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Ink jet print head

An inkjet printing head and nozzle technology, applied in printing and other directions, can solve the problems of image quality reduction and unbalanced ejection performance, etc., and achieve the effect of improving balance

Inactive Publication Date: 2009-03-04
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can also cause unbalanced jetting performance between different nozzles, reducing image quality

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0045] First, a first embodiment of the present invention will be described with reference to FIGS. 1 , 2 , 3A, 3B and 3C.

[0046] FIG. 1A is a partially cutaway perspective view schematically showing an inkjet printhead 1 according to a first embodiment. This inkjet printhead 1 includes an element substrate 2 having an electrothermal conversion element 4 as an ejection energy generating element, and a channel constituting substrate (orifice plate) 3 stacked on a main surface 2 a of the element substrate 2 .

[0047] As shown in FIG. 1B , three printing element columns H1 , H2 , and H3 each composed of a plurality of electrothermal conversion elements 4 are arranged in parallel to each other on the element substrate 2 . The ink supply port 5 is formed between the first printing element column H1 and the second and third printing element columns H2 and H3.

[0048] A plurality of ejection port portions 6, a plurality of bubbling chambers 9, and a plurality of ink supply chann...

no. 2 approach

[0062] A second embodiment of the present invention will now be described.

[0063] Figure 4 is a bottom view of a part of the ejection port array in the inkjet printhead according to the second embodiment. Figure 4 The positional relationship between the foaming chamber 9 , the ink supply channel 10 , the electrothermal conversion element 4 , and the ejection ports 71 , 72 , and 73 is shown. In the second embodiment, the four ejection port columns E1 , E2 , E3 and E4 are arranged in parallel to each other. The first and second ejection port columns E1 and E2 are arranged on one side of the ink supply port 5 (on the left side in the drawing). The third and fourth ejection port columns E3 and E4 are arranged on the other side of the ink supply port 5 (in the figure, on the right side). As shown in FIG. 3A , each of the first and third ejection port rows E1 and E3 is constituted by a large ejection port 71 . As shown in FIG. 3B , the second ejection port row E2 is composed...

no. 3 approach

[0069] A third embodiment of the present invention will now be described.

[0070] In the second embodiment, all the injection openings are cylindrical. However, the injection port does not have to be cylindrical but may have other shapes. In the third embodiment, each injection port portion is formed to have an elliptical cross section.

[0071] Also in the third embodiment, the liquid amounts Va, Vb, and Vc of the large, medium, and small ink droplets are 2.8 ng, 1.4 ng, and 0.7 ng, respectively. The cross-sectional areas S1a, S2a and S3a of the injection ports are about 120um 2 、60um 2 and 30um 2 . The ratios of the opening area of ​​the second injection port portion to the opening area of ​​the injection port, ie, S1b / S1a, S2b / S2a, and S3b / S3a, were 3.1, 3.6, and 6.3, respectively.

[0072] Therefore, the magnitude relationship between the ratio of the opening area of ​​the second injection port portion to the opening area of ​​the first injection port portion is as ...

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Abstract

An object of the present invention is to provide an ink jet print head having plural types of nozzles arranged on the same substrate and through which ink droplets of different sizes are ejected, the ink jet print head exhibiting acceptable ejection performance regardless of the type of the nozzle. Thus, according to the present invention, each of the plural types of nozzles includes a bubbling chamber having an ejection energy generating element allowing an ink droplet to be ejected to a position located opposite an ejection port and an ejection port portion allowing the ejection port and the bubbling chamber to communicate with each other. Ratio of opening area of the ejection port portion at a position where the ejection port portion and the bubbling chamber communicate with each other, to the opening area of the ejection port is higher for the nozzle with a smaller ejection amount.

Description

technical field [0001] The present invention relates to an inkjet printing head for ejecting ink droplets to print on a printing medium, and more particularly to an inkjet printing head having a plurality of types of nozzles arranged on the same substrate through which ink droplets of different sizes are ejected Inkjet print head. Background technique [0002] As the operating speed of inkjet printing devices has increased and the quality of images provided by inkjet printing devices has improved, attempts have been made to reduce the size of the drops ejected by the printhead while increasing the ejection frequency. [0003] Reduction in the size of ejected droplets requires a reduction in the opening area of ​​each ejection port in the printhead. However, the reduction in the opening area of ​​the ejection port increases the flow resistance to the liquid in the portion communicating with the ejection port (the ejection port portion), which prevents desired ejection perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/145B41J2/14
CPCB41J2002/14475
Inventor 松本光弘金子峰夫土井健山根彻及川真树富泽惠二井手秀一泷野寒水锅岛直纯
Owner CANON KK
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