Liquid Discharge Head Temperature Detection via Piezoelectric Penetration
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Solution Overview
Problem
Existing liquid discharge devices face challenges in accurately detecting the temperature of ink within the pressure chamber due to the placement of temperature detection sections outside the liquid discharge head, leading to decreased accuracy.
Innovation Solution
Incorporating a detection resistor within the liquid discharge head, electrically coupled via a first wiring portion that includes a part extending above the piezoelectric body and another part penetrating the piezoelectric body, allowing for improved temperature detection accuracy by reducing wiring length and signal attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the temperature detection section is disposed outside the liquid discharge head, then the device structure is simpler, but the temperature detection accuracy of the ink in the pressure chamber decreases
Solution Approach 1:
The detection resistor is nested within the liquid discharge head structure, specifically positioned below the piezoelectric body and electrically coupled through a wiring portion that penetrates the piezoelectric body. This nesting approach allows the temperature detection function to be integrated into the compact head structure while maintaining close proximity to the pressure chamber for accurate temperature measurement.
Solution Approach 2:
The detection resistor is positioned in a different spatial dimension (below the piezoelectric body) rather than attempting to place it directly adjacent to the pressure chamber. The wiring portion extends through the piezoelectric body to establish electrical connection, effectively using the vertical dimension to achieve both compact integration and accurate temperature detection.
2Measurement precision
If the detection resistor is disposed inside the liquid discharge head, then the temperature detection accuracy is improved, but the wiring structure becomes more complex
Solution Approach 1:
The wiring portion serves multiple functions simultaneously: it provides electrical connection to the detection resistor, penetrates the piezoelectric body to reach the detection element, and is integrated into the existing head structure. This multi-functionality reduces the need for separate wiring components and simplifies the overall wiring structure despite the internal placement of the detection resistor.
3Loss of energy
If the wiring length is reduced, then the energy loss and signal attenuation are minimized, but the wiring layout becomes more constrained
Solution Approach 1:
The wiring portion is designed to penetrate the piezoelectric body at a predetermined location and establish direct electrical connection to the detection resistor. This preliminary routing approach minimizes the wiring length from the detection point to the external connection, thereby reducing energy loss and signal attenuation while maintaining a manageable wiring layout through careful placement.
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
Enhances temperature detection accuracy by minimizing energy loss and signal attenuation, thereby improving the overall performance of the liquid discharge device.
Implementation Method 1
the temperature of the ink in the pressure chamber is acquired by disposing resistance wiring inside the liquid discharge head and using the correspondence relationship between the resistance value of the resistance wiring and the temperature
Implementation Method 2
a piezoelectric body that is driven to apply pressure to liquid in the pressure chambers
Data Source
AI summary
A liquid discharge head includes a pressure chamber substrate that is provided with a plurality of pressure chambers, a piezoelectric body that is driven to apply pressure to liquid in the pressure chambers, an upper electrode that is provided above the piezoelectric body for applying a voltage to the piezoelectric body, a lower electrode that is provided below the piezoelectric body for applying a voltage to the piezoelectric body, a detection resistor that is provided below the piezoelectric body for detecting temperature of the liquid in the pressure chambers, and a first wiring portion that is electrically coupled to the detection resistor. The first wiring portion includes a first part that is extended above the piezoelectric body, and a second part that is provided in at least a part of a through hole penetrating the piezoelectric body and electrically coupled to the detection resistor.