Multilayer Substrate Bend Structure for Signal Isolation Stability
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Solution Overview
Problem
Flexible substrates with bent portions suffer from mechanical deformation and fatigue breakage due to parallel bending lines, leading to potential wiring failure.
Innovation Solution
A flexible multilayer substrate with a protrusion in the bent portion to enhance mechanical rigidity and electrical characteristics, featuring a multilayer body with a protrusion protruding towards the bend, and conductor layers positioned to avoid the protrusion, along with additional conductor layers within the protrusion to increase rigidity and electrical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bent sheet portion is provided in a bent portion with parallel bending lines, then isolation between different signals is improved, but the bent portion mechanically deforms easily and fatigue breakage of wiring may occur
Solution Approach 1:
The patent applies local quality by introducing a protrusion at a specific location within the bent portion, creating a non-uniform structure that locally increases mechanical rigidity without affecting the overall signal isolation properties. The protrusion is strategically positioned to reinforce the bent portion where mechanical strength is needed while maintaining the parallel bending line configuration that provides signal isolation.
2Reliability
If the bending line of the bent portion and the bending line of the bent sheet portion are parallel, then isolation between different signals is improved, but the bent portion mechanically deforms easily
Solution Approach 1:
The protrusion introduces local structural variation that enhances mechanical stability without disrupting the parallel bending line geometry. This localized reinforcement allows the bent portion to maintain its shape and resist deformation while preserving the signal isolation benefits of the parallel bending configuration.
Solution Approach 2:
The patent creates a composite structure by combining the existing bent sheet portion material with an additional protrusion element. This composite construction integrates the signal isolation properties of the parallel bending lines with the mechanical stability provided by the protrusion, achieving both electrical and mechanical performance requirements.
3Reliability
If conductor layers are positioned to avoid the protrusion, then electrical characteristics are improved, but the rigidity of the bent portion may be reduced
Solution Approach 1:
The patent resolves this contradiction by positioning conductor layers to avoid the protrusion, maintaining optimal electrical characteristics, while the protrusion itself provides the necessary mechanical rigidity. The protrusion acts as a structural reinforcement that compensates for any potential rigidity reduction from conductor layer positioning, ensuring both electrical and mechanical performance.
Data Source
AI summary
A multilayer substrate includes a multilayer body including an insulator layer and a conductor layer that are stacked. The multilayer body includes a bent portion and a bent-portion continuation portion continuous with the bent portion. The multilayer body includes, in a portion of the bent portion, a protrusion protruding toward an inside of a bend of the bent portion.