Sensor for capacitive touch pad pointing device
First Claim
1. A capacitive touch pad comprising cover and first layers,the cover layer comprising a non-conductive cover providing galvanic isolation of the first layer,the first layer comprising a plurality of row-shaped row-sensing electrodes and a row-by-column array of column-sensing electrodes,each column of column-sensing electrodes interconnected by conductive traces,the row-sensing electrodes and column-sensing electrodes defining interleaved combs therebetween,each column-sensing electrode overlapping at least two row-shaped, row-sensing electrodes,each comb comprising at least two fingers.
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Accused Products
Abstract
The topology and the shape of sensing electrodes (4, 31) on the Capacity Touch Pad Sensor that allow sensing of small targets are disclosed. Sensor construction utilizes common PCB manufacture technique.
62 Citations
29 Claims
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1. A capacitive touch pad comprising cover and first layers,
the cover layer comprising a non-conductive cover providing galvanic isolation of the first layer, the first layer comprising a plurality of row-shaped row-sensing electrodes and a row-by-column array of column-sensing electrodes, each column of column-sensing electrodes interconnected by conductive traces, the row-sensing electrodes and column-sensing electrodes defining interleaved combs therebetween, each column-sensing electrode overlapping at least two row-shaped, row-sensing electrodes, each comb comprising at least two fingers.
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12. A capacitive touch pad comprising cover and first layers,
the cover layer comprising a non-conductive cover providing galvanic isolation of the first layer, the first layer comprising a plurality of row-shaped row-sensing electrodes and a row-by-column away of column-sensing electrodes, each column of column-sensing electrodes interconnected by conductive traces, the row-sensing electrodes and column-sensing electrodes defining interleaved combs therebetween, each column-sensing electrode overlapping at least two row-shaped, row-sensing electrodes, each comb comprising at least two fingers, the touch pad further comprising a second layer, the first layer lying between the cover and second layers, the second layer comprising a ground plane.
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14. A capacitive touch pad comprising cover and first layers,
the cover layer comprising a non-conductive cover providing galvanic isolation of the first layer, the first layer comprising a plurality of row-shaped row-sensing electrodes and a row-by-column array of column-sensing electrodes, each column of column-sensing electrodes interconnected by conductive traces, the row-sensing electrodes and column-sensing electrodes defining interleaved combs therebetween, each column-sensing electrode overlapping at least two row-shaped, row-sensing electrodes, each comb comprising at least two fingers, wherein in the first layer further comprises annular copper around the electrodes.
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18. A capacitive touch pad,
the touch pad defining top, bottom, left, and right edges, the pad comprising cover and first layers, the cover layer comprising a non-conductive cover providing galvanic isolation of the first layer, the first layer comprising a plurality of row-shaped row-sensing electrodes each extending toward the left and right edges, and a row-by-column array of column-sensing electrodes, each column of column-sensing electrodes interconnected by conductive traces, the row-sensing electrodes and column-sensing electrodes defining interleaved combs therebetween, each column-sensing electrode overlapping at least two row-shaped, row-sensing electrodes, each comb comprising at least two fingers, at least one regular row-shaped row-sensing electrode having fingers extending toward the top edge and having fingers extending toward the bottom edge, at least one row of column-sensing electrodes having fingers extending toward the top edge and having fingers extending toward the top edge.
Specification