Seven-Lens Camera Optics for Wide-Angle Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is an urgent need for a miniaturized camera optical lens with excellent optical characteristics such as large aperture, wide-angle, ultra-thinness, and sufficient aberration correction to meet the demands of modern electronic devices with reduced pixel size and improved imaging quality.
Innovation Solution
A seven-lens structure camera optical lens design is proposed, with specific relational expressions defining the focal lengths, curvature radii, refractive powers, and material properties of each lens to achieve aberration correction, large aperture, and ultra-thinness, including lenses made of glass and plastic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-lens structure is used to improve imaging quality, then optical performance is improved, but device complexity increases
Solution Approach 1:
The optical lens system is divided into seven independent lens elements with specific refractive powers and curvature radii. Each lens element (first lens L1 through seventh lens L7) is designed with specific optical parameters to correct different types of aberrations, allowing the complex imaging function to be segmented across multiple simpler components that work together to achieve superior optical performance
Solution Approach 2:
Different lens elements are assigned different local optical properties including positive and negative refractive powers, varying curvature radii (R1 through R14), and specific Abbe numbers (v1 through v7). The third lens specifically uses high refractive index material (nd3≥1.66) with appropriate Abbe number range to correct chromatic aberrations locally, while other lenses have tailored properties to address specific aberration types in their respective zones of the optical system
2Volume of moving object
If the pixel size of the optical sensor is reduced to achieve miniaturization, then device size is reduced, but imaging quality deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for all seven lens elements including focal lengths (f1 through f7), curvature radii (R1 through R14), thicknesses (d1 through d7), and material properties (refractive indices nd1 through nd7 and Abbe numbers v1 through v7). These parameter changes are optimized to maintain excellent aberration correction and imaging quality despite the reduced overall optical length TTL, enabling miniaturization without sacrificing performance
Solution Approach 2:
The optical system employs a dynamic balance of positive and negative refractive powers across the seven lens elements. The first and second lenses have negative refractive powers, while the third through seventh lenses have positive refractive powers, creating a dynamic optical system that can effectively control light paths and correct aberrations in a compact configuration
3Adaptability or versatility
If a wide-angle design is implemented to increase field of view, then FOV is increased, but aberration correction becomes more difficult
Solution Approach 1:
The wide-angle field of view (FOV≥197°) is achieved by segmenting the optical power distribution across seven lens elements rather than concentrating it in fewer elements. This segmentation allows each lens to handle a portion of the wide angular field while maintaining control over ray angles, thereby correcting aberrations more effectively across the entire wide field of view
Solution Approach 2:
The patent employs asymmetric surface curvatures with specific radius ratios (0.30≤R1/R2≤2.00, 0.20≤R3/R4≤0.80, 0.90≤R5/R6≤1.40) to optimize off-axis ray control. The asymmetric design of lens surfaces, particularly the first lens with convex object side and concave image side, helps correct coma and astigmatism across the wide field of view while maintaining the overall symmetric seven-lens structure
4Illumination intensity
If the aperture is enlarged to improve light gathering, then light transmission is improved, but depth of field is reduced and aberrations increase
Solution Approach 1:
The patent optimizes the local quality of each lens element to handle the increased light angles from the large aperture (Fno≤1.10). The first lens with negative refractive power and specific curvature ratio (0.75≤(R1+R2)/(R1-R2)≤2.64) is specifically designed to control spherical aberration at large apertures, while the third lens with high refractive index material addresses chromatic aberrations, allowing the system to maintain aberration control despite the large aperture
Solution Approach 2:
The optical system performs preliminary aberration correction in the early lens elements (first and second lenses with negative refractive powers) before light reaches the later elements. This preliminary action of correcting spherical and chromatic aberrations early in the optical path allows the subsequent lenses to build upon this corrected base, maintaining overall aberration control even with the large aperture configuration
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 camera optical lens achieves excellent optical performance with sufficient aberration correction, large aperture, and ultra-thinness, making it suitable for mobile phone camera lenses, web camera lenses, and vehicle-mounted lenses.
Implementation Method 1
a first lens L1 having negative refractive power, a second lens L2 having negative refractive power, a third lens L3 having refractive power, a fourth lens L4 having positive refractive power, a fifth lens L5 having positive refractive power, a sixth lens L6 having positive refractive power, and a seventh lens L7 having negative refractive power
Data Source
AI summary
A camera optical lens sequentially includes seven lenses: a first lens having negative refractive power, a second lens having negative refractive power, a third lens having refractive power, a fourth lens having positive refractive power, a fifth lens having positive refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power. Following relational expressions are satisfied: 1.50≤f4/f5≤3.40; 0.90≤R5/R6≤1.40; 170≤FOV/Fno≤200. The camera optical lens according to the present disclosure has excellent optical characteristics of sufficient aberration correction, large aperture, wide-angle and ultra-thinness, and is particularly suitable for a mobile phone camera lens assembly and a WEB camera lens which are composed of camera elements such as CCD, CMOS with high definition, and a vehicle-mounted lens.