Eight-Lens Camera Optical System Aberration Correction
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Solution Overview
Problem
Current miniature camera lenses with eight-piece structures face challenges in achieving high optical performance while satisfying requirements for ultra-thin, wide-angle lenses with large apertures, due to irrational settings in refractive power, lens spacing, and lens shape.
Innovation Solution
A camera optical lens design comprising eight lenses, with specific conditions for focal lengths, refractive indices, and curvature radii, balances spherical aberration and field curvature, and corrects off-axis aberrations, enabling high optical performance and a large aperture suitable for mobile phones and web cameras.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an eight-piece lens structure is used to improve imaging quality, then optical performance is improved, but the lens structure becomes too complex to achieve ultra-thin and wide-angle designs with large apertures
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the eight lenses, specifically setting the focal length ratios (f1/f, f2/f, f3/f) and refractive indices (n1, n2, n3, n6, n7) to specific ranges. This allows the complex eight-piece structure to achieve ultra-thin, wide-angle, large-aperture performance by precisely controlling optical parameters rather than simply reducing lens count.
2Ease of manufacture
If the lens structure is simplified to reduce complexity, then manufacturing becomes easier, but imaging quality deteriorates
Solution Approach 1:
The patent applies local quality by assigning different refractive power characteristics to different lens elements within the eight-piece structure. Each lens (L1-L8) has specifically optimized focal length ratios and refractive indices tailored to its position and function in the optical system, allowing the complex structure to be manufactured with precision while maintaining high imaging quality that simpler structures cannot achieve.
3Illumination intensity
If refractive power distribution is optimized to achieve large aperture, then light gathering ability improves, but aberrations increase
Solution Approach 1:
The patent converts the potential harm of increased aberrations from large aperture design into benefit by strategically using negative refractive power lenses (L2, L4, L5, L6, L8) to counterbalance the aberrations introduced by positive refractive power lenses (L1, L3, L7). The specific focal length ratios and refractive index ranges are designed to transform the aberration problem into an opportunity for superior aberration correction, achieving both large aperture and high imaging 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 design achieves ultra-thin, wide-angle lenses with high optical performance and a large aperture, effectively addressing the limitations of existing lens structures by optimizing the distribution of refractive power and reducing aberrations.
Implementation Method 1
n6 denotes a refractive index of the sixth lens
Data Source
AI summary
The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens. The camera optical lens satisfies following conditions: 5.00≤f1/f≤6.50; f2≤0; and 1.55≤n6≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n6 denotes a refractive index of the sixth lens. The present disclosure can achieve ultra-thin, wide-angle lenses having a big aperture.