Title:
TRANSMITTER FOR ULTRASONIC WAVE EMITTER
Document Type and Number:
WIPO Patent Application WO/1999/038027
Kind Code:
A1
Abstract:
In order to measure the depth or detect a shoal of fish under the sea water or under the water, ultrasonic wave is conventionally used, and a ceramic vibrator which utilizes the principle of electrostriction is used as an ultrasonic wave emitter in many cases. An ultrasonic wave emitter which has a transmitter using the ceramic vibrator and which has an improved emission efficiency is provided. A conventional ultrasonic emitter such as a so-called sounder which measures the depth to the sea bottom, a fishfinder which detects a shoal of fish emits an ultrasonic wave in one direction in the water, and a pulse wave is used. Therefore, various difficulties in using it such as avoidance of reflected waves caused by the emission in directions other than the aimed direction, etc., and hence it is very difficult to manufacture a large output sounder and fishfinder at present. Acoustic analysis of the transmitter using a ceramic vibrator has been carried out and the results of experiments which are satisfactory to some extent have been obtained. Hence a transmitter with increased output is provided based on the results.
Inventors:
ISHIDA SHIGEYASU (JP)
Application Number:
PCT/JP1998/000252
Publication Date:
July 29, 1999
Filing Date:
January 21, 1998
Export Citation:
Assignee:
ISHIDA SHIGEYASU (JP)
International Classes:
H04R1/44; G01S7/521; G10K11/00; H04R17/00; G01S7/524; G01S15/96; H04R17/08; (IPC1-7): G01S7/521; H04R1/44; H04R17/00
Foreign References:
| JPH0467899U | 1992-06-16 | |||
| JPH0511042A | 1993-01-19 | |||
| JPS6489894A | 1989-04-05 | |||
| JPS61296899A | 1986-12-27 |
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