Liquid Ejection Head Dry Film Attachment Uniformity
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Solution Overview
Problem
The existing methods for manufacturing liquid ejection heads result in variations in the shape of the attached dry film depending on location, leading to inconsistent liquid ejection and difficulties in forming predetermined images on a recording medium due to changes in the shape of the flow passages and ejection ports.
Innovation Solution
A method involving a substrate with a layer having multiple opening portions, including an additional opening beyond the outermost opening in the array direction, to ensure uniform attachment and formation of the dry film, thereby stabilizing the shape and height of the flow passages and ejection ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dry film is attached to a substrate to form flow passages, then the liquid ejection head can be manufactured, but the shape of the attached dry film varies depending on location causing inconsistent liquid ejection
Solution Approach 1:
The patent applies preliminary action by forming a protrusion on the substrate before attaching the dry film. This protrusion pre-establishes a reference structure that guides the dry film attachment process, ensuring that the dry film is positioned and shaped consistently across different locations on the substrate, thereby resolving the shape variation issue while maintaining ease of manufacture
Solution Approach 2:
The patent changes the physical parameters of the substrate by adding a protrusion with specific height and position. This parameter modification creates a standardized reference point that controls the dry film's shape during attachment, ensuring uniformity across the substrate surface without complicating the manufacturing process
2Ease of manufacture
If the shape of flow passages and ejection ports changes depending on location, then manufacturing is simplified, but liquid ejection becomes inconsistent making it difficult to form predetermined images
Solution Approach 1:
The protrusion is formed on the substrate before dry film attachment as a preliminary structural element. This pre-formed feature serves as a template that ensures consistent flow passage and ejection port shapes across different locations, thereby maintaining manufacturing simplicity while improving liquid ejection reliability
Solution Approach 2:
By introducing a protrusion with controlled height and position parameters, the patent modifies the substrate's geometric parameters to standardize the dry film's final shape. This parameter control ensures uniform liquid ejection characteristics across all locations without adding significant manufacturing complexity
Data Source
AI summary
A method for manufacturing a liquid ejection head including the steps of preparing a substrate including, on a surface of the substrate, a layer having a plurality of openings in which opening portions of supply portions are located and which are arrayed in an array direction and another opening which is different from the plurality of openings and is located beyond the array end portion in the array direction, and attaching a dry film for forming flow passages to the substrate and the layer.