| 摘要 |
PURPOSE:To enhance the detection accuracy of the printing register mark of an automatic register device by widely detecting the density of the printing register mark provided to a web by efficiently detecting irregular reflected light and regular reflected light in the automatic register device and reducing the error of a detection position caused by the density of the printing register mark. CONSTITUTION:A printing register mark detector is equipped with an optical system constituted so that the light emitted from a light source is 1 is condensed by a projection lens 2 and throttled by an iris 12 to be projected on the printing register mark provided to a web 6 and regular reflected light is condensed by an oval light detection lens 11 to be detected by a light detection element 7 and an optical system constituted so that the light emitted from the other light source 1 is condensed by the oval light detection lens 11 to be projected on the printing register mark provided to the web 6 and irregular reflected light is condensed by the oval light detection lens 11 to be detected by the light detection element 7. |
