Capacitive touch keyboard

摘要

A capacitive touch keyboard includes a soft shielding layer, a soft intermediate layer, and a one dimensional sensor layer where the soft intermediate layer is interposed between the other two to form a capacitor structure. The soft shielding layer includes a ground plane, a dielectric material covering on the ground plane, and plural key areas at its outer surface. The one dimensional sensor layer includes plural sensing cells which correspond to the key areas, and respective cells are electrically connected to a capacitance sensing circuit. Therefore, features of more compact size, simplified structure design, and tactile feel are provided in a capacitive keyboard.

主权项

1. A capacitive touch keyboard, comprising:
a soft shielding layer comprising a first ground plane and a dielectric material covering on the first ground plane, wherein the soft shielding layer also comprises plural key areas at an outer surface; a one dimensional sensor layer comprising plural first sensing cells corresponding to the plural key areas; a soft intermediate layer interposed between the first ground plane of the soft shielding layer and the one dimensional sensor layer so as to form a capacitor structure; and a capacitance sensing circuit electrically connected to the plural first sensing cells to probe a capacitance change.