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Ink jet head

A jet head and ink technology, applied in printing and other directions, can solve the problems of vibration plate cracking, expansion, mechanical strength decline, etc.

Inactive Publication Date: 2004-10-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, thinning only the material, shape, and structure of conventional piezoelectric actuators will cause cracks (fractures) in the vibration plate, piezoelectric elements, upper electrodes, etc. during production, and film peeling, The membrane swells, and as a result, the productivity of the inkjet head decreases
[0011] In addition, light is thinned and each part is thick, so when using the inkjet head, the mechanical strength will decrease anyway, and as a result, cracks may occur on the vibrating plate, which is often deformed, and eventually the life of the inkjet head will be reduced. shorten

Method used

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Examples

Experimental program
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Effect test

no. 1 Embodiment

[0043] Figure 1 ~ Figure 3 An ink ejection head according to a first embodiment of the present invention is shown. The ink ejection head is provided with a head main body 1, and a plurality of pressure chambers having a supply port 2a for supplying ink and an ejection port 2b for ejecting ink are formed with recesses. Inside the print head body 1. The recesses 2 of the print head main body 1 open an approximately rectangular opening on an outer surface of the print head main body 1, and are arranged along the width direction of the opening and keep a certain distance from each other. Add, for simplicity, image 3 Although only three recesses 2 (nozzle hole 14 , piezoelectric element 23 , upper electrode 24 , etc. to be described later) are shown in the figure, there are actually many such recesses 2 .

[0044] The side walls of the recesses 2 of the print head main body 1 are made of pressure chamber constituents 5 made of stainless steel or photosensitive glass with a thic...

no. 2 Embodiment

[0068] Figure 8 shows the second embodiment of the present invention (and figure 1 the same part with and figure 1 The same reference numerals are used, and the detailed description thereof will be omitted.) The vibration plate 22 of the piezoelectric actuator 21 of the second embodiment is configured differently from that of the above-mentioned first embodiment.

[0069] In the second embodiment, the vibrating plate 22 is formed by laminating a compressive residual stress layer 29 having a compressive residual stress and a tensile residual stress layer 30 having a tensile residual stress in the thickness direction of the vibrating plate 22, The above-mentioned tensile residual stress layer 30 is arranged on the side closer to the head main body 1 than the compressive residual stress 29 . Preferably, the residual stress of the compressive residual stress layer 29 is set at below 300GPa (assuming that the compression side of the stress is negative and the tension side is p...

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Abstract

A small-sized ink jet head and a fabricating method of the same is provided, miniaturized a spray head of a piezoelectric actuator (21) which is used to spray ink from a pressure compartment (3). A vibrator (22) is composed of two layers including a layer (27) of smaller Young's modulus and a layer (28) of larger Young's modulus to increase productivity and reliability. The layers (27, 28) have Young's moduli from 50 to 350 GPa, and the vibrator (22) has a total thickness of 1 to 7 mu m.

Description

field of invention [0001] The present invention relates to an ink ejection head used in an inkjet printer and its manufacturing method, in particular to the technique of improving the vibrating plate in the piezoelectric actuator when the piezoelectric actuator is used to eject ink. Background technique [0002] In recent years, inkjet printers have been widely used in offices and homes. The inkjet heads used in the inkjet printers are continuously required to have lower noise and higher printing quality, and various types of inkjet heads have been designed. Generally speaking, they are roughly classified into the following two types. [0003] The first method is: part of the flow path and the ink chamber form a pressure chamber together with a piezoelectric actuator with a piezoelectric element, and apply a pulse-state voltage to the piezoelectric element to deform the piezoelectric actuator, and let the above The volume of the pressure chamber is deformed so that a pressu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/14B41J2/16
CPCB41J2/161B41J2002/1425B41J2/1623B41J2/1628B41J2/1646B41J2002/14387B41J2/1631B41J2/14233B41J2/1645Y10T29/42Y10T29/49346
Inventor 渡边修松尾幸治富田健二神野伊策
Owner PANASONIC CORP