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Pattern transfer mask, mask inspection method and a mask inspection apparatus

  • US 5,923,034 A
  • Filed: 10/15/1997
  • Issued: 07/13/1999
  • Est. Priority Date: 01/07/1997
  • Status: Expired due to Fees
First Claim
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1. A mask inspection apparatus comprising:

  • a charged particle beam generating source for irradiating a charged particle beam;

    a shaped mask for shaping the charged particle beam to generate a shaped charged particle beam, the shaped charged particle beam being applied onto a mask formed with a pattern;

    an electron lens for electro-optically magnifying an electro-optic mask image transmitted through the mask;

    a fluorescent screen for converting the magnified electro-optic mask image to an optical mask image;

    optically magnifying means for optically magnifying the optical mask image;

    a camera for detecting a magnified optical mask image to obtain an image signal; and

    means for inspecting the pattern for a defect on the basis of the image signal.

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