Capacitive touch keyboard

摘要

A capacitive touch keyboard includes a shielding layer, a 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 shielding layer includes a ground plane, and plural first key areas at its outer surface. The one-dimensional sensor layer includes plural sensing cells and plural second key areas where the first key areas correspond to the second key areas, and respective cells are electrically connected to a 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 shielding layer comprising a ground plane, wherein the shielding layer further comprises plural first key areas at an outer surface of the shielding layer; a one-dimensional sensor layer comprising plural sensing cells, wherein the one-dimensional sensor layer further comprises plural second key areas at an outer surface of the one-dimensional sensor layer, and the plural sensing cells correspond to the plural second key areas and the plural first key areas; an intermediate layer interposed between the ground plane of the shielding layer and the one-dimensional sensor layer so as to form a capacitor structure, wherein the shielding layer, the intermediate layer and the one-dimensional sensor layer are configured to have a clearance between the shielding layer and the one-dimensional sensor layer changeable in response to a pressing operation of a user on the plural first key areas or the plural second key areas; and a sensing circuit electrically connected to the plural sensing cells to probe a capacitance change.