Patent ID: 9178511
Filing Date: 2015-11-03
Classification: H03K

Abstract:
1. A capacitive keypad position sensor, comprising: a keypad touch panel having a first defined key area disposed in a plane having first and second orthogonal axes; a first electrode occupying a first area below the first defined key area, the first electrode including a first plurality of generally parallel rows extending along the first axis and spaced apart from one another along the second axis, each of the first plurality of rows having a length along the first axis that is substantially equal to a width of the first defined key area along the first axis measured at a position along the second axis corresponding to the respective one of the first plurality of rows; and a second electrode occupying a second area below the first defined key area, the second electrode including a second plurality of generally parallel rows extending along the first axis and spaced apart from one another along the second axis, each of the second plurality of rows having a length along the first axis that is substantially equal to a width of the first defined key area along the first axis measured at a position along the second axis corresponding to the respective one of the second plurality of rows, at least some of the first and second pluralities of rows being interleaved with one another.