Seven-element Camera Lens Design for Aberration Correction
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Solution Overview
Problem
Current seven-piece lens structures for camera optical lenses in handheld devices face challenges in achieving optimal optical characteristics for large aperture, wide-angle, and ultra-thin designs due to improper lens distance and shape, leading to unsatisfactory aberration correction and imaging quality.
Innovation Solution
A seven-piece camera optical lens design with specific refractive power distributions and curvature radius ratios among its lenses, along with aspherical surface coefficients, is implemented to correct aberrations and achieve ultra-thin and wide-angle capabilities, ensuring improved imaging quality and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seven-piece lens structure is used to improve imaging quality, then optical characteristics are improved, but the lens distance and shape become improper for achieving large aperture, wide-angle, and ultra-thin design requirements
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratios between lenses (f1/f, f2/f, f3/f, f4/f, f5/f, f6/f within specific ranges), curvature radius ratios (R1/R2, R3/R4, R5/R6, R7/R8, R9/R10, R11/R12 within specific ranges), and thickness ratios (d1/TTL, d2/TTL, d3/TTL, d4/TTL, d5/TTL, d6/TTL within specific ranges) to achieve large aperture (Fno≤2.0), wide-angle (FOV≥80°), and ultra-thin design while maintaining excellent imaging quality with the seven-piece lens structure
2Volume of moving object
If the pixel size of photosensitive devices is reduced to achieve miniaturization, then device dimensions are reduced, but imaging quality requirements increase
Solution Approach 1:
The patent divides the optical system into seven distinct lens elements with specific refractive power distributions (positive, negative, and combined powers), where each lens element is optimized for specific aberration correction. This segmentation allows the system to maintain excellent imaging quality despite reduced overall size and smaller photosensitive device pixel dimensions
Solution Approach 2:
The patent employs aspherical surfaces on multiple lens elements (first lens object-side surface, second lens object-side and image-side surfaces, third lens object-side surface, fourth lens image-side surface, fifth lens object-side and image-side surfaces, sixth lens object-side surface) to correct spherical aberration and other distortions, enabling high imaging quality in a compact form factor suitable for miniaturized devices
3Ease of manufacture
If traditional three-piece or four-piece lens structures are used, then manufacturing is simpler, but imaging quality is insufficient for high-pixel photosensitive devices
Solution Approach 1:
The patent segments the optical system into seven lens elements with specific refractive power distributions, where each element targets specific aberration types. This segmentation provides the necessary degrees of freedom to correct multiple aberrations simultaneously, achieving imaging quality suitable for high-pixel photosensitive devices while maintaining reasonable manufacturing complexity through systematic design
4Length of moving object
If lens distance and shape are optimized for ultra-thin design, then device thickness is reduced, but aberration correction becomes insufficient
Solution Approach 1:
The patent employs aspherical surfaces on multiple lens elements to correct spherical aberration and other distortions that typically worsen in thin lens designs. The aspherical coefficients are specifically optimized to maintain aberration correction performance while enabling ultra-thin overall lens thickness
Solution Approach 2:
The patent optimizes the ratio of each lens thickness to total optical length (d1/TTL, d2/TTL, d3/TTL, d4/TTL, d5/TTL, d6/TTL within specific ranges) and curvature radius ratios to achieve ultra-thin design while maintaining proper aberration correction through coordinated parameter adjustments across all lens elements
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 with a wide field of view, effective aberration correction, and a compact form, making it suitable for high-pixel camera elements in mobile devices.
Implementation Method 1
a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a positive refractive power, a sixth lens L6 having a positive refractive power and a seventh lens L7 having a negative refractive power
Data Source
AI summary
The present disclosure relates to the technical field of optical lens and discloses a camera optical lens. The camera optical lens includes, 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, a fourth lens, a fifth lens having a positive 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: 1.70>f6/f≤5.00; −4.00≤R14/R13≤−1.00; −5.00≤f2/f≤−2.00; 1.00≤d8/d9≤2.00. The camera optical lens can achieve excellent optical characteristics with a large aperture, wide-angle, and being ultra-thin.