Search

CN-122002111-A - Actuator for camera

CN122002111ACN 122002111 ACN122002111 ACN 122002111ACN-122002111-A

Abstract

The present disclosure relates to an actuator for a camera. An actuator for a camera includes a housing having an inner space, a first bearing portion accommodated in the housing, and a first driving unit including a first magnet provided in the first bearing portion, a first coil provided to face the first magnet in a first axial direction, and a first position sensor configured to sense a position of the first bearing portion, wherein the first coil includes a first sub-coil and a second sub-coil spaced apart from each other in a second axial direction perpendicular to the first axial direction, a length of the first sub-coil in the second axial direction is longer than a length of the second sub-coil in the second axial direction, and the first position sensor is provided at a position spaced apart from a center of the first sub-coil in the second axial direction.

Inventors

  • LI DEXUAN
  • LI JINGXUN
  • Han Zaijiong

Assignees

  • 三星电机株式会社

Dates

Publication Date
20260508
Application Date
20251103
Priority Date
20241104

Claims (14)

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

Description

Actuator for camera Cross Reference to Related Applications The present application claims the priority rights of korean patent application No. 10-2025-0079802 filed in the korean intellectual property office on month 17 of 2025 and korean patent application No. 10-2024-0154669 filed in the korean intellectual property office on month 4 of 2024, the entire disclosures of which are incorporated herein by reference for all purposes. Technical Field The present disclosure relates to an actuator for a camera. Background Recently, camera modules have been employed in mobile devices such as smart phones, tablet PCs, and laptop computers. In addition, the camera module may include an actuator having a focusing function and an image stabilizing function to generate a high resolution image. For example, focusing may be performed by moving the lens module in the optical axis (Z axis) direction, or image stabilization may be performed by moving the lens module in a direction perpendicular to the optical axis (Z axis). However, as the performance of the camera module improves, the weight of the lens module increases. Further, since the weight of the driver for moving the lens module is also included, it may be difficult to precisely control the driving force for focusing and image stabilization. The above information is presented as background information only to aid in the understanding of the present disclosure. No determination is made as to whether any of the above can be applied as prior art with respect to the present disclosure, and no assertion is made. Disclosure of Invention 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 a camera includes a housing having an inner space, a first bearing portion accommodated in the housing, and a first driving unit including a first magnet disposed in the first bearing portion, a first coil disposed to face the first magnet in a first axial direction, and a first position sensor configured to sense a position of the first bearing portion, wherein the first coil includes a first sub-coil and a second sub-coil spaced apart from each other in a second axial direction perpendicular to the first axial direction, wherein a length of the first sub-coil in the second axial direction is longer than a length of the second sub-coil in the second axial direction, and wherein the first position sensor is disposed at a position spaced apart from a center of the first sub-coil in the second axial direction. The position of the first position sensor in the second axis direction may be between the center of the first sub-coil and the center of the second sub-coil. The 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. The length of the first polarity in the second axis direction may be longer than the length of the second polarity in the second axis direction, 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. The position of the first position sensor in the second axis direction may be between the center of the first polarity and the center of the second polarity. The center of the side surface of the first bearing portion on which the first magnet is disposed may overlap with the first position sensor in the second axial direction when viewed in the first axial direction. The actuator may further include a first ball member disposed between the housing and the first bearing portion, 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 of the first bearing portion, the surface of the housing and the surface of the first bearing portion facing each other in a direction perpendicular to both the first axis direction and the second axis direction. The first driving unit may further include a second magnet disposed on the first bearing portion, a second coil disposed to face the second magnet, and a second position sensor configured to sense a position of the first bearing portion, and the second coil may include a third sub-coil and a fourth sub-coil spaced apart from each other in the first axial 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 a drivin