Patent ID: 7251342
Filing Date: 2007-07-31
Classification: H04R

Abstract:
1. A single-end planar magnetic loudspeaker system comprising: at least one thin-film, flexible diaphragm having a front side and a rear side, configured for converting an input electrical signal into a corresponding acoustic output, said at least one diaphragm including a conductive material carried by the diaphragm in a predetermined conductive region and a predetermined non-conductive region and a total vibratable surface area of less than 150 sq inches; at least one high energy magnetic structure of predetermined thickness positioned adjacent to said at least one thin-film, flexible diaphragm, adjacent one but not the other of the front side and the rear side of said diaphragm so as to provide a single-ended transducer configuration, and wherein the high energy magnetic structure is at least 0.060 inches in thickness and operable to provide a speaker sensitivity of at least 85 db at a power level of one watt; and wherein said predetermined thickness does not exceed a thickness where at least a three dB increase in SPL is obtained over that which would be obtained in a structure of half said thickness, and is configured in up to seven rows of magnetic material, each of said rows having a cross sectional configuration wherein the width of the material is at least as great as the width thereof; a mounting structure configured as part of the single end planar magnetic speaker and coupled to the diaphragm to capture the diaphragm, hold it in a predetermined state of tension and space it at a predetermined distance from the high energy magnetic structure, and, the system as thus configured being operable as a single end loudspeaker system.