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 convex/concave surfaces in four-piece optical lenses to enhance light intake and view angle, incorporating inflection points on lens surfaces for aberration correction and improved imaging quality, suitable for miniaturized electronic products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If large aperture design is used to increase light intake, then imaging quality and pixel count improve, but aberration increases causing deterioration of peripheral image formation
Solution Approach 1:
The optical system is divided into four separate lens elements with distinct functions. The first lens element (positive power) handles light gathering, while the second (negative power) and third (positive power) elements work together to correct aberrations. This segmentation allows each element to be optimized for its specific function, managing the trade-off between aperture size and aberration control.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, changing the geometric parameters from traditional spherical shapes. This parameter change enables better control of light rays, particularly at the periphery, reducing aberrations while maintaining large aperture capabilities. The aspheric coefficients are specifically optimized to balance light intake with image quality across the entire field.
2Area of moving object
If wide view angle design is used to increase field of view, then view angle improves, but distortion rate increases causing deterioration of image formation
Solution Approach 1:
The four-lens configuration divides the optical function into specialized segments. The third lens element with positive refractive power and the fourth lens element with negative refractive power work in combination to control off-axis rays, enabling wide view angle while maintaining image formation quality through their coordinated optical paths.
Solution Approach 2:
Multiple lens elements incorporate aspheric surfaces with specifically designed curvatures. The object-side surface of the first lens element and the image-side surface of the second lens element both feature aspheric designs that control ray angles and reduce distortion, enabling wide field of view with acceptable distortion rates.
3Length of moving object
If miniaturization is pursued to reduce device size, then device dimensions decrease, but difficulty of manufacture increases
Solution Approach 1:
The optical system is segmented into four discrete lens elements that can be manufactured separately using standard precision molding techniques. This segmentation allows each element to be produced within achievable tolerances, then assembled into a compact configuration, balancing miniaturization with manufacturing feasibility.
Solution Approach 2:
The use of aspheric surfaces, while more complex than spherical surfaces, is achieved through modern injection molding technology. The aspheric designs enable compact form factor and corrected aberrations without requiring extremely tight tolerances that would make manufacturing prohibitively difficult.
4Measurement precision
If high pixel count is implemented to improve imaging quality, then resolution improves, but requirement for precise optical performance increases
Solution Approach 1:
The four-element design distributes optical functions across multiple components, with each element contributing to overall image quality. This segmentation allows the system to achieve high resolution performance through cumulative effect rather than requiring any single element to meet extremely stringent tolerances.
Solution Approach 2:
Aspheric surfaces on multiple lens elements provide superior control over light ray paths, enabling the system to deliver consistent high-quality images across the entire field of view. This reduces sensitivity to manufacturing variations and maintains performance with practical tolerances.
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 effectively increases pixel count and imaging quality, reduces aberrations, and minimizes the system's size, making it suitable for high-resolution applications in compact portable devices.
Implementation Method 1
an 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
A four-piece optical lens for capturing image and a five-piece optical module for capturing image are provided. In the order from an object side to an image side, the optical lens along the optical axis 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 are aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.