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:
Apr. 10, 2007
Filed:
Sep. 12, 2002
Stuart Michael Nevill, Kent, GB;
Stuart Michael Nevill, Kent, GB;
B & W Loudspeakers Limited, Sussex, GB;
Abstract
A loudspeaker system includes a loudspeaker drive unit () and a rear sound absorption system () having a multiplicity of tubes connected to the rear of the loudspeaker drive unit. In one example, the rear sound absorption system () comprises a collector tube () for sound waves emerging from a passage in the magnet assembly of the loudspeaker drive unit, an annular diffuser () for sound waves coming from the back of the diaphragm (), and a disk-shaped diffuser () for second waves collected by the collector tube (). The disk-shaped diffuser () is part of a basket-like assembly () mounted on the rear of the magnet assembly (). The annular diffuser () is mounted against the wall () of the enclosure in which the loudspeaker drive unit () is mounted. The annular diffuser () includes a base portion (A) with integral upstanding vanes (B) arranged in a spiral configuration. A multiplicity of channels (C) are defined between the vanes (A), and the wall () of the enclosure closes off the open faces of the channels (C) so that they form a multiplicity of tapering tubes.