| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem of a lighting fixture using an LED as a light source that although an LED housing section is sealed by means of a rubber packing, or the like, and thereby liquid does not infiltrate, corrosive gas passes through the rubber packing, and the exposed copper foil part of the LED and a printed circuit board is corroded by the corrosive gas, thus shortening the life.SOLUTION: In order to solve the problem of short life of an LED lighting fixture due to corrosion by a corrosive gas, an LED having a gold-plated electrode or an LED having a silver-plated electrode and an electrode part coated with silicon is used. The pattern copper foil part of a printed circuit board, to which an LED is attached, is entirely gold-plated, or only the copper foil part of the printed circuit board pattern where an LED is soldered is gold-plated, and other parts are coated with resin nor corroded by corrosive gas.SELECTED DRAWING: Figure 1 |
