Branched Connection Member for Liquid Ejection Head Substrate
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Solution Overview
Problem
In liquid ejection heads, the sparse current density near connection members on the heating resistor element leads to a decrease in energy generation efficiency.
Innovation Solution
An element substrate with a heating resistor element, a wiring layer, and a connection member having branched end portions that extend onto the wiring layer side, connected via multiple second connection portions to the wiring layer, enhancing electrical connectivity and reducing current density issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection members are positioned at intervals from one another, then electrical connection between heating resistor elements and wiring layer is achieved, but current density becomes sparse and energy generation efficiency decreases
Solution Approach 1:
The connection member is divided into multiple second connection portions (first, second, third connection portions) that are positioned at intervals along the wiring layer. This segmentation allows the connection member to maintain electrical connectivity while distributing the current flow across multiple contact points, preventing sparse current density in any single region and thereby resolving the contradiction between achieving reliable electrical connection and maintaining energy generation efficiency.
2Reliability
If multiple connection members are used to connect heating resistor element and wiring layer, then electrical connectivity is improved, but device complexity increases
Solution Approach 1:
Multiple connection functions are merged into a single connection member that integrates the first connection portion connected to the heating resistor element and multiple second connection portions connected to the wiring layer. This merging approach achieves improved electrical connectivity through multiple contact points while avoiding the complexity of having separate connection members, as all connection functions are unified within one integrated structure.
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 configuration prevents a decrease in energy generation efficiency by ensuring efficient energy transmission to the liquid, thereby maintaining high thermal energy generation efficiency while ensuring reliability of the element substrate.
Implementation Method 1
a heating resistor element configured to generate energy for ejecting liquid by generating heat
Data Source
AI summary
An element substrate for a liquid ejection head that ejects liquid includes a heating resistor element configured to generate energy for ejecting liquid by generating heat, a wiring layer configured to supply electric power to the heating resistor element, and a connection member including a first connection portion connected to the heating resistor element and a plurality of second connection portions connected to the wiring layer, and configured to electrically connect the heating resistor element and the wiring layer. The connection member has branched end portions that extend, on a wiring layer side thereof, and is connected to the wiring layer by the plurality of the second connection portions.