| 摘要 |
<p>PURPOSE:To provide a lighting device for a bycycle which suppress the happening of the destruction of a circuit and the breakage of the circuit elements even in the case where a bulb is wire broken and the power generation voltage of a dynamo increases. CONSTITUTION:When the voltage of a dynamo 1 increases because of the wire breakage of a bulb 2, a PTC thermistor is put into an operation region, and the resistance of the PTC thermistor increases, and each electric current which flows in the zenor diodes ZD1 and ZD2 is suppressed. Accordingly, the burn of circuits is prevented, and the breakage of the zenor diodes ZD1 and ZD2 themselves due to heat generation of the zenor diodes ZD1 and ZD2 due to the increase of the electric current can be prevented.</p> |
