| 摘要 |
PURPOSE:To prevent defective contact of an acicular body with the surface of a plate- shape body and enhance durability of a heat generating plate, by providing a surface energization layer having a volume resistance of not more than 10<-2>OMEGA-cm on one side of an electrically anisotropic plate-shaped body. CONSTITUTION:An electrically anisotropic plate-shaped body comprises a multiplicity of acicular bodies of a conductive ceramic or metal having a volume resistance of not more than 10<5>OMEGA-cm dispersed in a matrix of a nonconductive ceramic having a volume resistance of at least 10<6>OMEGA-cm, with the longitudinal direction of the acicular bodies oriented in the thickness direction of the plate-shaped body. A surface energization layer comprising a conductive material having a surface resistance of not more than 5OMEGA and a volume resistance of not more than 10<-2>OMEGA-cm and being insusceptible to discharge breakdown at the time of electrothermorecording is provided on one side of the plate-shaped body. An electric heat generating layer comprising a conductive inorganic material and having a surface resistance of 10-10<7>OMEGA is provided on the other side of the plate-shaped body. Further, a conductive layer comprising a thin metallic film or conductive ceramic having a surface resistance of not more than 50OMEGA and lower than the surface resistance of the heat generating layer is provided on the heat generating layer side. The thickness of the surface energization layer is set at 0.05-5mum. |
