Patent ID: 9210495
Filing Date: 2015-12-08
Classification: H04R

Abstract:
1. A dynamic headphone comprising: a headphone unit including: a diaphragm including a voice coil; a magnetic circuit portion including a magnetic gap in which the voice coil is placed; and a unit frame that supports the diaphragm and the magnetic circuit portion; a headphone case that houses the headphone unit therein, and includes a back air chamber forming portion forming a back air chamber having a predetermined volume on a back side of the headphone unit, and a mount portion integrally provided to an opening end of the back air chamber forming portion, the headphone unit being mounted in the mount portion, wherein the mount portion includes a cylindrical portion having a diameter larger than that of the unit frame, and an engagement portion bent inward from a front end of the cylindrical portion to face a peripheral edge part of the unit frame; an ear pad that is provided to an outer peripheral edge part of the headphone case and adapted to surround an ear of a wearer on a sound emitting surface side of the headphone unit, the ear pad being adapted to form a front air chamber having a predetermined volume between the ear and a front side of the headphone unit when the dynamic headphone is fitted over the ear of the wearer; an acoustic channel provided between the mount portion and the headphone unit, extending along inner surfaces of the engagement portion and the cylindrical portion to acoustically connect the front air chamber and the back air chamber to each other; and an acoustic resistance material provided in the acoustic channel.