24-10-1972 дата публикации
Номер: US3700439A
A PHOTOCOPY PROCESS AND PHOTOSENSITIVE SHEETS FOR USE THEREIN, WHEREIN A SUBSTRATE SHEET IS MADE SENSITIVE TO ULTRAVIOLET LIGHT BY A COATING OF MICRO-FINE LIQUID DROPLETS, RANDOMLY, EVENLY AND CLOSELY DISTRIBUTED ON A SURFACE OF THE SUBSTRATE SHEET, AND HELD IN ISOLATION FROM EACH OTHER AND FROM THE SHEET AND ITS ENVIRONMENT BY ULTRAVIOLETTRANSMITTING, ORGANIC, POLYMERIC, HYDROPHILIC, FILM-FORMING MATERIAL, SAID LIQUID BEING AN ORGANIC, LIQUID SOLUTION OF A COLORLESS DYE-PRECURSOR WHICH YIELDS A COLORLESS, ACIDCOLORABLE DYE WHEN IRRADIATED WITH ULTRAVIOLET LIGHT. PATTERNED IRRADIATION OF THE COATED SURFACE OF THE SUBSTRATE SHEET, AS BY THE USE OF A PATTERNED MASKING DEVICE, PRODUCES A PATTERNED LATENT IMAGE OF COLORLESS, BUT NOW ACIDCOLORABLE, DYE DROPLETS, AGINST A BACKGROUND OF COLORLESS DYE-PRECURSOR DROPLETS. SUBSEQUENT APPLICATION OF PRESSURE TO THE SUBSTRATE RUPTURES THE ISOLATING FILM AND EXPOSES THE LIQUID DROPLETS OF DYE AND DYE-PRECURSOR MATERIAL FOR DEVELOPMENT OF COLOR IN THE DYE BY CONTACT WITH ACID.
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