| 摘要 |
PROBLEM TO BE SOLVED: To attain weight saving of a heat sink and an LED substrate, and facilitate a step of assembling the heat sink and the LED substrate, in a bulb type LED lamp.SOLUTION: An LED lamp has a mouthpiece, an LED substrate having a polygonal cross section and formed into a cylindrical shape, and an LED element mounted on the outside of the LED substrate. The LED substrate is arranged along a center axial line of the lamp passing through the mouthpiece, and may be formed by folding a sheet of rectangular substrate along a folding part.SELECTED DRAWING: Figure 5 |
