Touch panel input device and control method thereof
December 6, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re33151 Surface acoustic wave touch panel system Tough control arrangement for graphics display apparatus Cathode ray tube for use in a touch panel display system Touch control system for controllable apparatus Touch control arrangement for graphics display apparatus Touch control arrangement for graphics display apparatus having saw reflectors of frit composition Acoustic mouse system Acoustic touch position sensor using shear wave propagation Autonomous computer input device and marking instrument InventorsAssigneeApplicationNo. 350596 filed on 12/06/1994US Classes:345/173, Touch panel178/19.02, Acoustical stylus345/177, Including surface acoustic detection345/179StylusExaminersPrimary: Powell, Mark R.Assistant: Kovalick, Vincent E. Attorney, Agent or FirmForeign Patent References
International ClassG09G 003/02Foreign Application Priority Data1993-12-07 JPAbstractA touch panel input device is provide with a panel capable of propagating surface acoustic waves and in which surface acoustic wave attenuation is caused by a object in contact with said panel. An emission circuit outputs a surface acoustic wave drive; and an emission transducer emits surface acoustic waves in the panel in accordance with the surface wave drive outputted from said emission circuit. A reception transducer receives surface acoustic waves in the panel and outputs a received acoustic signal. A reception circuit receives the received acoustic wave signal from the reception transducer to detect a position at which the received acoustic wave is attenuated as indicative of a position that the object contacts the panel. A controller controls the emission circuit and the reception circuit, and comprises a processor for computing a width of the contact by the object on the panel in accordance with a waveform detected by the reception circuit. A judging circuit distinguishes a type of object in contact based on the width obtained by the processor. | |
