| 摘要 |
PURPOSE:To enable the recording of information having high S/N and capable of being reloaded by using different and uniform oriented states of a liq. crystal group in recording and erasing information. CONSTITUTION:A voltage is applied between transparent electrodes 3 and 5, an electric field is impressed on a high molecular liq. crystal 4 to heat the crystal to about 90 deg.C and the liq. crystal is oriented in the direction vertical to a glass substrate. Accordingly, an optical recording medium providing a dark field under crossed Nicols even when cooled is formed. Then when high- density energy light 7 is irradiated while rotating the optical recording medium 1 around the central axis without impressing a voltage between the electrodes 3 and 5, the high molecular liq. crystal at the irradiated part is oriented in the direction different from the initial orientation, namely in the direction parallel to the glass substrate, by the shearing stress due to the rotation and the information can be recorded by the bright field under crossed Nicols. The voltage is applied between the transparent electrodes 3 and 5, light is irradiated on the recorded part of the liq. crystal while impressing an electric field on the high molecular liq. crystal 4 to locally heat the part, hence the crystal is returned to the initial uniform orientation and the information is erased. |
