KR-20260066609-A - Actuator for camera

KR20260066609AKR 20260066609 AKR20260066609 AKR 20260066609AKR-20260066609-A

Abstract

An actuator for a camera according to one embodiment of the present invention comprises: a housing having 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 facing the first magnet in a first axial direction, and a first position sensor for detecting the position of the first carrier; wherein the first coil includes a first sub-coil and a second sub-coil spaced apart in a second axial direction perpendicular to the first axial direction, the length of the first sub-coil in the second axial direction is longer than the length of the second sub-coil in the second axial direction, and the first position sensor may be disposed at a position spaced apart from the center of the first sub-coil in the second axial direction.

Inventors

이덕현
이경훈
한재형

Assignees

삼성전기주식회사

Dates

Publication Date: 20260512
Application Date: 20250617
Priority Date: 20241104

Claims (14)

Housing having an internal space; A first carrier accommodated in the above housing; and A first driving unit comprising: a first magnet disposed on the first carrier, a first coil disposed facing the first magnet in a first axial direction, and a first position sensor for detecting the position of the first carrier; and The first coil includes a first sub-coil and a second sub-coil spaced apart in a second axial direction perpendicular to the first axial direction, and The length of the first sub-coil in the second axial direction is longer than the length of the second sub-coil in the second axial direction, and The first position sensor is a camera actuator positioned at a location spaced apart from the center of the first sub-coil in the second axis direction.
In paragraph 1, 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, for a camera actuator.
In paragraph 1, One surface of the first magnet facing the first coil has a first polarity and a second polarity spaced apart along the second axis direction, The first polarity and the second polarity are opposite polarities to each other, An actuator for a camera in which the first polarity faces the first sub-coil and the second polarity faces the second sub-coil.
In paragraph 3, 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 The first position sensor is a camera actuator facing a part of the first magnet spaced apart from the center of the first polarity in the second axial direction.
In paragraph 3, The position of the first position sensor in the second axis direction is between the center of the first polarity and the center of the second polarity, for a camera actuator.
In paragraph 1, When viewed from the first axis direction, the center in the second axis direction of one side of the first carrier on which the first magnet is placed overlaps with the first position sensor, forming a camera actuator.
In paragraph 1, It further includes a first ball member disposed between the housing and the first carrier, and An actuator for a camera, wherein a guide groove in which the first ball member is disposed is disposed on at least one of the surface of the housing and the surface of the first carrier, facing each other in a direction perpendicular to both the first axis direction and the second axis direction.
In paragraph 1, The first driving unit comprises a second magnet disposed on the first carrier, a second coil disposed facing the second magnet, and a second position sensor for detecting the position of the first carrier. The above second coil is an actuator for a camera comprising a third sub-coil and a fourth sub-coil spaced apart in the first axial direction.
In paragraph 8, The second position sensor is an actuator for a camera comprising a plurality of Hall sensors spaced apart in the first axis direction.
In paragraph 8, The first magnet and the first coil generate a driving force in a direction facing each other, and The above second magnet and the above second coil are actuators for a camera that generate driving force in directions facing each other.
In paragraph 8, A second carrier accommodated in the first carrier; and It further includes an image sensor having an imaging surface and fixedly disposed with respect to the second carrier; The first carrier and the second carrier are configured to move together in the first axis direction and the second axis direction, and The second carrier is an actuator for a camera capable of relative movement with respect to the first carrier in an optical axis direction perpendicular to both the first axis direction and the second axis direction.
In Paragraph 11, An actuator for a camera, wherein a first yoke is positioned in the housing so as to face the first magnet and the second magnet in a direction perpendicular to the imaging surface.
In Paragraph 11, A second driving unit comprising a third magnet disposed in the first carrier and a third coil disposed in the second carrier; further comprising An actuator for a camera in which a substrate is disposed on the second carrier and the third coil is disposed on one surface of the substrate.
In Paragraph 13, An actuator for a camera in which the second magnet and the third magnet are disposed between the second coil and the third coil.

Description

Actuator for camera The present invention relates to an actuator for a camera. Recently, camera modules are being adopted in mobile communication devices, including smartphones, tablet PCs, and laptops. In addition, the camera module is equipped with an actuator having a focus adjustment function and an image stabilization function to generate high-resolution images. For example, the lens module is moved along the optical axis (Z-axis) to adjust the focus, or the lens module is moved perpendicular to the optical axis (Z-axis) to correct shake. However, as the performance of camera modules has recently improved, the weight of lens modules has also increased. Furthermore, due to the influence of the weight of the drive unit used to move the lens module, there is a problem in that it is difficult to precisely control the driving force for focus adjustment and shake correction. FIG. 1 is a perspective view of a camera module according to one embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a camera module according to one embodiment of the present invention. FIG. 3 is a schematic exploded perspective view of a camera module according to one embodiment of the present invention. FIG. 4 is an exploded perspective view of a housing, a first carrier, and a first driving part according to one embodiment of the present invention. FIG. 5 is a bottom view of a housing according to one embodiment of the present invention. FIG. 6 is a plan view showing the combined state of the configurations illustrated in FIG. 4. Figure 7 is a cross-sectional view of II' of Figure 6. FIG. 8 is a perspective view of a first driving unit according to one embodiment of the present invention. FIG. 9 is a schematic plan view of a camera module with the case removed according to one embodiment of the present invention. FIGS. 10a, FIGS. 10b, and FIGS. 10c are drawings for explaining the effect of rotation of the second carrier on position sensing of the second carrier. FIGS. 11 to 13 are drawings illustrating variations of the first magnet and the first coil of the first driving unit. FIG. 14 is a plan view of a sensor substrate (400) of an actuator (10) according to one embodiment of the present invention. Fig. 15 is a cross-sectional view taken along line II-II' of Fig. 14. FIG. 16 is an exploded perspective view of a first carrier, a second carrier, and a second driving unit according to an embodiment of the present invention. Fig. 17 is a perspective view of Fig. 16 seen from a different direction. Fig. 18 is a side view of the second carrier. FIGS. 19 to 21 are schematic exploded perspective views of a camera module according to another embodiment of the present invention. Embodiments of the present invention will be described in detail below with reference to the drawings. However, the scope of the present invention is not limited to the embodiments presented. For example, a person skilled in the art who understands the concept of the present invention may propose other embodiments included within the scope of the concept of the present invention through the addition, modification, or deletion of components, and such embodiments shall also be deemed to be included within the scope of the concept of the present invention. Additionally, terms including ordinal numbers, such as "first," "second," etc., used in this specification may be used to describe various components, but said components are not limited by said terms, and said terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. In addition, the configuration included in one embodiment of this specification may be applied to other embodiments unless specifically stated otherwise. A camera module according to embodiments of the present invention may be mounted on a portable electronic device. The portable electronic device may be a portable electronic device such as a mobile communication terminal, a smartphone, or a tablet PC. In this specification, the direction in which the imaging surface of the image sensor (S) faces may mean the direction of the optical axis (Z-axis). In the present specification, the fact that the image sensor (S) moves in a direction parallel to the imaging plane of the image sensor (S) can be understood as the image sensor (S) moving in a direction perpendicular to the optical axis (Z-axis). In addition, the first axis (X-axis) direction and the second axis (Y-axis) direction are examples of two directions that are perpendicular to the optical axis (Z-axis) and intersect each other, and in this specification, the first axis (X-axis) direction and the second axis (Y-axis) direction can be understood as two directions that are perpendicular to the optical axis (Z-axis) and intersect each other. FIG. 1 is a