Title:
WAVE TRANSMITTER/RECEIVER CAPABLE OF EMITTING A PLURALITY OF FREQUENCIES
Document Type and Number:
WIPO Patent Application WO/2002/047432
Kind Code:
A1
Abstract:
Ultrasonic wave has conventionally been used in depth measuring or fish detecting in water, and a ceramic vibrator based on a piezo-effect principle is very often used as a device for emitting this ultrasonic wave. A ultrasonic wave emitting-wave transmitter/receiver by a ceramic vibrator based on this piezo principle and having a better emission efficiency than before. Almost all the ceramic vibrator-based ultrasonic vibrators currently available use one frequency as a frequency that can be efficiently emitted from one vibrator, because a ceramic vibrator has only one portion where the most efficient natural oscillation frequency is available. Improvement has been made so that a second natural oscillation frequency offered by a combination of a ceramic vibrator and a steel block is available, in addition to the best natural oscillation frequency provided by a ceramic vibrator, to coexist with the ceramic vibrator's natural oscillation frequency, whereby the improvement is such that two ultrasonic wave frequencies can be used with only one vibrator.
Inventors:
ISIDA SIGEYASU (JP)
Application Number:
PCT/JP2001/010560
Publication Date:
June 13, 2002
Filing Date:
December 03, 2001
Export Citation:
Assignee:
ISIDA SIGEYASU (JP)
International Classes:
H04R1/44; B06B1/06; G01S7/521; (IPC1-7): H04R1/44; G01S7/52
Foreign References:
| JPS58170200A | 1983-10-06 | |||
| JPS6313497A | 1988-01-20 | |||
| JPH05137189A | 1993-06-01 | |||
| JPH10174189A | 1998-06-26 |
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