| 摘要 |
PURPOSE:To make the readout speed of information higher without necessitating mechanical rotation by reproducing the information recorded by the oriented state of the liquid crystal molecule of a high polymer liquid crystal layer only by optical and electric processing. CONSTITUTION:Polarizing beam splitters 8 and 9 are arranged in a state where incident surfaces mutually form the angle of 45 deg. around an optical axis with respect to reflected light from a recording medium 6, and transmit or reflect the reflected light from the recording medium with the respective polarizing characteristics so that the light beams are respectively received by photodetectors 11-14. The light receiving signals of the photodetectors 11-14 are inputted in the respective input terminals of subtraction circuits 15 and 16, and the circuits 15 and 16 output a difference between the inputted signals. The phases of the output of the circuits 15 and 16 are shifted by 45 deg.. Based on the output, a reproducing signal corresponding to the oriented state of the liquid crystal molecule is generated. Thus, the information is reproduced at a high speed without necessitating the mechanical rotation. |
