| 摘要 |
PURPOSE:To attain size reduction and simplification of a sending circuit system, and to obtain the convenience of use by sticking a surface acoustic wave element which is formed by providing a comb-shaped electrode on a piezoelectric substrate on a metallic film formed on a body to be inspected, and connecting a transmitting circuit. CONSTITUTION:The surface acoustic wave (SAW) element 2 is stuck on the metallic film 1 formed on the body to be formed. The element 2 is formed by providing the comb-shaped electrode 4 on the surface of the piezoelectric substrate 3, and a surface wave generated on the surface of the substrate 3 with a signal inputted from an input terminal 5 is reflected successively by the comb- shaped electrode 4 to obtain an accompanying high-frequency output at an output terminal 6. The SAW element 2 is covered with a metallic can 10 with the buffer material 9 of the SAW element between; and a small-sized battery 11 as a power source and the transmitting circuit 12 which sends out the output of the element 2 are provided in the can, and an FM antenna 13 is provided externally. Consequently, the size reduction and simplification of the sending circuit are attained and the convenience of use is realized.
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