Liquid Ejecting Head Temperature Detection via Resistance Wire
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Solution Overview
Problem
Existing liquid ejecting apparatuses face challenges in accurately controlling ink ejection due to temperature differences between ambient temperatures measured externally and the temperatures within the liquid ejecting head's pressure chambers, leading to inadequate ejection control.
Innovation Solution
Incorporating a resistance wire as a temperature detector within the liquid ejecting head, which is electrically coupled to the wiring board, allows for precise temperature measurement within the pressure chambers, enabling the controller to drive the piezoelectric device effectively for accurate ink ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is placed outside the liquid ejecting head to measure ambient temperature, then the temperature measurement is simple and the device structure is simple, but the temperature measurement accuracy for ink in the pressure chamber is insufficient
Solution Approach 1:
The temperature detector is nested within the liquid ejecting head structure, specifically positioned in contact with or adjacent to the pressure chamber. This nested configuration allows the temperature detector to directly measure the temperature of the ink in the pressure chamber, thereby improving measurement accuracy without requiring an external separate measurement system.
Solution Approach 2:
The temperature detector acts as an intermediary element that bridges the gap between the external environment and the internal pressure chamber. By placing the detector within the head structure, it directly senses the thermal conditions of the ink, providing accurate temperature data for ejection control without needing to infer temperature from ambient measurements.
2Reliability
If a temperature sensor is placed outside the liquid ejecting head, then the device structure is simple, but the ejection control appropriateness for ink temperature is insufficient
Solution Approach 1:
The temperature detector is integrated within the liquid ejecting head structure, positioned to directly contact or sense the thermal conditions of the ink in the pressure chamber. This nested configuration ensures that the temperature measurement accurately reflects the actual ink temperature, thereby improving ejection control reliability.
Solution Approach 2:
The temperature detector provides direct feedback on the ink temperature within the pressure chamber to the control system. This feedback mechanism enables the controller to adjust ejection parameters based on actual ink temperature conditions, ensuring appropriate and reliable ejection control.
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 reduces the temperature difference error, ensuring appropriate ejection control for the ink's temperature within the pressure chambers, thereby improving the reliability and accuracy of ink ejection.
Implementation Method 1
a piezoelectric device driven by a controller changes the volume of the pressure chamber
Implementation Method 2
a temperature detector electrically coupled to the wiring board and used to determine a temperature in the plurality of pressure chambers
Data Source
AI summary
A liquid ejecting head includes a piezoelectric device including a first electrode, a second electrode, and a piezoelectric layer, a vibration plate that is deformed when the piezoelectric device is driven, a pressure chamber plate including a pressure chamber whose volume is changed by deformation of the vibration plate, a wiring board, an individual lead electrode through which the wiring board and the first electrode are electrically coupled to each other, a common lead electrode through which the wiring board and the second electrode are electrically coupled to each other, and a resistance wire electrically coupled to the wiring board and used to determine temperature in the pressure chamber.