| 摘要 |
PURPOSE:To increase recording density by providing a polarizing plate and a lower high- reflection-factor electrode to one ferroelectric liquid crystal layer and a transparent photoconductive layer to the other, laminating an upper transparent electrode and a polarizing plate which are divided into two areas on the photoconductive layer, and providing those electrodes with a simultaneous/individual voltage applying means. CONSTITUTION:When information is recorded, a recording voltage source 20 for voltage application has its positive electrode connected to the upper transparent electrode 15 and its negative electrode connected to the lower high-reflection-factor electrode 18. The place where the information is recorded is irradiated with a laser light beam which is intense enough for the recording by a semiconductor laser 4, then the photoconductive layer 16 in the area conducts to apply an electric field to ferroelectric liquid crystal; and this orientation state is maintained even after the semiconductor laser light is ceased, and the information is recorded. In the area where the information is recorded, the plane of polarization of light which becomes linear polarized light is rotated by the polarizing plate 14, so light reflected by the lower high-reflection-factor electrode 18 passes through the polarizing plate 14 again and returns to a photosensor 7 and the quantity of the light is larger than that in an erasure state, so that the information is readable. The information is erased almost in the opposite order. |
