| 摘要 |
<p>PROBLEM TO BE SOLVED: To make it possible to detect whether an ink droplet is injected from plural nozzles at a time with a simple constitution.SOLUTION: Three metal plates 7a to 7c are arranged along a transportation direction in which plural nozzles 10 are arranged. A detection surface of the metal plates 7a to 7c has a parallelogram shape, and both side edges 32c, 32d thereof in the transportation direction are inclined with respect to the transportation direction and a vertical direction. The detection surface 31 of the metal plates 7a to 7c are respectively lapped over plural passage spaces R through which ink droplets injected from the plural nozzles 10 pass viewed from a scan direction which is made to be the transportation direction and the vertical direction. At least one end of an upper end and a lower end of plural portions 33 lapped over the plural passage spaces R of the detection surface 31 is formed by the edge 32c, 32d. A current detector 41, for detecting a current value of a flowing current, is connected to each of the metal plates 7a to 7c.</p> |
