Photo process timer

Abstract

Abstract APPARATUS FOR DETERMINING THE ELAPSE OF A TIMING CYCLE UTILIZED IN HIGH PRODUCTION PHOTOGRAPHIC PROCESS. DIALS CONNECTED TO VARIABLE RESISTORS AND CAPACITORS HAVE INDICIA THEREON CALIBRATED TO PROVIDE VALUES OF TIME UNITS AND DENSITY. MANIPULATION OF THE DENSITY DIALS PRESELECTS RESISTANCE AND CAPACITANCE VALVES TO CONTROL THE POTENTIAL TO WHICH A CAPACITOR IS CHARGED. MOMENTARY DEPRESSION OF A START SWITCH ENERGIZES THE LIGHTING TO BE UTILIZED AND INITIATES DISCHARGE OF THE CAPACITOR THROUGH A PHOTOTUBE WHICH IS EXPOSED TO THE LIGHTING UTILIZED SO THAT THE DISCHARGE OF THE CAPACITOR THROUGH THE PHOTOTUBE IS DEPENDENT UPON THE LIGHT INTENSITY. THE DISCHARGE OF THE CAPACITOR IS MONITORED AND WHEN THE CAPACITOR HAS DISCHARGED TO A PREDETERMINED VALUE, THE LIGHTING IS TERMINATED TO COMPLETE THE CYCLE. MEANS ARE PROVIDED TO PRESET THE TIMING CYCLE FOR ALL LIGHTING NORMALLY UTILIZED IN HIGH PRODUCTION PHOTOGRAPHIC PROCESSES AS WELL AS MEANS FOR CONVERTING THE CIRCUIT FOR COLOR WORK. IN THE LATTER CASE DIFFERENT EXPOSURE AND DENSITY VALUES FOR EACH OF THE VARIOUS COLORS CAN BE PRESELECTED BEFORE THE CIRCUIT IS INITIALLY ENERGIZED. THE APPARATUS MAY ALSO INCLUDE A MECHANICAL COMPUTER WHICH ALLOWS DENSITY READINGS TO BE FED INTO THE DIALS AND AUTOMATICALLY CALCULATES AND ENTERS ADDITIONAL COMPENSATING VALUES OF DENSITY.

Inventors

• 👤 George Pamlenyi

Bibliographic Details