An electronic component that uses elastic waves that propagate along the surface of a solid. It mainly uses Rayleigh waves, the same as earthquakes. Surface acoustic waves are excited and received using interdigital electrodes formed on a piezoelectric substrate, utilizing the piezoelectric effect. The wavelength of a surface acoustic wave is about 10-5 times that of an electromagnetic wave, making the element dimensions very small. Application elements include filters, delay elements, and resonators, and are characterized by their small size, lack of adjustment, and low cost. They are used in TV receivers and various communication devices. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
個体表面を伝搬する弾性波を利用した電子部品。主に地震と同じレーリー波が使われる。弾性表面波の励振および受信は,圧電基板上に形成されたくし型電極を用い,圧電作用を利用して行なわれる。弾性表面波の波長は電磁波の約 10-5 倍であり,素子寸法は非常に小さくなる。応用素子としては,フィルタ,遅延素子,共振器などがあり,小型,無調整,安価などの特長を持つ。 TV受像機,各種通信機器などに使われている。
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