Six-Lens Wide-Angle Assembly for Compact High-Resolution Imaging
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Solution Overview
Problem
Existing wide-angle lens assemblies struggle to meet the requirements of large field of view, miniaturization, small F-number, and high resolution simultaneously.
Innovation Solution
A wide-angle lens assembly comprising a specific arrangement of lenses with negative, positive, and negative refractive powers, including air gaps between certain lenses, and adhering to certain curvature and focal length ratios, to enhance field of view, resolution, and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the field of view is increased to achieve large angle coverage, then the field of view parameter improves, but the total lens length increases making miniaturization difficult
Solution Approach 1:
The lens assembly is divided into six individual lens elements (first through sixth lenses) with alternating positive and negative refractive powers. Each lens element is independently designed with specific curvature radii and thicknesses, allowing the system to achieve wide-angle performance through distributed optical power rather than requiring a single long focal length element.
Solution Approach 2:
The patent employs specific parameter relationships to control optical performance: the ratio (CT1+CT2)/CT4 is constrained to 5.2-7.7 where CT represents thickness parameters, and the curvature ratio |R61/R52| is constrained to 1-5. These parameter constraints enable compact lens spacing while maintaining wide field of view through optimized refraction at each interface.
2Illumination intensity
If the F-number is reduced to improve light gathering capability, then the F-number parameter improves, but aberration control becomes more difficult affecting optical performance
Solution Approach 1:
Different regions of the lens assembly are assigned different refractive powers to optimize local optical functions. The first lens has negative refractive power for wide-angle correction, the second and third lenses have positive power for focusing, the fourth lens has negative power for aberration control, and the fifth lens has positive power for image formation. This local differentiation allows small F-number with controlled aberrations.
Solution Approach 2:
The lens elements employ asymmetric surface curvatures with specific radius ratios (|R61/R52| between 1-5) to balance spherical aberration and coma. The asymmetric design of each lens element's object-side and image-side surfaces allows optimization of light ray paths at different angles while maintaining small F-number performance.
3Measurement precision
If the resolution is increased to achieve high image quality, then the resolution parameter improves, but the lens structure becomes more complex affecting miniaturization
Solution Approach 1:
The lens assembly incorporates an air gap between the fourth and fifth lenses, creating a dynamic spacing region that allows flexible optical path control. This air gap enables the system to achieve high resolution through precise ray control without requiring additional complex lens elements, thereby maintaining relative structural simplicity for miniaturization.
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 achieves an increased field of view, improved resolution, and effective aberration correction while maintaining a compact design.
Implementation Method 1
The first lens is with negative refractive power. The second lens is with positive refractive power. The third lens is with positive refractive power. The fourth lens is with negative refractive power. The fifth lens is with positive refractive power and includes a convex surface facing an image side. The sixth lens is with refractive power.
Data Source
AI summary
A wide-angle lens assembly, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, satisfies: 5.2≤(CT1+CT2)/CT4≤7.7; 1≤|R61/R52|≤5; wherein CT1 is an interval from an object side surface of the first lens to an image side surface of the first lens along an optical axis, CT2 is an interval from an object side surface of the second lens to an image side surface of the second lens along the optical axis, CT4 is an interval from an object side surface of the fourth lens to an image side surface of the fourth lens along the optical axis, R61 is a radius of curvature of an object side surface of the sixth lens, and R52 is a radius of curvature of an image side surface of the fifth lens.