the third magnets along a direction parallel to the optical axis; at least one of the third magnets is configured as one of the first magnets or the second magnet.

5 . The lens driving device according to claim 3 , wherein the first driving coil assembly is disposed on a first circuit board; the first circuit board comprises a printed circuit board (PCB) with a groove and a flexible printed circuit board (FPC) attached to a side of the PCB opposite to the base; the first driving coil assembly is embedded in the groove.

6 . The lens driving device according to claim 1 , wherein the second driving assembly comprises a second magnet assembly, a second driving coil assembly, a second circuit board, and a second Hall sensor; the second magnet assembly comprises at least two fourth magnets disposed on two adjacent first side walls of the first outer frame;
wherein the second driving coil assembly comprises at least two fourth driving coils disposed on two adjacent second side walls of the second outer frame; each of the fourth driving coils is disposed opposite to a corresponding fourth magnet; each of the fourth driving coils and the corresponding fourth magnet are spaced apart; wherein the second circuit board is disposed on an outer periphery of the second outer frame and is electrically connected with the fourth driving coils; wherein the second Hall sensor is disposed on the second circuit board for detecting a displacement of the first driving module.

7 . The lens driving device according to claim 6 , wherein a magnetic isolation plate is disposed on one side of each of the fourth magnets facing the lens assembly.

8 . The lens driving device according to claim 5 , wherein the first Hall sensor is disposed on the FPC; the first Hall sensor is disposed corresponding to two ends or a middle position of one or more of the first magnets and the second magnet of the first magnet assembly.

9 . The lens driving device according to claim 1 , wherein the bracket assembly comprises a bracket body disposed on an upper portion of the housing; first extension portions extending from two ends of the bracket body in a direction of the third axis, and second extension portions extending from another two ends of the bracket body in a direction of the fourth axis; the first extension portions are rotatably connected with the first outer frame; the second extension portions are rotatably connected with the second outer frame.

10 . The lens driving device according to claim 9 , wherein the first extensi

Assignees

• Changzhou Aac Raytech Optronics Co Ltd

Inventors

• Wang Yiwei
• Wei Suohe

Classifications

• H05K2201/09036

  Recesses or grooves in insulating substrate · CPC title

• H05K1/14

  Structural association of two or more printed circuits (providing electric connection to or between printed circuits H05K1/11, H01R12/00) · CPC title

• H05K1/0277

  Bendability or stretchability details (H05K1/038, H05K3/4691 take precedence) · CPC title

• H01F7/081

  Magnetic constructions · CPC title

• G03B2205/0069

  using electromagnetic actuators, e.g. voice coils · CPC title