Optical Filter with UV IR Pigment Resin for High Angle Shielding
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Solution Overview
Problem
Existing optical filters fail to maintain high transparency for visible light and effective shielding of near-infrared and ultraviolet light, particularly at high incident angles, leading to image quality degradation due to flare and ghost effects in imaging devices.
Innovation Solution
An optical filter configuration with a dielectric multilayer film on a substrate containing UV and IR pigments, ensuring specific spectral characteristics that maintain high transparency and shielding properties across various incident angles, including a resin film thickness of 3 μm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dielectric multilayer film is used for UV and IR shielding, then visible light transparency is improved, but shielding property deteriorates at high incident angles
Solution Approach 1:
The patent combines a dielectric multilayer film with a resin film containing UV and IR absorbing pigments to create a composite optical filter. The dielectric multilayer film provides visible light transparency through selective reflection, while the resin film with pigments ensures consistent UV and IR shielding across all incident angles by absorption, compensating for the angle-dependent limitations of the dielectric structure alone.
2Illumination intensity
If incident angle increases, then visible light transmission is maintained, but UV light shielding property deteriorates
Solution Approach 1:
The patent changes the shielding mechanism from purely reflective (dielectric multilayer) to absorptive (pigment-containing resin) for UV light. The UV absorbing pigment in the resin film absorbs UV photons regardless of incident angle, maintaining consistent shielding performance. This parameter change in the shielding mechanism resolves the angle-dependent deterioration of UV protection.
3Manufacturing precision
If dielectric multilayer film is used, then spectral selectivity is improved, but angle independence deteriorates
Solution Approach 1:
The patent segments the optical filter into two functional layers: a dielectric multilayer film segment for spectral selectivity and visible light transmission, and a resin film segment with UV and IR pigments for angle-independent shielding. Each segment performs its specialized function, and their combination achieves both spectral precision and angular versatility.
Data Source
AI summary
An optical filter includes: a substrate; and a dielectric multilayer film laid on or above at least one major surface of the substrate, in which the substrate includes a resin film including a resin, a UV pigment 1 having a maximum absorption wavelength in 360 nm to 390 nm in the resin, and an IR pigment having a maximum absorption wavelength in 680 nm to 800 nm in the resin, and the optical filter satisfies all of spectral characteristics (i-1) to (i-8).