WO2023141779A1 - Actuator device for a camera and camera module comprising such actuator device - Google Patents

Actuator device for a camera and camera module comprising such actuator device Download PDF

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Publication number
WO2023141779A1
WO2023141779A1 PCT/CN2022/073871 CN2022073871W WO2023141779A1 WO 2023141779 A1 WO2023141779 A1 WO 2023141779A1 CN 2022073871 W CN2022073871 W CN 2022073871W WO 2023141779 A1 WO2023141779 A1 WO 2023141779A1
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WO
WIPO (PCT)
Prior art keywords
holder
arc
axis
camera
face
Prior art date
Application number
PCT/CN2022/073871
Other languages
French (fr)
Inventor
Kazuya Atsuta
Yusuke Ehara
Atsushi Yoneyama
Original Assignee
Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/CN2022/073871 priority Critical patent/WO2023141779A1/en
Publication of WO2023141779A1 publication Critical patent/WO2023141779A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/1822—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors comprising means for aligning the optical axis
    • G02B7/1827—Motorised alignment
    • G02B7/1828—Motorised alignment using magnetic means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0007—Movement of one or more optical elements for control of motion blur
    • G03B2205/0023—Movement of one or more optical elements for control of motion blur by tilting or inclining one or more optical elements with respect to the optical axis

Definitions

  • camera modules that comprise a zoom function a longer focus length is necessary for higher zoom factor, and thus dioptric systems are used in order to avoid camera modules from growing in size.
  • camera modules that comprise an actuator device for the camera which includes an optical image stabilization function with a catoptric system including a reflective member such as a prism or a mirror, are proposed as camera modules using such a dioptric system.
  • the above actuator device has the following problems that:
  • the width of the actuator device tends to be wider
  • actuator devices comprise: a prism as a reflecting member; a holder for holding the prism; a rotating plate for rotatably holding the holder about a first axis; a case for rotatably holding the rotating plate about a second axis perpendicular to the first axis; and an actuator for rotating the holder about the first and second axis in relation to the case, and allows the holder to rotate about the first axis by using bearings are disposed between the holder and the rotating plate and allows the rotating plate to rotate about the second axis by using bearings are disclosed between the rotating plate and the case.
  • the above actuator device has the following problems that:
  • the width of the actuator device tends to be wider which is the same as the former actuator device
  • the positional relationship in the actuator is easy to change when rotating the reflecting member in any of the first and second axes, and this can affect the thrust force.
  • the present invention proposes the following means.
  • An actuator device for a camera comprising: a reflecting member for deflecting incident light toward a different direction on a reflecting plane;
  • a first holder for holding the reflecting member
  • a second holder for supporting the first holder so as to move the first holder about a first axis
  • a base for supporting the second holder so as to move the second holder about a second axis unparallel to the first axis;
  • the portion of the second holder that supports the first holder and the portion of the base that supports the second holder are located behind the reflecting plane, and since the first and second actuators, which allow the reflective member to rotate around the first and second axes relative to base, are also located behind the reflecting plane which prevents them from moving laterally from the reflecting member, the size of the actuator device for a camera in the width direction can be reduced, and thus the actuator device for a camera can be made compact
  • the first actuator may be provided between the reflecting member and the second holder.
  • the first actuator which rotates the first holder holding the reflecting member about the first axis, near the first holder which is a subject to be rotated, a space behind the first holder can be effectively utilized for arranging the first actuator.
  • the second actuator may be provided between the first holder and the base.
  • the second actuator which rotates the second holder about the second axis, near the second holder which is a subject to be rotated, a space behind the second holder can be effectively utilized for arranging the second actuator.
  • first holder may be formed with a first arc guided face for rotating the first holder about the first axis in relation to the second holder
  • second holder may be formed with a first arc guiding face for guiding the first arc guided face
  • first bearing may be disposed between the first arc guided face and the first arc guiding face.
  • the movement of the first arc guided face on the first guiding face becomes more stable.
  • any possible misalignment of the rotational center of the first axis which can occur when manufacturing the first arc guiding face and the first arc guided face, can be eliminated.
  • At least one of the first arc guided face and the first arc guiding face may be formed with a first guiding groove that extends about the first axis and limits the movement of the first bearing to the movement about the first axis.
  • the movement direction of the first arc guided face in relation to the first guiding face is limited to the direction about the first axis by means of the first bearing and the first guiding groove, the rotation of the first holder about the first axis in relation to the second holder becomes more stable.
  • the second holder may be formed with a second arc guided face for rotating the second holder about the second axis in relation to the base, and, the base may be formed with a second arc guiding face for guiding the second arc guided face.
  • the second arc guided face since when rotating the second holder about the second axis in relation to the base, the second arc guided face is guided along the second guiding face of the base, the rotational movement of the second holder about the second axis is stable.
  • the second arc guiding face guides the second arc guided face, the change in the rotational center of the second holder can be inhibited.
  • a second bearing may be disposed between the second arc guided face and the second arc guiding face.
  • the movement of the second arc guided face on the second guiding face becomes more stable.
  • any possible misalignment of the rotational center of the second axis which can occur when manufacturing the second arc guiding face and the second arc guided face, can be eliminated.
  • At least one of the second arc guided face and the second arc guiding face may be formed with a second guiding groove extending about the second axis and limiting the movement of the second bearing to the movement about the second axis.
  • the first actuator may comprise: a first coil, a first magnet and a first attracting yoke, one of: (i) the first coil and the first attracting yoke; and (ii) the first magnet may be provided on the first holder, and the other of: (i) the first coil and the first attracting yoke; and (ii) the first magnet may be provided on the second holder.
  • the first holder which holds the reflecting member, is rotated about the first axis in relation to the second holder.
  • the first attracting yoke is provided on one of the first holder and the second holder, the first holder is aligned in relation to the second holder when the first coil is not applied with current, and the first holder returns to a rest position in relation to the second holder.
  • the second actuator may comprise: a second coil, a second magnet and a second attracting yoke, one of: (i) the second coil and the second attracting yoke; and (ii) the second magnet may be provided on the second holder, and the other of: (i) the second coil and the second attracting yoke; and (ii) the second magnet may be provided on the base.
  • the second holder by applying current to the second coil to generate magnetic field, the second holder is rotated about the second axis in relation to the base.
  • the second holder since the second attracting yoke is provided, the second holder is aligned in relation to the base when the second coil is not applied with current, and the second holder returns to a rest position in relation to the base.
  • first axis may extend in parallel to the reflecting face.
  • the swing span of the reflecting member and the first holder when rotating the first holder, which holds the reflecting member, about the first axis can be limited.
  • change in thrust force of the first holder in relation to the second holder by the first actuator becomes smaller, this can avoid the first actuator from becoming larger, and reduce the size of the actuator device for a camera, and thus the actuator device for a camera can be made compact.
  • a camera module according to this invention comprises the above mentioned actuator device for a camera.
  • the size of the actuator device for a camera in the width direction can be reduced, and thus the camera module can be made compact.
  • the size of the actuator device for the camera in the width direction can be reduced, and thus the actuator device for the camera and the camera module can be made compact.
  • Figure 1 shows a perspective view of the actuator device for a camera according to an embodiment of the present invention.
  • Figure 2 shows an exploded view of the actuator device for a camera shown in Figure 1.
  • Figure 3 shows a perspective view of a par of the actuator device for a camera shown in Figure 1.
  • Figure 4 shows a perspective view of a reflecting member and a first holder show in Figure 1.
  • Figure 5 shows a perspective view of a second holder shown in Figure 1.
  • Figure 6 also shows a perspective view of the second holder shown in Figure 1.
  • the second holder 14 includes: a pair of second holder side walls 51; and a second holder connector 52 for connecting the pair of second holder side walls 51.
