Print Liquid Sensor Circuitry for Accurate Level Sensing
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Solution Overview
Problem
Existing print liquid sensing technologies face challenges such as liquid bridging, environmental conditions, and reduced water vapor transmission rates, leading to inaccurate liquid level sensing, frequent supply unit changes, and increased printing costs.
Innovation Solution
A print liquid supply unit equipped with sensor circuitry, including liquid level and strain or pressure sensors, positioned to avoid interference and damage, and constructed from thermoplastics compatible with high-volume manufacturing and environmental conditions, using techniques like laser welding for waterproof seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor circuitry is positioned close to the print liquid for accurate sensing, then measurement precision improves, but the sensor is more susceptible to damage and liquid bridging
Solution Approach 1:
A sensor support structure acts as an intermediary between the sensor circuitry and the print liquid. The support positions the sensor near the liquid surface for accurate measurement while maintaining a protective distance that prevents direct contact and damage. This mediator structure enables the sensor to function effectively without being exposed to harmful factors like liquid bridging and mechanical damage.
2Manufacturing precision
If the print liquid supply unit is frequently changed to ensure accurate liquid levels, then print quality is maintained, but productivity decreases and costs increase
Solution Approach 1:
The sensor circuitry provides real-time feedback about the print liquid level and supply unit status to the printing system. This feedback mechanism enables accurate monitoring of liquid levels, allowing the system to maintain print quality by knowing when liquid replenishment is actually needed, rather than relying on frequent preventive changes. This reduces unnecessary supply unit changes and improves productivity.
3Reliability
If the sensor support structure provides extensive protection for the sensor circuitry, then reliability improves, but device complexity increases
Solution Approach 1:
The sensor support structure provides protection and positioning tailored to the specific needs of the sensor circuitry. Rather than over-engineering the entire support structure, the design focuses protection and structural elements only where the sensor requires support and protection, minimizing unnecessary complexity. The support structure is designed with local quality - providing robust protection at the sensor location while remaining simple in other areas.
Data Source
AI summary
Examples of a print liquid supply unit are described herein. In some examples, the print liquid supply unit includes a regulator assembly. In some examples, the regulator assembly includes an at least partially expandable or contractible pressure chamber. In some examples, the print liquid supply unit includes a port. In some examples, the print liquid supply unit includes sensor circuitry positioned between the regulator assembly and the port in a print liquid reservoir.