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US 4,302,834 AGranted
Phonograph pickup arm
OwnerJohn Prettoinventor
Life of this patent
Estimating the term…
Abstract
A phonograph pickup arm for use in disc records arranged to compensate for error in the tracking path. By use of adjacent curved surfaces in mounting and support members the point of rotational access of the pickup arm shifts as the stylus associated with the pickup arm moves left to right or vice versa to compensate for the usually present tracking error.
Claims7
A pickup arm assembly for a transducer including stylus means for engaging a spiral trace and detecting prerecorded signals on an associated rotating disc comprising:
- a transducer arm positioned for rotational movement parallel to the plane of said rotating disc, including a transducer mounted on one end thereof;
- a vertical mounting member mounted adjacent to and perpendicular to the plane of said rotating disc including a curved surface and a cavity centrally located through said vertical mounting member arranged to accept within said cavity said transducer arm;
- a vertical support member supporting said transducer arm, including a curved surface mounted against and in communication with said curved surface of said vertical mounting member;
- mounting means attached to said vertical mounting member, adapted to retain said vertical support member against and in communication with said curved surface of said vertical mounting member;
- said vertical support member arranged to traverse across said curved surface of said vertical mounting member responsive to mechanical force transmitted by said transducer arm as said transducer and stylus means traverse a path in communication with said spiral trace on said rotating disc.
2 more elements
Dependencies are inferred from the claim text.