Seven-Lens Optical System Aberration Correction
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Solution Overview
Problem
Conventional optical systems in portable electronic devices face challenges in capturing high-quality images in low-light environments due to limited light intake and aberrations, particularly in compact designs with multiple lenses.
Innovation Solution
A compact optical image capturing system utilizing a combination of seven-piece optical lenses with refractive powers, convex and concave surfaces, and inflection points to optimize light intake and correct aberrations, allowing for improved imaging quality and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical systems use five or six lenses to provide high optical performance, then imaging quality is improved, but the system size and complexity increase
Solution Approach 1:
The optical system is divided into seven distinct lens elements with specific refractive powers and surface curvatures. Each lens element (first through seventh lenses) is independently designed with specific convex/concave surfaces to correct different types of aberrations, allowing the system to achieve high imaging quality while maintaining a manageable complexity through modular design
Solution Approach 2:
Different regions of the optical system are assigned different functional properties. The first lens has negative refractive power to correct specific aberrations, while the second lens has positive refractive power for focusing. Each subsequent lens element is designed with specific convex or concave surfaces tailored to correct local optical defects in that region of the optical path
2Illumination intensity
If the optical system uses a large aperture to increase light intake for dark environment photography, then light gathering capability is improved, but aberrations increase
Solution Approach 1:
The system maintains a large aperture (f/1.8) to maximize light intake while using precise control of lens parameters including refractive powers, surface curvatures, and axial thicknesses. The seventh lens specifically uses an inflection point on its image-side surface to correct aberrations that would normally worsen with large aperture, allowing the system to achieve both high light gathering capability and maintained optical performance
3Length of moving object
If the optical system is minimized in size for portable electronic devices, then compactness is improved, but light intake and imaging quality deteriorate
Solution Approach 1:
The optical system achieves compactness by nesting the seven lens elements in a tight axial arrangement with minimized spacing. The lens elements are positioned close to each other along the optical axis, with the seventh lens positioned near the image sensor, creating a nested configuration that minimizes the overall axial length while maintaining sufficient space for each element to perform its optical function
Solution Approach 2:
The system compensates for the reduced aperture size due to compactness by optimizing the angular distribution of light rays. The inflection point on the seventh lens and the specific curvature designs of all lens elements work together to efficiently guide oblique rays from the large field of view (90 degrees) to the image sensor, maximizing light utilization in the compact form factor
4Manufacturing precision
If the optical system uses seven-piece optical lenses with inflection points to correct aberrations, then imaging quality is improved, but manufacturing complexity increases
Solution Approach 1:
The system uses seven lens elements with specifically optimized parameters including refractive powers, surface curvatures, and axial thicknesses that satisfy defined mathematical relationships. These parameter optimizations allow the lenses to be manufactured using standard molding or grinding processes while achieving superior aberration correction, particularly through the inflection point design on the seventh lens that corrects distortion without requiring complex multi-element assemblies
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 effectively increases light intake and improves imaging quality, correcting aberrations while maintaining a compact form factor suitable for portable electronic devices.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in order along an optical axis from an object side to an image side
Data Source
AI summary
An optical image capturing system includes, along the optical axis in 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. At least one lens among the first to the sixth lenses has positive refractive force. The seventh lens can have negative refractive force, wherein both surfaces thereof are aspheric, and at least one surface thereof has an inflection point. The lenses in the optical image capturing system which have refractive power include the first to the seventh lenses. The optical image capturing system can increase aperture value and improve the imaging quality for use in compact cameras.