Dye-Resin Optical Filter With Dielectric Multilayer Band Selection
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Solution Overview
Problem
Existing optical filters do not effectively transmit near-infrared light with wavelengths longer than 900 nm and block other near-infrared light, which is necessary for applications using laser light in the 950 nm range, and also fail to maintain high transparency for visible light and near-infrared light across various incident angles.
Innovation Solution
An optical filter configuration comprising a substrate with a dielectric multilayer film and a resin film containing a dye with a maximum absorption wavelength of 690 to 900 nm, which satisfies specific spectroscopic characteristics for transmitting visible and near-infrared light while blocking other near-infrared wavelengths, maintaining high transparency and blocking ability across different angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If existing optical filters are used to transmit visible light and near-infrared light in the 800-900 nm range, then faithful image reproduction is achieved, but near-infrared light with wavelengths longer than 900 nm cannot be transmitted
Solution Approach 1:
The patent changes the optical parameters of the filter by using a resin film with specifically selected dyes having maximum absorption wavelengths in the 690-900 nm range, combined with a dielectric multilayer film, to achieve transmission in the 900-1000 nm range while blocking other near-infrared wavelengths. This parameter optimization resolves the contradiction by enabling transmission of longer wavelength near-infrared light without sacrificing visible light image reproduction quality.
2Object-affected harmful factors
If an optical filter blocks near-infrared light in the 700-900 nm range, then noise is reduced, but transparency for visible light and near-infrared light is compromised
Solution Approach 1:
The patent segments the near-infrared spectrum into different wavelength ranges and applies different transmission characteristics to each segment. The filter blocks near-infrared light in the 700-900 nm range (reducing noise) while transmitting near-infrared light in the 900-1000 nm range (maintaining transparency for useful wavelengths). This segmentation approach resolves the contradiction by selectively managing different wavelength segments.
Solution Approach 2:
The patent applies local quality by giving different parts of the spectrum different transmission properties through the combination of dye-absorbing resin film and dielectric multilayer film. The filter structure is designed to have high transmission in specific wavelength bands (visible and 900-1000 nm near-infrared) while providing strong blocking in other bands (700-900 nm near-infrared), thus resolving the contradiction between noise reduction and transparency.
3Object-affected harmful factors
If an optical filter maintains high blocking ability for near-infrared light, then noise is reduced, but transparency for visible light decreases
Solution Approach 1:
The patent introduces a resin film containing dye as an intermediary layer between the substrate and the dielectric multilayer film. This intermediary layer selectively absorbs near-infrared light in the 700-900 nm range while being relatively transparent to visible light, allowing the dielectric multilayer film to provide enhanced blocking in its designated bands without compromising visible light transmission. This intermediary approach resolves the contradiction between near-infrared blocking and visible light transparency.
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 high transparency for visible and near-infrared light, particularly in the 900 to 1,000 nm range, while effectively blocking near-infrared light in the 700 to 900 nm range, even at large incident angles, ensuring faithful image reproduction and reducing noise.
Implementation Method 1
a resin film including a dye (I) having a maximum absorption wavelength in a wavelength of 690 to 900 nm in dichloromethane
Implementation Method 2
a dielectric multilayer film laid on or above at least one major surface of the substrate as an outermost layer
Data Source
AI summary
An optical filter including: a substrate; and a dielectric multilayer film laid on or above at least one major surface of the substrate as an outermost layer, in which the substrate includes a resin film including a dye (I) having a maximum absorption wavelength in a wavelength of 690 to 900 nm in dichloromethane, and a resin, the optical filter transmits visible light and light in at least part of a wavelength of 900 to 1,000 nm, and the optical filter satisfies specific spectroscopic characteristics.