Patent · US Expired

Photographic camera with liquid-crystal diaphragm arrangement

US3955208A · kind A · utility

31Cited by

1References

10Claims

0Family size

Assignee

AGFA-Gervaert AG · DE

Inventors

Richard Wick
Eduard Wagensonner · Aschheim, DE
Karl Wagner · Munich, DE

Key dates

Filing date	Jun 6, 1974
Grant date	May 4, 1976
Priority date	—
Expiry date	Jun 6, 1994

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/13471
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A photographic camera includes a diaphragm arrangement comprised of at least one body of liquid crystal positioned in the path of light entering the camera. The size of the opening of the diaphragm arrangement is changed by changing the transparency of at least one portion of the one or more bodies of liquid crystal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.