Recorder with electrically conductive paper

• Main Author: PETERSON, DEAN M
• Format: Patent
• Language: English
• Published: 04.12.1979
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; AUXILIARY PROCESSES IN PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES; PHOTOGRAPHY; PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHYSICS; TARIFF METERING APPARATUS; TESTING

A recorder using a carbon backed "self-developing" dry silver recording medium which is guided over a recording and developing path includes a pair of rollers one of which is connected to a ground potential and the other to a positive potential with the electrically conducting carbon coated side of the recording medium arranged to contact both of the rollers to enable electrical current to pass through the carbon backing to generate the heat required to develop the recording thereon. A third roller is arranged to contact the recording medium on the recording side and to press the carbon coated side against a second location on the ground roller to provide a second current conducting path between the positive potential roller and the ground roller. The electrical current is controlled in accordance with the speed of the recording medium to insure a proper developing time relationship at different recording medium speeds.