| 摘要 |
PROBLEM TO BE SOLVED: To suppress deterioration of attachment/detachment workability in the case where an entire length of a straight tube LED lamp is relatively long.SOLUTION: In a holding piece 52, a display part 55 made of a substantially trapezoidal-shaped protrusion is provided protrusively from side edges of both front and back. On the other hand, in a heat radiation member 81 of a lamp 8, a linear mark 811 is formed at the center in the circumferential direction. This mark 811 is formed, for example, by coating paint on the bottom surface of a recessed groove 810 or on the surface of a portion between the recessed grooves 810 adjacent to each other. That is, as shown in Fig. 1, when the display part 55 of a support spring 5 is overlapped with the mark 811 when viewed from a radial direction of the lamp 8, the lamp 8 can be determined to be in an insertion/extraction position; thus, even when an entire length of the lamp 8 is relatively long, deterioration in attachment/detachment workability can be suppressed. |
