Three-Terminal Capacitor Terminal Electrode Mounting Structure

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Solution Overview

Problem

The existing three-terminal multilayer ceramic capacitors face challenges with low mounting strength and positional accuracy due to their mountability issues.

Innovation Solution

The electronic component design includes terminal electrodes strategically positioned on the principal and side surfaces, with specific area proportions to enhance mounting strength and accuracy, utilizing a mounting substrate with lands connected by a conductive material to the terminal electrodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If terminal electrodes are extended onto side surfaces and end surfaces, then mounting strength is improved, but device complexity increases

Engineering Contradiction:

Improvemounting strengthVSAvoidterminal electrode structure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The terminal electrodes extend from the principal surface onto the side surfaces and end surfaces of the electronic component body, transitioning from a two-dimensional arrangement to a three-dimensional configuration. This dimensional expansion increases the bonding area between the terminal electrodes and the conductive material on the mounting substrate, thereby enhancing mounting strength without fundamentally changing the electrode material or basic structure.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The terminal electrodes are divided into multiple segments with different area proportions on different surfaces. The first and second terminal electrodes have area proportions between 7-50% on the end surfaces, while the third terminal electrode has area proportions between 15-50% on the side surfaces. This segmentation allows optimization of mounting strength at different locations while managing overall structural complexity.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If terminal electrode area proportions are optimized, then mounting positional accuracy is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvemounting positional accuracyVSAvoidterminal electrode area proportion control

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The invention specifies precise parameter ranges for terminal electrode area proportions: 7-50% on end surfaces and 15-50% on side surfaces. By defining these quantitative parameters, the invention transforms the qualitative goal of improving mounting positional accuracy into controllable manufacturing specifications, allowing for systematic optimization while establishing clear manufacturing tolerances.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9142351B2Electronic component and mounting structure for the electronic component

Publication Date: 2015.09.22 MURATA MFG CO LTD

AI summary

A first terminal electrode extends from a second principal surface onto first and second side surfaces and a first end surface such as not to reach a first principal surface. A second terminal electrode extends from the second principal surface onto the first and second side surfaces and a second end surface such as not to reach the first principal surface. A third terminal electrode extends from the second principal surface onto the first and second side surfaces such as not to reach the first principal surface.