Near-Infrared Filter Composition for Light-Resistant Optical Sensing

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Solution Overview

Problem

Existing near-infrared transmitting filters and optical sensors face challenges in achieving excellent light resistance, which affects their accuracy and reliability in sensing near-infrared rays.

Innovation Solution

A composition comprising a near-infrared absorber, a color material that transmits near-infrared rays and shields visible light, a resin with a glass transition temperature of 100°C or higher, and a surfactant, including organic black coloring agents with perylene or lactam skeletons, and fluorine-based surfactants, is used to enhance light resistance and spectral stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a composition including a near-infrared absorber and a color material that transmits near-infrared rays and shields visible light is used, then light transmission and noise reduction are improved, but light resistance deteriorates

Engineering Contradiction:

Improvesensing accuracyVSAvoidlight resistance

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters by introducing a resin with glass transition temperature of 100°C or higher and a specific surfactant into the filter composition. This parameter modification maintains the optical properties (near-infrared transmission and visible light shielding) while significantly improving light resistance and durability under various environmental conditions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining near-infrared absorbers, color materials, high glass transition temperature resins, and surfactants. This composite approach allows the filter to simultaneously achieve multiple functions: near-infrared transmission, visible light shielding, and enhanced light resistance, resolving the contradiction between sensing accuracy and reliability

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If existing near-infrared transmitting filter compositions are used, then manufacturing is simpler, but light resistance and spectral stability deteriorate

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidlight resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent modifies the resin selection parameter by specifying resins with glass transition temperatures of 100°C or higher, which provides both improved light resistance and spectral stability while maintaining compatibility with existing manufacturing processes and materials

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If environmental conditions (temperature and humidity) increase, then operational challenges increase, but sensing accuracy must be maintained

Engineering Contradiction:

Improvesensing accuracyVSAvoidenvironmental degradation

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the resin's thermal parameter (glass transition temperature ≥100°C) to ensure the filter maintains its optical properties and structural integrity under elevated temperature and humidity conditions, thereby protecting sensing accuracy from environmental degradation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a surfactant in the composition that provides protective functionality against environmental factors such as humidity and temperature variations, creating a stable interface that prevents degradation and maintains sensing performance over time

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 composition significantly improves light resistance and spectral stability, allowing for accurate near-infrared sensing with reduced noise and long-term reliability, even under high temperature and humidity conditions.

Implementation Method 1

a near-infrared absorber

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

a color material that transmits near-infrared rays and shields visible light

Methodology Applied

Scientific EffectOptical absorption and transmission filtering: Absorption (EM radiation)

Implementation Method 3

a resin having a glass transition temperature of 100° C. or higher

Methodology Applied

Scientific EffectGlass transition:

Implementation Method 4

a surfactant

Methodology Applied

Scientific EffectSurfactant action: Surfactant

Data Source

PatentUS11982939B2Composition, film, dry film, pattern forming method, near-infrared transmitting filter, structure, optical sensor, and image display device

Publication Date: 2024.05.14 FUJIFILM CORP

AI summary

A composition includes a near-infrared absorber, a color material that transmits near-infrared rays and shields visible light, at least one compound selected from the group consisting of a resin having a glass transition temperature of 100° C. or higher, and a resin precursor of the resin having a glass transition temperature of 100° C. or higher, and a surfactant.