Optical disk and method of tracking the same

Details Optical disk and method of tracking the same Optical disk and method of tracking the same

1985-05-03

1988-05-10

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 250202, G11B 7095

Patent

active

047440708

ABSTRACT:
An optical disk having V-shaped grooves with depths periodically varied at a frequency f for every two grooves, thus realizing a large recording area on each slant of the grooves. A tracking method for the optical disk in which two laser spots irradiate two adjoining slants of a V-shape groove, and pilot signals are made of components of the frequency f which are detected from the reflected beams of the respective two laser spots on the optical disk, and whereby the tracking is performed by controlling so as to make the magnitudes of the two pilot signals become equal to each other.

REFERENCES:
patent: 3876842 (1975-04-01), Bourhuis
patent: 3999008 (1976-12-01), Bourhuis
patent: 4310916 (1982-01-01), Dil
patent: 4325135 (1982-04-01), Dil
patent: 4534021 (1985-08-01), Smith
patent: 4569038 (1986-02-01), Nagashima
"Proc. of ICO 13", Sapporo (1984).

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