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:
Jan. 13, 2004
Filed:
Oct. 30, 2001
Jason Kemmerer, Thousand Oaks, CA (US);
Alpine Electronics, Inc., Tokyo, JP;
Abstract
A loudspeaker having an improved air cooling system. The loudspeaker includes a speaker frame, a diaphragm connected to the speaker frame, a voice coil which is formed on a voice coil bobbin and is connected to the diaphragm for vibrating the diaphragm, a permanent magnet having a central opening, a pole piece disposed coaxially within the central opening of the permanent magnet to form an air gap into which the voice coil is disposed, and a heat transfer plate disposed over the permanent magnet. The heat transfer plate has a plurality of cooling fins which are radially outwardly extending toward an outer rim thereof and inner and outer air openings on the outer rim. The outer rim has a step like shape in cross section and has a flat upper surface which is higher than top ends of the cooling fins. The vibration of the diaphragm produces air flows through air passages on the heat transfer plate between the inside and outside of the loudspeaker.