| 摘要 |
PROBLEM TO BE SOLVED: To attach a light source bulb to a reflector with high accuracy. SOLUTION: A little gap is formed between the internal circumference surface of a large diameter through hole 22 and the outer circumference surface of a guard part 12 of a discharge lamp 1, a protruding part 4 for centering is formed on the internal circumference surface of a large diameter through hole 22, and a cylinder pressing part 5 is formed with a spring 3. As a result the cylinder pressing part 5 of the spring 3 presses the cylindrical part 13 of the discharge lamp 1 towards the protruding part 4 for centering and makes the outer circumference surface of the guard 12 touch the centering protruding part 4, then the center axle of the discharge lamp 1 aligns to the optical axis and the centering of the discharge lamp 1 is achieved and the discharge bulb 1 is capable of attaching accurately to the reflector 2. |
