Multifunctional Polarizing Filter Integral Structure Vignetting
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Solution Overview
Problem
Existing polarizing filters for digital cameras, when combined with ultraviolet cut and near-infrared cut filters, result in increased thickness leading to vignetting phenomena that adversely affect image quality, particularly in medical and testing applications where clear images are critical.
Innovation Solution
A multifunctional polarizing filter with an integral structure and minimal thickness is achieved by using a glass substrate with a dielectric multilayer film and an antireflection coating, bonded with adhesives, allowing for efficient ultraviolet and near-infrared ray blocking without the need for multiple filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple filters (polarizing filter, ultraviolet cut filter, near-infrared cut filter) are attached separately to the front side of the lens, then each filter can perform its specific function, but the total thickness of the filters considerably increases causing vignetting phenomenon
Solution Approach 1:
The patent merges multiple separate filters (polarizing filter, ultraviolet cut filter, and near-infrared cut filter) into a single integrated multifunctional filter. The filter includes a polarizing film layer, an ultraviolet cut filter layer, and a near-infrared cut filter layer all combined in one structure that attaches to the lens front side, thereby reducing total thickness while maintaining all filter functions.
Solution Approach 2:
The patent creates a universal filter that performs multiple functions simultaneously: polarization control, ultraviolet ray blocking, and near-infrared ray blocking. This multifunctional filter replaces the need for multiple separate filters, achieving space efficiency while providing comprehensive optical control for digital camera applications.
2Length of stationary object
If a multifunctional polarizing filter with integral structure is created, then vignetting is prevented and image clarity is improved, but production challenges arise due to heat sensitivity and manufacturing complexity
Solution Approach 1:
The patent segments the manufacturing process into distinct sequential steps: first forming the polarizing film on a substrate, then separately forming the ultraviolet cut filter layer, and finally forming the near-infrared cut filter layer. This segmented approach allows each layer to be manufactured and optimized independently before integration, simplifying the overall production process despite the multifunctional nature of the final product.
Solution Approach 2:
The patent employs parameter changes in the manufacturing process, specifically controlling temperature parameters during the formation of each filter layer. By adjusting thermal parameters and using appropriate adhesives with suitable temperature ranges, the patent overcomes heat sensitivity issues during manufacturing while maintaining the integral structure of the multifunctional filter.
3Ease of manufacture
If separate filters are used, then manufacturing is simpler for each individual filter, but the combined thickness causes the captured image to be adversely affected by the frame of the filter
Solution Approach 1:
The patent combines multiple individual filters into one integrated unit, maintaining the manufacturing simplicity of producing each filter layer separately through sequential processing, while eliminating the cumulative thickness problem. The merged structure ensures that the overall filter assembly does not protrude enough to cause vignetting or frame interference in captured images.
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 prevents vignetting, ensuring clear and accurate images by maintaining a thin profile while effectively blocking ultraviolet and near-infrared rays, overcoming production challenges related to heat sensitivity and mass production limitations.
Implementation Method 1
an ultraviolet cut thin film formed of a dielectric multilayer film being stacked on a surface of the ultraviolet cut glass substrate positioned on the camera side
Implementation Method 2
coated with an antireflection coating
Implementation Method 3
the main body being bonded by only a first and second adhesive
Data Source
Figure 1~2
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Figure 5~6
AI summary
A multifunctional polarizing filter is used for a digital camera, and is produced by advanced optical technology to have a very small thickness and an integral structure in order to prevent a vignetting phenomenon in which the captured image is adversely affected by the frame of the filter.