Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1989-12-11
1991-09-17
Trafton, David
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360114, 360 7703, 369 4426, 369 4429, 365122, G11B 1118, G11B 1100
Patent
active
050501445
ABSTRACT:
A magnetooptic disk has circumferentially-spaced-apart, radially-aligned embossed sector areas which indicate data storage tracks. The sector areas include embossed signals which indicate track-following information, and in a second area which trails the track-following information, track-seeking information is carried by the embossed signals. A magnetooptic coating covers the entire disk including the embossed sector areas. Readback clock synchronization signals are recorded over the track-seeking area to enable synchronizing a readback phase-locked loop such that more of the areas between sector areas can be used for recording data signals. During track seeking, the track seek controlling embossed signals are read using intensity demodulation, while in track following, during a readback, the clock signals recorded over the embossing are read for synchronizing the readback circuits. During recording, the synchronization signals are recorded over the embossed area dedicated to track seeking.
REFERENCES:
patent: 4151571 (1979-04-01), Cardot et al.
patent: 4424543 (1984-01-01), Lewis et al.
patent: 4428075 (1984-01-01), Hazel
patent: 4432082 (1984-02-01), Hsieh
patent: 4435797 (1984-03-01), Hsieh
patent: 4443870 (1984-04-01), Hazel
patent: 4455632 (1984-06-01), Braat
patent: 4636885 (1987-01-01), Yamada
patent: 4669003 (1987-05-01), Bell et al.
patent: 4669004 (1987-05-01), Moon et al.
patent: 4730289 (1988-03-01), Saitoh
patent: 4785167 (1988-11-01), Madrid
patent: 4785438 (1988-11-01), Mizunoe
patent: 4797868 (1989-01-01), Ando
patent: 4814903 (1989-03-01), Kulakowski et al.
patent: 4853923 (1989-08-01), Yamada
patent: 4978950 (1990-12-01), Capps
Henderson Ian E.
Tayefeh Morovat
International Business Machines - Corporation
Pokotylo John
Somermeyer H. F.
Trafton David
LandOfFree
Recording intensity modulated signals and polarization-modulated does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Recording intensity modulated signals and polarization-modulated, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recording intensity modulated signals and polarization-modulated will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1922795