| 摘要 |
PROBLEM TO BE SOLVED: To provide a straight pipe LED lamp in which a length L of the straight pipe LED lamp is set without depending on a length of a glass pipe (a cylindrical pipe) 56.SOLUTION: An illumination lamp having a predetermined length L (a length L determined by specifications) includes: a glass pipe 56 (a cylindrical pipe); a heat sink 54 extending in a longitudinal direction of the glass pipe 56 (the cylindrical pipe); and a mouth piece 55 which is attached to an end part of the glass pipe 56 (the cylindrical pipe) and fixes the heat sink 54. The heat sink 54 is shorter than a length of the glass pipe 56 (the cylindrical pipe) and extends at a center part of the glass pipe 56 (the cylindrical pipe). The mouth piece 55 includes an abutted surface 76 which is inserted into the glass pipe 56 (the cylindrical part) from the end part of the glass pipe 56 (the cylindrical pipe) to be abutted with an end surface of the heat sink 54. The predetermined length L (the length L determined by the specifications) is determined by a length L3 from a mouth piece end surface 73 to the abutted surface 76 and a length L2 of the heat sink 54. |
