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:
Mar. 05, 2002
Filed:
Jul. 07, 2000
Thomas Hahn-Jose, St. Ingbert, DE;
Abstract
An acoustic transducer, especially an air transducer, including a piezoceramic disk ( ). The object of the invention is to provide an improved transducer of this type for more efficiently converting electromagnetic waves into mechanical waves and vice versa. To this end, a combination of a piezoceramic disk ( ) and a membrane ( ) is provided, the membrane being configured as a monomorphic flexural resonator and being composed of an epoxy-hollow glass sphere mixture or of a material which is similar in terms of its acoustic properties. The planar vibration mode ( ) in the piezoceramic is converted into a thickness vibration ( ) using Poisson's ratio. After the conversion, this thickness vibration is then adapted to the propagation medium, especially air, by a coupling layer having a low acoustic impedance.