Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
Patent
1986-06-03
1988-03-08
Stephan, Steven L.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specific detail of storage medium support or motion production
384517, G11B 360
Patent
active
047302992
ABSTRACT:
In a disc playback device of a type in which a turntable is connected to a disc motor shaft, a device for preventing vibration of the disc motor shaft comprises magnetic biasing means for generating a magnetic force biasing the disc motor shaft in an axial or radial direction of the shaft. The magnetic biasing means is constructed by securing one of magnetic substance and a magnet to the turntable and disposing the other below the turntable or securing one of two magnets to the turntable and disposing the other magnet below the turntable. For preventing vibration of the disc motor shaft in the radial direction, a yoke plate is fixed to the magnet in such a manner that a part of the yoke plate is positioned on the lateral side of the magnetic substance or the other magnet.
REFERENCES:
patent: 3047297 (1962-07-01), Drake
patent: 4157185 (1979-06-01), Mayer
patent: 4256312 (1981-03-01), Ikeda
patent: 4328575 (1982-05-01), Elliott
patent: 4499573 (1985-02-01), Morinaga
Kamoshita Yasuhiko
Ogusu Mikio
Urata Kazuo
Nippon Gakki Seizo Kabushiki Kaisha
Stephan Steven L.
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