| 摘要 |
PROBLEM TO BE SOLVED: To efficiently increase the quantities of light of plural exposure lamps. SOLUTION: A first runner 5 is provided with two exposure lamps 3a and 3b composed of fluorescent tubes for exposing an original. The exposure lamp 3a having the strong output of blue system on the side of short wavelength is used and mainly, and the exposure lamp 3b having strong output mainly of red system on the side of long wavelength is used.
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