Electrostatic Bonding of Offset MEMS Elements

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Solution Overview

Problem

Existing MEMS fabrication processes face limitations due to size constraints and control issues when using tools to move and bond offset mechanism elements, which can lead to damage and inaccuracies as devices become more complex and smaller.

Innovation Solution

Applying a voltage across an offset mechanism element and a bonding layer to generate an electrostatic charge, drawing the element to the bonding layer for precise positioning and anodic bonding without the need for physical tools.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a physical tool is used to move and bond the offset mechanism element, then the element can be positioned offset from the mechanism layer, but the size of the element is limited by the physical size constraints of the tool

Engineering Contradiction:

Improvepositioning precisionVSAvoidelement size

Core Design Contradiction:

Manufacturing precisionVSLength of moving object

Solution Approach 1:

The patent replaces the mechanical tool-based system with an electrostatic field-based system. Instead of using a physical tool to push and position the offset mechanism element, the invention applies a voltage to generate electrostatic forces that attract the element to the bonding layer, enabling precise positioning without mechanical contact and eliminating size constraints associated with physical tools.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the physical state and interaction parameters by introducing electrostatic forces through voltage application. By controlling the voltage parameter, the system can precisely control the positioning and bonding of the offset mechanism element, replacing the need for mechanical force and contact.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If a physical tool is used to move the offset mechanism element, then the element can be bonded to the bonding layer, but control issues arise in accurately positioning and aligning the tool with the element

Engineering Contradiction:

Improvebonding capabilityVSAvoidtool alignment accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent eliminates the mechanical tool alignment problem by replacing the mechanical positioning system with an electrostatic field system. The voltage application creates electrostatic forces that naturally guide and position the offset mechanism element onto the bonding layer, removing the need for precise mechanical tool alignment and eliminating associated control issues.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If a physical tool applies force to move the offset mechanism element, then the element can be positioned, but the element may sustain damage from the applied force

Engineering Contradiction:

Improvepositioning capabilityVSAvoidelement structural integrity

Core Design Contradiction:

Manufacturing precisionVSStrength

Solution Approach 1:

The patent replaces mechanical force application with electrostatic force application. The electrostatic field exerts distributed forces on the offset mechanism element without physical contact, avoiding concentrated mechanical stresses that could damage the element while still achieving the necessary positioning and bonding forces.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the nature of the applied force from mechanical contact force to electrostatic field force. By controlling the voltage parameter, the system can adjust the electrostatic force magnitude to achieve positioning and bonding without exceeding the structural strength limits of the offset mechanism element.

Inventive Principle:

Principle #35Parameter changes

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 allows for precise and damage-free positioning and bonding of offset mechanism elements, overcoming size and control limitations in MEMS fabrication, enabling the creation of more complex and smaller devices.

Implementation Method 1

Applying a voltage across an offset mechanism element and a bonding layer to generate an electrostatic charge between the offset mechanism element and the bonding layer. The electrostatic charge draws the offset mechanism element to the bonding layer.

Methodology Applied

Scientific EffectElectrostatic charge: Electrostatics

Data Source

PatentUS8404568B2Systems and methods for fabricating an out-of-plane MEMS structure

Publication Date: 2013.03.26 HONEYWELL INTERNATIONAL INC

AI summary

System and methods offset mechanism elements during fabrication of Micro-Electro-Mechanical Systems (MEMS) devices. An exemplary embodiment applies a voltage across an offset mechanism element and a bonding layer of a MEMS device to generate an electrostatic charge between the offset mechanism element and the bonding layer, wherein the electrostatic charge draws the offset mechanism element to the bonding layer. The offset mechanism element and the bonding layer are then bonded.