Liquid Ejection Head Die Slide Injection Molding
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Solution Overview
Problem
Existing methods of manufacturing liquid ejection heads, which involve screwing with elastic members, often result in deformation and compromised dimensional accuracy due to reactive forces, affecting the precision of the recording element unit and liquid flow path member.
Innovation Solution
A method using die slide injection molding to form a liquid ejection head with a liquid flow path member comprising a first portion, a second portion, and a sealing portion, where the first and second portions are joined without screws, and the sealing portion is formed by molten resin, ensuring high dimensional accuracy and excellent liquid contact properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic members and screws are used to assemble the recording element unit and liquid flow path member, then seal characteristics are improved, but dimensional accuracy and precision are compromised due to deformation from reactive forces
Solution Approach 1:
The sealing function and joining function are merged into a single integral resin structure. The liquid flow path member is formed as one piece that simultaneously provides both sealing and mechanical connection, eliminating the need for separate elastic members and screws. This integration resolves the contradiction by achieving both reliable sealing and high dimensional accuracy without the deformation caused by assembly fasteners.
Solution Approach 2:
The mechanical assembly system using screws and elastic members is replaced with a resin-based joining system. The resin material provides both sealing and structural connection through its inherent properties, substituting the mechanical fastening system that caused deformation. This replacement achieves reliable sealing while maintaining dimensional accuracy.
2Adaptability or versatility
If multiple separate components are assembled together, then adaptability and ease of repair are improved, but device complexity and potential for deformation increase
Solution Approach 1:
Multiple functional components (sealing elements, structural members, liquid flow paths) are merged into a single integral resin structure. This reduces assembly complexity while maintaining adaptability, as the resin component can be designed to accommodate different recording element units and liquid supply systems without requiring complex assembly procedures.
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
The method achieves a liquid ejection head with high dimensional accuracy and improved liquid contact properties, reducing deformation and maintaining precision in the assembly process.
Implementation Method 1
having a molten resin that is to become the first portion flow in between a first position in a first mold and a first position in a second mold
Implementation Method 2
at least portions of the first portion and the sealing portion are mixed with each other, at least portions of the second portion and the sealing portion are mixed with each other
Data Source
AI summary
A method of manufacturing a liquid ejection head including a first step of having a molten resin becoming a first portion flow in between a first position in a first mold and a first position in a second mold and the molten resin becoming a second portion flow in between a second position in the first mold and a second position in the second mold; a second step of relatively moving the first and second molds, after opening the molds; a third step of closing the molds; a fourth step of joining the first and second portions, a fifth step of taking out the first and second portions and the sealing portion from the molds and mounting a recording element substrate; and a step of forming a space portion between a liquid supply path surface and a mounting surface.