| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent thermal deterioration of an infrared light transmission filter. <P>SOLUTION: A first reflector 2 is formed by making the position of its front opening end 2b generally coincident with the arrangement position of a shade 4; a second reflector 7 is arranged so as to cover an area between the front opening end 2b of the first reflector 2 and a projection lens 5; and an outside opening 8 formed between the second reflector 7 and the projection lens 5 is covered with the infrared light transmission filter 9. Reflection light L1 reflected on a second reflecting surface 7a of the second reflector 7 becomes infrared light L2 and is emitted frontward through the infrared light transmission filter 9. Thereby, the setting position of the infrared light transmission filter 9 can be set at a position where it is prevented from easily receiving a thermal influence due to convergence of light of a light source 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
