Multilayer Substrate Actuator Rigidity via Segmented Layering
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Solution Overview
Problem
Multilayer substrates with actuator function portions experience characteristic changes and deformation when the flexible region is bent, due to transmitted bending stress, affecting the coil and actuator performance.
Innovation Solution
A multilayer substrate configuration with a higher number of stacked layers in the first region compared to the second region, combined with a reinforcement film and a dummy conductor, increases the rigidity of the actuator function portion, reducing deformation and characteristic changes when the flexible region is bent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the second region is made flexible by reducing the number of stacked layers, then the ease of connection is improved, but the actuator function portion deforms due to transmitted bending stress
Solution Approach 1:
The substrate is divided into a first region with a first number of insulating base material layers and a second region with a second number of insulating base material layers, where the first number is greater than the second number. This segmentation allows the second region to be more flexible for easy connection while the first region maintains structural stability to prevent actuator deformation.
Solution Approach 2:
Different regions of the substrate are given different structural properties: the first region has more insulating base material layers for rigidity and stability, while the second region has fewer layers for flexibility and ease of connection. This local differentiation resolves the contradiction between connection ease and actuator stability.
2Stability of the object's composition
If the number of stacked layers in the first region is increased to prevent deformation, then the actuator function portion stability is improved, but the device complexity increases
Solution Approach 1:
Instead of uniformly increasing the number of layers throughout the entire substrate, the patent segments the substrate into regions with different layer counts. Only the first region containing the actuator function portion has more layers, while the second region maintains fewer layers, thus achieving stability where needed without unnecessarily increasing overall device complexity.
3Strength
If the thickness of the first insulating base material layer is reduced to increase conductor ratio, then the actuator function portion rigidity is improved, but the insulation performance may be compromised
Solution Approach 1:
The patent optimizes the thickness parameter of the first insulating base material layer to achieve the desired balance. By carefully controlling the thickness to be smaller than specific reference values, the conductor ratio and rigidity are improved while maintaining sufficient insulation performance through the combined structure of multiple layers.
Data Source
AI summary
A multilayer substrate includes a stacked body including first and second flexible insulating base material layers, and an actuator conductor pattern on at least the first insulating base material layer. The stacked body includes a first region including stacked first and second insulating base material layers, and a second region including stacked second insulating base material layers. The first region includes an actuator function portion in a portion thereof, the actuator function portion including the actuator conductor pattern. The thickness of the first insulating base material layer including the actuator conductor pattern is smaller than the thickness of one second insulating base material layer.