WO2024048012A1 - Dispositif d'entraînement d'élément optique, module de caméra et dispositif équipé d'une caméra - Google Patents

Dispositif d'entraînement d'élément optique, module de caméra et dispositif équipé d'une caméra Download PDF

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Publication number
WO2024048012A1
WO2024048012A1 PCT/JP2023/022285 JP2023022285W WO2024048012A1 WO 2024048012 A1 WO2024048012 A1 WO 2024048012A1 JP 2023022285 W JP2023022285 W JP 2023022285W WO 2024048012 A1 WO2024048012 A1 WO 2024048012A1
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WIPO (PCT)
Prior art keywords
section
ois
axis direction
power transmission
movable
Prior art date
Application number
PCT/JP2023/022285
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English (en)
Japanese (ja)
Inventor
智之 村上
Original Assignee
ミツミ電機株式会社
智之 村上
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by ミツミ電機株式会社, 智之 村上 filed Critical ミツミ電機株式会社
Publication of WO2024048012A1 publication Critical patent/WO2024048012A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices

Definitions

  • the present invention relates to an optical element driving device, a camera module, and a camera mounting device.
  • AF function autofocus function
  • OIS function optical image stabilization
  • An optical element drive device having an AF function and an OIS function includes an autofocus drive unit (hereinafter referred to as "AF drive unit”) for moving the lens part in the optical axis direction, and a plane perpendicular to the optical axis direction to move the lens part. and an image stabilization drive unit (hereinafter referred to as "OIS drive unit”) for moving the camera within the camera.
  • AF drive unit autofocus drive unit
  • OIS drive unit image stabilization drive unit
  • the ultrasonic motor type drive unit includes a resonator, which is an active element.
  • a resonant part is arranged in an active side member consisting of either a movable part or a fixed part
  • a resonance part is arranged in an active side member consisting of either a movable part or a fixed part, and the resonance part is transmitted from the other of the movable part or the fixed part via a power transmission part which is a passive element. Power is transmitted to the passive side member.
  • the resonance part and the power transmission part are in contact with each other in a biased state and slide against each other when driven.
  • the "active member” is a member on which the drive unit is arranged
  • the “passive member” is a member connected to the drive unit via the power transmission section.
  • the active element, passive element, movable part, fixed part, etc. are designed so that the moving direction of the movable part and the power transmission direction match.
  • a deviation may occur between the mounting angle of the passive element to the active element and the mounting angle of the movable part to the fixed part. This deviation also affects the contact state between the active element and the passive element, making it difficult for both members to slide, which may result in unstable generation of power transmitted to the movable part.
  • An object of the present invention is to provide a highly reliable optical element drive device, camera module, and camera mounting device that can stabilize the movement operation of a movable part.
  • the optical element driving device includes: A fixed part, a movable part that includes an optical element and is movable with respect to the fixed part via a rolling element; an ultrasonic motor-type drive unit that is disposed on an active side member consisting of either the fixed part or the movable part and moves the movable part with respect to the fixed part; a power transmission section that connects the drive section and a passive side member consisting of the other of the fixed section and the movable section, and transmits the power of the drive section to the passive side member; Equipped with The driving section has a resonating section having a pair of vibrating arms, The power transmission section has a guide section that guides the rolling element, and is held in a biased state by the pair of arms.
  • the camera module includes: The above optical element driving device, an optical element attached to the movable part; An imaging unit that captures a subject image formed by the optical element.
  • the camera-mounted device includes: A camera-equipped device that is an information device or a transportation device, The above camera module, An image processing unit that processes image information obtained by the camera module.
  • a highly reliable optical element drive device, camera module, and camera mounting device are provided that can stabilize power transmission from an active element to a passive element and improve drive performance.
  • FIG. 1A and FIG. 1B are diagrams showing a smartphone equipped with a camera module according to an embodiment of the present invention.
  • FIG. 2 is an external perspective view of the camera module.
  • FIG. 3 is an external perspective view of the optical element driving device.
  • FIG. 4 is an external perspective view of the optical element driving device.
  • FIG. 5 is an exploded perspective view of the optical element driving device.
  • FIG. 6 is an exploded perspective view of the optical element driving device.
  • 7A and 7B are plan views of the second stage.
  • FIG. 8 is an exploded perspective view of the AF unit.
  • FIG. 9 is an exploded perspective view of the AF unit.
  • 10A and 10B are enlarged views of the OIS drive unit.
  • 11A and 11B are schematic diagrams of the power transmission mechanism in the OIS drive unit.
  • FIG. 12 is an enlarged view of the AF drive unit.
  • 13A and 13B are diagrams showing an automobile as a camera mounting device equipped with an in-vehicle camera module.
  • FIG. 1A and 1B are diagrams showing a smartphone M (an example of a camera-equipped device) equipped with a camera module A according to an embodiment of the present invention.
  • FIG. 1A is a front view of the smartphone M
  • FIG. 1B is a rear view of the smartphone M.
  • the smartphone M has a dual camera consisting of two rear cameras OC1 and OC2.
  • camera module A is applied to rear cameras OC1 and OC2.
  • Camera module A is equipped with an AF function and an OIS function, and not only automatically focuses when photographing a subject, but also optically corrects shake (vibration) that occurs during photographing to photograph images without image blur. be able to.
  • FIG. 2 is an external perspective view of the camera module A.
  • 3 and 4 are external perspective views of the optical element driving device 1 according to the embodiment.
  • FIG. 4 shows a state in which FIG. 3 is rotated by 90 degrees around the Z axis.
  • the embodiment will be described using an orthogonal coordinate system (X, Y, Z).
