Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1992-08-27
1994-04-12
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4436, 369 4437, G11B 709
Patent
active
053032160
ABSTRACT:
An optical recording and reproducing apparatus uses a laser to form one or more spots on an information recording medium preformatted with wobbling guide grooves, and detects tracking error. If the differential push-pull method of detecting tracking error is used, a center spot is flanked by satellite spots distant by an odd multiple of half the repeating period of the wobble. If the three-beam method is used, the distance is an odd multiple of one-fourth the repeating period of the wobble. If the push-pull method is used, a split photodetector generates a pair of electrical signals. The sum and difference of these signals are filtered, then synchronously detected, and the result is combined with the difference signal to generate a corrected tracking error signal.
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"Principles of Optical Disc Systems", pp. 70-75, G. Bouwhuis et al., (1985).
"Write-once Type CD Recorder with Swing Head", Masafumi Naitoh et al., vol. 44, No. 10, pp. 1403-1409, (1990).
"A new tracking servo method: Differential Push-Pull method", Ohsato, pp. 127-132, Dec. 17-19, 1986.
"MO Disk Recorder for Industrial Applications", Yokota et al., pp. 166-169, Oct. 15-17, 1990.
Patent Abstracts of Japan, vol. 13, No. 460, (P-946), Oct. 18, 1989 & JPOI-179232.
Ito Takeshi
Kime Kenjiro
Matozaki Toshiya
Nakamura Keiji
Shinoda Masahisa
Mitsubishi Denki & Kabushiki Kaisha
Young W. R.
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