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Ink jet recording head

a recording head and jet technology, applied in printing and other directions, can solve the problems of affecting the quality of ink, and difficult to effectively suppress the development of bubbles to the supply path side, so as to enhance the filtering performance, enhance the discharge efficiency, and effectively suppress the bubble development

Inactive Publication Date: 2009-11-24
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]Under the circumstances, therefore, the present invention is designed to aim at the provision of an ink jet recording head having the flow path structure capable of enhancing the discharge power, filtering performance, and discharge frequency characteristics even with a liquid droplet being made smaller.

Problems solved by technology

However, the following problem is encountered particularly when the liquid droplet is made small.
Here, for example, the viscosity resistance becomes extremely high in the discharge direction if the diameter of discharge port is made smaller than Φ10 μm, and the problem of the kind is particularly encountered conspicuously.
Also, with the increased flow resistance in the discharge direction, it becomes more difficult for ink to flow toward the discharge port side when bubbling occurs by use of the electrothermal converting element that serves as an energy generating element.
However, with the simple arrangement of making the width of flow path narrower, it takes more time inevitably to refill ink in the discharge port portion after the execution of discharge.
Then, a problem of slower speed recording is encountered.
Also, it is known that defective discharges of the ink jet recording apparatus may take place if dust particles are allowed to enter the discharge port portion and mixture thereof occurs therein.
However, since the thickness (diameter) of each filter provided for the supply path is fixed eventually in the height direction of the supply path, there is no alternative but to simply make the gap between the columns constituting filters smaller.
As a result, it becomes inevitable to take more time to refill ink in the discharge port after discharge.

Method used

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Examples

Experimental program
Comparison scheme
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first embodiment

(First Embodiment)

[0036]FIG. 1 is a perspective view that shows an ink jet recording head in accordance with a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line 2—2 in FIG. 1. Here, in these figures and others, electrical wiring and others (not shown) needed for driving the electrothermal converting element are not shown. The base plate 34, which is formed by glass, ceramics, plastic, metal, or the like, for example, is used. The material of the base plate 34 is not the essence of the present invention. The material is not necessarily limited if only it can function as a part of the flow path formation member, being functional as a supplying member for the material layer that forms the ink discharge port. Now, for the present embodiment, the description will be made of the case where Si base plate (wafer) is used. As shown in FIG. 2, on one face of the base plate 34, there are formed the electrothermal converting element 1 serving as discha...

second embodiment

(Second Embodiment)

[0046]FIG. 4A is a vertically sectional view that shows one of plural nozzles of an ink jet recording head of a second embodiment, taken in the direction perpendicular to the base plate. FIG. 4B is a plan perspective view that shows the nozzle observed in the direction perpendicular to the base plate. FIG. 4C is a cross-sectional view taken along line 4C—4C in FIG. 4A. Hereunder, the description will be made mainly of the aspects that differ from those of the first embodiment.

[0047]In accordance with the present embodiment, the electrothermal converting element is square of 18 μm. The height of the ink supply path 5 is 10 μm. The thickness of the discharge port plate 8, which dually serves as the flow path formation member, is 10 μm. The diameter of the discharge port is 9 μm.

[0048]Then, as shown in FIGS. 4A, 4B, and 4C, the flow path structure 3 is provided in the supply path 5 in order to make the flow path section right angled to the liquid flow direction small...

third embodiment

(Third Embodiment)

[0053]FIG. 5A is a vertically sectional view that shows one of plural nozzles of an ink jet recording head of a third embodiment, taken in the direction perpendicular to the base plate. FIG. 5B is a plan perspective view that shows the nozzle observed in the direction perpendicular to the base plate. FIG. 5C is a cross-sectional view taken along line 5C—5C in FIG. 5A. Also, FIGS. 6A, 6B and 6C are views that illustrate the variational example of the nozzle. Hereunder, the description will be made mainly of the aspects that differ from those of the first embodiment. The present embodiment is characterized particularly in that the flow path structure 3 is provided between the supply path 5 and the opening of the supply chamber 4, not in the supply path 5.

[0054]In accordance with the present embodiment, the electrothermal converting element 1 is square of 18 μm. The height of the ink supply path 5 is 10 μm. The thickness of the discharge port plate 8, which dually ser...

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PUM

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Abstract

An ink jet recording head is provided with a flow path structure capable of enhancing the discharge power, filtering performance, and discharge frequency characteristics even with liquid droplets being made small. The flow path structure thus provided in a supply path makes the flow path sectional area right angled to the liquid flow direction small, and changes the area (shape) thereof at the same time. The flow path structure is formed by a flat square column serving as a first structure for closing a part of the supply path, and plural columns serving as a second structure for closing a part of the supply path. The square column is formed on the base plate in the entire width thereof to close the supply path on the base plate side. The plural columns are arranged on the square column symmetrically with respect to the center of the supply path, and extended from the square column to the discharge port plate in the height direction of the supply path.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an ink jet recording head used for an ink jet recording apparatus that performs recording by forming ink liquid droplets with ink to be discharged.[0003]2. Related Background Art[0004]A printer, a copying machine, a printing device for facsimile equipment, and the like, are structured to print images, which are formed by dot-patterns, on a printing medium (also called a recording sheet or a recording medium), such as paper, thin plastic plate, or cloth, in accordance with image information.[0005]Printing apparatuses of the kind are divided into those of ink jet type, wire-dot type, thermal type, laser beam type, and others by the printing method adopted by each of them, respectively.[0006]Of those apparatuses, the one that adopts ink jet method is such that it executes printing (recording) by discharging ink from the printing head to a printing medium. It can print highly precise images ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B41J2/15B41J2/145B41J2/05B41J2/04B41J2/14
CPCB41J2/14145B41J2002/14387B41J2002/14403B41J2/04
Inventor MURAKAMI, SHUICHITOMIZAWA, KEIJI
Owner CANON KK