Copper Glass Optical Filter for Angle-Stable UV and IR Blocking
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Solution Overview
Problem
Existing optical filters face challenges in maintaining stable transmission and blocking characteristics across varying incident angles, while also preventing ripple and petal flare phenomena, particularly in wide-angle cameras, and often suffer from reduced durability under harsh conditions.
Innovation Solution
An optical filter design comprising an infrared absorbing substrate with copper and specific dielectric films, where the V values of the dielectric films are optimized to ensure effective blocking of ultraviolet and infrared rays, maintaining high transmittance in visible light, and preventing ripple and petal flare, with a copper content ranging from 1 to 7 weight % and a V value sum of 15 to 50 and ratio of 4 to 12.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an infrared absorbing glass (blue glass) is used as the optical filter substrate, then the near-infrared absorption property is improved, but the visible light transmittance is reduced and durability under high temperature or high humidity conditions deteriorates
Solution Approach 1:
The patent uses a composite structure combining an infrared-absorbing glass substrate (containing CuO) with multiple dielectric film layers. This composite approach allows the substrate to provide infrared absorption while the dielectric films provide protective and optical functionality, resolving the contradiction between infrared absorption and durability.
Solution Approach 2:
The dielectric films act as intermediary layers between the infrared-absorbing substrate and the external environment. These films protect the substrate from harsh environmental conditions (high temperature and humidity) while allowing the substrate to maintain its infrared absorption properties.
2Object-affected harmful factors
If a dielectric film is used to block ultraviolet and infrared light, then the blocking characteristic is improved, but the transmittance curve shifts depending on the incident angle
Solution Approach 1:
The patent optimizes specific parameters of the dielectric films, including the V values (optical path differences) of the first and second dielectric films, and the ratio between them. By controlling these parameters within specific ranges, the transmittance curve stability against incident angle changes is achieved while maintaining effective UV and IR blocking.
Solution Approach 2:
The patent applies different dielectric film structures with different refractive indices at different locations/layers. The first dielectric film has specific optical properties optimized for one function, while the second dielectric film has different properties optimized for another function, allowing simultaneous achievement of blocking and angle stability.
3Illumination intensity
If the transmittance of the optical filter is increased to obtain a clearer picture, then the image quality is improved, but the petal flare phenomenon increases
Solution Approach 1:
The patent optimizes the V values and their ratio within specific ranges to control the optical characteristics of the dielectric films. This parameter optimization allows high visible light transmittance for clear imaging while suppressing the petal flare phenomenon through controlled interference effects.
Solution Approach 2:
The patent uses the principle of destructive interference in the dielectric film structure to convert potentially harmful reflections (which cause petal flare) into beneficial effects. By carefully designing the film thicknesses and refractive indices, reflections are suppressed at wavelengths that would cause petal flare while maintaining high transmission in the visible range.
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 optical filter achieves stable transmission characteristics across varying angles, effectively blocks ultraviolet and infrared rays, and prevents ripple and petal flare, while maintaining high durability under harsh conditions.
Implementation Method 1
An infrared absorbing glass is a glass filter where material such as CuO is added to the glass to selectively absorb light in the near infrared wavelength region
Implementation Method 2
a reflection layer adapting a dielectric film is known. When a dielectric film is used, light in the ultraviolet and/or infrared region can be blocked
Data Source
AI summary
The provided is an optical filter for its use. In the present invention, it is possible to provide an optical filter that effectively blocks ultraviolet ray and infrared ray and exhibits high transmittance in visible light. Furthermore, it is possible to provide an optical filter where the transmission characteristics are stably maintained even when an incident angle is changed. Moreover, it is possible to provide an optical filter that does not exhibit problems such as ripple and petal flare, and thus to provide the optical filter with excellent durability.