Reproducing system for an optical disc

Details Reproducing system for an optical disc Reproducing system for an optical disc

1993-10-20

1995-07-04

Popek, Joseph A.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369 4441, 369109, 369120, G11B 700

Patent

active

054307040

ABSTRACT:
An optical disc has recorded information and is irradiated with a laser beam at a first spot for reading information recorded on the disc and at a second spot. The second spot has such an area that intensity of light reflected at the second spot does not change with change of the recorded information. A first photodetector is provided for detecting intensity of light reflected on the first spot, and a second photodetector is provided for detecting intensity of light reflected on the second spot. A subtracter is provided for producing the difference between outputs of the first photodetector and the second photodetector and an alternating current detector is provided for producing an output at a slice level where the difference of the subtracter becomes zero.

REFERENCES:
patent: 4831609 (1989-05-01), Suzuki
patent: 5090004 (1992-02-01), Ohsato
patent: 5153863 (1992-10-01), Noda
patent: 5253238 (1993-10-01), Shimonou

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