  • the second arc groove 51B is V-shaped in its cross section in relation to its extending direction, and first bearings 53 are disposed between the first arc grooves 41D and the second arc grooves 51B, respectively (refer to Figure 10 (a) ) .
  • the second holder connector 52 is a triangular prism which extends in the lateral direction, and the upper face of the second holder connector 52 inclines downwardly from its rear side to its front side, in other words, extends in substantially parallel to the reflecting plane 12A.
  • the upper plane 52 of the second holder connector 52 is formed with a first magnet receiving recess 52A denting rearwardly and receiving a first magnet 81, which will be described, and the rear plane of the second holder connector 52 is formed with a second magnet receiving recess 52B denting forwardly and receiving a second magnet 91, which will be described.
  • the middle portion along the lateral direction of the upper end of the second holder connector 52 is formed with a guided protrusion 52C protruding upwardly.
  • the rear plane of the guided protrusion 52C is formed with a third arc guided face 52D protruding rearwadly.
  • the arc third guided face 52D is located behind the reflecting plane 12A.
  • the third arc guided face 52D extends along a peripheral direction about the Y-axis, and the third arc guided face 52D is formed with a fourth arc groove (a second guiding groove) 52E.
  • the fourth arc groove 52E is U-shaped in its cross section in relation to its extending direction.
  • the base 15 is L-shaped, and includes: a bottom wall 61 which is a plate which extends in the XZ plane and is rectangular in the top view; and a rear wall 62 which is a plate which extends in the XY plane and is rectangular in the front view.
  • the bottom wall 61 supports the second holder 14.
  • the rear end of the bottom wall 61 is formed with second guiding protrusions 61A protruding upwardly, and the front and inward side in the lateral direction of the second guiding protrusion 61A is formed with a second arc guiding face 61B denting rearwardly and inwardly in the lateral direction.
  • These second arc guiding faces 61B are located behind the reflecting plane 12A.
  • the second arc guiding faces 61B correspond to the second arc guided faces 51D, respectively, and extend along a peripheral direction about the Y-axis.
  • the second arc guiding faces 61B are formed with fifth arc grooves (second guiding grooves) 61C extending along a peripheral direction of the Y-axis.
  • the fifth arc groove 61C is V-shaped in its cross section in relation to its extending direction (refer to Figure 10 (b) ) .
  • the upper end of the rear wall 62 is formed with a third guiding protrusion 62A protruding forwardly, and the front plane of the third guiding protrusion 62A is formed with a third arc guiding face 62B denting rearwadly.
  • the third arc guiding face 62B is located behind the reflecting plane 12A.
  • the third arc guiding face 62B corresponds to the third arc guided face 52D, and extends in a peripheral direction about the Y-axis.
  • the third arc guiding face 62B is formed with a sixth arc groove (a second guiding groove) 62C.
  • the sixth arc guiding groove 62C is U-shaped in its cross section in relation to its extending direction.
  • Second bearings 63 is disposed between the third arc grooves 51E and the fifth arc grooves 61C and between the fourth arc groove 52E and the sixth arc groove 62C, respectively.
  • the front face of the central portion of the rear wall 62 is formed with a second yoke receiving recess 62D receiving a second attracting yoke 93 which will be described.
  • the actuator 16 comprises: a first actuator 71 for moving the first holder 13 about the X-axis in relation to the second holder 14; and a second actuator 72 for moving the second holder 14 about the Y-axis in relation to the base 15; and a FPC board 73 for driving the first and second actuators 71, 72.
  • the first actuator 71 includes: the first magnet 81; a first coil 82 which is located on the FPC board 73 and generates magnetic force to the first magnet 81; the first attracting yoke 83 attached to the first holder inclining wall 42 of the first holder 13; and a first hall effect element 84 disposed on the FPC board 73.
  • the first magnet 81 is a rectangular plate extending in parallel to the reflecting plane 12a, and is disposed in the first magnet receiving recess 52A of the second holder 14.
  • the first magnet 81 includes two first magnetic portions 81A, 81B extending in the lateral direction and arranged in forward-rearward direction in relation to each other.
  • the magnetic pole of a plane facing the reflecting plane 12A of one of two first magnetic portions 81A, 81B is different from that of the other of two first magnetic portions 81A, 81B.
  • the first coil 82 is disposed on the rear face of the first holder inclining wall 42.
  • the first attracting yoke 83 is received in the first yoke receiving recess 42A.
  • the first coil 82 and the first hall effect element 84 are disposed between the first holder inclining wall 42 of the first holder 13 and the fist magnet 81.
  • the first magnet 81, the first coil 82 and the first attracting yoke 83 are disposed near the center of rotating about the X-axis of the reflecting plane 12.
  • the second actuator 72 includes: the second magnet 91; a second coil 92 which is located on the FPC board 73 and generates magnetic force to the second magnet 91; the second attracting yoke 93 attached to the rear wall 62 of the base 15; and a second hall effect element 94 disposed on the FPC board 73.
  • the second magnet 91 is a rectangular plate extending in the upward- downward direction and the lateral direction, and is disposed in the second magnet receiving recess 52B of the second holder 14.
  • the second magnet 91 includes two pairs of second magnetic portions 91A to 91D extending in the upward-downward direction and arranged in the lateral direction in relation to each other.
  • the magnetic pole of a plane facing forward of one of four second magnetic portions 91A to 91D is different from that of other of four second magnetic portions 91A to 91D which is adjacent to the one of four second magnetic portions 91A to 91D.
  • the second coil 92 is disposed on the front face side of the rear wall 62 of the base 15, and one of the pair of second coils 92 faces one pair of second magnetic portions 91A, 91B of the second magnet 91 and the other pair of the second magnetic portions 91C, 91D face the other of the pair of second coils 92.
  • the second hall effect element 94 is disposed between the pair of the second coils 92.
  • the second coils 92 and the second hall effect element 94 are disposed between the rear wall 62 of the second holder 14 and the second magnet 91.
  • An external output terminal 73A of the FPC board 73 is connected to a control (not shown) of the actuator device 1 for a camera.
  • the actuator device 1 for a camera which has the above configuration, configures a camera module together with a lens module to which light outgoing from the outgoing plane 12C of the reflecting member 12 enters.
  • the specific configuration of the lens module is not described in the specification.
  • a vibration sensor which is separately provided, detects the vibration.
  • the above controller connected to the actuator 16 determines the current amount for the first and second coils 82, 92 based on the detected result, and applies the current with the determined current amount to at least one of the first and second coils 82, 92.
  • the first coil 82 When applying the current to the first coil 82, the first coil 82 generates magnetic field in accordance with the current direction. In accordance with the magnetic field generated by the first coil 82 and the magnetic field of the first magnet 81, the first holder 13 holding the reflecting member 12 rotates about the X-axis in relation to the second holder 14. The first hall effect element 84 detects the rotational amount of the first holder 13 in relation to the second holder 14.
  • the first arc guided faces 41C of the first holder 13 are guided along the first arc guiding faces 51A of the second holder 14 such that the first holder 13 rotates about the X-axis in relation to the second holder 14. Since the first arc guided faces 41C are formed with the first arc grooves 41D and the first arc guiding faces 51A are formed with the second arc grooves 51B, and the first bearings 53 are disposed between the first arc grooves 41D and the second arc grooves 51B, respectively, the movement direction of the first holder 13 in relation to the second holder 14 is limited to the extending direction of the first and second arc grooves 41D, 51B, in other words, in a peripheral direction about the X-axis.
