| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a rheostat which can regulate the brightness of a lighting automatically in conformity with a circumferential conduction without increasing the number of part items. SOLUTION: The rheostat is provided with a transistor 16 for lighting a lamp 15 for dimming by the supply of a current from a battery VB and a control circuit 14 for inputting an operation signal based on the operation of a light control switch 2 for lighting a tail lamp 3, a low beam head lamp 5 and a high beam head lamp 6 and a switch 4 for switching the low beam head lamp 5 or the high beam head lamp 6 and judging a circumferncial condition based on the operation signal and also controlling the transistor 16 to regulate the brightness of the lamp 15 for dimming based on the judgment.</p> |
