| 摘要 |
PURPOSE:To easily save and rewrite image information and to obtain sharp characters with good contrast by using liquid crystal which has thermo-optic effect as a recording medium and recording an image by the thermo-optic effect. CONSTITUTION:Aniline black is vapor-deposited on the inside surface of a substrate 3, the internal surfaces of substrates 1 and 3 are oriented vertically, and the liquid crystal 2 which has smectic A phase at room temperatures is injected and sealed to obtain a liquid-crystal element 4. When this liquid-crystal element 4 is applied with an electric field having electric field effect 40V/20mum, the liquid-crystal layer becomes transparent an the display surface of the liquid- crystal element 4 becomes black. Then, impulsive heat application of about 2J/cm<2> is carried out by a thermal head 7 to write characters, so that sharp characters appear in white on the black ground. Further, when copper phthalocyanine or permanent red F5R is used as said vapor-deposited material on the substrate 3, sharp white characters are obtained on a blue ground by the former or on a red ground by the latter. |
