Turntable speed control

Details Turntable speed control Turntable speed control

1981-06-15

1983-11-22

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

G11B 2504

Patent

active

044173326

ABSTRACT:
A turntable drive system for use with a video disc player employs a low cost magnetic sensor, such as a Hall effect device, for turntable speed control. An integral motor mounting bracket and flux concentrator is positioned with respect to a ring magnet having a plurality of permanently magnetized poles of alternate polarity along its periphery such that the magnetic field of the magnetized ring passes through an active surface of the magnetic sensor. The Hall effect device provides an output representative of the rotary motion of the ring magnet which is fixed to the turntable. The output of the Hall effect device is compared to a reference oscillator and an error signal indicative of drift in the rotary speed of turntable from the predetermined speed is fed to a DC motor for driving the turntable at the desired rotational speed.

REFERENCES:
patent: 3831073 (1974-08-01), Tanikoshi
patent: 3842194 (1974-10-01), Clemens
patent: 3912283 (1975-10-01), Hammond et al.
patent: 4079942 (1978-03-01), Kunen
patent: 4194743 (1980-03-01), Ohsawa et al.
patent: 4223255 (1980-09-01), Goldman et al.
patent: 4239237 (1980-12-01), Pyles
patent: 4258299 (1981-03-01), Takeda et al.

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