MEMS Flexible Membrane Suction Manipulation
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Solution Overview
Problem
Current micro-electromechanical systems (MEMS) devices have limited capabilities in manipulating microscale objects, particularly in generating forces for precise manipulation and assembly tasks, such as picking up and placing microscale electronics or micro light emitting diodes, due to the lack of effective force generation mechanisms.
Innovation Solution
A MEMS element with a flexible membrane that creates a suction force by flexing, utilizing an electrode configuration to actuate the membrane and generate a clearance region, allowing for the manipulation of microscale objects through controlled voltage application, enabling both attractive and repulsive forces for precise object handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional MEMS structures with multiple electrodes are used, then device complexity increases, but the capability to generate sufficient suction force for manipulating microscale objects remains limited
Solution Approach 1:
The patent extracts the force generation capability from complex multi-electrode structures and concentrates it into a single flexible membrane element. By removing the need for multiple electrodes and associated control circuitry, the design achieves sufficient suction force generation while dramatically reducing device complexity. The flexible membrane alone can generate the required forces through its deformation capability.
Solution Approach 2:
The patent changes the operational parameters of the MEMS device by utilizing large voltage excursions (e.g., 0 to 100V) to drive the flexible membrane between fully actuated and relaxed states. This parameter change enables the membrane to generate sufficient suction force for manipulating microscale objects without requiring complex multi-electrode configurations, thereby improving force generation while maintaining device simplicity.
2Force
If the flexible membrane is allowed to flex freely to generate suction force, then manipulation capability improves, but the membrane may be easily damaged
Solution Approach 1:
The patent implements a foot structure that extends from the flexible membrane to provide mechanical support and protection. This foot acts as a cushioning element that prevents the membrane from making direct contact with manipulated objects or surfaces, thereby preventing damage while allowing the membrane to flex freely to generate the necessary suction force for manipulation.
3Force
If a clearance region is created above the object, then suction force generation is enhanced, but the device structure becomes more complex
Solution Approach 1:
The patent designs the foot structure to serve multiple functions: it protects the flexible membrane from damage, defines the clearance region above the manipulated object, and facilitates suction force generation. By making the foot structure multi-functional, the patent enhances suction force capability without adding separate components, thereby avoiding increased structural 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 precise manipulation and transfer of microscale objects by generating sufficient suction or repulsive forces to pick up, move, and place objects with high precision, suitable for applications in electronics assembly, μLED transfer, and biological/chemical precision tasks.
Implementation Method 1
actuated by applying a potential difference between the membrane and an electrode
Data Source
AI summary
A micro-electro-mechanical systems (MEMS) includes a flexible membrane that creates a suction force by flexing to permit manipulation of a microscale object. The MEMS element includes a casing structure; a flexible membrane attached to the casing structure; and an electrode structure, wherein a voltage applied to the electrode structure causes the flexible membrane to flex relative to the casing structure. The flexible membrane and the casing structure define a gap into which the flexible membrane may flex, and a foot extending from the flexible membrane in a direction away from the casing structure, wherein the foot and the flexible membrane define a clearance region on an opposite side of the flexible membrane from the gap. When the MEMS element interacts with an object to be manipulated the foot spaces the membrane apart from the object, and flexing of the membrane generates the suction force for manipulating the object.