| 摘要 |
PROBLEM TO BE SOLVED: To reduce number of part items and assembling man-hours, while maintaining watertightness. SOLUTION: A circuit board 27 constituting a normal lamp lighting circuit 24 and a circuit board 28, constituting an emergency lamp lighting circuit 25, are integrally fixed on a circuit board base 26 by bolts 35 and nuts 36. The circuit boards 27, 28 are connected together by lead wires 31. The circuit board base 26 is stored in a lighting device case 23 and sealed by packings 41, 42. Since the inside of the case 23 is kept watertight, no shielding work is required for the lead wires 31, and the number of part items and assembling man-hours can be reduced. |
