7-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 fully corrected chromatic aberration for handheld devices, as existing miniature camera lenses struggle to achieve high imaging quality due to limitations in lens structures and material properties.
Innovation Solution
A 7-lens camera optical lens design is proposed, with specific focal length and refractive index ratios, curvature radii, and thickness conditions for each lens, made of glass and plastic materials, to achieve ultra-thin and wide-angle capabilities while correcting aberrations, including spherical and chromatic aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional three-piece or four-piece lens structure is used, then manufacturing complexity is reduced, but imaging quality deteriorates due to inability to fully correct chromatic aberration
Solution Approach 1:
The lens system is divided into seven individual lens elements with alternating positive and negative refractive powers. This segmentation allows each lens to be optimized for specific aberration correction, particularly chromatic aberration, while maintaining overall system performance. The division into multiple elements enables better control of light paths and reduction of optical defects.
Solution Approach 2:
The patent employs composite lens结构设计 combining glass and plastic materials with different refractive indices and Abbe numbers. By strategically selecting materials with complementary optical properties, the system achieves superior chromatic aberration correction. The combination of high-refractive-index glass elements and plastic elements creates synergistic effects for aberration management.
2Length of moving object
If lens thickness is reduced to achieve ultra-thin design, then miniaturization is improved, but optical performance deteriorates due to insufficient aberration correction capability
Solution Approach 1:
The patent systematically optimizes multiple parameters including focal lengths, curvature radii, thicknesses, and material properties to achieve the desired balance. Specific parameter relationships are established, such as the focal length ratio between the first and second lenses (0.3 < |f1/f2| < 1.5), and the Abbe number difference between positive and negative lenses (10 < vp-vn < 50), enabling ultra-thin design with maintained optical performance.
Solution Approach 2:
The patent addresses the thickness limitation by optimizing the lateral distribution of optical power across the seven lens elements. Instead of concentrating correction in a single thick element, the aberration correction is distributed across multiple thinner elements arranged in sequence, achieving both miniaturization and performance through spatial distribution of optical functions.
3Adaptability or versatility
If wide-angle capability is increased, then field of view is improved, but distortion and other aberrations worsen
Solution Approach 1:
The patent employs asymmetric lens designs and varying curvature profiles across the lens elements to dynamically adapt to wide-angle light paths. The curvature radii and thicknesses are specifically optimized to handle oblique incident rays characteristic of wide-angle applications, maintaining aberration control across the expanded field of view.
Solution Approach 2:
Different regions of the lens system are optimized for different functions: the first two positive-power lenses are optimized for field curvature and distortion control, while the alternating negative-power lenses in the middle are optimized for chromatic aberration correction. This localized optimization enables wide-angle capability while maintaining image quality across the entire field.
4Length of moving object
If pixel size of photosensitive device is reduced, then device miniaturization is improved, but imaging quality deteriorates due to reduced light gathering capability
Solution Approach 1:
The lens system performs preliminary correction of chromatic and spherical aberrations before light reaches the photosensitive device. By pre-correcting these aberrations in the optical path, the system ensures that even small pixels receive optimized light bundles, maximizing their light-gathering efficiency and maintaining imaging quality despite miniaturization.
Solution Approach 2:
The patent replaces reliance on large pixel size (mechanical dimension) with optimized optical design (optical system) to achieve light gathering. Through precise control of refraction and focal properties across seven elements, the system compensates for reduced pixel area, maintaining imaging quality through optical rather than physical means.
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 results in a camera lens with excellent optical characteristics, achieving ultra-thinness, wide-angle capabilities, and full correction of on-axis and off-axis chromatic aberrations, enhancing imaging quality and miniaturization characteristics.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 are provided from an object side to an image side in this order
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 made of a glass material; a second lens made of a plastic material; a third lens made of a glass material; a fourth lens made of a plastic material; a fifth lens made of a plastic material; a sixth lens made of a plastic material; and a seventh lens made of a plastic material. The camera optical lens satisfies following conditions: 1.51≤f1/f≤2.50; 1.70≤n1≤2.20; 0.50≤f3/f4≤2.00; −10.00≤(R13+R14)/(R13−R14)≤10.00; and 1.70≤n3≤2.20. The camera optical lens can achieve a high imaging performance while obtaining a low TTL.