Four-Lens Optical System Aberration Correction
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Solution Overview
Problem
Traditional optical image capturing systems for portable electronic devices face challenges in achieving high pixels, improved imaging quality, and minimizing lens size while addressing aberrations and distortion issues, particularly with large aperture and wide view angle designs.
Innovation Solution
The optical image capturing system employs a combination of refractive powers and convex/concave surfaces in four-piece optical lenses to increase light intake and view angle, incorporating specific lens element parameters and inflection points to correct optical distortion and aberrations, allowing for miniaturization and high pixel imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture of the optical image capturing system is increased to improve light intake and imaging quality, then the quantity of incoming light is improved, but optical aberration increases resulting in deterioration of peripheral image formation quality
Solution Approach 1:
The optical system is divided into multiple lens elements (first through fourth lens elements) with different functions. The first lens element captures light and forms initial image, while subsequent lens elements progressively correct aberrations. This segmentation allows the system to handle large aperture light intake while distributing aberration correction across multiple components, preventing peripheral image deterioration.
Solution Approach 2:
Different lens elements are designed with specific local properties: the first lens element has positive refractive power for light gathering, the second has negative refractive power for aberration correction, the third has positive refractive power for focal adjustment, and the fourth has negative refractive power for final aberration compensation. Each lens element's specific curvature and material properties are optimized for its local function within the overall system.
2Area of moving object
If the view angle of the optical lenses is increased to improve imaging coverage, then the view angle is improved, but distortion rate in image formation increases
Solution Approach 1:
The optical system uses multiple lens elements arranged in sequence, where each element contributes to expanding the view angle while controlling distortion. The first lens element establishes the initial wide angle, and subsequent elements progressively adjust the optical path to maintain image geometry across the expanded field of view.
Solution Approach 2:
The lens elements employ asymmetric surface curvatures and refractive power distributions to counteract distortion effects. The object-side and image-side surfaces of each lens element have different curvature radii, and the refractive powers are strategically assigned to balance the optical path for off-axis rays, reducing barrel or pincushion distortion while maintaining wide view angle.
3Volume of moving object
If the optical system is miniaturized to reduce device size, then the device size is reduced, but the ability to correct aberrations and maintain imaging quality becomes more difficult
Solution Approach 1:
The optical system packs multiple lens elements into a compact arrangement where each lens element is positioned closely to the next. The fourth lens element is specifically positioned near the image plane, and the overall configuration allows the optical train to be nested within a minimized total track length while maintaining sufficient separation for aberration correction functions.
Solution Approach 2:
The system uses high refractive index materials and optimized curvature radii to achieve strong optical power in compact spaces. By changing material parameters (refractive index, Abbe number) and geometric parameters (curvature radii, thickness ratios), the system achieves effective aberration correction within a miniaturized form factor, avoiding the need for larger lens elements or increased spacing.
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 aberrations, and miniaturizes the optical system, enabling it to meet the demands of high pixel count and wide view angle requirements while maintaining manufacturing feasibility.
Implementation Method 1
The optical image capturing system employs a combination of refractive powers and convex/concave surfaces of four-piece optical lenses
Data Source
AI summary
A four-piece optical lens for capturing image and a five-piece optical module for capturing image are provided. In the order from an object side to an image side, the optical lens along the optical axis includes a first lens with positive refractive power; a second lens with refractive power; a third lens with refractive power; and a fourth lens with refractive power; and at least one of the image-side surface and object-side surface of each of the four lens elements are aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.