US-20260126610-A1 - ACTUATOR FOR CAMERA

US20260126610A1US 20260126610 A1US20260126610 A1US 20260126610A1US-20260126610-A1

Abstract

An actuator for camera includes a housing having an internal space, a first carrier accommodated in the housing, and a first driving unit including a first magnet disposed in the first carrier, a first coil disposed to face the first magnet in a first-axis direction, and a first position sensor configured to sense a position of the first carrier, wherein the first coil includes a first sub-coil and a second sub-coil spaced apart from each other in a second-axis direction perpendicular to the first-axis direction, a length in the second-axis direction of the first sub-coil is longer than a length in the second-axis direction of the second sub-coil, and the first position sensor is disposed in a position spaced apart from a center of the first sub-coil in the second-axis direction.

Inventors

Deok Hyun Lee
Kyung Hun Lee
Jae Hyung HAN

Assignees

SAMSUNG ELECTRO-MECHANICS CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20250925
Priority Date: 20241104

Claims (14)

1 . An actuator for camera, comprising: a housing comprising an internal space; a first carrier accommodated in the housing; and a first driving unit comprising a first magnet disposed in the first carrier, a first coil disposed to face the first magnet in a first-axis direction, and a first position sensor configured to sense a position of the first carrier, wherein the first coil comprises a first sub-coil and a second sub-coil spaced apart from each other in a second-axis direction perpendicular to the first-axis direction, wherein a length in the second-axis direction of the first sub-coil is longer than a length in the second-axis direction of the second sub-coil, and wherein the first position sensor is disposed in a position spaced apart from a center of the first sub-coil in the second-axis direction.
2 . The actuator of claim 1 , wherein a position in the second-axis direction of the first position sensor is between a center of the first sub-coil and a center of the second sub-coil.
3 . The actuator of claim 1 , wherein a surface of the first magnet facing the first coil has a first polarity and a second polarity spaced apart from each other in the second-axis direction, wherein the first polarity and the second polarity are opposite polarities, and wherein the first polarity faces the first sub-coil, and the second polarity faces the second sub-coil.
4 . The actuator of claim 3 , wherein a length in the second-axis direction of the first polarity is longer than a length in the second-axis direction of the second polarity, and wherein the first position sensor faces a portion of the first magnet spaced apart from a center of the first polarity in the second-axis direction.
5 . The actuator of claim 3 , wherein a position in the second-axis direction of the first position sensor is between a center of the first polarity and a center of the second polarity.
6 . The actuator of claim 1 , wherein, when viewed in the first-axis direction, a center in the second-axis direction of a side surface of the first carrier, on which the first magnet is disposed, overlaps the first position sensor.
7 . The actuator of claim 1 , further comprising: a first ball member disposed between the housing and the first carrier, wherein a guide groove in which the first ball member is disposed is disposed on at least one of a surface of the housing and a surface the first carrier, facing each other in a direction perpendicular to both the first-axis direction and the second-axis direction.
8 . The actuator of claim 1 , wherein the first driving unit comprises a second magnet disposed on the first carrier, a second coil disposed to face the second magnet, and a second position sensor configured to sense a position of the first carrier, and wherein the second coil includes a third sub-coil and a fourth sub-coil spaced apart from each other in the first-axis direction.
9 . The actuator of claim 8 , wherein the second position sensor comprises a plurality of hall sensors spaced apart from each other in the first-axis direction.
10 . The actuator of claim 8 , wherein the first magnet and the first coil are configured to generate driving force in a direction in which the first magnet and the first coil face each other, and wherein the second magnet and the second coil are configured to generate driving force in a direction in which the second magnet and the second coil face each other.
11 . The actuator of claim 8 , further comprising: a second carrier accommodated in the first carrier; and an image sensor fixed to the second carrier and comprising an imaging plane, wherein the first carrier and the second carrier are configured to move together in the first-axis direction and the second-axis direction, and wherein the second carrier is configured to move relative to the first carrier in an optical-axis direction perpendicular to both the first-axis direction and the second-axis direction.
12 . The actuator of claim 11 , wherein a first yoke is disposed in the housing to face the first magnet and the second magnet in a direction perpendicular to the imaging plane.
13 . The actuator of claim 11 , further comprising: a second driving unit comprising a third magnet disposed in the first carrier and a third coil disposed in the second carrier, wherein a substrate is disposed in the second carrier, and the third coil is disposed on a surface of the substrate.
14 . The actuator of claim 13 , wherein the second magnet and the third magnet are disposed between the second coil and the third coil.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2025-0079802 filed on June 17, 2025, in the Korean Intellectual Property Office and Korean Patent Application No. 10-2024-0154669 filed on November 4, 2024, in the Korean Intellectual Property Office, the entire disclosures of which are incorporated herein by reference for all purposes. BACKGROUND 1. Field The present disclosure relates to an actuator for camera. 2. Description of the Background Recently, a camera module has been adopted in mobile devices such as a smartphone, a tablet PC, and a laptop. Also, a camera module may include an actuator having a focusing function and an image stabilization function to generate high-resolution images. For example, focusing may be performed by moving a lens module in an optical axis (Z-axis) direction, or image stabilization may be performed by moving a lens module in a direction perpendicular to the optical axis (Z-axis). However, as camera module performance has improved, a weight of a lens module has also increased. Also, as a weight of a driver used to move lens module is also included, it may be difficult to precisely control driving force for focusing and image stabilization. The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure. SUMMARY This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. In one general aspect, an actuator for camera includes a housing having an internal space, a first carrier accommodated in the housing, and a first driving unit including a first magnet disposed in the first carrier, a first coil disposed to face the first magnet in a first-axis direction, and a first position sensor configured to sense a position of the first carrier, wherein the first coil includes a first sub-coil and a second sub-coil spaced apart from each other in a second-axis direction perpendicular to the first-axis direction, wherein a length in the second-axis direction of the first sub-coil is longer than a length in the second-axis direction of the second sub-coil, and wherein the first position sensor is disposed in a position spaced apart from a center of the first sub-coil in the second-axis direction. A position in the second-axis direction of the first position sensor may be between a center of the first sub-coil and a center of the second sub-coil. A surface of the first magnet facing the first coil may have a first polarity and a second polarity spaced apart from each other in the second-axis direction, the first polarity and the second polarity may be opposite polarities, and the first polarity may face the first sub-coil, and the second polarity may face the second sub-coil. A length in the second-axis direction of the first polarity may be longer than a length in the second-axis direction of the second polarity, and the first position sensor may face a portion of the first magnet spaced apart from a center of the first polarity in the second-axis direction. A position in the second-axis direction of the first position sensor may be between a center of the first polarity and a center of the second polarity. When viewed in the first-axis direction, a center in the second-axis direction of a side surface of the first carrier, on which the first magnet is disposed, may overlap the first position sensor. The actuator may further include a first ball member disposed between the housing and the first carrier, wherein a guide groove in which the first ball member is disposed may be disposed on at least one of a surface of the housing and a surface the first carrier, facing each other in a direction perpendicular to both the first-axis direction and the second-axis direction. The first driving unit may include a second magnet disposed on the first carrier, a second coil disposed to face the second magnet, and a second position sensor configured to sense a position of the first carrier, and the second coil may include a third sub-coil and a fourth sub-coil spaced apart from each other in the first-axis direction. The second position sensor may include a plurality of hall sensors spaced apart from each other in the first-axis direction. The first magnet and the first coil may be configured to generate driving force in a direction in which the first magnet and the first coil face each other, and the second magnet and the second coil may be configured to generate driving force in a direction in which the second magnet and the