Sensor Assembly Interposer for Noise Reduction
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Solution Overview
Problem
Integrating acoustic components such as microphones and sensors into compact electronic devices poses challenges due to space constraints and the need for efficient noise performance while maintaining reliability and cost-effectiveness.
Innovation Solution
A sensor assembly with an interposer on the sensor circuit board that raises electrical contacts to the cover side, allowing for a larger back chamber and improved noise performance, along with a substrate shelf for flexible circuit attachment, facilitating efficient and reliable connections in compact device housings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If acoustic components are integrated into compact electronic devices, then space utilization is improved, but noise performance deteriorates
Solution Approach 1:
The patent raises electrical contacts from the substrate plane to the cover side using an interposer structure, utilizing the third dimension (vertical space) to resolve the conflict between compact footprint and noise performance. This dimensional transition allows the back chamber to extend closer to the sensor element while maintaining adequate separation from noisy electrical contacts.
Solution Approach 2:
The patent divides the electrical connection function into two separate locations: electrical contacts on the cover side for sensor element connections, and electrical contacts on the substrate side for flex circuit connections. This segmentation isolates different electrical interfaces and their associated noise sources, allowing optimized noise performance for the acoustic sensor while maintaining compact integration.
2Object-affected harmful factors
If electrical contacts are raised to the cover side using an interposer, then noise performance is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the interposer structure: it serves as both a mechanical support for raising electrical contacts and as an electrical connection medium with conductive traces. This merging of structural and electrical functions reduces the need for separate components and simplifies the overall assembly process despite the three-dimensional contact arrangement.
Solution Approach 2:
The interposer structure performs multiple functions simultaneously: it provides mechanical support for elevated electrical contacts, establishes electrical connections between the sensor element and substrate, and enables the back chamber to extend closer to the sensor element for improved noise performance. This multi-functionality reduces the number of separate components needed.
3Volume of moving object
If substrate area is reduced for compact integration, then space utilization is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates alignment features directly into the interposer structure, such as protrusions that fit into recesses or keyed connections. These preliminary alignment mechanisms are built into the interposer during its fabrication, ensuring precise positioning with the substrate and cover before final assembly, thereby reducing the need for high-precision manual alignment during manufacturing.
Data Source
AI summary
Aspects of the subject technology relate to low noise microphone assemblies for electronic devices. A microphone assembly may include components for sensing sound, mounted on a substrate, under a cover disposed on the substrate. The components may receive sound through an opening in the substrate. The microphone assembly may include an interposer on the substrate. The interposer includes one or more contacts on a surface that is spatially separated from the surface of the substrate, in a direction perpendicular to the surface of the substrate. A first side of the substrate may be mounted to an inner surface of a housing of the electronic device. The components, the cover, and the interposer may be mounted to an opposing second side of the substrate. A flexible printed circuit may be coupled to the contacts on the surface of the interposer, and mechanically attached to a surface of the cover.