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KR-102963084-B1 - ACTUATOR FOR CAMERA AND CAMERA MODULE INCLUDING THE SAME

KR102963084B1KR 102963084 B1KR102963084 B1KR 102963084B1KR-102963084-B1

Abstract

The disclosed actuator for a camera comprises a base, first, second, and third moving frames stacked on the base in the direction of the optical axis, an image sensor mounted on the first moving frame, a first sensor driving unit comprising a plurality of first frame driving members and a plurality of first shape memory alloy (SMA) wires that are interlocked to drive the first moving frame in a first direction perpendicular to the direction of the optical axis, a second sensor driving unit comprising a plurality of second frame driving members and a plurality of second shape memory alloy wires that are interlocked to drive the second moving frame in a second direction perpendicular to the direction of the optical axis and the first direction, and a third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are interlocked to drive the third moving frame in a second direction perpendicular to the direction of the optical axis and the first direction, and a third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are interlocked to drive the third moving frame in rotation with respect to the optical axis.

Inventors

  • 전재우

Assignees

  • 삼성전기주식회사

Dates

Publication Date
20260508
Application Date
20221226

Claims (20)

  1. delete
  2. base, First, second, and third movable frames stacked in the optical axis direction on the above base, An image sensor mounted on the first moving frame, A first sensor driving unit comprising a plurality of first frame driving members and a plurality of first shape memory alloy (SMA) wires that are positioned on the outer edge of the first moving frame and interlock with each other to drive the first moving frame in a first direction perpendicular to the optical axis direction, A second sensor driving unit comprising a plurality of second frame driving members and a plurality of second shape memory alloy wires that are positioned on the outer edge of the second moving frame and interlock with each other to drive the second moving frame in a second direction perpendicular to the optical axis direction and the first direction, and A third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are positioned on the outer edge of the third moving frame and interlock with each other to drive the third moving frame to rotate with respect to the optical axis, and The first moving frame includes a first stepped portion arranged to extend along both opposing sides of the first moving frame, and The second movable frame includes a second stepped portion having a shape complementary to the first stepped portion on both opposing sides of the second movable frame, and An actuator for a camera, wherein the first stepped portion and the second stepped portion are joined with a distance between them.
  3. base, First, second, and third movable frames stacked in the optical axis direction on the above base, An image sensor mounted on the first moving frame, A first sensor driving unit comprising a plurality of first frame driving members and a plurality of first shape memory alloy (SMA) wires that are positioned on the outer edge of the first moving frame and interlock with each other to drive the first moving frame in a first direction perpendicular to the optical axis direction, A second sensor driving unit comprising a plurality of second frame driving members and a plurality of second shape memory alloy wires that are positioned on the outer edge of the second moving frame and interlock with each other to drive the second moving frame in a second direction perpendicular to the optical axis direction and the first direction, and A third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are positioned on the outer edge of the third moving frame and interlock with each other to drive the third moving frame to rotate with respect to the optical axis, and One end of each of the plurality of first frame driving members is rotatably fixed to the outer side of one corner of the first movable frame, and the other end of each of the plurality of first frame driving members is positioned to be in contact with the edge of the first movable frame. Each of the plurality of first shape memory alloy wires is coupled to one end of each of the plurality of first frame driving members to provide rotational driving force. One end of each of the plurality of second frame driving members is rotatably fixed to the outer side of one corner of the second movable frame, and the other end of each of the plurality of second frame driving members is positioned to be in contact with the edge of the second movable frame. An actuator for a camera, wherein each of the plurality of second shape memory alloy wires is coupled to one end of each of the plurality of second frame driving members to provide rotational driving force.
  4. base, First, second, and third movable frames stacked in the optical axis direction on the above base, An image sensor mounted on the first moving frame, A first sensor driving unit comprising a plurality of first frame driving members and a plurality of first shape memory alloy (SMA) wires that are positioned on the outer edge of the first moving frame and interlock with each other to drive the first moving frame in a first direction perpendicular to the optical axis direction, A second sensor driving unit comprising a plurality of second frame driving members and a plurality of second shape memory alloy wires that are positioned on the outer edge of the second moving frame and interlock with each other to drive the second moving frame in a second direction perpendicular to the optical axis direction and the first direction, and A third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are positioned on the outer edge of the third moving frame and interlock with each other to drive the third moving frame to rotate with respect to the optical axis, and The second movable frame includes an extension portion that extends outwardly along both opposing sides of the second movable frame, and The third movable frame is arranged to extend along both opposing sides of the third movable frame and includes a third stepped portion having a shape that is raised upward and drawn outward from the inner edge of the third movable frame. An actuator for a camera, wherein the above extension is connected through the recessed space of the third step portion while being spaced apart from the third step portion at a distance therefrom.
