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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKiyoshi Yamamori, Masayoshi Miura, Akira Mizoguchi
Estimating the term…
An ink jet writing head includes a housing shaped to provide an inner liquid chamber for containing ink therein, a piezoelectric transducer for generating short-duration pressure rises in the liquid in the inner chamber, and an outer liquid chamber which is separated by a dividing plate from the inner liquid chamber and connected thereto by a connecting channel formed in the dividing plate. The outer liquid chamber is of such an axial dimension that it may provide capillary action on the ink supplied from an ink supply source. The outer chamber is formed by an ink nozzle plate secured to a surface of the housing spaced from the dividing plate. The ink nozzle is axially aligned with the connecting channel to cause the ink in the outer chamber to leave the writing head in response to the pressure rise in the inner chamber. A spacer is provided in the other liquid chamber to maintain the axial dimension thereof at a predetermined value regardless of errors which might be produced during manufacture of the housing and assemblage of the writing head.
An ink jet writing head for applying ink droplets to a surface, comprising a housing shaped to form an inner liquid chamber for containing ink to be applied to the surface, said housing having an electromechanical transducer for generating short-duration increases of ink pressure in said inner liquid chamber, a dividing plate having therein a connecting channel and secured to the housing opposite to said transducer, a nozzle plate having therein an ink discharge nozzle axially aligned with said connecting channel and secured to the housing at a predetermined distance from said dividing plate to define an outer liquid chamber with said dividing plate, said predetermined distance being sufficient to provide capillary action in said outer liquid chamber, said outer chamber being in communication with an ink supply source, and spacer means provided in said outer liquid chamber for maintaining the axial dimension of said outer liquid chamber substantially equal to said predetermined distance, said spacer means extending radially within the outer chamber.
An ink jet writing head as claimed in any one of the preceding claims, further comprising a second nozzle plate having therein an air discharge nozzle and secured to said housing to define with the ink discharge nozzle plate an air chamber in communication with a source of pressurized air, said air discharge nozzle being in alignment with said ink discharge nozzle to enable air and ink to eject from the writing head, said air chamber being axially dimensioned to produce a laminar air flow in the air chamber, and second spacer means provided in said air chamber to maintain the axial dimension at a predetermined size.
An ink jet writing head for applying ink droplets to a surface, comprising a housing shaped to form an inner liquid chamber for containing ink to be applied to the surface, said housing having means for generating short-duration increases of ink pressure in said inner liquid chamber, a dividing plate having therein a connecting channel secured to the housing opposite to said pressure means, a first nozzle plate having therein an ink discharge nozzle axially aligned with said connecting channel and secured to the housing at a predetermined distance from said dividing plate to define an outer liquid chamber with said dividing plate, said outer chamber being in communication with an ink supply source, a second nozzle plate having therein an air discharge nozzle and secured to said housing to define with the first nozzle plate an air chamber in communication with a source of pressurized air, said air discharge nozzle being in alignment with said ink discharge nozzle to eject air and ink from the writing head, the axial dimension of said air chamber being sufficient to provide a laminar air flow therein, and spacer means provided in said air chamber and extending radially therein to maintain said axial dimension of said air chamber.
Dependencies are inferred from the claim text.