Record player

Details Record player Record player

1980-07-08

1982-11-09

Shepperd, John W.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Mechanism condition or storage medium responsive control

369247, 318615, G11B 312

Patent

active

043588425

ABSTRACT:
A record player is described having a turntable which is rotated by a pulsed motor energized from a motor drive circuit. The motor driving circuit includes a negative feedback servo loop which includes means for detecting vibration of the arm. Means is further provided for generating an output in response to the vibration of said tone arm. A high-pass filter is provided having a cut-off frequency which is the same or lower than the resonance frequency of the tone arm. The motor is controlled by an output of the servo loop in proportion to an accelerated velocity of the tone arm when said tone arm is vibrating at less than the cut-off frequency.

REFERENCES:
patent: 3830505 (1974-08-01), Rabinow
patent: 4102536 (1978-07-01), Clunis
patent: 4111433 (1978-09-01), Raabe
patent: 4130786 (1978-12-01), Jacques
patent: 4138121 (1979-02-01), Nakajima et al.
patent: 4139811 (1979-02-01), Klinger
patent: 4200828 (1980-04-01), Ridler et al.

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