Liquid discharge head, recording device, and method for evaluating liquid discharge head

The liquid ejection head addresses the issue of split droplets by establishing specific conditions for the one-drop formation upper limit speed, ensuring efficient and high-quality droplet ejection for improved image formation.

WO2025115884A1PCT designated stage expired Publication Date: 2025-06-05KYOCERA CORP
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Patent Information

Application Number
PCT/JP2024/041912
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-11-28
Filing Date
2024-11-27
Publication Date
2025-06-05

AI Technical Summary

Technical Problem

Existing liquid ejection heads, such as inkjet heads, face challenges in preventing split droplets during the ejection process, which affects the quality of images formed on recording media.

Method used

The liquid ejection head incorporates a first flow path with an ejection hole, a pressure chamber, and a supply path, along with an actuator that applies pressure. The head defines the one-drop formation upper limit speed and utilizes specific conditions, such as a minimum speed of 4.0 m/s or more, to minimize split droplets.

Benefits of technology

This configuration ensures that the liquid is ejected as a single droplet without splitting, improving the image quality by maintaining the desired droplet size and distribution.

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Abstract

This liquid discharge head has a first flow path and an actuator. The first flow path includes: a discharge hole for discharging liquid; a pressure chamber communicating with the discharge hole; and a portion on at least the pressure chamber side of a supply path for supplying the liquid to the pressure chamber. The actuator applies pressure to the pressure chamber. When a rectangular pulse for discharging by pull-push drive is applied to the actuator, the upper limit for each pulse width at which the liquid is ejected as a single droplet without splitting is referred to as the single-droplet upper-limit velocity, and a half of the natural vibration period of the liquid in the first flow path is referred to as AL. In this case, in the liquid discharge head, a predetermined condition relating to the minimum value of the single-droplet upper-limit velocity when the pulse width is within the range of AL ± 25% is satisfied.
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Citation Information

Patent Citations

  • Liquid ejecting apparatus, and control method of the same

    JP2013248750A

  • Liquid jetting device

    US20220016884A1

  • Liquid discharge head and recording device using same

    WO2010137435A1