Lens driving device

Patent metadata

Field	Value
Publication number	US-9298017-B2
Application number	US-201514698918-A
Country	US
Kind code	B2
Filing date	Apr 29, 2015
Priority date	Jul 15, 2011
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A lens holder driving device includes an auto-focusing lens holder driving portion moving a lens holder holding a lens barrel along an optical axis, and an image stabilizer portion stabilizing image blurred by moving the auto-focusing lens holder driving portion in first and second directions which are orthogonal to the optical axis and which are perpendicular to each other. The image stabilizer portion includes: a fixed portion disposed apart from the auto-focusing lens holder driving portion in the direction of the optical axis; a plurality of suspension wires having first end portions fixed to the fixed portion at outer regions thereof, extending along the optical axis, having second end portions fixed to the auto-focusing lens holder driving portion, and swingably supporting the auto-focusing lens holder driving portion in the first direction and the second direction; and a fracture preventing member preventing the suspension wires from fracturing.

First claim

What is claimed is:

1. A lens driving device comprising:
an auto-focusing lens driving portion moving a lens holder holding a lens barrel along an optical axis; and
an image stabilizer portion stabilizing blurred image by moving said auto-focusing lens driving portion in first and second directions which are orthogonal to the optical axis and which are perpendicular to each other, wherein said image stabilizer portion comprises:
a base disposed apart from said auto-focusing lens driving portion in the direction of the optical axis;
a plurality of suspension wires having first end portions fixed to said base at outer regions thereof, said plurality of suspension wires extending along the optical axis and having second end portions fixed to said auto-focusing lens driving portion, said plurality of suspension wires swingably supporting said auto-focusing lens driving portion in the first direction and the second direction; and
a fracture preventing member preventing said plurality of suspension wires from fracturing, wherein
said auto-focusing lens driving portion comprises;
a lens holder comprising a tubular portion holding said lens barrel;
a focusing coil fixed to said lens holder so as to position around said tubular portion thereof;
a permanent magnet disposed opposite to said focusing coil;
a magnet holder disposed around an periphery of said lens holder and holding said permanent magnet at an outside of said focusing coil;
first and second leaf springs mounted to the first and second ends of said magnet holder, and supporting said lens holder shiftably in the direction of the optical axis so as to position said lens holder in a radial direction, said first leaf spring being disposed farther apart from said base than said second leaf spring; and
a plurality of projecting portions, as a fracture prevention supporting member supporting prevention of fracture in said plurality of suspension wires, projecting in the direction of the optical axis from the first end of said magnet holder to which said first leaf spring is mounted,
the second end portions of said plurality of suspension wires are fixed to said first leaf spring, and
said first leaf spring comprises a wire fixing portion extending around each of said plurality of protecting portions and having parts to which the second end portions of said plurality of suspension wires are fixed, said wire fixing portion serving as said fracture preventing member.

2. The lens driving device according to claim 1 , wherein
said first leaf spring further comprises a plurality of openings through which said plurality of projecting portions project respectively, and
said wire fixing portion extends so as to define part of each of said plurality of openings.

3. The lens driving device according to claim 1 , wherein
said first leaf spring comprises:
an inner end portion mounted to said lens holder;
an outer end portion mounted to said magnet holder; and
a plurality of arm portions connecting said inner end portion to said outer end portion, and
said wire fixing portion comprises a plurality of arc-shaped extending portions extending from said outer end portion in the radial direction outwards.

4. The lens driving device according to claim 3 , wherein
said plurality of arc-shaped extending portions comprises wire fixing holes in which the second end portions of said plurality of suspension wires are inserted, respectively, and
the second end portions of said plurality of suspension wires are inserted in the wire fixing holes of said plurality of arc-shaped extending portions to be fixed to said plurality of arc-shaped extending portions by means of solder or adhesive agent, respectively.

5. The lens driving device according to claim 4 , wherein each of said plurality of arc-shaped extending portions has an L-shape.

6. The lens driving device according to claim 1 , further comprising a cover covering said auto-focusing lens driving portion at an opposed side to said base, wherein
said fracture prevention supporting member comprises a plurality of stoppers projecting from said magnet holder toward an inner wall of said cover.

7. The lens driving device according to claim 1 , wherein
said permanent magnet comprises four permanent magnet pieces which have first surfaces opposed to said focusing coil and which are disposed outside of said focusing coil with respect to the optical axis in the radial direction so as to oppose each other in the first direction and the second direction.

8. The lens driving device according to claim 7 , wherein
said image stabilizer portion further comprises an image stabilizer coil comprising four image stabilizer coil portions mounted on said base so as to oppose second surfaces of said four permanent magnet pieces that are perpendicular to the first surfaces.

Assignees

• Mitsumi Electric Co Ltd

Inventors

• Sugawara Masayoshi
• Moriya Akihiro
• Sato Keiichi
• Ariji Makoto
• Ajiki Satoshi

Classifications

• H04N23/685

  performed by mechanical compensation · CPC title

• H04N23/57

  Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices · CPC title

• H04N5/2257

  Electricity · mapped topic

• G03B2205/0069

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

• G03B2205/0015

  by displacing one or more optical elements normal to the optical axis · CPC title