Integrated Loudspeaker Piston and Suspension Fabrication
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Solution Overview
Problem
Conventional loudspeaker fabrication involves numerous discrete parts, making assembly complex and tolerances difficult to achieve, whereas MEMS techniques attempt to form entire transducers on a single substrate, but with limitations in mechanical properties and integration.
Innovation Solution
A process involving a silicon substrate with a compliant material layer and deep reactive ion etching to form a suspended diaphragm and support ring, integrated with a bobbin and ferromagnetic housing, using liquid silicone rubber for suspension with high elastic strain limits and specific mechanical stiffness, simplifying assembly and enhancing mechanical tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional loudspeaker fabrication with numerous discrete parts is used, then assembly flexibility is maintained, but assembly complexity increases and tolerances become difficult to achieve
Solution Approach 1:
The patent merges the suspension and diaphragm into a single integrated component formed from a single substrate. The suspension is created by removing material from portions of the substrate while leaving other portions intact, forming an integrated structure that eliminates the need for separate suspension and diaphragm parts, thereby simplifying assembly while maintaining manufacturing precision.
2Device complexity
If MEMS techniques are used to form entire transducer on single substrate, then assembly complexity is reduced, but mechanical property limitations occur
Solution Approach 1:
The patent employs a composite structure where a silicon substrate (providing mechanical strength and precision) is combined with a compliant material layer (providing suspension flexibility). The compliant material is deposited on the substrate surface, creating a composite system that achieves both high integration and superior mechanical properties, resolving the limitation of using单一 substrate materials.
3Manufacturing precision
If deep reactive ion etching is used to remove substrate material, then manufacturing precision is improved, but process complexity increases
Solution Approach 1:
The etching process is segmented into multiple sequential steps with different objectives: first etching to a controlled depth to form the initial suspension structure, then additional etching to complete the release. This segmentation allows precise control over the suspension thickness and mechanical properties while maintaining manufacturing precision through staged process control.
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 approach integrates the suspension, diaphragm, and part of the housing into a single component with improved mechanical tolerances and high motor constant, simplifying assembly and maintaining efficiency, while allowing for smaller and more precise transducer designs.
Implementation Method 1
a layer of compliant material... suspends the piston in the gap
Implementation Method 2
deep reactive ion etching
Data Source
AI summary
A diaphragm and suspension for an electroacoustic transducer are formed by depositing a layer of compliant material on a first surface of a solid substrate and removing material from a second surface of the solid substrate. The removal leaves a block of substrate material suspended within an inner perimeter of an outer support ring of the substrate material by the compliant material, the block providing the diaphragm.