| 摘要 |
PURPOSE: A magnetic buzzer, whose diaphragm's amplitude becomes twice that of the conventional buzzer, is provided to remarkably the sound of the buzzer. CONSTITUTION: A magnetic buzzer is constructed in such a manner that a signaling sound output hole(71) is made in one side of the center portion of a support ring case(27) that is configured in a manner that a support ring(20) and a case(70) are integrally formed, and a negative input voltage of 0V to peak voltage is applied to a coil(40). Accordingly, the signaling sound output hole is formed in an appropriate position even when the case's height is lowered, to remarkably reduce the height of the buzzer. Also, even if a plastic cap(80) covers the case, a gap between the cap and a diaphragm(60) is minimized without affecting the output of signaling sound, to decrease the size of the buzzer.
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