Heating Resistance Element Electrode Segmentation for Cavitation Durability
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Solution Overview
Problem
Existing liquid ejection apparatuses face challenges in achieving high-quality, high-durability performance due to the damage of heating elements from cavitation impacts, leading to increased size and cost, and limitations in adjusting droplet size and direction for high-gray-level imaging.
Innovation Solution
A recording-element substrate with a heating resistance element featuring three or more electrodes, allowing for selective formation of heating areas by using different electrode combinations to generate thermal energy, reducing the number of heating elements per ejection port and enhancing durability through reduced pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple heating elements are used per ejection port to improve durability against cavitation impact, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The heating element is segmented into multiple independent heating regions (first heating region, second heating region, third heating region) that can be independently controlled by separate drive circuits. This allows selective activation of heating regions based on operational requirements, reducing the need for multiple complete heating elements while maintaining durability against cavitation impact.
Solution Approach 2:
The heating element incorporates variable resistance characteristics where the resistance changes depending on the heating region and operational state. The drive circuit dynamically adjusts the drive signal based on detected resistance values to optimize heating efficiency and protect against cavitation damage, enabling adaptive control without increasing hardware complexity.
2Adaptability or versatility
If multiple heating elements are used per ejection port to enable droplet direction control, then adaptability is improved, but device complexity increases
Solution Approach 1:
The heating element is divided into multiple spatially distributed heating regions (first, second, and third heating regions) that can be independently activated. By selectively heating different regions, the liquid is heated at different positions, causing bubbles to form at different locations and thereby controlling the ejection direction of droplets without requiring multiple complete heating elements.
Solution Approach 2:
Different heating regions have different resistance characteristics and are optimized for specific functions. The first heating region has different resistance than the second and third regions, allowing localized control of heating properties to achieve precise droplet direction control while maintaining overall system simplicity.
3Productivity
If heating area is increased to improve liquid ejection performance, then productivity is improved, but energy consumption increases
Solution Approach 1:
The drive circuit dynamically adjusts the drive signal based on the detected resistance value of the heating element. When the heating element is wet (liquid present), the resistance is lower and full power is applied for efficient ejection. When dry, the resistance is higher and power is reduced or shut off, preventing energy waste and potential damage while maintaining high productivity when needed.
Solution Approach 2:
The system incorporates resistance detection feedback where the drive circuit measures the resistance of the heating element and adjusts the drive signal accordingly. This feedback mechanism ensures optimal energy utilization by matching power delivery to the actual operational state of the heating element, improving liquid ejection efficiency while minimizing energy consumption.
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 solution enables the creation of high-quality, high-durability liquid ejection apparatuses with reduced size and cost, allowing for precise control of droplet size and direction, thereby achieving high-gray-level imaging while minimizing the impact of cavitation on the heating elements.
Implementation Method 1
a heating resistance element configured to generate thermal energy for ejecting the liquid from the ejection port
Implementation Method 2
The drive circuit forms a heating area that generates thermal energy in the heating resistor layer by selectively using at least two of the three or more electrodes
Data Source
AI summary
A recording-element substrate includes an ejection port configured to eject liquid; a heating resistance element configured to generate thermal energy for ejecting the liquid from the ejection port; and a drive circuit configured to drive the heating resistance element. The heating resistance element includes a heating resistor layer and three pairs of electrodes provided for the heating resistor layer. The drive circuit forms a heating area that generates thermal energy in the heating resistor layer by selectively using two or more of the electrodes.