Liquid Ejecting Head Pressure Chamber Segmentation
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Solution Overview
Problem
Existing liquid ejecting heads face challenges in maintaining effective ejection characteristics due to pressure escape in pressure chambers, particularly when multiple pressure chambers communicate with a common liquid chamber, leading to inefficiencies in ink ejection.
Innovation Solution
The design incorporates a pressure chamber substrate with distinct communication channels and common liquid chambers, allowing for efficient pressure transfer between adjacent pressure chambers and nozzles, reducing channel resistance and enhancing ejection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two pressure chambers communicate with a single common liquid chamber, then the number of common liquid chambers is reduced, but pressure readily escapes from the pressure chambers
Solution Approach 1:
The liquid chamber is segmented into a common liquid chamber and multiple communication channels, with each communication channel serving specific pressure chambers. This segmentation allows pressure to be directed through specific pathways rather than escaping freely into a large common chamber, thus maintaining pressure while reducing the number of separate common liquid chambers needed.
Solution Approach 2:
Communication channels act as intermediaries between the pressure chambers and the common liquid chamber. These channels control and regulate the flow of liquid and pressure, preventing direct and uncontrolled pressure escape to the common chamber while still allowing necessary communication and liquid supply.
2Device complexity
If multiple pressure chambers share a common communication channel, then device complexity is reduced, but pressure transfer efficiency decreases
Solution Approach 1:
Different communication channels are designed with different characteristics suited to their specific functions. Channels communicating with different pressure chambers have optimized dimensions and configurations tailored to their local requirements, ensuring efficient pressure transfer for each chamber while maintaining overall system simplicity.
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 improves ejection characteristics by minimizing pressure loss and increasing channel resistance, allowing for more efficient ink ejection and reduced viscosity, while simplifying the pressure chamber substrate design and reducing the risk of air bubbles.
Implementation Method 1
a piezoelectric element that changes pressure in the pressure chamber
Data Source
AI summary
A communication plate in which are provided a first communication channel communicating with the first pressure chamber and the second pressure chamber and a first common liquid chamber communicating with the first pressure chamber and the second pressure chamber at positions different from positions at which the first communication channel communicates with the first pressure chamber and the second pressure chamber, and a nozzle substrate in which a first nozzle communicating with the first pressure chamber and the second pressure chamber in common via the first communication channel is provided. A second communication channel communicating with the first common liquid chamber and communicating with the first pressure chamber and the second pressure chamber in common is provided in the pressure chamber substrate or the communication plate.