The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 31, 2007
Filed:
Jun. 30, 2005
Hiroshi Shiba, Tokyo, JP;
Hiroshi Shiba, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
The present invention achieves the wideband operation of a bolted Langevin-type echo sounder transducer by enabling low frequency operation with securing a sound pressure level above a certain level without changing the external dimensions of the echo sounder transducer. This is an echo sounder transducer includes a Langevin-type vibrator having a front mass and a rear mass, and a cylindrical active vibrator which is sandwiched between the front mass and rear mass, a bend vibrator constituted of a diaphragm arranged in an acoustic radiation surface section of the front mass of the Langevin-type vibrator, and a disc type active vibrator fixed to the diaphragm. This has such structure that a slit, communicating from an outer peripheral side face toward an axial center, is provided on the circumference in the side of the lower portion of the front mass of the Langevin-type vibrator toward the rear mass.