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:
Jul. 27, 1982
Filed:
Mar. 14, 1980
Gunter Steinle, Monchweiler, DE;
Edwin Lassle, Langenau, DE;
Dual Gebruder Steidinger GmbH & Co., St. Georgen, DE;
Abstract
An electrodynamic loudspeaker having a cone diaphragm within which there is arranged a centrally located body which influences the acoustic radiation. This body is formed by an extension of the magnet core of the moving coil which extension is enlarged in the region of the mouth of the cone to form a partial covering of the cone chamber up to about half of the diameter of the cone mouth. The central part of the covering is approximately equal to one and a half times the diameter of the magnet core and forms a closed surface. In the remaining edge area of the covering there are axially arranged passages, the cross-sections of which occupy approximately one-half of this edge area. An electrodynamic loudspeaker with a cone diaphragm also has a support of the moving coil which extends beyond its point of attachment to the diaphragm up into the space within the cone diaphragm and with the end of this extension dips into a cap-shaped part which is secured fixedly to the loudspeaker while retaining a slight radial clearance therebetween.