| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a droplet discharging device capable of detecting the sound generated at discharging the droplet and of directly detecting the abnormal discharge of the droplet. <P>SOLUTION: A nozzle plate 51A is provided with a hollow section 130, etc. in the vicinity of a nozzle 51 and has a beam-structure with the thickness of a part of the nozzle plate getting thinner. The sound generated at the time of the ink-droplet discharged from the nozzle 51 dividing from a meniscus is made resonated with the beam structure and amplified, then the sound can be efficiently transferred to the sound detecting sensor installed in a printing head. According to detecting the sound by the above way, the failure such as non-discharging of the ink-droplet to be discharged from the nozzle 51 or its abnormal-discharge can be recognized. The inspecting sensor may be used together with a discharge piezoelectric element or be provided with a membrane-like pressure sensor. If the pressure sensor for detecting the sound with excellent acoustic-matching is provided, the sound can be detected with high sensitivity. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
