Liquid Discharging Head Noise-Resistant Temperature Detection
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Solution Overview
Problem
In liquid discharging heads, such as those in inkjet printers, the extension of temperature inspection periods across multiple block cycles due to increased printing speed leads to noise interference from logic circuit operations, causing incorrect determination of inhibited discharging openings, which affects printing quality.
Innovation Solution
A printing element substrate with a temperature detecting element and a data input circuit that outputs heating and latch signals in a manner that prevents noise-generated output values from exceeding a preset threshold, utilizing a mask signal to control the detection period and reduce noise interference during temperature waveform analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inspection period is extended to cover multiple block cycles to ensure accurate temperature detection, then the reliability of discharging opening determination is improved, but noise from logic circuit operations is superimposed on the temperature waveform causing measurement errors
Solution Approach 1:
The patent applies preliminary action by generating the mask signal in advance based on the latch signal timing, and preparing the threshold value before temperature detection begins. This allows the system to pre-identify when noise will occur and set appropriate filtering criteria beforehand, ensuring accurate temperature waveform analysis even when detection spans multiple block cycles
Solution Approach 2:
The mask signal acts as an intermediary element that mediates between the latch signal (which causes noise) and the temperature waveform detection. By using the mask signal to identify noise periods and comparing temperature values against a threshold, the system can distinguish between valid temperature changes and noise-induced fluctuations, thereby resolving the contradiction between extended detection duration and noise interference
2Productivity
If the printing speed is increased to improve productivity, then the block time is reduced, but the inspection period extends across multiple block cycles causing noise interference
Solution Approach 1:
The patent applies dynamics by making the inspection period adaptable to varying printing speeds. The mask signal generation unit dynamically adjusts the timing and duration of noise masking based on the latch signal frequency, which changes with printing speed. This allows the system to maintain accurate temperature detection regardless of whether the inspection period spans one or multiple block cycles
Solution Approach 2:
The system changes the parameter of detection timing by using the mask signal to identify and exclude noise-affected periods from temperature analysis. By dynamically adjusting which portions of the temperature waveform are analyzed based on latch signal timing, the system maintains measurement precision even when the inspection period extends across multiple blocks at high printing speeds
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
Enables accurate determination of inhibited discharging openings even when the inspection period spans multiple block cycles, preventing incorrect determinations and maintaining printing quality by minimizing noise impact on temperature waveform analysis.
Implementation Method 1
a temperature detecting element configured to detect a temperature of the substrate
Implementation Method 2
a heating element configured to heat liquid to discharge the liquid from a discharging opening
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A printing apparatus comprising a printing element substrate, including a substrate including a heating element for heating and discharging liquid and a temperature detecting element for detecting a temperature of the substrate, wherein a detection period, during which a detecting result is obtainable, extends across a plurality of cycles of a latch signal, and a heating enabling signal for discharging the liquid and the latch signal are output such that, in the detection period, an output value of a temperature waveform does not exceed a preset threshold value, the temperature waveform being a temperature waveform of the substrate detected by the temperature detecting element.