Stop device for photographic camera

Details Stop device for photographic camera Stop device for photographic camera

1988-05-13

1990-01-30

Hix, L. T.

350449, G03B 902

Patent

active

048976822

ABSTRACT:
A stop device having a plurality of stop blades pivotably disposed about an optical axis with an adjacent pair partially overlapping each other and adapted for defining an aperture opening with their inner edges. Each of the inner edges of the stop blades has a first inner edge portion for partially defining a circular aperture opening when the stop device is set to the full aperture position or a position equivalent thereto and a second inner edge portion for partially defining a substantially circular small aperture opening when the stop device is set to a predetermined intermediate aperture position for providing an aperture opening smaller than that provided in the full aperture position. Accordingly, this stop device is capable of providing the substantially circular aperture opening not only in the full aperture position but also in the predetermined intermediate aperture position.

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