Six-Lens Wide Angle Design for Aberration Correction
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Solution Overview
Problem
Current camera lenses with high-pixel CCD or CMOS components face challenges in achieving excellent optical characteristics, ultra-thinness, and low F-number (FNO) values, particularly in wide-angle applications, where aberration correction and miniaturization are difficult to achieve simultaneously.
Innovation Solution
A wide-angle lens design comprising six lenses with specific refractive powers and focal lengths, including a plastic material composition, carefully optimized to achieve a short total optical length, low FNO, and improved imaging quality, with a structure that corrects aberrations and maintains miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a wide angle lens is designed to be ultra-thin with short total optical length, then the lens can be miniaturized for mobile phone cameras, but it becomes difficult to correct aberrations and achieve excellent optical characteristics
Solution Approach 1:
The lens system is divided into six individual lens elements with alternating positive and negative refractive powers. Each lens element is optimized for specific aberration correction, allowing the system to achieve excellent optical characteristics despite the ultra-thin design. The segmentation enables distributed correction of various optical aberrations that would be difficult to correct in a single compact element.
Solution Approach 2:
Each lens element is assigned specific local optical properties and refractive powers tailored to correct particular aberrations at different positions in the optical path. The first lens has positive refractive power for initial convergence, while subsequent lenses alternate between positive and negative powers to correct specific aberrations locally, achieving overall excellent optical performance in a compact configuration.
2Ease of manufacture
If the lens structure is simplified to reduce complexity, then manufacturing becomes easier, but aberration correction capability deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including refractive power ratios, focal length relationships, and curvature radii. These parameter optimizations enable effective aberration correction while maintaining manufacturing feasibility. The use of plastic materials for all six lenses further simplifies manufacturing compared to glass, while the parameter constraints ensure optical performance.
Solution Approach 2:
The lens system uses plastic materials for all six lens elements, combining the advantages of lightweight, ease of molding, and cost-effectiveness. The composite structure of multiple plastic lenses with different refractive indices and Abbe numbers enables effective aberration correction while maintaining manufacturing simplicity and reducing overall system complexity.
3Illumination intensity
If the F-number is reduced to achieve brighter imaging, then night shooting capability improves, but the lens structure becomes more complex and harder to miniaturize
Solution Approach 1:
The lens system achieves a low F-number (F/2.0 or smaller) through dynamic optimization of the aperture diameter relative to the focal length. The alternating positive and negative refractive power configuration allows for a larger effective aperture while maintaining compact total optical length, enabling bright imaging without proportionally increasing structural complexity.
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 design results in a compact, high-performance wide-angle lens with excellent optical characteristics, corrected aberrations, and a low F-number, enabling better image quality and night shooting capabilities.
Implementation Method 1
a first lens with a positive refractive power, a second lens with a negative refractive power, a third lens with a positive refractive power, a fourth lens with a negative refractive power, a fifth lens with a positive refractive power, and a sixth lens with a negative refractive power
Data Source
AI summary
The present invention discloses a wide angle lens. The wide angle lens comprises, from an object side in sequence: a first lens with a positive refractive power, a second lens with a negative refractive power, a third lens with a positive refractive power, a fourth lens with a negative refractive power, a fifth lens with a positive refractive power, and a sixth lens with a negative refractive power. The wide angel lens further satisfies specific conditions: 0.80f1/f1.50, −0.50f2/f3−0.05, 1.15d1/d91.40 and T56min/d110.50. The wide angle lens can achieve a high performance while obtaining a low TTL.