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US Patent 6400359 - Apparatus for detecting an approaching conductor, or an approach point of a conductor and an electrostatic capacity type touch panel apparatus
US Patent Issued on June 4, 2002
Estimated Patent Expiration Date:
August 26, 2019Estimated 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.
Estimated Patent Expiration Date:
August 26, 2019Estimated 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.AbstractThere are provided an apparatus for detecting an approaching conductor and an approach point or position of a conductor, in which a signal processing is simply performed and an improvement in the noise resistance is performed without the influence of a floating capacity. The apparatus has a voltage-oscillating system for equivalently receiving electric oscillation (AC signal) from a detected conductor so that the received electric oscillation is processed as a signal to ground and the processed signal is send to a non-oscillating system through an isolator, the system including a sensor panel or a sensor conductive array, a shield plate, a signal processing circuit, a ground, and power source. In addition, in order to clearly and securably identify a cause of the false earth effect of a detected conductor such as a human body, over 200 kHz oscillation frequency is provided. There is also provided an electrostatic capacity coupling type touch panel apparatus, in which an AC signal is applied into a finger, AC signal being 200 or more kHz frequency. | InventorAssigneeApplicationNo. 383653 filed on 08/26/1999US Classes:345/173, Touch panel345/174, Including impedance detection345/179StylusField of Search345/173, Touch panel345/174, Including impedance detection178/18.01, Position coordinate determination for writing (e.g., writing digitizer pad, stylus, or circuitry)178/18.03, Writing digitizer pad178/18.05, Resistive178/18.08, Having shield178/19.01, Writing digitizer stylus178/20.01, Writing digitizer circuit178/20.03Sampling circuitExaminersPrimary: Shalwala, BipinAssistant: Nguyen, Jimmy Attorney, Agent or FirmUS Patent References4071691, Human-machine interface apparatusIssued on: 01/31/1978 Inventor: Pepper, Jr.4371746, Edge terminations for impedance planes Issued on: 02/01/1983 Inventor: Pepper, Jr.4698460, Touch panel system Issued on: 10/06/1987 Inventor: Krein , et al.4853498, Position measurement apparatus for capacitive touch panel system Issued on: 08/01/1989 Inventor: Meadows , et al.4922061, Capacitive touch panel system with randomly modulated position measurement signal Issued on: 05/01/1990 Inventor: Meadows, et al.5053757, Touch panel with adaptive noise reduction Issued on: 10/01/1991 Inventor: Meadows6239788Coordinate input device and display-integrated type coordinate input device capable of directly detecting electrostatic coupling capacitance with high accuracy Issued on: 05/29/2001 Inventor: Nohno , et al. Foreign Patent References
International ClassG09G 005/00Foreign Application Priority Data1998-08-27 JP |
