| 摘要 |
PROBLEM TO BE SOLVED: To simplify attachment of a printing quality inspection device to a printing press reducing the number of parts of the printing quality inspection device and reducing the whole shape of the inspection device and to enhance reliability or maintenance properties while reducing the cost. SOLUTION: Elements wherein two light emitting diodes of blue B and red R as well as green G and infrared IR are joined, are set as light emitting sources 2 and 3, and two light detection elements 4 and 5 using filters 6 and 7 for permitting lights of wavelengths approaching like green G and blue B as well as red R and infrared IR to pass on a light detection element side are prepared and the light emitting sources or the light detection elements are allowed to light alternately to detect four colors, that is, red R, green G, blue B and black by two light detection elements. |