  • first bearings 53 are disposed between the first arc guided faces 41C and the first arc guiding faces 51A, respectively, and three-point suspension forms a curved plane extending about the X-axis, supporting the first arc guided facets 41C of the first holder 13 by the fist arc guiding faces 51A of the second holder 14 and rotating the first holder 13 in relation to the second holder 14 are stable, and the change in the posture of the first holder 13 is reduced.
  • the first magnet 81 and the first coil 82 are disposed in substantially parallel to the reflecting plane 12A of the reflecting member 12 near the rotational enter about the X-axis of the reflecting member 12, even when the reflecting member 12 and thus the first holder 13 rotates about the X-axis, the change in the distance between the first magnet 81 and the first coil 82 is small. Thus, the change in the thrust force of the first holder 13 by the magnetic field generated by the first coil 82 is reduced.
  • the first holder 13 rotates about the X-axis in relation to the second holder 14.
  • the second coils 92 when applying the current to the second coils 92, the second coils 92 generate magnetic field in accordance with the current direction.
  • the second holder 14 rotates about the Y-axis in relation to the base 15.
  • the second hall effect element 94 detects the rotational amount of the second holder 14 in relation to the base 15.
  • the second arc guided faces 51D and the third arc guided face 52D of the second holder 14 are guided along the second arc guiding faces 61B and the third arc guiding face 62B such that the second holder 14 rotates about the Y-axis in relation to the base 15.
  • the second and third arc guided faces 51d, 52D are formed with the third and fourth arc grooves 51E, 52E and the second and third arc guiding faces 61B, 62B are formed with the fifth and sixth arc grooves 61C, 62C, and the second bearings 63 are disposed between the third and fourth arc grooves 51E, 52E and the fifth and sixth arc grooves 61C, 62C, respectively
  • the movement direction of the second holder 14 in relation to the base 15 is limited to the extending direction of the third to sixth arc grooves 51E, 52E, 61C, 62C, in other words, in a peripheral direction about the Y-axis.
  • the second magnet 91 and the second coils 92 are disposed in substantially parallel to the XY plane, even when the second holder 14 rotates about the Y-axis in relation to the base 15, the change in the distance between the second magnet 91 and the second coils 92 is small. Thus, the change in the thrust force of the second holder 14 by the magnetic field generated by the second coils 92 are reduced.
  • the first holder 13 holding the reflecting member 12 is rotated about the X-axis in relation to the second holder 14.
  • the first attracting yoke 83 is provided on the first holder 13
  • the first holder 13 is aligned in relation to the second holder 14 when the first coil 83 is not applied with current.
  • the second holder 14 is rotated about the Y-axis in relation to the base 15.
  • the second attracting yoke 93 is provided on the second holder 14, the second holder 14 is aligned with the base 15 when the second coils 92 are not applied with current.
  • the reflecting member can be made by other member such as a mirror other than a prism.
  • the first actuator can be disposed on other position other than a position between the reflecting member and the second holder.
  • the second actuator can be disposed on other position other than a position between the second holder and the base.
  • the first holder can be disposed on other position.
  • the first holder is configured to rotate about the X-axis by guiding the arc guided faces formed on the first holder by means of the arc guiding faces formed on the second holder, the first holder can rotate about the X-axis by means of other configuration such as leaf springs.
  • the second holder can be disposed on other position.
  • the second holder is configured to rotate about the Y-axis by guiding the arc guided faces formed on the second holder by means of the arc guiding faces formed on the base, the second holder can rotate about the Y-axis by means of other configuration such as leaf springs.
  • the cross-sectional shapes of the arc grooves are not limited to V-shape or U-shape, and can has other shapes.
  • arc grooves it is possible for arc grooves not to be formed on the arc guided faces and the arc guiding faces.
  • bearings are guided by the arc grooves, it is possible for bearings not to be provided on the arc grooves.
  • other configuration can be used for guiding the arc guided faces in relation to the arc guiding faces, by providing guiding protrusion on one of the arc guided face and the arc guiding face, which protrudes toward the other of the arc guided face and the arc guiding face, and providing a guiding groove on the other of the arc guided face and the arc guiding face, which receives the guiding protrusion to guide the rotation about the axis.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

An actuator device (1) for a camera, comprises: a reflecting member (12) for deflecting incident light toward a different direction on a reflecting plane (12A); a first holder (13) for holding the reflecting member (12); a second holder (14) for supporting the first holder (13) so as to move the first holder (13) about a first axis; a base (15) for supporting the second holder (14) so as to move the second holder (14) about a second axis unparallel to the first axis; a first actuator (71) for moving the first holder (13) about the first axis in relation to the second holder (14); and a second actuator (72) for moving the second holder (14) about the second axis in relation to the base (15),wherein a portion of the second holder (14) which supports the first holder (13) and a portion of the base (15) which supports the second holder (14), and the first and second actuators (71, 72) are located behind the reflecting plane (12A).

Description

ACTUATOR DEVICE FOR A CAMERA AND CAMERA MODULE COMPRISING SUCH ACTUATOR DEVICE TECHNICAL FIELD
This invention relates to an actuator device for a camera and a camera module comprising such an actuator device.
BACKGROUND ART
Conventionally, mobile devices such as smart phones and tablet PCs comprise a camera module. Recently, the performance and functionality of the camera in compact mobile devices have been significantly improved, camera modules with a zoom function have also been provided.
In such camera modules that comprise a zoom function, a longer focus length is necessary for higher zoom factor, and thus dioptric systems are used in order to avoid camera modules from growing in size. In addition, camera modules that comprise an actuator device for the camera, which includes an optical image stabilization function with a catoptric system including a reflective member such as a prism or a mirror, are proposed as camera modules using such a dioptric system.
Some of the above actuator devices comprise: a prism as a reflecting member; a holder for holding the prism; a case for holding the holder via leaf springs; and an actuator for rotating the holder about a rotational axis, and rotates the holder by using the leaf springs.
However, the above actuator device has the following problems that:
- Because the leaf springs are laterally located from the reflecting member, the width of the actuator device tends to be wider;
- Because the leaf springs can bend due to the weight of the reflecting member and the holder, the rotational center of the reflecting member and the holder can be changed; and
- Although more rigid leaf springs can be used in order to prevent the change in the rotational center, because driving force required for rotating the reflecting member and the holder would be larger, the actuator could be larger.
Other some other of the above actuator devices comprise: a prism as a reflecting member; a holder for holding the prism; a rotating plate for rotatably holding the holder about a first axis; a case for rotatably holding the rotating plate about a second axis perpendicular to the first axis; and an actuator for rotating the holder about the first and second axis in relation to the case, and allows the holder to rotate about  the first axis by using bearings are disposed between the holder and the rotating plate and allows the rotating plate to rotate about the second axis by using bearings are disclosed between the rotating plate and the case.
However, the above actuator device has the following problems that:
- Because the first and second axes are located behind the reflecting member, the swing span of the reflecting member would be large when rotating the reflecting member about the first and the second axes;
- Because the actuator is laterally located from the reflecting member, the width of the actuator device tends to be wider which is the same as the former actuator device;
- Because the length between the center of gravity of the reflecting member and the first and second axes is large, the thrust force required to rotate the reflecting member about the first and second axes would be large, and larger magnets and larger coils would be necessary, and thus the actuator could be larger; and
- The positional relationship in the actuator is easy to change when rotating the reflecting member in any of the first and second axes, and this can affect the thrust force.
DISCLOSURE OF THE INVENTION
In order to solve the above problems, the present invention proposes the following means.
An actuator device for a camera comprising: a reflecting member for deflecting incident light toward a different direction on a reflecting plane;
a first holder for holding the reflecting member;
a second holder for supporting the first holder so as to move the first holder about a first axis;
a base for supporting the second holder so as to move the second holder about a second axis unparallel to the first axis;
a first actuator for moving the first holder about the first axis in relation to the second holder; and
a second actuator for moving the second holder about the second axis in relation to the base, and
wherein a portion of the second holder which supports the first holder and a portion of the base which supports the second holder, and the first and second actuators are located behind the reflecting plane.
