Back to results
US 9,297,979 B2Granted
Lens driving device and optical disc apparatus
AssigneeFunai Electric Co., Ltd.
InventorsKazuya Harada, Tetsuo Nishidate, Toyoshi Nogami, Hiromasa Sasaoka
Life of this patent
Estimating the term…
Abstract
A lens driving device includes a lens holder for holding a lens, a supporter portion for supporting the lens holder in a movable manner, a drive portion for driving the lens holder, and an elastic portion for supplying the lens holder with a force in a predetermined direction. The supporter portion includes a shaft engaging with a bearing of the lens holder, and the force in a predetermined direction includes a force in a direction perpendicular to the shaft and a force in a direction to rotate the lens holder about the shaft.
Claims19
A lens driving device comprising:
- a lens;
- a lens holder for holding the lens;
- a shaft for supporting the lens holder, the lens holder being movable in a direction parallel to an optical axis direction of the lens;
- a drive portion for driving the lens holder;
- and
- an elastic member disposed diagonally to a direction parallel to the shaft, the elastic member pulling the lens holder and thereby applying to the lens holder a force acting in such a direction as to press the lens holder onto the shaft.
3 more elements
A lens driving device comprising:
- a lens;
- a lens holder for holding the lens;
- a supporter portion for supporting the lens holder in a movable manner, the supporter portion extending in a direction parallel to an optical axis direction of the lens held on the lens holder;
- a drive portion for driving the lens holder;
- an elastic portion for supplying the lens holder with a force in a predetermined direction;
- a counter electromotive force detection portion for detecting a counter electromotive force generated by drive of the drive portion;
- and
- an abnormality determination portion for determining whether or not there is an abnormality in drive of the lens held by the lens holder on the basis of the counter electromotive force detected by the counter electromotive force detection portion, wherein
- the supporter portion includes a shaft engaging with a bearing of the lens holder and one of a groove rail and a convex rail engaging with a part of the lens holder,
- the force in a predetermined direction includes a force in a direction perpendicular to the shaft, a force in a direction to rotate the lens holder about the shaft, and a force in a direction parallel to the shaft,
- the drive portion includes a coil and a magnet for driving the lens holder by an electromagnetic force, and one of the coil and the magnet is mounted on the lens holder,
- a normal operation range of the lens is set narrower than the movable range of the lens, and
- the abnormality determination portion determines that there is an abnormality in the drive of the lens if it is determined that the lens has not moved on the basis of the counter electromotive force despite that a drive force in the normal operation range is given by the drive portion.
10 more elements
A lens driving device comprising:
- a lens;
- a lens holder for holding the lens;
- a drive portion for driving the lens holder;
- a counter electromotive force detection portion for detecting a counter electromotive force generated by drive of the drive portion;
- and
- an abnormality determination portion for determining whether or not there is an abnormality in drive of the lens held by the lens holder on the basis of the counter electromotive force detected by the counter electromotive force detection portion, wherein
- the drive portion includes a coil and a magnet for driving the lens holder by an electromagnetic force, and one of the coil and the magnet is mounted on the lens holder,
- a normal operation range of the lens is set narrower than the movable range of the lens, and
- the abnormality determination portion determines that there is an abnormality in the drive of the lens if it is determined that the lens has not moved on the basis of the counter electromotive force despite that a drive force in the normal operation range is given by the drive portion.
6 more elements
Dependencies are inferred from the claim text.