Patent ID: 8830175

Claim:
An auxiliary input device for virtual keyboard sized on a displayed virtual keyboard of a capacitive touch panel, comprising: a membrane with a plurality of bulged supporting members arranged in correspondence to the plurality of virtual keys of the virtual keyboard, wherein a trough is arranged facing the virtual keyboard between every two adjacent supporting members; and a plurality of conducting keys arranged atop each of the supporting member and kept at a predetermined distance from the capacitive touch panel, the conducting keys selectively operable to establish contact with the capacitive touch panel; wherein an insulating layer is arranged beneath the membrane, wherein a plurality of through holes are aligningly arranged in correspondence to the virtual keys formed therein; wherein each of the supporting members and the conducting keys, the insulating layer, and the capacitive touch panel encirclingly defining an air room; wherein every two adjacent air rooms are connected through the trough, wherein at least one air room is arranged to provide gas communication with the outside surrounding of the input device, thereby enabling gas communication of all the air rooms between the input device and the touch screen to the outside either directly or indirectly.