Eight-Lens Camera Optical System for Wide-Angle Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional camera lenses for handheld devices face challenges in achieving high optical performance while maintaining ultra-thin, wide-angle capabilities with a big aperture, due to irrational settings in refractive power, lens spacing, and lens shape, particularly in eight-piece lens structures.
Innovation Solution
A camera optical lens design comprising eight lenses with specific refractive power distributions and curvature radii, optimized to balance spherical aberration and field curvature, achieving a focal length range and refractive index conditions that facilitate ultra-thin, wide-angle performance with a big aperture, suitable for high-pixel CCD or CMOS imaging elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional three-piece to six-piece lens structure is used, then the device complexity is reduced, but the optical performance deteriorates due to insufficient aberration correction
Solution Approach 1:
The patent divides the optical system into eight distinct lens elements with specific refractive power distributions (+-+--+--), where each lens element is optimized for specific aberration correction. This segmentation allows comprehensive correction of spherical aberration, coma, and field curvature that cannot be achieved with fewer elements.
2Adaptability or versatility
If the lens structure is designed for ultra-thin and wide-angle performance, then the adaptability improves, but the optical performance deteriorates due to irrational settings in refractive power and lens spacing
Solution Approach 1:
The patent optimizes specific parameters including the refractive powers of individual lenses (with the fourth and fifth lenses having negative refractive power), the spacing between lens elements, and the curvature radii of lens surfaces. These parameter changes enable the lens to achieve both ultra-thin profile and wide-angle performance while maintaining high optical quality through proper correction of optical aberrations.
3Illumination intensity
If the aperture is increased for big aperture performance, then the illumination intensity improves, but the optical performance deteriorates due to increased spherical aberration and field curvature
Solution Approach 1:
The patent applies local quality by assigning different refractive power characteristics to different regions of the optical system. Specifically, the fourth and fifth lenses have negative refractive power to counteract the spherical aberration introduced by the large aperture, while other lenses have positive refractive power for focusing. This localized optimization of optical properties across different lens elements enables big aperture performance with controlled aberrations.
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 with ultra-thin, wide-angle lenses having a big aperture, effectively correcting on-axis and off-axis aberrations, and maintaining miniaturization characteristics, suitable for mobile phone and web camera lenses.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8... the first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power
Data Source
AI summary
Provided is a camera optical lens, which includes, from an object side to an image side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a negative refractive power; a sixth lens having a negative refractive power; a seventh lens having a positive refractive power; and an eighth lens having a negative refractive power. The camera optical lens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0.00; and 1.55≤n5≤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 n5 denotes a refractive index of the fifth lens. The present disclosure can achieve high optical performance while achieving ultra-thin, wide-angle lenses having a big aperture.