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:
Aug. 10, 2004
Filed:
May. 09, 2003
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A composite-material vibrating device includes a vibrating member, at least three reflective layers, and holding members. The vibrating member is made of material having a first acoustic impedance Z and that functions as a vibration generating source. The at least three reflective layers are made of material having a second acoustic impedance Z that is smaller than the first acoustic impedance Z , and are coupled to respective outer surfaces located along three directions of the vibrating member. The holding members are made of a material having a third acoustic impedance Z that is greater than the second acoustic impedance Z and that are coupled to surfaces opposite to the surfaces, coupled to the vibrating member, of the reflective layers. Vibrations that have propagated from the vibrating member to the reflective layers are reflected at interfaces between the reflective layers and the corresponding holding members.