Seven-Lens Imaging Layout for Compact Aberration Correction
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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 applies parameter changes by precisely controlling the refractive indices (e.g., 1.5 < ν4 < 1.7 for the fourth lens) and Abbe numbers of each lens element, along with their relative positions and focal lengths, to achieve optimal aberration correction in a compact seven-lens configuration
Solution Approach 2:
The patent utilizes aspherical surfaces on multiple lens elements (first, second, third, fourth, fifth, sixth, and seventh lenses) to correct spherical aberration and other optical imperfections, allowing for compact design while maintaining high optical performance
2Illumination intensity
If the F-number is reduced to improve light gathering capability, then low-light performance is improved, but chromatic aberration and flare phenomena increase
Solution Approach 1:
The patent employs a composite lens system with seven different lens elements, each with specifically selected refractive indices and Abbe numbers (e.g., 20 < V1 < 40, 50 < V2 < 70), creating a multi-material optical system that corrects chromatic aberration while maintaining low F-number for improved light gathering
Solution Approach 2:
The patent converts the potential harm of high light gathering into benefit by using the increased light flux to improve signal-to-noise ratio, while simultaneously using the seven-lens design with specific refractive index combinations to correct the resulting chromatic aberration and reduce flare through strategic placement of high and low dispersion elements
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 compact cameras on wireless terminals.
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
Implementation Method 2
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.