Wide-Angle Lens Group Segmentation for 122° Field of View
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Solution Overview
Problem
Existing optical systems struggle to achieve a large field of view (FOV) without compromising modulation transfer function (MTF) and distortion, particularly in wide-angle lens applications such as eye-tracking devices.
Innovation Solution
A wide-angle optical lens system comprising a specific arrangement of negative-powered, positive-powered, and positive-powered lens groups, including substrates and lenses with aspheric surfaces, fabricated using wafer-level optics, which maintains MTF and distortion within acceptable limits while achieving a FOV of 122°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional optical system uses more lenses to achieve a large field of view, then the field of view increases, but the system complexity and overall length increase
Solution Approach 1:
The optical system is divided into three distinct lens groups (first negative-powered group, second positive-powered group, third positive-powered group) with specific focal length ratios. This segmentation allows each group to contribute differently to the overall optical function, achieving wide FOV while controlling the total number of lenses to five elements.
Solution Approach 2:
The patent specifies precise parameter ranges including focal length ratios (f1/f2 between -0.5 to -0.2, f2/f3 between 0.3 to 0.8), curvature radii relationships, and spacing constraints. By optimizing these parameters, the system achieves 100°+ FOV while maintaining compact size and acceptable distortion levels.
2Measurement precision
If a conventional optical system increases the number of lenses to maintain MTF at wide angles, then MTF is preserved, but the overall length and complexity increase
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements that dynamically correct optical aberrations across the wide field of view. The aspheric coefficients are optimized to maintain MTF performance at various field angles without requiring additional lens elements that would increase overall length.
Solution Approach 2:
The system uses lens materials with different Abbe numbers (vd1, vd2, vd3) and refractive indices to achieve chromatic aberration correction and maintain MTF performance. The combination of materials with specific optical properties allows compact design while preserving image quality.
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 achieves a FOV of 122° with MTF greater than 0.55 and distortion less than 25%, while reducing the number of lenses and overall length compared to conventional systems.
Implementation Method 1
A wide-angle optical lens system includes a negative-powered first lens group, a positive-powered second lens group and a positive-powered third lens group arranged in an order from an object side to an image side
Data Source
AI summary
A wide-angle optical lens system includes a negative-powered first lens group, a positive-powered second lens group and a positive-powered third lens group arranged in an order from an object side to an image side.