Seven-Lens Imaging Optics With Refractive-Power Layouts for Miniaturization
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Solution Overview
Problem
Compact cameras mounted on wireless terminals face challenges in achieving high performance due to size constraints, necessitating an imaging lens system that enhances performance without increasing the camera's size.
Innovation Solution
An imaging lens system comprising seven lenses with specific refractive indices, Abbe numbers, and shapes, including aspherical surfaces, to optimize optical performance and minimize size, with an F-number of 2.0 or less, and satisfying various conditional expressions for refractive powers and distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lenses is increased to improve optical performance, then aberration correction is improved, but the overall size of the imaging system increases
Solution Approach 1:
The patent implements a compact seven-lens imaging system where lenses are nested closely together with minimized spacing. The lenses are arranged in a dense configuration where the total track length is kept compact by optimizing the distance between adjacent lenses, effectively nesting multiple optical elements within a limited space envelope.
Solution Approach 2:
The patent employs specific parameter ranges for each lens including refractive indices (e.g., 1.5<V1<1.7, 1.6<V2<1.8), Abbe numbers (e.g., 20<V1<40, 20<V2<30), and focal length ratios (e.g., -0.5<f1/f0<0.3, -0.3<f2/f0<-0.1) to optimize the balance between optical performance and compact size. These parameter constraints enable high-performance aberration correction within a reduced form factor.
2Illumination intensity
If the F-number is reduced to improve light gathering capability, then low-light performance is improved, but lens complexity and size increase
Solution Approach 1:
The patent achieves an F-number of 2.0 or less (specifically F<2.0) by optimizing the aperture diameter to focal length ratio while carefully controlling the refractive indices and shapes of all seven lenses. This parameter optimization enables enhanced light gathering capability without proportionally increasing system complexity, as the complexity is managed through systematic design constraints on each lens element.
3Length of moving object
If the total track length is reduced for miniaturization, then device size is reduced, but optical performance deteriorates
Solution Approach 1:
The patent maintains excellent optical performance in a compact form by enforcing specific parameter ranges: focal length ratios (e.g., f3/f<2.0, f4/f<-1.5), refractive indices (e.g., 1.5<V1<1.7, refractive index of fourth lens>1.6), and Abbe numbers (e.g., 20<V1<40). These constraints ensure that even with reduced total track length, the lens system achieves proper aberration correction and image quality.
Solution Approach 2:
The patent achieves miniaturization by nesting seven lens elements in a compact arrangement with minimized spacing between elements. The total track length is reduced through optimized lens positioning and spacing, while maintaining the necessary optical path length for proper image formation and aberration correction.
4Reliability
If chromatic aberration is corrected by adding more lens elements, then color accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent corrects chromatic aberration by selecting lenses with specific refractive indices (e.g., 1.5<V1<1.7, 1.6<V2<1.8) and Abbe numbers (e.g., 20<V1<40, 20<V2<30). These parameter specifications enable effective dispersion control and color correction while maintaining manufacturability, as the ranges are practical for standard optical materials rather than requiring exotic or difficult-to-source substances.
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 system achieves improved optical performance and miniaturization, effectively correcting aberrations and reducing chromatic and flare phenomena, suitable for portable devices.
Implementation Method 1
An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, sequentially disposed at intervals from an object side of the imaging lens system
Data Source
AI summary
An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, sequentially disposed at intervals from an object side of the imaging lens system. The imaging lens system satisfies 1.5<Nd5<1.6, 30<V5<50, and TTL/2IH<0.730, where Nd5 is a refractive index of the fifth lens, V5 is an Abbe number of the fifth lens, TTL is a distance from an object side surface of the first lens to an imaging plane, and 2IH is a diagonal length of the imaging plane.