| 摘要 |
A laser head is provided in the vicinity of an ejection head. A laser beam radiated by the laser head reaches a substrate reflecting position on a surface of the substrate at a critical angle and is then totally reflected by the substrate toward the ejection head. After having been reflected by the substrate, the laser beam is totally reflected by a reflective surface of a nozzle plate toward the substrate. The laser beam thus reaches a radiating position on the surface of the substrate at a radiating angle (the critical angle).
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