Three-Piece Optical Lens Aberration Correction
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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 manufacturing difficulties due to the need for large apertures and wide-angle lenses, which also suffer from distortion and limited light entry.
Innovation Solution
A compact optical image capturing system utilizing a three-piece optical lens configuration with refractive powers, convex and concave surfaces, and inflection points to adjust incident angles and modify aberrations, enhancing light entry and image quality while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large aperture is used to increase light entry, then the quantity of light entering the lens is improved, but aberration increases and image quality deteriorates
Solution Approach 1:
The optical system is divided into three separate lens elements (first lens with positive refractive power, second lens with negative refractive power, and third lens with positive refractive power) instead of using a single large aperture lens. This segmentation allows each lens element to contribute differently to light gathering and aberration correction, resolving the contradiction between light entry and image quality.
Solution Approach 2:
Each lens element is designed with specific local characteristics: the first lens has a convex object-side surface for light gathering, the second lens has concave surfaces for aberration correction, and the third lens has specific curvature radii optimized for different zones. This local optimization allows different parts of the optical system to serve different functions, simultaneously achieving high light entry and good image quality.
2Adaptability or versatility
If a wide-angle lens is used to increase field of view, then the angle of field is improved, but distortion increases
Solution Approach 1:
The wide-angle field of view is achieved through the combined effect of three lens elements rather than a single wide-angle element. The first lens provides the wide-angle capability, while the second and third lenses work together to correct the distortion that would otherwise be present, separating the field expansion function from the distortion correction function.
Solution Approach 2:
The lens elements are designed with asymmetric curvature radii and positions optimized for wide-angle performance. The object-side surface of the first lens is convex with a specific curvature radius, while the image-side surfaces have different curvature characteristics, creating an asymmetric optical path that achieves wide field of view with minimized distortion.
3Device complexity
If a two-piece lens configuration is used to simplify the system, then device complexity is reduced, but optical performance is insufficient
Solution Approach 1:
The optical system uses three lens elements instead of two, with each element having a specific function: the first element (positive power) for light gathering and initial focusing, the second element (negative power) for aberration correction, and the third element (positive power) for final image formation. This segmentation provides the additional degrees of freedom needed to achieve high optical performance while keeping each individual element relatively simple.
Solution Approach 2:
The system achieves improved optical performance by optimizing specific parameters of each lens element including curvature radii (R1, R2, R3, R4), thicknesses (d1, d2, d3), and refractive powers. These parameter changes allow precise control over aberrations and image quality without requiring complex mechanical structures or additional components.
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 entry, improves imaging quality, and corrects aberrations, achieving high optical performance with reduced size and complexity, suitable for high-pixel and high-image-quality applications in portable devices.
Implementation Method 1
An optical image capturing system is provided including a first lens, a second lens, a third lens, and an image plane, in order along an optical axis from an object side to an image side. The first lens has positive refractive power... The second lens has negative refractive power... The third lens has positive refractive power
Data Source
AI summary
A three-piece optical lens for capturing image and a three-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, wherein an object-side surface thereof can be convex; a second lens with refractive power; and a third lens with refractive power, wherein both surfaces of each of the aforementioned lenses can be 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 imagining quality for use in compact cameras.