MEMS Z-Offset via Cover Protrusions
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Solution Overview
Problem
Current MEMS processing techniques struggle to easily create z-offsets, as methods like stiction plates are sensitive and costly, and selective thinning is inaccurate and requires additional processing steps.
Innovation Solution
A microelectromechanical system (MEMS) device with a mechanism layer enclosed by covers featuring protruding structures on their inner surfaces, which mechanically deflect parts out of plane, allowing for z-offsets without the need for extra masks or etches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If stiction plates are used to deflect structures in the z-axis, then z-offset capability is achieved, but device complexity and manufacturing cost increase due to additional processing layers and steps
Solution Approach 1:
The patent applies preliminary action by pre-forming the deflecting structure as an integrated part of the cover during the same fabrication process. The cover is patterned and etched to include built-in deflecting features that will automatically deflect the membrane when assembled, eliminating the need for separate stiction plate components and additional processing steps.
Solution Approach 2:
The patent merges the cover structure with the deflecting mechanism into a single integrated component. The cover is designed with integrated deflecting features that combine the sealing function with the z-offset generation function, eliminating the need for separate stiction plates and reducing overall device complexity.
2Manufacturing precision
If selective thinning is used to create z-offsets, then z-axis asymmetry is achieved, but manufacturing complexity increases due to extra masks and additional etches
Solution Approach 1:
The patent applies preliminary action by pre-forming the deflecting structure as an integrated part of the cover during the same fabrication process. The cover is patterned and etched to include built-in deflecting features that will automatically deflect the membrane when assembled, eliminating the need for separate stiction plate components and additional processing steps.
Solution Approach 2:
The patent merges the cover structure with the deflecting mechanism into a single integrated component. The cover is designed with integrated deflecting features that combine the sealing function with the z-offset generation function, eliminating the need for separate stiction plates and reducing overall device complexity.
3Manufacturing precision
If stiction plates are used for z-deflection, then z-offset is achieved, but manufacturing cost increases due to additional processing layers
Solution Approach 1:
The patent applies preliminary action by pre-forming the deflecting structure as an integrated part of the cover during the same fabrication process. The cover is patterned and etched to include built-in deflecting features that will automatically deflect the membrane when assembled, eliminating the need for separate stiction plate components and additional processing steps.
Solution Approach 2:
The patent merges the cover structure with the deflecting mechanism into a single integrated component. The cover is designed with integrated deflecting features that combine the sealing function with the z-offset generation function, eliminating the need for separate stiction plates and reducing overall device complexity.
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
Enables efficient and accurate creation of z-offsets in MEMS devices, reducing costs and complexity compared to existing methods, while maintaining precision and versatility.
Implementation Method 1
the protruding structure mechanically causes the first part to be deflected out of a plane associated with the second part
Data Source
AI summary
A microelectromechanical system (MEMS) device with a mechanism layer having a first part and a second part, and at least one cover for sealing the mechanism layer. The inner surface of at least one of the covers is structured such that a protruding structure is present on the inner surface of the cover and wherein the protruding structure mechanically causes the first part to be deflected out of a plane associated with the second part.