Plastic Lens with Red Light Absorption for Color Shift
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Solution Overview
Problem
Conventional color image sensors face issues with color saturation and peripheral color shift due to inadequate filtering of long-wavelength red light and infrared light, which affects image quality and requires costly IR cut coatings that are limited by material constraints.
Innovation Solution
An optical image lens assembly incorporating plastic optical lens elements with aspheric surfaces and a long-wavelength red light absorbing optical lens element, which filters out long-wavelength red light effectively while maintaining visible light transmission, ensuring optimal color saturation and minimizing peripheral color shift through precise refractive power and transmittance control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If IRCF (infrared cut coating filter) is used to filter long-wavelength red light, then cost is reduced, but color shift in peripheral region occurs due to wavelength shift when incident angle increases
Solution Approach 1:
The patent changes the material parameter from conventional coating filters to a plastic optical lens element with specific long-wavelength light absorption characteristics. The plastic material inherently absorbs long-wavelength red light and infrared light through its molecular structure, eliminating the angle-dependent wavelength shift problem of coating filters while maintaining cost-effectiveness.
Solution Approach 2:
The patent uses a composite approach by combining the optical lens element with long-wavelength light absorbing plastic material. This integration allows the lens to simultaneously perform focusing and infrared filtering functions, avoiding the need for separate IRCF coatings and eliminating color shift issues in peripheral regions.
2Manufacturing precision
If BG (infrared cut-off plate) is used to filter infrared light, then color shift in peripheral region is reduced, but cost increases and material selection is limited
Solution Approach 1:
The patent changes the material parameter from expensive BG glass to cost-effective plastic material that inherently absorbs long-wavelength red light and infrared light. The plastic optical lens element achieves the same filtering effect as BG while reducing cost and expanding material selection flexibility.
Solution Approach 2:
The patent merges the infrared filtering function with the optical lens element by using plastic material with inherent long-wavelength absorption. This combination eliminates the need for separate BG plates or IRCF coatings, reducing overall system cost while maintaining color uniformity across the imaging region.
3Illumination intensity
If conventional optical lens elements are used, then visible light transmission is achieved, but long-wavelength red light and infrared light are not sufficiently filtered, causing color saturation decrease
Solution Approach 1:
The patent changes the material parameter from conventional plastic or glass to a specialized plastic material with inherent long-wavelength absorption characteristics. This material selectively absorbs long-wavelength red light and infrared light while maintaining high transmission in the visible spectrum, achieving both goals simultaneously.
Solution Approach 2:
The patent converts the potential harm of long-wavelength red light and infrared light into a beneficial filtering effect. The plastic material's natural absorption of these wavelengths is utilized to improve image quality by preventing color saturation loss and false color reproduction, while the visible light transmission remains unaffected.
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 enhances color saturation and reduces peripheral color shift, achieving better filtering of infrared light while being cost-effective and suitable for miniaturization, with improved production stability and reduced aberration.
Implementation Method 1
the long-wavelength red light absorbing optical lens element can be penetrated by a visible light and can filter a long-wavelength red light
Implementation Method 2
a plurality of plastic optical lens elements having refractive power and aspheric surfaces
Data Source
AI summary
An optical image lens assembly includes a plurality of optical lens elements, wherein the optical lens elements include a plurality of plastic optical lens elements having refractive power and aspheric surfaces. Wherein at least one long-wavelength red light absorbing optical lens element made of a plastic material and having refractive powers is disposed within the optical image lens assembly, and the long-wavelength red light absorbing optical lens element can be penetrated by a visible light and can filter a long-wavelength red light.