Canal type handset for earpiece and canal type handset which uses it, as well as the stethoscope and hearing aids using the canal type handset

摘要

An object of this invention is to provide a canal-type receiver capable of reproducing sound fields spanning front-to-rear and/or top-to-bottom. Thus, an ear piece of the canal-type receiver has a substantially cylindrical shape and includes a cylindrical portion including a sound guiding tube emitting a sound wave, radiated from a sound-emission unit in a receiver, to the inside of the external auditory canal, the sound guiding tube is configured so that a directional sound wave radiation axis of the sound wave faces a predetermined position of a wall of the external auditory canal in such a state that a cylindrical portion of the ear piece is mounted at a predetermined position in the external auditory canal, whereby the sound wave radiated from the sound guiding tube is reflected by a portion of the external auditory canal wall to arrive at the eardrum.