Cryogenic cameras

Details Cryogenic cameras Cryogenic cameras

1975-03-27

1977-07-26

Hix, L. T.

354354, G03B 2900

Patent

active

040386694

ABSTRACT:
A Cryogenic Camera in which an aluminum refrigeration chamber filled with dry ice or liquid nitrogen makes contact with the back of a metallic filmholder upon closing the hinged back of the camera, to which the refrigeration chamber is bolted. The filmholder is positioned within the camera body so as to form a small volume in front of the film. This volume contains a silica gel dessicant packet that absorbs moisture in this volume, which is sealed upon closing the aforementioned hinged back. Thus frosting of the film and of the Plexiglas window that seals the camera aperture is prevented. The presence of this volume allows integration of an off-axis guide system within the camera, the guide system consisting of a flip-up mirror, rheostat controlled illuminated crosshairs, and a focussing eyepiece. The crosshairs illumination is provided by a red light emitting diode powered by two penlight cells contained within the volume. With a converted filmholder, both ground glass and Foucault knife-edge focussing of the camera is made possible.

REFERENCES:
patent: 3289557 (1966-12-01), Garcia et al.
patent: 3667358 (1972-06-01), Williams
patent: 3860937 (1975-01-01), Wolfe

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