Hitachi, Ltd.

Mitsuhiro Nakagaki

Shinji Matsuoka

Takahiro Yamada

Osamu Isoo

Hideyuki Oomori

An ink-jet recording head apparatus of charge modulation and continuous jet type comprising an annular ink pump chamber defined by the inner peripheral face of a cylindrical electrostrictive element, the annular side faces of a pair of elastic sealing members and the outer peripheral face of a fluid passage-providing insert, a tortuous inlet path connecting the ink pump chamber to a supply source of ink under pressure, and a tortuous outlet path connecting the ink pump chamber to an ink ejection orifice.

Ink-jet recording head apparatus

An ink jet recording apparatus of a dot matrix type in which the amounts of charges given to ink droplets are controlled depending upon recording conditions. The apparatus comprises, in one embodiment, a central processing unit (CPU) capable of generating unit video data and dot data concerning an image to be recorded, a random access memory (RAM) for storing the unit video data, a selector for reading out predetermined number of unit video data among those stored in the RAM, an AND gate receiving the dot data and the selected unit video data and a digital/analog converter for generating from the output of the AND gate an image signal for giving charges to the ink droplets for controlled deflection of them.

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Hitachi, Japan

Mitsuhiro Nakagaki