Lens driving device
AssigneeNingbo Chengli Technology Development Co., Ltd.
InventorRenzhao Jin
Life of this patent
Estimating the term…
Abstract
A lens driving device comprises an annular magnet carriage acting as the outer frame of the lens driving device. A magnet and a coil are disposed in the annular magnet carriage. A lens holder with a lens is disposed in the central circular hole of the annular magnet carriage. A front spring with front gasket is disposed in front of the lens holder, and a rear springs with rear gasket is disposed in back of the lens holder. The annular magnet carriage, the front spring, the rear spring, the front gasket, the rear gasket, the lens holder, and the base are all in the shape of flat plate and nested connect with each other to form a position mechanism.
Claims14
A lens driving device comprising:
- an annular magnet carriage disposed on a base, in the magnet carriage at least one magnet and at least one coil are disposed;
- a lens holder for carrying a lens mounted in said coil, being movable forward and backward in said magnet carriage;
- two damping devices resisting the lens movement respectively disposed at front of and back of said lens holder to keep said lens holder balanced and stable, when the electromagnetic force generated by the powered coil overcomes the damping force generated by said damping devices, said lens holder is driven to move forward or backward along the optical axis of the lens;
- a limiting mechanism positioning disposed between said lens holder and said annular magnet carriage for preventing said lens holder from offsetting and moving;
- wherein said annular magnet carriage is externally-square-shaped with a central circular hole and having a hollowed-U-shaped section, so as to form an externally-square-shaped and internally circular-shaped cavity;
- while said magnet being disposed in the corner of said cavity;
- said two damping devices comprise a front spring with a front gasket in front of said lens holder and a rear spring with a rear gasket in back of said lens holder, and said front gasket is mounted on a front sidewall of said cavity of the annular magnet carriage.
Dependencies are inferred from the claim text.