Optical recording and reproducing apparatus using a hologram to

Details Optical recording and reproducing apparatus using a hologram to Optical recording and reproducing apparatus using a hologram to

1993-12-08

1996-01-09

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, 369 58, 369106, 369110, 369111, 369112, G11B 709

Patent

active

054835089

ABSTRACT:
An optical recording and reproducing apparatus records two rows of a plurality of pit patterns with respect to one track by modulating two light beams and by converging the modulated two light beams in parallel onto the track. The plurality of pit patterns are detected and judged by a multiple hologram on which reflected object waves of all kinds of pit patterns are recorded, thereby enabling to carry out recording of information. With the arrangement, since multiple values recording and reproducing can be carried out with respect to a magneto-optical disk, the recording capacity becomes greater than the conventional case and the reproduced signal having little crosstalk can be obtained according to the present way of reproducing.

REFERENCES:
patent: 4868820 (1989-09-01), Nagashima et al.
patent: 5070495 (1991-12-01), Bletscher, Jr. et al.

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