Multilayer Ceramic Structure for Thin Internal Electrode Continuity
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Solution Overview
Problem
Thinning internal electrode layers in ceramic electronic devices, such as multilayer ceramic capacitors, leads to discontinuities and reduced continuity modulus, which affects the electrical performance.
Innovation Solution
A multilayer ceramic electronic device structure is designed with dielectric layers comprising a first layer at the center and second layers adjacent to internal electrode layers, where the second layers have smaller dielectric grain sizes, enhancing the continuity of internal electrode layers while maintaining high dielectric constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If dielectric layers and internal electrode layers are made thinner to achieve smaller device size and larger capacity, then device miniaturization and capacity increase are achieved, but internal electrode layer discontinuities increase and continuity modulus decreases
Solution Approach 1:
The patent applies local quality by creating two distinct regions within the dielectric layer: a first region with larger dielectric grains and a second region with smaller dielectric grains. The second region with smaller grains is specifically positioned adjacent to the internal electrode layers to enhance continuity and reduce discontinuities, while the first region with larger grains occupies the central portion to maintain dielectric performance. This spatial differentiation of grain sizes allows the thin dielectric layer to simultaneously achieve high continuity at the electrode interface and adequate dielectric properties in the bulk.
2Quantity of substance
If internal electrode layers are made thinner to increase capacity, then device capacity increases, but continuity modulus and electrical performance deteriorate
Solution Approach 1:
The patent implements local quality by differentiating the dielectric grain structure into two regions: a first region with larger grains in the central portion and a second region with smaller grains adjacent to the internal electrode layers. This localized control of grain size allows the thin dielectric layer to maintain high continuity modulus at the electrode interface (where smaller grains provide better adhesion and continuity), while preserving adequate dielectric constant and electrical performance in the bulk region (where larger grains contribute to dielectric properties).
Data Source
AI summary
A ceramic electronic device includes a multilayer chip in which each of a plurality of dielectric layers and each of a plurality of internal electrode layers are alternately stacked. At least one of the plurality of dielectric layers comprises a first layer positioned at center thereof in a stacking direction and second layers each of which is adjacent to each of two internal electrode layers adjacent to the at least one of the plurality of dielectric layers and has an average grain size of dielectric grains smaller than that of the first layer.