  • the figures to be described later are also shown using a common orthogonal coordinate system (X, Y, Z).
  • the X-axis direction is the up-down direction (or the left-right direction)
  • the Y-axis direction is the left-right direction (or the up-down direction)
  • the Z-axis direction is the front-back direction. It will be installed as follows. That is, the Z-axis direction is the optical axis direction, the upper side (+Z side) in the figure is the light receiving side in the optical axis direction, and the lower side ( ⁇ Z side) is the imaging side in the optical axis direction.
  • optical axis orthogonal directions X-axis direction and the Y-axis direction orthogonal to the Z-axis
  • XY plane optical axis orthogonal plane
  • the camera module A includes an optical element drive device 1 that realizes an AF function and an OIS function, a lens section 2 in which a lens is housed in a cylindrical lens barrel, and a lens section 2. It includes an imaging unit 3 and the like that captures the captured image of the subject. That is, the optical element driving device 1 is a lens driving device that drives the lens section 2 as an optical element.
  • the imaging unit 3 is arranged on the imaging side of the optical element driving device 1 in the optical axis direction.
  • the imaging unit 3 includes, for example, an image sensor board 301, an image sensor 302 mounted on the image sensor board 301, and a control unit 303.
  • the image sensor 302 is configured by, for example, a CCD (charge-coupled device) type image sensor, a CMOS (complementary metal oxide semiconductor) type image sensor, etc., and captures a subject image formed by the lens unit 2.
  • the control unit 303 includes, for example, a control IC, and controls the drive of the optical element drive device 1 .
  • the optical element driving device 1 is mounted on the image sensor substrate 301 and mechanically and electrically connected to it. Note that the control unit 303 may be provided on the image sensor board 301, or may be provided on a camera-equipped device (in the embodiment, the smartphone M) on which the camera module A is mounted.
  • the optical element driving device 1 is covered with a cover 24 on the outside.
  • the cover 24 is a rectangular lidded square cylinder when viewed from above in the optical axis direction. In the embodiment, the cover 24 has a square shape in plan view.
  • the cover 24 has a substantially circular opening 241 on the light receiving side surface (upper surface) in the optical axis direction.
  • the lens portion 2 faces the outside through the opening 241 of the cover 24.
  • the lens portion 2 may be arranged so as to protrude from the opening surface of the cover 24 toward the light receiving side.
  • the cover 24 is fixed to the base 21 (see FIG. 5) of the OIS fixing section 20 of the optical element driving device 1, for example, by adhesive.
  • FIG. 5 and 6 are exploded perspective views of the optical element driving device 1 according to the embodiment.
  • 7A and 7B are plan views of the second stage 13.
  • 8 and 9 are exploded perspective views of the AF unit 10A. 6 and 9 respectively show the state in which FIG. 5 and FIG. 8 are rotated by 90 degrees around the Z axis.
  • the optical element driving device 1 includes an OIS movable section 10, an OIS fixed section 20, an X-axis direction drive unit 50X, a Y-axis direction drive unit 50Y, and an OIS support. It includes sections 41 and 42.
  • the OIS movable part 10 is a part that moves in a plane perpendicular to the optical axis during shake correction.
  • the OIS movable section 10 includes an AF unit 10A and a second stage 13.
  • the OIS fixed part 20 is a part to which the OIS movable part 10 is connected via the OIS support part 41.
  • the OIS fixing part 20 includes a base 21.
  • the OIS movable part 10 is arranged apart from the OIS fixed part 20 in the optical axis direction, and is connected to the OIS fixed part 20 via the OIS support parts 41 and 42.
  • the OIS movable section 10 and the OIS fixed section 20 are urged toward each other by an OIS urging member 30.
  • the OIS biasing members 30 are arranged, for example, at the four corners of the optical element driving device 1 in a plan view.
  • the OIS biasing member 30 is composed of, for example, a tension coil spring, and connects the OIS movable part 10 and the OIS fixed part 20.
  • one end of the OIS biasing member 30 is connected to wiring (not shown) of the base 21, and the other end is connected to the terminal fitting 162 of the first stage 12.
  • the OIS biasing member 30 functions as a power supply line to the AF drive unit 70 and the Y-axis direction drive unit 50Y.
  • the OIS biasing member 30 receives a tensile load when the OIS movable part 10 and the OIS fixed part 20 are connected, and acts so that the OIS movable part 10 and the OIS fixed part 20 approach each other. Thereby, the OIS movable part 10 is held movably within the XY plane while being biased in the optical axis direction (pressed against the base 21). Therefore, the OIS movable part 10 can be held in a stable state without rattling.
  • a damper material (not shown) that suppresses vibration may be disposed on the OIS biasing member 30.
  • the OIS support section 41 supports the second stage 13, which functions as the OIS movable section 10, with respect to the base 21, which functions as the OIS fixed section 20, while being spaced apart in the optical axis direction.
  • the OIS support section 41 is composed of four balls that are rotatably interposed between the base 21 and the second stage 13. Note that the number of balls forming the OIS support section 41 can be changed as appropriate.
  • the OIS support section 42 supports the first stage 12, which functions as the OIS movable section 10, with respect to the second stage 13, which functions as the OIS fixed section 20, while being spaced apart in the optical axis direction.
  • the OIS support section 42 is composed of four balls that are rotatably interposed between the second stage 13 and the first stage 12. Note that the number of balls forming the OIS support section 42 can be changed as appropriate.
  • the entire OIS movable section 10 including the AF unit 10A moves as a movable body.
  • the AF unit 10A moves as a movable body. That is, regarding movement in the Y-axis direction, the second stage 13 and the base 21 constitute the OIS fixing part 20.
