Patent ID: 6975464
Filing Date: 2005-12-13
Classification: F21V,G02B

Abstract:
1. A diaphragm device for light source light adjustment comprising: two base plates disposed in the vicinity of the light source, each of which having an aperture for an optical path, an accommodating chamber being formed therebetween, and one of which being disposed adjacently to a light source; and two stopping-down blades that are disposed in the accommodating chamber and move toward or away from the apertures by relatively reciprocating so as to restrict the sizes of diaphragm apertures by aperture restricting edges thereof, wherein at least the adjacent-to-the-light-source surface of the base plate disposed adjacently to the light source and the adjacent-to-the-light-source surface of a member exposed to the light of the light source are provided with gray or white heat-resistant painting, the member being mounted on the base plate disposed adjacently to the light source.