Hitachi, Ltd.

Tetsuo Doi

Takahiro Yamada

Satoshi Shimada

Yasumasa Matsuda

Yasuyuki Kojima

Kanji Kawakami

Motohisa Nishihara

Kiyohiko Tanno

Syoji Sagae

Kunio Ono

Taisaku Kohzuma

A nozzle head of an ink-jet printing apparatus according to the present invention comprises an ink reservoir for storing the ink supplied from an ink tank, a pump chamber provided between said ink reservoir and a nozzle for injecting ink particles, and a fluid diode provided between said ink reservoir and said pump chamber, which are all formed in a same substrate, wherein said pump chamber is caused to change its volume responsive to electric signals so that the ink stored therein is injected from said nozzle, and the ink is prevented from reversely flowing from said pump chamber to said ink reservoir when the volume of the pump chamber is changed, thereby to improve the frequency response of ink particles injected from the nozzle.

Nozzle head of an ink-jet printing apparatus with built-in fluid diodes

A thermal recording apparatus for recording an information signal on the heat-sensitive recording medium in a form of visible information comprises a plurality of heat-generating resistance elements, a drive circuit for supplying selectively drive current to said heat-generating resistance elements in response to the information signal, a recording medium disposed in contact with the plurality of heat-generating resistance elements and adapted to change color upon sensing heat, means for driving the plurality of heat-generating resistance elements and the recording medium relative to each other, and a switching circuit means for inverting the direction of the drive current applied to the heat-generating resistance elements in a predetermined manner.

Thermal recording apparatus

In an apparatus of the type wherein ink under pressure is applied to a nozzle which is vibrated so that the ink emitted from the nozzle thereafter breaks up into ink drops which are charged in a charging tunnel in response to a video signal, means are provided, in accordance with this invention, for compensating the amount of charge on each ink drop or the strength of the deflecting field action on the ink drop, on the basis of information from a detecting means which detects the amount of deflection of one or more calibrating drops periodically so that the amount of deflection of the drop of writing fluid for a given charge may be held to a predetermined value.

Ink drop writing apparatus

Liquid droplets of large diameter and small diameter are alternately emitted from a jet nozzle and are deflected in accordance with control information so that the liquid droplets of large diameter and/or the liquid droplets of small diameter can be directed toward a recording sheet as desired. This system is especially effective in controlling ink droplets in an ink jet recorder using ink.

Liquid droplet supplying system

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Hitachi, Japan

Tetsuo Doi