Ink jet head with nozzle arrangement to reduce viscous drag
First Claim
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1. A head for ink jet printing comprising:
- a substrate;
a plurality of nozzles arranged on a flat surface of the substrate for discharging ink, the nozzles being arranged in a zig zag arrangement wherein the nozzles are arranged in only first and second straight lines on the flat surface, and wherein the nozzles arranged in the first straight line are offset with respect to the nozzles arranged in the second straight line along a direction perpendicular to a printing direction; and
path means formed in the substrate for supplying the ink to the nozzles, the path means including;
a plurality of pressure chambers formed in the substrate, anda plurality of ink slits, having a substantially narrower width than the pressure chambers, formed in the substrate and arranged radially, each ink slit fluidly coupling one of the pressure chambers to one of the nozzles, wherein the ink slits have lengths that are similar so that a viscous drag for ink passing through the ink slits is equalized among the ink slits;
wherein a depth of each ink slit is larger than a width of each ink slit at a location near the nozzles.
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Abstract
A nozzle arrangement structure in an ink jet print head. A plurality of pressure chambers are arranged in circular form, and a plurality of nozzles receive an ink supply from the corresponding pressure chambers and are arranged in an zig zag arrangement to obtain a small interval between the dots. Two straight lines concerning the zig zag arrangement are inclined against a printing direction and a direction perpendicular to the printing direction. When an ink discharge from the nozzles is controlled, preprocessing of serial data is carried out by hardware.
39 Citations
16 Claims
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1. A head for ink jet printing comprising:
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a substrate; a plurality of nozzles arranged on a flat surface of the substrate for discharging ink, the nozzles being arranged in a zig zag arrangement wherein the nozzles are arranged in only first and second straight lines on the flat surface, and wherein the nozzles arranged in the first straight line are offset with respect to the nozzles arranged in the second straight line along a direction perpendicular to a printing direction; and path means formed in the substrate for supplying the ink to the nozzles, the path means including; a plurality of pressure chambers formed in the substrate, and a plurality of ink slits, having a substantially narrower width than the pressure chambers, formed in the substrate and arranged radially, each ink slit fluidly coupling one of the pressure chambers to one of the nozzles, wherein the ink slits have lengths that are similar so that a viscous drag for ink passing through the ink slits is equalized among the ink slits; wherein a depth of each ink slit is larger than a width of each ink slit at a location near the nozzles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification