MEMS Package Composite Damper for Gap Control
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Solution Overview
Problem
The challenge in microelectromechanical systems (MEMS) packages is the difficulty in precisely controlling the gap between the movable mass and surrounding structures due to large normal deviations in molding material dimensions, which can lead to damage or reduced performance from external impacts and mechanical forces.
Innovation Solution
A MEMS package incorporating a composite damper configured to control the gap between the MEMS structure and the housing structure, utilizing a stack of conductive elements and buffer layers to reduce fluctuation and absorb kinetic energy, thereby managing the gap and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If molding material is used to form the housing structure, then ease of manufacture is improved, but manufacturing precision deteriorates due to large normal deviations in molding material dimensions
Solution Approach 1:
A composite damper is introduced as an intermediary component between the housing structure and the movable mass. This damper absorbs mechanical shocks and compensates for dimensional variations in the molding material, enabling precise gap control despite the inherent imprecision of molded components.
Solution Approach 2:
The composite damper is constructed from multiple materials with different mechanical properties (e.g., elastomeric material combined with conductive elements). This composite structure provides both shock absorption capabilities and precise dimensional control, resolving the contradiction between ease of manufacture and manufacturing precision.
2Device complexity
If the gap between movable mass and housing structure is not precisely controlled, then manufacturing complexity is reduced, but reliability deteriorates due to damage from external impacts
Solution Approach 1:
The composite damper is positioned in advance between the housing structure and the movable mass to provide cushioning against external impacts. This beforehand cushioning protects the movable mass from damage while maintaining a simple manufacturing process, as the damper is integrated into the existing housing structure rather than requiring complex precision adjustments.
3Reliability
If composite damper is added to control gap and absorb shocks, then reliability is improved, but device complexity increases
Solution Approach 1:
The composite damper merges multiple functions into a single component: it controls the gap between the movable mass and housing structure, absorbs kinetic energy from external impacts, and provides mechanical cushioning. By combining these functions rather than implementing them as separate systems, the overall structural complexity is minimized while achieving high reliability.
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
The composite damper significantly reduces gap variation and dampens sudden shocks, enhancing the performance and reliability of the MEMS package by minimizing damage to the movable mass and springs.
Implementation Method 1
utilizing a stack of conductive elements and buffer layers to reduce fluctuation and absorb kinetic energy
Data Source
AI summary
A MEMS package and a method for forming a MEMS package are provided. The MEMS package includes a package substrate, a housing structure, an image sensor structure, a MEMS structure and a composite damper. The housing structure includes a stopper. The image sensor structure and the MEMS structure are between the package substrate and the housing structure. An interconnect wire electrically connects the MEMS structure to the image sensor structure. The composite damper is between the package substrate and the housing structure. The composite damper is configured to control a gap between the interconnect wire and the stopper.