| 摘要 |
PROBLEM TO BE SOLVED: To provide a light quantity adjusting device for a projector free from deformation/discoloration by heat, accurately opened/closed around an optical path aperture and making operating sound when it is opened/closed low. SOLUTION: The light quantity adjusting device is equipped with: a substrate arranged on the optical path of irradiating light from a light source and having the optical path aperture; at least one blade member arranged at the optical path aperture and attached to the substrate to freely move openably/closably; a projection type guiding member provided on the substrate and guiding the opening/closing operation of the blade member; a driving means for openably/closably moving the blade member; and a pin type transmission member coupling the driving means and the blade member. The blade member is constituted of first and second metallic plates superposed each other and having different heat conductivity, and the first metallic plate having the high heat conductivity is positioned on the light source side of the optical path aperture and has an aperture edge to regulate passing light quantity. An engaging groove fit to the guiding member and the transmission member respectively is formed on the second metallic plate having the low heat conductivity. COPYRIGHT: (C)2007,JPO&INPIT
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