Photocopying – Contact printing – Light boxes
Patent
1978-09-05
1980-03-25
Hix, L. T.
Photocopying
Contact printing
Light boxes
355 27, 219216, G03D 1300
Patent
active
041948262
ABSTRACT:
The length of time a heat source is applied to a heat responsive film to develop the same is controlled electrically by a control circuit which repeatedly samples the temperature of the heat source when it is applied to the film beginning with the instant the heat source is applied thereto. Means are provided which computes a running average temperature of the heat source during the various temperature sampling times over a progressively varying period beginning with the instant the heat source is applied to the film and computes from a temperature which is a function of the running average temperature over said period the desirable exposure time from a formula which is or approximates the exposure time versus assumed constant temperature curve recommended by the film manufacturer. The control circuit further includes timing means which provides an indication of the progressively increasing time duration between the beginning of the exposure period and the particular instant of time involved, and comparison means which compares the time measured by the time measuring means and the time computed from said formula. The heat source is removed from the film when the comparison means indicates that the time indicated by the time measuring means and the time computed from said formula correspond.
REFERENCES:
patent: 3566151 (1971-02-01), Wilburn
patent: 3966317 (1976-06-01), Wacks et al.
Energy Conversion Devices Inc.
Hix L. T,.
Perkey William B.
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