Optical pickup, optical information recording carrier and record

Details Optical pickup, optical information recording carrier and record Optical pickup, optical information recording carrier and record

1991-01-03

1992-12-15

Weinhardt, Robert

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

385 33, 359328, 369 4414, G11B 700, G02B 632

Patent

active

051723697

ABSTRACT:
An optical pickup using a fiber type SHG, an optical information recording carrier and an information recording and reproducing apparatus. In the optical pickup, the primary ray which was removed in conventional arrangements is utilized thereby the same pickup can be used not only for an optical disk of a high density but also for an optical disk of a usual record density. To raise the recording density of the information recording carrier the laminated structure is utilized to record information. Two rays having different wavelengths are directed onto the record layer and onto the recordable layer of the optical disk, and the information recording and reproducing apparatus performs the reproducing of information as well as error detection and record/reproduction of information, so that a novel reproduction mode is realized.

REFERENCES:
patent: 4626679 (1986-12-01), Kuwayama et al.
patent: 4771415 (1988-09-01), Taki
patent: 4892375 (1990-01-01), Chikuma et al.
patent: 5058981 (1991-10-01), Umegaki et al.
patent: 5072437 (1991-12-01), Chikuma

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