Miniature Transducer Assembly Aid External Alignment Nub
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Solution Overview
Problem
Miniature transducers in noise-canceling headphones face challenges in precise alignment due to the fragility and limited access of internal alignment gauges, which are inadequate for the small component sizes, leading to inconsistent mating conditions and reduced precision in assembly.
Innovation Solution
An external alignment element, or 'nub', extends from the back plate of the transducer structure, allowing for precise alignment using a macro-sized alignment apparatus, eliminating the need for miniaturized gauges and ensuring accurate assembly by transferring precision from micro-sized components to external equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If internal alignment gauges are used for miniature transducer assembly, then alignment function is provided, but precision and reliability deteriorate due to fragility and limited access
Solution Approach 1:
The patent introduces an external alignment gauge as an intermediary tool that couples to the transducer assembly through a coupling feature. This external gauge serves as a mediator between the operator and the miniature components, providing reliable alignment functionality without requiring fragile internal gauges to be miniaturized. The external gauge can be handled and operated with standard precision equipment, thereby resolving the contradiction between needing precise measurement and maintaining reliability.
Solution Approach 2:
The patent moves the alignment gauge from an internal three-dimensional space constraint to an external position, utilizing the additional dimensional space outside the transducer housing. By extending the alignment function to an external gauge that couples through a specific feature, the system gains access to standard-sized alignment tools and equipment, eliminating the need to compromise reliability through miniaturization while maintaining alignment precision.
2Ease of operation
If internal alignment gauges are miniaturized to fit small components, then access to components is enabled, but manufacturing precision and consistency deteriorate
Solution Approach 1:
The external alignment gauge acts as an intermediary that provides consistent manufacturing precision through standard-sized features. The coupling feature on the transducer assembly serves as a standardized interface that ensures consistent mating conditions between the internal components and the external gauge. This intermediary approach allows standard manufacturing tolerances to be applied to the coupling feature, thereby ensuring consistency without requiring the entire alignment gauge to be miniaturized.
Solution Approach 2:
The alignment system is segmented into two parts: a standardized coupling feature on the transducer assembly and a separate external alignment gauge. This segmentation allows the critical precision requirements to be applied only to the small coupling feature on the transducer, while the larger external gauge can be manufactured with standard tolerances. The coupling feature serves as a precision reference that ensures consistent mating conditions, resolving the contradiction between accessibility and manufacturing precision.
3Measurement precision
If standard alignment apparatus is used, then alignment precision is maintained, but applicability to miniature transducers is lost
Solution Approach 1:
The external alignment gauge is designed with universal features that allow it to work with standard alignment apparatus while being adapted to miniature transducers. The coupling feature provides a standardized interface that can accommodate various transducer designs, making the alignment gauge universally applicable. This multi-functionality allows standard alignment equipment to be used across different miniature transducer assemblies, resolving the contradiction between maintaining precision and achieving adaptability.
Solution Approach 2:
The external alignment gauge serves as a universal intermediary that bridges standard alignment apparatus and miniature transducer components. By providing a standardized coupling interface, it enables standard equipment to work with miniature components without requiring customization of the alignment apparatus itself. This intermediary approach maintains alignment precision while achieving broad applicability across different miniature transducer designs.
Data Source
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Figure 3
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AI summary
An electroacoustic transducer comprises a sleeve extending along a longitudinal axis; diaphragm coupled to the sleeve at a first end of the sleeve; a subassembly in the sleeve; and an alignment element extending from the subassembly in a direction substantially away from the diaphragm.