| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a stop lamp capable of restraining current flowing in LEDs connected in parallel to the minimum even when a severance of wire occurs, approximately uniforming lightness even when LEDs with different Vf values are connected in parallel, and fixing any number of LEDs. <P>SOLUTION: A circuit of this stop lamp 1 constitutes a two-series-and-three-parallel light emitting part to which six grid-shaped units connected with LEDs DL1-DL6 and resistances R1-R6 one by one in series are connected. Thereby, for example, even when the LED DL2 is broken, increase of current flowing in the LED DL1 can be restrained to the minimum, and even when LEDs with dispersion of forward voltage are connected in parallel, difference of current flowing in the respective LEDs can be very small, and accordingly difference of lightness is very small. Resistances are arranged on the respective units, and number of LEDs can be freely changed by removing the LEDs and connecting them directly. <P>COPYRIGHT: (C)2004,JPO |
