Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-10-15
2000-03-28
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, 369 4426, 369 4435, G11B 700
Patent
active
06044049&
ABSTRACT:
An optical information apparatus for performing at least one of a reproduction operation and a recording operation for an information medium by radiating a light beam on the information medium is provided, wherein the information medium has a first region, including a first track having information recorded thereon in the form of convex and concave pits, and a second region, including a second track formed in the form of convex and concave guide grooves. The apparatus includes: first tracking error detection component for detecting an error in position between the light beam and the first track in the first region; second tracking error detection component for detecting an error in position between the light beam and the second track in the second region; tracking control component for performing tracking control for locating the light beam on a predetermined track; determination component for determining whether the light beam is located in the first region or the second region; and switching component for selecting either one of an output signal of the first tracking error detection component or an output signal of the second tracking error detection component based on a result of determination by the determination component, and sending the selected output signal to the tracking control component.
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Fujiune Kenji
Moriya Mitsuro
Watanabe Katsuya
Yamada Shin-ichi
Yamaguchi Hiroyuki
Kelly Michael K.
Matsushita Electric - Industrial Co., Ltd.
Tran Thang V.
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