| 摘要 |
PCT No. PCT/EP93/02605 Sec. 371 Date Jun. 1, 1994 Sec. 102(e) Date Jun. 1, 1994 PCT Filed Sep. 24, 1993 PCT Pub. No. WO94/07615 PCT Pub. Date Apr. 14, 1994The sonic or ultrasonic transducer includes a circular piezo-ceramic disk capable of generating radial oscillations, and a metal ring, which embraces in tight close fitting relationship the circumferential surface area of the disk to form a radial oscillator in conjunction with the disk. The sonic or ultrasonic transducer formed in this manner has an emission surface corresponding to the entire surface area of the piezo-ceramic disk and metal ring, and displays a radial resonant frequency which is lower than that of the piezo-ceramic disk.
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