Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-11-12
1976-05-11
Canney, Vincent P.
Telegraphy
Systems
Simplex-reversing periodic
274 23R, A63D 1510, H04N 700
Patent
active
039565815
ABSTRACT:
A conductive pickup arm has a first portion and a further portion. One end of the pickup arm first portion is secured to a player supporting structure by a pickup arm support. During playback, (1) the pickup arm first portion is substantially parallel to the turntable surface of the player, and (2) an end of the further portion remote from the pickup arm supported end is disposed near the turntable surface relative to the first portion. A nonconductive signal pickup holder carrying a signal pickup is pivoted to the further portion remote end by a nonconductive signal pickup holder support in a manner that normally disposes the holder axis substantially parallel to the turntable surface. An electrode incorporated in the signal pickup is coupled via the conductive pickup arm to a signal processing circuitry of the player. During playback, the pickup arm further portion positions the signal pickup holder support as near a disc record (disposed on the turntable surface) as practicable in order to reduce the angle subtended between (a) a line joining the signal pickup tip and the signal pickup holder support, and (b) the disc record surface, while reducing the undesirable stray capacitance between the conductive pickup arm further portion and a conductive coating on the disc record.
REFERENCES:
patent: 3328037 (1967-06-01), Lehmann et al.
Canney Vincent P.
Kulkarni Dilip A.
Meagher William H.
RCA Corporation
Whitacre Eugene M.
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