Acoustic touch position sensor using a low acoustic loss transparent substrate
US6236391A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1997 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Oct 21, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0436
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An 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 SiO.sub.2 as the main component with a total content of Na.sub.2 O, CaO and MgO of 20% by weight or less and a total content of Al.sub.2 O.sub.3, ZrO.sub.2, TiO.sub.2, B.sub.2 O.sub.3, Y.sub.2 O.sub.3, SnO.sub.2, PbO.sub.2, In.sub.2 O.sub.3 and K.sub.2 O of 5% by weight or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.