Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1998-04-14
1999-03-02
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4426, 369 4429, 369 4435, G11B 709
Patent
active
058780084
ABSTRACT:
An optical recording/reproducing method and apparatus using an optical recording medium in which grooves and lands are formed on a substrate, information recording areas are formed in association with both the groove and land, and having a flat address area. First and second address pits are disposed in the address area and satisfy predetermined requirements. An optical spot is irradiated on the optical recording medium and a reflected beam from the optical recording medium is detected which includes detection of an address pit so as to form an address pit readout signal. An address is detected on the basis of the address pit readout signal, wherein an amplitude of a first readout signal obtained from the first address pit is sampled and held and compared with an amplitude of a second readout signal obtained from the second address pit, which is sampled and held. The irradiation position of the optical spot is controlled in accordance with a result of the comparison.
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Minemura Hiroyuki
Miyamoto Harukazu
Sugiyama Hisataka
Hitachi , Ltd.
Tran Thang V.
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