Six-Lens Camera Optical Lens Aberration Correction
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Solution Overview
Problem
There is a need for ultra-thin, wide-angle camera lenses with good optical characteristics and large apertures to meet the increasing demand for high-quality imaging in miniature camera systems, particularly in handheld devices like smartphones and digital cameras, where traditional lens structures struggle to correct aberrations and maintain miniaturization.
Innovation Solution
A six-piece camera optical lens design is proposed, with specific refractive power and curvature radius conditions for each lens element, including a plastic material composition and aspherical surface coefficients, to achieve ultra-thin and wide-angle performance while correcting aberrations and maintaining a low total optical length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-piece or four-piece lens structure is used, then the lens can be manufactured with simpler processes, but the imaging quality and aberration correction are insufficient
Solution Approach 1:
The lens system is divided into six independent lens elements, each with specific refractive power and surface curvature characteristics. This segmentation allows each element to correct specific types of aberrations (spherical, coma, astigmatism, field curvature, distortion, chromatic aberration) while collectively achieving superior imaging quality that cannot be obtained with fewer elements.
Solution Approach 2:
The patent employs composite lens structures combining different materials with distinct refractive indices and Abbe numbers. Specifically, it uses high-refractive-index materials for certain elements to enhance light bending capability while controlling chromatic aberration, and low-dispersion materials for others to minimize color fringing. This composite approach enables effective aberration correction across the visible spectrum.
2Length of moving object
If the lens is miniaturized for handheld devices, then the device size is reduced, but the total optical length and imaging performance deteriorate
Solution Approach 1:
The six lens elements are arranged in a compact nested configuration along the optical axis, with each element positioned closely to its neighbors. This nesting approach minimizes the total optical length while maintaining the necessary spacing for effective aberration correction. The compact arrangement allows the lens system to achieve ultra-thin form factor suitable for handheld devices without sacrificing imaging quality.
Solution Approach 2:
The patent utilizes extreme parameter values for certain lens elements, including very high refractive indices (1.7-2.0) and specific surface curvature ratios (R3/d3 between 20-40). These parameter optimizations enable each element to achieve maximum optical power within minimal thickness, thereby reducing the total optical length while maintaining effective aberration correction capabilities.
3Manufacturing precision
If the aperture is increased for better light gathering, then the imaging quality improves, but the lens complexity and difficulty of aberration correction increase
Solution Approach 1:
Each lens element is designed with locally optimized surface profiles and refractive power distribution tailored to its specific position in the optical train. The first element features a convex object-side surface with specific curvature to control spherical aberration at the aperture, while subsequent elements have progressively optimized surfaces to correct coma, astigmatism, and other off-axis aberrations. This local quality optimization allows the system to handle large aperture requirements without excessive complexity.
Solution Approach 2:
The patent employs aspherical surface profiles on multiple lens elements to efficiently correct spherical aberration and other monochromatic aberrations. The aspherical surfaces provide continuous curvature variation that cannot be achieved with simple spherical surfaces, enabling better control of light rays across the entire aperture. This curvature optimization reduces the need for additional corrective elements, managing system complexity while maintaining high imaging quality at large apertures.
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 high optical imaging performance with corrected aberrations, a wide field of view, and a large aperture, ensuring excellent imaging quality and miniaturization, as demonstrated by specific Embodiments 1, 2, and 3, which satisfy conditions for focal lengths, curvature ratios, and aspherical surface coefficients.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6... an object side surface of the first lens L1 is convex in a paraxial region, an image side surface of the first lens L1 is concave in the paraxial region... aspherical surface coefficients
Data Source
AI summary
The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens; a fifth lens; and a sixth lens. The camera optical lens satisfies following conditions: 1.50≤f1/f≤5.00; and 20.00≤R3/d3≤42.01. The camera optical lens can achieve a high imaging performance while satisfying a design requirement for ultra-thin, wide-angle camera lenses with large apertures.