Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1994-09-06
1995-08-22
Epps, Georgia Y.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4426, G11B 586
Patent
active
054446821
ABSTRACT:
In a tracking control apparatus of a recording and reproducing apparatus for an optical disk, information is recorded in groove tracks and land tracks of the optical disk and address information is recorded in an address area arranged to each of the groove tracks and the land tracks, a control signal corresponding to a positional deviation between a light beam spot and a track is derived on the basis of light reflected from the optical disk, and hence an address period in which the light beam spot traces the address area is derived. When the light beam spot traces the land track, a tracking operation is performed by a control signal which is invert in polarity to that of groove track, and when the light beam spot traces the address area, the tracking control is performed by a signal of the same polarity as that of the groove track.
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Kanda Yoshihiro
Matsumoto Yasuki
Moriya Mitsurou
Yamada Shin-ichi
Yamaguchi Hiroyuki
Dinh Tan
Epps Georgia Y.
Matsushita Electric - Industrial Co., Ltd.
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