Element Substrate Circuit for Noise-Resistant Nozzle Temperature Sensing
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Solution Overview
Problem
Temperature detecting elements in discharge mechanisms for liquids are susceptible to noise interference from surrounding circuits and wires, affecting the accuracy of nozzle state determination.
Innovation Solution
An element substrate design with two temperature detecting elements connected to a common wire maintained at a predetermined potential, along with dedicated output circuits for each, reduces noise influence and enhances accuracy by differentiating temperature sensitivities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature detecting elements are used to monitor heating element temperature, then nozzle state determination is enabled, but noise from surrounding circuits and wires interferes with detection accuracy
Solution Approach 1:
The patent connects both temperature detecting elements to a common wire that is maintained at a predetermined potential (ground potential). This equipotential connection stabilizes the reference level for both detecting elements, preventing potential fluctuations and noise interference from affecting the temperature detection accuracy. By establishing a common reference potential, the circuit becomes immune to electromagnetic interference and voltage fluctuations that would otherwise degrade measurement precision.
2Reliability
If two temperature detecting elements are used for each heating element, then noise influence is reduced through differential measurement, but circuit complexity increases
Solution Approach 1:
The patent merges the reference connections of both temperature detecting elements into a single common wire that is maintained at predetermined potential. Instead of providing separate reference connections for each detecting element, the invention combines them into one shared ground connection. This merging approach maintains the noise-resistant differential measurement capability while significantly simplifying the circuit configuration and reducing the number of required connection wires.
3Stability of the object's composition
If separate reference connections are provided for each temperature detecting element, then individual element stability is ensured, but circuit area increases
Solution Approach 1:
The common wire serves multiple functions simultaneously: it provides the reference potential for both temperature detecting elements, acts as a noise shield, and maintains equipotential conditions across the circuit. By designing this single wire to perform multiple roles, the invention ensures potential stability for both detecting elements without requiring separate reference connections, thereby reducing the overall circuit area while maintaining compositional stability.
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 stabilizes the potential of temperature detecting elements, reducing noise interference and improving the accuracy of nozzle state determination while potentially reducing circuit area.
Implementation Method 1
a first heating element configured to generate thermal energy for discharging a liquid by supply of power
Implementation Method 2
a first temperature detecting element configured to detect a temperature of the first heating element... a second temperature detecting element configured to detect the temperature of the first heating element
Data Source
AI summary
An element substrate includes a first heating element configured to generate thermal energy for discharging a liquid by supply of power, a first temperature detecting element configured to detect a temperature of the first heating element, a second temperature detecting element configured to detect the temperature of the first heating element, a first output circuit configured to energize the first temperature detecting element and output a voltage of one terminal of the first temperature detecting element as temperature information; and a second output circuit configured to energize the second temperature detecting element and output a voltage of one terminal of the second temperature detecting element as temperature information. The other terminal of the first temperature detecting element and the other terminal of the second temperature detecting element are connected to a common wire maintained at a predetermined potential.