  • the base 21 is formed of, for example, polyarylate (PAR), a PAR alloy (for example, PAR/PC) that is a mixture of a plurality of resin materials containing PAR, or a molding material made of a liquid crystal polymer.
  • the base 21 is a rectangular member in plan view, and has a circular opening 211 in the center.
  • the base 21 has an OIS motor fixing part 212 in which the X-axis direction drive unit 50X is placed.
  • the OIS motor fixing part 212 is formed, for example, on one side of the outer peripheral edge of the base 21 along the X-axis so as to protrude toward the light receiving side in the optical axis direction, and has a shape capable of holding the X-axis direction drive unit 50X. There is.
  • the base 21 functions as an active member regarding the movement of the OIS movable section 10 in the X-axis direction.
  • the base 21 supports the second stage 13 of the OIS movable section 10 via the OIS support section 41 so as to be movable in the X-axis direction.
  • the base 21 has an OIS ball holding part 214 on the light receiving side surface in the optical axis direction, on which the OIS supporting part 41 is arranged.
  • the OIS ball holding portion 214 is, for example, a groove having a rectangular shape extending in the X-axis direction in plan view.
  • the OIS ball holding portion 214 is formed to have a substantially V-shaped (tapered) cross-sectional shape so that the groove width becomes narrower toward the bottom side.
  • the OIS ball holding section 214 is provided near the four corners of the base 21, and the OIS movable section 10 (second stage 13) is is supported by 4 points.
  • a terminal fitting 22 and wiring (not shown) connected to the terminal fitting 22 are arranged on the base 21, for example, by insert molding.
  • the terminal fitting 22 is exposed from the base 21 and is electrically connected to, for example, the image sensor board 301. Further, the wiring is electrically connected to the OIS biasing member 30. Power is supplied to the AF drive unit 70 and the Y-axis direction drive unit 50Y via the OIS biasing member 30.
  • a sensor board may be placed on the base 21 and the wiring of the sensor board and the terminal fittings 22 may be electrically connected.
  • a position detection sensor may be arranged on the base 21 to detect the position of the OIS movable part 10 in the X-axis direction and the Y-axis direction, and the position of the AF movable part 11 in the Z-axis direction.
  • a Hall element or a magnetic sensor such as a TMR (Tunnel Magneto Resistance) sensor can be applied to the position detection sensor.
  • magnets are arranged in the OIS movable section 10 (for example, the first stage 12) and the AF movable section 11 so as to face the magnetic sensor.
  • the position of the OIS movable section 10 in the X-axis direction and the Y-axis direction, and the position of the AF movable section 11 in the Z-axis direction may be detected by an optical sensor such as a photoreflector.
  • the second stage 13 is a member that has a substantially rectangular shape in plan view from the optical axis direction, and is formed of, for example, a liquid crystal polymer.
  • the second stage 13 has an opening 131 in a portion corresponding to the AF movable section 11.
  • a portion 132 corresponding to the X-axis drive unit 50X is recessed inward in the radial direction so that the X-axis drive unit 50X can be placed without protruding outward in the radial direction. Furthermore, in the second stage 13, a portion 133 corresponding to the Y-axis direction drive unit 50Y is similarly formed to be recessed inward in the radial direction (hereinafter referred to as "OIS motor fixing portions 132, 133").
  • An X-axis direction power transmission section 60X is fixed to the OIS motor fixing section 132.
  • a Y-axis direction power transmission section 60Y is fixed to the OIS motor fixing section 133.
  • the second stage 13 functions as a passive member with respect to the movement of the OIS movable section 10 in the X-axis direction and the Y-axis direction.
  • the second stage 13 supports the first stage 12 of the AF unit 10A via the OIS support part 42 so as to be movable in the Y-axis direction.
  • the second stage 13 has an OIS ball holder 134 on the light-receiving side surface (upper surface) in the optical axis direction, on which the OIS support section 42 is arranged.
  • the OIS ball holding portion 134 is, for example, a groove having a rectangular shape extending in the Y-axis direction in plan view.
  • the OIS ball holding portion 134 has a substantially V-shaped (tapered) cross-sectional shape so that the groove width becomes narrower toward the bottom side.
  • the OIS ball holding section 134 is provided near the four corners of the second stage 13, and the four OIS supporting sections 42 arranged on the OIS ball holding section 134 support the AF unit 10A (the first stage 12 ) is supported by 4 points.
  • one of the four OIS ball holding parts 134 specifically, the OIS ball holding part 134A provided near the Y-axis direction drive unit 50Y, is provided in the Y-axis direction power transmission part 60Y. (See Figure 7A).
  • the OIS ball holding section 134 provided on the light receiving side surface in the optical axis direction of the X-axis direction power transmission section 60X may be provided on the second stage 13.
  • a ball holding section 135 that holds the OIS support section 41 is formed on the image formation side surface (lower surface) of the second stage 13 in the optical axis direction at a position facing the OIS ball holding section 214 of the base 21 in the Z-axis direction. has been done.
  • the OIS ball holding section 135 provided on the surface of the Y-axis direction power transmission section 60Y on the imaging side in the optical axis direction may be provided on the second stage 13.
  • the OIS support section 41 is held between the base 21 and the OIS ball holding sections 214 and 135 of the first stage 12 with multi-point contact. Therefore, the balls forming the OIS support portion 41 stably roll in the X-axis direction.
  • the AF unit 10A includes an AF movable section 11, a first stage 12, an AF drive unit 70, and an AF support section 15.
  • the first stage 12 is a member having a substantially rectangular shape when viewed from above in the optical axis direction, and is formed of, for example, a liquid crystal polymer.
