Electrode shutter device with start area

Details Electrode shutter device with start area Electrode shutter device with start area

2007-02-27

2007-02-27

Perkey, W. B. (Department: 2851)

Photography

Camera detail

Shutter

Reexamination Certificate

active

10965149

ABSTRACT:
A shutter device includes a stationary plate having a plurality of driving electrodes movable element opposes the stationary plate and including a sheet subjected to an electret-forming process. A drive control unit for moving the movable element using variation in electrostatic force, thereby shielding light. The electrostatic force is generated between constant charges held in the movable element as a result of the electret-forming process, and charges generated in each of the driving electrodes when a voltage is applied to each driving electrode. The generated electrostatic force is varied by varying the voltage applied to each driving electrode.

REFERENCES:
patent: 4313659 (1982-02-01), Saito et al.
patent: 5523639 (1996-06-01), Okamoto et al.
patent: 5862420 (1999-01-01), Akimoto et al.
patent: 6818287 (2004-11-01), Ogawa et al.
patent: 2002/0037171 (2002-03-01), Kasahara
patent: 8-220592 (1996-08-01), None

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