Crystal Coating Optical Low Pass Filter for Thin Drop-Resistant Design
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Solution Overview
Problem
Traditional optical low pass filters using infrared absorbing glass are thick, fragile, and have poor drop resistance, and they increase the thickness of the product, which is a problem in the field of optical low pass filters for CCD and CMOS image sensors.
Innovation Solution
A crystal coating optical low pass filter is developed, where a crystal plate is coated with ink to achieve an infrared absorbing effect, reducing thickness and improving durability, and the manufacturing process involves steps like stone cutting, grinding, polishing, cleaning, and vacuum coating to ensure precise spectral properties and thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If infrared absorbing glass is used in traditional OLPF, then infrared absorption effect is achieved, but product thickness increases and fragility increases
Solution Approach 1:
The patent replaces traditional thick infrared absorbing glass with a thin film ink layer coated on the crystal plate. This thin film approach achieves the same infrared absorption function while reducing thickness to less than 0.1mm and eliminating the fragility issues associated with glass.
Solution Approach 2:
The patent changes the material form from bulk glass to thin film coating, fundamentally altering the physical parameters of the infrared absorption medium. This parameter change enables both thickness reduction and improved mechanical properties while maintaining optical performance.
2Reliability
If infrared absorbing glass is added to OLPF, then infrared absorption is improved, but product thickness increases
Solution Approach 1:
The patent uses a thin film ink layer instead of bulk glass to achieve infrared absorption. The film thickness is controlled to be less than 0.1mm, which maintains the infrared absorption performance while dramatically reducing the overall filter thickness compared to traditional glass solutions.
Solution Approach 2:
The patent creates a composite structure by coating ink on the crystal plate surface. This composite material approach combines the crystal's optical properties with the ink's infrared absorption properties, achieving both functions in a thin, integrated structure.
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 crystal coating optical low pass filter achieves a similar infrared absorbing effect to traditional glass without the thickness and fragility issues, with a reduced thickness of less than 0.1 mm, enhancing product quality and resistance to drops while maintaining spectral accuracy within ±1% deviation.
Implementation Method 1
the ink used has an infrared absorbing effect
Implementation Method 2
The beam of the target image information generates birefringence after paving the OLPF
Implementation Method 3
the UV-IR cut-off film, the AR film, and the IR film are evaporated by the vacuum coating device
Data Source
AI summary
The present invention discloses a crystal coating optical low pass filter, which includes a UV-IR cut-off film, a crystal plate, an ink layer, and an AR film. The UV-IR cut-off film can be replaced with an IR film. By coating the crystal plate with ink having infrared absorbing effect to form an ink layer, the present invention possesses both the birefringence characteristic of the crystal and the effect similar to infrared absorbing glass. Compared with the traditional OLPF using infrared absorbing glass, the thickness of the product is reduced and the situation that the infrared absorb glass is fragile and has a poor resistance to drop is significantly improved. The present invention can be used in smartphones, digital cameras, in-vehicle cameras, security cameras and has a large space of marketing.