Acoustic touch position sensor using a low acoustic loss transparent substrate
Patent 6236391 Issued on May 22, 2001. Estimated Expiration Date: 
October 21, 2017. 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.
October 21, 2017. 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 ReferencesAcoustic touch position sensor with first order lamb wave reflective arrays Barium aluminosilicate glasses Acoustic touch position sensor Acoustic touch position sensor using higher order horizontally polarized shear wave propagation Acoustic touch position sensor using a low-loss transparent substrate Acoustic condition sensor employing a plurality of mutually non-orthogonal waves Patent #: 5854450 InventorsAssigneeApplicationNo. 954838 filed on 10/21/1997US Classes:345/177, Including surface acoustic detection178/18.04Acoustical (e.g., vibration, ultrasonic, etc.)ExaminersPrimary: Luu, MatthewAssistant: Blackman, Anthony Attorney, Agent or FirmInternational ClassesG09G 005/00G08C 021/00 Foreign Application Priority Data1997-05-14 JPAbstractAn acoustic touch panel or "touch screen" utilizes acoustic waves within a sensor substrate to determine the position of touch. The substrate is made of a temperable glass having an attenuation coefficient of less than or equal to about 0.6 dB/cm as determined at the substrate surface for 5.53 MHz Rayleigh waves as measured by the slope of a plot of amplitude versus distance for a signal through a pair of facing 0.5-inch wide wedge transducers mounted on a sample of the glass type under test having sufficient thickness to support Rayleigh wave propagation. An acoustic touch panel with a tempered low-acoustic-loss glass substrate. This makes possible large tempered acoustic touch panels.A glass substrate of the touch sensor comprises SiO2 as the main component with a total content of Na2 O, CaO and MgO of 20% by weight or less and a total content of Al2 O3, ZrO2, TiO2, B2 O3, Y2 O3, SnO2, PbO2, In2 O3 and K2 O of 5% by weight or more.Field of SearchIncluding surface acoustic detectionTransparent substrate having light entrapment capability (i.e., waveguides) Touch panel Position coordinate determination for writing (e.g., writing digitizer pad, stylus, or circuitry) Writing digitizer pad Acoustical (e.g., vibration, ultrasonic, etc.) | |
