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. 03, 2003
Filed:
Nov. 17, 2000
Jason N. Linse, Portland, OR (US);
Logitech Europe S.A., Romanel-sur-Morges, CH;
Abstract
An economical and compact flat panel loudspeaker is disclosed that effectively dampens undesirable standing waves that form in the diaphragm without adversely affecting the frequency response. The diaphragm is preferably anisotropic, and has at least one compliant compressed dampening member transposed between it and a substantially planar support. The dampening member is preferably positioned at or near at least one mode of constructive or destructive interference on the diaphragm, and urges the diaphragm away from the planar support, thereby placing as light bending force on the diaphragm, and a slight compression force on the dampening member. Accordingly, the dampening member serves as a sink for transferring undesirable standing waves from the diaphragm to the planar support. In a preferred embodiment, the dampening member is an elongated strip of compliant foam rigidly secured to the diaphragm and planar support and extending through a plurality of modes on the diaphragm. The loudspeaker can include a plurality of dampeners with each dampener having different compliance characteristics. Alternatively, one or more dampeners can have layers of different compliance.