Diffuse Reflecting Optical Construction for Glare Reduction

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Solution Overview

Problem

Conventional window films reflect light in a specular manner, causing glare and potential hazards, while more reflective films are effective but annoying and hazardous due to their mirror-like reflections, and existing solutions for diffuse reflection are not cost-effective.

Innovation Solution

A low-cost method for manufacturing a diffuse reflecting transparent optical construction using a scratch-resistant hard coating applied to a textured surface with a reflective medium, which reflects light in a uniform, omni-directional manner and transmits light undistorted, suitable for windows and eyewear.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional reflective window film is used to reduce light and heat transmission, then solar protection is improved, but specular reflection causes glare and hazards

Engineering Contradiction:

Improvelight and heat transmissionVSAvoidspecular reflection glare

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The patent changes the surface geometry parameter from smooth to textured, transforming the reflection type from specular to diffuse. The textured surface scatters reflected light in multiple directions, eliminating the concentrated glare of specular reflection while preserving the energy-blocking function.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent combines multiple functional layers: a textured surface layer for diffuse reflection, a reflective coating layer for solar energy blocking, and a protective hard coating. This composite structure integrates the benefits of both diffuse scattering and reflective energy reduction without the hazards of specular reflection.

Inventive Principle:

Principle #40Composite materials

2Loss of energy

If more reflective coating is applied to increase solar protection, then heat rejection is improved, but reflection becomes more hazardous to viewers

Engineering Contradiction:

Improveheat rejectionVSAvoidhazardous reflection

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the surface texture parameter to create diffuse reflection, which scatters the hazardous concentrated reflections into a broader, safer distribution pattern. This allows high reflectivity for heat rejection without the mirror-like hazards.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If textured surface is used to achieve diffuse reflection, then glare is reduced, but light distortion occurs

Engineering Contradiction:

Improveglare reductionVSAvoidlight distortion

Core Design Contradiction:

Object-affected harmful factorsVSLoss of information

Solution Approach 1:

The patent creates a composite optical system where the textured surface provides diffuse reflection for glare reduction, while the underlying optical element (lens or window pane) with its protective hard coating maintains optical clarity and minimizes distortion. The hard coating specifically compensates for distortion caused by the textured surface.

Inventive Principle:

Principle #40Composite materials

4Object-affected harmful factors

If textured surface is applied to provide diffuse reflection, then specular glare is eliminated, but surface becomes susceptible to scratching and smudging

Engineering Contradiction:

Improvespecular glare eliminationVSAvoidscratch resistance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies a protective hard coating layer over the textured surface. This composite structure allows the textured surface to provide diffuse reflection while the hard coating layer protects against mechanical damage from scratching, abrasion, and smudging, significantly improving surface durability.

Inventive Principle:

Principle #40Composite materials

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

The solution provides a cost-effective, glare-reducing window film that minimizes distortion and prevents scratching, suitable for various applications including automotive, residential, and eyewear, while maintaining optical clarity and safety by reducing reflective glare.

Implementation Method 1

reflects light in a diffuse manner

Methodology Applied

Scientific EffectDiffuse reflection: Reflection

Implementation Method 2

reflects light in a uniform diffuse omni-directional manner

Methodology Applied

Scientific EffectLight scattering: Scattering

Implementation Method 3

transmits light in an undistorted manner

Methodology Applied

Scientific EffectLight transmission: Light

Implementation Method 4

protect against scratching, abrasion and smudging

Methodology Applied

Scientific EffectPhysical protection:

Data Source

PatentUS9244201B2Diffuse reflecting optical construction

Publication Date: 2016.01.26 DILLON STEPHEN M

AI summary

A transparent multi-layer optical construction that reflects light in a diffuse manner and transmits light in an undistorted manner. The optical construction can be made as a sunglass lens or as a thin film to be used as window film. The multi-layer optical construction is, in part, a combination of surface form and surface texture combined with a reflective medium and a scratch resistant hard coating.