7-Element Camera Lens Aberration Correction via Segmentation
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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, particularly for handheld devices like smartphones and digital cameras, where the shrinking pixel size of photosensitive devices and increasing demand for high imaging quality require advanced lens designs.
Innovation Solution
A 7-piece camera optical lens structure is designed, with specific conditions for the focal lengths, refractive indices, and curvature radii of each lens to achieve ultra-thin and wide-angle capabilities while correcting aberrations, including a combination of plastic and glass materials and careful optimization of lens powers and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens pieces is increased to improve imaging quality, then chromatic aberration correction and imaging performance are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The lens is divided into seven distinct lens pieces with specific optical powers and material properties. Each lens piece is optimized for specific aberration correction, with the second, fourth, and sixth lenses being negative meniscus lenses and the first, third, fifth, and seventh lenses being positive meniscus lenses. This segmentation allows comprehensive correction of chromatic and spherical aberrations while maintaining a manageable structural complexity through systematic arrangement.
Solution Approach 2:
The patent employs composite material construction with at least two different types of optical glass materials (having different Abbe numbers and refractive indices) and plastic materials. Specifically, the second lens uses glass with Abbe number 20-40, the fourth lens uses glass with Abbe number 50-70, and other lenses use plastic materials. This composite approach enables effective chromatic aberration correction across different wavelength ranges while managing the complexity through material property optimization.
2Length of moving object
If the lens is designed to be ultra-thin to meet device miniaturization requirements, then device size is reduced, but optical performance and aberration correction become more difficult to achieve
Solution Approach 1:
The patent optimizes multiple critical parameters simultaneously: the total optical length is constrained to 5.0mm or less, the focal length is set between 2.0mm-4.0mm, and specific focal length ratios are established (f2/f between -2.5 to -1.5, f3/f between 1.5 to 2.5, f4/f between 2.0 to 4.0). The curvature radii and thicknesses of individual lenses are precisely controlled, with the second lens having specific curvature radius ratios (R3+R4)/(R3-R4) between 4.0-8.0. These parameter optimizations enable ultra-thin design while maintaining superior optical performance and comprehensive aberration correction.
3Adaptability or versatility
If the focal length is shortened to achieve wide-angle capability, then field of view is expanded, but optical aberrations and imaging quality deteriorate
Solution Approach 1:
The patent employs dynamic optical power distribution across the seven lens pieces, with alternating positive and negative meniscus lenses. The negative meniscus lenses (second, fourth, sixth) and positive meniscus lenses (first, third, fifth, seventh) create a dynamic balance that corrects spherical and chromatic aberrations while maintaining wide-angle capability. The focal length ratios between adjacent lenses are dynamically optimized to control off-axis ray paths and minimize distortion across the wide field of view.
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 lens with high performance, low Total Optical Length (TTL), and excellent imaging quality, maintaining miniaturization characteristics with fully corrected on-axis and off-axis chromatic aberrations, suitable for diverse user demands and technological advancements.
Implementation Method 1
from the object side to the image side, the camera optical lens comprises in sequence: an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The camera optical lens further satisfies specific conditions.