  5. base, First, second, and third movable frames stacked in the optical axis direction on the above base, An image sensor mounted on the first moving frame, A first sensor driving unit comprising a plurality of first frame driving members and a plurality of first shape memory alloy (SMA) wires that are positioned on the outer edge of the first moving frame and interlock with each other to drive the first moving frame in a first direction perpendicular to the optical axis direction, A second sensor driving unit comprising a plurality of second frame driving members and a plurality of second shape memory alloy wires that are positioned on the outer edge of the second moving frame and interlock with each other to drive the second moving frame in a second direction perpendicular to the optical axis direction and the first direction, and A third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are positioned on the outer edge of the third moving frame and interlock with each other to drive the third moving frame to rotate with respect to the optical axis, and One end of each of the plurality of third frame driving members is rotatably fixed to the edge of the third movable frame, and the other end of each of the plurality of third frame driving members is positioned to be in contact with the outer side of one corner of the third movable frame. An actuator for a camera, wherein each of the plurality of third shape memory alloy wires is coupled to one end of each of the plurality of third frame driving members to provide rotational driving force.
  6. base, First, second, and third movable frames stacked in the optical axis direction on the above base, An image sensor mounted on the first moving frame, A first sensor driving unit comprising a plurality of first frame driving members and a plurality of first shape memory alloy (SMA) wires that are positioned on the outer edge of the first moving frame and interlock with each other to drive the first moving frame in a first direction perpendicular to the optical axis direction, A second sensor driving unit comprising a plurality of second frame driving members and a plurality of second shape memory alloy wires that are positioned on the outer edge of the second moving frame and interlock with each other to drive the second moving frame in a second direction perpendicular to the optical axis direction and the first direction, and A third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are positioned on the outer edge of the third moving frame and interlock with each other to drive the third moving frame to rotate with respect to the optical axis, and An actuator for a camera, wherein the base is located in an area where the four corners of the third movable frame are positioned, and includes a guide member that protrudes from the base and is bent toward the center.
  7. base, First, second, and third movable frames stacked in the optical axis direction on the above base, An image sensor mounted on the first moving frame, A first sensor driving unit comprising a plurality of first frame driving members and a plurality of first shape memory alloy (SMA) wires that are positioned on the outer edge of the first moving frame and interlock with each other to drive the first moving frame in a first direction perpendicular to the optical axis direction, A second sensor driving unit comprising a plurality of second frame driving members and a plurality of second shape memory alloy wires that are positioned on the outer edge of the second moving frame and interlock with each other to drive the second moving frame in a second direction perpendicular to the optical axis direction and the first direction, and A third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are positioned on the outer edge of the third moving frame and interlock with each other to drive the third moving frame to rotate with respect to the optical axis, and The plurality of first frame driving members includes a pair of first frame driving members, and Each of the above pair of first frame driving members is positioned on the diagonally opposite side of the second movable frame, and The plurality of second frame driving members above includes a pair of second frame driving members, and Each of the above pair of second frame driving members is an actuator for a camera, positioned on the diagonally opposite side of the third moving frame.
  8. base, First, second, and third movable frames stacked in the optical axis direction on the above base, An image sensor mounted on the first moving frame, A first sensor driving unit comprising a plurality of first frame driving members and a plurality of first shape memory alloy (SMA) wires that are positioned on the outer edge of the first moving frame and interlock with each other to drive the first moving frame in a first direction perpendicular to the optical axis direction, A second sensor driving unit comprising a plurality of second frame driving members and a plurality of second shape memory alloy wires that are positioned on the outer edge of the second moving frame and interlock with each other to drive the second moving frame in a second direction perpendicular to the optical axis direction and the first direction, and A third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are positioned on the outer edge of the third moving frame and interlock with each other to drive the third moving frame to rotate with respect to the optical axis, and The plurality of third frame driving members includes a pair of third frame driving members and another pair of third frame driving members, and Each of the above-mentioned pair of third frame driving members is positioned on the diagonally opposite side of the base, and An actuator for a camera, wherein each of the other pair of third frame driving members is arranged on the base symmetrically with respect to the pair of third frame driving members with respect to a straight line passing through the optical axis and parallel to the base.
  9. A first lens driving member comprising a first holder positioned to surround a lens module, and a plurality of first driving arms positioned on the side of the first holder and extending in all directions perpendicular to the optical axis, A second holder disposed to surround the lens module, and a plurality of second driving arms disposed on the side of the second holder and extending in all directions perpendicular to the optical axis, and a second lens driving member disposed on one surface of the first lens driving member along the optical axis. A plurality of first shape memory alloy wires (SMA), arranged to span across the plurality of first driving arms and configured to generate a driving force downward parallel to the optical axis, and A plurality of second shape memory alloy wires arranged to span across the plurality of second driving arms and configured to generate a driving force upwardly parallel to the optical axis. An actuator for a camera comprising
