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. 24, 1984
Filed:
May. 20, 1981
Takashi Oyaba, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
An improved ribbon-type speaker having an independent magnetic circuit unit and vibration system assembly to thereby reduce second harmonic wave distortion and to provide a speaker which is easy to assemble and disassemble. The case of the magnetic circuit unit can be used as a jig in assembling the magnetic circuit thereby largely reducing the number of steps and the number of tools needed in assembly. The ribbon-type speaker further incorporates advantageously recess portions in a supporting frame of the vibration system assembly together with semicircular cut-out portions provided at both ends of long sides of the opening in the supporting frame. The rigidity of the vibrating plate is thus enhanced and the deformation and elongation of the damper member of the vibration system assembly is reduced.