Resin Multilayer Substrate Coil Conductor Width Variation
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Solution Overview
Problem
Conventional resin multilayer substrates with varying coil conductor pattern line widths experience irregular resin flow during hot pressing, leading to positional deviation and deformation of coil conductor patterns, which can result in conductor loss and short circuits.
Innovation Solution
Incorporating a parallel conductor portion with wider linear conductor patterns at the outermost peripheral portion of the coil conductor patterns, connected near the center, reduces resin flow irregularity and maintains positional accuracy during hot pressing, thereby minimizing conductor loss and preventing positional deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the line width of the outermost peripheral portion of the coil conductor pattern is increased, then the conductor loss is reduced and resin flow is suppressed, but if the line widths of multiple coil conductor patterns are made different, then irregular resin flow occurs causing positional deviation of other coil conductor patterns
Solution Approach 1:
The patent applies local quality by making only the outermost peripheral portion of the coil conductor pattern have a larger line width, while the inner portions maintain a smaller line width. This localized modification reduces conductor loss at the critical outer region where resin flow pressure is highest, without creating irregular resin flow across the entire pattern that would cause positional deviation.
Solution Approach 2:
The coil conductor pattern is segmented into different width regions: an outermost peripheral portion with larger line width and inner portions with smaller line width. This segmentation allows different functional requirements to be met in different regions - the outer region suppresses resin flow and reduces conductor loss, while the inner regions maintain uniformity to prevent positional deviation.
2Loss of energy
If the line width of the coil conductor pattern is increased to reduce conductor loss, then the conductor loss decreases, but the size of the stacked body increases
Solution Approach 1:
Instead of uniformly increasing the line width of the entire coil conductor pattern, the patent applies local quality by increasing the line width only at the outermost peripheral portion. This localized approach reduces conductor loss where it is most critical while avoiding the need to increase the overall size of the stacked body.
Solution Approach 2:
The patent applies partial action by increasing the line width only at the outermost peripheral portion rather than the entire pattern. This partial modification is sufficient to reduce conductor loss and suppress resin flow without the excessive action of increasing the size of the entire stacked body.
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 reduces conductor loss and prevents positional deviation of coil conductor patterns, enhancing the reliability of the resin multilayer substrates by maintaining regular resin flow and reducing the risk of short circuits.
Implementation Method 1
the parallel conductor portion reduces or prevents excessive flow of a resin at the time of hot pressing when forming the stacked body
Data Source
AI summary
A resin multilayer substrate includes a stacked body including resin layers, and a coil including coil conductor patterns provided on two or more resin layers. The coil conductor patterns include a coil conductor pattern including a parallel conductor portion. The parallel conductor portion includes linear conductor patterns connected in parallel that are parallel to each other, and is provided at least at a portion of an outermost peripheral portion of the coil conductor pattern. A total line width of the linear conductor patterns of the parallel conductor portion is larger than a line width of other portions of the coil conductor pattern.