| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable exactly detecting mending tape pasted on a paper with a transmission type photoelectric sensor detecting a detecting object by transmission light. SOLUTION: PD1 is arranged on the axis of light casted from an LED, PD2 is arranged on the position other than the axis of light casted from an LED and PD3 is arranged on the position other than the line connecting PD1 and PD2. By this, the distribution shape of the transmitting light holding directivity in a paper and a thin sheet in diffusion reflection group and the distribution shape of the transmitting light having lost directivity in a mending tape can be captured, and so by comparing the two distribution shapes, exact detection of the mending tape becomes possible.</p> |
