Resin Near-Infrared Cut Filter with Squarylium Dye
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional near-infrared cut filters for solid-state image sensing elements, such as CCDs and CMOS image sensors, face challenges in achieving high transmittance in the visible region, wide viewing angle, and sufficient near-infrared cutting capacity while maintaining moisture absorption resistance and impact resistance.
Innovation Solution
A near-infrared cut filter comprising a resin substrate with a light absorber derived from a specific compound structure, such as squarylium-based compounds, is used, which provides high transmittance in the visible region, a wide viewing angle, and excellent near-infrared cutting capacity, with the light absorber contained in a specific amount within the resin substrate to ensure optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal is vapor-deposited on a glass substrate to achieve near-infrared cutting, then near-infrared cutting capacity is improved, but production cost increases and glass substrate fragments cause contamination
Solution Approach 1:
The patent changes the material parameters by replacing glass substrate with resin substrate and replacing metal vapor-deposition with organic dye incorporation, thereby reducing production cost and contamination while maintaining near-infrared cutting function
Solution Approach 2:
The patent uses inexpensive organic dyes instead of expensive metal vapor-deposition processes, making the filter more cost-effective and suitable for mass production in solid-state imaging devices
2Reliability
If an inorganic glass substrate is used for near-infrared cutting, then near-infrared cutting capacity is improved, but adaptability to size and thickness reduction is limited
Solution Approach 1:
The patent changes the substrate material from inorganic glass to organic resin, enabling the filter to be made thinner and more adaptable to miniaturized solid-state imaging devices while retaining near-infrared cutting functionality
Solution Approach 2:
The resin substrate allows the filter to be manufactured as a thin film that can be easily integrated into compact imaging devices, overcoming the rigidity and thickness limitations of glass substrates
3Ease of manufacture
If a transparent resin with near infrared-absorbing dye is used, then production cost is reduced and adaptability is improved, but near infrared-absorbing capacity is insufficient
Solution Approach 1:
The patent optimizes the concentration parameter of the organic dye within the resin substrate to achieve sufficient near-infrared absorption capacity while maintaining the advantages of low cost and high adaptability
Solution Approach 2:
The patent creates a composite material system combining transparent resin with specifically formulated organic dye, achieving both economic manufacturing and effective near-infrared cutting performance
4Reliability
If existing near-infrared cut filters are used, then near-infrared cutting capacity is improved, but transmittance in the visible region is insufficient or viewing angle is narrow
Solution Approach 1:
The patent applies local quality by using a resin substrate with specifically selected organic dye that provides different optical properties in different wavelength regions, achieving high visible transmittance and wide viewing angle while maintaining near-infrared cutting capacity
Solution Approach 2:
The patent changes the optical parameters by selecting organic dyes with specific absorption characteristics that allow high visible light transmission while providing effective near-infrared rejection, and by optimizing dye concentration to balance these 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 results in a near-infrared cut filter with high transmittance in the visible region, low hygroscopicity, and a wide viewing angle, preventing film warping and foreign substance contamination, enabling thinner and smaller solid-state imaging devices.
Implementation Method 1
a near-infrared cut filter which selectively transmits or cuts light rays in a specific wavelength range
Implementation Method 2
a near-infrared cut filter in which a transparent resin is used as a substrate and a near infrared-absorbing dye is incorporated into the transparent resin
Data Source
AI summary
The present invention provides a near-infrared cut filter comprises a resin substrate (I) which comprises a resin and a light absorber (A) having a structure derived from a compound represented by the following Formula (I), wherein the light absorber (A) is contained in the resin substrate (I) in an amount of 0.001 to 0.01 parts by weight with respect to 100 parts by weight of the resin.