Print Element Substrate Point-Symmetric Layout for Kogation Prevention
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Solution Overview
Problem
Print element substrates used in liquid discharge heads face challenges in maintaining effective functional element performance due to point-symmetric arrangement of print elements and drive circuits, which can reduce the impact of functional elements on ink circulation and discharge, leading to decreased printing quality and increased design load.
Innovation Solution
The print element substrate is designed with print element rows arranged in a second direction crossing the first direction, with drive circuits and functional elements point-symmetric about the substrate center, and functional elements positioned in the direction of ink flow from supply ports to collection ports, allowing for efficient ink circulation and reduced design load while preventing kogation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If print elements and drive circuits are arranged point-symmetrically about the center of the substrate, then the layout design load is reduced and substrate size is controlled, but the effectiveness of functional elements affecting liquid flow is decreased
Solution Approach 1:
The patent resolves the contradiction by separating the arrangement dimensions: print elements and drive circuits are arranged point-symmetrically in the horizontal plane (reducing design load), while functional elements affecting liquid flow are arranged in the vertical dimension above the liquid flow path (maintaining effectiveness). This multi-dimensional arrangement allows both requirements to be satisfied simultaneously.
2Shape
If functional elements are arranged point-symmetrically about the center of the substrate, then the layout is balanced, but the effect of functional elements on liquid flow is reduced
Solution Approach 1:
The patent applies local quality by making different parts of the substrate serve different functions: the horizontal plane maintains point-symmetric balance for structural integrity, while the vertical space above the liquid flow path is dedicated to functional elements that locally control liquid flow. This localized functional arrangement ensures liquid flow control effectiveness while maintaining overall layout balance.
3Productivity
If print element substrates are highly condensed and downsized, then the number of substrates produced from one wafer increases, but the arrangement of functional elements becomes more difficult
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension above the liquid flow path for arranging functional elements. This approach allows functional elements to be positioned without increasing the horizontal substrate footprint, thereby maintaining high condensation and production efficiency while simplifying functional element arrangement through vertical separation.
Data Source
AI summary
In a layer including print elements and a layer below the layer including the print elements in a lamination direction of a print element substrate, the print elements and drive circuits are arranged point-symmetrically about the center of the substrate viewed from a side where discharge ports that allow the liquid to be discharged are open, and in an upper layer over the layer including the print elements in the lamination direction, functional elements are arranged in a direction of liquid flow in which the liquid flows from supply ports to collection ports while passing above the print elements.