| 摘要 |
<p>An optical scanner for detecting registration marks 17 printed on a sheet of labels 14 comprises a light source 23 for illuminating an inspection area and a light sensor 25 responsive to the magnitude of the light reflected therefrom, detecting means having a plurality of outputs and responsive to the light sensor for providing a plurality of parallel signals varying in number in proportion to the magnitude of light reflected from the inspection area, and a display means 31 connected to the plurality of outputs of the detecting means for providing a plurality of visible linear-array signals in response to these signals and means connected to one of the plurality of outputs for providing an output signal EDS in response to the corresponding one of the plurality of parallel signals being applied in response to a registration mark. Threshold means 30 also provides a visible signal (32) in response to EDS. <IMAGE></p> |
