High density compact disc

Details High density compact disc High density compact disc

1996-07-30

1998-08-25

Huber, Paul W.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692575, G11B 370

Patent

active

057990077

ABSTRACT:
A high density compact disc having tracks for recording large amounts of information reproducible for a long interval of time is disclosed. In order to increase the track density, a recording surface on a substrate is divided into grooves and lands to thereby form tracks, and pits representing information signals are arranged in both the grooves and the lands. Here, the groove is formed at an optimized predetermined depth, depending on the wavelength of light used to read the information recorded on the disc and the refractive index of a disc substrate, to thereby reduce crosstalk caused by pits of an adjacent groove or land during reproduction. Accordingly, the present invention is effective in enhancing the practicality of the compact disc as a medium for preserving large amounts of information.

REFERENCES:
patent: 5031162 (1991-07-01), Morimoto et al.
patent: 5608710 (1997-03-01), Minemura et al.
patent: 5610879 (1997-03-01), Moriya et al.

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