Methods and apparatus for data input
First Claim
1. Apparatus for determining position of a conductive passive object such as a person'"'"'s finger, hand, or conductive object held in the person'"'"'s hand comprisingat least one first electrode strip,at least one second electrode strip disposed adjacent to the first electrode strip to cross thereover and define a cross-over region,means for supplying electrical charges to the at least one first electrode strip and the at least one second electrode strip, to thereby develop electric fields such that a mutual capacitance is present therebetween, said mutual capacitance decreasing when the object is positioned in proximity to the cross-over region, the degree of such decrease depending upon the relative position of the passive object to the cross-over region,means for measuring the decrease in mutual capacitances between the strips, andmeans responsive to said measuring means for determining the position of the object relative to the cross-over region.
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Accused Products
Abstract
Methods and apparatus for data input. Devices are provided in accordance with this invention which utilize capacitive coupling of an object to the device to sense the object'"'"'s position. The devices are comprised of a plurality of electrode strips which form virtual electrodes. The virtual electrodes are selectively connected to form virtual dipole electrodes which are responsive to the object'"'"'s position.
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Citations
14 Claims
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1. Apparatus for determining position of a conductive passive object such as a person'"'"'s finger, hand, or conductive object held in the person'"'"'s hand comprising
at least one first electrode strip, at least one second electrode strip disposed adjacent to the first electrode strip to cross thereover and define a cross-over region, means for supplying electrical charges to the at least one first electrode strip and the at least one second electrode strip, to thereby develop electric fields such that a mutual capacitance is present therebetween, said mutual capacitance decreasing when the object is positioned in proximity to the cross-over region, the degree of such decrease depending upon the relative position of the passive object to the cross-over region, means for measuring the decrease in mutual capacitances between the strips, and means responsive to said measuring means for determining the position of the object relative to the cross-over region.
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10. Apparatus for determining the position of a conductive passive object such as a person'"'"'s finger or hand or conductive object held in the person'"'"'s hand comprising
pad means for sensing the object'"'"'s position, the pad means including a plurality of first electrode strips spaced apart in a first array one or more second electrode strips disposed to cross over the first electrode strips to define overlapping regions on the first electrode strips by the second electrode strip, wherein mutual capacitances are developed between the first electrode strips and second electrode strip, wherein the object perturbs the mutual capacitances when the object comes in proximity to the pad means, thereby decreasing the mutual capacitances, and measurement means operatively coupled to the pad means for measuring the decrease in mutual capacitances in the pad means to thereby determine the position of the object relative to the pad means.
Specification