Automatic tone arm returning device

Details Automatic tone arm returning device Automatic tone arm returning device

1980-07-07

1982-08-31

Shepperd, John W.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Mechanism responsive to control structure on storage medium...

369226, G11B 1700

Patent

active

043475973

ABSTRACT:
An automatic tone arm returning device in a record player which comprises: pulse generator means for producing pulses whose cycle is proportional to the speed of the tone arm movement during record playing means for detecting the completion of record playing by measuring either the pulse width, the number of pulses produced in a unit of time, or the time interval between the pulses; and a Schmitt trigger circuit inserted between said two means and activated while the pulse is within a predetermined range of level; whereby the tone arm can be prevented from being return erroneously by the eccentric recorded grooves on record when the record is still being played.

REFERENCES:
patent: 2405526 (1946-08-01), Sinnett
patent: 3599984 (1971-08-01), Kondo
patent: 3701534 (1972-10-01), Laue
patent: 4145608 (1979-03-01), Shirasaki et al.
patent: 4240069 (1980-12-01), Hullein et al.

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