Information recording media and optical disk, disk having specif

Details Information recording media and optical disk, disk having specif Information recording media and optical disk, disk having specif

1995-04-12

1998-05-12

Font, Frank G.

Dynamic information storage or retrieval

Simultaneous diverse types of storage or retrieval

370273, 370 84, 360 15, 3647866, 380 4, 380 25, G11B 1300, G11B 586, H04L 900

Patent

active

057516715

ABSTRACT:
A character and/or graphics pattern area for recording specific data is provided on a CD-ROM. When an original disk is prepared, a specific pit pattern corresponding to the specific data is recorded at a first predetermined tracking linear velocity controlled by a specific tracking linear velocity control system for each track so that a character and/or graphics pattern cannot be identified. When a copy disk is produced from the original disk, if data is recorded at a second tracking linear velocity controlled by a specific tracking linear velocity control system, the character and/or graphics pattern of visible size appears on the copy disk because of an optical reflection factor difference between areas caused by placement of the specific pit pattern corresponding to the specific data.

REFERENCES:
patent: 4677604 (1987-06-01), Selby et al.
patent: 4872151 (1989-10-01), Smith
patent: 4967286 (1990-10-01), Nomula et al.
patent: 5136560 (1992-08-01), Hangai et al.
patent: 5138604 (1992-08-01), Umeda et al.
patent: 5398231 (1995-03-01), Shin et al.
patent: 5452282 (1995-09-01), Abraham

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