Exposing aperture device for a camera

Details Exposing aperture device for a camera Exposing aperture device for a camera

1997-11-21

1999-05-25

Perkey, W. B.

Photography

Camera detail

Diaphragm

G03B 902

Patent

active

059077336

ABSTRACT:
In an exposing aperture device having a pair of exposing diaphragms which are moved in opposite directions while being guided by guide members formed on a base plate, the guide members are each formed of a vertical rising part with a first contact protrusion coming into point contact with the diaphragms and a horizontal ledge part with a second contact protrusion being in point contact with the diaphragms. By projecting the first and second contact protrusions more than burrs which are inevitably left on the rising part and ledge part as the result of forming the base plate by a punching process or a resin molding process, the exposing diaphragms can be moved smoothly and stably to control exposure with a high accuracy without being affected by the burrs.

REFERENCES:
patent: 3228315 (1966-01-01), Platt

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