Diaphragm device

Details Diaphragm device Diaphragm device

1975-12-24

1977-09-13

Corbin, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

350162SF, 354274, 358 55, G03B 902

Patent

active

040478076

ABSTRACT:
A diaphragm device in which a plurality of diaphragm blades are arranged in partly overlapping relation to one another. This diaphragm device provides a diaphragm aperture of a substantially elongated circle having its length extending in a specific direction, when stopped down beyond a given diaphragm aperture. More particularly, the diaphragm aperture is defined by a pair of arcs which oppose each other in a direction perpendicular to the specific direction passing through the center of the aperture and another pair of arcs which are disposed on the opposite sides in the aforesaid specific direction, while the distance of either one of the pair of arcs to the center of the aperture is shorter than the distance of either of the other pair of arcs to the center of the aperture. These pairs of arcs define portions of the inner peripheral edges of the diaphragm blades.

REFERENCES:
patent: 1302359 (1919-04-01), Garbutt
patent: 3132576 (1964-05-01), Mahn
patent: 3768888 (1973-10-01), Nishino et al.

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