Three-Lens Optical System with Aspheric Inflection Points
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Solution Overview
Problem
Conventional optical systems in portable electronic devices face challenges such as large aberration, poor image quality at the periphery, and manufacturing burdens due to large apertures, and wide-angle systems suffer from significant distortion, failing to provide high optical performance, especially in low-light environments.
Innovation Solution
A compact optical image capturing system utilizing a combination of refractive powers and aspheric surfaces in three-piece lenses, including inflection points on the third lens's surfaces, to optimize light entry and improve image quality, with specific lens parameters and configurations that control aberrations and enhance imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large aperture is used to increase light intake in dark environments, then the quantity of light entering the lens is improved, but aberration increases and image quality at the periphery deteriorates
Solution Approach 1:
The optical system is divided into three separate lens elements instead of using a single lens or two-piece configuration. Each lens element contributes to the overall light gathering capability while distributing the optical corrections across multiple components, allowing the system to maintain large aperture benefits while controlling aberrations through coordinated design of individual elements.
Solution Approach 2:
The patent employs aspheric surfaces with inflection points on specific lens elements (particularly the third lens) to provide localized optical corrections where needed. This allows different regions of the optical system to have optimized properties - the aspheric surfaces correct peripheral aberrations while the overall aperture remains large for light gathering.
2Area of moving object
If a wide-angle configuration is used to increase field of view, then the angle of field is improved, but distortion increases
Solution Approach 1:
The patent utilizes aspheric surfaces with inflection points on the lens elements, particularly the third lens, to control and correct distortion in wide-angle configurations. The curved aspheric surfaces are specifically designed to counteract the natural distortion tendencies of wide-angle optics, maintaining straight lines and accurate geometric relationships across the expanded field of view.
3Device complexity
If a two-piece lens configuration is used to simplify manufacturing, then device complexity is reduced, but optical performance deteriorates
Solution Approach 1:
The optical system is divided into three separate lens elements instead of using a single lens or two-piece configuration. Each lens element contributes to the overall light gathering capability while distributing the optical corrections across multiple components, allowing the system to maintain large aperture benefits while controlling aberrations through coordinated design of individual elements.
Solution Approach 2:
The patent combines different lens materials with varying refractive indices and dispersion properties in a three-element configuration. This composite approach allows each lens element to be optimized for specific functions - some elements may use high-index materials for compactness while others use materials with specific dispersion characteristics to correct chromatic and other aberrations, achieving superior optical performance through material diversity.
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 effectively increases light intake, reduces aberrations, and improves image quality across the field of view, achieving high optical performance in compact electronic devices while minimizing size and manufacturing complexity.
Implementation Method 1
Both the object-side surface and the image-side surface of the third lens are aspheric surfaces... the third lens has refractive power... to optimize light entry and improve image quality
Data Source
AI summary
The invention discloses a three-piece optical lens for capturing image and a three-piece optical module for capturing image, which include, along the optical axis in order from an object side to an image side, 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; two surfaces of each of the three lenses can be both aspheric. The third lens can have positive refractive power, wherein an image-side surface thereof can be concave, and both surfaces thereof are aspheric; at least one surface of the third lens has an inflection point. The optical lens can increase aperture value and improve the imaging quality for use in a compact camera.