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. 23, 1999
Filed:
Sep. 21, 1998
Applicant:
Inventor:
David A Norte, Westminster, CO (US);
Assignee:
Lucent Technologies Inc., Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
381396 ; 381401 ; 381412 ;
Abstract
The planar magnetic continuous-tone transducer functions as a low power, wide dynamic range speaker. The planar magnetic continuous-tone transducer uses a conventional pair of ferrite cores on which are tightly wound primary and secondary coils. A very small air gap is provided between the two ferrite cores and the secondary coil is left unterminated. The application of a voltage at a selected frequency to the primary coil induces a harmonic force in the open secondary coil, which is transmitted to the two ferrite cores. The harmonic force causes the ferrite cores to vibrate, emitting a tone from the air gap region.