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:
Dec. 09, 2014
Filed:
May. 15, 2013
Piezotech, Llc, Indianapolis, IN (US);
Frans Lautzenhiser, Zionsville, IN (US);
Fredric Bernard Grossman, Fishers, IN (US);
Michael H. Phillips, Indianapolis, IN (US);
Ramesh Janardhanam, Pardeeville, WI (US);
Piezotech, LLC, Indianapolis, IN (US);
Abstract
A buzzer includes a piezoelectric diaphragm and a housing enclosing the diaphragm and defining a resonating chamber. The chamber includes a sound port and has an optimal resonating frequency fat a temperature T defined by f=(v/2π)(√(A/vL)) were vis the velocity of sound waves in air at a temperature T, A is the effective area of the sound port, vis the volume of the resonating chamber, and L is the effective length of the sound port. A temperature compensating member moves in response to changes in temperature to change the value of √(A/voL) at a rate and in a manner that balances the change in 1/vacross that same temperature range, thereby reducing changes in the product (v/2π)(√(A/vL)) and consequently reducing any changes that would otherwise occur in facross that temperature range, thereby holding the value of fsubstantially constant across the temperature range.