Composite Grille Outer Shell for Audio Playback Devices
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Solution Overview
Problem
Conventional methods for manufacturing hard grilles for audio playback devices are costly and time-consuming due to the multi-step process involving CNC drilling, inspection, and assembly, which can be labor-intensive and expensive.
Innovation Solution
The use of a thin, flexible sheet comprising a rigid underlying thermoplastic material and an overlying elastomeric material, which can be punched instead of drilled, reducing manufacturing complexity and cost, while maintaining structural integrity and Wi-Fi performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional CNC drilling methods are used to manufacture hard grilles, then manufacturing precision and structural integrity are maintained, but manufacturing cost and time consumption increase significantly
Solution Approach 1:
The patent changes the manufacturing method from CNC drilling to punching, and modifies the material parameters by using a composite structure of thermoplastic and elastomeric materials. This allows the grille to be manufactured more efficiently through punching while maintaining structural integrity through the composite material design.
Solution Approach 2:
The patent employs a composite material structure consisting of a thermoplastic material layer and an elastomeric material layer. The thermoplastic layer provides structural rigidity for precise punching, while the elastomeric layer offers flexibility and aesthetic quality, resolving the contradiction between manufacturing efficiency and structural integrity.
2Reliability
If multi-step manufacturing processes including inspection and assembly are used, then product quality is ensured, but labor intensity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple manufacturing steps into a more integrated process. The punching operation simultaneously creates the grille pattern and separates the grille from the sheet, reducing the number of discrete steps. The composite material structure also integrates structural and aesthetic functions into a single component.
Solution Approach 2:
The patent extracts the grille from the surrounding material through the punching process, automatically separating the finished grille component from the excess sheet material. This eliminates the need for separate cutting or trimming operations.
3Ease of manufacture
If thin flexible sheets are used instead of traditional hard grilles, then manufacturing cost and labor are reduced, but structural integrity may be compromised
Solution Approach 1:
The patent uses a composite material system where the thermoplastic layer provides the necessary structural strength and rigidity, while the elastomeric layer provides flexibility and aesthetic properties. This composite structure enables easy manufacturing through punching while maintaining adequate structural integrity for the application.
Solution Approach 2:
The patent applies different material properties to different layers of the grille structure. The thermoplastic layer is positioned to provide structural support where needed, while the elastomeric layer provides flexibility and visual appeal. This local differentiation of material qualities allows the thin sheet structure to achieve both ease of manufacture and sufficient strength.
Data Source
AI summary
A playback device including a housing having a first end portion, a second end portion and an intermediate portion therebetween. The playback device can further include an audio transducer at least partially disposed in the intermediate portion and a grille assembly surrounding the intermediate portion between the first and second end portions. The grille assembly can include a substrate and an outer shell surrounding the substrate. The outer shell can include an elastomeric material bonded onto a thermoplastic material, wherein the outer shell includes a perforated portion extending between the first and second end portions of the housing and overlaying the audio transducer, and wherein the perforated face defines a plurality of apertures extending through the elastomeric and thermoplastic materials.