Touch panel device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 14, 2003
Grant Date -
N/A
app pub date -
Nov 15, 2000
filing date -
Nov 15, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There are provided microphones 11A, 11B arranged at least any two different locations of edge portions of a touch panel 10, for sensing a ultrasonic signal propagated through a space, an input pen 12 containing a piezoelectric loudspeaker 12G, for oscillating a ultrasonic wave that is output from the piezoelectric loudspeaker 12G, and a touch position sensor 13 for calculating a coordinate of a touch position P by calculating distances between the microphones 11A, 11B and the touch position P of the input pen 12 on the touch panel 10 based on the ultrasonic wave sensed by the microphones 11A, 11B, whereby the microphones 11A, 11B have a sound collecting directivity characteristic in response to fitted positions of the edge portions of the touch panel 10.
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