Liquid Ejection Head Sealing via Moving Discharge Member
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Solution Overview
Problem
Existing liquid ejection heads face issues with insufficient sealing agent application at stepped portions between the recording element board and electrical wiring tape, leading to recess formation, which affects the sealing integrity and increases the size of the ejection head.
Innovation Solution
A method of manufacturing a liquid ejection head involves arranging electrical connecting portions on the recording element board, with the electrical wiring member positioned higher than the ejection port surface, and using a discharge member to apply sealing agent along the electrical connecting portions, ensuring complete coverage without forming recesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap between the recording element board and electrical wiring tape is increased to enable complete sealing agent application, then the sealing integrity is improved, but the size of the liquid ejection head increases
Solution Approach 1:
The patent changes the application approach from a fixed needle position to a moving needle that travels along the stepped portion. By introducing motion in the dimensional space above the step, the sealing agent can reach areas that were previously inaccessible without increasing the gap distance.
Solution Approach 2:
The needle is positioned to discharge sealing agent before reaching the stepped portion, and the sealing agent is applied in advance along the path that leads to the difficult-to-reach area. This preliminary discharge ensures that sufficient sealing agent is deposited on the recording element board surface before the needle moves past the step.
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 approach prevents recess formation, ensures adequate sealing, and maintains a compact ejection head size by optimizing the application of the sealing agent, thereby enhancing the sealing integrity and precision of ink ejection.
Implementation Method 1
relatively moving a discharge member, which is for dropping a sealing agent, toward one end of the arrangement of the electrical connecting portions while dropping the sealing agent onto the electrical wiring member and inside the opening
Data Source
AI summary
A method of manufacturing a liquid ejection head, which includes: preparing a liquid ejection head which includes: a recording element board provided with an ejection port through which liquid is ejected and an energy generator; an electrical wiring member provided with an opening from which the recording element board is exposed; and plural electrical connecting portions for electrically connecting the recording element board and the electrical wiring member relatively moving a discharge member, which is for dropping a sealing agent, toward one end of an arrangement of the electrical connecting portions while dropping the sealing agent onto the electrical wiring member and inside the opening; and relatively moving the discharge member from the one end of the electrical connecting portions to the other end while dropping the sealing agent to seal the electrical connecting portion.