Other

Nippon Kokan Kabushiki Kaisha

Fuji Toyuki Co., Ltd.

Kaoru Daigo

Tomio Yamamoto

Atushi Ohsumi

Yoshinao Yamagishi

Katsuya Yamada

An apparatus for detecting the surface flaws of a red-hot metal part includes a light source for illuminating a predetermined area on the surface of a moving red-hot metal part, an image pick-up device for picking-up the image on the metal part surface formed by the light rays from the light source, and a shutter disposed on the optical path between the light receiving surface of the pick-up device and the light source. The reflection energy from the metal part surface corresponding to the incident light rays from the light source is set up to be much larger than the radiation energy of the metal part per se. This relation of energy is set up by adjusting the illumination of the light source. The surface flaws are detected in such a manner that at least one of a series of video signals fed from the image pick-up device after the shutter release is selected as the optimum video signal for flaw detection, and properly selected.

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Fukuyama, Japan

Kaoru Daigo