| 摘要 |
1,210,727. Electrostatic recording media. CLEVITE CORP. 4 Dec., 1968 [29 Dec., 1967], No. 57563/68. Heading B2E. An electrostatic record medium, for placing with a first side of said medium adjacent a surface of a charging head for reflecting electrostatic recording on the medium comprises a conductive base layer, a dielectric layer covering one side of the conductive base layer and presenting a substantially flat dielectric surface for receiving and retaining charge from the charging head, and a number of projections out of the plane of the dielectric surface to establish, during electrostatic recording, a gap of substantially uniform length between the dielectric surface and the surface of the charging bead. The conductive base may be paper coated and/or impregnated with an ionic conductor, a carbon filled paper or a sheet of paper having carbon filled coating. The dielectric layer may be of polyvinyl acetate, polystyrene, polyvinyl butyral or polymethyl methacrylate. The dielectric layer may be of thickness 0.1 to 0.3 mils. The projections may ,be formed integrally with the dielectric layer, or may be granular particles affixed or embedded in to the surface of the dielectric layer. Suitable granular particles are glass shot, crude hard wax emulsion, corn starch, refractory material or plastics material such as polyethylene. A conductive material such as aluminium powder or zinc dust may be employed which do not contact the conductive surface below.
|
