Loudspeaker, inner-ear headphone including loudspeaker, and hearing aid including loudspeaker

摘要

A loudspeaker includes: a frame; a yoke fixed to the frame; a magnet fixed to the yoke; a plate fixed to an upper surface of the magnet which is opposite to a surface of the magnet which is fixed to the yoke; a vibratable voice coil arranged in a first magnetic gap formed between the yoke and the plate; a diaphragm having an outer-edge portion joined to the voice coil; and a support member supporting the diaphragm in a vibratable manner, and composed of edges, one end of each edge being fixed to the frame. The plate is composed of: a flat-plate part fixed to the upper surface of the magnet, and having, at an upper surface thereof, a planar portion extending from the outer-edge portion up to a predetermined distance; and a protruding part disposed on the flat-plate part excluding the planar portion, and protruding toward the diaphragm.

主权项

1. A loudspeaker, comprising:
a frame; a yoke fixed to the frame; a magnet fixed to the yoke; a plate fixed to an upper surface of the magnet, the upper surface being opposite to a surface of the magnet which is fixed to the yoke; a voice coil arranged, in a vibratable manner, in a first magnetic gap formed between the yoke and the plate; a diaphragm having an outer edge portion joined to the voice coil; a support member which supports the diaphragm in a vibratable manner, and includes a plurality of edges, one end of each of the edges being fixed to the frame, and a magnetic fluid disposed between the plate and the voice coil, wherein the plate comprises
a flat-plate part which is fixed to the upper surface of the magnet, and has, at an upper surface thereof, a planar portion extending from the outer edge portion up to a predetermined distance, anda protruding part which is disposed on the flat-plate part excluding the planar portion, and protrudes toward the diaphragm, a through-hole is formed so as to penetrate through the yoke, the magnet, and the plate, the through-hole connecting a space outside the loudspeaker with a space at a back surface of the diaphragm, and the protruding part is arranged extending into the through-hole so as to fix the yoke, the magnet, and the plate.