Illumination – Light source and modifier – Including selected wavelength modifier
Patent
1997-07-25
1999-05-25
Cariaso, Alan
Illumination
Light source and modifier
Including selected wavelength modifier
362 96, 362264, 362294, 362345, 95137, 95141, 96142, 2504922, F21V 900
Patent
active
059064293
ABSTRACT:
An optical illumination device reflects and condenses light from a mercury-arc lamp by a light reflecting and condensing member and then reflects and deflects the light, thereafter the reflected and deflected light is transferred to a relay-lens system through a collimator lens or input lens, band-pass filter and fly-eye lens. Gas from which impurities are removed by a filter is flown around optical elements to separate the optical elements from air containing material causing clouding of the optical elements to thereby restrain clouding of the optical elements. On the other hand, or in addition, the reflectance of the light reflecting and condensing member and/or miller for the light of the absorption band of sulfur dioxide is made small to prevent the optical elements from clouding.
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Hagiwara Shigeru
Hasegawa Shinichi
Mori Takashi
Nagatsuka Jun
Yamada Jin
Cariaso Alan
Nikon Corporation
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