| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a diaphragm device for light source light adjustment enabling prevention of overheat by a structure of the diaphragm device itself without any protection means of a complicated structure set between the light source and itself. <P>SOLUTION: The diaphragm device has a first bottom board 1 and a second bottom board 2 fitted with a given interval structured as a unit, with the second bottom board 2 arranged at a light source side. A blade room is structured between the two bottom boards 1, 2 with two diaphragm blades arranged. When one of them is moved by a motor, the other is moved in an opposite direction, whereby a diaphragm opening is made changed. Further, one of the diaphragm blades has two blades 21, 22, while the other has one blade 25. The second bottom board 2 and the blades 21, 22, 25 either have their light source-side face chromium-plated or are manufactured with a machinable ceramic material. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
