Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1995-06-08
1997-05-06
Young, W. R.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 47, G11B 700
Patent
active
056278110
ABSTRACT:
An optical disk apparatus includes a disk servo unit which generates a servo signal based on a data signal read from an optical disk. The servo signal is supplied to a disk motor to control a rotation of the motor so that a linear velocity of the disk is kept constant when data is read from or written onto the disk. The disk servo unit is connected to the motor when the data is read from or written onto the disk, so that the servo signal is supplied to the motor, and the disk servo unit is disconnected from the motor when a pickup jumps from a present track of the disk to a destination track thereof so that the supply of the servo signal to the motor is inhibited. A velocity change signal which enables the motor to increase or decrease a rotating speed of the motor is generated depending on which one of two directions of the track jump is specified by a direction signal. A time signal which defines an estimated time of the track jump required to change an angular velocity at the present track to an angular velocity at the destination track is generated. The optical disk apparatus supplies the velocity change signal to the motor during the estimated time.
REFERENCES:
patent: 4783774 (1988-11-01), Enomoto
patent: 5010540 (1991-04-01), Fuji et al.
patent: 5093820 (1992-03-01), Maeda et al.
Shortley and Williams, "Elements of Physics"1953, pp. 156-157.
Aoyama Katsumi
Morita Tsutomu
Onda Hiroyuki
Tanaka Masasi
Teac Corporation
Tran Thang V.
Young W. R.
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