| 摘要 |
PROBLEM TO BE SOLVED: To provide compact heat removing combined filters which effectively remove a heat component in a long wavelength region including harmful IR from light emitted from a light source. SOLUTION: A long-wavelength light transmissive filter utilizing multilayer film interference is used in such a way that damage to the filter itself due to heat is not caused. A plurality of such filters are used to constitute the objective combined filters having satisfactory heat intercepting performance in a wide heat ray region.
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