Capacitive touchpad and method for forming the same
First Claim
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1. A capacitive touchpad comprising:
- a membrane having a sandwich structure including a first insulator layer, a Y trace, a second insulator layer, an X trace, and a third insulator layer sequentially in stack; and
a printed circuit board having a first conductor layer electrically connected to the X and Y traces and a second conductor layer on a first surface and a second surface of a substrate, respectively, and a plurality of vias electrically connected between the first and second conductor layers.
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Abstract
A capacitive touchpad comprises a membrane and a printed circuit board combined together. The membrane comprises an X trace and a Y trace with an insulator layer inserted therebetween, and the printed circuit board has connection pads on a top side of a substrate that are electrically connected to the X and Y traces. The printed circuit board further comprises vias connected between the connection pads and a conductor layer on the bottom side of the substrate. To form the capacitive touchpad, the membrane and printed circuit board are individually produced in advance, and then combined together. Alternatively, the membrane is printed on the printed circuit board.
85 Citations
24 Claims
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1. A capacitive touchpad comprising:
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a membrane having a sandwich structure including a first insulator layer, a Y trace, a second insulator layer, an X trace, and a third insulator layer sequentially in stack; and
a printed circuit board having a first conductor layer electrically connected to the X and Y traces and a second conductor layer on a first surface and a second surface of a substrate, respectively, and a plurality of vias electrically connected between the first and second conductor layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A capacitive touchpad comprising:
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a membrane having a sandwich structure including a first insulator layer, a Y trace, a second insulator layer, and an X trace sequentially in stack; and
a printed circuit board having a plurality of connection pads electrically connected to the X and Y traces and a conductor layer on a first surface and a second surface of a substrate, respectively, and a plurality of vias electrically connected between the plurality of connection pads and conductor layer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for forming a capacitive touchpad, comprising the steps of:
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producing a printed circuit board having a plurality of connection pads on a surface of the printed circuit board;
producing a membrane by printing a Y trace on a first insulator layer, forming a second insulator layer over the Y trace, printing an X trace on the second insulator layer, and forming a third insulator layer over the X trace; and
combining the printed circuit board with the membrane including having the plurality of connection pads electrically connected to the X and Y traces. - View Dependent Claims (22, 23)
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24. A method for forming a capacitive touchpad, comprising the steps of:
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printing an X trace on a printed circuit board;
forming a first insulator layer over the X trace;
printing a Y trace on the first insulator layer; and
attaching a second insulator layer onto the Y trace.
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Specification