Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1986-12-08
1987-11-17
Cardillo, Raymond F.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 46, 369105, 369275, 358342, G11B 709, G11B 7095
Patent
active
047078162
ABSTRACT:
A composite wobbled tracking servo system uses a rotary optical disc which has a header field and a data field alternately arranged along the direction of rotation, and which includes pregrooves formed in at least the data field and at least one pair of wobbled track marks disposed in each of the header fields in a relation wobbled relative to the center of a track. A light spot is directed toward and onto the optical disc to detect a push-pull tracking error signal from the reflection of the light spot diffracted from the pregroove, and a wobbled tracking error signal is detected from the reflection of the light spot passing the wobbled track marks. After attenuating the gain of the wobbled tracking error signal by a low-pass filter so that the gain of the wobbled tracking error signal becomes equal to that of the push-pull tracking error signal at a frequency fe satisfying the relation
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Ichino Kazuo
Ito Masaru
Nakagaki Harushige
Ohtake Masatoshi
Tsuyoshi Toshiaki
Cardillo Raymond F.
Hitachi , Ltd.
Young Wayne R.
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