Sound-blocking sheet member and sound-blocking structure using same
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Solution Overview
Problem
Current sound-blocking materials face limitations in design freedom, manufacturing complexity, and economic efficiency due to the use of rigid substrates and adhesive installation methods, which restrict their ability to be easily shaped or installed on non-flat surfaces, and there is a need for a lightweight solution that surpasses the mass-action law for noise reduction.
Innovation Solution
A sound-blocking sheet member with a sheet having rubber elasticity and specific resonance portions, where the weight portion is supported by a base portion and features a penetration portion to facilitate resin filling and even distribution, allowing for improved manufacturability and durability while maintaining high sound-blocking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid substrates and adhesive installation methods are used, then sound-blocking performance is achieved, but design freedom and ease of shaping are restricted
Solution Approach 1:
The patent replaces rigid substrates with a flexible sheet having rubber elasticity, allowing the sound-blocking member to be easily shaped and installed on non-flat surfaces while maintaining sound-blocking performance through resonance portions formed on the flexible sheet
Solution Approach 2:
The patent changes the physical state of the substrate from rigid to flexible by using materials with rubber elasticity, fundamentally altering the mechanical properties to enable both good sound-blocking performance and ease of shaping
2Reliability
If adhesive installation methods are used, then resonance portions can be attached to substrates, but manufacturing complexity and installation difficulty increase
Solution Approach 1:
The patent merges the substrate and resonance portions into a single integrated structure by forming resonance portions directly on the flexible sheet through molding, eliminating the need for separate adhesive installation processes
Solution Approach 2:
The flexible sheet itself serves as the base for forming resonance portions, with the material's rubber elasticity enabling direct formation of the resonance structure without requiring additional adhesive materials or complex assembly steps
3Reliability
If weight portions are provided on resonance portions, then sound-blocking performance is improved, but uneven positioning and exposure issues occur
Solution Approach 1:
The patent incorporates the weight portion into the resonance portion structure during the molding process itself, preliminarily positioning the weight within the resonance portion before the sheet is installed, thereby preventing uneven positioning and exposure issues
Solution Approach 2:
The weight portion is nested within the resonance portion structure, with the weight being embedded in the resonance portion during molding, ensuring proper positioning and preventing exposure
4Reliability
If mass of vibration-damping material is increased, then noise reduction amount is improved, but weight and energy efficiency deteriorate
Solution Approach 1:
The patent uses resonance portions that exploit mechanical vibration and resonance phenomena to achieve sound-blocking effects, allowing lightweight construction by resonating at specific frequencies rather than relying on mass alone
Solution Approach 2:
The patent changes the approach from mass-dependent sound-blocking to resonance-based sound-blocking by adjusting the physical parameters of the resonance portions (size, shape, material properties) to achieve desired frequency response with minimal mass
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 solution provides a lightweight sound-blocking sheet member with enhanced sound-blocking performance beyond the mass-action law, improved manufacturability, and durability, capable of being easily shaped to fit complex surfaces without the issues of uneven weight positioning or exposure.
Implementation Method 1
a sheet having rubber elasticity
Implementation Method 2
resonance portions, wherein the weight portion is supported by the base portion
Data Source
Figure 1
Figure 2A~2B
Figure 3~5
AI summary
An object of the present invention is to provide a sound-blocking sheet member that is relatively lightweight, has high sound-blocking performance overwhelming he law of mass action, and is excellent in terms of manufacturability and durability. The sound-blocking sheet member includes at least a sheet and a plurality of resonance portions. The resonance portion is provided in contact with a sheet surface of the sheet, and the resonance portion includes a weight portion and a base portion. The weight portion is supported by the base portion and has a larger mass than the base portion, and the weight portion has a penetration portion. The base portion is in contact with a surface on a resonance portion front end side of the weight portion and covers the weight portion.