Six-Element Camera Lens Aberration Correction
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Solution Overview
Problem
Conventional six-piece camera lens structures for handheld devices face challenges in achieving high optical performance while satisfying design requirements for wide-angle and ultra-thin lenses with large apertures due to irrational refractive power settings, lens spacing, and shape, leading to issues with aberrations and imaging quality.
Innovation Solution
A six-piece camera optical lens design with specific refractive power and curvature radius conditions for each lens, including aspherical surfaces, to optimize refractive power distribution and correct aberrations, achieving a high optical performance and ultra-thin lens design with a large aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a six-piece lens structure is used to improve imaging quality, then optical performance is improved, but the lens cannot achieve high optical performance while satisfying design requirements for wide-angle and ultra-thin lenses with large apertures due to irrational refractive power settings and lens spacing
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the six lens elements, setting specific refractive power ratios (e.g., |f1/f|<1.5, |f2/f|>0.5) and curvature radius relationships (e.g., R1/R3 between 0.5-2.0). These parameter adjustments resolve the contradiction by making the lens structure rational while maintaining the six-piece configuration for high imaging quality.
2Adaptability or versatility
If the lens structure is optimized for wide-angle and large aperture, then field of view and light gathering ability are improved, but the lens length increases
Solution Approach 1:
The patent employs aspherical surfaces on multiple lens elements (including the first, third, and fifth lenses) to achieve wide-angle performance and large aperture without increasing lens length. The aspherical design allows for better light ray control and reduced aberrations, enabling a compact ultra-thin profile while maintaining 84 degrees or more field of view.
Solution Approach 2:
The six lens elements are arranged in a compact nested configuration with optimized spacing between elements. This nesting approach allows the lens system to achieve wide-angle and large aperture performance while keeping the total lens length minimized, creating an ultra-thin profile suitable for handheld devices.
3Reliability
If more lens elements are added to correct aberrations, then imaging quality is improved, but the lens becomes thicker and more complex
Solution Approach 1:
The patent applies local quality by assigning specific functions to different lens elements within the six-piece structure. Each lens element has optimized refractive power, curvature, and aspherical coefficients tailored to its position and role in correcting specific aberrations. This localized optimization allows effective aberration correction without increasing overall lens thickness.
Solution Approach 2:
The patent uses lens materials with different refractive indices and Abbe numbers (e.g., n1=1.544, v1=55.82 for the first lens; n2=1.661, v2=20.53 for the second lens) to correct chromatic and spherical aberrations. This composite material approach enables effective aberration correction while maintaining a compact ultra-thin lens design.
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 effectively corrects spherical aberrations and reduces the total length of the lens, achieving high imaging quality and a wide field of view, specifically 84 degrees or more, while maintaining a compact ultra-thin profile.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6... the first lens L1 has a positive refractive power, and has an object side surface being a convex surface and an image object surface being a concave surface
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: an aperture; a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power; and a sixth lens having a negative refractive power. The camera optical lens satisfies following conditions: 1.09≤n4/n1≤1.30; and −2.00≤(R1+R2)/(R1−R2)≤−1.50, where n1 denotes a refractive index of the first lens; n4 denotes a refractive index of the fourth lens; R1 denotes a curvature radius of an object side surface of the first lens; and R2 denotes a curvature radius of an image side surface of the first lens.