Recording Head Temperature Calibration via Dual Sensor Feedback
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Solution Overview
Problem
Existing recording apparatuses face challenges in accurately calibrating the temperature of the recording head due to variations in diode sensor characteristics and the requirement that the recording head temperature must be substantially equal to the environmental temperature for accurate calibration, which is difficult to maintain especially when a heating mechanism is present.
Innovation Solution
The proposed solution involves a recording apparatus equipped with a recording head, a heating unit, a first temperature sensor in the recording head to detect the recording head's temperature, and a second temperature sensor to detect the ambient temperature. A correction value is calculated based on the detections from both sensors during the apparatus's power-on period and before the heating unit is driven, allowing for accurate temperature calibration of the recording head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a diode sensor is used to detect the temperature of the recording head, then thermal responsiveness is improved, but measurement precision deteriorates due to variations in characteristics from manufacturing errors
Solution Approach 1:
The patent applies feedback by using a thermistor to detect environmental temperature and generating a correction value based on the difference between the diode sensor's detected temperature and the environmental temperature. This correction value is fed back to adjust the recorded temperature, compensating for the diode sensor's characteristic variations and improving measurement precision while maintaining thermal responsiveness.
2Measurement precision
If calibration is performed when the recording head temperature is substantially equal to environmental temperature, then measurement precision is improved, but the heating mechanism prevents this condition from being met
Solution Approach 1:
The patent applies preliminary action by performing temperature calibration before the heating mechanism is activated. The diode sensor detects the temperature of the recording head in its initial state (before heating), and the thermistor detects the environmental temperature. The correction value is calculated and stored in advance, ensuring that calibration is performed under conditions where the recording head temperature is substantially equal to the environmental temperature, thereby maintaining measurement precision while accommodating the presence of the heating mechanism.
3Measurement precision
If a thermistor is added to detect environmental temperature and calculate correction values, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies the intermediary principle by introducing a thermistor as a mediator to detect environmental temperature. The thermistor serves as an intermediary element that provides the necessary environmental temperature data to calculate a correction value, which then compensates for the diode sensor's inaccuracies. This intermediary approach improves measurement precision by adding a complementary sensing element that works together with the existing diode sensor system.
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 enables precise calibration of the recording head temperature, even in the presence of a heating mechanism, by accounting for variations in sensor readings and ensuring accurate temperature control, thereby improving the overall performance and reliability of the recording apparatus.
Implementation Method 1
a first temperature sensor disposed in the recording head and configured to detect a temperature of the recording head
Implementation Method 2
a second temperature sensor configured to detect a temperature around the recording head
Implementation Method 3
a heating unit configured to heat the recording medium
Data Source
AI summary
A recording apparatus includes a recording head configured to discharge a liquid onto a recording medium to form an image, a heating unit configured to heat the recording medium, a first temperature sensor disposed in the recording head and configured to detect a temperature of the recording head, and a second temperature sensor configured to detect a temperature around the recording head, wherein a correction value for correcting the temperature of the recording head is calculated based on results of detection by the first temperature sensor and the second temperature sensor during a period from when the recording apparatus is powered on to when the heating unit is driven.