Polymeric Conformal Coatings With Flow-Controlled Microscale Features

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Solution Overview

Problem

Existing polymeric conformal coating methods result in uncontrolled variations in thickness and shape, limiting the ability to form structured polymer layers with precise microscale features for applications like Fabry Perot interferometers and microlenses.

Innovation Solution

The use of a flow control screen in the deposition chamber to control the localized flow of gas, allowing for the formation of polymeric coatings with desired shape configurations and thickness variations on microscale dimensions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional polymeric conformal coating methods are used, then coating process simplicity is maintained, but coating thickness uniformity and shape control deteriorate

Engineering Contradiction:

Improvecoating thickness uniformityVSAvoiddeposition chamber complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

A flow control screen is introduced as an intermediary component in the deposition chamber. This screen mediates between the monomer gas source and the substrate, controlling the localized flow of gas to achieve uniform coating thickness and desired shape configurations without requiring complex deposition chamber designs.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The flow control screen enables different regions of the substrate to receive controlled amounts of monomer gas, creating local variations in coating thickness and shape as needed. This allows specific areas to have different coating properties while maintaining overall process simplicity.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If uniform coating thickness is achieved, then planar layer quality is improved, but ability to form structured microscale features deteriorates

Engineering Contradiction:

Improvecoating thickness controlVSAvoidstructured feature formation capability

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The flow control screen is designed with varying aperture sizes, shapes, and distributions to create local quality variations in the coating. This enables the formation of structured microscale features such as microlenses and interferometer components while maintaining precise thickness control in each local region according to the screen's design.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

By changing the parameters of the flow control screen (aperture size, shape, distribution, and spacing), the coating process can be adapted to form different structured features. This provides versatility in creating various microscale structures while maintaining manufacturing precision through controlled parameter selection.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If monomer gas flow is increased to speed up coating deposition, then productivity is improved, but coating thickness uniformity deteriorates

Engineering Contradiction:

Improvecoating deposition rateVSAvoidcoating thickness uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The flow control screen acts as a mediator that distributes monomer gas flow uniformly across the substrate surface even at high deposition rates. The screen's aperture structure regulates the gas flow locally, preventing areas of excessive or insufficient deposition and maintaining thickness uniformity while enabling high productivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 the production of polymer film interferometers and microlenses with improved reflected signal intensity and sensitivity by controlling the coating growth to achieve specific microscale features.

Implementation Method 1

the monomer simultaneously adsorbs into the surface and polymerises into long polymer chains to grow a conformal polymer coating layer on the surface

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 2

the monomer simultaneously adsorbs into the surface and polymerises into long polymer chains

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 3

the flow control screen is spaced apart from the surface and is configured to control a localised flow of the gas in the chamber so as to impose a structure on the deposited coating

Methodology Applied

Scientific EffectGas flow control:

Implementation Method 4

dispersing a gas into the chamber from which the polymeric coating is deposited on the surface

Methodology Applied

Scientific EffectVapour deposition: Physical Vapour Deposition

Data Source

PatentUS12447501B2Methods and apparatuses for fabricating polymeric conformal coatings, parts coated with polymeric conformal coatings, and optical apparatus including said parts

Publication Date: 2025.10.21 UCL BUSINESS LTD

AI summary

A method of forming a vapour deposited polymeric conformal coating on a surface of a part (23). The method comprises placing the part (23) and a flow control screen in a deposition chamber (22); dispersing a gas into the chamber (22) from which the polymeric coating is deposited on the surface. The flow control screen is spaced apart from the surface and is configured to control a localised flow of the gas in the chamber so as to impose a structure on the deposited coating.