Optical System With Aspherical Lenses for Uniform PSF Deblurring
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Solution Overview
Problem
Existing optical systems fail to provide sufficient resolution for modern image sensors with small pixel sizes, leading to inadequate image restoration and inefficient use of image restoration methods.
Innovation Solution
An optical system with a lens assembly and image sensor configuration that achieves uniform point spread function (PSF) across the field of view (FOV) by optimizing the flange back length and focal length ratios, using aspherical lenses and an infrared filter, and employing a single PSF for image deblurring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional optical calculation techniques are used to design lenses, then the optical system size can be reduced, but the resolution becomes insufficient for modern image sensors with small pixel sizes
Solution Approach 1:
The patent applies parameter changes by optimizing specific optical parameters including the ratio of flange back length to axial distance (FBL/TTL > 0.10) and flange back length to focal length (FBL/FL > 0.14). These parameter optimizations enable the optical system to achieve uniform PSF across the FOV while maintaining a compact form factor suitable for modern electronic devices with small pixel sizes
Solution Approach 2:
The patent employs aspherical lenses in the lens assembly to correct optical aberrations and achieve uniform point spread function across the field of view. The aspherical surfaces allow for better control of light paths, improving resolution without increasing optical system size, thereby resolving the contradiction between compact size and sufficient resolution
2Measurement precision
If optical systems are designed to increase resolution, then image quality improves, but the system becomes less efficient at restoring images and implementing image restoration methods
Solution Approach 1:
The patent applies local quality by designing the optical system to achieve uniform PSF characteristics across different zones of the FOV. By optimizing the lens assembly so that the FWHM of PSF remains consistent from center to edge zones, the system ensures that a single PSF can be used for image restoration across the entire image, significantly improving restoration efficiency while maintaining high resolution
Solution Approach 2:
The patent changes the optical parameters specifically to achieve uniform PSF across the FOV, with the FWHM deviation within 30% across 80% or more of the FOV. This parameter optimization enables efficient image restoration by allowing the use of a single representative PSF for deblurring operations across the entire image, thereby improving productivity
3Measurement precision
If the FWHM of PSF is reduced in the central zone, then center image quality improves, but the FWHM of PSF in edge zones increases, creating non-uniform blurring
Solution Approach 1:
The patent applies local quality by making different zones of the FOV have similar PSF characteristics through careful lens design. The lens assembly is optimized so that while the central zone maintains high quality, the edge zones are compensated to achieve uniform PSF FWHM across the entire FOV, with deviation within 30% across 80% or more of the area
Solution Approach 2:
The patent uses aspherical lens surfaces to control and balance the PSF characteristics across different FOV zones. The aspherical curvatures are specifically designed to compensate for edge zone aberrations while maintaining central zone quality, achieving uniform PSF distribution across the entire field of view
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 system enhances image quality by uniformly reducing blurring across the FOV, enabling efficient image restoration with reduced computational cost and device size.
Implementation Method 1
a lens assembly comprising a plurality of lenses, and an image sensor configured to sense light passing through the lens assembly
Data Source
AI summary
An optical system includes a lens assembly comprising a plurality of lenses, and an image sensor configured to sense light passing through the lens assembly, wherein, for a point light source positioned in a central zone of a field of view (FOV), a full width at half maximum (FWHM) of a point spread function (PSF) of the optical system is greater than an FWHM of a PSF of a reference system, wherein the reference system comprises a same number of lenses as the plurality of lenses and another image sensor and is configured to optimize a modulation transfer function (MTF), and wherein, for a point light source positioned in an edge zone of the FOV, the FWHM of the PSF of the optical system is smaller than the FWHM of the PSF of the reference system.