MEMS Pressure Transducer Package With Tolerant Rigid Transfer Block
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Solution Overview
Problem
MEMS pressure transducers, such as microphones and speakers, face challenges in assembly due to limited space in consumer electronics, requiring precise placement with rigid connections that are prone to failure from assembly tolerances, especially when fluid and electrical ports are on opposite sides of the package.
Innovation Solution
A pressure transducer package with a rigid transfer block that includes an assembly tolerance portion, allowing for misalignment during assembly, using a rigid connector that provides a mechanical and electrical connection between the MEMS device and the package pad, even when the package is closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid connectors are used to ensure stable electrical connection, then electrical connection stability is improved, but assembly precision requirements increase leading to potential breakages and misalignments
Solution Approach 1:
The patent changes the physical state of the connector from rigid to flexible, allowing the connector to deform and accommodate assembly misalignments while maintaining electrical connection stability. This parameter change resolves the contradiction by enabling tolerance in assembly precision without sacrificing connection reliability.
Solution Approach 2:
The patent employs flexible connectors that can bend and deform to accommodate misalignments between components. These flexible connectors maintain electrical continuity despite positional deviations, resolving the contradiction between connection stability and assembly precision requirements.
2Manufacturing precision
If flexible connectors are used to accommodate assembly misalignments, then assembly tolerance is improved, but accessibility during assembly is worsened as they become inaccessible after package closure
Solution Approach 1:
The patent segments the connection system into multiple components including flexible connectors and corresponding contact elements, allowing the flexible portion to remain accessible during assembly while the rigid package structure is formed. This segmentation enables assembly tolerance accommodation without permanently sacrificing accessibility.
Solution Approach 2:
The patent performs preliminary assembly actions where flexible connectors are positioned and connected before the package is fully closed. This timing ensures that the flexible connectors remain accessible during the critical assembly phase, allowing misalignment compensation while maintaining later accessibility for testing or maintenance.
3Manufacturing precision
If precise placement is enforced to ensure proper fit, then component positioning accuracy is improved, but assembly complexity and risk of breakage increase
Solution Approach 1:
The patent introduces dynamic flexibility into the connector system, allowing the flexible connectors to adapt their shape and position dynamically during assembly. This dynamic capability reduces assembly complexity by eliminating the need for rigid precise placement while maintaining functional accuracy.
Solution Approach 2:
The patent incorporates flexible connectors that act as cushioning elements, absorbing the effects of assembly misalignments and reducing the risk of breakage. This beforehand cushioning allows for less precise placement without compromising component integrity or assembly success.
Data Source
AI summary
A pressure transducer package comprising a substrate and a lid is attached to the substrate, where a cavity is defined underneath the lid. A MEMS pressure transducer is arranged inside the cavity, the MEMS pressure transducer covering a fluid port. A package pad is provided at a first side of the package, while the fluid port is provided at an opposite second side of the package. A transfer block is configured to provide an electric path between the MEMS pressure transducer and the oppositely arranged package pad, where at least one of the lid and the rigid transfer block comprises an assembly tolerance portion for providing a mechanical assembly tolerance between the rigid transfer block and at least one of the substrate and the lid.