Information detection of a phase-change type optical recording m

Details Information detection of a phase-change type optical recording m Information detection of a phase-change type optical recording m

1993-06-01

1995-01-10

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

3692752, 369107, G11B 700

Patent

active

053813952

ABSTRACT:
A signal information recorded on a recording layer formed on a phase-change type optical disk is reproduced as a phase change. Laser light emitted from a laser light source is collimated to a reference light by a lens. The reference light is divided by a beam splitter into a first reference light and a second reference light. The first reference light is directed through a condenser lens to the recording layer of the optical disk. A reflection light from the recording layer is directed through the beam splitter and a second condenser lens to an optical detector. The second reference light is passed through a phase difference plate, a reflection mirror, the phase difference plate, the beam splitter and then through the second condenser lens to the optical detector as a phase shifted reference light. At an input end of the optical detector, the reflection light and the phase-shifted reference light interfere with each other and the signal information having substantially no phase jitter is obtained at an output of the optical detector.

REFERENCES:
patent: 5025439 (1991-06-01), Komaki et al.
patent: 5084851 (1992-01-01), Noda et al.
patent: 5291470 (1994-03-01), Nishiuchi et al.

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