Optical information recording medium and a reproducing apparatus

Details Optical information recording medium and a reproducing apparatus Optical information recording medium and a reproducing apparatus

1993-03-03

1995-01-03

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, 369124, G11B 726, G11B 1118

Patent

active

053792882

ABSTRACT:
An optical information recording medium, to and from which information can be recorded or reproduced at a high density, uses more number of kinds of pits than those of a conventional optical disc. A reproducing apparatus for such a medium also is devised. Information is recorded onto the recording medium by using a plurality of pit lengths which are obtained by dividing a whole frequency band below a cut-off frequency of MTF characteristic of a reproducing system into a plurality of bands in correspondence to the band characteristic and by allocating a plurality of spatial frequencies to the divided bands. The reproducing apparatus of the invention comprises an optical pickup to read out the recording information from the optical recording medium and signal demodulating means for demodulating the original data from the pulse width and amplitude value of the reproduction signal which is supplied from the optical pickup, wherein the optical pickup is designed to have an MTF characteristic such as to have one or a plurality of peaks at certain frequency positions.

REFERENCES:
patent: 4118734 (1978-10-01), Bouwhuis et al.
patent: 4475183 (1984-10-01), Marchant et al.
patent: 4477891 (1984-10-01), Gorog
patent: 5045868 (1991-09-01), Tajima
patent: 5283778 (1994-02-01), Maeda
Patent Abstracts of Japan vol. 9, No. 214 (P-384) Aug. 1985 (JPA 60-074 123).
Patent Abstracts of Japan vol. 5, No. 113 (P-089) Nov. 13, 1981 (JPA 56-107 308).

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