Five-Lens Optical System with Inflection Point 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 distortion, especially in low-light conditions, due to the need for a large aperture and high pixel density, which complicates manufacturing and performance.
Innovation Solution
A compact optical image capturing system utilizing a five-piece optical lens configuration with specific refractive powers and aspheric surfaces to optimize light entry, reduce aberration, and enhance image quality, including a fifth lens with inflection points to adjust incident angles and correct distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to improve low-light performance, then light intake is improved, but aberration increases and image quality deteriorates
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 controlling light paths differently, allowing the system to maintain large aperture while correcting aberrations through the combined effect of segmented components rather than relying on a single complex lens
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, including the fifth lens element which has an inflection point on its image-side surface. These curved surfaces are specifically designed to redirect light rays and correct spherical aberration, enabling large aperture operation while maintaining image quality at the periphery
2Illumination intensity
If the aperture is increased to improve low-light performance, then light intake is improved, but image quality at periphery deteriorates
Solution Approach 1:
Different regions of the optical system are designed with different properties: the fifth lens element specifically has an inflection point on its image-side surface to control peripheral light rays, while other lens elements have different curvature configurations. This localized optimization ensures that peripheral image quality is maintained even with large aperture
Solution Approach 2:
Aspheric surfaces are implemented on multiple lens elements to specifically address peripheral ray control. The inflection point on the fifth lens element's image-side surface is particularly effective at redirecting peripheral light rays to reduce distortion and maintain sharpness at the image periphery
3Manufacturing precision
If the lens configuration is optimized for high pixels and high image quality, then imaging performance is improved, but device size increases
Solution Approach 1:
The patent utilizes the fifth lens element with an inflection point on its image-side surface to introduce additional optical power in a compact configuration. This dimensional change in surface geometry allows achieving high image quality without proportionally increasing the overall optical path length and device size
Solution Approach 2:
The optical system is segmented into five lens elements with specific refractive power distributions. This segmentation allows each element to contribute efficiently to image quality while keeping individual element sizes and spacing compact, preventing overall device size from becoming excessive
4Adaptability or versatility
If wide-angle design is used to increase field of view, then angle of view is improved, but distortion increases
Solution Approach 1:
The aspheric surfaces, particularly the inflection point on the fifth lens element's image-side surface, are designed to control the angular distribution of light rays across the field of view. This curvature design redistributes ray paths to maintain geometric accuracy and reduce distortion even at wide angles
Solution Approach 2:
The five-lens configuration with specific refractive power distribution allows different lens elements to handle different angular ranges. This segmentation enables the system to achieve wide field of view while each element contributes to correcting distortion in its respective angular zone
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, improves imaging quality, and reduces size and weight while maintaining high optical performance, suitable for high-pixel and high-quality image capture in compact electronic devices.
Implementation Method 1
use combination of refractive powers, convex and concave surfaces of five-piece optical lenses to increase the quantity of incoming light
Implementation Method 2
both the object-side surface and the image-side surface of the fifth lens are aspheric surfaces... the fifth lens is provided with an inflection point at the object-side surface or at the image-side surface to adjust the incident angle of each view field
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, include 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.