Multilayer Ceramic Capacitor Electrode Geometry for Mounting Stability
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Solution Overview
Problem
Multilayer ceramic electronic components face challenges in reducing inclination during mounting on circuit boards due to stress from solder wetting and solidification, leading to reduced fixing strength and aesthetic issues.
Innovation Solution
The design of multilayer ceramic components with specific outer electrode configurations, where the lengths of the outer electrode side surface portions are greater than the outer electrode end surface portions, ensuring a larger down force is applied at four positions of the side surfaces, thereby reducing inclination by determining the mounting orientation based on the electrode height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If outer electrodes are located only on the mounting surface with inner electrodes extending to the outer electrodes, then the space for mounting is reduced, but the component becomes inclined during mounting due to solder stress
Solution Approach 1:
The outer electrode is segmented into multiple portions: a first outer electrode portion on the mounting surface, and second outer electrode portions extending to the side surfaces. This segmentation allows different parts of the electrode to serve different functions - the first portion provides mounting surface contact while the second portions provide lateral stability against inclination during soldering.
2Force
If the outer electrode extends to the side surfaces, then the down force is increased to prevent inclination, but the electrode structure becomes more complex
Solution Approach 1:
The outer electrode structure merges the mounting function and the anti-inclination function into a single integrated electrode system. The first outer electrode portion on the mounting surface and the second outer electrode portions on the side surfaces work together as one continuous conductive structure, eliminating the need for separate anti-inclination mechanisms.
3Strength
If the component is designed to prevent inclination through electrode configuration, then the fixing strength is improved, but the manufacturing process becomes more difficult
Solution Approach 1:
The outer electrode serves multiple functions simultaneously: it provides electrical connection to the inner electrodes, forms the mounting surface contact area, extends to side surfaces to prevent inclination during soldering, and creates the necessary down force distribution. This multi-functionality eliminates the need for separate structures for each function, simplifying the overall manufacturing process.
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
This configuration significantly reduces or prevents the inclination of multilayer ceramic components during mounting, enhancing fixing strength and appearance by effectively controlling the mounting orientation through the applied down force.
Implementation Method 1
the lengths of the first outer electrode side surface portions and the second outer electrode side surface portions in a direction in which the first main surface and the second main surface are connected are longer than the lengths of the first outer electrode end surface portion and the second outer electrode end surface portion in the direction in which the first main surface and the second main surface are connected, about 1.40≤A/B≤about 3.33 is satisfied. Therefore, when mounting onto a circuit board is performed, the inclination of a multilayer ceramic electronic component is able to be significantly reduced or prevented because the mounting orientation is determined by a down force, which is applied during melting of a joining material during mounting, exerted on the multilayer ceramic capacitor
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including ceramic layers and including main surfaces, side surfaces, and end surfaces, inner electrodes, which are located inside the multilayer body and a portion of each of which extends to one main surface, and outer electrodes located on one main surface and connected to the inner electrodes. Each of the outer electrodes includes outer electrode side surface portions located up to a portion of each of the side surfaces and an outer electrode end surface portion located up to one end surface, and about 1.40≤A/B≤about 3.33 is satisfied, where the lengths of the outer electrode side surface portions in the direction in which the main surfaces are connected are indicated as A and the lengths of the outer electrode end surface portions in the direction in which the main surfaces are connected are indicated as B.