Liquid Ejection Head Temperature Detection Sensitivity
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Solution Overview
Problem
Existing liquid ejection heads with temperature detection elements suffer from decreased sensitivity due to protective layers that reduce the accuracy of liquid temperature detection.
Innovation Solution
A liquid ejection head design that includes a temperature detection element formed on a protective layer, allowing direct contact with the liquid and enhancing sensitivity, along with optional heating mechanisms to further improve temperature detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is formed on the temperature detection element, then the heating element and wiring layer are protected from the liquid, but the sensitivity of liquid temperature detection decreases
Solution Approach 1:
The patent introduces a protective layer as an intermediary between the temperature detection element and the liquid. This protective layer allows thermal energy to pass through while providing mechanical and chemical protection, serving as a mediator that balances protection needs with detection sensitivity requirements
Solution Approach 2:
The protective layer is implemented as a thin film structure that provides protection while minimizing interference with heat transfer. The thin film configuration allows thermal energy to penetrate effectively, maintaining temperature detection sensitivity while still providing necessary protection to underlying components
2Measurement precision
If the temperature detection element is placed closer to the liquid, then temperature detection sensitivity improves, but the risk of damage from liquid exposure increases
Solution Approach 1:
The protective layer acts as an intermediary barrier that enables the temperature detection element to be positioned close to the liquid for high sensitivity detection while simultaneously protecting against liquid exposure damage. The layer transmits thermal signals while blocking harmful liquid contact
3Ease of manufacture
If the temperature detection element is formed directly on the base substrate, then manufacturing is simplified, but temperature detection sensitivity decreases
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked configuration. The temperature detection element is formed on the protective layer in the vertical dimension, allowing it to be positioned closer to the liquid while maintaining manufacturing feasibility through sequential layer formation processes
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
The design achieves high sensitivity in liquid temperature detection, reducing the occurrence of erroneous ejection detection and improving the overall accuracy of liquid ejection operations.
Implementation Method 1
a heating element heats the liquid to eject the liquid from the ejection port
Implementation Method 2
the temperature detection element detects a temperature of the liquid
Data Source
AI summary
A liquid ejection head including a base substrate, an ejection port to eject a liquid, a heating element formed above the base substrate that heats the liquid to eject the liquid from the ejection port, a temperature detection element formed above the base substrate that detects a temperature of the liquid, a wiring layer connected to the heating element, a protective layer formed on the base substrate that protects the heating element and the wiring layer from the liquid, and a liquid supply port that penetrates the base substrate and supplies the liquid to the ejection port. When viewed in a direction perpendicular to the base substrate, the temperature detection element is disposed between the heating element and the liquid supply port, and the temperature detection element is formed on the protective layer.