Eight-Lens Optical Imaging System for Thin Mobile Camera Aperture
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Solution Overview
Problem
The challenge is to design an optical imaging lens for mobile phones that is both thin and lightweight while maintaining a large aperture and image-side surface area, capable of handling various shooting environments effectively.
Innovation Solution
The optical imaging lens is composed of eight lenses with a specific arrangement of refractive powers and curvature radii, optimized to balance aberrations and enhance imaging quality, featuring a combination of positive and negative refractive powers, aspherical surfaces, and carefully controlled focal lengths and thicknesses to achieve a compact, high-quality imaging system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the optical imaging lens is made thin and lightweight, then the portability is improved, but the aperture and image-side surface area are reduced
Solution Approach 1:
The optical imaging lens is divided into eight separate lens elements with alternating positive and negative refractive powers. This segmentation allows each element to contribute differently to the overall optical function, enabling the system to maintain a large effective imaging surface while keeping the total thickness compact. The divided structure optimizes light path control without requiring a single large thick lens.
Solution Approach 2:
The eight lens elements are arranged in a nested sequence along the optical axis, with each element positioned to optimize the light path. The alternating positive and negative power elements are nested to correct aberrations while maintaining a compact overall form factor, allowing the system to achieve large aperture and imaging surface area within a thin profile.
2Length of moving object
If the optical imaging lens is made thin and lightweight, then the portability is improved, but the light collection capability is reduced
Solution Approach 1:
The optical imaging lens employs asymmetric design in the curvature radii and thicknesses of the eight lens elements. The object-side and image-side surfaces of each element have different curvature characteristics, optimized to maximize light collection efficiency. This asymmetric configuration allows the thin lens system to effectively capture and focus light without requiring increased thickness.
Solution Approach 2:
The patent optimizes specific parameters including the curvature radii (R1-R16), thicknesses (CT1-CT8), and spacing (T12-T78) of the eight lens elements. By carefully adjusting these parameters, the system achieves enhanced light collection capability within a thin profile. The alternating positive and negative refractive powers are parameter-optimized to minimize aberrations while maximizing aperture efficiency.
3Manufacturing precision
If multiple lenses with complex configuration are used, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The optical imaging lens merges multiple optical functions into a single integrated eight-element system. The alternating positive and negative power elements are combined to simultaneously achieve aberration correction, focal length control, and compact form factor. This merging approach maintains high imaging quality while avoiding the need for separate correction lenses or complex mechanical adjustment mechanisms.
Solution Approach 2:
The patent utilizes aspherical surfaces on selected lens elements to correct optical aberrations more effectively than spherical surfaces alone. The aspherical curvature profiles are optimized to reduce spherical aberration, coma, and astigmatism, thereby improving imaging quality. This curvature optimization allows the system to achieve high precision imaging without increasing the number of lens elements or overall complexity.
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
This configuration results in an optical imaging lens that achieves excellent imaging quality in both long and close shots, with improved light collection, reduced sensitivity, and a larger imaging surface, meeting the requirements of portability and high pixel density.
Implementation Method 1
an optical imaging lens, which sequentially includes, from an object side to an image side along an optical axis, a first lens with refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with refractive power, a fifth lens with refractive power, a sixth lens with refractive power, a seventh lens with refractive power and an eighth lens with negative refractive power
Data Source
AI summary
The disclosure discloses an optical imaging lens, which sequentially includes, from an object side to an image side along an optical axis, a first lens with refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with refractive power, a fifth lens with refractive power, a sixth lens with refractive power, a seventh lens with refractive power and an eighth lens with negative refractive power. A distance on the optical axis from an object-side surface of the first lens to an imaging surface of the optical imaging lens TTL, ImgH is a half of diagonal length of an effective pixel region on the imaging surface of the optical imaging lens, ImgH and an Entrance Pupil Diameter (EPD) of the optical imaging lens meet TTL/(EPD×ImgH)<0.5 mm−1.