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Inkjet head unit

A technology of inkjet head and actuator unit, applied in the direction of inking device, printing, etc.

Active Publication Date: 2007-12-05
BROTHER KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, at the other pressure chamber, the detrimental effect of crosstalk becomes severe

Method used

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Embodiment Construction

[0042] Hereinafter, presently preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0043] 1 to 8, an ink jet head unit according to a first embodiment of the present invention will be described. In FIGS. 1 and 2, reference numeral 1 generally denotes an inkjet head unit provided in an inkjet printer (not shown) for ejecting ink droplets onto a recording medium in the form of paper so that Information or images are recorded on the recording medium. The inkjet head unit 1 includes: an inkjet printhead 70 having a rectangular shape in plan view extending in the main scanning direction and a plurality of nozzles 8 through which ink is ejected to paper ( FIGS. 4 and 5 ); A base block 71, which is provided above the print head 70, and two ink tanks 3, 3 are formed in the base block 71, each ink tank 3 serving as a flow of ink to be supplied to the print head 70 aisle.

[0044] The print head 70 includes: a flow channel un...

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PUM

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Abstract

An inkjet head unit includes a printhead comprising: a flow-path unit having nozzles and pressure chambers communicated therewith; an actuator unit having a piezoelectric sheet extending across the chambers and having thereon individual electrodes positioned correspondingly to the chambers and a common electrode on the side opposite to the individual electrodes, the actuator unit being fixed to the flow-path unit to vary the volume of each chamber; a dielectric film formed on a surface of the actuator unit opposite to the flow-path unit to extend over regions corresponding and not corresponding to the chambers, the film having through-holes and a dielectric constant lower than that of the sheet; first wires formed on a surface of the film opposite to the actuator unit to extend in a substantially same direction; and second wires extending through the through-holes and connecting the respective individual electrodes to the first wires.

Description

[0001] References [0002] This application is based on Japanese Patent Application No. 2004-209848 filed on July 16, 2004, the contents of which are incorporated herein by reference. technical field [0003] The present invention relates to an ink jet head unit including a print head for ejecting ink droplets onto a recording medium. Background technique [0004] As an inkjet head unit including a printing head that ejects ink droplets onto paper or other recording media, there is known an inkjet head unit that includes a flow channel unit and a piezoelectric actuator device unit. The flow channel unit has a plurality of pressure chambers and a plurality of nozzles respectively communicating with the pressure chambers so as to eject ink droplets through the nozzles. The function of the piezoelectric actuator unit is to pressurize the ink in the pressure chambers by changing the internal volume of the pressure chambers. Such an inkjet head unit is disclosed in, for exampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/045B41J2/055B41J2/175
CPCB41J2002/14306B41J2002/14225B41J2002/14217B41J2202/20B41J2002/14491B41J2/14209
Inventor 坂井田惇夫
Owner BROTHER KOGYO KK
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