  • the first stage 12 has a substantially circular opening 121 in a portion corresponding to the AF movable section 11 .
  • a portion 122 corresponding to the X-axis direction drive unit 50X is formed to be recessed inward in the radial direction so that the X-axis direction drive unit 50X can be placed without protruding outward in the radial direction. Furthermore, in the first stage 12, a portion 123 corresponding to the Y-axis direction drive unit 50Y is similarly formed to be recessed inward in the radial direction (hereinafter referred to as "OIS motor fixing portions 122, 123").
  • a Y-axis direction drive unit 50Y is fixed to the OIS motor fixing part 123.
  • the first stage 12 functions as an active member regarding the movement of the OIS movable section 10 in the Y-axis direction.
  • the first stage 12 supports the AF movable section 11 via the AF support section 15 so as to be movable in the optical axis direction.
  • the first stage 12 has an AF ball holding part 124 on the inner circumferential surface of the opening 121, in which the AF support part 15 is arranged.
  • the AF ball holding portions 124 are provided at two diagonally located locations among the four corners of the first stage 12 in plan view.
  • the AF ball holding portion 124 extends along the optical axis direction, and has a substantially V-shaped (tapered) cross-sectional shape so that the groove width becomes narrower toward the groove bottom.
  • the OIS ball holding part that holds the OIS support part 42 at a position facing the OIS ball holding part 134 of the second stage 13 in the Z-axis direction. (not shown) is formed.
  • the OIS support part 42 is held between the OIS ball holding parts of the first stage 12 and the second stage 13 with multi-point contact. Therefore, the balls forming the OIS support portion 42 stably roll in the Y-axis direction.
  • the first stage 12 has an AF motor fixing part 125 on the outer peripheral surface of the opening 121, in which the AF drive unit 70 is disposed.
  • the AF motor fixing part 125 is provided at the same diagonal position as the AF ball holding part 124 among the four corners of the first stage 12 in plan view.
  • an AF motor fixing metal fitting (not shown) is attached to the AF motor fixing part 125, and the AF resonance part 71 of the AF drive unit 70 is held by the AF motor fixing metal fitting.
  • the first stage 12 functions as an active member regarding the movement of the AF movable section 11 in the Z-axis direction.
  • a power supply line to the AF drive unit 70 and the Y-axis direction drive unit 50Y is arranged on the first stage 12.
  • four metal plates 161 are physically separated and arranged on the light-receiving side surface of the first stage 12 in the optical axis direction.
  • the four metal plates 161 are respectively connected to terminal fittings 162 exposed from the four corners of the first stage 12.
  • Power is supplied from wiring (not shown) of the base 21 to the AF drive unit 70 and the Y-axis direction drive unit 50Y via the OIS biasing member 30, the terminal fittings 162, and the metal plate 161.
  • the AF movable part 11 is a lens holder that holds the lens part 2 (see FIG. 2), and moves in the optical axis direction during focusing.
  • the AF movable section 11 is arranged radially inwardly and spaced apart from the first stage 12 (AF fixed section), and is supported while being biased by the first stage 12 via the AF support section 15 .
  • the AF movable part 11 is formed of, for example, polyarylate (PAR), a PAR alloy that is a mixture of a plurality of resin materials including PAR, a liquid crystal polymer, or the like.
  • the AF movable section 11 has a cylindrical lens housing section 111.
  • the lens portion 2 is fixed to the inner circumferential surface of the lens housing portion 111 by, for example, adhesive.
  • the AF movable section 11 has an AF motor fixing section 112 on the outer peripheral surface of the lens housing section 111 at a position corresponding to the AF drive unit 70 to which the AF power transmission section 80 is fixed.
  • the AF movable section 11 functions as a passive member regarding movement of the AF movable section 11 in the Z-axis direction.
  • the AF movable section 11 has an AF ball holding section 114 that holds the AF support section 15 at a position corresponding to the AF ball holding section 124 of the first stage 12 on the outer peripheral surface of the lens housing section 111 .
  • an AF power transmission section 80 is provided on the outer peripheral surface of the lens housing section 111 of the AF movable section 11 so as to protrude outward. is formed.
  • the AF support section 15 is held between the first stage 12 and the AF ball holding sections 124 and 114 of the AF movable section 11 with multi-point contact. Therefore, the balls forming the AF support section 15 stably roll in the Z-axis direction.
  • the AF support part 15 supports the AF movable part 11 in a radially spaced state with respect to the first stage 12 (AF fixed part).
  • the AF support section 15 is composed of four balls that are rotatably interposed between the first stage 12 and the AF movable section 11. Note that the number of balls constituting the AF support section 15 can be changed as appropriate.
  • the X-axis direction drive unit 50X and the Y-axis direction drive unit 50Y are ultrasonic motor-type actuators that move the OIS movable section 10 in the X-axis direction and the Y-axis direction.
  • the X-axis direction drive unit 50X is arranged on the base 21, which is an active side member, and is connected to the second stage 13, which is a passive side element, via the X-axis direction power transmission section 60X.
  • the Y-axis direction drive unit 50Y is arranged on the first stage 12, which is an active side member, and is connected to the second stage 13, which is a passive side element, via the Y-axis direction power transmission section 60Y.
  • the X-axis direction drive unit 50X and the X-axis direction power transmission section 60X, and the Y-axis direction drive unit 50Y and the Y-axis direction power transmission section 60Y are arranged along mutually orthogonal sides.
  • the X-axis direction drive unit 50X and the X-axis direction power transmission section 60X are arranged to extend along the X-axis, and move the entire OIS movable section 10 in the X-axis direction.
