Ink-jet Print Head Temperature Correction via Dual Sensor Feedback
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Solution Overview
Problem
In ink-jet printing apparatuses, temperature corrections for diode sensors are often incomplete due to manufacturing errors and temperature differences between the print head and the ambient environment, leading to improper temperature control and potential standby states until corrections are executed.
Innovation Solution
An ink-jet printing apparatus with a print head and both a first detecting element within the print head and a second detecting element within the apparatus, where temperature corrections are made based on information acquired at different time points to ensure accurate temperature control without causing a waiting period for printing to start.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If temperature correction is performed immediately after print head mounting, then productivity is improved by avoiding standby time, but measurement precision deteriorates due to temperature deviation between print head and ambient environment
Solution Approach 1:
The system performs preliminary temperature acquisition at multiple time points (immediately after mounting, after predetermined time, and before printing) to prepare correction data in advance. This allows the correction to be ready before printing starts, avoiding standby time while ensuring accurate temperature measurement when the print head has stabilized.
Solution Approach 2:
The system continuously monitors temperature at multiple time points and uses the temperature difference between the first time point (immediately after mounting) and second time point (after predetermined time) to calculate and apply correction values. This feedback mechanism ensures that the diode sensor readings are corrected based on actual temperature stabilization behavior.
2Manufacturing precision
If temperature correction uses thermistor with stable characteristics, then manufacturing precision is improved, but response speed deteriorates due to lower heat responsiveness
Solution Approach 1:
The system merges the advantages of both diode sensors and thermistors by using the diode sensor in the print head for rapid temperature detection during printing, while using the thermistor in the main body for stable reference temperature measurement. The correction value combines these two sensor types to achieve both speed and stability.
Solution Approach 2:
The correction value acts as an intermediary that translates the stable but slow thermistor readings into corrected temperature values for the fast but less stable diode sensor. This mediator allows the system to use the rapid response of the diode sensor while compensating for its manufacturing variations through the thermistor's stable reference.
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 approach allows for proper temperature correction of diode sensors without introducing waiting times, ensuring accurate temperature control and preventing standby states, thereby enabling immediate start of printing operations.
Implementation Method 1
a diode sensor having excellent heat responsiveness is used as the temperature sensor in the print head
Implementation Method 2
Use of a thermistor of as the temperature sensor has also been known because manufacturing errors for thermistors do not occur easily
Implementation Method 3
a print head having a plurality of printing elements which generate power for discharging ink
Data Source
AI summary
In a case where the temperature difference between first and second time points detected by a first temperature sensor provided in a print head is lower than a threshold temperature, a temperature correction for the first temperature sensor is performed based on a temperature detected by a second temperature sensor provided within a printing apparatus thereof. In a case where the temperature difference is higher than the threshold temperature, a temperature correction for the first temperature sensor is performed without using the temperature detected by the second temperature sensor.