| 摘要 |
PURPOSE: A multipurpose buzzer is provided to additionally install the second magnet on the center of a yoke to insert the second magnet to an inner space between the first magnet and a yoke pad, to increase the number of magnetic force lines of the first and the second magnets for a coil, so as to magnify a force on the coil. CONSTITUTION: A cylinder-shaped case(9) forms a buzzer sound output opening(7) on the side. A coil(2) is rolled on a lower center of a vibration plate(1) set on the top of the case(9), and is excited by power from an exterior. A spring(8) sequentially accumulates a yoke(6), the first magnet(5), and a yoke pad(4) on the top thereof, and is firmly installed on a lower end of the case(9) by a base(10). The second magnet(16) is additionally installed on the center of the yoke(6), to be inserted into an inner space of the first magnet(5), the yoke pad(4), and the coil(2).
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