  • the X-axis direction drive unit 50X is fixed to the OIS motor fixing part 212 of the base 21, and the X-axis direction power transmission part 60X is fixed to the OIS motor fixing part 132 of the second stage 13.
  • the Y-axis direction drive unit 50Y is arranged to extend along the Y-axis, and moves only the AF unit 10A of the OIS movable section 10 in the Y-axis direction.
  • the Y-axis direction drive unit 50Y is fixed to the OIS motor fixing part 123 of the first stage 12, and the Y-axis direction power transmission part 60Y is fixed to the OIS motor fixing part 133 of the second stage 13. .
  • the X-axis direction drive unit 50X and the Y-axis direction drive unit 50Y are collectively referred to as “OIS drive units 50X, 50Y.” Furthermore, the X-axis direction power transmission section 60X and the Y-axis direction power transmission section 60Y are collectively referred to as “OIS power transmission sections 60X, 60Y.”
  • the OIS drive units 50X and 50Y each have an OIS resonance section 51 and an OIS piezoelectric element 52.
  • the OIS piezoelectric element 52 is, for example, a plate-shaped element made of a ceramic material, and generates vibration by applying a high-frequency voltage. Two OIS piezoelectric elements 52 are arranged so as to sandwich the body (not shown) of the OIS resonator 51 .
  • the OIS resonator 51 is formed of a conductive material and resonates in response to the vibration of the OIS piezoelectric element 52.
  • the OIS resonator 51 may be made of a metal having predetermined conductivity, shear strength, hardness, specific gravity, Young's modulus, etc., and is preferably made of stainless steel, for example.
  • the OIS resonator 51 and the OIS piezoelectric element 52 of the X-axis direction drive unit 50X are electrically connected to wiring (not shown) of the base 21.
  • the OIS resonator 51 and the OIS piezoelectric element 52 of the Y-axis direction drive unit 50Y are electrically connected to a metal plate 161 that functions as a power supply line.
  • the OIS resonator 51 includes a substantially rectangular body (not shown) held between the OIS piezoelectric elements 52 and two arms 511 and 512 extending from the upper and lower parts of the body in the X-axis direction or the Y-axis direction. have The two arms 511 and 512 have a substantially symmetrical shape, and their respective free ends abut the OIS power transmission sections 60X and 60Y, resonate with the vibration of the OIS piezoelectric element 52, and deform symmetrically.
  • the two arms 511 and 512 are formed so that the contact surfaces that contact the OIS power transmission sections 60X and 60Y face inward and face each other.
  • the vibration motion of the OIS piezoelectric element 52 is converted into linear motion of the OIS power transmission parts 60X and 60Y. Ru.
  • the OIS resonator 51 has at least two resonant frequencies, and deforms with different behavior for each resonant frequency.
  • the overall shape of the OIS resonant section 51 is set so that it deforms with different behaviors for two resonant frequencies.
  • the different behaviors are a behavior in which the OIS power transmission units 60X and 60Y are moved forward in the X-axis direction or the Y-axis direction, and a behavior in which they are moved backward.
  • the OIS power transmission units 60X and 60Y are fixed to the second stage 13, which is a passive side member, and are movable together with the second stage 13.
  • the OIS power transmission sections 60X and 60Y are held in a biased state by a pair of arms 511 and 512 of the OIS resonance section 51.
  • the OIS power transmission sections 60X and 60Y are made of rigid bodies and are less likely to deform than the arms 511 and 512.
  • the OIS power transmission sections 60X and 60Y are block members made of a ceramic material such as zirconia, for example.
  • the OIS power transmission parts 60X and 60Y may be members in which a coating layer made of a ceramic material is formed on the surface (at least the surface that contacts the OIS resonance part 51) of a block made of a metal material such as stainless steel.
  • the width in the direction in which they are sandwiched by the arms 511 and 512 is larger than the separation width of the tips of the arms 511 and 512 (portions that contact the OIS power transmission sections 60X and 60Y).
  • the OIS power transmission parts 60X and 60Y are fitted between the arms 511 and 512, the arms 511 and 512 are deformed so as to be pushed apart, so that a restoring force is generated in the arms 511 and 512.
  • OIS power transmission sections 60X and 60Y are held in a biased state between arms 511 and 512 by the restoring force generated in arms 511 and 512.
  • the OIS power transmission parts 60X and 60Y are composed of two plate-shaped members and the OIS power transmission parts 60X and 60Y are urged against the arms 511 and 512 using the restoring force generated in the plate-shaped members, the OIS power transmission parts 60X and 60Y are
  • the state of contact between the power transmission units 60X, 60Y and the arms 511, 512 changes as the OIS power transmission units 60X, 60Y move, and there is a possibility that the driving performance may become unstable.
  • the state of contact between the OIS power transmission sections 60X, 60Y and the arms 511, 512 does not change even if the OIS power transmission sections 60X, 60Y move, so stable drive performance is achieved. can be obtained.
  • An OIS ball holding section 135A that holds the OIS support section 41 together with the OIS ball holding section 214 of the base 21 is provided on the surface of the X-axis direction power transmission section 60X on the optical axis direction imaging side (see FIG. 7B). ).
  • An OIS ball holding section 134A that holds the OIS support section 42 together with the OIS ball holding section (not shown) of the first stage 12 is provided on the light receiving side surface of the Y-axis direction power transmission section 60Y in the optical axis direction. (See Figure 7B).
  • the active part is moved so that the moving direction D1 of the movable part (the relative moving direction of the second stage 13 with respect to the base 21 or the first stage 12) matches the power transmission direction D2.
