Lens driving device, camera module, and camera-mounted apparatus

Patent metadata

Field	Value
Publication number	US-12111460-B2
Application number	US-202017595524-A
Country	US
Kind code	B2
Filing date	May 22, 2020
Priority date	May 22, 2019
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

This lens driving device is configured separately from a lens unit including a liquid lens, and is provided with: a fixed part; a movable part; a support part that supports the movable part with respect to the fixed part; a driving unit that is formed from a voice coil motor comprising a coil and a magnet and that moves the movable part in an optical axis direction with respect to the fixed part; and a lens deformation unit that is connected to the movable part and that applies, in association with the movement of the movable part, a force to the liquid lens in the optical axis direction. The movable part has a plurality of movable units, and the driving unit drives the movable units independently so as to change the curvature of the liquid lens or to change the optical axis of the liquid lens.

First claim

The invention claimed is:

1. A lens driving device that applies a force to the liquid lens to change a focal length and an optical axis of the liquid lens, the lens driving device comprising:
a fixed part;
a movable part disposed apart from the fixed part;
a first elastic support member and a second elastic support member that elastically connect the movable part and the fixed part to each other and supports the movable part with respect to the fixed part;
a driving part including a voice coil motor that includes a coil and a magnet, the driving part being for moving the movable part with respect to the fixed part in a direction of the optical axis; and
a lens deforming part connected to the movable part, the lens deforming part being for applying a force to the liquid lens in the direction of the optical axis in accordance with a movement of the movable part, wherein:
the movable part includes a plurality of movable units,
the coil is disposed in each of the plurality of movable units,
the magnet is disposed at each of positions in the fixed part, the positions corresponding to the plurality of movable units,
the plurality of movable units each includes a control Integrated Circuit (IC) that controls energization of the coil,
the first elastic support member is electrically connected to a wiring disposed at the fixed part and a power supply terminal of the control IC, and connects the power supply terminals in adjacent movable units of the plurality of movable units to each other,
the second elastic support member is electrically connected to a wiring disposed at the fixed part and a signal terminal of the control IC, and connects the signal terminals in the adjacent movable units to each other, and
the driving part drives the plurality of movable units independently in such a way that a curvature of the liquid lens changes or the optical axis of the liquid lens changes.

2. The lens driving device according to claim 1 , wherein:
the elastic support member is electrically connected to the wiring by a jumper wire extending from the fixed part toward a light receiving side in the direction of the optical axis.

3. A camera module, comprising:
the lens driving device according to claim 1 ;
the lens unit; and
an image capturing part that captures a subject image formed by the lens unit.

4. A camera-mounted device that is an information device or a transporting device, the camera-mounted device comprising:
the camera module according to claim 3 ; and
an image processing part that processes image information obtained by the camera module.

Assignees

• Osaka Tomohiko
• Hayashi Ichiro
• Kikuchi Atsushi
• Mitsumi Electric Co Ltd

Inventors

• Osaka Tomohiko
• Hayashi Ichiro
• Kikuchi Atsushi

Classifications

• H02K41/0356 Primary

  moving along a straight path · CPC title

• G03B2205/0069

  using electromagnetic actuators, e.g. voice coils · CPC title

• G03B2205/0007

  Movement of one or more optical elements for control of motion blur · CPC title

• G03B13/36

  Autofocus systems · CPC title

• G02B27/646

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title