| 摘要 |
PURPOSE:To exclude the effect of deviation of a printed surface and to make it possible to judge the minute difference on the printed surface, by arranging a plurality of light receiving elements at a specified interval, pairing light emitting elements, and arranging the light emitting elements at an equal distance on both sides of the light receiving elements, and providing rod shaped lenses. CONSTITUTION:Each lens 3 has a rod shape, or typically, has a circular cross section. The lens 13 for each light receiving element 18 is used for adjusting a field of view. The lens 13 for each light emitting element 21 is mainly used for adjusting a level. A support 14 is a block in a rectangular parallel piped shape. A through hole 14a is formed. The lens 13 is put in the hole. A plurality of the light receiving elements 18 are fixed in the central part of a printed board 20 in one line at a specified interval. For example, in the case of the printing of about A6, the elements are arranged at every interval of 10-20mm.. The light receiving elements 18 are photodiodes and paired with the light emitting elements 21 and arranged at equal distance on both sides. The light emitting elements 21 are constituted of light emitting diodes. |