  10. In Article 9, An actuator for a camera further comprising an elastic member disposed between the first lens driving member and the second lens driving member.
  11. In Article 9, The first holder and the second holder are ring-shaped actuators for a camera.
  12. In Article 9, Each of the plurality of first driving arms is in the shape of a cylinder protruding from the first holder in a direction perpendicular to the optical axis, and A camera actuator in which each of the plurality of second driving arms is a cylindrical shape protruding from the second holder in a direction perpendicular to the optical axis.
  13. In Article 9, Each of the plurality of first driving arms includes a first driving groove configured to accommodate each of the plurality of first shape memory alloy wires, and An actuator for a camera, wherein each of the plurality of second driving arms comprises a second driving groove configured to accommodate each of the plurality of second shape memory alloy wires.
  14. In Article 13, An actuator for a camera, wherein each of the plurality of first shape memory alloy wires contacts the upper surface in the direction of the optical axis of the first driving groove.
  15. In Article 13, A camera actuator in which each of the plurality of second shape memory alloy wires contacts the lower surface in the optical axis direction of the second driving groove.
  16. In Article 9, An actuator for a camera, wherein each of the plurality of second driving arms is aligned with each of the plurality of first driving arms in the direction of the optical axis.
  17. Case with internal space, A lens module placed in the above internal space, A base disposed on one side of the above case, First, second, and third movable frames stacked in the optical axis direction on the above base, An image sensor mounted on the first moving frame, A first sensor driving unit comprising a plurality of first frame driving members and a plurality of first shape memory alloy (SMA) wires that are positioned on the outer edge of the first moving frame and interlock with each other to drive the first moving frame in a first direction perpendicular to the optical axis direction, A second sensor driving unit comprising a plurality of second frame driving members and a plurality of second shape memory alloy wires that are positioned on the outer edge of the second moving frame and interlock with each other to drive the second moving frame in a second direction perpendicular to the optical axis direction and the first direction, and A third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are positioned on the outer edge of the third moving frame and interlock with each other to drive the third moving frame to rotate with respect to the optical axis, and The plurality of first frame driving members includes a pair of first frame driving members, and Each of the above pair of first frame driving members is positioned on the diagonally opposite side of the second movable frame, and The plurality of second frame driving members above includes a pair of second frame driving members, and Each of the above pair of second frame driving members is a camera module positioned on the diagonally opposite side of the third moving frame.
  18. Case with internal space, A lens module placed in the above internal space, A base disposed on one side of the above case, First, second, and third movable frames stacked in the optical axis direction on the above base, An image sensor mounted on the first moving frame, A first sensor driving unit comprising a plurality of first frame driving members and a plurality of first shape memory alloy (SMA) wires that are positioned on the outer edge of the first moving frame and interlock with each other to drive the first moving frame in a first direction perpendicular to the optical axis direction, A second sensor driving unit comprising a plurality of second frame driving members and a plurality of second shape memory alloy wires that are positioned on the outer edge of the second moving frame and interlock with each other to drive the second moving frame in a second direction perpendicular to the optical axis direction and the first direction, and A third sensor driving unit comprising a plurality of third frame driving members and a plurality of third shape memory alloy wires that are positioned on the outer edge of the third moving frame and interlock with each other to drive the third moving frame to rotate with respect to the optical axis, and The plurality of third frame driving members includes a pair of third frame driving members and another pair of third frame driving members, and Each of the above pair of third frame driving members is positioned on the diagonally opposite side of the base, and A camera module in which each of the other pair of third frame driving members is arranged on the base symmetrically with respect to the pair of third frame driving members with respect to a straight line passing through the optical axis and parallel to the base.
  19. Case with internal space, A lens module placed in the above internal space, A first lens driving member comprising a first holder disposed to surround the lens module, and a plurality of first driving arms disposed on the side of the first holder and extending in all directions perpendicular to the optical axis, A second holder disposed to surround the lens module, and a plurality of second driving arms disposed on the side of the second holder and extending in all directions perpendicular to the optical axis, and a second lens driving member disposed on one surface of the first lens driving member along the optical axis. A plurality of first shape memory alloy wires (SMA), arranged to span across the plurality of first driving arms and configured to generate a driving force downward parallel to the optical axis, and A camera module comprising a plurality of second shape memory alloy wires arranged to span across the plurality of second driving arms and configured to generate a driving force upwardly parallel to the optical axis.
  20. In Article 19, A camera module further comprising an elastic member disposed between the first lens driving member and the second lens driving member.

