Liquid Discharge Head Substrate With Shared Temperature Detection Wiring
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Solution Overview
Problem
The widening of wiring regions for temperature detection elements in liquid discharge heads leads to narrowing of wiring regions for discharge elements, increasing wiring resistance and degrading the characteristics of the liquid discharge head.
Innovation Solution
A driving wiring pattern is shared between multiple temperature detection elements, extending in a direction different from the power and ground wiring patterns for discharge elements, allowing for wider wiring regions and reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple temperature detection elements are arranged to measure the temperature of each portion of the substrate, then the temperature measurement precision is improved, but the wiring region for discharge elements narrows and wiring resistance increases
Solution Approach 1:
Multiple temperature detection elements that were previously connected via separate wiring patterns are merged into a single shared wiring pattern. This consolidation reduces the total wiring area required and prevents the narrowing of wiring regions for discharge elements, thereby maintaining acceptable wiring resistance levels while still enabling multi-point temperature measurement
Solution Approach 2:
The shared wiring pattern serves multiple temperature detection elements simultaneously, making it a universal connection structure. This multi-functional wiring approach allows the same wiring path to connect to multiple sensors without requiring dedicated wiring for each element, thus preserving wiring region space for discharge elements
2Ease of operation
If a wiring pattern is provided for each temperature detection element, then the ease of operation for temperature detection is improved, but the device complexity increases and wiring regions narrow
Solution Approach 1:
Individual wiring patterns for each temperature detection element are merged into a single shared wiring pattern. This reduces the overall complexity of the wiring structure while maintaining the operational simplicity of temperature detection, as the shared wiring still enables easy connection and reading of multiple temperature points
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 suppresses the increase in wiring resistance, maintaining the characteristics of the liquid discharge head and enabling finer temperature control of discharge elements.
Implementation Method 1
a plurality of temperature detection elements arranged on the substrate to detect a temperature of the substrate
Data Source
AI summary
A liquid discharge head substrate includes a substrate, a plurality of liquid discharge elements, a liquid supply port, temperature detection elements, and a driving wiring pattern. The plurality of liquid discharge elements are arranged in a first direction on a major surface of the substrate to discharge a liquid. The liquid supply port is provided in the substrate and is spaced apart from the plurality of liquid discharge elements in a second direction crossing the first direction to supply the liquid to the plurality of liquid discharge elements. The temperature detection elements are arranged on the substrate to detect a temperature. The driving wiring pattern extends in the second direction to an end portion of the substrate to drive the temperature detection elements, is connected to an external connection terminal, and is shared between the temperature detection elements.