Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1987-03-31
1989-05-30
Beha, Jr., William H.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369109, 369111, 369275, G11B 7095
Patent
active
048357561
ABSTRACT:
An optical memory apparatus employs an optical disc having a plurality of guide-grooves in spiral and concentrical form and a plurality of flat tracks each arranged between adjacent two of the guide-grooves for recording information thereon, and the depth of the guide-grooves is suitably selected to increase the degree of modulation of a track cross signal, thereby performing a stable cross track counting by the use of the track cross signal and a tracking signal. One feature of the invention relies in that the modulation degree of the track cross signal is in the range between 30 and 60%. A second feature of the invention is that the guide-grooves are formed into a V shape and have an optical depth of .lambda./6 to .lambda./5 (.lambda. is the wavelength of the light used). In accordance with the invention, not ony a stable cross track counting is realized, but also the tracking signal is not practically varied with variations in the depth of the guide-grooves, thereby ensuring a highly accurate and stable tracking control.
REFERENCES:
patent: 3931459 (1976-01-01), Korpel
patent: 4517668 (1985-05-01), Takaoka et al.
patent: 4587648 (1986-05-01), Ando
patent: 4607358 (1986-08-01), Maeda et al.
patent: 4730294 (1988-03-01), Funada
patent: 4731771 (1988-03-01), Maeda et al.
patent: 4744070 (1988-05-01), Takemura et al.
Ito Masaru
Kaku Toshimitsu
Maeda Takeshi
Nakamura Shigeru
Shigematsu Kazuo
Beha Jr. William H.
Hitachi , Ltd.
LandOfFree
Optical memory apparatus using an optical disc having guide-groo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical memory apparatus using an optical disc having guide-groo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical memory apparatus using an optical disc having guide-groo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2159092