  • Elements OFIS resonance part 51
  • passive elements OFIS power transmission parts 60X, 60Y
  • the power transmission direction D2 is inclined with respect to the moving direction D1 of the movable part, and the OIS resonance part 51 and the OIS power transmission parts 60X and 60Y are difficult to slide. As a result, the generation of power transmitted to the movable part may become unstable (see FIG. 11B).
  • OIS ball holding parts 134A and 135A that guide the rolling of OIS support parts 41 and 42 are formed in OIS power transmission parts 60X and 60Y (see FIG. 11A).
  • the second stage 13 which is a passive side member, one of the four OIS support parts 41 is interposed between the base 21 and the X-axis direction power transmission part 60X, and one of the four OIS support parts 42 is interposed between the base 21 and the X-axis direction power transmission part 60X. One of them is interposed between the first stage 12 and the Y-axis direction power transmission section 60Y.
  • the OIS support parts 41 and 42 roll along the power transmission direction D2, so the moving direction D1 of the movable part and the power transmission direction D2 coincide (see FIG. 10A). Therefore, since the sliding motion between the OIS resonance part 51 and the OIS power transmission parts 60X and 60Y is maintained, the rolling motion of the balls of the OIS support parts 41 and 42 is performed smoothly, and the moving motion of the movable part is stabilized. .
  • the AF drive unit 70 is an ultrasonic motor type actuator that moves the AF movable section 11 in the Z-axis direction. As shown in FIG. 12, the AF drive unit 70 is arranged on the first stage 12, which is an active side member, and is connected to the AF movable section 11, which is a passive element, via the AF power transmission section 80.
  • two AF drive units 70 are arranged between the AF movable section 11 and the first stage 12.
  • the AF drive unit 70 is fixed to the AF motor fixing part 125 of the first stage 12 so that arms 711 and 712 extend in the Z-axis direction.
  • the AF drive unit 70 has an AF resonance section 71 and an AF piezoelectric element 72.
  • the AF piezoelectric element 72 is, for example, a plate-shaped element made of a ceramic material, and generates vibration by applying a high-frequency voltage. Two AF piezoelectric elements 72 are arranged so as to sandwich the body (not shown) of the AF resonator 71 .
  • the AF resonance part 71 is formed of a conductive material and resonates in response to the vibration of the AF piezoelectric element 72.
  • the AF resonator 71 may be made of metal having predetermined conductivity, shear strength, hardness, specific gravity, Young's modulus, etc.
  • stainless steel is suitable.
  • the AF resonator 71 and the AF piezoelectric element 72 are electrically connected to a metal plate 161 that functions as a power supply line.
  • the AF resonator 71 has a substantially rectangular body (not shown) held between the AF piezoelectric elements 72 and two arms 711 and 712 extending from the body in the Z-axis direction.
  • the two arms 711 and 712 have a substantially symmetrical shape, and their respective free ends abut the AF power transmission section 80, resonate with the vibration of the AF piezoelectric element 72, and deform symmetrically.
  • the two arms 711 and 712 are formed so that the surfaces that contact the AF power transmission section 80 face inward and face each other.
  • the vibration motion of the AF piezoelectric element 72 is converted into linear motion of the AF power transmission section 80 .
  • the AF resonance section 71 has at least two resonance frequencies, and deforms with different behavior for each resonance frequency.
  • the overall shape of the AF resonance section 71 is set so that it deforms with different behaviors for two resonance frequencies.
  • the AF power transmission section 80 is fixed to the AF movable section 11 and is movable integrally with the AF movable section 11.
  • the AF power transmission section 80 is held between the arms 711 and 712 of the AF resonance section 71 while being biased.
  • the AF power transmission section 80 is made of a rigid body and is less likely to deform than the arms 711 and 712.
  • the AF power transmission section 80 is, for example, a block member made of a ceramic material such as zirconia.
  • the AF power transmission section 80 may be a member in which a coating layer made of a ceramic material is formed on the surface (at least the surface that contacts the AF resonance section 71) of a block made of a metal material such as stainless steel.
  • the width in the direction sandwiched by the arms 711 and 712 is larger than the separation width of the tips of the arms 711 and 712 (portions that contact the AF power transmission section 80).
  • the AF power transmission section 80 is provided with an AF ball holding section 114 that guides the rolling of the AF support section 15.
  • two AF ball holding sections 114 are provided along the Z-axis direction so as to sandwich the AF power transmission section 60 therebetween. Thereby, the rolling motion of the ball of the AF support section 15 is performed smoothly, and the moving motion of the AF movable section 11 is stabilized.
  • the AF piezoelectric element 72 vibrates, and the AF resonant section 71 deforms in a manner that corresponds to the frequency.
  • the AF power transmission section 80 is slid in the Z-axis direction by the driving force of the AF drive unit 70.
  • the AF movable section 11 moves in the Z-axis direction, and focusing is performed. Since the AF support part 15 is made of a ball, the AF movable part 11 can move smoothly in the Z-axis direction.
  • the height of the optical element drive device 1 can be reduced by simply increasing the size of the contact portion in the Z-axis direction.
  • the movement stroke of the AF movable section 11 can be easily lengthened without damage.
  • the OIS piezoelectric element 52 vibrates, and the OIS resonator 51 deforms in a manner that corresponds to the frequency.
  • the OIS power transmission sections 60X, 60Y are slid in the X-axis direction or the Y-axis direction by the driving force of the OIS drive units 50X, 50Y.
  • the OIS movable section 10 moves in the X-axis direction or the Y-axis direction, and shake correction is performed. Since the OIS support parts 41 and 42 are formed of balls, the OIS movable part 10 can move smoothly in the X-axis direction or the Y-axis direction.
