Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1992-01-16
1994-12-20
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4428, 369 4441, 369116, 369112, G11B 7085
Patent
active
053751094
ABSTRACT:
The two sets of data stored in pits and a magneto-optical layer of an optical recording/reproducing device can be read separately by the use of two lasers. The laser which reads/records the data stored in the pits operates at a wavelength .lambda..sub.1 approximately four times the depth of the pits. The laser which reads/records the data stored in the magneto-optical layer operates at a wavelength .lambda..sub.2 approximately twice the depth of the pits. The wavelength of the laser which reads the magneto-optical layer is adjusted and interference between the two signals is avoided.
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Nakamura et al, "Compact two-beam head with a hybrid two-wavelength laser array for magneto-optic recording" Japanese Journal of Applied Physics, Supplements, vol. 26, No. 26-4, 1987, Tokyo Japan, pp. 117-120.
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Morimoto Yasuaki
Zucker Friedhelm
Deutsche Thomson-Brandt GmbH
Edun Muhammad
Herrmann Eric P.
Kurdyla Ronald H.
Tripoli Joseph S.
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