| 摘要 |
<p>A touch panel employing SAW excitation and receiving elements arranged diagonally across a rectangular substrate. Surface acoustic waves are propagated in a lower-left oblique direction and a lower-right oblique direction from an excitation element (2) located on the upper side of a non-piezoelectric substrate (1) and then received by receiving elements (3) located on the left side and the right side, while surface acoustic waves are propagated in an upper-left oblique direction and an upper-right oblique direction from an excitation element (2) located on the lower side of the non-piezoelectric substrate (1) and then received by the receiving elements (3) located on the left side and the right side. Based on the received results at the two receiving elements (3), a position of an object in contact with the non-piezoelectric substrate (1) is detected. The sensitivity in a region near the diagonal, which is influenced largely by propagation loss of the surface acoustic waves, is improved by increasing the widths of the electrode fingers (8) of the excitation elements (2) and/or the receiving elements (3), the number of pairs of the electrode fingers (8), the aperture width of comb-like electrodes (5), the position of terminals (9) for connection to an external device, or by providing additional elements (2a, 3a) disposed at the corners of the substrate (1), according to an increase in the propagation distances of the surface acoustic waves, i.e., toward the diagonal of the panel.
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