According to this invention, since the portion of the second holder that supports the first holder and the portion of the base that supports the second holder are located behind the reflecting plane, and since the first and second actuators, which allow the reflective member to rotate around the first and second axes relative to base, are also located behind the reflecting plane which prevents them from moving laterally  from the reflecting member, the size of the actuator device for a camera in the width direction can be reduced, and thus the actuator device for a camera can be made compact
In addition, in the actuator device according to the invention, the first actuator may be provided between the reflecting member and the second holder.
According to this invention, by arranging the first actuator, which rotates the first holder holding the reflecting member about the first axis, near the first holder which is a subject to be rotated, a space behind the first holder can be effectively utilized for arranging the first actuator.
In addition, the second actuator may be provided between the first holder and the base.
According to this invention, by arranging the second actuator, which rotates the second holder about the second axis, near the second holder which is a subject to be rotated, a space behind the second holder can be effectively utilized for arranging the second actuator.
In addition, the first holder may be formed with a first arc guided face for rotating the first holder about the first axis in relation to the second holder, and wherein the second holder may be formed with a first arc guiding face for guiding the first arc guided face.
According to this invention, since when rotating the first holder about the first axis in relation to the second holder, the first arc guided face is guided along the first guiding face of the second holder, the rotational movement of the first holder about the first axis is stable. In addition, since the first arc guiding face guides the first arc guided face, the change in the rotational center of the first holder can be inhibited, different from above mentioned leaf springs which can bend due to the weight of the reflecting member and the holder. Moreover, by changing the shapes of the first arc guided face and the first arc guiding face, it is possible to adjust the rotational center of the first holder in relation to the second holder.
In addition, the first bearing may be disposed between the first arc guided face and the first arc guiding face.
According to this invention, by reducing contact area between the first arc guiding face and the first arc guided face by means of the first bearing so as to reduce the friction, the movement of the first arc guided face on the first guiding face becomes more stable. In addition, by changing the size of the first bearing, any possible misalignment of the rotational center of the first axis, which can occur when manufacturing the first arc guiding face and the first arc guided face, can be eliminated.
In addition, at least one of the first arc guided face and the first arc guiding face may be formed with a first guiding groove that extends about the first axis and  limits the movement of the first bearing to the movement about the first axis.
According to this invention, since the movement direction of the first arc guided face in relation to the first guiding face is limited to the direction about the first axis by means of the first bearing and the first guiding groove, the rotation of the first holder about the first axis in relation to the second holder becomes more stable.
In addition, the second holder may be formed with a second arc guided face for rotating the second holder about the second axis in relation to the base, and, the base may be formed with a second arc guiding face for guiding the second arc guided face.
According to this invention, in the same vein as mentioned above, since when rotating the second holder about the second axis in relation to the base, the second arc guided face is guided along the second guiding face of the base, the rotational movement of the second holder about the second axis is stable. In addition, since the second arc guiding face guides the second arc guided face, the change in the rotational center of the second holder can be inhibited. Moreover, by changing the shapes of the second arc guided face and the second arc guiding face, it is possible to adjust the rotational center of the second holder in relation to the base.
In addition, a second bearing may be disposed between the second arc guided face and the second arc guiding face.
According to this invention, in the same vein as mentioned above, the movement of the second arc guided face on the second guiding face becomes more stable. In addition, by changing the size of the second bearing, any possible misalignment of the rotational center of the second axis, which can occur when manufacturing the second arc guiding face and the second arc guided face, can be eliminated.
In addition, at least one of the second arc guided face and the second arc guiding face may be formed with a second guiding groove extending about the second axis and limiting the movement of the second bearing to the movement about the second axis.
According to this invention, in the same vein as mentioned above, since the movement direction of the second arc guided face in relation to the second guiding face is limited to the direction about the second axis, the rotation of the second holder about the second axis in relation to the base becomes more stable.
In addition, the first actuator may comprise: a first coil, a first magnet and a first attracting yoke, one of: (i) the first coil and the first attracting yoke; and (ii) the first magnet may be provided on the first holder, and the other of: (i) the first coil and the first attracting yoke; and (ii) the first magnet may be provided on the second holder.
According to this invention, by applying current to the first coil to generate a  magnetic field, the first holder, which holds the reflecting member, is rotated about the first axis in relation to the second holder. In addition, since the first attracting yoke is provided on one of the first holder and the second holder, the first holder is aligned in relation to the second holder when the first coil is not applied with current, and the first holder returns to a rest position in relation to the second holder.
In addition, the second actuator may comprise: a second coil, a second magnet and a second attracting yoke, one of: (i) the second coil and the second attracting yoke; and (ii) the second magnet may be provided on the second holder, and the other of: (i) the second coil and the second attracting yoke; and (ii) the second magnet may be provided on the base.
According to this invention, in the same vein as mentioned above, by applying current to the second coil to generate magnetic field, the second holder is rotated about the second axis in relation to the base. In addition, since the second attracting yoke is provided, the second holder is aligned in relation to the base when the second coil is not applied with current, and the second holder returns to a rest position in relation to the base.
In addition, the first axis may extend in parallel to the reflecting face.
According to this invention, the swing span of the reflecting member and the first holder when rotating the first holder, which holds the reflecting member, about the first axis can be limited. Thereby, change in thrust force of the first holder in relation to the second holder by the first actuator becomes smaller, this can avoid the first actuator from becoming larger, and reduce the size of the actuator device for a camera, and thus the actuator device for a camera can be made compact.
In addition, a camera module according to this invention comprises the above mentioned actuator device for a camera.
According to this invention, in the same vein as mentioned above, the size of the actuator device for a camera in the width direction can be reduced, and thus the camera module can be made compact.
According to the actuator device for the camera and the camera module of this invention, the size of the actuator device for the camera in the width direction can be reduced, and thus the actuator device for the camera and the camera module can be made compact.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a perspective view of the actuator device for a camera according to an embodiment of the present invention.
Figure 2 shows an exploded view of the actuator device for a camera shown in Figure 1.
Figure 3 shows a perspective view of a par of the actuator device for a camera  shown in Figure 1.
Figure 4 shows a perspective view of a reflecting member and a first holder show in Figure 1.
Figure 5 shows a perspective view of a second holder shown in Figure 1.
Figure 6 also shows a perspective view of the second holder shown in Figure 1.
Figure 7 also shows a perspective view of the second holder shown in Figure 1.
Figure 8 shows a perspective view of a base show in Figure 1.
Figure 9 also shows a perspective view of the base shown in Figure 1.
Figure 10 Figure 10 (a) shows a relationship between the first holder and the second holder shown in Figure 1, and Figure 10 (b) shows a relationship between the second holder and the base.
DETAILED DESCRIPTION OF EMBODIMENTS
Hereinafter, one embodiment of the actuator device for a camera according to the present invention will be described, based on the figures.
The actuator device 1 for a camera according to the present embodiment is used together with a lens module (not shown) in a camera module of mobile devices such as smart phones and tablet PCs. As shown in Figures 1 and 2, the actuator device 1 for a camera comprises: a cover 11; a reflecting member 12 for deflecting an incident light to a different direction, in particular toward said lens module, on a reflecting surface 12A; a first holder 13 for holding the reflecting member 12; a second holder 14 for supporting the first holder 13 so as to be movable about an X-axis (a first axis) ; a base 15 for supporting the second holder 14 so as to be movable about a Y-axis (a second axis) perpendicular to the X-axis; and an actuator 16 for moving the first holder 13, the second holder 14 and the base 15 in relation to each other.
