Automatic record player of linear tracking pickup arm type

Details Automatic record player of linear tracking pickup arm type Automatic record player of linear tracking pickup arm type

1977-03-29

1979-01-16

Dahl, Lawrence J.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

274 9RA, 274 23A, H01J 314

Patent

active

041350863

ABSTRACT:
In a linear tracking pickup arm type automatic record player, the position of the pickup arm is opto-electrically detected by the use of a multi-window scale and a photo-coupler unit, and the pre-assigned position signals stored in a memory are compared with the detected position signal to control the movement of the pickup arm. Therefore, the reproduction and the precisely repeated reproduction of any part of a record disk are made possible.

REFERENCES:
patent: 3506269 (1970-04-01), Hannah
patent: 4039826 (1977-08-01), Wingate

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