Lens drive device, camera module, and camera mount device

Patent metadata

Field	Value
Publication number	US-11520118-B2
Application number	US-201716311729-A
Country	US
Kind code	B2
Filing date	Jun 14, 2017
Priority date	Jun 24, 2016
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

This lens drive device 1 comprises: an autofocus drive unit for performing autofocus using a driving force of a voice coil motor configured from a first coil part 112 and a magnet part 122 ; and a shake correction drive unit for performing shake correction using a driving force of a voice coil motor configured from a second coil part 231 and the magnet part 122 . The magnet part 122 includes first magnets 122 A, 122 C disposed at two mutually facing sides among the four sides of a substantially rectangular-shaped lens drive device in a plan view, and a second magnet 122 B disposed at another side. The side the second magnet 122 B faces is designated a no-magnet disposed section R where no magnet is disposed.

First claim

The invention claimed is:

1. A lens driving device, comprising:
an auto-focusing driving part including:
a first coil part to be disposed at a periphery of a lens holder that holds a lens part;
a magnet part to be disposed to be spaced apart in a radial direction from the first coil part; and
a first supporting member configured to support, with respect to an autofocus fixing part including the magnet part, an autofocus movable part including the first coil part such that the autofocus movable part is 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 first coil part and the magnet part; and
a shake-correcting driving part including:
the magnet part to be disposed in the auto-focusing driving part;
a second coil part to be disposed to be spaced apart in the optical-axis direction from the magnet part; and
a second supporting member configured to support, with respect to a shake-correcting fixing part including the second coil part, a shake-correcting movable part including the magnet part such that the shake-correcting movable part is allowed 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 another voice coil motor composed of the second coil part and the magnet part, wherein:
the magnet part is substantially rectangular in plan view and includes first magnets to be disposed respectively at two opposite sides of four sides of the magnet part and a second magnet to be disposed at a further side of the four sides, and a side positioned opposite the second magnet is a no-magnet-disposing part in which no magnet is disposed,
a balance weight of a non-magnetic material is disposed in the no-magnet-disposing part,
the second coil part includes a plurality of coils disposed to the shake-correction fixing part such that the plurality of coils face the respective first magnets at the two opposite sides of the four sides and the second magnet at the further side of the four side, the two opposite sides being adjacent to the side in which the balance weight is disposed, and the second coil part is not disposed in the side in which the balance weight is disposed, and
the first coil part includes a plurality of planar coils disposed to the lens holder such that the plurality of planar coils face the respective first magnets disposed in the two opposite sides which are adjacent to the side in which the balance weight is disposed, and the first coil part is not disposed in the side in which the balance weight is disposed nor in the further side which is opposite the side in which the balance weight is disposed.

2. The lens driving device according to claim 1 , wherein
the lens holder is disposed at a position shifted toward the no-magnet-disposing part inside a magnet holder that holds the magnet part.

3. The lens driving device according to claim 2 , wherein
the second magnet has a size greater than a size of each of the first magnets.

4. The lens driving device according to claim 1 , wherein
the first magnets are disposed at respective positions shifted toward the no-magnet-disposing part.

5. The lens driving device according to claim 4 , wherein
a shape of the first coil part is such that a region of the first coil part facing each of the first magnets and a region of the first coil part facing the second magnet have a length substantially the same as one another.

6. The lens driving device according to claim 1 , wherein
the second magnet is magnetized such that a magnetized region of the second magnet as seen in a section perpendicular to a longitudinal direction of the second magnet is divided into two magnetized regions in the optical-axis direction while divided into two magnetized regions in the radial direction, and wherein adjacent pairs of the divided magnetized regions have magnetic poles different from each other.

7. The lens driving device according to claim 1 , further comprising:
a yoke to be interposed between the second magnet and the first coil part.

8. The lens driving device according to claim 7 , wherein
the yoke is disposed along an outer edge portion of the magnet holder so as to extend from between the second magnet and the first coil part to peripherally surround the first magnets.

9. A camera module, comprising:
the lens driving device according to claim 1 .

10. A camera mount device, comprising:
the camera module according to claim 9 .

Assignees

• Konuma Shinsuke
• Murakami Tomoyuki
• Kudo Shota
• Enta Yohei
• Mitsumi Electric Co Ltd

Inventors

• Konuma Shinsuke
• Murakami Tomoyuki
• Kudo Shota
• Enta Yohei

Classifications

• H04N23/55

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

• G02B7/023

  permitting adjustment · CPC title

• G02B7/09 Primary

  adapted for automatic focusing or varying magnification · CPC title

• G03B5/02

  Lateral adjustment of lens · CPC title

• G02B13/001

  Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras (G02B23/243 takes precedence) · CPC title