Liquid Ejection Head Lid Member for High-Density Passage
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Solution Overview
Problem
Existing liquid ejection heads face challenges in achieving high-density ejection openings and uniform liquid droplet sizes, which are essential for high-quality printing, due to limitations in the size and density of the supply passage near the rear face of the print element board.
Innovation Solution
A manufacturing method for a liquid ejection head that involves forming a lid member with openings communicating with the supply path and cutting adjacent element boards into chips, allowing for a more compact and dense passage structure, thereby stabilizing pressure chamber pressure and improving ejection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the supply opening is processed in the sealing film serving as the support member of the print element board, then the positioning accuracy of the passage near the rear face of the print element board is improved, but it becomes difficult to further decrease the size or increase the density of the supply opening or passage
Solution Approach 1:
The patent divides the element board into multiple adjacent boards that are processed separately and then connected. The lid member is formed on the connected element boards after cutting them into chips, allowing the passage structure to be optimized independently for each board while maintaining overall positioning accuracy through the connection structure.
Solution Approach 2:
The patent transitions from processing the supply opening in the sealing film (two-dimensional surface processing) to forming the lid member with openings in the vertical dimension after element board connection. This dimensional shift allows for more flexible passage design and higher density without compromising positioning accuracy.
2Measurement precision
If multiple ejection openings are disposed with high density, then printing accuracy is improved, but the size of the liquid supply passage must be decreased which complicates the passage structure
Solution Approach 1:
The element board is divided into multiple adjacent boards that are cut into chips and connected with a lid member. This segmentation allows for high-density ejection openings on each board while the lid member provides a standardized connection interface, simplifying the overall passage structure despite the high density of ejection openings.
Solution Approach 2:
The lid member serves multiple functions: it connects adjacent element boards, forms the supply passage openings, and maintains pressure chamber integrity. This multi-functional design simplifies the passage structure by consolidating multiple components into one universal element.
3Device complexity
If the element boards are cut into chips after lid member forming, then the passage structure density is increased, but the pressure chamber pressure stability may be affected
Solution Approach 1:
The lid member is formed on the connected element boards before cutting them into chips. This preliminary action ensures that the passage structure and pressure chambers are established in their final high-density configuration before the cutting process, allowing the pressure stability to be optimized for the intended dense structure from the beginning.
Solution Approach 2:
The lid member acts as an intermediary structure that connects adjacent element boards and maintains pressure chamber integrity during the cutting process. It serves as a stabilizing element that ensures pressure stability is maintained even as the boards are divided into smaller chips with higher density passages.
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 enables a further decrease in passage size and increase in density, leading to improved printing accuracy and quality by maintaining uniform droplet size and pressure stability, enhancing the overall performance of the liquid ejection head.
Implementation Method 1
a lid member forming step of forming a lid member provided with an opening communicating with the supply path
Data Source
AI summary
A liquid ejection head capable of suppressing a change in pressure of a pressure chamber, a liquid ejection apparatus, and a manufacturing method are provided. For that reason, a lid member is formed on a wafer-shaped element board and the element board is cut into chips to manufacture a print element board.