Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1992-10-28
1994-02-22
Young, W. R.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
358338, 360 7303, G11B 1924
Patent
active
052894487
ABSTRACT:
A rotation control apparatus provides servo control over a recording medium, which allows information signals to be read thereto or written therefrom. The apparatus is capable of effecting proper recording or reproduction even immediately after switching of modes. A motor imparts rotary motion to a recording medium; a pulse generator is arranged to detect the rotation of the recording medium and then to output a pulse of frequency proportional to the rotational speed of the recording medium; a servo circuit receives a reference pulse and the pulse output from the pulse generator and then controls the motor to rotate so that the phase difference between the reference pulse and the pulse output from the pulse generator is constant. An internal vertical synchronizing signal generating circuit having a reset terminal, is arranged to supply an internal vertical synchronizing signal of predetermined frequency to the servo circuit as the reference pulse if no reset signal is supplied to the reset terminal, or, if a reset signal is supplied to the reset terminal, to cause the phase of the internal vertical synchronizing signal to coincide with the phase of the reset signal. An external vertical synchronizing signal separating circuit is arranged to receive a composite video signal and to separate an external vertical synchronizing signal from the composite video signal, thereby outputting the external vertical synchronizing signal. A reset-signal supplier supplies the separated external vertical synchronizing signal to the reset terminal of the internal-vertical-synchronizing-signal generating circuit.
REFERENCES:
patent: 4409627 (1983-10-01), Eto
patent: 4638375 (1987-01-01), Motoyama
patent: 4710825 (1987-12-01), Okita
Patent Abstracts of Japan, vol. 11, No. 325, [E551], Oct. 22, 1987, & JP62-112483.
Asahi Kogaku Kogyo Kabushiki Kaisha
Young W. R.
LandOfFree
Rotation control apparatus for use with recording medium does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotation control apparatus for use with recording medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotation control apparatus for use with recording medium will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-177306