Lens driving device

Details Lens driving device Lens driving device

2009-01-30

2010-10-26

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With support

C359S814000, C359S698000, C720S683000, C310S012240, C396S055000

Reexamination Certificate

active

07821727

ABSTRACT:
A lens driving device, comprises a base; a casing fixed to the base; a coil bracket disposed within the casing; a coil wound on the coil bracket, a spring disposed within the casing, a drive rod; and a lens holder; wherein, one end of the spring is fixed to the base; one end of the drive rod is fixed to the other end of the spring, and the other end of the drive rod extends out of the casing. The lens holder is slidably fixed to the exposed portion of the drive rod. The lens holder is held stationary with respect to the drive rod by static friction between the drive rod and the lens holder. A driving signal may be applied to the coil to move the lens holder. The driving signal has the characteristic of making the current flowing through the coil slowly increase and then rapidly decrease, or to rapidly increase and then slowly decrease. The drive current is preferably a sawtooth pulse train, with each pulse causing movement of the lens holder in the micron range or below.

REFERENCES:
patent: 5587846 (1996-12-01), Miyano et al.
patent: 5644440 (1997-07-01), Akada
patent: 5745800 (1998-04-01), Kanbara et al.
patent: 5812330 (1998-09-01), Akada
patent: 5859733 (1999-01-01), Miyano et al.
patent: 6628601 (2003-09-01), Kobayashi
patent: 7652712 (2010-01-01), Watanabe et al.
patent: 2008/0055027 (2008-03-01), Kayama et al.

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