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Method and system for reticle inspection by photolithography simulation

  • US 6,466,315 B1
  • Filed: 09/03/1999
  • Issued: 10/15/2002
  • Est. Priority Date: 09/03/1999
  • Status: Expired due to Term
First Claim
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1. A system for automatic optical inspection of a photolithography substrate to be used in a selected photolithography exposure tool operating with a selected frequency of light and a selected numerical aperture and coherence of the light, and using a selected type of resist, the system comprising:

  • a light source providing a light beam;

    a scanning apparatus receiving the light beam and scanning the light beam to form a flying spot over the substrate;

    an objective optics having a defined numerical aperture;

    an illumination assembly operative to adjust said defined numerical aperture to simulate said selected numerical aperture of the exposure tool;

    a light sensor receiving light transmitted through the substrate and generating data representative thereof, and, a processor unit coupled to light sensor to be responsive to said data for analyzing it and generating data indicative of defects on the substrate.

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