Aperture switching device

Details Aperture switching device Aperture switching device

1998-08-07

1999-08-31

Perkey, W. B.

Photography

Camera detail

Diaphragm

G03B 902

Patent

active

059465158

ABSTRACT:
An aperture switching device to be incorporated in a digital cameral for moving an aperture plate having an aperture formed thereon with respect to a lens between a shutting position where the lens is partially covered by the aperture plate with the aperture aligned with the lens and an open position where the lens is not covered by the aperture plate, includes a slide block formed on the aperture plate, a guide member mounted to the lens and having a guide channel to slidably receive the slide block therein. A driving device has an output rod movable along an arc path and mechanically coupled to the aperture plate to reciprocate the slide block along the guide channel so as to move the aperture plate between the shutting position and the open position. The mechanical coupling between the driving device and the aperture plate may include a pinion rotated by the driving device and engaged by a rack provided on the aperture plate. Alternatively, the mechanical coupling may include a transverse channel formed on the aperture plate to receive the output rod of the driving device therein. The transverse channel extends in a direction substantially normal to the movement of the aperture plate so as to convert the arcuated movement of the rod into linear motion of the aperture plate.

REFERENCES:
patent: 2135506 (1938-11-01), Hansch et al.
patent: 3232200 (1966-02-01), Baab et al.
patent: 4063260 (1977-12-01), Toyoshima et al.
patent: 5099334 (1992-03-01), Ogata et al.
patent: 5150702 (1992-09-01), Miyanaga et al.

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