Multilayer Capacitor Terminal Electrode Gap Arrangement
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Solution Overview
Problem
Conventional multilayer capacitors experience mechanical strain due to electrostrictive effects, which are transmitted to terminal electrodes and subsequently to external substrates, causing vibrations and noise.
Innovation Solution
The configuration of the multilayer capacitor includes terminal electrodes with second electrode portions arranged with gaps in a specific direction to minimize overlap with the capacitor element body, reducing the transmission of mechanical strain. This is achieved by ensuring that the area of overlap (A2) is less than or equal to half of the total area (A1) of the electrode portions, or in more preferred configurations, the electrode portions do not overlap at all, thereby preventing strain transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second electrode portions of the terminal electrodes are disposed on the third face with large overlap area with the element body region, then the electrical connection is improved, but the mechanical strain caused by electrostrictive effect is transmitted to the terminal electrodes and external substrate
Solution Approach 1:
The second electrode portions are divided into multiple segments arranged with gaps in the second direction. This segmentation reduces the continuous overlap area with the element body region, thereby reducing mechanical strain transmission while maintaining electrical connection functionality through the distributed electrode segments
Solution Approach 2:
The electrode configuration is optimized locally by controlling the overlap area ratio (A2/A1 ≤ 0.50) between the second electrode portions and the element body region. This local quality control ensures that electrical connection is maintained while mechanical strain transmission is reduced in the critical overlap regions
2Object-generated harmful factors
If the second electrode portions are arranged with gaps to reduce overlap with the element body region, then the transmission of mechanical strain is reduced, but the electrical connection area is decreased
Solution Approach 1:
The electrode portions are arranged with gaps so that the overlap area A2 is partially reduced to at most 50% of the electrode portion area A1. This partial action is sufficient to reduce mechanical strain transmission while maintaining adequate electrical connection area for functional performance
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 effectively prevents mechanical strain from being transmitted to the terminal electrodes, significantly reducing vibration and noise in external substrates, with measured vibration amplitudes remaining below 10 nm when the A2/A1 ratio is within a specific range, thereby achieving a substantial reduction in noise levels.
Implementation Method 1
when a voltage is applied to the multilayer capacitor having the capacitor element body with the dielectric property, the electrostrictive effect brings about mechanical strain at a level according to the applied voltage in the capacitor element body
Data Source
AI summary
A first terminal electrode has a first electrode portion disposed on a first face and connected to a first internal electrode, and a second electrode portion disposed on a third face and connected to the first electrode portion. A second terminal electrode has a first electrode portion disposed on a second face and connected to a second internal electrode, and a second electrode portion disposed on the third face and connected to the first electrode portion. Each of the second electrode portions of the first and second terminal electrodes, when viewed along a third direction perpendicular to the third face, is arranged with a gap in the second direction so as to sandwich at least a portion of an end in the first direction of an element body region sandwiched between the first internal electrode and the second internal electrode, at an end in the first direction of the second electrode portion.