Tone arm
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United States of America Patent
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-
Feb 11, 1986
Grant Date -
N/A
app pub date -
Oct 11, 1984
filing date -
Oct 11, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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