Liquid Ejecting Head Protrusion Sections for Ink Adhesion Control
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Solution Overview
Problem
In liquid ejecting techniques, the issue arises where liquid remaining on the ejection surface with nozzles adheres to the medium due to insufficient suppression of contact between the medium and the nozzle forming surface, particularly as the nozzle area increases.
Innovation Solution
The implementation of a liquid ejecting head with protrusion sections on the ejection surface that protrude towards the liquid ejection side, intersecting the boundary of abutting regions, effectively reducing medium contact with the ejection surface and minimizing ink adhesion to the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the nozzle forming surface area is increased, then the liquid ejection coverage is improved, but the contact between the medium and the ejection surface cannot be effectively suppressed
Solution Approach 1:
The ejection surface is divided into multiple regions: abutting regions where sealing bodies contact, and protrusion regions with protrusion sections that extend toward the medium. This segmentation allows different zones to serve different functions - sealing and contact prevention - simultaneously, resolving the contradiction between maintaining sealing performance and preventing medium contact
Solution Approach 2:
Protrusion sections act as intermediary elements between the ejection surface and the medium. These protrusions create a physical barrier that prevents direct contact between the medium and the ejection surface, while still allowing the sealing bodies to function properly in their abutting regions
2Object-affected harmful factors
If movable piece sections are provided in the periphery of the nozzle forming surface, then contact suppression is improved, but the solution becomes ineffective when the nozzle area increases
Solution Approach 1:
Instead of uniformly distributing movable pieces around the periphery, the invention creates localized protrusion sections specifically in regions where medium contact is most likely to occur. This local quality approach makes the contact prevention more effective and scalable to larger nozzle areas without requiring proportional increases in peripheral structures
3Object-affected harmful factors
If protrusion sections are formed on the ejection surface, then medium contact is reduced, but the complexity of the ejection surface structure increases
Solution Approach 1:
The protrusion sections are integrated directly into the ejection surface structure rather than being separate components. This merging approach reduces the number of parts and simplifies manufacturing while maintaining the contact prevention function, offsetting the structural complexity with manufacturing efficiency
Data Source
AI summary
A liquid ejecting head includes an ejection surface which extends in a first direction (X-direction) and on which a plurality of nozzles ejecting a liquid are distributed; and protrusion sections that are formed on the ejection surface and protrude on a liquid ejection side in which the liquid is ejected. The ejection surface has abutting regions on which a sealing body that seals the plurality of nozzles by surrounding the plurality of nozzles abuts. When projecting the abutting regions and the protrusion sections along a first direction (X-direction) on a virtual line along a second direction (Y-direction) intersecting the first direction, the protrusion sections are disposed on the ejection surface such that projection of the protrusion sections crosses a boundary of projection of the abutting regions.