In the following description, a direction of the incident light toward the reflective member 12 in Figure 1 will be referred as a downward direction, and its opposing direction will be referred as an upward direction, a direction of an outgoing light from the reflecting member 12 will be referred as a forward direction, and its opposing direction will be referred as a rearward direction, and a direction perpendicular to the upward-downward direction and the forward-rearward direction will be referred as a lateral direction.
The cover 11 has a rectangular parallelepiped shape which opens downwardly, and comprises: a top wall 21 which extends in an X-Z plane and is rectangular in a top view; a peripheral wall 22 which extends downwardly from the circumference edge of the top wall 21 and has a rectangular cylinder shape.
The top wall 21 is formed with an incident light opening 21A which  penetrates the top wall 21 in the upward-downward direction and exposes an incidence plane 12B, which will be described, of the reflecting member 12. The incident light opening 21A has a rectangular shape in a top view, for example.
A front wall 23 of the peripheral wall 22, which extends in the X-Y plane and is rectangular in a front view, is formed with an outgoing light opening 23A which penetrates the front wall 23 in the forward-rearward direction and exposes the outgoing plane 12C of the reflecting member 12, which will be described. The outgoing light opening 23A has an octagon shape in a front view, for example.
The reflecting member 12 is a prism which is a triangular prism, and includes the incident plane 12B which extends in the X-Z plane and is rectangular in a top view; and the outgoing plane 12C which extends in the X-Y plane and is rectangular in a front view. The incident plane 12A inclines downwardly from its rearward edge to its forward edge, and reflects light incoming the incident plane 12B in the Y-axis direction so as to output from the outgoing plane 12C in the Z-axis direction.
The top plane of the reflecting member 12 is provided with a cover plate member 31 which extends in the X-Z plane and is rectangular in a top view. The cover plate member 31 is formed with an exposing opening 31A which expose the incident plane 12B and is rectangular in a top view. The length in the X-axis direction of the actuator device 1 for a camera is 1.5 times or less of the length in the X-axis direction of the reflecting member 12.
As shown in Figures 2 to 4, the first holder 13 includes: a pair of first side walls 41 located on both lateral sides; and a first holder inclining wall 42 connecting the lower edges of the pair of the first holder side walls 41.
The first holder side walls 41 are plates which extend in the Y-Z plane and the first holder side walls 41 are rectangular triangle in a side view, and the first holder side wall 41 is formed with penetrating slits 41A which penetrate the first holder side wall 41 in the lateral direction. The penetrating slits 41A extend downwardly from its rear side to its front side, and extend in substantially parallel to the reflecting plane 12A. In addition, the lower edge of the first holder side wall 41 is formed with a guiding protrusion 41B which protrudes in a direction substantially perpendicular to the reflecting plane 12A in the Y-Z plane. The lower edge of the guiding protrusion 41B has an arc shape which extends along a peripheral direction about the X-axis. The lower edge of the guiding protrusion 41B constitutes a first arc guided face 41C. These first arc guided faces 41C are located behind the reflecting plane 12A.
The first arc guided faces 41C are formed with first arc grooves (first guiding grooves) 41D which extend in an arc manner along a peripheral direction about the X-axis. The first arc guided face 41C of one of the pair of guiding protrusions 41B, which is located on a right side, is formed with two first arc grooves 41D spaced in a peripheral direction about the X-axis, and the first arc guided face 41C of the other of  the pair of guiding protrusions 41B, which is located on a left side, is formed with one first arc groove 41D in a middle portion along a peripheral direction about the X-axis. The two first arc grooves 41D formed on the first arc guided face 41C of the right guiding protrusion 41B are formed on the both ends of the first arc guided face 41C in the peripheral direction about the X-axis. The first arc groove 41D is V-shaped in its cross section in relation to its extending direction (refer to Figure 10 (a) ) .
The first holder inclining wall 42 is a rectangular plate which extends in a plane parallel to the reflecting plane 12a of the reflecting member 12, and inclines downwardly from its rear edge to its front edge. The reflecting member 12 is disposed on the upper face of the first holder inclining wall 42. In addition, a center potion of a back face of the first holder inclining wall 42 is formed with a first yoke receiving recess 42A for receiving a first attracting yoke 83 which will be described.
Said reflecting member 12 is hold by the pair of first holder side walls 41 and the first holder inclining wall 42.
As shown in Figures 2 and 5 to 7, the second holder 14 includes: a pair of second holder side walls 51; and a second holder connector 52 for connecting the pair of second holder side walls 51.
The second holder side wall 51 is a plate which extends in the YZ plane and the second holder side wall 51 is rectangular triangle in a side view, and the upper edge of the second holder side wall 51 inclines downwards from its rear side to its front side. The front portion of the second holder side wall 51 is formed with an arched recess. The bottom face of the recess of the second holder side wall 51 forms a first arc guiding face 51A supporting the first holder 13. These first arc guiding faces 51A are located behind the reflecting face12A.
The arc guiding face 51A has an arc shape corresponding to the first arc guided face 41C, and the first arc guiding faces 51A are formed with second arc grooves (first guiding grooves) 51B which extend in an arc manner along a peripheral direction about the X-axis. The first arc guiding face 51A of one of the pair of second holder side walls 51, which is located on a right side, is formed with two second arc grooves 51B spaced in a peripheral direction about the X-axis, and the first arc guiding face 51A of the other of the pair of second holder side walls 51, which is located on a left side, is formed with one second arc groove 51B in a middle portion along a peripheral direction about the X-axis. The second arc groove 51B is V-shaped in its cross section in relation to its extending direction, and first bearings 53 are disposed between the first arc grooves 41D and the second arc grooves 51B, respectively (refer to Figure 10 (a) ) .
Further, the lower edge of the rear face of the second holder side wall 51 is formed with a guiding recess 51C dented forwardly. The guiding recess 51C is formed with an arc guided face 51D protruding rearwardly and outwardly in the lateral  direction. These second arc guided faces 51D are located behind the reflecting plane 12A. The second arc guided face 51D extends along a peripheral direction about the Y-axis, and the second guided faces 51D are formed with third arc grooves (second guiding grooves) 51E extending along an peripheral direction about the Y-axis (refer to Figure 10 (b) ) .
The second holder connector 52 is a triangular prism which extends in the lateral direction, and the upper face of the second holder connector 52 inclines downwardly from its rear side to its front side, in other words, extends in substantially parallel to the reflecting plane 12A. The upper plane 52 of the second holder connector 52 is formed with a first magnet receiving recess 52A denting rearwardly and receiving a first magnet 81, which will be described, and the rear plane of the second holder connector 52 is formed with a second magnet receiving recess 52B denting forwardly and receiving a second magnet 91, which will be described.
The middle portion along the lateral direction of the upper end of the second holder connector 52 is formed with a guided protrusion 52C protruding upwardly. The rear plane of the guided protrusion 52C is formed with a third arc guided face 52D protruding rearwadly. The arc third guided face 52D is located behind the reflecting plane 12A. The third arc guided face 52D extends along a peripheral direction about the Y-axis, and the third arc guided face 52D is formed with a fourth arc groove (a second guiding groove) 52E. The fourth arc groove 52E is U-shaped in its cross section in relation to its extending direction.
The base 15 is L-shaped, and includes: a bottom wall 61 which is a plate which extends in the XZ plane and is rectangular in the top view; and a rear wall 62 which is a plate which extends in the XY plane and is rectangular in the front view.
