| 摘要 |
PROBLEM TO BE SOLVED: To previously remove defective printing processing in the finish proof reading of gravure printing or a product process. SOLUTION: A reversal reflection type dark image electronic detector comprises a seven-color image pickup machine, a seven-detection printing ring shape, electron scanner, cathode ray tube or an automatic on-off cathode ray tube, a printing film during advance is continuously photographed in a stationary state, and the defective place of the printing film is detected to be removed.
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