| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting system with which durability is ensured, and a change in color temperature relative to a change in an amount of light is small and, moreover, fluctuation in an amount of light is also small. SOLUTION: To adjust an amount of light emitted from the lighting system, an ND filter device 10 having a plurality of ND filters 11 is used. The ND filter 11 has: a metal film filter section 12 having a thin film of inconel alloy; and a correction filter section 15 that is substantially equal to a metal film filter section 12 in the absolute value of the ability to convert color temperature but opposite to the metal film filter section 12 in the positive/negative sign of the absolute value. COPYRIGHT: (C)2006,JPO&NCIPI
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