Multilayer ceramic capacitor
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Solution Overview
Problem
Conventional low-capacitance multilayer ceramic capacitors are susceptible to manufacturing errors, making it difficult to set the desired capacitance accurately.
Innovation Solution
A multilayer ceramic capacitor design with internal electrode layers that are not connected to external electrodes, allowing for easy adjustment of capacitance by varying the number of internal electrode layers and their arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If one internal electrode is provided inside a dielectric and is not connected to external electrodes, then the capacitance is reduced, but the manufacturing precision deteriorates due to susceptibility to manufacturing errors
Solution Approach 1:
The internal electrode layer is divided into multiple segments (first internal electrode layer and second internal electrode layer) that are not connected to external electrodes, while the external electrode layers remain connected to external electrodes. This segmentation allows precise control of capacitance by adjusting the number, area, and arrangement of internal electrode segments without compromising manufacturing precision.
Solution Approach 2:
Different regions of the capacitor have different electrode configurations: external electrode layers are connected to external electrodes for stable electrical connection, while internal electrode layers are divided into disconnected segments for capacitance control. This local differentiation enables simultaneous achievement of low capacitance and high manufacturing precision.
2Manufacturing precision
If multiple internal electrode layers are used with disconnected configurations, then the capacitance can be precisely controlled, but the device complexity increases
Solution Approach 1:
The internal electrode layer is segmented into multiple independent layers (first and second internal electrode layers) with different areas and positions. This segmentation enables precise capacitance control by selectively connecting or disconnecting specific segments, while the modular structure actually simplifies manufacturing compared to complex interconnections.
Solution Approach 2:
The patent controls capacitance not by changing the connectivity in the electrical dimension, but by varying the physical dimension (area) of internal electrode layers in the geometric dimension. This dimensional approach simplifies the structure by using area variation rather than complex connection patterns.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise setting of capacitance and reduces equivalent series resistance (ESR) while maintaining low capacitance, with minimal capacitance variation with temperature changes.
Implementation Method 1
a dielectric layer and an internal electrode layer that are alternately laminated
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including dielectric layers and internal electrode layers, which are alternately stacked, and two main surfaces on opposite sides from each other in a stacking direction, two end surfaces on opposite sides from each other in a length direction orthogonal to the stacking direction, and two side surfaces on opposite sides from each other in a width direction orthogonal to both the stacking and length directions, and first and second external electrodes. A distance between the side surfaces is shorter than a distance between the end surfaces. The first and second external electrodes are located on the first end surface and the second end surface, or the first side surface and the second side surface, respectively. At least one or all of the internal electrode layers are not connected to either of the first external electrode or the second external electrode.