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:
May. 28, 1991
Filed:
Sep. 18, 1989
Applicant:
Inventors:
Masahiro Dohi, Tokyo, JP;
Koji Nageno, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
181129 ; 381187 ;
Abstract
A headphone device includes a pair of housings each attached to a hanger and supporting a loudspeaker unit, and a headband having opposite ends to which the hangers are secured. Each housing includes a front plate to which the loudspeaker unit is attached and a main body portion preferably constructed of natural wood and enclosing the loudspeaker unit with the exception of a front surface of the loudspeaker unit. The inner surface of the main body portion of the housing includes a plurality of irregularities which prevent the generation of standing waves and scatter the housing resonant locations so as to maintain a high quality of reproduced sound.