  • the power is transferred from the first stage 12 where the Y-axis direction drive unit 50Y is disposed to the second stage 13. is transmitted.
  • the OIS support part 41 held between the second stage 13 and the base 21 cannot roll in the Y-axis direction, the position of the second stage 13 in the X-axis direction with respect to the base 21 is maintained.
  • the OIS support part 42 held between the first stage 12 and the second stage 13 can roll in the Y-axis direction, the first stage 12 moves in the Y-axis direction with respect to the second stage 13. It turns out.
  • the X-axis direction drive unit is operated based on a detection signal indicating angular shake from a shake detection section (for example, a gyro sensor, not shown) so that the angular shake of the camera module A is canceled out.
  • the voltage applied to the drive unit 50X and Y-axis direction drive unit 50Y is controlled.
  • the translational movement of the OIS movable section 10 may be controlled by feeding back the detection result of the position detection section.
  • the optical element driving device 1 has the following features singly or in appropriate combinations.
  • the optical element driving device 1 includes a base 21 (fixed part) and a lens part 2 (optical element), and the OIS support part 41 (rolling element) is moved relative to the base 21. ) and a base 21 (an active member consisting of either a fixed part or a movable part), and the second stage 13 is movable with respect to the base 21.
  • an ultrasonic motor type X-axis direction drive unit 50X drive section
  • a second stage 13 passive side member consisting of the other of a fixed section and a movable section
  • an X-axis direction drive unit 50X an ultrasonic motor type X-axis direction drive unit 50X.
  • the X-axis direction drive unit 50X has an OIS resonance section 51 having a pair of vibrating arms 511 and 512
  • the X-axis direction power transmission section 60X has an OIS ball holding section 135A (guide section) that guides the OIS support section 41. ), and is held in a biased state by a pair of arms 511 and 512.
  • the movement of the OIS movable section 10 including the second stage 13 in the X-axis direction with respect to the OIS fixed section 20 including the base 21 is stabilized, and driving performance can be improved, and the optical element drive device 1 , the reliability of the camera module A and the smartphone M (camera-equipped device) is improved.
  • the optical element driving device 1 includes a second stage 13 (fixed section) and a lens section 2 (optical element), and an OIS support section relative to the second stage 13. 42 (rolling elements), and a second stage arranged on the first stage 12 (active side member consisting of either a fixed part or a movable part).
  • an ultrasonic motor-type Y-axis direction drive unit 50Y driving section that moves the first stage 12 relative to the second stage 13 (passive side member consisting of the other of a fixed section and a movable section).
  • the Y-axis direction drive unit 50Y has an OIS resonance section 51 having a pair of vibrating arms 511 and 512
  • the Y-axis direction power transmission section 60Y has an OIS ball holding section 134A (guide section) that guides the OIS support section 42. ), and is held in a biased state by a pair of arms 511 and 512.
  • the movement of the OIS movable section 10 including the first stage 12 in the Y-axis direction with respect to the OIS fixed section 20 including the second stage 13 is stabilized, driving performance can be improved, and the optical element drive
  • the reliability of the device 1, camera module A, and smartphone M (camera-equipped device) is improved.
  • the optical element driving device 1 includes a first stage 12 (fixed section) and a lens section 2 (optical element), and an AF support section relative to the first stage 12.
  • the AF movable part 11 (movable part) is movable via the AF movable part 15 (rolling element) and the first stage 12 (an active side member consisting of either a fixed part or a movable part). 12; an AF drive unit 70 of an ultrasonic motor type that moves the AF movable part 11 relative to the AF movable part 12; and an AF power transmission section 80 that connects the AF drive unit 70 and transmits the power of the AF drive unit 70 to the AF movable section 11.
  • the AF drive unit 70 has an AF resonance section 71 having a pair of vibrating arms 711 and 712, and the AF power transmission section 80 has an AF ball holding section 114 (guide section) that guides the AF support section 15. , are held in a biased state by a pair of arms 711 and 712. This stabilizes the movement of the AF movable unit 11 in the Z-axis direction with respect to the first stage 12, and improves drive performance. equipment) reliability is improved.
  • the OIS power transmission sections 60X, 60Y and the AF power transmission section 80 are formed of a different material from the second stage 13 and the AF movable section 11 (passive side member), and are It is fixed so that it cannot be displaced.
  • the second stage 13 and the AF movable section 11, which are passive side members can be easily provided with a function as a power transmission section while suppressing an increase in weight, thereby ensuring appropriate drive performance. Can be done.
  • the X-axis direction power transmission section 60X and the Y-axis direction power transmission section 60Y are less likely to deform than the pair of arms 511, 512, and the X-axis direction power transmission section 60X and Y in the direction sandwiched by the pair of arms 511, 512.
  • the width of the axial power transmission section 60Y is larger than the width of the separation between the pair of arms 511 and 512.
  • the AF power transmission section 80 is less likely to deform than the pair of arms 711, 712, and the width of the AF power transmission section 80 in the direction in which it is sandwiched by the pair of arms 711, 712 is determined by the distance between the pair of arms 711, 712. greater than the width. Thereby, the state of contact between the AF power transmission section 80 and the arms 711, 712 is maintained even if the AF power transmission section 80 moves.
  • the driving performance is improved compared to the case where the AF power transmission section 80 is urged against the arms 711 and 712 using the restoring force generated in the plate-shaped member.
  • the power transmission structure characteristic of the present invention is applied to the X-axis direction drive unit 50X, the Y-axis direction drive unit 50Y, and the AF drive unit 70, but the X-axis direction drive unit 50X,
  • the present invention may be applied to only one of the Y-axis direction drive unit 50Y and the AF drive unit 70.
