| 摘要 |
An ink jet head ( 1 ), a substrate ( 13 ) receiving a liquid drop ( 2 ) discharged from the ink jet head ( 1 ), a device for irradiating or reflecting light from a nozzle hole or its vicinity of the ink jet head ( 1 ) toward the substrate ( 13 ), a position moving device ( 10 ) for controlling a relative position between the ink jet head ( 1 ) and the substrate ( 13 ), and a control device ( 9 ) for discharging a liquid from the ink jet head ( 1 ) are included. A light-receiving element ( 6 ) for recognizing a position of the ink jet head ( 1 ) is disposed behind the substrate ( 13 ), when seen from the ink jet head ( 1 ), the substrate ( 13 ) has a transparency at least to a degree that the irradiated light or the light reflected from the nozzle hole or its vicinity toward the substrate ( 13 ) enters the light-receiving element ( 6 ), and the light-receiving element ( 6 ) senses the irradiated light or the light reflected from the nozzle hole or its vicinity toward the substrate ( 13 ). Consequently, even if the distance between the ink jet head and the substrate is small, the relative position between the ink jet head and the substrate is adjusted accurately.
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