| 摘要 |
PROBLEM TO BE SOLVED: To provide a sensor having light receiving sensitivity and resolving power improved by a simple structure. SOLUTION: This sensor for print inspection has a plurality of light receiving elements in the direction crossing the feed direction of a printing surface and receives reflected light from the printing surface via an optical lens. A light receiving region on the printing surface is partitioned into a plurality of channels. Partition lines are crossed obliquely in the flow direction of the printing surface, and sorted into light receiving parts of even channels and light receiving parts of odd channels, thereby allowing detection. Each light receiving part is provided with a mask having a through hole corresponding to the partition channel, a light receiving range of each light receiving element is defined via the mask, a light scattering apparatus is disposed on an image forming surface of the lens on the light receiving axis penetrating through the mask, and scattering reflected light can be radiated on the light receiving surface of the light receiving element via the light scattering apparatus. The light receiving element is shifted from the light receiving axis. |
