LIGHT SOURCE FILAMENT FOR LED BULB AND FILAMENT TYPE LED BULB

摘要

To increase luminance of a light source filament 10 and illuminance of a filament type LED bulb 20 without impairing durability.SOLUTION: An aluminum material is used for a material of a substrate 11 in which an LED chip row 15 is mounted. The heat generated when lighting the LED chip row 15 can be discharged through the substrate 11 made of aluminum. Therefore, by strengthening a drive current of the LED chip row 15, the luminance of the LED chip row 15 can be increased. Accordingly, the illuminance of the filament type LED bulb 20 in which this filament 10 is used in the light source can be increased. By twisting the substrate 11, a light emitting surface where the LED chip row 15 is formed is extended in a spiral manner from one end side to the other end side of the substrate. Since the emission direction of the light of the LED chip row 15 is not restricted to one direction, it can be prevented that the illumination effect is impaired by the shadow of the filament 10 when lighting the filament type LED bulb 20.SELECTED DRAWING: Figure 1