| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a lighting system constituting an inexpensive, high- performance constant-current or a constant-voltage circuit by a simple DC power source and a resistor, a Zener diode and a heat sensitive resistance element for temperature compensation or the like and stabilizing luminance or luminescent color with respect to power supply fluctuations or temperature changes. SOLUTION: This device is constituted by connecting both ends of a constant voltage circuit 2, comprising a cathode side of a Zener diode DZ1 to one end of a resistor R1 for stabilizing a voltage for a DC power supply 1 that rectifies and smoothens an AC power supply, connecting both ends of a constant voltage circuit 3, made of a Zener diode DZ2 with its Zener voltage smaller than that of the Zener diode DZ1 to both ends of the Zener diode DZ1 for stabilizing a voltage at two steps, and connecting a lamp 4 to both ends of the Zener diode DZ2 of the constant voltage circuit 3 through a heat sensitive resistance element for temperature compensation for restricting fluctuation of a lamp current I, due to adjustment of the lamp current I or temperature change.</p> |
