Optical Body with Micro Uneven Anti-Reflection Layer
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Solution Overview
Problem
Conventional optical members with anti-reflection treatments fail to effectively suppress reflection of visible light and transmission of near-infrared light, leading to suboptimal performance in optical devices like image sensors.
Innovation Solution
An optical body comprising a base material with a dye-containing resin layer and an anti-reflection layer having a micro uneven structure, optimized for high spectral transmittance in the visible light range and low spectral transmittance in the near-infrared range, achieved through specific layer thicknesses and material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an anti-reflection layer with micro uneven structure is formed on a light incident surface, then anti-reflection performance for visible light is improved, but transmittance for near-infrared light increases (absorption performance deteriorates)
Solution Approach 1:
The optical body is segmented into multiple functional layers: a base material layer, a dye-containing resin layer, and an anti-reflection layer with micro uneven structure. Each layer performs a specific function - the base material provides structural support, the dye-containing resin layer absorbs near-infrared light, and the anti-reflection layer reduces visible light reflection. This segmentation allows independent optimization of each layer's properties to achieve both anti-reflection performance and near-infrared absorption.
Solution Approach 2:
The invention uses composite material structure combining different materials with complementary properties. The dye-containing resin layer uses materials with high near-infrared absorption coefficients, while the anti-reflection layer uses materials optimized for visible light anti-reflection. The combination of these materials in a layered composite structure enables simultaneous achievement of anti-reflection performance for visible light and absorption performance for near-infrared light.
2Adaptability or versatility
If optical members are designed for wide wavelength band photosensitivity, then application range is expanded, but selective wavelength control becomes difficult
Solution Approach 1:
Different regions of the optical body are assigned different optical properties tailored to specific wavelength ranges. The dye-containing resin layer is specifically designed with high absorption coefficients for near-infrared wavelengths, while the anti-reflection layer is optimized for visible light range. This local quality differentiation enables the optical body to exhibit wavelength-selective properties - high absorption in near-infrared region and low reflection in visible region - thereby achieving versatile application in image sensors requiring both properties.
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 excellent anti-reflection performance and transmittance for visible light while achieving good absorption performance for near-infrared light, enhancing the optical properties of devices across a wide wavelength range.
Implementation Method 1
an anti-reflection layer formed on the resin layer and having a micro uneven structure in at least one surface
Implementation Method 2
an anti-reflection layer formed on the resin layer and having a micro uneven structure in at least one surface
Implementation Method 3
a dye-containing resin layer formed on the base material
Data Source
AI summary
An optical body that has excellent anti-reflection performance and transmittance for light having wavelengths in the visible light band and good absorption performance for light having wavelengths in the near-infrared band is provided. To solve the above problem, the present disclosure provides an optical body 100 including a base material 20, a dye-containing resin layer 30 formed on the base material 20, and an anti-reflection layer 40 formed on the resin layer 30 and having a micro uneven structure in at least one surface. The average spectral transmittance of the optical body 100 for light in a wavelength range of 420 to 680 nm is 60% or greater, and the minimum spectral transmittance of the optical body 100 for light in a wavelength range of 750 to 1400 nm is less than 60%.