Description

Actuator for camera and camera module including the same The present disclosure relates to an actuator for a camera and a camera module including the same. Recently, cameras have been standardly incorporated into portable electronic devices, including smartphones, tablet PCs, and laptop computers. As competition for product differentiation in portable electronic devices intensifies, there is an increasing number of cases where the functions of standard digital cameras are applied to the cameras in these devices. To generate high-resolution images, camera modules are equipped with actuators featuring focus adjustment and image stabilization functions. Consequently, there is a need to develop actuators capable of improving camera performance by controlling the operation of sensors and lens modules more precisely and diversely. FIG. 1 is a perspective view illustrating the exterior of a camera module according to one embodiment. FIG. 2 is a perspective view illustrating a first actuator that drives an image sensor of a camera module shown in FIG. 1 and a second actuator that drives a lens module. FIG. 3 is an exploded perspective view showing the first actuator shown in FIG. 2 disassembled. FIGS. 4a, FIGS. 4b, FIGS. 4d, and FIGS. 4e are perspective views illustrating the process of assembling the configuration of the first sensor driving unit. Figure 4c is a view of area A shown in Figure 4b from the x-axis direction. FIGS. 5A, FIGS. 5B, FIGS. 5D, and FIGS. 5E are perspective views illustrating the process of assembling the configuration of the second sensor driving unit. Figure 5c is a plan view of region B of Figure 5b viewed from the y-axis direction. FIGS. 6a to 6d are perspective views illustrating the process of assembling the configuration of the third sensor driving unit. FIGS. 7a to 7c are perspective views illustrating the process of assembling a base and a circuit board. FIGS. 8a to 8e are plan views illustrating the driving process of the first actuator. FIG. 9 is an exploded perspective view showing the second actuator shown in FIG. 2 disassembled. FIGS. 10a and FIGS. 10b are perspective views illustrating the assembly process of a part of the second actuator. FIG. 11a is an exploded perspective view showing a disassembled part of the configuration of the second actuator shown in FIG. 2. FIGS. 11b and FIGS. 11c are perspective views illustrating the arrangement of the fourth and fifth connecting members. FIG. 12a is an exploded perspective view showing a disassembled part of the configuration of the second actuator shown in FIG. 2. FIG. 12b is a perspective view illustrating the arrangement of the fourth shape memory alloy wire. FIG. 12c is a plan view illustrating the arrangement of the fourth shape memory alloy wire. FIG. 13a is an exploded perspective view showing a disassembled part of the configuration of the second actuator shown in FIG. 2. FIG. 13b is a perspective view illustrating the arrangement of the fifth shape memory alloy wire. FIG. 13c is a plan view illustrating the arrangement of the fifth shape memory alloy wire. FIG. 14 is a perspective view illustrating the lens module being driven in the direction of the optical axis. FIG. 15 is a perspective view illustrating the lens module rotating about the x-axis or y-axis. FIG. 16 is a perspective view illustrating the lens module tilting. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. In order to clearly explain the invention in the drawings, parts unrelated to the explanation have been omitted, and the same reference numerals have been used for identical or similar components throughout the specification. Furthermore, in the attached drawings, some components may be exaggerated, omitted, or schematically depicted, and the size of each component does not entirely reflect its actual size. The attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that all modifications, equivalents, and substitutions included within the concept and technical scope of the present invention are included. Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. Furthermore, when it is said that a part, such as a layer, membrane, region, or plate, is "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when it is said that a part is "directly above" another part, it means that there is no other part in between. Also, saying that a par