Apparatus and method for reproducing information recored on an o

Details Apparatus and method for reproducing information recored on an o Apparatus and method for reproducing information recored on an o

1996-07-25

1998-06-02

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

3692751, 3692754, 369124, G11B 7095

Patent

active

057611750

ABSTRACT:
An apparatus for reproducing information recorded on an optical recording medium comprising a substrate on which a series of pits which have depth of 2.sup.N (N is an integer equal to or more than 2) steps are formed and a reflecting layer formed on the substrate to cover the series of pits. The apparatus includes a light source, a light detecting means for detecting light reflected from the optical recording medium and obtaining a read-out signal, and a level detecting circuit for detecting multiple levels corresponding to the level of the read-out signal by comparing the read-out signal with multiple level detecting windows. The width of the window is set wide at a lower signal level and the width of the window is set narrow at a higher signal level.

REFERENCES:
patent: 5144552 (1992-09-01), Abe
patent: 5463609 (1995-10-01), Inagaki et al.
patent: 5471455 (1995-11-01), Jabr

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