| 摘要 |
PROBLEM TO BE SOLVED: To invariably keep a lamp at the cloudless state while it is lighted by surely generating a convection current at the portions liable to be clouded, and increasing the temperature higher than the dew point. SOLUTION: A transparent front cover 6 is provided on the front face of a lamp housing 2, and a lamp chamber 8 having a bulb 10 is stored inside. The lamp housing 2 is partitioned into a front chamber 20 and a rear chamber 22 by an inner panel 18. Portions P1 , P2 liable to be clouded of the front chamber 20 are connected to the lamp chamber 8 by pipe-like communicating paths 24, 26, and the high-temperature air in the lamp chamber 8 is fed to the portions P1 , P2 liable to be clouded regardless of the ambient environment. |
