Multilayer Ceramic Capacitor Electrode Connection Stability
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Solution Overview
Problem
Existing multilayer ceramic capacitors face instability in connections between internal electrode layers and external electrodes when size reduction and capacitance increase are demanded, due to the small dimensions of lead parts which can lead to unreliable connections.
Innovation Solution
The multilayer ceramic capacitor design includes a capacitive element with alternating first and second internal electrode layers, covered by conductor and cover layers, where the ends of these layers are connected to external electrodes over equivalent widths, ensuring stable connections even with reduced dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the length-direction dimension of internal electrode layers is decreased to meet size reduction demand, then the overall capacitor size is reduced, but the connection between lead parts and external electrodes becomes unstable
Solution Approach 1:
The patent extends the conductor layers in the width direction beyond the boundaries of the internal electrode layers, creating an L-shaped configuration. This dimensional extension in the width direction compensates for the reduced length-direction dimension, maintaining adequate connection area between lead parts and external electrodes while achieving overall size reduction.
Solution Approach 2:
The capacitor structure is divided into distinct functional zones: the internal electrode layers for capacitance, the extended conductor layers for stable connection, and the cover layers for protection. This segmentation allows the conductor layers to be optimized independently for connection stability while the internal electrode layers are optimized for capacitance density.
2Length of stationary object
If the height-direction dimension of internal electrode layers is decreased to meet size reduction demand, then the overall capacitor height is reduced, but the connection area between lead parts and external electrodes becomes extremely small
Solution Approach 1:
When the height-direction dimension is reduced, the patent compensates by extending the conductor layers in the width direction. This creates an L-shaped conductor layer configuration where the extension in width direction maintains adequate connection area despite the reduced height, preventing connection instability.
Solution Approach 2:
The conductor layers are designed with non-uniform distribution: they extend beyond the internal electrode layer boundaries in the width direction where connection stability is needed, while maintaining compact dimensions in other areas. This local quality variation ensures stable connections without compromising overall size reduction.
3Quantity of substance
If the length-direction dimension of internal electrode layers is decreased to increase capacitance density, then capacitance per unit volume increases, but the lead part dimensions become extremely small leading to unstable connections
Solution Approach 1:
The conductor layers extend in the width direction beyond the reduced-length internal electrode layers, creating an L-shaped configuration. This extension in width direction maintains adequate connection area and lead part dimensions for stable connections, while the internal electrode layers achieve high capacitance density through reduced length-direction dimensions.
Solution Approach 2:
The structure separates the capacitance-generating function (internal electrode layers with reduced dimensions) from the connection function (extended conductor layers). This segmentation allows the internal electrode layers to be optimized for capacitance density while the conductor layers maintain adequate dimensions for reliable connections.
Data Source
AI summary
In an embodiment, one length-direction end of each first internal electrode layer 111a is connected to the first conductor layer 112 of the capacitor body 110 over a connection width equivalent to the width of each first internal electrode layer 111a, while the other length-direction end of each second internal electrode layer 111b is connected to the second conductor layer 113 over a connection width equivalent to the width of each second internal electrode layer 111b. One height-direction end of the first conductor layer 112 is connected to the first external electrode 120 over a connection width equivalent to the width of the first conductor layer 112, while one height-direction end of the second conductor layer 113 is connected to the second external electrode 130 over a connection width equivalent to the width of the second conductor layer 113.