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Defect inspection system

  • US 4,302,773 A
  • Filed: 02/14/1980
  • Issued: 11/24/1981
  • Est. Priority Date: 02/20/1979
  • Status: Expired due to Term
First Claim
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1. A defect inspection system comprising:

  • (a) pick-up means for sensing an object to be inspected and to produce a video signal thereof;

    (b) a plurality of detecting means each having respective predetermined detecting sensitivities connected in parallel to said pick-up means to simultaneously receive the video signals therefrom said, detecting sensitivities of said plurality of detecting means being so selected that all or some of said plurality of detecting means produce signals in response to a the rate of level change of said video signal with respect to time; and

    (c) means connected simultaneously to outputs of each of said plurality of detecting means for producing a defect detection signal when at least some of said plurality of detecting means produce a signal.

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