Reflective member driving device

Patent metadata

Field	Value
Publication number	US-12510801-B2
Application number	US-202218284329-A
Country	US
Kind code	B2
Filing date	Mar 25, 2022
Priority date	Apr 1, 2021
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

A reflective member driving device including a housing; a holder which is disposed within the housing; a reflective member which is disposed in the holder; a moving plate which is disposed between the housing and the holder; a driving magnet and a sensing magnet which are disposed in the holder; a coil which electromagnetically interacts with the driving magnet; and a first sensor which senses the sensing magnet. The driving magnet includes a first magnet which tilts the reflective member about a first axis and a second magnet which tilts the reflective member about a second axis perpendicular to the first axis. The sensing magnet is disposed at a location where the sensing magnet does not electromagnetically interact with the coil.

First claim

The invention claimed is:

1 . A reflective member driving device, comprising:
a housing; a holder disposed in the housing; a reflective member disposed on the holder; a moving plate disposed between the housing and the holder; a driving magnet and a sensing magnet disposed on the holder; a coil configured to electromagnetically interact with the driving magnet; and a first sensor configured to sense the sensing magnet, wherein the driving magnet comprises a first magnet configured to tilt the reflective member about a first axis and a second magnet configured to tilt the reflective member about a second axis perpendicular to the first axis, wherein the sensing magnet is disposed at a position where the sensing magnet does not electromagnetically interact with the coil, wherein the second magnet is disposed on two lateral surfaces of the holder, wherein the sensing magnet is disposed on the two lateral surfaces of the holder, and wherein the sensing magnet more protrudes from the two lateral surfaces of the holder than the second magnet.

2 . The reflective member driving device of claim 1 , wherein the first magnet is disposed on a lower surface of the holder.

3 . The reflective member driving device of claim 2 , wherein the first sensor is configured to detect a tilt about the first axis of the reflective member.

4 . The reflective member driving device of claim 3 , comprising a second sensor configured to sense the second magnet, wherein the second sensor is configured to sense a tilt about the second axis of the reflective member.

5 . The reflective member driving device of claim 4 , wherein a distance between the sensing magnet and the first sensor is shorter than a distance between the second magnet and the second sensor.

6 . The reflective member driving device of claim 4 , wherein the sensing magnet comprises a first surface facing the first sensor, wherein the second magnet comprises a first surface facing the second sensor, and wherein an area of the first surface of the second magnet is greater than an area of the first surface of the sensing magnet.

7 . The reflective member driving device of claim 4 , wherein the second magnet comprises a first sub-magnet disposed on a first lateral surface of the holder and a second sub-magnet disposed on a second lateral surface opposite the first lateral surface of the holder, and wherein the sensing magnet comprises a first sensing magnet disposed on the first lateral surface of the holder and a second sensing magnet disposed on the second lateral surface of the holder.

8 . The reflective member driving device of claim 7 , wherein the first sensor comprises a first sub-sensor configured to sense the first sensing magnet, and a second sub-sensor configured to sense the second sensing magnet, wherein the second sensor comprises a third sub-sensor configured to sense the first sub-magnet, and a fourth sub-sensor configured to sense the second sub-magnet, and wherein a distance between the first sub-sensor and the second sub-sensor is same as a distance between the third sub-sensor and the fourth sub-sensor.

9 . The reflective member driving device of claim 4 , wherein, in a direction of a third axis perpendicular to the first axis and the second axis, a distance between a center of the sensing magnet and the moving plate is greater than a distance between a center of the first magnet and the moving plate.

10 . The reflective member driving device of claim 2 , wherein the sensing magnet is further spaced apart from the moving plate than the second magnet.

11 . The reflective member driving device of claim 2 , wherein the coil comprises a first coil facing the first magnet, and a second coil facing the second magnet, and wherein, in a direction of a third axis perpendicular to the first axis and the second axis, at least a portion of the sensing magnet is overlapped with the second coil.

12 . The reflective member driving device of claim 1 , comprising a substrate disposed in the housing, wherein the first sensor is disposed on the substrate, wherein the housing comprises a hole disposed with the first sensor, and wherein, in a direction of the second axis, a length of the hole of the housing is shorter than a length of the sensing magnet.

13 . The reflective member driving device of claim 1 , wherein, in a direction of the second axis, at least a portion of the sensing magnet is overlapped with the housing.

14 . A camera device, comprising:
a printed circuit board; an image sensor disposed on the printed circuit board; the reflective member driving device of claim 1 ; and a lens disposed on an optical path formed by the reflective member of the reflective member driving device and the image sensor.

15 . An optical apparatus, comprising:
a body; the camera device of claim 14 disposed on the body; and a display disposed on the body and configured to output at least one of a video or an image taken by the camera device.

16 . A reflective member driving device, comprising:
a housing; a holder disposed in the housing; a reflective member disposed on the holder; a moving plate disposed between the housing and the holder; a first magnet and a second magnet disposed on the holder; a first coil configured to tilt the reflective member about a first axis through electromagnetic interaction with the first magnet; a second coil configured to tilt the reflective member about a second axis perpendicular to the first axis through electromagnetic interaction with the second magnet; a sensing magnet disposed on the holder; a first sensor configured to sense the sensing magnet; and a second sensor configured to sense the second magnet, wherein a distance between the sensing magnet and the first sensor is shorter than a distance between the second magnet and the second sensor, and wherein, in a direction of the second axis, at least a portion of the sensing magnet is overlapped with the housing.

17 . The reflective member driving device of claim 16 , wherein the first magnet is disposed on a lower surface of the holder, wherein the second magnet is disposed on two lateral surfaces of the holder, and wherein the sensing magnets is disposed on the two lateral surfaces of the holder.

18 . The reflective member driving device of claim 16 , wherein the sensing magnet is further spaced apart from the moving plate than the second magnet.

19 . The reflective member driving device of claim 16 , wherein, in a direction of a third axis perpendicular to the first axis and the second axis, a distance between a center of the sensing magnet and the moving plate is greater than a distance between a center of the first magnet and the moving plate.

20 . A reflective member driving device, comprising:
a housing; a holder disposed in the housing; a reflective member disposed on the holder; a moving plate disposed between the housing and the holder; a first magnet disposed on a lower surface of the holder; a second magnet disposed on two lateral surfaces of the holder; a first coil disposed at a position corresponding with the first magnet; a second coil disposed at a position corresponding to the second magnet; a sensing magnet disposed on the two lateral surfaces of the holder; and a first sensor configured to detect the sensing magnet, wherein the sensing magnet more protrudes from the two lateral surfaces of the holder than the second magnet.

Assignees

• Lg Innotek Co Ltd

Inventors

• Lee Sung Guk

Classifications

• G03B2205/0069

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

• G03B2205/0023

  by tilting or inclining one or more optical elements with respect to the optical axis · CPC title

• G03B17/17

  with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera · CPC title

• G03B17/12 Primary

  with means for supporting objectives, supplementary lenses, filters, masks, or turrets · CPC title

• G03B30/00

  Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles · CPC title