Compact Seven-Lens Optical Imaging With Low F No.
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mobile terminals face challenges in achieving high-performance cameras due to space limitations, necessitating an optical imaging system that enhances camera performance without increasing size.
Innovation Solution
An optical imaging system comprising seven lenses, including specific configurations such as convex and concave surfaces, inflection points, and spacer placements, to optimize focal lengths and diameters, ensuring high performance within compact dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve imaging performance, then aberration correction and image quality are improved, but the overall system length and complexity increase
Solution Approach 1:
The patent employs a compact seven-lens configuration where lenses are densely arranged along the optical axis with minimized spacing. The conditional expressions ensure that the total track length remains controlled while achieving high imaging performance through optimized lens placement and spacing ratios.
Solution Approach 2:
The patent utilizes aspherical surfaces on multiple lenses with specifically optimized curvature radii and conic constants. The conditional expressions define precise parameter ranges for focal lengths, spacing, and surface curvatures to achieve aberration correction within a compact form factor.
2Illumination intensity
If the aperture is increased to improve light gathering capability, then F No. is reduced and imaging performance is improved, but lens diameter and system size increase
Solution Approach 1:
The patent achieves F No. less than 1.7 through optimized lens diameters and focal length ratios. The conditional expressions control the relationship between aperture diameters and focal lengths to achieve low F No. without proportionally increasing overall system size.
Solution Approach 2:
The patent employs aspherical surfaces on multiple lenses to optimize light path control and reduce aberrations. The aspherical coefficients and curvature variations enable efficient light gathering with controlled aperture sizes, achieving low F No. without excessive lens diameters.
3Length of moving object
If the distance from object to imaging plane is reduced to make the system more compact, then mobile terminal integration is improved, but aberration correction becomes more difficult
Solution Approach 1:
The patent achieves a compact object-to-imaging-plane distance of 6.0mm or less through dense lens stacking and minimized air gaps. The conditional expressions ensure that despite the short track length, sufficient optical power distribution is maintained for effective aberration correction.
Solution Approach 2:
The patent uses aspherical surfaces with optimized conic constants and higher-order coefficients to correct aberrations in the compact configuration. The conditional expressions define parameter ranges that maintain aberration correction effectiveness despite the reduced overall system length.
4Measurement precision
If aspherical surfaces are added to correct aberrations, then imaging performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies aspherical surfaces to specific lenses (first, second, third, sixth, and seventh lenses) with optimized conic constants and higher-order coefficients. The conditional expressions control the distribution and strength of aspherical terms to achieve necessary aberration correction while limiting the number of aspherical elements to manage manufacturing 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
The system achieves an F No. less than 1.7 and satisfies various conditional expressions for aberration correction, enabling high-performance imaging within a compact form factor suitable for mobile terminals.
Implementation Method 1
An optical imaging 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 in numerical order along an optical axis
Data Source
AI summary
An optical imaging 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 in numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system, wherein the optical imaging system satisfies 1<|f134567−f|/f, where f134567 is a composite focal length of the first to seventh lenses calculated with an index of refraction of the second lens set to 1.0, f is an overall focal length of the optical imaging system, and f134567 and f are expressed in a same unit of measurement.