Liquid Ejecting Head Sensor Integration
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Solution Overview
Problem
Existing liquid ejecting heads face challenges in size increase due to the positional relationship between humidity and temperature sensors, which can affect the precision and efficiency of ink ejection.
Innovation Solution
The liquid ejecting head incorporates a piezoelectric element, a humidity detection unit, and a temperature detection unit, where the piezoelectric body is positioned between the temperature detection resistor and the humidity detection unit, and at least one of the detection electrodes overlaps the temperature detection resistor in the direction of lamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both humidity sensor and temperature sensor are provided inside the case unit, then detection functionality is improved, but the liquid ejecting head increases in size
Solution Approach 1:
The patent combines the humidity sensor and temperature sensor into a single integrated detection unit. The humidity detection unit includes a first detection electrode, a second detection electrode, and an interposed layer, while the temperature detection unit includes a temperature detection resistor. By merging these detection functions into one compact unit rather than providing separate sensors, the patent achieves both detection functionalities while minimizing the overall size increase of the liquid ejecting head.
Solution Approach 2:
The patent positions the detection electrodes and temperature detection resistor in a layered structure with overlap in the direction of lamination. Specifically, at least one of the first detection electrode, the interposed layer, or the second detection electrode is provided at a position to overlap the temperature detection resistor in the direction of lamination. This three-dimensional arrangement allows both sensors to occupy the same spatial footprint, effectively reducing the volume increase while maintaining both detection capabilities.
2Volume of moving object
If humidity sensor and temperature sensor are positioned close together, then space utilization is improved, but electric conduction between sensors may cause detection failure
Solution Approach 1:
The patent introduces an interposed layer as an intermediary between the humidity detection electrodes and the temperature detection resistor. This interposed layer acts as an electrical insulator that prevents direct electric conduction between the humidity sensor components and the temperature detection resistor, thereby avoiding detection failures while still allowing the sensors to be positioned close together for efficient space utilization.
3Device complexity
If detection units are integrated into the piezoelectric element structure, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the detection unit into distinct functional components: a humidity detection unit with first and second detection electrodes and an interposed layer, and a temperature detection unit with a temperature detection resistor. The piezoelectric body is positioned between these two detection units in the direction of lamination. This segmentation allows each component to be manufactured and positioned independently, reducing the overall manufacturing precision requirements while maintaining integrated structure.
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 effectively suppresses the increase in size of the liquid ejecting head and prevents failures in humidity detection due to electric conduction with the temperature detection resistor, ensuring precise ink ejection.
Implementation Method 1
a piezoelectric element in which a first drive electrode, a piezoelectric body, and a second drive electrode are laminated
Implementation Method 2
a temperature detection unit used for detecting a temperature which includes a temperature detection resistor
Implementation Method 3
a humidity detection unit used for detecting a humidity which includes a first detection electrode, an interposed layer, and a second detection electrode
Data Source
AI summary
A liquid ejecting head includes a piezoelectric element in which a first drive electrode, a piezoelectric body, and a second drive electrode are laminated, a humidity detection unit used for detecting a humidity, which includes a first detection electrode, an interposed layer, and a second detection electrode, and a temperature detection unit used for detecting a temperature, which includes a temperature detection resistor. The piezoelectric body is provided between the temperature detection resistor and the humidity detection unit in a direction of lamination in which the first drive electrode, the piezoelectric body, and the second drive electrode are laminated, and at least one of the first detection electrode, the interposed layer, and the second detection electrode is provided at a position to overlap the temperature detection resistor in the direction of lamination.