Seven-Lens Camera Optical Lens Design for Aberration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current camera optical lenses for handheld devices face challenges in achieving high optical performance while meeting the requirements for ultra-thin, wide-angle lenses with large apertures, due to irrational refractive power, lens spacing, and lens shape settings.
Innovation Solution
A seven-piece camera optical lens design is proposed, with specific refractive power and curvature radius conditions for each lens, including a first lens with positive refractive power, followed by lenses with negative and positive refractive powers, optimized to satisfy conditions such as 0.85≤f1/f≤1.00 and 3.00≤R7/d7≤7.00, which improves optical performance and corrects aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a seven-piece lens structure is used to improve imaging quality, then optical performance is improved, but the lens structure cannot achieve high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvature radii, and thicknesses of each lens element. Specifically, it sets the refractive powers of the seven lenses in sequence as +−−+−+− and establishes precise mathematical relationships between parameters (e.g., 0.85≤f1/f≤1.00, 1.50≤f3/f2≤5.00, 3.00≤R7/d7≤7.00) to achieve ultra-thin, wide-angle, large-aperture performance while maintaining high imaging quality
Solution Approach 2:
The patent segments the optical system into seven distinct lens elements with alternating refractive powers. This segmentation allows each lens element to be independently optimized for specific functions: the first lens (positive) for light gathering, the second and third lenses (negative) for aberration correction, the fourth lens (positive) for focal length control, the fifth lens (negative) for distortion correction, the sixth lens (positive) for aperture control, and the seventh lens (negative) for field curvature correction
2Length of moving object
If the lens structure is optimized for ultra-thin and wide-angle requirements, then compactness and field of view are improved, but optical performance deteriorates due to irrational refractive power and lens shape settings
Solution Approach 1:
The patent resolves this contradiction by establishing precise parameter relationships that balance thickness and optical performance. It sets the curvature radius R7 of the object-side surface of the fourth lens and its on-axis thickness d7 to satisfy 3.00≤R7/d7≤7.00, which optimizes the lens shape for both ultra-thin requirements and optical quality. Similarly, it sets 0.85≤f1/f≤1.00 for the first lens focal length ratio and 1.50≤f3/f2≤5.00 for the third and second lens focal length ratios to achieve wide-angle performance with maintained optical quality
3Use of energy by moving object
If the lens structure is optimized for large aperture, then light gathering ability is improved, but aberration control becomes more difficult
Solution Approach 1:
The patent segments the aberration correction function across multiple lens elements. The second lens (negative) and third lens (negative) work together to correct spherical and chromatic aberrations introduced by the first lens's large aperture. The fifth lens (negative) and seventh lens (negative) further correct off-axis aberrations and field curvature, enabling large aperture (Fno=1.66) with controlled aberrations
Solution Approach 2:
The patent uses parameter changes to balance aperture and aberration control by setting specific focal length ratios and curvature relationships. The condition 1.50≤f3/f2≤5.00 ensures that the third lens effectively compensates for aberrations from the second lens, while the condition 3.00≤R7/d7≤7.00 optimizes the fourth lens shape to control coma and astigmatism at large aperture
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, making it suitable for high-pixel camera optical lens assemblies in mobile phones and web cameras, with improved imaging quality and reduced sensitivity, while maintaining an ultra-thin and wide-angle configuration.
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; a fifth lens having a negative refractive power; a sixth lens having a positive refractive power; and a seventh 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; a fifth lens having a negative refractive power; a sixth lens having a positive refractive power; and a seventh lens having a negative refractive power. The camera optical lens satisfies following conditions: 0.85≤f1/f≤1.00; 1.50≤f3/f2≤5.00; and 3.00≤R7/d7≤7.00. The camera optical lens can achieve high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures.