Apparatus and method for recording and reproducing multi-level i

Details Apparatus and method for recording and reproducing multi-level i Apparatus and method for recording and reproducing multi-level i

1989-12-22

1992-09-01

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

346 76L, G11B 700

Patent

active

051446154

ABSTRACT:
An information recording apparatus includes a record signal analog processor which converts information to be recorded into an analog signal having a plurality of levels, a laser beam source for emitting a laser beam whose energy and radiating time are modulated at multiple levels in accordance with the analog signal, and an optical system for directing the laser beam on an information recording medium. The information recording medium has a recording layer. As a result of the modulation of the laser energy, a plurality of states of recording marks are obtained. As a result of the modulation of the laser radiating time, a plurality of lengths of recording marks are obtained in the radiated portion. Thus, multi-level information is recorded in the data recording medium. The recorded information can be reproduced by detecting the optical characteristics of these recording marks.

REFERENCES:
patent: 4825408 (1989-04-01), Potember

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