Z-Position Motion Stage Dither Balancing for SPM

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Solution Overview

Problem

Scanning probe microscopy systems face inaccuracies due to net resultant forces from the driving dither, which can cause resonance and displacement issues, especially when the dither operates at frequencies matching the scanner's resonance modes, restricting the design and form-factor of the scanner body.

Innovation Solution

A z-position motion stage with a driving dither positioned near an edge of the scanner body and a force balancing means opposite the dither across the neutral center, oscillating in harmony to counteract the resultant force and mitigate resonances, allowing for more flexible design and reduced parasitic displacements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the driving dither is positioned near the center or symmetrically arranged, then the scanner body maintains good balance and stability, but the design flexibility and form-factor are restricted

Engineering Contradiction:

Improvescanner body balanceVSAvoiddesign flexibility

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent positions the driving dither near an edge of the scanner body rather than at the center, creating an unbalanced configuration. This unbalanced position acts as a counterweight arrangement that allows the system to achieve both design flexibility and operational stability by strategically placing the dither where it can effectively drive the cantilever while maintaining overall scanner balance through careful mechanical design.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

2Productivity

If the driving dither operates at high frequency to drive cantilever oscillation, then imaging resolution and scanning speed improve, but resonance and parasitic displacement increase

Engineering Contradiction:

Improvescanning speedVSAvoidresonance and displacement

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent acknowledges that operating the driving dither at high frequencies necessary for fast scanning and high-resolution imaging inevitably causes resonance and parasitic displacement. Instead of avoiding these harmful effects, the design accepts them as necessary byproducts and manages them through the unbalanced positioning strategy, converting the potential harm into acceptable operational characteristics that enable high-speed, high-resolution imaging.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Adaptability or versatility

If the driving dither is positioned off-center near an edge, then design flexibility and form-factor are improved, but net resultant forces cause resonance and displacement inaccuracies

Engineering Contradiction:

Improvedesign flexibilityVSAvoidscanning accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent deliberately positions the driving dither off-center near an edge of the scanner body, creating an unbalanced configuration that provides design flexibility and optimized form-factor. The unbalanced position is strategically chosen to allow the dither to effectively drive cantilever oscillation while the overall mechanical design compensates for the offset, maintaining scanning accuracy despite the asymmetric placement.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

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 configuration effectively cancels out net resultant forces, reducing undesired resonances and displacements, thereby improving the accuracy and flexibility of the scanning probe microscopy system's design and operation.

Implementation Method 1

The driving dither is configured to impart a first oscillation for driving a cantilever of a probe associated to the driving dither in an oscillating motion

Methodology Applied

Scientific EffectOscillation: Vibration

Implementation Method 2

especially when the dither operates at frequencies matching the scanner's resonance modes

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS20240393363A1Active dither balancing of a motion stage for scanning probe microscopy

Publication Date: 2024.11.28 NEARFIELD INSTR BV

AI summary

The present disclosure concerns a z-position motion stage for use in a scanning probe microscopy system, a scanning probe microscopy system, and a method of operating the motion stage. The motion stage (1) comprises, a scanner body (10) and a driving dither (30) for driving a cantilever (51) of a probe (50) associated to the driving dither in an oscillating motion (31). The stage further comprises at least a first force balancing means (60), that acts onto the scanner body at a position opposite the driving dither (30) across a neutral center (N) of the motion stage (1), wherein the force balancing means (60) comprises at least a first balance dither (61) configured to oscillate in harmony with the driving dither.