Multilayer Capacitor Conductive Layer Bending for Moisture Resistance
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Solution Overview
Problem
Conventional multilayer capacitors face challenges in achieving high moisture resistance and preventing layer separation, especially when reduced in size to accommodate smaller electronic devices, due to increased internal stress and susceptibility to moisture at the corners of the capacitor.
Innovation Solution
A method involving the formation of a multilayer capacitor with conductive and dielectric layers arranged alternately, where the conductive layers are stretched and bent to create convex shapes, and outer electrodes are connected to specific arrangements of these layers, incorporating materials like barium titanate and silicon to enhance moisture resistance and adhesion between dielectric layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the multilayer capacitor is reduced in size and capacitance is increased by increasing the number of conductive layers, then the capacitance increases, but the moisture resistance decreases due to conductive layers near corners becoming susceptible to moisture
Solution Approach 1:
The patent applies local quality by creating two different arrangements of conductive layers: a first arrangement where conductive layers are positioned away from corner regions to prevent moisture ingress, and a second arrangement that maximizes capacitance. This spatial differentiation allows the capacitor to achieve high capacitance while protecting corner regions from moisture damage.
2Quantity of substance
If the number of conductive layers is increased to increase capacitance, then the capacitance increases, but internal stress increases causing layer separation
Solution Approach 1:
The patent differentiates between first and second arrangements of conductive layers, where the first arrangement is optimized for mechanical stability and reduced internal stress, while the second arrangement maximizes capacitance. This local differentiation allows the structure to accommodate high numbers of conductive layers without excessive internal stress.
3Volume of moving object
If the multilayer capacitor is reduced in size, then the device size decreases, but the distance from conductive layers to surface becomes small increasing moisture susceptibility
Solution Approach 1:
The patent creates a first arrangement of conductive layers that positions them away from corner regions and surfaces, providing enhanced protection against moisture ingress. This local structural differentiation allows small-sized capacitors to maintain moisture resistance by protecting vulnerable regions while still achieving high capacitance through the second arrangement.
Data Source
AI summary
A multilayer capacitor includes a multilayer body with sides each about 0.3 mm or smaller when viewed from a stacking direction of the multilayer body, and first and second outer electrodes disposed on a surface of the multilayer body. An outermost one of the conductive layers is bent to be convex in the stacking direction and includes penetrating portions extending in the stacking direction. In a cross section perpendicular or substantially perpendicular to a lengthwise direction of the multilayer body, assuming the bent conductive layer is equally divided into four regions named region A, region B, region C, and region D arranged in the order named in a widthwise direction of the multilayer body, a sum of minimum diameters of the penetrating portions is larger in the region A than in the region B and larger in the region D than in the region C.