| 摘要 |
PROBLEM TO BE SOLVED: To expand the transmission path of heat from circuit parts and LED and prolong the life, by providing a heat sink connecting to a case and a heat conductive rubber with a small light reflection coefficient between circuit parts and LED, and printed board. SOLUTION: Between a heat sink 15 and printed board 6 on the surface of the printed board 6 for mounting circuit parts 7 and LED 8, a heat conductive rubber 26 which a small light reflection coefficient is fixed with screws 12. The heat of the circuit parts 7 and the LED 8 mounted on the printed board 6 is conducted thorough the heat conduction rubber 26 and the heat sink 15 and form the heat sink to the case 1 and finally radiated from the case 1 and a cover 3 to the air. By this, the conduction path of heat form the circuit parts 7 and the LED 8 is expanded so that temperature rise is suppressed and life is prolonged. The emission from the LED 8 does not penetrate a window glass 2 at all and reflects partly at the window glass 2 and so random reflection in the case 1 is prevented by the heat conduction rubber 16. |
