Five-Element Camera Lens Aberration Correction
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Solution Overview
Problem
Current camera optical lenses for handheld devices face challenges in achieving high optical performance while meeting requirements for ultra-thin, wide-angle lenses with large apertures, due to irrational refractive power, lens spacing, and lens shape settings.
Innovation Solution
A five-piece camera optical lens design with specific refractive power and curvature radius conditions for each lens element, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power, optimized to balance spherical aberrations and achieve ultra-thin, wide-angle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common five-piece lens structure is used, then good optical performance is achieved, but the refractive power, lens spacing and lens shape settings are irrational and cannot satisfy design requirements for ultra-thin, wide-angle lenses having large apertures
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the five lens elements, specifically setting the refractive power of the first lens to 0.75-0.86 times the total focal length, the second lens to -0.20 to -0.30 times the first lens focal length, and so on. This systematic parameter adjustment enables the lens to achieve ultra-thin, wide-angle, large aperture performance while maintaining excellent optical quality.
Solution Approach 2:
The patent applies local quality by assigning different refractive power characteristics to different lens elements based on their specific positions and functions. Each lens element is designed with tailored refractive power to address specific optical aberrations, with the first lens providing positive refractive power for focal length contribution, the second and third lenses providing negative refractive power for aberration correction, and the fourth and fifth lenses providing positive and negative refractive power respectively for final optimization.
2Volume of moving object
If pixel size of photosensitive devices is reduced, then miniaturization is achieved, but imaging quality requirements become increasingly higher
Solution Approach 1:
The patent optimizes the refractive power parameters of each lens element to achieve excellent optical performance in a compact configuration. The specific refractive power ratios (f1/f=0.75-0.86, f1/f2=-0.20 to -0.30, etc.) are carefully selected to correct aberrations while maintaining a compact lens structure suitable for miniaturized pixel sizes in mobile devices.
3Ease of manufacture
If lens structure is simplified, then manufacturing is easier, but optical performance cannot achieve high standards for ultra-thin wide-angle lenses
Solution Approach 1:
The patent divides the optical system into five distinct lens elements, each with specific refractive power characteristics. This segmentation allows each element to be optimized independently for its specific function while collectively achieving the overall performance goals of ultra-thin, wide-angle, large aperture design with excellent optical 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 lens design achieves excellent optical performance, ensuring ultra-thin, wide-angle capabilities with large apertures, making it suitable for high-pixel camera assemblies in mobile phones and web cameras, effectively correcting aberrations and maintaining miniaturization.
Implementation Method 1
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; and a fifth lens having a negative refractive power
Data Source
AI summary
Provided is a camera optical lens including, sequentially 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 negative refractive power; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power. The camera optical lens satisfies following conditions: 0.75≤f1/f≤0.86; −0.30≤f1/f2≤−0.20; 1.30≤(f1+f4)/f≤1.50; −22.00≤(f2+f3+f5)/f≤−9.00; and 0.05≤d8/f≤0.08, where f denotes a focal length of the camera optical lens; f1, f2, f3, f4 and f5 denote focal lengths of the first, second, third, fourth, and fifth lenses, respectively; and d8 denotes an on-axis distance from an image side surface of the fourth lens to an object side surface of the fifth lens. The camera optical lens can achieve high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures.