| 摘要 |
Surface acoustic waves are transmitted from a respective plurality of excitation elements to a non-piezoelectric substrate, and the surface acoustic waves propagating in the non-piezoelectric substrate are received by a respective receiving elements, thus a position of an object in contact with the non-piezoelectric substrate is detected based on received results in the receiving elements. An indicated direction is detected based on a reception level of surface acoustic waves in the receiving elements. A direction of a vector starting at the center of a range (contact range) in which a reception level is not higher than a predetermined level and ending at a position obtained based on the reception level is detected as a direction indicated by a user. The indicated direction can be detected even when the object stays at a position.
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