| 摘要 |
A metal surface inspection device which does not perform excessive detection of a harmless flaw, for example, a gloss mark. This task is achieved by providing a first discrimination portion which compares a difference value and a predetermined threshold value for discriminating the presence of a defect on an inspectable surface. This discriminated result is "provisional" and a final discrimination result is obtained by the operation of a second discrimination portion. Here, among the discriminated results of the first discrimination portion, the discrimination duration time corresponding to a harmful flaw is shorter and to the contrary the discrimination duration time corresponding to a harmless flaw is longer. Consequently, the difference between a harmful flaw and a harmless flaw are distinguishable by adjusting a discrimination reference value in the second discrimination portion.
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