Damper means for damping the resonance of disc record tone arms
OwnerAlexander R. Rangabeinventor
Life of this patent
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Abstract
This invention provides a damper for damping the resonance of a disc record tone arm comprising first and second relatively movable elements in engagement with energy absorbing material. The first element is secured relatively to the tone arm cartridge while the second element engages the record surface so as to be movable relatively thereto. The damper applies resistive force between the record surface and the cartridge to reduce variation in tracking force as the stylus traverses warps in the record surface.
Claims27
Damper means for damping the resonance of a disc record tone arm of the kind having a limb, adapted at one end for pivotal support in respective planes parallel with and normal to the plane of the record, and a cartridge including a stylus, said cartridge being mounted on the limb at a location remote from said end adapted for pivotal support, and being secured against vertical movement relatively to the limb, the damper means comprising:
- a first element, secured relatively to the tone arm cartridge;
- a second element in relatively movable engagement with said first element and extending toward the plane of the record in the operative position of the damper means;
- energy absorbing means, comprising energy absorbing material, disposed between said first and second elements, for causing resistive force to be applied with respect to relative movement between said first and second element;
- and
- skid means, connected to said second element for causing the damper means to come into direct mechanical contact with the record, when the damper means is in the operative position thereof, in such a manner that the damper means can slide transversely of the record trace without significant tracking of the record trace by the damper means,
- whereby variation in tracking force is reduced as the stylus traverses warps in the record surface.
Dependencies are inferred from the claim text.