Camera Optical Lens Aberration Control via Refractive Power Ratios
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Solution Overview
Problem
Conventional camera optical lenses for handheld devices face challenges in achieving high optical performance while meeting the requirements for ultra-thin, wide-angle lenses, due to irrational refractive power, lens spacing, and lens shape settings.
Innovation Solution
A camera optical lens design comprising four lenses with specific refractive power and curvature radius ratios, and on-axis thickness conditions, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth 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 traditional three-piece or four-piece lens structure is adopted to improve imaging quality, then optical performance is improved, but the lens cannot achieve ultra-thin and wide-angle requirements
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvature radii, and thicknesses of each lens element according to specific mathematical relationships. The four-piece lens structure uses precisely controlled parameters (e.g., refractive power ratios, curvature radius ratios) to achieve ultra-thin profile while maintaining wide-angle imaging quality, resolving the contradiction between traditional lens thickness and modern ultra-thin requirements
2Length of moving object
If the pixel area of photosensitive devices is reduced to meet thinner device requirements, then device thickness is reduced, but imaging quality requirements become more stringent
Solution Approach 1:
The patent segments the optical system into four distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to be optimized for specific functions (correcting aberrations, controlling light paths), enabling the system to maintain high imaging quality despite reduced overall thickness and smaller photosensitive device areas
3Adaptability or versatility
If refractive power, lens spacing, and lens shape settings are optimized for wide-angle, then wide-angle capability is improved, but optical performance deteriorates due to irrational settings
Solution Approach 1:
The patent creates a composite optical system by combining four lens elements with different refractive powers and material properties. The alternating positive and negative power elements work together as a composite structure, where each element compensates for the aberrations introduced by others, achieving both wide-angle capability and high optical performance simultaneously
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 excellent optical performance, ensuring ultra-thin and wide-angle capabilities, making it suitable for high-pixel camera optical lens assemblies in mobile phones and web cameras, with improved imaging quality and reduced sensitivity.
Implementation Method 1
a first lens L1 having a positive refractive power
Implementation Method 2
a second lens L2 having a negative refractive power
Implementation Method 3
a third lens L3 having a positive refractive power
Implementation Method 4
a fourth lens L4 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 positive refractive power; and a fourth lens having a negative refractive power. The camera optical lens satisfies following conditions: −0.75≤f1/f2≤−0.67; 0.32≤f4/f2≤0.40; 5.00≤R7/R8≤6.00; and 1.40≤d1/d2≤3.20, where f1, f2, and f4 denote focal lengths of the first, second and fourth lenses, respectively; R7 and R8 denote curvature radiuses of an object side surface and an image side surface of the fourth lens, respectively; d1 denotes an on-axis thickness of the first lens; and d2 denotes an on-axis distance from an image side surface of the first lens to an object side surface of the second lens. The camera optical lens can achieve high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses.