Patent ID: 6567525
Filing Date: 2003-05-20
Classification: H04R

Abstract:
A supra aural headphone including an earphone, said earphone comprising:a shell body having an inside and an outside; a cushion having a front side and a back side mounted on the shell, said cushion and the inside of said shell defining an internal cavity behind the cushion, said cushion having a passageway extending therethrough so as to acoustically connect said internal cavity with a user's ear cavity when the cushion is resting on the user's ear contacting said front side while being worn by the user, the cross-sectional area of said passageway being less than that of said cushion by an amount so that the portion of said cushion surrounding the ear cavity forms a seal against the user's ear when resting on the user's ear, said internal cavity having a total volume, said total volume being larger than a volume of about 10 cubic centimeters so as to passively attenuate significantly external sound which leaks through the earphone to the user's ear cavity; and an acoustical driver constructed and arranged within said internal cavity to avoid obstructing said passageway, and wherein during use said driver is constructed and arranged to reproduce sound for the user when driven by an audio electrical signal.