Multilayer Optical Filter for 1000-1200 Nm NIR Shielding

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Solution Overview

Problem

Existing optical filters do not provide sufficient shielding for near-infrared light in the 1,000 nm to 1,200 nm range, leading to image quality deterioration due to flare or ghost effects in imaging devices, and lack weather resistance and visual sensitivity correction properties.

Innovation Solution

An optical filter configuration comprising near-infrared absorbing glass, dielectric multilayer films, and an absorption layer with specific spectral characteristics to enhance transmittance in visible and specific near-infrared regions while effectively shielding other near-infrared light, ensuring high reliability and weather resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a dielectric multilayer film and a resin substrate containing a near infrared ray absorbing pigment are combined, then visible light and near infrared light in the vicinity of 800 nm are transmitted, but the shielding property for near infrared light of 1,000 nm to 1,200 nm is insufficient

Engineering Contradiction:

Improvetransmittance of visible light and 800 nm near infrared lightVSAvoidshielding property for 1,000 nm to 1,200 nm near infrared light

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent combines a resin substrate containing near infrared ray absorbing pigment with a dielectric multilayer film to create a composite optical filter structure. The resin substrate with pigment provides absorption in the 1,000-1,200 nm range, while the dielectric multilayer film provides selective transmission for visible light and 800 nm near infrared light, achieving both transmittance and shielding requirements through material composition

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The optical filter is divided into two functional segments: the resin substrate containing near infrared absorbing pigment that handles the 1,000-1,200 nm shielding, and the dielectric multilayer film that handles visible light and 800 nm near infrared transmission. This segmentation allows each component to optimize its specific function without compromising the other

Inventive Principle:

Principle #1Segmentation

2Reliability

If the light shielding property for near infrared light of 1,000 nm to 1,200 nm is improved, then image quality deterioration due to flare or ghost is reduced, but the complexity of the optical filter structure increases

Engineering Contradiction:

Improveimage quality and reduction of flare or ghostVSAvoidstructure of the optical filter

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the shielding function and the transmission function into a single integrated optical filter component. By combining the resin substrate with near infrared absorbing pigment and the dielectric multilayer film into one unit, the filter achieves both flare reduction and selective transmission without requiring multiple separate components, thus improving reliability while controlling structural complexity

Inventive Principle:

Principle #5Merging (Combining)

3Illumination intensity

If the transmittance of visible light is increased to correct the light receiving sensitivity curve, then the visual sensitivity correction property is improved, but the shielding property for other near infrared light may be compromised

Engineering Contradiction:

Improvetransmittance of visible light for sensitivity correctionVSAvoidshielding property for unwanted near infrared light

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The optical filter exhibits different optical properties in different wavelength regions: high transmittance in the visible range (450-600 nm) for sensitivity correction, selective transmission at 800 nm near infrared, and strong shielding at 1,000-1,200 nm near infrared. This local quality differentiation is achieved through the complementary characteristics of the resin substrate with pigment and the dielectric multilayer film

Inventive Principle:

Principle #3Local quality

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 filter achieves excellent transmittance in visible and specific near-infrared light regions, effective shielding of near-infrared light from 1,000 nm to 1,200 nm, and improved visual sensitivity correction, with enhanced weather resistance.

Implementation Method 1

a near infrared ray absorbing glass

Methodology Applied

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

Implementation Method 2

dielectric multilayer films laid on or above both major surfaces of the near infrared ray absorbing glass

Methodology Applied

Scientific EffectInterference: Interference

Implementation Method 3

an absorption layer laid on or above a surface of at least one of the dielectric multilayer films and having a maximum absorption wavelength in a near infrared light region

Methodology Applied

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

Data Source

PatentUS12631809B2Optical filter

Publication Date: 2026.05.19 AGC INC

AI summary

An optical filter, includes: a near infrared ray absorbing glass, dielectric multilayer films laid on or above both major surfaces of the near infrared ray absorbing glass, and an absorption layer laid on or above a surface of at least one of the dielectric multilayer films and having a maximum absorption wavelength in a near infrared light region, in which the optical filter satisfies all of spectral characteristics (i-1) to (i-5).