MLCC Auxiliary Electrodes for Adhesion and Capacitance
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Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) face limitations in product workability and adhesion strength due to external electrodes being only formed on the mounting surface, leading to weak adhesion between the capacitor and the circuit board, which affects capacitance and acoustic noise.
Innovation Solution
The capacitor design includes auxiliary external electrodes formed on the side surfaces of the body, which are electrically connected to the main external electrodes, increasing the capacitance and adhesion strength by providing additional contact areas with the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If external electrodes are only formed on the mounting surface, then the capacitor structure is simple, but the adhesion strength between the capacitor and circuit board is weak
Solution Approach 1:
The patent extends external electrodes from the mounting surface to the side surfaces of the capacitor body, transitioning from a two-dimensional electrode arrangement to a three-dimensional configuration. This dimensional expansion increases the contact area between the capacitor and circuit board, thereby improving adhesion strength without significantly complicating the manufacturing process.
Solution Approach 2:
The external electrodes are divided into multiple segments: electrodes on the mounting surface and additional electrodes on the side surfaces. This segmentation allows each electrode to contribute independently to the overall adhesion, with side surface electrodes providing additional bonding areas that enhance the total adhesion strength.
2Ease of manufacture
If external electrodes are only formed on the mounting surface, then the manufacturing process is simple, but the product workability is limited
Solution Approach 1:
By extending electrodes to side surfaces, the patent enables the capacitor to be mounted and wired from multiple directions, improving product workability and installation flexibility while maintaining compatibility with existing manufacturing processes.
3Quantity of substance
If external electrodes are only formed on the mounting surface, then the capacitor body is exposed, but the capacitance is limited
Solution Approach 1:
The extension of electrodes to side surfaces enables additional internal electrode areas to be utilized for capacitance generation, effectively increasing the capacitive volume without significantly increasing the external dimensions of the capacitor body.
Data Source
AI summary
A capacitor includes a body, first and second external electrodes, and first and second auxiliary external electrodes. The body includes first and second internal electrodes each having first and second lead portions exposed to one surface of the body. The first and second external electrodes are disposed on the one surface of the body and electrically connected to the first and second internal electrodes, respectively. The first and second auxiliary external electrodes are electrically connected to the first and second external electrodes, respectively, and cover portions of surfaces of the body connected to the one surface of the body.