Voice coil motor apparatus for positioning

Details Voice coil motor apparatus for positioning Voice coil motor apparatus for positioning

2007-12-18

2007-12-18

Le, Dang (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Linear

C310S015000

Reexamination Certificate

active

10986189

ABSTRACT:
A voice coil motor apparatus for positioning is disclosed. The voice coil motor is used by the auto-focus lens control module of a miniature camera. The apparatus contains a voice coil motor, a position feedback sensor, and a positioning controller. The voice coil of the voice coil motor can be either movable or stationary, where in the former case the attached power cable is a flexible circuit board, and in the latter case the power cable is fixed. The position feedback sensor includes a photo interrupter, a light reflector, and a bias circuit used for tracking any displacement of the movable part of the motor. The positioning controller uses the voltage signals to be processed through a proportional-integral-differential computation unit to manipulate an output current for accurate positioning of the movable part of the motor within a prescribed range.

REFERENCES:
patent: 5978600 (1999-11-01), Takeuchi et al.
patent: 6006041 (1999-12-01), Mizumaki et al.
patent: 6747631 (2004-06-01), Sakamaki et al.
patent: 6901677 (2005-06-01), Smith et al.
patent: 2004/0118927 (2004-06-01), Breytman et al.

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