Optical record and reproduction apparatus with liquid crystal panel that rotates light followed by a polarizer or birefringent plate
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United States of America Patent
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May 11, 1993
Grant Date -
N/A
app pub date -
May 30, 1991
filing date -
May 31, 1990
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Abstract
An optical record and reproduction apparatus, in which a light beam generated by a light source is concentrated onto an information recording medium by a focusing device, and the light beam reflected by the information recording medium is detected by a light detector to obtain a tracking error signal. A liquid crystal panel having a transparent electrode aligned in a striped form and a polarizing plate or birefringent phase difference plate constitute a beam divider for obtaining a main beam and supplementary beams without any accompanying mechanical movement. The beam divider is arranged between the light source and the focusing device. By selectively applying a voltage to the transparent electrode, the liquid crystal panel is made to function in the same manner as a diffraction grating. Another transparent electrode aligned in a striped form at an inclined angle may also be provided.
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