The bottom wall 61 supports the second holder 14. In addition, the rear end of the bottom wall 61 is formed with second guiding protrusions 61A protruding upwardly, and the front and inward side in the lateral direction of the second guiding protrusion 61A is formed with a second arc guiding face 61B denting rearwardly and inwardly in the lateral direction. These second arc guiding faces 61B are located behind the reflecting plane 12A. The second arc guiding faces 61B correspond to the second arc guided faces 51D, respectively, and extend along a peripheral direction about the Y-axis. In addition, the second arc guiding faces 61B are formed with fifth arc grooves (second guiding grooves) 61C extending along a peripheral direction of the Y-axis. The fifth arc groove 61C is V-shaped in its cross section in relation to its extending direction (refer to Figure 10 (b) ) .
The upper end of the rear wall 62 is formed with a third guiding protrusion 62A protruding forwardly, and the front plane of the third guiding protrusion 62A is formed with a third arc guiding face 62B denting rearwadly. The third arc guiding face 62B is located behind the reflecting plane 12A. The third arc guiding face 62B  corresponds to the third arc guided face 52D, and extends in a peripheral direction about the Y-axis. In addition, the third arc guiding face 62B is formed with a sixth arc groove (a second guiding groove) 62C. The sixth arc guiding groove 62C is U-shaped in its cross section in relation to its extending direction. Second bearings 63 is disposed between the third arc grooves 51E and the fifth arc grooves 61C and between the fourth arc groove 52E and the sixth arc groove 62C, respectively.
The front face of the central portion of the rear wall 62 is formed with a second yoke receiving recess 62D receiving a second attracting yoke 93 which will be described.
As shown in Figures 1 to 3 and 6 to 9, the actuator 16 comprises: a first actuator 71 for moving the first holder 13 about the X-axis in relation to the second holder 14; and a second actuator 72 for moving the second holder 14 about the Y-axis in relation to the base 15; and a FPC board 73 for driving the first and  second actuators  71, 72.
The first actuator 71 includes: the first magnet 81; a first coil 82 which is located on the FPC board 73 and generates magnetic force to the first magnet 81; the first attracting yoke 83 attached to the first holder inclining wall 42 of the first holder 13; and a first hall effect element 84 disposed on the FPC board 73.
The first magnet 81 is a rectangular plate extending in parallel to the reflecting plane 12a, and is disposed in the first magnet receiving recess 52A of the second holder 14. The first magnet 81 includes two first  magnetic portions  81A, 81B extending in the lateral direction and arranged in forward-rearward direction in relation to each other. The magnetic pole of a plane facing the reflecting plane 12A of one of two first  magnetic portions  81A, 81B is different from that of the other of two first  magnetic portions  81A, 81B.
The first coil 82 is disposed on the rear face of the first holder inclining wall 42.
The first attracting yoke 83 is received in the first yoke receiving recess 42A.
The first hall effect element 84 is disposed in the central portion of the first coil 82.
Thereby, the first coil 82 and the first hall effect element 84 are disposed between the first holder inclining wall 42 of the first holder 13 and the fist magnet 81. In addition, the first magnet 81, the first coil 82 and the first attracting yoke 83 are disposed near the center of rotating about the X-axis of the reflecting plane 12.
The second actuator 72 includes: the second magnet 91; a second coil 92 which is located on the FPC board 73 and generates magnetic force to the second magnet 91; the second attracting yoke 93 attached to the rear wall 62 of the base 15; and a second hall effect element 94 disposed on the FPC board 73.
The second magnet 91 is a rectangular plate extending in the upward- downward direction and the lateral direction, and is disposed in the second magnet receiving recess 52B of the second holder 14. The second magnet 91 includes two pairs of second magnetic portions 91A to 91D extending in the upward-downward direction and arranged in the lateral direction in relation to each other. The magnetic pole of a plane facing forward of one of four second magnetic portions 91A to 91D is different from that of other of four second magnetic portions 91A to 91D which is adjacent to the one of four second magnetic portions 91A to 91D.
The second coil 92 is disposed on the front face side of the rear wall 62 of the base 15, and one of the pair of second coils 92 faces one pair of second  magnetic portions  91A, 91B of the second magnet 91 and the other pair of the second  magnetic portions  91C, 91D face the other of the pair of second coils 92.
The second hall effect element 94 is disposed between the pair of the second coils 92.
Thereby, the second coils 92 and the second hall effect element 94 are disposed between the rear wall 62 of the second holder 14 and the second magnet 91.
An external output terminal 73A of the FPC board 73 is connected to a control (not shown) of the actuator device 1 for a camera.
The actuator device 1 for a camera, which has the above configuration, configures a camera module together with a lens module to which light outgoing from the outgoing plane 12C of the reflecting member 12 enters. The specific configuration of the lens module is not described in the specification.
Next, the operation of the actuator device 1 for a camera will be explained.
First, when the actuator device 1 for a camera vibrates, a vibration sensor which is separately provided, detects the vibration.
The above controller connected to the actuator 16 determines the current amount for the first and  second coils  82, 92 based on the detected result, and applies the current with the determined current amount to at least one of the first and  second coils  82, 92.
When applying the current to the first coil 82, the first coil 82 generates magnetic field in accordance with the current direction. In accordance with the magnetic field generated by the first coil 82 and the magnetic field of the first magnet 81, the first holder 13 holding the reflecting member 12 rotates about the X-axis in relation to the second holder 14. The first hall effect element 84 detects the rotational amount of the first holder 13 in relation to the second holder 14.
In this regard, the first arc guided faces 41C of the first holder 13 are guided along the first arc guiding faces 51A of the second holder 14 such that the first holder 13 rotates about the X-axis in relation to the second holder 14. Since the first arc guided faces 41C are formed with the first arc grooves 41D and the first arc guiding faces 51A are formed with the second arc grooves 51B, and the first bearings 53 are  disposed between the first arc grooves 41D and the second arc grooves 51B, respectively, the movement direction of the first holder 13 in relation to the second holder 14 is limited to the extending direction of the first and  second arc grooves  41D, 51B, in other words, in a peripheral direction about the X-axis. In addition, since three first bearings 53 are disposed between the first arc guided faces 41C and the first arc guiding faces 51A, respectively, and three-point suspension forms a curved plane extending about the X-axis, supporting the first arc guided facets 41C of the first holder 13 by the fist arc guiding faces 51A of the second holder 14 and rotating the first holder 13 in relation to the second holder 14 are stable, and the change in the posture of the first holder 13 is reduced.
In addition, since the first magnet 81 and the first coil 82 are disposed in substantially parallel to the reflecting plane 12A of the reflecting member 12 near the rotational enter about the X-axis of the reflecting member 12, even when the reflecting member 12 and thus the first holder 13 rotates about the X-axis, the change in the distance between the first magnet 81 and the first coil 82 is small. Thus, the change in the thrust force of the first holder 13 by the magnetic field generated by the first coil 82 is reduced. Also, as mentioned above, the matter that the first bearings 53 are disposed between the first arc guided faces 41C and the first arc guiding faces 51A, respectively, and the first bearings 53 can reduce the friction between the first arc guided faces 41C and the first arc guiding faces 51A reduces the change in the thrust force of the first holder 13 by the magnetic field generated by the first coil 82.
When the above controller stops applying the current to the first coil 82, the first attracting yoke 83 is attracted by the fist magnet 81, and the first holder 13 rotates in relation to the second holder 14 to move back to a rest position in relation to the second holder 14.
In this way, the first holder 13 rotates about the X-axis in relation to the second holder 14.
In the same way, when applying the current to the second coils 92, the second coils 92 generate magnetic field in accordance with the current direction. In accordance with the magnetic field generated by the second coils 92 and the magnetic field of the second magnet 91, the second holder 14 rotates about the Y-axis in relation to the base 15. The second hall effect element 94 detects the rotational amount of the second holder 14 in relation to the base 15.
