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Liquid-droplet jetting apparatus and liquid-droplet jetting head

A technology of droplet spraying and spraying liquid, applied in printing, piezoelectric devices/electrostrictive devices, etc., can solve problems such as no longer ideal

Active Publication Date: 2009-04-01
BROTHER KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, these measures are no longer ideal due to the increasing density of pressure chambers (ink ejection chambers)

Method used

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  • Liquid-droplet jetting apparatus and liquid-droplet jetting head
  • Liquid-droplet jetting apparatus and liquid-droplet jetting head
  • Liquid-droplet jetting apparatus and liquid-droplet jetting head

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0126] Figure 1A is a schematic configuration diagram showing a schematic configuration of an inkjet printer (droplet ejection device) according to the present invention, and Figure 1B For explanatory drawing, the relationship between the cavity unit, the piezoelectric actuator and the flexible wiring board (COP) according to the present invention is shown.

[0127] In the inkjet printer 1 according to the present invention, as Figure 1A As shown, an inkjet head 3 for recording on recording paper P (recording medium) is provided on the lower surface of a carriage 2 on which an ink cartridge (not shown) is mounted. The carriage 2 is supported by a carriage shaft 5 and a guide plate (not shown) provided in the printer frame 4 , and reciprocates in a direction B perpendicular to a feeding direction A of the recording paper P. As shown in FIG. The recording paper P conveyed in the direction A from a paper feeding unit not shown is introduced into a space between a pressure ro...

no. 2 approach

[0166] In this embodiment, as shown in FIG. 14, the piezoelectric actuator has a laminated structure in which an insulating layer 12f having a layer thickness smaller than that of the piezoelectric material layers 12a, 12b is sandwiched between the piezoelectric material layer 12a and the piezoelectric material layer 12a. between the electrical material layers 12b. It is to be noted that such an insulating layer 12f may be formed of the same material as the piezoelectric material layers 12a to 12d.

[0167] Only the first constant potential electrodes 22B are formed at a constant pitch on one surface (upper surface) side of this insulating layer 12f, and only the second constant potential electrodes 23 are formed at a constant pitch on the other surface (lower surface) side thereof. superior. Therefore, the first constant potential electrode 22B and the second constant potential electrode 23 are electrically insulated from the insulating layer 12f, but they are formed between...

no. 3 approach

[0171] In this embodiment, as shown in FIG. 15, the uppermost piezoelectric material layer 12a in the second embodiment is deleted, and instead another insulating layer 12g having a smaller layer thickness similar to the insulating layer 12f is disposed on the piezoelectric material layer 12a. Between the electrical material layer 12c and the top plate 15. The second constant potential electrode 23 is formed on the upper surface side of this insulating layer 12g, and the first constant potential electrode 22B is formed on the lower surface side thereof. In this case, the first and second constant potential electrodes 22B, 23 are symmetrically formed so as to sandwich the individual electrode 21 arranged on the lower surface side of the piezoelectric material layer 12b. Accordingly, first active portions 72 a , 73 a respectively corresponding to central portions of the pressure chamber 40 and second active portions 82 , 83 respectively corresponding to portions on the outer per...

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PUM

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Abstract

A droplet jetting device and a droplet jetting head are provided. The droplet jetting device includes: the droplet jetting head, a piezoelectric actuator of which is jointed to a hollow cavity unit to cover a plurality of pressure chambers therein, a first active portion of the actuator is corresponding to a central portion of the pressure chambers, a second active portion thereof is corresponding to periphery portion of the pressure chambers; a voltage applying mechanism, when the first and the second active portions are applied with the voltage, the active portions expand in a first direction towards the pressure chambers and retracts in a section direction that is vertical to the first direction; when the first active portion is applied with a first voltage, the voltage applying mechanism does not apply a second voltage on the second active portion, when the first active portion is not applied with the first voltage, the voltage applying mechanism applies the second voltage on the second active portion. When applying voltage to the first active portion the first active portions deform to project toward the pressure chambers. The second active portion does not deform and the influence of deformation of the first active portion does not reach the adjacent pressure chambers. Accordingly, effect of suppressing crosstalk is exhibited.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Japanese Patent Application No. 2007-256922, filed September 29, 2007, and Japanese Patent Application No. 2008-094150, filed March 31, 2008, the contents of which are hereby incorporated in their entirety by Cited as reference. technical field [0003] The present invention relates to a droplet ejection device such as an inkjet printer and a droplet ejection head such as an inkjet head. Background technique [0004] Conventionally, as one of the droplet ejection devices, there is known an inkjet printer provided with an inkjet head having a cavity unit in which a plurality of pressure chambers are regularly formed and connected to the cavity unit so as to a piezoelectric actuator selectively ejecting ink in the pressure chamber; and a voltage applying mechanism for applying a voltage to the piezoelectric actuator. Then, as the above-mentioned piezoelectric actuator, there are k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/14B41J2/045H01L41/08H10N30/00
CPCB41J2/14209B41J2002/14266B41J2002/14225B41J2/04581B41J2002/14217B41J2/14233B41J2002/14491B41J2002/14258B41J2/04588
Inventor 小岛正友关口恭裕小野胜司
Owner BROTHER KOGYO KK
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