| 摘要 |
An ink droplet detecting apparatus for use in conjunction with an ink-on-demand jet printer having a nozzle is provided. A first electrode is disposed at a predetermined position spaced from and facing the nozzle. A second electrode is positioned so that an ink droplet following a correct path will reach the first electrode and change the impedance value between the first and second electrodes. This change in impedance is detected and used in determining the presence of correct ink droplet path. The second electrode may be either positioned facing the nozzle in spaced adjacent relation to the first electrode or within the ink path upstream of the nozzle.
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