Method and apparatus for tone arm magnetic stabilization and damping system
OwnerRobert J. Grahaminventor
Life of this patent
Estimating the term…
Abstract
A unipivot tone arm assembly wherein the tone arm is supported by a single point is balanced in such a way as to have neutral stability providing constant tracking force over the peaks and valleys of phonograph records. Lateral stability lacking in a neutral balanced unipivot tone arm is provided by magnetic coupling between magnets on the tone arm housing assembly and a freely rotating platform. Anti-skate is accomplished through a pulley mechanism between the rotating platform and the tone arm gantry, with the pulley on a counterweighted rotating pivot arm.
Claims13
A stabilizer for stabilizing a movement of a provided tone arm, wherein the tone arm includes a housing assembly and a base having an axis, the housing assembly couples to the base and rotates around the axis, the stabilizer comprising:
- a support;
- a first magnet;
- and
- a second magnet;
- wherein:
- the support couples to the base and rotates around the axis;
- the first magnet couples to the housing assembly;
- the second magnet couples to the support;
- the first magnet is separated from the second magnet by a gap of air;
- a magnetic flux across the gap attracts the second magnet to a position proximate to the first magnet thereby rotating the support relative to the housing assembly to stabilize the movement of the tone arm.
A stabilizer for stabilizing a movement of a provided tone arm, wherein the tone arm includes a housing assembly, a base having a first axis, and a gantry, the housing assembly couples to the base and rotates around the first axis, the stabilizer comprising:
- a support;
- a first magnet;
- a second magnet;
- a pulley wheel;
- a pivoting arm having a first end and a second end;
- a pivot point having an second axis;
- a pulley drive belt having a first end and a second end;
- a counterweight;
- and
- a rod;
- wherein:
- the support couples to the base and rotates around the first axis;
- the first magnet couples to the housing assembly;
- the second magnet couples to the support;
- the first magnet is positioned proximate to the second magnet across a gap of air;
- the pulley wheel couples to the first end of the pivoting arm;
- the second end of the pivoting arm couples to the pivot point and rotates around the second axis;
- the pivot point couples to the gantry;
- the first end of the pulley drive belt couples to the support;
- the second end of the pulley drive belt couples to the gantry;
- the counterweight moveably couples to the rod along a length of the rod;
- the rod couples to the pivot point thereby stabilizing the movement of the tone arm.
A stabilizer for stabilizing a movement of a provided tone arm, wherein the tone arm includes a housing assembly and a base, the housing assembly rotationally couples to the base, the stabilizer comprising:
- a support that rotationally couples to the base and is positioned in concentric rotational alignment with the housing assembly;
- a first magnet having a first pole and a second pole;
- and
- a second magnet having a third pole and a fourth pole;
- wherein:
- the first pole couples to the housing assembly;
- the third pole couples to the support;
- the second pole is positioned proximate the fourth pole separated by a gap of air;
- the second pole magnetically attracts the fourth pole across the gap to stabilize the movement of the tone arm.
A method performed by a stabilizer for stabilizing a movement of a tone arm, the method comprising:
- detecting a magnetic attraction;
- rotating a support relative to a tone arm housing assembly in response to detecting;
- wherein:
- a first magnet couples to the tone arm housing assembly;
- a second magnet couples to the support;
- the first magnet is separated from the second magnet by a gap of air;
- a magnetic flux across the gap attracts the second magnet to a position proximate to the first magnet thereby rotating the support relative to the tone arm housing assembly to stabilize the movement of the tone arm.
Dependencies are inferred from the claim text.