Multilayer Capacitor Bottleneck Electrode Structure

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Solution Overview

Problem

There is a challenge in increasing the capacitance of small-sized multilayer ceramic capacitors due to limitations in the number of laminated internal electrodes, which restricts the achievement of an intended level of capacitance as component sizes decrease.

Innovation Solution

The design incorporates a bottleneck structure for internal electrodes, with a shape recessed into the body, allowing for increased length and overlapping area, and a multilayer structure with external electrodes that cover recessed portions, enhancing the effective area of internal electrodes and thereby increasing capacitance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the component size is reduced, then the miniaturization requirement is met, but the number of laminated internal electrodes is limited and capacitance cannot reach the intended level

Engineering Contradiction:

Improvecomponent sizeVSAvoidcapacitance

Core Design Contradiction:

Volume of moving objectVSQuantity of substance

Solution Approach 1:

The internal electrode extends beyond the front and rear surfaces of the capacitor body in the width direction, utilizing the lateral dimension to increase effective area. This dimensional extension allows the electrode to overlap with external electrodes on the side surfaces, thereby increasing capacitance without increasing the stacking direction thickness or overall component volume.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Quantity of substance

If the number of laminated internal electrodes is increased, then capacitance can be increased, but the component size increases

Engineering Contradiction:

ImprovecapacitanceVSAvoidcomponent size

Core Design Contradiction:

Quantity of substanceVSVolume of moving object

Solution Approach 1:

The electrode structure is segmented into internal electrodes stacked in the thickness direction and external electrodes on the side surfaces. The internal electrodes extend laterally to overlap with external electrodes, creating multiple capacitance-forming regions distributed throughout the component volume, thereby increasing total capacitance without proportionally increasing component size.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The internal electrodes are nested within the dielectric layers forming the main body, while simultaneously extending outward to overlap with external electrodes. This nested configuration allows the electrode structure to utilize both the internal stacked arrangement and external lateral overlap, maximizing capacitance within a compact form factor.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS11705277B2Multilayer capacitor

Publication Date: 2023.07.18 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A multilayer capacitor includes a body including dielectric layers and internal electrodes, and external electrodes, wherein the body has first and second surfaces opposing each other in a first direction, third and fourth surfaces opposing each other in a second direction, and fifth and sixth surfaces opposing each other in a third direction perpendicular to the first and second directions. A length of a portion of the plurality of internal electrodes in the third direction in an intermediate region of the body in the first direction is greater than a length of the first surface or the second surface of the body in the third direction. The plurality of internal electrodes have a bottleneck structure between the intermediate region and at least one of the first and second surfaces, and wherein the bottleneck structure has a shape recessed into an inner portion of the body.