Six-Lens Optical System Aberration Correction
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Solution Overview
Problem
Traditional optical image capturing systems in portable electronic devices face challenges in achieving high resolution, large aperture, and wide-angle capabilities while minimizing aberrations and size, particularly in meeting the demands for higher pixel counts and improved imaging quality.
Innovation Solution
The optical image capturing system employs a combination of six-piece optical lenses with specific refractive powers and aspheric surfaces to increase light intake, view angle, and pixel count, incorporating a sixth lens element with negative refractive power and inflection points to correct aberrations and maintain miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture value is increased to improve light intake and imaging quality, then the incoming light quantity increases, but the system produces more optical aberrations resulting in worse image quality
Solution Approach 1:
The optical system is divided into six separate lens elements instead of using a single lens or fewer elements. Each lens element can be independently designed and optimized to control specific types of aberrations while contributing to the overall light gathering capability. This segmentation allows the system to achieve large aperture while correcting aberrations through the combined effect of multiple elements.
Solution Approach 2:
Different lens elements are assigned different refractive powers (positive and negative) and specific surface curvatures to address local optical quality issues. The sixth lens element with negative refractive power is specifically designed to correct aberrations introduced by the earlier positive-power elements, while each element's aspheric surfaces are optimized for local ray control.
2Adaptability or versatility
If the view angle is enlarged to improve wide-angle imaging capability, then the field of view increases, but the system experiences increased distortion
Solution Approach 1:
Aspheric surfaces are employed on multiple lens elements instead of traditional spherical surfaces. The aspheric profiles allow for better control of off-axis rays and enable the system to achieve wide viewing angles while minimizing barrel or pincushion distortion that typically plagues wide-angle optical systems.
Solution Approach 2:
The sixth lens element with negative refractive power serves multiple functions: it corrects distortion across the wide field of view, controls the chief rays from off-axis objects, and contributes to the overall focal length management. This multi-functional design allows a single element to address multiple optical quality issues simultaneously.
3Object-affected harmful factors
If more optical elements are added to improve imaging quality and correct aberrations, then the optical performance improves, but the system size increases
Solution Approach 1:
The six lens elements are arranged in a compact configuration where each element is positioned closely to the others along the optical axis. The system design allows the elements to be nested within a minimal total track length, with careful optimization of air gaps and element thicknesses to reduce overall system size while maintaining the necessary optical power distribution for aberration correction.
Solution Approach 2:
The patent employs specific parameter relationships to compact the system: the ratio of focal lengths between positive and negative power elements is controlled, the refractive indices and Abbe numbers of the lens materials are selected to achieve high correction efficiency in smaller form factors, and the surface curvatures are optimized to provide strong aberration correction with minimal element thickness.
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
This configuration enhances imaging quality, corrects optical and TV distortions, and allows for the integration of more optical elements, enabling high-resolution, wide-angle imaging in compact devices with reduced size and aberrations.
Implementation Method 1
Optical image capturing system, optical image capturing lens... six-piece optical lenses... refractive powers... convex and concave surfaces
Data Source
AI summary
An optical image capturing system, from an object side to an image side, comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The first lens element has a positive refractive power and may have a convex object-side surface. The second through fifth lens elements has a refractive power and the object-side and image-side surfaces of these lens elements are aspheric. The sixth lens element has a negative refractive power and a concave image-side surface. The object-side surface and the image-side surface are aspheric, and at least one of the two surfaces has inflection points. The first through sixth lens elements has a refractive power. When specific conditions are satisfied, the optical image capturing system may has a large aperture value and a better optical path adjusting ability to acquire better imaging quality.