  • the X-axis direction drive unit 50X, the Y-axis direction drive unit 50Y, and the AF drive unit 70 are all configured with ultrasonic motor type actuators, but the power transmission characteristic of the present invention is The drive unit to which this structure is not applicable does not need to be of the ultrasonic motor type.
  • the optical element driving device 1 having the AF function and the OIS function has been described as an example, but the present invention is applicable to an optical element driving device having one of the AF function and the OIS function. You can also.
  • the smartphone M which is a camera-equipped mobile terminal
  • the present invention provides a camera module that processes image information obtained by the camera module. It can be applied to a camera-equipped device having an image processing section.
  • Camera-equipped devices include information equipment and transportation equipment.
  • Information devices include, for example, a camera-equipped mobile phone, a notebook computer, a tablet terminal, a portable game machine, a web camera, and a camera-equipped vehicle-mounted device (for example, a back monitor device, a drive recorder device).
  • transportation equipment includes, for example, automobiles and drones (unmanned aerial vehicles).
  • FIGS. 13A and 13B are diagrams showing a car V as a camera mounting device equipped with a vehicle camera module VC (Vehicle Camera).
  • 13A is a front view of the automobile V
  • FIG. 13B is a rear perspective view of the automobile V.
  • the automobile V is equipped with the camera module A described in the embodiment as the in-vehicle camera module VC.
  • the in-vehicle camera module VC is attached, for example, to a windshield facing forward, or to a rear gate facing rearward.
  • This in-vehicle camera module VC is used for back monitors, drive recorders, collision avoidance control, automatic driving control, and the like.
  • the optical element driving device 1 that drives the lens section 2 as an optical element has been described, but the optical element to be driven may be an optical element other than a lens, such as a mirror or a prism.
  • Optical element drive device 10 OIS movable part (movable part) 11 AF movable part (movable part) 114 AF ball holding part (guide part) 12 1st stage (active side member) 13 2nd stage (passive side member) 134A, 135A OIS ball holding part (guide part) 15 AF support part (rolling element) 20 OIS fixed part (fixed part) 21 Base (active side member) 41, 42 OIS support part (rolling element) 50X X-axis direction drive unit (drive unit) 50Y Y-axis direction drive unit (drive unit) 51 OIS resonance part (resonance part) 60X X-axis direction power transmission section 60Y Y-axis direction power transmission section 70 AF drive unit (drive section) 80 AF power transmission unit A Camera module M Smartphone (camera mounted device)

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Adjustment Of Camera Lenses (AREA)
  • Lens Barrels (AREA)
  • Studio Devices (AREA)

Abstract

La présente invention concerne un dispositif d'entraînement d'élément optique fiable, un module de caméra et un dispositif équipé d'une caméra qui sont capables de stabiliser le mouvement d'une partie mobile. Le dispositif d'entraînement d'élément optique comprend une partie fixe, une partie mobile qui comprend un élément optique et qui peut être déplacée par rapport à la partie fixe par l'intermédiaire d'un corps roulant, une partie d'entraînement de type moteur à ultrasons positionnée sur un élément côté actif, celui-ci étant soit la partie fixe ou la partie mobile, et servant à déplacer la partie mobile par rapport à la partie fixe, et une partie de transmission de puissance servant à relier la partie d'entraînement à un élément côté passif, celui-ci étant l'autre partie parmi la partie fixe et la partie mobile, afin de transmettre la puissance de la partie d'entraînement à l'élément côté passif. La partie d'entraînement comporte une partie résonante dotée d'une paire de bras vibrants, et la partie de transmission de puissance comporte une partie de guidage servant à guider le corps roulant et est prise en sandwich dans un état où elle est poussée par la paire de bras.
PCT/JP2023/022285 2022-08-31 2023-06-15 Dispositif d'entraînement d'élément optique, module de caméra et dispositif équipé d'une caméra WO2024048012A1 (fr)

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JP2022138102A JP2024034090A (ja) 2022-08-31 2022-08-31 光学素子駆動装置、カメラモジュール、及びカメラ搭載装置
JP2022-138102 2022-08-31

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1944639A1 (fr) * 2007-01-11 2008-07-16 STMicroelectronics (Research & Development) Limited Appareil de focalisation
US20110122517A1 (en) * 2009-11-20 2011-05-26 Samsung Electro-Mechanics Co., Ltd. Camera module and lens driving device
WO2021200980A1 (fr) * 2020-03-30 2021-10-07 ミツミ電機株式会社 Dispositif d'actionnement d'élément optique, module de dispositif de prise de vues et dispositif équipé d'un dispositif de prise de vues
JP7075030B1 (ja) * 2020-11-24 2022-05-25 ミツミ電機株式会社 光学素子駆動装置、カメラモジュール、及びカメラ搭載装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1944639A1 (fr) * 2007-01-11 2008-07-16 STMicroelectronics (Research & Development) Limited Appareil de focalisation
US20110122517A1 (en) * 2009-11-20 2011-05-26 Samsung Electro-Mechanics Co., Ltd. Camera module and lens driving device
WO2021200980A1 (fr) * 2020-03-30 2021-10-07 ミツミ電機株式会社 Dispositif d'actionnement d'élément optique, module de dispositif de prise de vues et dispositif équipé d'un dispositif de prise de vues
JP7075030B1 (ja) * 2020-11-24 2022-05-25 ミツミ電機株式会社 光学素子駆動装置、カメラモジュール、及びカメラ搭載装置

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