In this regard, the second arc guided faces 51D and the third arc guided face 52D of the second holder 14 are guided along the second arc guiding faces 61B and the third arc guiding face 62B such that the second holder 14 rotates about the Y-axis in relation to the base 15. Since the second and third arc guided faces 51d, 52D are formed with the third and  fourth arc grooves  51E, 52E and the second and third arc guiding faces 61B, 62B are formed with the fifth and  sixth arc grooves  61C, 62C, and  the second bearings 63 are disposed between the third and  fourth arc grooves  51E, 52E and the fifth and  sixth arc grooves  61C, 62C, respectively, the movement direction of the second holder 14 in relation to the base 15 is limited to the extending direction of the third to  sixth arc grooves  51E, 52E, 61C, 62C, in other words, in a peripheral direction about the Y-axis. In addition, since three second bearings 63 are disposed between the second and third arc guided faces 51D, 52D and the second and the third arc guiding faces 61B, 62B, respectively, and three-point suspension forms a curved plane extending about the Y-axis, supporting the second and third arc guided  facets  51D, 52D of the second holder 14 by the second and third arc guiding faces 61B, 62B of the base 15 and rotating the second holder 14 in relation to the base 15 are stable, and the change in the posture of the second holder 14 is reduced.
In addition, since the second magnet 91 and the second coils 92 are disposed in substantially parallel to the XY plane, even when the second holder 14 rotates about the Y-axis in relation to the base 15, the change in the distance between the second magnet 91 and the second coils 92 is small. Thus, the change in the thrust force of the second holder 14 by the magnetic field generated by the second coils 92 are reduced. Also, as mentioned above, the matter that the second bearings 63 are disposed between the second and third arc guided faces 51D, 52D and the second and third  arc guiding facets  61B, 62B, respectively, and the second bearings 63 can reduce the friction between the second and third arc guided faces 51D, 52D and the second and third  arc guiding facets  61B, 62B reduces the change in the thrust force of the second holder 14 by the magnetic field generated by the second coils 92.
When the above controller stops applying the current to the second coils 92, the second attracting yoke 93 is attracted by the second magnet 91, and the second holder 14 rotates in relation to the base 15 to move back to a rest position in relation to the base 15.
In this way, the second holder 14 rotates about the Y-axis in relation to the base 15.
In the manner described above, the actuator device 1 for a camera is operated by combining the movement about the X-axis and the movement about the Y-axis. Since the first and  second actuators  71, 72, which are distinctly provided, operate the rotation about the X-axis and the rotation about the Y-axis of the reflecting member 12, the mutual thrust interference and the change in the thrust force are inhibited. In addition, since regarding the first actuator 71, the first magnet 81 is provided on the second holder 14 and the first coil 82 and the first attracting yoke 83 are provided on the first holder 13, and regarding the second actuator 72, the second magnet 91 is provided on the second holder 14 and the second coils 92 and the second attracting yoke 93 are provided on the base 15, the magnetic interference between the first actuator 71 and the second actuator 72 are inhibited, and the operation of the actuator  device 1 for a camera is stable.
As described above, in the actuator device 1 for a camera according to the embodiment and the camera module comprising the actuator device 1, the portions (the first arc guiding faces 51A) of the second holder 14 which support the first holder 13, and the portions (the bottom wall 61) of the base 15 which supports the second holder 14 are located behind the reflecting member 12, and the first and  second actuators  71, 72 are located behind the reflecting member 12 to avoid the first and  second holders  13, 14 and the first and  second actuators  71, 72 from being arranged laterally from the reflecting member 12. Thus, the size of the actuator device 1 for a camera in the lateral direction ca be reduced, and thus the actuator device 1 for a camera and the camera module can be made compact.
In addition, arranging the first actuator 71 near the first holder 13 which is driven by the first actuator 71 makes it possible to effectively utilize a space behind the first holder 13 for arranging the first actuator 71. In the same vein, arranging the second actuator 72 near the second holder 14 which is driven by the second actuator 72 makes it possible to effectively utilize a space behind the second holder 14 for arranging the second actuator 72. Therefore, the actuator device 1 for a camera can be made more compact.
Regarding the above matters, the first arc guided faces 41C and the first arc guiding faces 51A guide the rotational movement of the first holder 13 about the X-axis in relation to the second holder 14, and thus the rotational movement of the first holder 13 about the X-axis becomes stable. In this regard, since the first arc guiding faces 51A of the second holder 14 support the first arc guided faces 41C of the first holder 13, the change in the rotational center of the first holder 14 due to the weight of the reflecting member 12 and the first holder 13 can be inhibited. In addition, by changing the shapes of the first arc guided faces 41C and the first arc guiding faces 51A can adjust the rotational center of the first holder 13 in relation to the second holder 14. Moreover, since the first bearings 53 reduce friction, the movement of the first arc guided faces 41C on the first guiding faces 51 becomes more stable. Further, by changing the size of the first bearings 53, any possible misalignment of the rotational center of the X-axis, which can occur when manufacturing the first arc guiding faces 41C and the first arc guided faces 51A, for example, can be eliminated, and the gap between the first magnet 81 and the first coil 82 can be adjusted so as to stabilize the thrust force. In addition, since the movement direction of the first arc guided faces 41C in relation to the first guiding faces 51A is limited to the direction about the X-axis by means of the first bearings 53 and the first and  second arc grooves  41D and 51B, the rotation of the first holder 13 about the X-axis in relation to the second holder 14 becomes more stable.
In the same vein, the second and third arc guided faces 51D, 52D and the  second and third arc guiding faces 61B, 62B guide the rotational movement of the second holder 14 about the Y-axis in relation to the base 15, and thus the rotational movement of the second holder 14 about the Y-axis becomes stable. In this regard, since the second and third arc guiding faces 61B, 62B guide the second and third arc guided faces 51D, 52D, the change in the rotational center of the second holder 14 can be inhibited. In addition, by changing the shapes of the second and third arc guided faces 51D, 52D and the second and third arc guiding faces 61B, 62B can adjust the rotational center of the second holder 14 in relation to the base 15. Moreover since the second bearings 63 reduce friction, the movement of the second and third arc guided faces 51D, 52D on the second and third arc guiding faces 61B, 62B becomes more stable. Further, by changing the size of the second bearings 63, any possible misalignment of the rotational center of the Y-axis, which can occur when manufacturing the second and third arc guided faces 51D, 52D and the second and third arc guiding faces 61B, 62B, for example, can be eliminated, and the gap between the second magnet 91 and the second coils 92 can be adjusted so as to stabilize the thrust force. In addition, since the movement direction of the second and third arc guided faces 51D, 52D in relation to the second and third arc guiding faces 61B, 62B is limited to the direction about the Y-axis by means of the second bearings 63 and third to  sixth arc grooves  51E, 52E, 61C, 62C, the rotation of the second holder 14 abut the Y-axis in relation to the base 15 becomes more stable.
In addition, by applying current to the first coil 82 to generate magnetic field, the first holder 13 holding the reflecting member 12 is rotated about the X-axis in relation to the second holder 14. In addition, since the first attracting yoke 83 is provided on the first holder 13, the first holder 13 is aligned in relation to the second holder 14 when the first coil 83 is not applied with current. In the same vein, by applying current to the second coils 92 to generate magnetic field, the second holder 14 is rotated about the Y-axis in relation to the base 15. In addition, the second attracting yoke 93 is provided on the second holder 14, the second holder 14 is aligned with the base 15 when the second coils 92 are not applied with current.
Moreover, since the swing span of the reflecting member 12 and the first holder 13 about the first axis can be limited when rotating the first holder 13 about the X-axis. Thereby, the size of the actuator device 1 for a camera can be reduced, and thus the size of the camera module can be reduced.
