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Defect detection device and defect observation device

  • US 10,642,164 B2
  • Filed: 09/25/2017
  • Issued: 05/05/2020
  • Est. Priority Date: 09/26/2016
  • Status: Active Grant
First Claim
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1. A defect detection device comprising:

  • an illumination system that includesa condenser lens; and

    a plurality of laser light beam sources each including a beam forming system; and

    a combination wavelength plate having a fractional wavelength portion and a dummy portion,wherein the condenser lens condenses a plurality of light beams which are emitted onto a sample and have substantially a same wavelength and substantially a same polarization direction on the sample,wherein the plurality of beam forming systems brings the plurality of light beams closer to each other and causes the light beams to have light paths parallel to an optical axis of the condenser lens, andwherein the combination wavelength plate is arranged so that a first of said plurality of light beams passes through the dummy portion, and a second of said plurality of light beams passes through the fractional wavelength portion and is converted to said substantially same polarization direction; and

    a detector that detects scattered light generated on the sample by the illumination system.

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