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:
May. 07, 1991
Filed:
Oct. 05, 1989
Siegfried Klein, Paris, FR;
Commissariat a l'Energie Atomique, Paris, FR;
Abstract
The invention relates to a wide passband omnidirectional loudspeaker which has particular application to high fidelity sound reproduction. The loudspeaker has a rigid, magnetostrictive, spherical diaphragm (3), a medium and high frequency electric control means connected to two terminals (4,5) located at two diametrically opposite points of the diaphragm for creating in the vicinity thereof a homogeneous magnetic field with respect to an electric signal applied to the terminals (4,5) of the control means after filtering (2) for eliminating the low frequencies, and a d.c. polarization means (11,12) for the diaphragm. The loudspeaker also has another low frequency electric control means (14) receiving the electric signal after filtering for eliminating the medium and high frequencies. This low frequency electric control means extends longitudinally along an axis (X'X) of the diaphragm and has two ends (16,17) respectively joined to two opposite zones of the diaphragm (3) traversed by axis (X'X).