Print Element Substrate Differential Detection for Ink Discharge Accuracy
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Solution Overview
Problem
Existing printing technologies face challenges in accurately detecting whether ink is appropriately discharged, as the resistive detection elements used for temperature-based detection have limitations in precision.
Innovation Solution
A print element substrate is designed with multiple heating elements and detection elements, along with a current generation unit and signal output unit, which supplies currents to detection elements and outputs a signal based on the potential difference between them, enhancing the accuracy of ink discharge detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a resistive detection element is used to detect temperature changes for determining liquid discharge, then the detection function is achieved, but the measurement precision is insufficient
Solution Approach 1:
The detection system is segmented into multiple independent detection elements (first detection element and second detection element), each connected to separate current generation units. This segmentation allows for differential measurement where potential differences between elements are compared, significantly improving measurement precision for detecting liquid discharge events while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The invention changes the measurement parameter from absolute resistance value detection to differential potential difference detection. By measuring the difference in potential between multiple detection elements rather than absolute values, the system achieves higher sensitivity and precision in detecting temperature changes caused by liquid discharge, effectively resolving the measurement precision limitation.
2Measurement precision
If multiple detection elements are used with separate current generation units, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The current generation units are designed with universal functionality, where each unit can independently supply current to different detection elements. This multi-functional design allows the same circuit architecture to serve multiple detection purposes, improving measurement precision through differential measurement while avoiding the complexity of designing entirely separate circuits for each detection element.
Solution Approach 2:
The signal output unit provides feedback by comparing the potential differences from multiple detection elements and generating an output signal that reflects the differential measurement results. This feedback mechanism enables precise detection of liquid discharge events by continuously monitoring and comparing signals from different detection elements, achieving high measurement precision without proportionally increasing system complexity.
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 the accuracy of ink discharge detection by extending the dynamic range of the output signal, allowing for precise determination of ink discharge status.
Implementation Method 1
A resistive element is used as the heating element. The heating element is driven by energization and thus generates heat energy
Implementation Method 2
A resistive element is used as the detection element, and the electric resistance value of the element varies along with a temperature change caused by liquid discharge
Data Source
AI summary
A print element substrate, comprising a plurality of heating elements, a plurality of detection elements, each configured to detect a temperature of a corresponding heating element, a first current generation unit, a second current generation unit, and a signal output unit, wherein one of the first and second current generation units supplies a current to a first detection element, the other supplies a current to a second detection element, and the signal output unit outputs a signal according to a potential difference between one terminal of the first detection element on a side where a potential variation occurs upon supply of the current and one terminal of the second detection element on a side where a potential variation occurs upon supply of the current.