Split photo detector for detecting a central portion and a perip

Details Split photo detector for detecting a central portion and a perip Split photo detector for detecting a central portion and a perip

1995-09-27

1998-06-30

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369 4432, 369 4441, 369120, G11B 712

Patent

active

057744440

ABSTRACT:
An optical information reproducing method, for optically reproducing information recorded on a recording medium, irradiates the recording medium with a laser beam and detects the light returning from the recording medium. When the diffracted light returning from the recording medium is detected, the optical intensity distribution of the diffracted light is detected by a plurality of detectors to produce a plurality of signals, and the signals are calculated to produce a reproduced signal for detecting the information.

REFERENCES:
patent: 5121378 (1992-06-01), Hirose et al.
patent: 5283778 (1994-02-01), Maeda
patent: 5347509 (1994-09-01), Goldberg et al.
patent: 5396478 (1995-03-01), Krantz
patent: 5434840 (1995-07-01), Ezuka et al.
patent: 5491678 (1996-02-01), Maeda et al.
patent: 5548576 (1996-08-01), Matsumoto et al.

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