| 摘要 |
<p>PURPOSE: To reduce a hot spot phenomenon generated on a projection image screen, simplify assembly process, and reduce its cost by providing the first diameter expansion part whose diameter is enlarged so that a lamp tip lead wire can penetrate through, in parallel to the hole axis at least in one part in an incorporation hole. CONSTITUTION: An incorporation hole 10 of a main part is provided in a spherical surface center part of a hemispherical concentration reflector 1, and a lamp 3 and a lamp unit 21 conprising a support insulating member 4, a base 5, etc., are incorporated in the incorporation hole 10. Two lead wires 6, 7 of the lamp unit 21 are led from the incorporation hole 10 and the first diameter expansion part 11 whose hole diameter is enlarged is provided in a part of the incorporation hole 10. The first diameter expansion part 11 of the incorporation hole 10 has a recessed groove shape and is parallel to the hole axis, the lead wire 7 in the two lead wires 6, 7, which is positioned in the tip of the lamp penetrates therethrough, and the lead wire 6 in the lamp rear end which is parallel to the lamp axial line C-C is embedded in the insulating member 4 such as a porcelain insulator, penetrates through the base 5, and is led to the outside as a covered wire.</p> |
