| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an LED-type signal light unit for facilitating countermeasures to the generation of the necessity of the setting of light intensity suitable for a light unit installation job site. <P>SOLUTION: This LED type signal light 10, configured to supply a power to an LED 12(light-emitting diode) which emits the rays of light for signal by rectifying a commercial power source P, is provided with a full-wave rectifying part 30 which rectifies a commercial power source P, a constant-current part 40 and a light intensity setting and adjusting part 50. The constant-current part 40 receives the output of the full-wave rectifying part 30, and impresses a reference voltage by a constant-voltage element 41 on an output semiconductor TR1, in order to supply a power to the LED 12. The light intensity setting and adjusting part 50 parallelizes the connection of selection switches S1 to S4 and resistances R1 to R4, and connects it to the bias input of the output semiconductor TR1, in order to switch the bias voltage of the output semiconductor TR1. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
