Sound reproducing device incorporating a device for selecting a

Details Sound reproducing device incorporating a device for selecting a Sound reproducing device incorporating a device for selecting a

1980-11-24

1982-11-30

Phillips, Charles E.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 31, G11B 722

Patent

active

043618820

ABSTRACT:
Before starting a sound reproduction, a distance between a record disc and a sound transmitting member which is disposed on a tone arm for pushing the tone arm, is held by a movable blade of an electromagnetic actuator.
When a rotary switch attached beneath the record disc rotates by the rotation of the record disc and contacts one of a plurality of fixed contacts which have been positioned to satisfy a predetermined locational relationship with respect to a portion on which the pickup descends before it enters the starting point of the selected record groove, the electromagnetic actuator is energized to release its support of the sound transmitting member or the record disc.
By virtue of this construction the tone arm of the pickup is engaged with the specific record groove of the record disc at a point before it reaches the starting point of the specific record groove.
Consequently this sound reproducing device assures correct and firm sound reproduction, particularly suitable for selective sound reproduction of a record disc having a plurality of record grooves.

REFERENCES:
patent: 3825268 (1974-07-01), Holland et al.
patent: 4234193 (1980-11-01), Shiseki

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