US-12625412-B2 - Camera actuator and camera module including the same

US12625412B2US 12625412 B2US12625412 B2US 12625412B2US-12625412-B2

Abstract

An embodiment of the present invention discloses a camera actuator including a housing, a mover disposed in the housing, a tilting guide part disposed between the housing and the mover, a driving part disposed in the housing to drive the mover, a first magnetic body disposed at the mover, and a second magnetic body disposed to face the first magnetic body, wherein the tilting guide part is pressed by the mover due to repulsive force of the first magnetic body and the second magnetic body.

Inventors

Sung Guk Lee

Assignees

LG INNOTEK CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20201123
Priority Date: 20191129

Claims (15)

1 . A camera actuator comprising: a housing; a mover disposed in the housing; a tilting guide part disposed between the housing and the mover; a driving part disposed in the housing to drive the mover; a first magnetic body disposed at the mover; a first member coupled to the mover; a second member disposed between the first member and the tilting guide part; and a second magnetic body disposed to face the first magnetic body, wherein the tilting guide part is pressed by the mover due to repulsive force of the first magnetic body and the second magnetic body.
2 . The camera actuator of claim 1 , wherein: the mover includes a groove configured to accommodate the tilting guide part; and wherein the first member and the second member are configured to be accommodated in the groove.
3 . The camera actuator of claim 2 , wherein: the tilting guide part is disposed between the first member and the second member.
4 . The camera actuator of claim 3 , wherein: the groove includes a first groove located on a bottom surface; the second member includes a second groove disposed on a surface facing the first groove; the first magnetic body is disposed in the first groove; and the second magnetic body is disposed in the second groove.
5 . The camera actuator of claim 4 , wherein the tilting guide part includes a base, a first protruding part that protrudes from a first surface of the base, and a second protruding part that protrudes from a second surface of the base.
6 . The camera actuator of claim 5 , wherein the mover is tilted about a first axis with respect to the first protruding part and is tilted about a second axis with respect to the second protruding part.
7 . The camera actuator of claim 6 , wherein: the first member includes a first protrusion groove configured to accommodate the first protruding part; and the second member includes a second protrusion groove configured to accommodate the second protruding part.
8 . The camera actuator of claim 7 , wherein: the first member, the second member, and the tilting guide part at least partially overlap the mover along the second axis; the tilting guide part overlaps the first member and the second member along a third axis; and the third axis is perpendicular to the first axis and the second axis.
9 . The camera actuator of claim 6 , wherein: the groove includes a first area in which the first member is accommodated and a second area in which the second member is accommodated; and a height of the first area is larger than a height of the second area.
10 . The camera actuator of claim 9 , wherein: the groove includes a third area in which the tilting guide part is accommodated; and the third area is disposed between the first area and the second area.
11 . The camera actuator of claim 10 , wherein a height of the third area is smaller than the height of the first area and larger than the height of the second area.
12 . The camera actuator of claim 6 , wherein: the driving part includes a driving magnet and a driving coil; the driving magnet includes a first magnet, a second magnet, and a third magnet; the driving coil includes a first coil, a second coil, and a third coil; the first magnet and the second magnet are symmetrically disposed about the first axis on the mover; the first coil and the second coil are symmetrically disposed about the first axis between the housing and the mover; the third magnet is disposed on a bottom surface of the mover; and the third coil is disposed on a bottom surface of the housing.
13 . The camera actuator of claim 12 , wherein the tilting guide part overlaps the third coil or the third magnet along a third axis.
14 . The camera actuator of claim 2 , wherein the second member is disposed between the tilting guide part and the first member.
