| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic oscillator suitable for a flow measuring instrument using highly precise sing-around measurement. SOLUTION: This oscillator is constituted of a metal cap 2 of a topped cylindrical shape having a top part and a sidewall part, a sound-matching layer 3 provided in an outer face of the top part, and a piezoelectric member 5 fixed adhesively to an inner face of the top part, an elastic body 13 is embedded between a sidewall of the piezoelectric member 5 and the cap 2, and a leading characteristic or a tailing characteristic of the ultrasonic oscillator thus gets sufficient even when used for an ultrasonic flowmeter using a sing-around method.
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