Thin Film Capacitor Stepped Electrode Protrusion Design
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Solution Overview
Problem
In thin film capacitors, the stability of the electric connection between internal electrode layers and connection electrodes is compromised due to variations in protrusion amounts, leading to unstable capacitance and reduced product yield.
Innovation Solution
The design includes internal electrode layers with protrusion parts that alternately protrude from dielectric body layers, with specific protrusion amount differences to ensure stable contact with connection electrodes, and the use of multiple connection electrodes with different average protrusion differences to distribute stress evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal electrode layers are allowed to protrude from dielectric body layers to ensure connection, then connection stability is improved, but capacitance variation increases due to protrusion amount variations
Solution Approach 1:
The invention changes the geometric parameter of the internal electrode layers by creating a stepped configuration where protrusion amounts differ between adjacent layers. Specifically, the (n-1)th internal electrode layer has a larger protrusion amount than the nth layer, establishing a controlled parameter difference that ensures stable connection while maintaining consistent capacitance across variations.
2Manufacturing precision
If protrusion amounts of internal electrode layers are made uniform, then manufacturing precision is improved, but connection stability deteriorates due to sensitivity to variation
Solution Approach 1:
The invention introduces asymmetry into the previously uniform structure by making the protrusion amounts of adjacent internal electrode layers different. The (n-1)th layer protrudes more than the nth layer, creating an asymmetric stepped pattern that inherently compensates for manufacturing variations and improves connection stability.
3Productivity
If connection electrodes are designed to contact multiple internal electrode layers, then productivity is improved, but stress concentration increases leading to cracks
Solution Approach 1:
The invention segments the contact interface between connection electrodes and internal electrode layers by creating distinct contact zones. Each connection electrode contacts specific internal electrode layers at different positions, dividing the stress distribution across multiple separated contact points rather than concentrating stress at a single interface.
Data Source
AI summary
A thin film capacitor includes an under electrode, a plurality of dielectric body layers and a plurality of internal electrode layers that are alternately laminated on the under electrode, the internal electrode layers respectively including protrusion parts that each protrude from the dielectric body layers viewed in the lamination direction, and connection electrodes to which at least a portion of each of the protrusion parts contacts. Assuming that protrusion amounts of the protrusion parts of the internal electrode layers that are connected to the same connection electrode are regarded as L, a protrusion amount Ln of a protrusion part of nth (n≧2) internal electrode layer from the under electrode side is smaller than another protrusion amount Ln-1 of another protrusion part of (n−1)th internal electrode layer.