Liquid Discharge Head Substrate Wiring Layout for Shared Temperature Sensing
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Solution Overview
Problem
The arrangement of multiple temperature detection elements on a liquid discharge head substrate leads to a widening of the wiring region necessary for connecting these elements, narrowing the wiring regions for discharge elements and increasing wiring resistance, which degrades the characteristics of the liquid discharge head.
Innovation Solution
A shared driving wiring pattern is used to connect multiple temperature detection elements, extending in a direction different from the power and ground wiring patterns for discharge elements, thereby avoiding narrowing of these regions and reducing wiring resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple temperature detection elements are arranged on the substrate to measure temperature of each portion, then temperature measurement capability is improved, but the wiring region for discharge elements narrows and wiring resistance increases
Solution Approach 1:
The patent resolves the wiring space conflict by changing the dimensional arrangement of wiring patterns. Specifically, the power supply wiring pattern and ground wiring pattern are arranged to extend in the first direction (longitudinal direction), while the driving wiring pattern for temperature detection elements extends in the second direction (widthwise direction) at the end portion of the substrate. This orthogonal arrangement in different directions allows multiple temperature detection elements to be connected without narrowing the wiring regions for discharge elements, thereby maintaining low wiring resistance while achieving precise temperature measurement capability.
2Adaptability or versatility
If wiring region narrows, then more space is available for temperature detection elements, but line width of wiring pattern decreases and wiring resistance rises
Solution Approach 1:
The patent extends the driving wiring pattern in the widthwise direction (second direction) to the end portion of the substrate, creating a distributed wiring architecture. This allows temperature detection elements to be arranged across the substrate width without requiring long wiring paths in the longitudinal direction, thereby maintaining adequate line width and low wiring resistance while achieving comprehensive temperature detection coverage.
Solution Approach 2:
The end portion of the substrate serves as an intermediary region where the driving wiring pattern connects to external connection terminals. This intermediary arrangement allows temperature detection elements from different regions of the substrate to be connected to external terminals through a shared wiring path, reducing the need for individual wiring paths for each temperature detection element and thereby maintaining lower wiring resistance.
3Reliability
If a shared driving wiring pattern is used, then wiring region for discharge elements is preserved, but temperature detection element connections become more complex
Solution Approach 1:
The patent segments the wiring functions by separating the power supply/ground wiring patterns (extending in the first direction) from the driving wiring pattern for temperature detection elements (extending in the second direction). This segmentation allows each wiring pattern to be optimized for its specific function without interfering with others, reducing overall wiring complexity while maintaining low wiring resistance for discharge elements.
Solution Approach 2:
By arranging the driving wiring pattern to extend in the widthwise direction (second direction) perpendicular to the power supply and ground wiring patterns (first direction), the patent creates a two-dimensional wiring architecture. This dimensional separation simplifies the routing of temperature detection element connections without complicating the power supply network, as the two wiring systems operate in orthogonal directions and can be independently optimized.
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 arrangement maintains the efficiency of the liquid discharge head by suppressing an increase in wiring resistance and allowing for finer temperature control of the discharge elements, improving the overall performance of the liquid discharge head.
Implementation Method 1
a plurality of temperature detection elements arranged on the substrate to detect a temperature of the substrate
Implementation Method 2
a driving wiring pattern that extends in the second direction to drive the plurality of temperature detection elements
Implementation Method 3
A liquid discharge head that applies energy to a liquid using a discharge element and discharges the liquid from an orifice
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.