Aperture device for a camera

Details Aperture device for a camera Aperture device for a camera

1995-08-18

1996-12-31

Blankenship, Howard B.

Photography

Camera detail

Diaphragm

396510, G03B 902

Patent

active

055899064

ABSTRACT:
A light-controlling variable aperture incorporates a resilient opaque tube positioned along the optical axis. When the resilient opaque tube is twisted, a constricting circular aperture forms a circular iris in an intermediate portion thereof. The circular iris is constricted to various sizes according to the degree of twisting of the tube to control the amount of light passing therethrough.

REFERENCES:
patent: 2481660 (1949-09-01), Harrison
patent: 3456351 (1969-07-01), Gehmann
patent: 4774537 (1988-09-01), Moody
patent: 4897681 (1990-01-01), Yamamoto et al.
patent: 5099334 (1992-03-01), Ogata et al.

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