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Liquid discharge apparatus and liquid discharge head

A liquid discharge head and liquid discharge technology, which is applied in printing and other directions, can solve the problems of increasing fluid impedance, image quality deterioration, and bad discharge, and achieve the effects of suppressing image quality deterioration, reducing relative permittivity, and suppressing bad discharge

Active Publication Date: 2017-08-08
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A liquid discharge head that discharges a liquid such as ink from a discharge port has a problem that volatile components in the liquid discharged from the discharge port volatilize and the liquid thickens near the discharge port, resulting in a change in the discharge speed of the discharged liquid droplets, And the droplet landing accuracy is affected
Therefore, when the liquid is discharged for the first time after an interruption, the solid content may increase the fluid resistance of the liquid through the discharge port, which may lead to poor discharge
However, the liquid discharge head described in Japanese Patent Laid-Open No. 2002-355973 does not take into consideration related to such poor discharge.
Therefore, poor discharge that occurs when the liquid is discharged for the first time after interruption may cause deterioration of image quality

Method used

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  • Liquid discharge apparatus and liquid discharge head
  • Liquid discharge apparatus and liquid discharge head
  • Liquid discharge apparatus and liquid discharge head

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0135] Specific examples will be described below. Although will be carried out and used according to Figure 1-12 The description is made in relation to the case of the liquid discharge head of the first application example shown, but liquid discharge heads according to other application examples can be used in the same manner.

[0136] Explanation of the flow of liquid in the discharge port

[0137] Figures 21A-21C It is a schematic diagram illustrating the vicinity of the discharge port of the recording element substrate in detail. Figure 21A is a plan view from the discharge direction of the discharge liquid, Figure 21B is along Figure 21A A sectional view taken on line XXIB-XXIB, and Figure 21C is shown along Figure 21A The oblique view taken along the line XXIC-XXIC.

[0138] In the recording element substrate 10, for the discharge port 13 that is not performing the discharge operation as described above, a circulation flow C is formed in which the liquid i...

no. 2 example

[0157] Figure 30 is a diagram showing the flow of ink flowing through the liquid discharge head according to the second embodiment. Such as Figure 30 As shown, the liquid discharge head according to the present embodiment has a stepped portion at the communication portion between the passage 26 and the discharge port portion 13b. In the present embodiment, the portion from the discharge port 13 to the portion forming the stepped portion is the discharge port portion 13b connected to the passage 26 via a portion (part of the passage) having a larger diameter than itself. Therefore, if Figure 30 Shown specifies P, W and H in this example. Flow pattern A can also be realized in the liquid discharge head having this shape by setting P, W, and H to satisfy Expression (3). Therefore, the multi-step structure from the channel to the discharge port allows the flow resistance in the direction from the recording element 15 to the discharge port 13 to be relatively small.

no. 3 example

[0159] Figure 31A and 31B are diagrams showing two examples of the shape of, in particular, the discharge port of the liquid discharge head according to the third embodiment. Figure 31A and 31B It is a plan view (schematic diagram) of the discharge port 13 viewed from the discharge direction of the liquid. The discharge port 13 according to the present embodiment is shaped such that a protrusion 13d extending from the facing position toward the center of the discharge port is formed. The protrusion portion 13d extends continuously from the outer surface of the discharge port 13 to the inside of the discharge port portion 13b. Flow pattern A can also be realized in the configuration with these protrusions by setting H, P, and W to satisfy the above-mentioned expression (2).

[0160] Figure 31A The discharge port in the illustrated example has a protrusion 13 d protruding in a direction crossing the flow of the liquid in the channel 26 . Figure 31B The discharge port i...

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Abstract

The invention provides a liquid discharge apparatus and a liquid discharge head. The liquid ejection apparatus includes liquid discharge heads including a recording element substrate and a reservoir used for storing liquid supplied to the liquid discharge heads. The recording element substrate includes a plurality of discharge ports for discharging the liquid; a plurality of pressure chambers whose internal parts are provided with recording elements for generating energy required by discharging of the liquid, wherein the plurality of pressure chambers communicate with the plurality of discharge ports through discharge channels; a liquid supply channel configured to supply the liquid to the plurality of pressure chambers; and a liquid recovery channel configured to recover liquid from the plurality of pressure chambers. The plurality of pressure chambers communicate with the liquid supply channel and the liquid recovery channel so that the liquid flows through the plurality of pressure chambers and the relative dielectric constant [epsilon]r of the liquid stored in the reservoir satisfies the relationship of [epsilon]r<=65.

Description

technical field [0001] The present invention relates to a liquid discharge device and a liquid discharge head. Background technique [0002] A liquid discharge head that discharges a liquid such as ink from a discharge port has a problem that volatile components in the liquid discharged from the discharge port volatilize and the liquid thickens near the discharge port, resulting in a change in the discharge speed of the discharged liquid droplets, And the droplet landing accuracy is affected. [0003] It is known that as a measure against this liquid thickening phenomenon, there is a method of circulating the ink supplied to the liquid discharge head along the circulation path. Japanese Patent Application Laid-Open No. 2002-355973 describes that the clogging of the discharge port due to volatilization of the liquid from the discharge port is suppressed by circulating the liquid in the passage formed between the member forming the discharge port and the substrate forming the...

Claims

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Application Information

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IPC IPC(8): B41J2/14B41J2/185B41J2/175
CPCB41J2/14B41J2/175B41J2/185B41J2002/1853B41J2/045B41J2/14032
Inventor 中川喜幸岩永周三奥岛真吾真田干雄袴田慎一
Owner CANON KK