Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1984-04-12
1990-05-08
Faber, Alan
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4411, 250202, G11B 712, G11B 709
Patent
active
049244558
ABSTRACT:
A tracking servo signal is generated for use in an optical disc pick-up system, being particularly advantageous for use when the depth of the pits is greater or less than one-fourth the wavelength of the light beam used to read the disc, in which case diffraction patterns formed by reflected light beams are not symmetric on a photo-detector and typically result in DC-shifted tracking error signals. A first tracking error signal is generated from selected output signals of a number of light-receiving areas of the photo-detector and a second tracking error signal is generated by combining output signals from these light-receiving areas in a pattern different than that used in generating the first tracking error signal. These two tracking error signals are combined so that the resultant signal forms a tracking servo signal that has substantially no DC component.
REFERENCES:
patent: 4011400 (1977-03-01), Simons et al.
patent: 4059841 (1977-11-01), Bricot et al.
patent: 4268745 (1981-05-01), Okano
patent: 4273998 (1981-06-01), Kanamaru
patent: 4290132 (1981-09-01), Kotaka
patent: 4293944 (1981-10-01), Izumita et al.
patent: 4410969 (1983-10-01), Maeda
patent: 4467462 (1984-08-01), Shibata
patent: 4501493 (1985-02-01), Kubota
patent: 4525825 (1985-06-01), Ito et al.
patent: 4541082 (1985-09-01), Horikoshi et al.
patent: 4541084 (1985-09-01), Oku et al.
patent: 4542491 (1985-09-01), Takasugo et al.
Fujiie Kazuhiko
Nonaka Chiaki
Yoshida Tadao
Eslinger Lewis H.
Faber Alan
Maioli Jay H.
Sony Corporation
Tomassini James E.
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