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:
Nov. 20, 1984
Filed:
May. 17, 1982
Joris A Nieuwendijk, Eindhoven, NL;
Wilhelmus D van Gijsel, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A ribbon-type electro-acoustic transducer has a magnet system which comprises an upper plate (2, 3) and a center pole (1) between which an air gap (8) is formed. A diaphragm (7) on which conductors (9) are arranged is disposed in the air gap. The upper plate (2, 3) comprises two plate-shaped parts (2', 3' and 2', 3' respectively) between which a space (11) is formed in which an edge portion of the diaphragm is located. This results in a more homogeneous magnetic field so that the transducer distortion may be reduced. Moreover, the transducer sensitivity is improved and is suitable for handling signals in the mid-range audio frequency spectrum. The cavity (15) enclosed by the magnet system and the diaphragm (7) can be acoustically coupled, be via an additional cavity to a (bass-reflex) duct or an additional (passive radiator) diaphragm.