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Ink-jet recording head

An inkjet recording and ink technology, which is applied in the field of inkjet recording heads, can solve the problems of increased loss, increased ink droplets, and reduced energy efficiency.

Inactive Publication Date: 2003-11-05
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the bubbling power of the electrothermal conversion element is directed not toward the ejection outlet side but toward the ink flow path side, increasing the portion that does not contribute to ink droplet ejection, resulting in increased loss and reduced energy efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0104]Figure 1A , 1B , 2A, and 2B represent the ink jet recording head of Reference Example 1. As shown in Figure 1, the basic structure of the inkjet recording head is: five ink supply ports 2 are provided on a single substrate 1, and cyan ink is supplied at the ink supply ports 2A and 2E, and cyan ink is supplied at the ink supply ports 2B and 2D. Magenta ink and yellow ink are supplied from the ink supply port 2C. On the discharge port plate 9 bonded to the substrate 1, for each ink supply port 2, a large droplet discharge port 3a for discharging a large droplet and a small droplet discharge port for discharging a small droplet are respectively provided. 3b. For ink supply ports 2A and 2B, the Figure 1A and 1B The left side is provided with a large droplet ejection port 3a, in Figure 1A and 1B The right side is provided with the small droplet discharge port 3b, and for the ink supply ports 2D and 2E, in Figure 1A and 1B The left side is provided with small droplet e...

reference example 2

[0137] Below, refer to Figure 3A and 3B The ink jet recording head of Reference Example 2 will be described. The description of the same parts as those in Reference Example 1 is omitted.

[0138] In this reference example, H L =H S And W L >W S . contains WS The dimensions of each part were obtained by the same calculation as in Reference Example 1.

[0139] In reference example 1, there is the problem that the ink flow channel 5b for small liquid droplets becomes long, and the whole inkjet recording head becomes larger. In this reference example, the ink for small liquid droplets can be increased without increasing the size of the inkjet recording head. Flow resistance S of channel 5b Sb .

Embodiment 1

[0141] Below, refer to Figure 4A and 4B Embodiment 1 of the ink jet recording head of the present invention will be described. Descriptions of the same parts as those in Reference Examples 1 and 2 are omitted.

[0142] In this example, H L =H S And W L >W S , the width of the small droplet ink channel 5b is narrower than the width of the small droplet pressure chamber 4b. That is, the large droplet ink flow channel 5a is directly connected to the large droplet pressure chamber 4b with the same width, and the small droplet ink flow channel 5b is narrower than the small droplet pressure chamber 4b, serving as a throttling portion for ink flow. In addition, the dimension of each part was determined by the calculation similar to reference example 1.

[0143] In the structure of Reference Example 2, the overall width of the ink flow channel 5b for small droplets is narrowed, and the shape of the heater 4b becomes slender, and there are constraints in the size design of the ...

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Abstract

The invention discloses an inkjet recording head, which can eject small droplets and large droplets. It passes from a common liquid chamber (6) through an ink flow channel (5a, 5b) and a pressure chamber (4a, 4b), and is connected to the inkjet recording head. The outlets (3a, 3b) use the thermal energy of the heaters (7a, 7b) to eject ink droplets from the ejection ports (3a, 3b). The width of the ink flow passage (5a, 5b) is narrower than the width of the pressure chamber (4a, 4b), and the ink flow passage (5a, 5b) serves as a throttling portion. If the cross-sectional area of ​​the ink flow path for small droplets is SS, the cross-sectional area of ​​the small droplet pressure chamber is SRS, the cross-sectional area of ​​the ink flow path for large droplets is SL, and the cross-sectional area of ​​the large droplet pressure chamber is SRL, then SS / SRS<SL / SRL. According to the structure of the present invention, losses can be reduced and energy efficiency can be improved even in nozzles that eject small ink droplets.

Description

technical field [0001] The present invention relates to an inkjet recording head for recording by ejecting ink droplets from ejection ports and adhering to a recording medium. Background technique [0002] Among ink ejection methods of inkjet recording apparatuses widely used today, there is a method using an electrothermal conversion element (heater). The principle is: to provide an electric signal to the electrothermal conversion element in the pressure chamber supplying ink to make it generate heat, and instantly heat the ink near the electrothermal conversion element to make it boil, and through the large bubble pressure suddenly generated by the phase change at this time, to eject ink from the ejection port to the outside. The inkjet recording head of this type has the advantages of simple structure and relatively easy integration of ink channels. [0003] In this inkjet recording head, in order to achieve high-precision recording, ink droplets finer than usual are so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/05B41J2/14B41J2/15B41J2/21
CPCB41J2/1404B41J2/15B41J2/2125B41J2002/14387B41J2002/14403B41J2002/14475B41J2/05
Inventor 土井健金子峰夫佃圭一郎及川真樹矢部賢治富澤惠二
Owner CANON KK
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