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:
Jun. 09, 2015
Filed:
Sep. 19, 2013
Tdk Corporation, Tokyo, JP;
Kaoru Kijima, Tokyo, JP;
Akira Satoh, Tokyo, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
A piezoelectric sounder for transmitting a signal by using a sound comprises a piezoelectric diaphragm constructed by attaching a piezoelectric element to a metal sheet, a ease containing the piezoelectric diaphragm and having a resonance space defined therewithin and adapted to resonate as the piezoelectric diaphragm vibrates, a pair of terminals electrically connected to the metal sheet and piezoelectric element of the piezoelectric diaphragm, while the piezoelectric sounder has no resonance points fr, fa in a frequency range of the signal. Thus removing the resonance points fr, fa from the frequency band of the signal to be transmitted prevents the signal transmission distance from shortening at the resonance points, thereby improving the stability in communications.