| http://www.w3.org/ns/prov#value | - ad drive period into n segments (where n is an integer that is 2 or greater) and for outputting a pulse signal whose cycle Tp is larger than the Helmholtz cycle Tc in synchronism with a dot forming signal from outside; and a circuit constant adjusting means for adjusting a time constant of the first signal in such a manner that an ink droplet jet out last has a velocity which allows the ink dr
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