Method and apparatus for diminishing grid complexity in a tablet
First Claim
Patent Images
1. A grid used to determine transducer position, consisting of:
- a first serpentine to produce a first signal; and
a second serpentine overlapping the first serpentine to produce a second signal, wherein the second serpentine and the first serpentine form a pattern such that the second signal of the second serpentine compensates the first signal of the first serpentine so as to enhance linearity in determining the transducer position.
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Abstract
A grid consists of a first serpentine, and a second serpentine overlapping the first serpentine. Signals from the first and second serpentines are analyzed to determine transducer position. The first and second serpentines are foldback serpentines. The first serpentine is offset from the second serpentine by approximately ninety degrees.
235 Citations
44 Claims
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1. A grid used to determine transducer position, consisting of:
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a first serpentine to produce a first signal; and
a second serpentine overlapping the first serpentine to produce a second signal, wherein the second serpentine and the first serpentine form a pattern such that the second signal of the second serpentine compensates the first signal of the first serpentine so as to enhance linearity in determining the transducer position. - View Dependent Claims (2, 3)
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4. A grid used to determine transducer position, comprising:
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an x-grid;
a y-grid;
wherein the x-grid and y-grid each include a coarse and a fine resolution grid; and
wherein each fine resolution grid consists of;
a first serpentine to produce the first signal, and a second serpentine overlapping the first serpentine to produce a second signal, wherein the second serpentine and the first serpentine form a pattern such that the second signal of the second serpentine compensates the first signal of the first serpentine so as to enhance linearity in determining the transducer position. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A tablet used to determine transducer position, comprising:
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an x-grid;
a y-grid;
an x-axis multiplexer coupled to the x-grid;
a y-axis multiplexer coupled to the y-grid;
an amplifier and filter coupled to the x-axis and y-axis multiplexors;
a synchronous detector coupled to the amplifier and filter;
an analog to digital (A/D) convertor coupled to the synchronous detector;
a NAND gate circuit coupled to the A/D converter;
a processor coupled to the NAND gate circuit;
a first level converter coupled to the processor;
a second level converter coupled to the processor;
wherein the x-grid and y-grid each include a coarse and a fine resolution grid; and
wherein each fine resolution grid consists of;
a first serpentine, a second serpentine overlapping the first serpentine, and wherein signals from the first and second serpentines are analyzed to determine the transducer position. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A system, comprising:
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a processor;
a tablet, coupled to the processor, including, an x-grid;
a y-grid;
an x-axis multiplexer coupled to the x-grid;
a y-axis multiplexer coupled to the y-grid;
an amplifier and filter coupled to the x-axis and y-axis multiplexors;
a synchronous detector coupled to the amplifier and filter;
an analog to digital (A/D) convertor coupled to the synchronous detector;
a NAND gate circuit coupled to the A/D converter;
a second processor coupled to the NAND gate circuit;
a first level converter coupled to the second processor;
a second level converter coupled to the first and second processors;
wherein the x-grid and y-grid each include a coarse and a fine resolution grid; and
wherein each fine resolution grid consists of;
a first serpentine, a second serpentine overlapping the first serpentine, and wherein signals from the first and second serpentines are analyzed to determine the transducer position. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method of determining transducer position, comprising:
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determining a first set of possible transducer positions using a first resolution grid, wherein determining the first set includes using a first serpentine that produces a first signal and a second serpentine that produces a second signal, and wherein the first signal of the first serpentine compensates the second signal of the second serpentine to enhance linearity;
determining a second set of possible transducer positions using a second resolution grid; and
intersecting the first and second sets of possible transducer positions to determine transducer position. - View Dependent Claims (23, 24, 25, 26, 27, 28)
determining a first set of possible transducer positions comprises determining a relative transducer position and period section;
determining a second set of possible transducer positions comprises determining a period segment; and
intersecting the first and second sets of possible transducer positions to determine transducer position comprises intersecting the period section and period segment, and scaling the relative transducer position based on the intersection of the period section and period segment.
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29. A method of determining transducer position, comprising:
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determining a first set of possible transducer positions using a first resolution grid, wherein determining the first set includes using a first serpentine that produces a first signal and a second serpentine that produces a second signal, and wherein the first signal of the first serpentine compensates the second signal of the second serpentine to enhance linearity;
determining a second set of possible transducer positions using a second resolution grid;
determining a third set of possible transducer positions using a third resolution grid;
intersecting the first, second and third sets of possible transducer positions to determine transducer position. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
determining a first set of possible transducer positions comprises determining a relative transducer position and period section;
determining a second set of possible transducer positions comprises determining a period segment; and
determining a third set of possible transducer positions comprises determining a period side; and
intersecting the first, second and third sets of possible transducer positions to determine transducer position comprises intersecting the period section, period segment and period side, and scaling the relative transducer position based on the intersection of the period section, period segment and period side.
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38. A grid used to determine transducer position, comprising:
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means for determining relative transducer position, wherein means for determining includes a first serpentine that produces a first signal and a second serpentine that produces a second signal, and wherein the first signal of the first serpentine compensates the second signal of the second serpentine to enhance linearity; and
means for scaling the relative transducer position. - View Dependent Claims (39, 40, 41, 42, 43, 44)
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Specification