Optical record and reproduction apparatus with liquid crystal pa

Details Optical record and reproduction apparatus with liquid crystal pa Optical record and reproduction apparatus with liquid crystal pa

1991-05-30

1993-05-11

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

369 4412, 369 4414, 369109, 369110, G02F 11335, G11B 700

Patent

active

052106276

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.

REFERENCES:
patent: 4389096 (1983-06-01), Hori et al.
patent: 4733065 (1988-03-01), Hoshi et al.
patent: 4767194 (1988-08-01), Heppke et al.
patent: 4935913 (1990-06-01), Shinoda
patent: 4983002 (1991-01-01), Shikama et al.
patent: 4991160 (1991-02-01), Premji
patent: 4991919 (1991-02-01), Nishiwaki et al.
patent: 5062098 (1991-10-01), Hori et al.

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