Defect inspection system
First Claim
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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Abstract
A defect inspection system which inspects the defects on an object to be inspected by photosensing the inspected object with a monochrome television camera. A pair of detection circuits are provided which receive such image signal corresponding to the inspected object from the television camera and have different sensitivities so that both or only one of the pair outputs a signal in accordance with the rate of change of the image signal level with respect to time. Both of the outputs from the pair of detection circuits are supplied to a mixer circuit. In this case, the mixer circuit is so formed that it will only output a defect detection signal when only one of the above mentioned pair of detection circuits shall output a signal.
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Citations
6 Claims
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1. A defect inspection system comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification