Liquid Ejection Head Nozzle Orientation for Droplet Coalescence

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Solution Overview

Problem

Existing liquid jet heads with multiple nozzles in a single pressure generation chamber face challenges in achieving high concentration and high-speed printing due to the dispersion and expansion of ink droplets, which prevents efficient impact on the ejection target.

Innovation Solution

A liquid ejection head design featuring a pressure generation chamber with a plate and driver configuration, where multiple nozzles are aligned to direct ink droplets towards the center of the impact area, utilizing piezoelectric member partition walls to create pressure fluctuations and ensure coalescence of ink droplets for concentrated printing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple nozzles are arranged in one pressure generation chamber to increase ejection amount, then the ejection efficiency is improved, but the impact dots disperse and expand causing loss of printing concentration and speed

Engineering Contradiction:

Improveejection amountVSAvoidprinting concentration

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The pressure generation chamber is divided into multiple independent pressure generation chambers, with each chamber responsible for ejecting liquid through its own nozzles. This segmentation prevents liquid from multiple nozzles in the same chamber from mixing and dispersing, thereby maintaining printing concentration while still achieving high ejection amounts through the collective action of multiple chambers.

Inventive Principle:

Principle #1Segmentation

2Speed

If multiple nozzles eject liquid from one pressure generation chamber, then ejection speed increases, but the dispersed impact dots prevent high-speed printing

Engineering Contradiction:

Improveejection speedVSAvoidhigh-speed printing capability

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

By dividing the single pressure generation chamber into multiple independent chambers, each chamber maintains precise control over its ejection timing and liquid trajectory. This allows multiple high-speed ejections to occur simultaneously without the liquids mixing and dispersing, thereby preserving both ejection speed and the concentrated impact needed for high-speed printing.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design enables efficient high concentration and high-speed printing by ensuring ink droplets coalesce at the impact area, preventing dispersion and maintaining a focused dot area, thus enhancing printing quality.

Implementation Method 1

a driver configured to enable a pressure in the pressure generation chamber to fluctuate

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS9346268B2Liquid ejection head with nozzles ejecting liquid from a pressure generation chamber

Publication Date: 2016.05.24 RISO TECH CORP

AI summary

In accordance with an embodiment, a liquid ejection head comprises a pressure generation chamber in which liquid is filled; a plate configured to connect with the pressure generation chamber and include a plurality of liquid ejection sections of which the axes are directed to the center direction of an impact area of the liquid; and a driver configured to enable a pressure in the pressure generation chamber to fluctuate.