| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent discharge or lighting of an incompatible lamp even when the incompatible lamp is erroneously inserted which has the same shell outer diameter as that of a compatible HID lamp and which has a smaller distance from one end face of the shell to a metal terminal than the distance of the compatible HID lamp. <P>SOLUTION: An insulation spacer 6 is housed between a center contact piece 41 and a lamp holder 40 of the outer shell 7 into which the compatible HID lamp is inserted that is equipped with a base having a shell, an insulation part, and a metal terminal. An inner diameter of the insulation spacer 6 is set to a size which is capable of inserting the insulation part, and in which a part of a lower face of the shell of the incompatible lamp is in contact with the insulation spacer 6. A distance from a site where the part of the lower face of the shell of the incompatible lamp is in contact with to the center contact piece 41 is longer than a distance from the lower face of the shell to the metal terminal in the incompatible lamp, and not more than a distance from the lower face of the shell to the metal terminal in the compatible HID lamp. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
