Electromagnetic digitizer sensor array
First Claim
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1. An electromagnetic digitizer sensor coupled to a processor, comprising:
- a substrate;
a first array of sensing traces each coupled between the processor and a first potential node, each sensing trace in the first array being selectively connectable to the processor and further being selectively connectable to the first potential node; and
a second array of sensing traces each coupled between the processor and the first potential node, each sensing trace in the second array being selectively connectable to the processor and further being selectively connectable to the first potential node to form a loop between the first array of sensing traces and the second array of sensing traces,wherein the first array of sensing traces are each disposed at a first level of the substrate but not at a different second level of the substrate, andwherein the second array of sensing traces are each disposed at the second level of the substrate but not the first level.
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Abstract
An electromagnetic digitizer arrangement that may include a comb-like pattern of sensing traces that form various sensing loops depending upon the configurations of various switches is described. The comb arrangement of traces may be fabricated using only a single layer per sensing axis. Thus, the digitizer may be fabricated in a technology, such as indium tin oxide on glass, that cannot provide plated-through holes.
36 Citations
15 Claims
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1. An electromagnetic digitizer sensor coupled to a processor, comprising:
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a substrate; a first array of sensing traces each coupled between the processor and a first potential node, each sensing trace in the first array being selectively connectable to the processor and further being selectively connectable to the first potential node; and a second array of sensing traces each coupled between the processor and the first potential node, each sensing trace in the second array being selectively connectable to the processor and further being selectively connectable to the first potential node to form a loop between the first array of sensing traces and the second array of sensing traces, wherein the first array of sensing traces are each disposed at a first level of the substrate but not at a different second level of the substrate, and wherein the second array of sensing traces are each disposed at the second level of the substrate but not the first level. - View Dependent Claims (2, 3, 4)
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5. An electromagnetic digitizer sensor coupled to a processor, comprising:
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a substrate; a first plurality of sensing traces electrically coupled in parallel between the processor and a first node; a second plurality of sensing traces electrically coupled in parallel between a second node and the first node; a first plurality of switches each coupled between one of the first plurality of sensing traces and the processor; a second plurality of switches each coupled between one of the second plurality of sensing traces and the second node, a third plurality of sensing traces electrically coupled in parallel between the processor and a third node; a fourth plurality of sensing traces electrically coupled in parallel between the processor and a fourth node; a third plurality of switches each coupled between one of the third plurality of sensing traces and the processor; a fourth plurality of switches each coupled between one of the fourth plurality of sensing traces and the fourth node, wherein the first and second pluralities of sensing traces are disposed at a first level of the substrate but not at a second level of the substrate, wherein the third and fourth pluralities of sensing traces are disposed at the second level of the substrate but not at the first level of the substrate, wherein the first and second pluralities of sensing traces form first conductive loops, and wherein the third and fourth pluralities of sensing traces form second conductive loops. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification