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:
Dec. 30, 1997
Filed:
Jul. 18, 1996
Applicant:
Inventor:
Stefan Geisenberger, Straubing, DE;
Assignee:
Nokia Technology GmbH, Pforzheim, DE;
Primary Examiner:
Int. Cl.
CPC ...
F01N / ;
U.S. Cl.
CPC ...
181206 ; 381 71 ;
Abstract
An area between a gas exhaust pipe (23) and the front side (26) of a diaphragm (14) near the magnet system (11) is closed off by means of a corrugated cover (27). The presence of the cover (27) prevents acoustic short circuits between the front side (26) and a rear side (28) of the diaphragm (14). Since furthermore the end of the gas exhaust pipe (23, 23'), which protrudes into a space (25), does not reach the end of the diaphragm (14) which is connected with a bead (31), such a loudspeaker (10) can operate at very low continuous output.