Tone arm

Details Tone arm Tone arm

1984-10-11

1986-02-11

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specified detail of transducer assembly support structure

369244, 369246, 369252, G11B 310, G11B 318, G11B 312, G11B 330

Patent

active

045702535

ABSTRACT:
A tone arm for a phonograph pickup having a bifilar flexible ligament suspension for vertical and lateral displacement. The suspension takes the place of the more usual pivots, and employs a pair of thin flexible ligaments or fibers in a skewed convergent torsional bifilar configuration. The lower ends of the two ligaments are attached to a basal element, which may be shaped as a disc, connected to and lying below the arm itself. The flexibility of the ligaments confers freedom to the arm for angular displacement in the vertical and horizontal planes, but the skew prevents linear displacement along the direction of its length. The basal element is preferably immersed in a container of viscous liquid to damp movement of the arm.

REFERENCES:
patent: 3028161 (1962-04-01), Siebert
patent: 3088742 (1963-05-01), Alexandrovich
patent: 3556537 (1971-01-01), Stacy
patent: 3682485 (1972-08-01), Guha
patent: 3836155 (1974-09-01), Joannou

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