| 摘要 |
PROBLEM TO BE SOLVED: To reduce deterioration in the life of a light source lamp due to infrared rays. SOLUTION: A lens array 200 is arranged on the optical path of the projection light emitted by a light source part 100 so that the curved lens surface of the lens array 200 is an incidence surface for the light. On the curved lens surface of the lens array 200, at least a filter FIR which cuts off infrared rays is formed. The infrared rays IR emitted by the light source part 100 are reflected radially by the filter FIR, then infrared rays IRR which are made incident again on a light source lamp 101 are reduced to some extent to reduce the breakage, deformation, white turbidity, etc., of the light source lamp 101 due to a rise in the temperature of the light source lamp 101. |
