| 摘要 |
An ink jet printer includes a recording head having nozzles for jetting ink onto a recording medium, an intermediate tank for temporarily storing ink in a lower position of the recording head, and an ink supply line for feeding the ink between the intermediate tank and the recording head, wherein when a viscosity of the ink is mu and pressure loss which allows the ink to be stably jetted is h, a length L and a diameter d of the ink supply line satisfy an inequality: (2.823x10<SUP>9</SUP>xd<SUP>4</SUP>)/L>mu/h.
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