Five-Lens Optical System with Inflection Points for Aberration Control
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Solution Overview
Problem
Conventional optical systems for portable electronic devices face challenges such as large aberration, poor image quality at the periphery, and difficulty in manufacturing due to the need for a large aperture, while also requiring high pixels, high image quality, and a wide angle of view.
Innovation Solution
A compact optical image capturing system using a combination of five-piece optical lenses with specific refractive powers and aspheric surfaces to increase light intake and improve imaging quality, featuring a fifth lens with inflection points to adjust incident angles and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to improve light intake, then the quantity of light entering the lens is increased, but large aberration and poor image quality at periphery occur
Solution Approach 1:
The optical system is divided into five separate lens elements with different refractive powers and surface curvatures. Each lens element contributes to correcting specific types of aberrations, allowing the system to maintain large aperture for light intake while controlling overall aberration through coordinated design of multiple segments.
Solution Approach 2:
Different regions of the optical system are assigned different functions: the first lens element with positive refractive power captures and focuses light, while subsequent elements with varying refractive powers (positive and negative) are positioned to correct specific aberrations in different field regions, achieving local optimization of image quality across the entire field.
2Illumination intensity
If the aperture is increased to improve light intake, then the quantity of light entering the lens is increased, but manufacturing difficulty increases
Solution Approach 1:
The system uses five discrete lens elements that can be manufactured separately using standard optical manufacturing processes, then assembled together. This segmentation allows each element to be optimized for specific requirements while simplifying individual manufacturing compared to a single large-aperture element.
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element (refractive power, surface curvature, thickness, material properties) that balance optical performance with manufacturability. These parameter optimizations enable large aperture design while keeping manufacturing complexity manageable through standardized production approaches.
3Adaptability or versatility
If a wide-angle design is used to increase field of view, then the angle of field is increased, but large distortion occurs
Solution Approach 1:
The wide-angle field of view is achieved by distributing the angular coverage across multiple lens elements, each handling a portion of the field. This segmentation allows progressive correction of distortion throughout the field rather than attempting to correct all distortion in a single element.
Solution Approach 2:
Different lens elements are designed with specific surface curvatures and refractive powers optimized for correcting distortion in their respective field regions. The combination of these locally optimized elements achieves overall distortion control across the entire wide-angle field of view.
4Manufacturing precision
If high pixels are implemented to improve image resolution, then imaging quality is improved, but the system size increases
Solution Approach 1:
The patent optimizes parameters such as focal length, lens element spacing, and aperture size to achieve high imaging quality suitable for high-pixel sensors while constraining the overall system dimensions. The compact arrangement of five lens elements with carefully controlled spacing enables high resolution without proportionally increasing system volume.
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 light intake and image quality, reduces size, and corrects aberrations, enabling high-resolution imaging with improved peripheral performance and manufacturing efficiency.
Implementation Method 1
an optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens from an object side to an image side along an optical axis
Data Source
AI summary
A five-piece optical lens for capturing image and a five-piece optical module for capturing image, along the optical axis in order from an object side to an image side, including a first lens with positive refractive power having an object-side surface which can be convex; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power; and a fifth lens which can have negative refractive power, wherein an image-side surface thereof can be concave, and at least one surface of the fifth lens has an inflection point; both surfaces of each of the five lenses are aspheric. The optical lens can increase aperture value and improve the imaging quality for use in compact cameras.