Liquid Discharge Head Wiring Board Segmentation
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Solution Overview
Problem
In liquid discharge heads, the increased number of energy generating elements and corresponding connecting terminals leads to a wider electric wiring board, resulting in thermal expansion misalignment between the wiring portion and the electric wiring board, causing connection failures and short circuits due to differing coefficients of linear expansion.
Innovation Solution
A cut portion is introduced in the connecting portion of the electric wiring board, dividing it into smaller strips, which reduces the width-related elongation and misalignment, thereby minimizing the risk of connection failures and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the width of the electric wiring board is increased to accommodate more connecting terminals, then the number of energy generating elements and connecting terminals can be increased, but the misalignment of relative position between the electric wiring board and wiring portion increases due to thermal expansion
Solution Approach 1:
The connecting portion of the electric wiring board is divided into multiple independent sections by introducing cut portions. This segmentation reduces the width of each section, thereby reducing thermal expansion-induced elongation in each segment and minimizing misalignment between corresponding terminals on the wiring board and wiring portion.
2Quantity of substance
If the width of the electric wiring board is increased to accommodate more connecting terminals, then the number of energy generating elements and connecting terminals can be increased, but the probability of connection failure and short circuit increases
Solution Approach 1:
By dividing the connecting portion into smaller segments through cut portions, the thermal expansion-induced misalignment is reduced, which directly improves connection reliability and reduces the probability of connection failure or short circuit between adjacent terminals.
3Quantity of substance
If the width of the electric wiring board is increased to accommodate more connecting terminals, then the number of energy generating elements and connecting terminals can be increased, but the size of the electric wiring board increases
Solution Approach 1:
The cut portions divide the connecting portion into multiple narrow segments, allowing the board to accommodate more terminals along the length direction without proportionally increasing the overall width, thus optimizing the area utilization.
Solution Approach 2:
Instead of arranging all connecting terminals in a wide single-row configuration, the cut portions enable a more compact arrangement that utilizes the length dimension more effectively, reducing the required width while maintaining the number of terminals.
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
The reduced elongation of the electric wiring board's connecting portion effectively minimizes positional misalignment and enhances the reliability of connections, reducing the occurrence of connection failures and short circuits while maintaining a smaller width for the electric wiring board.
Implementation Method 1
a magnitude of thermal expansion is different between the electric wiring board and the wiring portion at the time of connection (at the time of thermocompression bonding) depending on the difference coefficient of linear expansion between these base materials
Data Source
AI summary
A liquid discharge head includes a wiring portion; a print element board including an element for applying discharge energy to liquid; and an electric wiring board including a connecting portion connected to the wiring portion and electrically connecting the wiring portion and the print element board. The connecting portion is provided with a cut portion at a position between both end portions in a width direction of the connecting portion, and a length of the cut portion in the width direction is shorter than a length of the cut portion in a direction orthogonal to the width direction.