Optical disc having large display patterns and its manufacturing

Details Optical disc having large display patterns and its manufacturing Optical disc having large display patterns and its manufacturing

1995-12-19

1998-05-05

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369274, G11B 724, G11B 370

Patent

active

057486077

ABSTRACT:
An optical disk having both recording surfaces on which are formed pits trains. A recognizable display pattern is formed by a group of dummy pits formed on one of the recording surfaces. An apparatus for manufacturing the optical disk in which a light beam is modulated in accordance with a dummy forming signal obtained by selectively stopping a dummy pulse, and the modulated light beam is irradiated to a resist layer formed on a recording surface of a disk to form a group of dummy pits representing a display pattern.

REFERENCES:
patent: 3689078 (1972-09-01), Ban
patent: 4967286 (1990-10-01), Nomula et al.
patent: 5398231 (1995-03-01), Shin et al.
patent: 5608717 (1997-03-01), Ito et al.
patent: 5608718 (1997-03-01), Schiewe

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