Horn apparatus

A horn apparatus for resonating a sound generated by a vibration of a diaphragm with a resonator provided with a main body portion having a sound passage formed into a spiral shape, the horn apparatus comprising:

• a case attached to the resonator;
• a coil provided in the case;
• a fixed iron core disposed at a center of the coil and fixed to the case;
• a movable iron core opposed to the fixed iron core, fixed to the diaphragm, wherein when electric power is supplied to the coil, the movable iron core is attracted to the fixed iron core so as to vibrate the diaphragm;
• a partition wall member provided between the diaphragm and a main body portion of the resonator;
• a through-hole provided in the partition wall member and coaxial with the movable iron core;
• and
• an air flow channel formed into an annular shape by an outer peripheral portion of the movable iron core and an inner peripheral portion of the through-hole, air flow being caused in the air flow channel by the vibration of the diaphragm,
• wherein at least one of the outer peripheral portion of the movable iron core and the inner peripheral portion of the through-hole is an inclined surface having a diameter which is gradually reduced with distance from the diaphragm in an axial direction of the movable iron core.