15 . A camera actuator comprising: a housing; a mover disposed in the housing; a tilting guide part disposed between the housing and the mover; a driving part disposed in the housing to drive the mover; a first magnetic body disposed at the mover; a first member coupled to the mover; a second member disposed between the first member and the tilting guide part; and a support member disposed in the housing and in which a second magnetic body is disposed, wherein the tilting guide part is disposed between the mover and the support member, and surfaces of the first magnetic body and the second magnetic body that face each other have the same polarity.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is the National Phase of PCT/KR2020/016560 filed on Nov. 23, 2020, which claims priority under 35 U.S.C. § 119 (a) to Patent Application No. 10-2019-0157001 filed in the Republic of Korea, all of which are hereby expressly incorporated by reference into the present application. BACKGROUND 1. Field of the Invention The present invention relates to a camera actuator and a camera module including the same. 2. Discussion of Related Art Cameras are devices that capture pictures or videos of subjects and are mounted in portable devices, drones, vehicles, and the like. A camera module may have an image stabilization (IS) function that corrects or prevents a blurry image caused by user movement to improve the quality of the image, an auto-focusing (AF) function that automatically adjusts a gap between an image sensor and a lens to align a focal length of the lens, and a zooming function that increases or reduces magnification of a distant subject through a zoom lens to capture the subject. Meanwhile, the larger the number of pixels in an image sensor, the higher the resolution and the smaller the size of each pixel, but the smaller the pixel, the less the amount of light received during the same period of time. Therefore, the larger the number of pixels in a camera, the greater the potential for the blurry image phenomenon to occur severely due to hand shaking when the shutter speed is slow in a dark environment. The optical image stabilizer (OIS) technology, which is a technology in which an optical path is changed to correct blur due to movement, is a typical IS technology. According to the general OIS technology, movement of a camera may be detected through a gyro sensor or the like, and on the basis of the detected movement, a lens may be tilted or moved or a camera module including a lens and an image sensor may be tilted or moved. In a case in which the lens or the camera module including the lens and the image sensor is tilted or moved for OIS, a space for tilting or movement is required to be additionally secured around the lens or the camera module. Meanwhile, an OIS actuator may be disposed around the lens. Here, the OIS actuator may include actuators responsible for tilting about two axes perpendicular to the optical axis Z, i.e., an actuator responsible for X-axis tilting and an actuator responsible for Y-axis tilting. However, due to the need for an ultra-slim, ultra-small camera module, there is a great limitation in space for arranging the OIS actuators, and it may be difficult to guarantee sufficient space in which the lens or the camera module including the lens and the image sensor may be tilted or moved for OIS. Also, it is preferable that the larger the number of pixels in a camera, the larger the size of a lens to increase the amount of light received, but there may be a limitation in increasing the size of the lens due to the space occupied by the OIS actuators. Also, in a case in which all of the zooming function, AF function, and OIS function are included in the camera module, there is a problem in that an OIS magnet, an AF magnet, and a zooming magnet are disposed close to each other and cause magnetic field interference to occur. SUMMARY OF THE INVENTION The present invention is directed to providing a camera actuator that may be applied to an ultra-slim, ultra-small, and high-resolution camera. A camera actuator according to an embodiment of the present invention includes a housing, a mover disposed in the housing, a tilting guide part disposed between the housing and the mover, a driving part disposed in the housing to drive the mover, a first magnetic body disposed at the mover, and a second magnetic body disposed to face the first magnetic body, wherein the tilting guide part is pressed by the mover due to repulsive force of the first magnetic body and the second magnetic body. The mover may include a seating groove configured to accommodate the tilting guide part, and the camera actuator may further include a first member and a second member that are configured to be accommodated in the seating groove. The tilting guide part may be disposed between the first member and the second member, and the second member may be disposed between the tilting guide part and the mover. The seating groove may include a first groove located on a bottom surface, the second member may include a second groove disposed on a surface facing the first groove, the first magnetic body may be disposed in the first groove, and the second magnetic body may be disposed in the second groove. The tilting guide part may include a base, a first protruding part that protrudes from a first surface of the base, and a second protruding part that protrudes from a second surface of the base. The mover may be tilted about a first axis with respect to the first protruding part and may be tilted about a second axis with respect to the second protruding part. The first mem