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. 30, 1995
Filed:
Feb. 01, 1994
Sony Corporation, Tokyo, JP;
Abstract
A headphone includes an electro-acoustic transducer, a housing, and first, second and third members. The electro-acoustic transducer includes a diaphragm and is supplied with a signal through a cord. The housing is shaped in such a way as to be accommodated into a concave portion of an auricle and includes an accommodating portion in which the electro-acoustic transducer is accommodated and a projecting portion for leading the cord from the inside of the housing to the outside of the housing. The accommodating portion has a first opening so that the electro-acoustic transducer is exposed to the outside from the first opening. The projecting portion is formed on the rear surface of the accommodating portion. A first member is provided so as to cover the whole surface of the diaphragm and the first opening and is made of a metal material. The first member has a plurality of first openings. A second member is provided on the first member so as to cover the first member and is made of a synthetic resin material. The second member has a plurality of second openings whose diameters are smaller than those of the first openings. A third member is attached to the housing so as to cover the housing having the second member attached at a portion in which the first opening is formed, and is made of an elastic material. The third member has a second opening which is smaller than the first opening.