Front and rear curtain shutter device with start area

Details Front and rear curtain shutter device with start area Front and rear curtain shutter device with start area

2008-05-06

2008-05-06

Lee, Diane I. (Department: 2851)

Photography

Camera detail

Shutter

C396S469000

Reexamination Certificate

active

11702336

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: 6818287 (2004-11-01), Ogawa et al.
patent: 2002/0037171 (2002-03-01), Kasahara
patent: 8-220592 (1996-08-01), None
patent: 08-220592 (1996-08-01), None
US 5,682,420, 1/1999, Akimoto et al. (withdrawn).

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