Force-sensitive input device
First Claim
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1. An input device for computing devices comprising:
- an outer housing having an inner surface that provides a variable resistance;
an inner shaft at least partially received within the outer housing;
a nib operatively coupled to the inner shaft;
whereinproviding a first force to the nib causes the inner shaft to contact the inner surface at a first contact point along the outer housing;
providing a second force to the nib causes the inner shaft to contact the inner surface of the outer housing at a second contact point along the outer housing, wherein the first and second contact points are at different locations along a length of the outer housing, and wherein the input device generates a first electrical signal in response to the inner shaft contacting the inner surface of the outer housing at the first contact point and generates a second electrical signal in response to the inner shaft contacting the inner surface of the outer housing at the second contact point, anda circuit that measures the first and second forces provided to the nib by measuring capacitance discharges across the variable resistance of the inner surface when the inner shaft contacts the inner surface at the first and second contact points.
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Abstract
An input device for computing devices that include touch screens. The input device includes an outer housing having an inner surface and an inner shaft. The inner shaft is at least partially received within the outer housing. A nib is operatively coupled to the inner shaft. Providing a first force to the nib causes the inner shaft to contact the inner surface of the outer housing at a first contact point along the outer housing, and providing a second force to the nib causes the inner shaft to contact the inner surface of the outer housing at a second contact point along the outer housing.
103 Citations
23 Claims
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1. An input device for computing devices comprising:
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an outer housing having an inner surface that provides a variable resistance; an inner shaft at least partially received within the outer housing; a nib operatively coupled to the inner shaft;
whereinproviding a first force to the nib causes the inner shaft to contact the inner surface at a first contact point along the outer housing; providing a second force to the nib causes the inner shaft to contact the inner surface of the outer housing at a second contact point along the outer housing, wherein the first and second contact points are at different locations along a length of the outer housing, and wherein the input device generates a first electrical signal in response to the inner shaft contacting the inner surface of the outer housing at the first contact point and generates a second electrical signal in response to the inner shaft contacting the inner surface of the outer housing at the second contact point, and a circuit that measures the first and second forces provided to the nib by measuring capacitance discharges across the variable resistance of the inner surface when the inner shaft contacts the inner surface at the first and second contact points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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an inner shaft having first and second opposing ends and including an electrically conductive portion at the first end, wherein the inner shaft extends between the first and second opposing ends along a longitudinal axis; a nib operatively coupled to the second end of the inner shaft and configured to bias the inner shaft in a biasing direction within a rigid housing; and a plurality of parallel conductive disks attached to the inner shaft along the longitudinal axis between the electrically conductive portion and the nib, wherein each of the conductive disks makes electrical contact with an inner surface of the rigid housing at a respective location of the rigid housing along the longitudinal axis, wherein the biasing direction is orthogonal to the longitudinal axis. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A stylus for providing an input to a touch interface of a computing device, comprising:
- an elongated body;
a nib operably coupled to the elongated body; and
an inner shaft operably coupled to the nib and at least partially received within the elongated body, wherein the inner shaft comprises an insulator and a conductive disc that contacts an inner surface of the elongated body;
whereinmovement of the nib causes a portion of the inner shaft interposed between the nib and the insulator to bend towards and make direct electrical contact with the inner surface of the elongated body and causes the conductive disc to slide along and make direct electrical contact with the inner surface of the elongated body. - View Dependent Claims (16, 17, 18)
- an elongated body;
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19. A method for operating an input device for a computing device, comprising:
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determining first and second contact positions at which an inner shaft makes direct electrical contact with an outer housing having an inner surface that provides a variable resistance, the first and second contact positions varying responsive to a force provided to the nib such that the inner shaft makes direct electrical contact with the inner surface at the first contact position in response to a first force and the inner shaft makes direct electrical contact with the inner surface at the second contact position in response to a second force that is different than the first force; with a circuit in the input device, measuring the first and second forces provided to the nib by measuring capacitance discharges across the variable resistance of the inner surface when the inner shaft contacts the inner surface at the first and second contact positions; and providing a first output signal responsive to the first contact position and providing a second output signal responsive to the second contact position. - View Dependent Claims (20, 21, 22, 23)
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Specification