Ink-jet recording device, and ink-jet recording head and ink-jet recording method

Abstract

Thei nvention provides an ink-jet recording device, and ink-jet recording head and ink-jet recording method. At least two individually drivable electrothermal converters having a different heating value are arranged in an ink channel while differentiating the distances to the ejection opening. At the time of preliminary ejection, an ink ejection drive signal is fed to the electrothermal converter on the side farther from the ejection opening and then it is fed to the electrothermal converter on the side closer to the ejection opening. Preliminary ejection is performed immediately before recording every line and the number of ejection times is set higher for the electrothermal converter on the side farther from the ejection opening than for the electrothermal converter on the side closer to the ejection opening.

Description

technical field [0001] The present invention relates to an inkjet recording device, an inkjet recording head, and an inkjet recording method for recording on a recording medium after ejecting ink. Background technique [0002] A recording device with the functions of a printer, copier, facsimile, etc., or a recording device used as an output device such as a composite electronic device such as a computer and a word processor, or a workstation, etc. Images (including characters and symbols, etc.) are recorded on a recording medium (recorded material) such as a thin plate used. According to the recording method, the recording device can be classified into inkjet type, dot matrix type, thermal type, laser beam type and the like. [0003] In a serial type recording device that performs recording while performing main scanning in a direction intersecting with the conveying direction of the recording medium (paper feeding direction, sub-scanning direction), the The recording hea...

AI Technical Summary

Problems solved by technology

[0009] However, as mentioned above, in order to prevent ink mist at the black ejection port, large liquid droplets are ejected after ensuring the ejection cross-sectional area, and in order not to generate thickened ink and air bubbles at the color ejection port. Due to the disadvantages, large droplets (medium droplets, large droplets) are used for preliminary ejection, and the cross-sectional shape of the ejection port must be made into a shape with a small cross-sectional area and a relatively high height. Therefore, such technical problems have arisen. That is, an extra space is formed between the ejection port portion on the incident side and the highest part of the top end of the liquid path. Even if a medium droplet or a large droplet is used for preliminary ejection, due to the extra space, it cannot be completely discharged. Air bubbles are discharged, and air bubbles remain in the extra space, and poor recording often occurs even though preliminary ejection is performed.

In addition, even if the number of preliminary ejections (the number of times of ejection) is increased with medium droplets or large droplets, it is difficult to completely discharge the residual air bubbles, and as a result, only a large amount of ink will be consumed.

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