Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1998-05-19
2000-07-11
Edun, Muhammad
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 47, 369 58, 369 60, G11B 700
Patent
active
060883154
ABSTRACT:
A motor rotation control circuit of a disc recording and/or reproducing apparatus has first and second rotation control units and a switching circuit. Information extracted from data read out from a disc is supplied to the first rotation control unit. The first rotation control unit forms a first control signal to rotate a disc rotating motor at a constant linear velocity. A signal indicative of the detection of the rotation of the motor to rotate, the disc is supplied to the second rotation control unit. The second rotation control unit forms a second control signal to rotate the motor at a constant angular velocity. The second rotation control unit fetches rotational speed information of the disc when switching from the first rotation control unit to the second rotation control unit and forms the second control signal to control the motor on the basis of the fetched rotational speed information of the disc when switched from the first rotation control unit to the second rotation control unit. The switching circuit switches the first and second control signals on the basis of a switching signal which is supplied from the controller and outputs the switched control signal. The switching circuit generates the first control signal from the first rotation control unit while the data is read out from the disc and generates the second control signal from the second rotation control unit while the reading operation of the data from the disc is stopped.
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patent: 5408478 (1995-04-01), Ohmori et al.
patent: 5412629 (1995-05-01), Shirane
patent: 5521895 (1996-05-01), Muira et al.
patent: 5559769 (1996-09-01), Ando et al.
patent: 5703854 (1997-12-01), Kuroda et al.
Edun Muhammad
Sony Corporation
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