Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
Patent
1983-12-19
1986-10-28
Stephan, Steven L.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specific detail of storage medium support or motion production
210112, 210268, 318115, 360 86, 360 97, 360105, 369219, 369249, H02K 2900, G11B 1700, G11B 582
Patent
active
046203010
ABSTRACT:
A turntable for placing a recording disk such as an optical information storage disk has a rotatable shaft to which an electrically conductive rotor is fixed. Inner and outer stators are disposed in confronting relation to each other with the rotor interposed therebetween. Each stator has a C shape with a recess in which there is placed one end of a radial feed unit for moving a pickup head radially across the turntable for recording information on or retrieving information from the disk on the turntable while the latter is being rotated. The outer stator comprises a comb-shaped block having a plurality of teeth with coils wound thereon in different phases. When sinusoidal currents are supplied to the coils, the stator produces a moving sinusoidal magnetic field to rotate the rotor according to the principles of a polyphase induction motor. The rotor may double as the turntable.
REFERENCES:
patent: 3947886 (1976-03-01), Hiedecker et al.
patent: 3972535 (1976-08-01), Bleiman
patent: 4072315 (1978-02-01), Tsujihara et al.
patent: 4131828 (1978-12-01), Houshi
patent: 4143409 (1979-03-01), Iwabuchi et al.
patent: 4377761 (1983-03-01), Staciokas
patent: 4481613 (1984-11-01), Yokota
Ricoh & Company, Ltd.
Shoup Guy W.
Stephan Steven L.
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