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 fewer lenses.
Innovation Solution
A compact optical image capturing system utilizing a seven-piece optical lens configuration with refractive powers, convex and concave surfaces, and inflection points to optimize light intake and correct aberrations, including spherical and coma aberrations, while maintaining a compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of lenses is reduced to achieve a compact form factor, then the device size is minimized, but the light intake and imaging quality deteriorate
Solution Approach 1:
The optical system is divided into seven distinct lens elements with specific refractive powers and surface configurations. Each lens element (first through seventh lenses) performs specific optical functions, allowing the system to achieve compact size while maintaining adequate light intake through optimized segmentation of optical tasks across multiple elements.
Solution Approach 2:
Different lens surfaces are designed with specific local properties: convex and concave surfaces are strategically positioned, inflection points are introduced on specific surfaces (particularly the sixth and seventh lenses), and each surface has tailored curvature radii. This local optimization allows light intake and aberration control without increasing overall device volume.
2Illumination intensity
If the aperture is enlarged to increase light intake, then the quantity of light entering the lens is improved, but the device complexity and size increase
Solution Approach 1:
The system optimizes specific parameters including the focal lengths of individual lenses (f1 through f7), the ratio of focal length to entrance pupil diameter (0.5 ≤ f/HEP ≤ 1.8), and the profile curve lengths relative to entrance pupil diameter (0.9 ≤ 2(ARE/HEP) ≤ 2.0). These parameter optimizations enable effective light intake with controlled aperture size, avoiding excessive system complexity.
Solution Approach 2:
The lens surfaces utilize spherical and aspherical curvatures with specific radius ratios (e.g., |R1/R2| between 0.001 and 20 for the first lens). The incorporation of inflection points on lens surfaces creates optimized curvature profiles that enhance light gathering efficiency without requiring larger aperture openings, thus controlling device complexity.
3Volume of moving object
If conventional lens configurations are used to achieve compact size, then the device form factor is minimized, but imaging quality and aberration correction deteriorate
Solution Approach 1:
The optical system employs asymmetric lens configurations where the sixth and seventh lenses specifically incorporate inflection points on their surfaces. The focal lengths and surface curvatures are asymmetrically distributed (e.g., the first lens has negative refractive power while subsequent lenses have positive power). This asymmetric design enables effective aberration correction and high imaging quality within a compact form factor.
Solution Approach 2:
The system utilizes sophisticated surface curvatures including spherical and aspherical surfaces with inflection points. Specific radius of curvature ratios are maintained (e.g., R3/R4 between -10 and 10 for the third lens). These curvature optimizations correct spherical and coma aberrations while maintaining compact dimensions, achieving high manufacturing precision without increasing system size.
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 enhances image quality and light intake, effectively reducing aberrations and achieving high imaging performance in low-light conditions, suitable for minimized 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 having refractive powers in order 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 power. The seventh lens has negative refractive power, 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.