Multilayer Capacitor Insulating Layer for Acoustic Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer capacitors generate acoustic noise due to vibrations, which can affect the performance of electronic devices and degrade sensor sensitivity, leading to user misinterpretation and reduced acoustic input/output quality.
Innovation Solution
A multilayer capacitor design incorporating a noise reduction insulating layer covering the body and external electrodes, with specific dimensional ratios and materials to minimize acoustic noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a dielectric material with high dielectric constant is used to achieve high capacitance, then the capacitance increases, but acoustic noise is generated due to piezoelectric vibrations
Solution Approach 1:
A noise reduction insulating layer is introduced as an intermediary between the piezoelectric multilayer capacitor and the substrate. This mediator absorbs vibrational energy and prevents the transmission of acoustic noise to the substrate, while allowing the capacitor to maintain its high capacitance function.
Solution Approach 2:
The piezoelectric vibrations that generate harmful acoustic noise are converted into beneficial stress absorption by the noise reduction insulating layer. The layer is designed to absorb these vibrations, transforming the harmful mechanical energy into harmless dissipation, thereby reducing noise transmission to the substrate.
2Object-generated harmful factors
If the noise reduction insulating layer covers a larger area to reduce acoustic noise, then noise reduction improves, but the placement stability of external electrodes may deteriorate
Solution Approach 1:
The noise reduction insulating layer is designed with spatially varying properties: it has a first region covering the body and a second region covering the external electrodes. The thickness and material composition are optimized differently in each region to simultaneously achieve noise reduction and maintain electrode placement stability.
Solution Approach 2:
The thickness of the noise reduction insulating layer is precisely controlled within specific ranges (first thickness for the body region, second thickness for the electrode region). By adjusting these thickness parameters, the design optimizes both noise absorption and mechanical stability of the external electrodes on the substrate.
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
The design effectively reduces acoustic noise and prevents defects such as pinholes, enhancing device performance and reliability.
Implementation Method 1
The design effectively reduces acoustic noise and prevents pinhole defects, enhancing the reliability and performance of the multilayer capacitor by absorbing stress
Implementation Method 2
A dielectric material having a high dielectric constant used in a multilayer capacitor may also have piezoelectric properties, such that the multilayer capacitor may vibrate minutely due to an applied voltage
Data Source
AI summary
A multilayer capacitor includes a body including a laminate structure in which at least one first internal electrode and at least one second internal electrode are alternately laminated in a first direction with at least one dielectric layer interposed therebetween; first and second external electrodes spaced apart from each other and disposed on the body to be connected to the at least one first internal electrode and the at least one second internal electrode, respectively; and a noise reduction insulating layer covering one surface of the body and one surfaces of the first and second external electrodes together.