Magnetic encoder knob with fixed center
First Claim
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1. An apparatus comprising:
- a substrate having a first surface and a second surface;
a knob rotatably associated with the first surface of the substrate, the knob having a peripheral surface and an axis of rotation;
a first magnet attached to the knob spaced from the axis of rotation;
a second magnet attached to the knob spaced from the axis of rotation and opposite the axis of rotation from the first magnet; and
a magnetic encoder associated with the second surface of the substrate;
wherein the first and second magnets are oriented so as to establish magnetic flux lines extending through the first magnet, the second magnet, and the encoder generally perpendicular to the axis of rotation;
wherein the encoder responds to rotation of the magnetic flux lines; and
wherein the portion of the substrate underlying the knob is imperforate.
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Abstract
A magnetic encoder knob system includes a knob associated with a first side of a substrate and a magnetic encoder associated with a second side of the substrate. First and second magnets are disposed in or on the knob such that magnetic flux lines extending between the first and second magnets pass through the encoder so that the encoder responds to rotation of the magnetic flux lines in response to rotation of the knob.
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Citations
20 Claims
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1. An apparatus comprising:
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a substrate having a first surface and a second surface; a knob rotatably associated with the first surface of the substrate, the knob having a peripheral surface and an axis of rotation; a first magnet attached to the knob spaced from the axis of rotation; a second magnet attached to the knob spaced from the axis of rotation and opposite the axis of rotation from the first magnet; and a magnetic encoder associated with the second surface of the substrate; wherein the first and second magnets are oriented so as to establish magnetic flux lines extending through the first magnet, the second magnet, and the encoder generally perpendicular to the axis of rotation; wherein the encoder responds to rotation of the magnetic flux lines; and wherein the portion of the substrate underlying the knob is imperforate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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a substrate having a first surface and a second surface; a knob rotatably associated with the first surface of the substrate, the knob having a peripheral surface and an axis of rotation; a first magnet attached to the knob spaced from the axis of rotation; a second magnet attached to the knob spaced from the axis of rotation and opposite the axis of rotation from the first magnet; and a magnetic encoder associated with the second surface of the substrate; wherein the first and second magnets are oriented so as to establish magnetic flux lines extending through the first magnet, the second magnet, and the encoder generally perpendicular to the axis of rotation; wherein the encoder responds to rotation of the magnetic flux lines; and wherein the substrate bears no magnetic coupling element providing magnetic coupling between the first and second magnets and the encoder.
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Specification