| 摘要 |
PROBLEM TO BE SOLVED: To obtain a large-sized touch panel by using a glass substrate with small acoustic wave attenuation and high transmission signal intensity. SOLUTION: The glass substrate 1 constituted of SiO2 as a main component and an additional component and an attenuation coefficient of which is about 0.25 dB/cm or less is used as a transmission medium of an acoustic wave. The glass substrate 1 is provided with a propagation speed practically same as that of a soda lime glass and BaO and/or B2 O3 are not practically included as the additional component. BaO and B2 O3 are not practically included, Al2 O3 , ZrO2 and SrO are included in the glass substrate 1, the content of ZrO2 is 3% by weight or more, the content of SrO is 6.5% by weight or more and ratio between Al2 O3 and ZrO2 is ZrO2 /(Al2 O3 + ZrO2 )=30 to 100% by weight. The large-sized and intensified acoustic wave system touch panel is obtained by using such glass substrate 1. |
