Multilayer Capacitor Electrostrictive Vibration Suppression
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Solution Overview
Problem
Existing electronic components with multilayer capacitors mounted on interposers face challenges in fully suppressing acoustic noise due to electrostrictive vibrations, which propagate from the capacitor to the device, causing unwanted noise.
Innovation Solution
The multilayer capacitor is designed with external electrodes of a specific width configuration that directs electrostrictive vibrations primarily through the external electrodes to the interposer, while maintaining the second portions separated from the interposer, thereby reducing vibration propagation to the electronic device. This configuration stabilizes the posture of the capacitor and prevents direct contact during soldering, ensuring even solder distribution and preventing inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the element body of the multilayer capacitor is in contact with the interposer, then electrical connection is achieved, but electrostrictive vibration propagates directly to the interposer causing acoustic noise
Solution Approach 1:
The element body is divided into three portions: a first portion covered by the external electrode, and second portions on both sides that are exposed and separated from the interposer. This segmentation allows the capacitor to maintain electrical connection through the external electrode while preventing vibration propagation from the exposed portions.
Solution Approach 2:
Different portions of the element body have different functional qualities: the first portion makes electrical contact with the interposer for signal transmission, while the second portions remain separated to minimize vibration transmission. This local differentiation resolves the contradiction between connection and noise suppression.
2Reliability
If the width of external electrodes is increased to improve electrical connection, then connection reliability improves, but vibration propagation to the interposer increases
Solution Approach 1:
The width of the external electrode is optimized to a specific parameter range that balances electrical connection reliability with vibration suppression. This parameter optimization allows the electrode to be sufficiently wide for reliable connection while not being so wide as to transmit excessive vibration to the interposer.
3Object-generated harmful factors
If the second portions are separated from the interposer to reduce vibration, then acoustic noise is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
By segmenting the element body into contact and non-contact portions, the design provides clear manufacturing guidelines: the first portion should contact the interposer while the second portions should remain separated. This segmentation simplifies the manufacturing process by providing distinct functional zones rather than requiring precise control over the entire element body.
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 design effectively reduces the propagation of vibrations from the multilayer capacitor to the electronic device, thereby fully suppressing acoustic noise and ensuring stable mounting and sufficient capacitance.
Implementation Method 1
When a voltage is applied to the multilayer capacitor, an element body thereof is subject to mechanical strain in the magnimde in accordance with the applied voltage due to the electrostrictive effect.
Data Source
AI summary
An electronic component includes a multilayer capacitor and an interposer The multilayer capacitor includes an element body and a pair of external electrodes. The interposer includes a substrate, a pair of first electrodes, and is pair of second electrodes. The substrate includes first and second principal faces. The pair of first electrodes are disposed on the first principal face. The pair of second electrodes are disposed on the second principal thee. The element body includes a first portion and a pair of second portions. The first portion is covered by the external electrodes. The pair of second portions are located on both sides or the first portion and separated from the interposer. A width in a second direction of the pair of external electrodes is smaller than a width in the second direction of the element body and larger than a width in the second direction of the second portion.