Optical information reproducing system with a reading beam havin

Details Optical information reproducing system with a reading beam havin Optical information reproducing system with a reading beam havin

1995-05-15

1996-07-23

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

3692751, 369124, 369109, 3692754, G11B 724

Patent

active

055397220

ABSTRACT:
Disclosed is an optical disk having at least one pit in each of unit areas continuously provided in a circumferential direction of the disk, said pit having a depth of at least one of n depths (n: an integer equal to or greater than 2). Also disclosed is an information reproducing method of reproducing pit information from such an optical disk. This method comprises the steps of irradiating a read beam having frequency components of n wavelengths corresponding to four times the n depths to a row of the unit areas, and acquiring pit information based on an intensity distribution in a plane perpendicular to the optical axis of a reflected beam from the row of unit areas.

REFERENCES:
patent: 4674070 (1987-06-01), Tajima et al.
patent: 4896313 (1990-01-01), Hirose et al.
patent: 4963464 (1990-10-01), Setani
patent: 5065377 (1991-11-01), Spruit et al.
patent: 5235587 (1993-08-01), Bearden et al.
patent: 5295131 (1994-03-01), Ishibashi et al.
patent: 5375109 (1994-12-01), Morimoto et al.
patent: 5453969 (1995-09-01), Psaltis et al.
European Search Report, dated Jul. 22, 1993.

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