Stylus tip shape
First Claim
Patent Images
1. A stylus tip of a stylus comprising:
- a first conductive element coupled to a second conductive element and collectively configured to resemble an umbrella shape, wherein;
the first conductive element is disposed substantially at a point of contact between the stylus tip and a capacitive sensing surface, wherein the first conductive element includes a convex surface facing the capacitive sensing surface and a concave surface facing away from the capacitive sensing surface, and is configured to produce a field distribution having a greater density at locations substantially opposite a tilt direction of the stylus and independent of the axial rotation of the stylus, andthe second conductive element is configured to couple the first conductive element at the concave surface of the first conductive element to a body of the stylus, wherein the second conductive element is elongated and is substantially narrower than the first conductive element; and
a dielectric material disposed directly around the second conductive element, the dielectric material configured to provide a pen shape to the stylus tip.
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Abstract
Stylus tip configurations may reduce shadow effect of the stylus tip on capacitance measurements by reducing capacitive coupling between undesired portions of the stylus tip and the capacitive sensing surface. Additionally signal-to-noise ratio (SNR) of a stylus on a plurality of capacitance sensing electrodes may be improved by reducing the self capacitance between the stylus tip and the receive electrodes of a mutual capacitance touch screen.
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Citations
19 Claims
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1. A stylus tip of a stylus comprising:
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a first conductive element coupled to a second conductive element and collectively configured to resemble an umbrella shape, wherein; the first conductive element is disposed substantially at a point of contact between the stylus tip and a capacitive sensing surface, wherein the first conductive element includes a convex surface facing the capacitive sensing surface and a concave surface facing away from the capacitive sensing surface, and is configured to produce a field distribution having a greater density at locations substantially opposite a tilt direction of the stylus and independent of the axial rotation of the stylus, and the second conductive element is configured to couple the first conductive element at the concave surface of the first conductive element to a body of the stylus, wherein the second conductive element is elongated and is substantially narrower than the first conductive element; and a dielectric material disposed directly around the second conductive element, the dielectric material configured to provide a pen shape to the stylus tip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A stylus tip of a passive stylus comprising:
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a first conductor coupled to a second conductor and collectively configured to resemble an umbrella shape, wherein; the first conductor is configured to capacitively couple to a plurality of mutual capacitance sensing electrodes disposed on a sensing surface, wherein the first conductor includes a convex surface facing the sensing surface and a concave surface facing away from the sensing surface and is configured to produce a field distribution having a greater density at locations substantially opposite a tilt direction of the stylus and independent of the axial rotation of the stylus; the second conductor coupled to the first conductor at the concave surface of the first conductor and to the body of the stylus, wherein the second conductor is substantially narrower than the first conductor; an LC filter coupled between the second conductor and the body of the stylus; and a dielectric material disposed around and in direct contact with the second conductor, the dielectric material configured to provide a pen shape to the stylus tip. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method comprising:
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forming a conductive element of a stylus tip, the conductive element comprising; a first portion coupled to a second portion and collectively configured to resemble an umbrella shape, wherein; the first portion has a first width, includes a convex surface facing a capacitive sensing surface and a concave surface which facing away from the capacitive sensing surface, and is configured to produce a field distribution having a greater density at locations substantially opposite a tilt direction of the stylus and independent of the axial rotation of the stylus, and the second portion has a second width substantially smaller than the first width, is coupled to the first portion at the concave surface of the first portion, and is coupled to a body element of the stylus; and forming a dielectric material around and in direct contact with the second portion of the conductive element, the dielectric material configured to prove a pen shape to the stylus tip. - View Dependent Claims (18, 19)
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Specification