Illuminated ground glass for camera

Details Illuminated ground glass for camera Illuminated ground glass for camera

1976-08-02

1978-07-18

Griffin, Donald A.

354155, G03B 1302, G03B 1912

Patent

active

041019164

ABSTRACT:
To facilitate viewing of scenes photographed by a motion picture camera under dim lighting conditions, a viewing system for aiming and focusing the motion picture camera incorporates a ground glass plate and a beam splitter with the light from a scene photographed being, in turn, reflected from a conventional rotating camera shutter, through the ground glass plate and then reflected from one side of a beam splitter and then through an optical system to an eyepiece. A solid state lamp such as red light emitting diodes are disposed on the other side of the beam splitter with the red light being transmitted through the beam splitter onto the ground glass plate which has a set of lines defined by metal strips from which the red light is reflected back onto the beam splitter and to the eyepiece, such set of lines defining the boundary within which the scenes are required to be located.

REFERENCES:
patent: 1140108 (1915-05-01), Brown
patent: 1897268 (1933-02-01), Merle
patent: 2105557 (1938-01-01), Slack
patent: 3100430 (1963-08-01), Morelle
patent: 3357328 (1967-12-01), Kinder et al.
patent: 3393623 (1968-07-01), Gutmann et al.
patent: 3765754 (1973-10-01), Winkler

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