| 摘要 |
PURPOSE:To allow no faulty phase due to disturbance to be decided as an optimum phase by deciding that an optimum phase cannot be obtained when the electric charging of ink particles in a phase of more than prearranged range has been detected. CONSTITUTION:If it is assumed that the ink is cut at a timing of A point, the droplets are not electrically charged at phases 0-3 of retrieval pulse, but are charged at phases 4, 5. They are not charged at phases 6, 7. Therefore, it is decided that a proper phase for electric charging is located at a phase 4 or 5. If an unrequired pulse signal is transmitted to a detection circuit, there is fear that for instance, even phase 0 might be proper for the electric charging. However, in such a case, an electric charge accumulated in the circuit is not easily discharged and the discharge occurs repeatedly. Hence it is decided that an output can be detected even at phases 1, 2......, if the retrieval is further continued. If such is the case, it is decided that a proper phase cannot be detected, and a correct decision will be made without deciding an improper phase as a proper phase. |
