Method of and apparatus for heat processing photosensitive...

G - Physics – 03 – D

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Details

CPC

95/86

IPC codes

G03D 3/00 (2006.01) G03D 11/00 (2006.01) G03D 13/00 (2006.01) G05D 23/24 (2006.01) H05B 3/00 (2006.01)

Type

Patent

Patent number

CA 1143600

Description

Case 04-4182-U.S. APPLICATION OF GARY R. SIMPSON METHOD OF AND APPARATUS FOR HEAT PROCESSING PHOTOSENSITIVE MATERIAL ABSTRACT OF THE DISCLOSURE In the method and apparatus disclosed herein, heat processing pulsing current is passed, on command, through the conductive backing of an exposed record sheet of heat-processable photosensitive material. The sheet resistance is included as one arm of a bridge which contains a settable comparison resistance in another arm. The cold sheet resistance is sensed and is used by a sample and hold arrangement to set the comparison resistance to a corresponding comparison value which represents the cold sheet resistance multiplied by a preselected percentage. That percentage is one which is known to correspond to the desired processing temperature to which the sheet temperature is to be raised in order to effect the processing of the sheet. The passage of the heat processing current is terminated when equality is detected between two signals which represent, respectively, the prevailing sheet and comparison resistances, that equality indicating that the prevailing sheet resistance has arrived at a final resistance which equals the cold sheet resistance times the preselected percentage, and which therefore corresponds to the desired processing temperature.

Application Number

351803

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