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 balancing high pixel count, image quality, and miniaturization, while also effectively increasing light admission and angle of view, due to issues like aberration and distortion.
Innovation Solution
The system employs a combination of refractive powers and convex/concave surfaces in four-piece optical lenses with an embedded mechanism to adjust the angle of incidence, correcting optical and TV distortion, and enhancing imaging quality by optimizing lens parameters such as focal lengths, refractive indices, and surface geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to admit more light, then the light admission is improved, but the aberration increases resulting in deterioration of image quality
Solution Approach 1:
The optical system is divided into multiple lens elements (first, second, third, and fourth lens elements) with different functions. The first lens element handles light gathering, while subsequent elements correct aberrations. This segmentation allows the system to admit more light through a larger aperture while maintaining image quality through dedicated correction elements.
Solution Approach 2:
Different regions of the optical system are assigned different optical properties. The first lens element has specific curvature and refractive index characteristics for light gathering, while the second and third elements have tailored properties for aberration correction. This local optimization enables simultaneous improvement of light admission and image quality.
2Area of moving object
If the angle of view is increased to capture wider scenes, then the field of view is improved, but the distortion rate increases resulting in deterioration of image quality
Solution Approach 1:
The lens elements employ asymmetric surface designs with different curvatures on object-side and image-side surfaces. The fourth lens element specifically uses a concave image-side surface to counteract distortion effects. This asymmetric configuration enables wider angle of view while maintaining geometric accuracy and reducing distortion.
Solution Approach 2:
The patent utilizes curved surfaces with specific radius of curvature values for each lens element. The fourth lens element's concave image-side surface with a specific curvature radius is particularly effective in reducing distortion. This careful control of surface curvature enables wide angle of view while maintaining image quality.
3Manufacturing precision
If the pixel density is increased to achieve higher resolution, then the imaging quality is improved, but the aberration increases resulting in peripheral image deterioration
Solution Approach 1:
The patent optimizes multiple optical parameters including curvature radii, thicknesses, and refractive indices of lens elements. Specific parameter ranges are defined (e.g., curvature radius ratios, thickness ratios) to control aberration while supporting high pixel density. This parameter optimization enables high-resolution imaging with minimal aberration even at the periphery.
Solution Approach 2:
The second and third lens elements act as intermediary components between the first light-gathering element and the final image plane. These intermediate elements are specifically designed to correct aberrations generated by the first element and support high pixel density imaging by reducing peripheral distortion and maintaining focus accuracy.
4Volume of moving object
If the camera module is minimized for portable devices, then the device size is reduced, but the light admission and angle of view are limited
Solution Approach 1:
The optical system employs a compact nested arrangement where multiple lens elements are closely spaced with minimized air gaps. The total track length is reduced by optimizing the distance between lens elements and positioning the aperture stop strategically. This nested configuration enables small camera module size while maintaining adequate light admission through efficient optical path design.
Solution Approach 2:
The patent explores alternative optical path configurations that utilize three-dimensional space more efficiently. By adjusting the spatial arrangement of lens elements in multiple dimensions and optimizing their positions relative to each other, the system achieves compact form factor while preserving light-gathering capability and angle of view.
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 improves the optical image capturing system's ability to admit more light, increase the angle of view, and enhance imaging quality, achieving better pixel density and reduced aberration, suitable for high-resolution applications in minimized electronic devices.
Implementation Method 1
an optical image capturing system, in the order from an object side to an image side, includes a first, second, third and fourth lens elements with refractive power
Data Source
AI summary
An optical image capturing system is provided. In the order from an object side to an image side, the optical image capturing system 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 is aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.