Liquid Ejection Head Sealing Groove Design
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Solution Overview
Problem
Conventional liquid ejection heads suffer from poor sealing properties, allowing ink mist to enter the pressurizing region and potentially cause issues with the pressurizing part.
Innovation Solution
The liquid ejection head incorporates a sealing member between the cover member and the channel member, which seals the groove in the pressurizing chamber surface, preventing ink mist from reaching the pressurizing region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover member is provided standing on the channel member without additional sealing structures, then the device complexity is reduced, but the sealing property deteriorates allowing ink mist to enter the pressurizing region
Solution Approach 1:
A sealing member is introduced as an intermediary element between the cover member and channel member. This sealing member fills the groove and creates a reliable seal that prevents ink mist from entering the pressurizing region, while the groove itself provides a simple structural framework for accommodating the sealing member.
Solution Approach 2:
The sealing member functions as a flexible sealing element that can deform to accommodate manufacturing tolerances and assembly variations. This flexible sealing structure provides reliable sealing without requiring complex rigid sealing mechanisms, thus improving sealing property while maintaining relatively simple device complexity.
2Reliability
If the sealing member is positioned between the cover member and channel member, then the sealing property is improved, but the device complexity increases due to additional components
Solution Approach 1:
The groove is integrated directly into the channel member structure, merging the sealing feature with the existing component. This reduces the number of separate parts needed, as the groove serves both as a structural feature and as the accommodation space for the sealing member, thereby improving sealing without proportionally increasing device complexity.
Solution Approach 2:
The groove in the channel member serves multiple functions: it provides structural support, defines the positioning of the cover member, and accommodates the sealing member. This multi-functionality reduces the need for additional dedicated sealing structures, improving sealing property while minimizing the increase in device complexity.
Data Source
AI summary
A liquid ejection head includes a channel member, a pressurizing part, a cover member, and a sealing member. The channel member includes an ejection hole, a pressurizing chamber, an ejection hole surface, and a pressurizing chamber surface. The pressurizing chamber is connected with the ejection hole. The ejection hole surface is positioned on the ejection hole side. The pressurizing chamber surface is positioned on the pressurizing chamber side. The pressurizing part is positioned in a pressurizing region in the pressurizing chamber surface. The cover member stands on the channel member. The sealing member seals the cover member and the channel member. The channel member includes a groove positioned in the pressurizing chamber surface but outside the pressurizing region. The cover member is positioned in the groove. Further, the sealing member is positioned between a fixing portion in the cover member which is positioned in the groove and the groove.