Electric horn

An electric horn, comprising:

• an exciting coil that is housed in a bottom part of a closed-end tubular casing, the exciting coil being formed by winding a wire around an outer peripheral side of a tubular part of a coil bobbin;
• a fixed iron core that is fit to be fixed into an inner peripheral side of the tubular part, the fixed iron core being magnetized according to excitation of the exciting coil;
• a diaphragm that is fixed to an open end of the casing;
• a movable iron core that is provided to a shaft center part of the diaphragm, the movable iron core and the fixed iron core being placed to axially face each other;
• and
• a node member that is provided to a power supply circuit of the exciting coil;
• and
• a node contact breaker that is provided to the movable iron core so as to break a contact of the node member, wherein:
• the movable iron core moves under suction from a resting position to be closer to the fixed iron core according to a power supply to the exciting coil via the power supply circuit,
• the node contact breaker of the movable iron core breaks the contact of the node member of the power supply circuit according to the suction movement of the movable iron core, and
• the movable iron core repeats a movement toward a spaced position at a side of the resting position so as to be displaced with a predetermined amplitude between a suction position at a side of the bottom part of the casing and a spaced position at a side of the open end of the casing in order to generate a warning sound, wherein:
• a reference position is set by an end part, relative to a side of the movable iron core, of a wire-wound portion on an outer periphery of a tubular part of the exciting coil, and
• an end face, relative to a side of the fixed iron core, of the movable iron core is positioned closer to the casing bottom part side than the reference position in the suction position and closer to the casing open end side than the reference position in the spaced position.

An electric horn, comprising:

• a casing that is formed to be a closed-end tubular and has an opening part at one end and a bottom part at another end;
• a coil bobbin that has a tubular part and is located on the bottom part of the casing;
• an exciting coil that is formed by winding a wire around the tubular part of the coil bobbin;
• a fixed iron core that is located in the tubular part of the coil bobbin and magnetized by electric current that is supplied to the exciting coil;
• a lamellar diaphragm that is fixed to an open end of the casing;
• a movable iron core that is fixed to a shaft center part of the diaphragm and placed to be opposed to the fixed iron core;
• a node member that is connected to the exciting coil so as to perform an on-off control of the electric current that is supplied to the exciting coil;
• and
• a node contact breaker that is provided to the movable iron core so as to perform an on-off control of the node member, wherein:
• the following movements are repeated that:
• the movable iron core moves toward the fixed iron core when the fixed iron core is magnetized under a power distribution to the exciting coil, and
• the movable iron core moves away from the fixed iron core when the node contact breaker acts on the node member to disconnect the power distribution to the exciting coil, wherein:
• an end face of the fixed iron core that is opposed to the movable iron core is positioned to be adjacent to the movable iron core over a center of a length of a tubular part of the coil bobbin in a tube length direction.