| 摘要 |
<p>This invention relates to a discriminative flaw detector for detecting highly accurately and at a high speed the kind, size and positions of flaws that exist on a travelling light-transmissive sheet material. An optical spot scanner (11) repeatedly scans the light-transmissive sheet material perpendicularly to the travelling direction of the material. When the optical spot is projected toward the flaws existing on the light-transmissive sheet material, the state of transmitted light, scattered transmitted light, reflected light and scattered reflected light changes depending on the kind of flaws. The changes of these rays of light are detected by an analyzer (12), converted to electrical signals by a photoelectric device (13) and further processed into flaw data by a flaw data generation circuit (14). A flaw data input circuit (15) receives the flaw data, classifies these flaw data into flaw data blocks in accordance with the kinds of flaws, thus preparing flaw patterns and reading the address of the flaw data block as position data. The flaw pattern is compared with a flaw discrimination pattern table by an information processing unit (17) to discriminate the kind and size of flaws and the position of the flaw is detected by the position data. This type of flaw detector is disposed in the production line of a light-transmissive sheet material such as a glass sheet, and the result of detection is used for the management of the production process and as a criterion for sampling.</p> |
