Method of reproducing information by optically scanning marks on

Details Method of reproducing information by optically scanning marks on Method of reproducing information by optically scanning marks on

1991-03-12

1993-07-06

Young, W. R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369111, G11B 700

Patent

active

052260313

ABSTRACT:
A method of reproducing optical information by utilizing an optical information recording medium is disclosed, in which a timing mark is formed on each information track in the recording medium; an information mark is formed on each information track with a predetermined cycle at a predetermined distance from the timing mark, which is a starting point of the information mark; comprising the steps of (a) scanning the information track at a specified scanning speed using a light spot; (b) detecting physical changes caused by the timing marks and information marks in the light reflected or transmitted from the optical information recording medium; and (c) reproducing the optical information by determining the presence or absence of an information mark by performing particular calculations as described in the specification.

REFERENCES:
patent: 4646281 (1987-02-01), Verboom
patent: 4831613 (1989-05-01), Kanda
patent: 5084858 (1992-01-01), Maeda
patent: 5117412 (1992-05-01), Ito et al.

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