Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1994-08-11
1995-06-20
Neyzari, Ali
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369288, 428694SC, 428694MM, G11B 370
Patent
active
054266327
ABSTRACT:
An optical information recording medium recordable of the analogue NTSC color video signal under the conditions of a high S/N ratio and a low jitter, and capable of being played by a commercially available LD player. The medium comprises: a transparent substrate on which pre-grooves are formed with a depth of 1450-2050 angstroms; an optical absorbing layer with an absorbance of 0.7-0.9 made of palladium phthalocyanine dye formed on the substrate, the absorbing layer having pits each having a changed reflectivity being duty-cycle modulated in response to a limited waveform which is formed through the steps of: adding at least one of a second FM carrier and a third pulse carrier to a first FM carrier having a first center frequency and a first frequency band, the second FM carrier having a second center frequency lower than the first center frequency and a second frequency band spaced from the first frequency band, the third pulse carrier having a pulse-repetition frequency lower than the second center frequency and a third frequency band spaced from the second frequency band, to form a frequency-division multiplex signal; and symmetrically clipping the multiplex signal to form the limited waveform; and reflecting layer formed on the optical absorbing layer.
REFERENCES:
patent: 5075146 (1991-12-01), Satake et al.
patent: 5200947 (1993-04-01), Satake et al.
Ito Hiroshi
Murakami Shigenori
Ogasawara Kiyohide
Suzuki Kenji
Takishita Toshihiko
Neyzari Ali
Pioneer Electronic Corporation
Pioneer Video Corporation
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