Four-Lens Optical System with Aspheric Surfaces for Aberration Control
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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 miniaturization while managing aberrations and distortion, especially with large aperture and wide view angle designs.
Innovation Solution
The optical image capturing system employs a combination of refractive powers and aspheric surfaces in four-piece optical lenses to increase light intake and view angle, incorporating inflection points on lens surfaces for aberration correction and improved imaging quality, with specific lens element parameters optimized for compact design and high pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If large aperture design is used to increase light intake, then quantity of incoming light is improved, but aberration increases resulting in deterioration of peripheral image quality
Solution Approach 1:
The optical system is divided into four separate lens elements with different refractive powers. The first lens element has positive refractive power and the second, third, and fourth lens elements have negative refractive power. This segmentation allows each element to contribute differently to light gathering and aberration correction, enabling large aperture design while maintaining peripheral image quality through coordinated action of multiple elements.
Solution Approach 2:
Different regions of the optical system are assigned different functional properties. The first lens element focuses on light gathering with positive refractive power, while the second, third, and fourth elements focus on aberration correction with negative refractive power. This local differentiation of optical functions allows the system to simultaneously achieve large aperture for light intake and precise control over peripheral image quality.
2Area of moving object
If wide view angle design is used to increase field of view, then view angle is improved, but distortion rate increases resulting in deterioration of image formation quality
Solution Approach 1:
The optical system uses four segmented lens elements where the first element with positive refractive power contributes to wide view angle, while the second, third, and fourth elements with negative refractive power are specifically configured to correct distortion. This segmentation enables the system to achieve wide view angle without sacrificing image formation quality.
Solution Approach 2:
The patent employs aspheric surfaces with inflection points on the second, third, and fourth lens elements. These parameter changes in surface geometry allow for precise control of light paths, enabling wide view angle design while maintaining low distortion rates and high image formation quality through mathematical optimization of surface curvatures.
3Volume of moving object
If miniaturization is pursued to reduce device size, then device compactness is improved, but complexity of optical design increases to maintain imaging quality
Solution Approach 1:
The optical system is miniaturized by dividing it into four compact lens elements arranged in sequence. Each element has a specific refractive power configuration (positive for first element, negative for second, third, and fourth elements) that allows for compact spacing while maintaining effective optical performance. This segmentation enables miniaturization without proportionally increasing design complexity.
Solution Approach 2:
The use of aspheric surfaces with inflection points on multiple lens elements provides additional degrees of freedom for optimization. These parameter changes in surface geometry allow for compact lens element designs that maintain high imaging quality, reducing the need for larger spacing between elements and enabling overall system miniaturization.
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 optical and TV distortion, and supports ultra-high pixel density, enabling efficient light management and miniaturization, suitable for high-resolution applications like 4K or UHD video recording.
Implementation Method 1
an optical image capturing system, in 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, sequentially including a first lens element, a second lens element, a third lens element and a fourth lens element from an object side to an image side, is provided. The first lens element has positive refractive power. The second through third lens elements have refractive power. The fourth lens element has negative refractive power. At least one of the image side surface and the object side surface of each of the four lens elements are aspheric. The optical lens elements can increase aperture value and improve the imagining quality for use in compact cameras.