Liquid Ejecting Head Positioning Without Parallelogram Flange
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Solution Overview
Problem
Existing liquid ejecting heads with a parallelogram-shaped ejection surface face challenges in minimizing size and optimizing positioning due to the lack of a flange portion that corresponds to the parallelogram shape, leading to increased dimensions in both the extending and intersecting directions.
Innovation Solution
A liquid ejecting head design featuring first and second positioning portions disposed orthogonally to the ejection surface, with a specific outer shape that includes inclined edges and end portions, allowing the holding member to be positioned without overlapping a virtual parallelogram, thereby minimizing the head's size and improving alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a flange portion corresponding to the parallelogram shape is provided with positioning portions, then positioning accuracy is improved, but the liquid ejecting head is enlarged in both the extending direction and the intersecting direction
Solution Approach 1:
The patent extracts the positioning function from the flange portion by providing positioning portions directly on the ejection surface. This separates the positioning function from the support function, allowing the head to be compact while maintaining accurate positioning. The positioning portions are taken out from the traditional flange location and integrated into the ejection surface structure.
Solution Approach 2:
The patent changes the dimensional arrangement by positioning the positioning portions on the ejection surface rather than on the flange portion. This spatial reorganization allows positioning to occur in a different location, avoiding the need to enlarge the flange portion and thus preventing head enlargement in both extending and intersecting directions.
2Stability of the object's composition
If the liquid ejecting head is enlarged to accommodate positioning portions on a parallelogram flange, then positioning stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the positioning function with the ejection surface structure by integrating positioning portions directly onto the ejection surface. This consolidation eliminates the need for a separate enlarged flange portion, reducing structural complexity while maintaining positioning stability. The positioning and ejection functions are combined in a unified compact structure.
Solution Approach 2:
The ejection surface is given multiple functions: it serves both as the liquid ejection interface and as the positioning interface through the integrated positioning portions. This multi-functionality eliminates the need for separate positioning structures, simplifying the overall head structure while ensuring stable positioning.
Data Source
AI summary
A liquid ejecting head includes an ejection surface including head chips, and a first-positioning-portion and a second-positioning-portion disposed in a second-direction orthogonal to a first-direction with respect to the ejection surface and positioning a holding member, the liquid ejecting head has a first-edge and a second-edge separated from each other in the first-direction and extending along a third-direction parallel to the ejection surface and inclined with respect to the first-direction and the second-direction, and one end portion and the other end portion forming both end portions in the second-direction, and the first-positioning-portion does not overlap a virtual parallelogram having a first-virtual side contacting the first-edge and extending along the third-direction, a second-virtual side contacting the second-edge and extending along the third-direction, a third-virtual side contacting the one end portion and extending along the first-direction, and a fourth-virtual side contacting the other end portion and extending along the first-direction.