Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
2005-08-16
2010-12-28
Nguyen, Chanh (Department: 2629)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
Reexamination Certificate
active
07859522
ABSTRACT:
A touch panel device includes an excitation transducer for exciting a surface acoustic wave upon application of a burst wave and a reception transducer for receiving the surface acoustic wave and converting the same into a reception signal that are arranged at a peripheral portion of a detection area so that a position of an object touching the detection area is detected in accordance with a change in the reception signal. A control method for eliminating noises in the touch panel device includes the steps of detecting a differential between a reception signal due to a burst wave and another reception signal due to another burst wave, deciding that there is a noise if the detected differential exceeds a preset threshold value, and performing a control operation so that the detection of an object based on the reception signal is not performed in accordance with the decision.
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Office Action from the Japanese Patent Office dated Mar. 24, 2009 in the corresponding Japanese Patent Application No. JPA2005-083817, No.
Katsuki Takashi
Nakazawa Fumihiko
Sano Satoshi
Takahashi Yuji
Fujitsu Limited
Nguyen Chanh
Walthall Allison
Westerman Hattori Daniels & Adrian LLP
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