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Illumination optical system, exposure apparatus, and exposure method

  • US 20100225895A1
  • Filed: 05/18/2010
  • Published: 09/09/2010
  • Est. Priority Date: 12/03/2002
  • Status: Abandoned Application
First Claim
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1. An illumination optical system that illuminates an irradiated surface based on linearly polarized light supplied from a light source, the illumination optical system comprising:

  • a depolarizer, which is selectively positioned between a first position in an optical path of the illumination optical system and a second position outside of the optical path, and has a crystal member whose thickness in a direction along an optical axis of the illumination optical system varies in a direction crossing the optical axis.

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