Optical disc having two-step pit structure and pickup apparatus

Details Optical disc having two-step pit structure and pickup apparatus Optical disc having two-step pit structure and pickup apparatus

1993-04-08

1994-08-16

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

3692751, 3692754, G11B 700

Patent

active

053393040

ABSTRACT:
An optical disc has a two-step pit structure in which first pits and second pits whose depth is a half of that of the first pits are arranged in superposition in the same track direction. A first laser diode emits first laser light having a first wavelength which is four times the depth of the first pits, and a second laser diode emits second laser light having a second wavelength which is four times the depth of the second pits. An optical system introduces the first and second laser light onto a recording surface of the optical disc, and also introduces reflected light to a detector. A selecting drive mechanism may be provided to select one of the first and second laser diodes as a light source for actually emitting light to be introduced onto the recording surface.

REFERENCES:
patent: 4161752 (1979-07-01), Basilico
patent: 4455632 (1984-06-01), Braat
patent: 4963464 (1990-10-01), Setani
patent: 5016240 (1991-05-01), Strandjord et al.
patent: 5144552 (1992-09-01), Abe
patent: 5168490 (1992-12-01), Braat
patent: 5204852 (1993-04-01), Nakagawa et al.
European Search Report, dated Jan. 11, 1993.

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