Lens drive device, camera module, and camera-mounted device

Patent metadata

Field	Value
Publication number	US-11009719-B2
Application number	US-201616077071-A
Country	US
Kind code	B2
Filing date	Feb 10, 2016
Priority date	Feb 10, 2016
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

This lens drive device is provided with an AF drive part and image stabilization drive part using the driving force of a VCM. a pair of power supply suspension wires and a pair of signal suspension wires couple an image stabilization fixed part with an AF fixed part. The AF fixed part includes an AF power supply line, a signal line, a coil power supply line, and an AF control part. The AF control part includes: a Hall element detecting the position of the AF movable part in the optical axis direction; a coil control part controlling the energizing current for an AF coil on the basis of a control signal supplied through the signal suspension wires and the detection results of the Hall element; and an autofocus circuit board whereon the Hall element and the coil control part are mounted.

First claim

The invention claimed is:

1. A lens driving device, comprising:
an auto-focusing driving part including:
an auto-focusing coil part to be disposed at a periphery of a lens part,
an auto-focusing magnet part to be disposed to be radially spaced apart from the auto-focusing coil part, and
an auto-focusing supporting member configured to support, with respect to an autofocus fixing part including the auto-focusing magnet part, an autofocus movable part including the auto-focusing coil part, the autofocus movable part being supported to be movable in an optical-axis direction, the auto-focusing driving part being configured to perform automatic focusing by utilizing a driving force of a voice coil motor composed of the auto-focusing coil part and the auto-focusing magnet part; and
a shake-correcting driving part including:
a shake-correcting magnet part to be disposed in the auto-focusing driving part,
a shake-correcting coil part to be disposed to be spaced apart from the shake-correcting magnet part in the optical-axis direction, and
a shake-correcting supporting member configured to support, with respect to a shake-correcting fixing part including the shake-correcting coil part, a shake-correcting movable part including the shake-correcting magnet part, the shake-correcting movable part being supported to be able to sway in an optical-axis-orthogonal plane, the shake-correcting driving part being configured to perform shake correction by utilizing a driving force of an another voice coil motor composed of the shake-correcting coil part and the shake-correcting magnet part,
wherein the shake-correcting supporting member is composed of a pair of power-supplying suspension wires and a pair of signal suspension wires, the shake-correcting supporting member connecting the shake-correcting fixing part to the autofocus fixing part,
wherein the autofocus movable part includes a position-detecting magnet,
wherein the autofocus fixing part includes:
a pair of auto-focusing power-source lines to be connected to the pair of power-supplying suspension wires,
a pair of signal lines to be connected to the pair of signal suspension wires,
an auto-focusing control part to be electrically connected to the pair of power-supplying suspension wires and the pair of signal suspension wires via the pair of auto-focusing power-source lines and the pair of signal lines, and
a coil power-supply line configured to electrically connect the auto-focusing control part to the auto-focusing coil part, and
wherein the auto-focusing control part includes:
a Hall element to be disposed to face the position-detecting magnet, the Hall element being configured to detect a position of the autofocus movable part in the optical-axis direction based on a change in magnetic field,
a coil control part configured to control an energization current through the auto-focusing coil part based on a control signal to be provided via the pair of signal suspension wires and based on a detection result of the Hall element, and
an auto-focusing circuit board on which the Hall element and the coil control part are to be mounted,
wherein the auto-focusing power-source lines, the signal lines and the coil power-supply line are disposed on the same plane of the light reception side in the optical axis direction of the autofocus fixing part in such a manner as not to be in contact with one another.

2. The lens driving device according to claim 1 , wherein
the Hall element and the coil control part are respectively a built-in Hall element and a built-in coil control part included in a single Integrated Circuit.

3. The lens driving device according to claim 1 , wherein
the auto-focusing supporting member functions as the coil power-supply line and are disposed on the inner side the auto-focusing power-source lines and the signal lines.

4. The lens driving device according to claim 1 ,
wherein the autofocus fixing part includes a magnet holder, the magnet holder including:
a rectangular frame,
a magnet holding portion configured to hold the auto-focusing magnet part along four sides of the rectangular frame, and
a housing in which the auto-focusing control part is to be disposed,
wherein the autofocus movable part includes a lens holder, the lens holder including a cylindrical lens housing and a coil winding portion on which the auto-focusing coil part is to be wound,
wherein the lens holder is disposed inside the magnet holder such that the auto-focusing coil part faces the auto-focusing magnet part, and
wherein the pair of auto-focusing power-source lines, the pair of signal lines, and the coil power-supply line, as a whole, have a shape similar to a shape of the rectangular frame, and are routed on or above the rectangular frame.

5. A camera module, comprising:
the lens driving device according to claim 1 ;
a lens part to be mounted on the autofocus movable part; and
an image capturing part configured to capture a subject image imaged by the lens part.

6. A camera-mounted device that is an information device or a transporting device, the camera-mounted device comprising:
the camera module according to claim 5 ; and
a control part configured to process image information obtained by the camera module.

Assignees

• Murakami Tomoyuki
• Mitsumi Electric Co Ltd

Inventors

• Murakami Tomoyuki

Classifications

• H04N23/60

  Control of cameras or camera modules · CPC title

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• G03B5/00 Primary

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title

• G02B7/08

  adapted to co-operate with a remote control mechanism · CPC title