Patent ID: 6633280
Filing Date: 2003-10-14
Classification: G06F

Abstract:
A touch panel device for sensing a touch position on a touch panel comprising:a flat display device; the touch panel provided in front of the flat display device; an input pen containing a signal oscillating member, for oscillating a sound signal that is output from the signal oscillating member from a top end portion; two sound collecting members respectively arranged at least at any two different locations of edge portions of the touch panel, for sensing the sound signal propagated through a space; a coordinate position calculating member for calculating a coordinate of the touch position of the input pen on the touch panel by calculating distances between the two sound collecting members and the touch position of the input pen on the touch panel, based on the sound signal oscillated from the input pen to be sensed by the sound collecting members; and an oscillating signal absorbing member for absorbing the sound signal oscillated from the signal oscillating member to edge portions of the touch panel, wherein the sound collecting members have a sound collecting directivity characteristic that covers an overall surface of the touch panel in response to fitted positions of the edge portions of the touch panel.