Liquid Ejection Head Sealing via Asymmetric Raised Part

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Solution Overview

Problem

Conventional liquid ejection heads face challenges in preventing liquid inflow and ensuring uniform sealing between the first and second channel members, leading to potential leakage and deformation, which affects printing quality and reliability.

Innovation Solution

The design incorporates a second channel member with a raised part and first through holes positioned on the outer side of the fourth surface, allowing for uniform pressing and improved sealing between the first and second channel members, reducing the likelihood of liquid leakage and deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the second channel member is positioned directly over the pressurizing member, then the structure is compact, but liquid may leak and the sealing becomes non-uniform

Engineering Contradiction:

Improvehead volumeVSAvoidsealing reliability

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent extracts the second channel member from direct positioning over the pressurizing member, relocating it to a region where the pressurizing member is not arranged. This separation prevents liquid leakage and ensures uniform sealing between the first and second channel members, while the raised part with first through holes maintains the compact structure.

Inventive Principle:

Principle #2Taking out (Extraction)

2Volume of moving object

If the second channel member is positioned directly over the pressurizing member, then the structure is compact, but deformation occurs affecting printing quality

Engineering Contradiction:

Improvehead volumeVSAvoidprinting quality

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

3Device complexity

If the raised part outer circumference is on the outer side from the fourth surface outer circumference, then the structure is simple, but sealing becomes non-uniform and leakage occurs

Engineering Contradiction:

Improvechannel member structureVSAvoidsealing reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent employs asymmetric positioning where the raised part's outer circumference is located on the inner side from the fourth surface outer circumference. This asymmetric arrangement creates a stepped configuration that ensures uniform pressing and sealing between the first and second channel members, preventing liquid leakage while maintaining structural simplicity.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS20250010610A1Liquid ejection head and recording device

Publication Date: 2025.01.09 KYOCERA CORP

AI summary

A liquid ejection head in the present disclosure includes a first channel member and a second channel member. The first channel member includes a first surface, a plurality of ejection ports in the first surface, a second surface on the opposite side to the first surface, a third channel, a plurality of pressurizing in communication with the third channel and with the plurality of ejection ports respectively, and a fourth channel. The second channel member is on the second surface and includes a first channel in communication with the third channel and configured using resin and a second channel in communication with the third channel through the forth channel.