The inventions of the present application are not limited to the above described embodiment, and various modifications to the above described embodiments may be made without departing from the concept of the inventions of the present application.
For example, unless the reflecting member has the reflecting plane, the reflecting member can be made by other member such as a mirror other than a prism.
Unless the first actuator is disposed behind the reflecting plane of the reflecting member, the first actuator can be disposed on other position other than a position between the reflecting member and the second holder. In the same vein, unless the second actuator is disposed behind the reflecting plane of the reflecting member, the second actuator can be disposed on other position other than a position between the second holder and the base.
Unless the first holder is disposed behind the reflecting plane of the reflecting member, the first holder can be disposed on other position. In addition, although the first holder is configured to rotate about the X-axis by guiding the arc guided faces formed on the first holder by means of the arc guiding faces formed on the second holder, the first holder can rotate about the X-axis by means of other configuration such as leaf springs. In the same vein, although unless the second holder is disposed behind the reflecting plane of the reflecting member, the second holder can be disposed on other position. In addition, although the second holder is configured to rotate about the Y-axis by guiding the arc guided faces formed on the second holder by means of the arc guiding faces formed on the base, the second holder can rotate about the Y-axis by means of other configuration such as leaf springs.
The cross-sectional shapes of the arc grooves are not limited to V-shape or U-shape, and can has other shapes. In addition, it is possible for arc grooves not to be formed on the arc guided faces and the arc guiding faces. Moreover, although the bearings are guided by the arc grooves, it is possible for bearings not to be provided on the arc grooves. For example, other configuration can be used for guiding the arc guided faces in relation to the arc guiding faces, by providing guiding protrusion on one of the arc guided face and the arc guiding face, which protrudes toward the other of the arc guided face and the arc guiding face, and providing a guiding groove on the other of the arc guided face and the arc guiding face, which receives the guiding protrusion to guide the rotation about the axis.
The configurations of the first and second actuators are not limited to the configurations comprising the coil, the magnet and the attracting yoke. The arrangement of the coil, the magnet and the attracting yoke are not limited to the arrangement in the illustrated embodiment, and the arrangement can be changed appropriately. For example, regarding the first actuator, the first magnet can be provided on the first holder and the first coil and the first attracting yoke can be provided on the second actuator.
Although the reflecting member is configured to move about the X-axis and Y-axis in relation to the base by means of the first and second holders, unless the reflecting member is configured to move about two different axes, it is possible for the reflecting member not to be configured to move about two axes which are perpendicular to each other.
In addition, without departing from the concept of the inventions of the present application, it is possible to appropriately replace the components in the above embodiment with well-known components, and it is possible to appropriately combine the above variations.
Numeral references
1: Actuator device for a camera
12: Reflecting member
12A: Reflecting surface
13: First holder
14: Second holder
41C: First arc guided face
41D: First arc groove (first guiding groove)
51A: First arc guiding face
51B: Second arc groove (first guiding groove)
51D: Second arc guided face
51E: Third arc groove (second guiding groove)
52D: Third arc guided face
52E: Fourth arc groove (second guiding groove)
53: First bearing
61B: Second arc guiding face
61C: Fifth arc groove (Second guiding groove)
62B: Third arc guiding face
62C: Sixth arc groove (second guiding groove)
63: Second bearing
71: First actuator
72: Second actuator
81: First magnet
82: First coil
83: First attracting yoke
91: Second magnet
92: Second coil
93: Second attracting yoke

Claims (13)

  1. An actuator device for a camera, comprising:
    a reflecting member for deflecting incident light toward a different direction on a reflecting plane;
    a first holder for holding the reflecting member;
    a second holder for supporting the first holder so as to move the first holder about a first axis;
    a base for supporting the second holder so as to move the second holder about a second axis unparallel to the first axis;
    a first actuator for moving the first holder about the first axis in relation to the second holder; and
    a second actuator for moving the second holder about the second axis in relation to the base,
    wherein a portion of the second holder which supports the first holder and a portion of the base which supports the second holder, and the first and second actuators are located behind the reflecting plane.
  2. An actuator device for a camera in claim 1, wherein the first actuator is provided between the reflecting member and the second holder.
  3. An actuator device for a camera in claim 1 or 2, wherein the second actuator is provided between the first holder and the base.
  4. An actuator device for a camera in any one of the preceding claims, wherein
    the first holder is formed with a first arc guided face for rotating the first holder about the first axis in relation to the second holder, and wherein
    the second holder is formed with a first arc guiding face for guiding the first arc guided face.
  5. An actuator device for a camera in claim 4, wherein a first bearing is disposed between the first arc guided face and the first arc guiding face.
  6. An actuator device for a camera in claim 5, wherein at least one of the first arc guided face and the first arc guiding face is formed with a first guiding groove extending about the first axis and limiting the movement of the first bearing to the movement about the first axis.
  7. An actuator device for a camera in any one of the preceding claims, wherein
    the second holder is formed with a second arc guided face for rotating the second holder about the second axis in relation to the base, and wherein
    the base is formed with a second arc guiding face for guiding the second arc guided face.
  8. An actuator device for a camera in claim 7, wherein a second bearing is disposed between the second arc guided face and the second arc guiding face.
  9. An actuator device for a camera in claim 8, wherein at least one of the second arc guided face and the second arc guiding face are formed with a second guiding groove extending about the second axis and limiting the movement of the second bearing to the movement about the second axis.
  10. An actuator device for a camera in any one of the preceding claims, wherein
    the first actuator comprises: a first coil, a first magnet and a first attracting yoke, wherein
    one of: (i) the first coil and the first attracting yoke; and (ii) the first magnet is provided on the first holder, and wherein
    the other of: (i) the first coil and the first attracting yoke; and (ii) the first magnet is provided on the second holder.
  11. An actuator device for a camera in any one of the preceding claims, wherein
    the second actuator comprises: a second coil, a second magnet and a second attracting yoke, wherein
    one of: (i) the second coil and the second attracting yoke; and (ii) the second magnet is provided on the second holder, and wherein
    the other of: the second coil and the second attracting yoke; and the second magnet is provided on the base.
  12. An actuator device for a camera in any one of the preceding claims, wherein the first axis extends in parallel to the reflecting face.
  13. A camera module comprising the actuator device for a camera in any one of the preceding claims.
PCT/CN2022/073871 2022-01-25 2022-01-25 Actuator device for a camera and camera module comprising such actuator device WO2023141779A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108572430A (en) * 2017-03-08 2018-09-25 三星电机株式会社 Reflecting module for optical image stabilization and the camera model including it
CN109218576A (en) * 2017-07-03 2019-01-15 三星电机株式会社 Camera model and portable electronic device including camera model
US20200057313A1 (en) * 2017-12-14 2020-02-20 Lg Electronics Inc. Prism apparatus, and camera apparatus including the same
CN211698548U (en) * 2019-05-16 2020-10-16 三星电机株式会社 Folding optical reflection module
CN112104799A (en) * 2019-06-18 2020-12-18 三星电机株式会社 Reflection module for optical image stabilization and camera module including the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108572430A (en) * 2017-03-08 2018-09-25 三星电机株式会社 Reflecting module for optical image stabilization and the camera model including it
CN109218576A (en) * 2017-07-03 2019-01-15 三星电机株式会社 Camera model and portable electronic device including camera model
US20200057313A1 (en) * 2017-12-14 2020-02-20 Lg Electronics Inc. Prism apparatus, and camera apparatus including the same
CN211698548U (en) * 2019-05-16 2020-10-16 三星电机株式会社 Folding optical reflection module
CN112104799A (en) * 2019-06-18 2020-12-18 三星电机株式会社 Reflection module for optical image stabilization and camera module including the same

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