| 摘要 |
1,018,933. Electrophotographic processes. GENERAL ELECTRIC CO. Dec. 29,1961 [Dec. 29, 1960], No. 40102/65. Divided out of 1,018,931. Heading G2H. Information in the form of a pattern of electromagnetic radiation is recorded on a photoconductive thermoplastic medium by applying a uniform electrostatic charge to the medium, producing a pattern of electromagnetic radiation representing the information on the charged medium and heating the medium so that it deforms according to the pattern of charges thereon. The uniformly charged medium may be selectively discharged in strips before exposure and the information on the deformed medium may be read by means of a Schlieren system. As shown, a heat-deformable photoconductive thermoplastic tape 1 is passed under corona discharge 6 of 7500 to 8500 volts and the uniformly charged tape is passed under grid 16 and ultra-violet lamp 12 to discharge the tape into strips. The tape then is exposed to transparency 13 by lamp 12, the tape being grounded by metal rollers 15 on an electrically conductive layer 20 and an electrically insulating support 21. The latent image charge pattern is developed by passing the tape 1 through a heating station 22 comprising electrodes 23 and 24 energized by highfrequency voltage deforming the tape in the charged areas. After heating the tape passes a phase contrast microscope 27 so that the deformations can be studied. The information on the tape is retrieved by a flying spot scanner 32, the spot being projected through the deformed storage medium on to a Schlieren optical system and a photo-cell 35 which produces electrical signals corresponding to the deformations. Alternatively, the charged tape may be electrically grounded after exposure and before heating. Other electromagnetic radiation such as visible light, X-rays, and gamma rays may be used. The thermoplastic photoconductive medium used may be that described in Specification 1,018,932 and the apparatus may be that of Specification 1,018,931. |
