Method of and apparatus for heat processing photosensitive mater

Details Method of and apparatus for heat processing photosensitive mater Method of and apparatus for heat processing photosensitive mater

1979-06-14

1981-05-12

Grimley, Arthur T.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219216, 219494, 219497, 346136, H05B 102, G01D 1510

Patent

active

042674344

ABSTRACT:
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.

REFERENCES:
patent: 3603768 (1971-09-01), Ireland
patent: 4083054 (1978-04-01), Moraw et al.
patent: 4102298 (1978-07-01), Dietze et al.
patent: 4104692 (1978-08-01), Sudo et al.

Affiliated with

Also associated with

Rating

Method of and apparatus for heat processing photosensitive mater does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of and apparatus for heat processing photosensitive mater, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and apparatus for heat processing photosensitive mater will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2048504