| 摘要 |
A push button switch using a metal dome is provided that can ensure stable contact between the metal dome and fixed electrodes without using a through-hole in a PCB, can maintain the stable contact even after being operated many times, and can be obtained at low cost. The push button switch includes: a central electrode to which a circuit trace is connected without using a through-hole and with which the apex of the metal dome comes into contact when the push button switch is depressed; and an annular electrode with which the outer circumference of the metal dome is in contact. These fixed electrodes are printed with a conductive ink on the PCB, and the springy metal dome is placed over these fixed electrodes. The structure of the printed layers is identical over the entire region of the annular electrode with which region the metal dome is in contact.
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