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:
Apr. 11, 1989
Filed:
Jun. 20, 1988
Applicant:
Inventors:
Fumio Murayama, Yamagata, JP;
Mitsuyoshi Matsuda, Yamagata, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R / ; H04R / ; H04R / ;
U.S. Cl.
CPC ...
381192 ; 381182 ; 381188 ; 381189 ;
Abstract
A coaxial speaker includes a low-frequency band speaker diaphragm which supports, at its inner periphery, a dust-proof member for the speaker core, via a step portion located on the diaphragm at this location. The step portion is planar and generally perpendicular to the speaker bobbin, and may be either a continuous ring or a series of discrete steps arrayed circularly.