MEMS Lamination via Alignment Posts

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Solution Overview

Problem

Existing methods for fabricating micro electro-mechanical systems (MEMS) structures are overly complex, time-consuming, and costly.

Innovation Solution

A method involving the alignment of layers through positioning alignment posts through corresponding alignment openings, followed by lamination, specifically for MEMS structures that include an electromechanical layer with a piezoelectric layer and a micromechanical structure with a structural layer and spacing layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional MEMS fabrication methods are used, then manufacturing precision can be maintained, but the process complexity and time consumption increase significantly

Engineering Contradiction:

Improvealignment precisionVSAvoidfabrication process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The fabrication process is segmented into distinct lamination stages, with each layer being aligned and bonded separately using alignment posts. This divides the complex multi-layer fabrication into manageable sequential steps, reducing overall process complexity while maintaining precision through repeated alignment operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Alignment posts serve as intermediary elements that facilitate precise alignment between layers. These posts are positioned through corresponding alignment openings and enable accurate registration without requiring complex alignment machinery, thus simplifying the fabrication process while maintaining manufacturing precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If traditional MEMS fabrication methods are used, then manufacturing precision can be maintained, but production time increases

Engineering Contradiction:

Improvealignment precisionVSAvoidfabrication time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

Alignment openings are pre-formed in each layer before lamination, and alignment posts are positioned in advance. This preliminary preparation enables rapid alignment during lamination without time-consuming adjustments, maintaining precision while reducing fabrication time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The alignment and lamination operations are merged into a single integrated step. Alignment posts are positioned through alignment openings and the layers are bonded simultaneously, eliminating separate alignment and bonding steps, thus reducing time while maintaining precision.

Inventive Principle:

Principle #5Merging (Combining)

3Strength

If traditional MEMS fabrication methods are used, then structural integrity can be ensured, but fabrication cost increases

Engineering Contradiction:

Improvestructural integrityVSAvoidfabrication cost

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

Alignment posts are simple, inexpensive components that can be easily replaced if needed. Their low cost allows for optimized designs that ensure structural integrity without requiring expensive, highly durable alignment features, thus reducing fabrication cost while maintaining strength.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The lamination structure serves multiple functions: it provides structural integrity through strong bonding, enables precise alignment through alignment posts, and facilitates assembly of complex multi-layer MEMS devices. This multi-functionality reduces the need for additional specialized components, lowering fabrication costs while ensuring structural strength.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This method simplifies the fabrication process, reduces time and costs, while maintaining the performance of MEMS structures, particularly membrane-based piezoelectric devices.

Implementation Method 1

an electromechanical layer with a piezoelectric layer

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

aligning a first layer of the MEMS structure with a second layer of the MEMS structure by positioning alignment posts through corresponding alignment openings in each of the first layer and the second layer

Methodology Applied

Scientific EffectMechanical alignment:

Implementation Method 3

laminating the first layer to the second layer

Methodology Applied

Scientific EffectAdhesive bonding: Adhesive

Data Source

PatentUS20250162860A1Methods of fabricating micro electro-mechanical systems structures

Publication Date: 2025.05.22 THE UNIV OF BRITISH COLUMBIA

AI summary

According to at least one embodiment, methods of fabricating micro electro-mechanical systems (MEMS) structures involving lamination of an electromechanical layer to a micromechanical structure are disclosed.