Eight-Lens Camera Optical Lens Aberration Correction
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Solution Overview
Problem
Current camera lenses with an eight-piece structure face challenges in achieving high optical performance while meeting the requirements for ultra-thin, wide-angle lenses with a big aperture, 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, achieving ultra-thin, wide-angle lenses with a big aperture by optimizing the distribution of refractive power and lens thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an eight-piece lens structure is used to improve optical performance, then imaging quality is improved, but lens thickness and complexity increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices of specific lenses (1.55≤n3≤1.70, 1.60≤n4≤1.80, 1.70≤n5≤1.90) and establishing specific focal length ratios (1.90≤f1/f≤3.00, f2≤0.00) to optimize the eight-piece lens structure. These parameter optimizations enable the complex lens system to achieve high optical performance while managing the inherent complexity through scientific parameter selection.
2Length of moving object
If lens refractive power and spacing are optimized to achieve ultra-thin profile, then lens thickness is reduced, but optical performance may deteriorate
Solution Approach 1:
The patent applies local quality by assigning different refractive index ranges to different lens elements (n3: 1.55-1.70, n4: 1.60-1.80, n5: 1.70-1.90) rather than using uniform materials. This allows each lens position to be optimized locally for its specific optical function, enabling ultra-thin overall design while maintaining high optical performance through differentiated material properties at each location.
3Illumination intensity
If aperture is increased to improve light gathering capability, then imaging quality is improved, but lens complexity and difficulty of aberration correction increase
Solution Approach 1:
The patent applies segmentation by dividing the aperture control function across multiple lens elements with different refractive powers and properties. The eight-piece structure with varying refractive indices (including negative focal length elements like f2≤0.00) segments the optical correction tasks, allowing each element to contribute to aberration correction while collectively enabling a large aperture design.
4Adaptability or versatility
If wide-angle capability is increased to expand field of view, then functionality is improved, but distortion and aberration correction becomes more difficult
Solution Approach 1:
The patent applies composite materials by combining multiple lens elements with different refractive index ranges (n3: 1.55-1.70, n4: 1.60-1.80, n5: 1.70-1.90) to create a composite optical system. This composite structure enables wide-angle capability while the diverse material properties of different elements work together to correct distortion and aberrations that would be difficult to correct in a single-element or uniform-material system.
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 high optical performance and a large aperture, making it suitable for mobile phone and webcam lenses with high pixel imaging elements, while maintaining an ultra-thin profile and correcting on-axis and off-axis aberrations.
Implementation Method 1
a third lens, a fourth lens; 1.55≤n3≤1.70; 1.60≤n4≤1.80; f2≤0.00
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: 1.90≤f1/f≤3.00; f2≤0.00; and 1.55≤n3≤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 n3 denotes a refractive index of the third lens. The present disclosure can achieve high optical performance while achieving ultra-thin, wide-angle lenses having a big aperture.