Thin-Film Capacitor Cover Layer Adhesion via Curved Inclined Surfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Thin-film capacitors face issues with the separation of the cover layer from the stacked body due to inadequate adhesion, leading to potential breakage.
Innovation Solution
A thin-film capacitor design featuring a stacked body with an opening portion having a lower electrode layer as the bottom surface and inclined surfaces formed by dielectric and electrode layers, where a curved surface with a predetermined shape is created on the inclined surfaces to enhance the adhesiveness of the cover layer, preventing separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cover layer is formed to protect the dielectric layers and electrode layers, then the protection function is improved, but separation of the cover layer from the stacked body occurs due to insufficient adhesion
Solution Approach 1:
The patent applies curvature to the inclined surface of the opening portion by forming a curved surface with a predetermined shape (concave or convex) on the inclined surface. This curved surface increases the adhesion between the cover layer and the stacked body, preventing separation while maintaining the protection function. The curvature creates mechanical interlocking that enhances bonding strength.
2Device complexity
If an inclined surface is formed by the dielectric layer and electrode layer, then the structure is simplified, but the adhesion to the cover layer is insufficient
Solution Approach 1:
The patent modifies the inclined surface by forming a curved surface with a predetermined shape (concave or convex) on it. This maintains the overall simplified inclined structure while adding local curvature to enhance adhesion. The curved surface is formed on the inclined surface created by the dielectric layer and electrode layer, combining structural simplicity with improved bonding.
Solution Approach 2:
The patent applies local quality by forming a curved surface with a predetermined shape at specific locations on the inclined surface. The curvature is not applied uniformly but rather as a localized feature on the inclined surface, enhancing adhesion where needed while maintaining the overall simplified inclined structure. This allows the structure to remain simple while achieving improved bonding at critical interfaces.
Data Source
AI summary
A thin-film capacitor including a stacked body having a lower electrode layer, a plurality of dielectric layers stacked on the lower electrode layer, one or more internal electrode layers interposed between the dielectric layers, and an upper electrode layer that is stacked on the opposite side of the lower electrode layer with the dielectric layers and the internal electrode layers interposed between, and a cover layer that covers the stacked body. The stacked body includes opening portions that have the lower electrode layer, opens upward in a stacking direction, and has a side surface formed to include an inclined surface. The cover layer is stacked on the inclined surface of the stacked body. A curved surface with a predetermined shape is formed on the inclined surface for each pair of layers including the dielectric layer forming the inclined surface and the electrode layer, forming the inclined surface.