Three-Piece Aspheric Lens System for Compact Camera Aberration Control
Find Innovative SolutionsGenerate Solutions
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, while also requiring high pixels, high image quality, and compact size.
Innovation Solution
The optical image capturing system employs a three-piece optical lens configuration with refractive powers, convex and concave surfaces, and inflection points on the third lens to increase light entry and improve imaging quality, incorporating aspheric surfaces and specific lens parameters to correct aberrations and enhance image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large aperture is used to increase light intake, 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 (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. Each lens element is optimized for specific functions: the first lens captures light, the second lens corrects aberrations, and the third lens further refines image quality. This segmentation allows the system to maintain large aperture for light intake while controlling aberration through distributed optical correction.
Solution Approach 2:
Different regions of the optical system are assigned different functional qualities. The first lens (object-side) is designed with positive refractive power optimized for light gathering, the second lens (middle) with negative refractive power optimized for aberration correction, and the third lens (image-side) with positive refractive power optimized for final image formation. Each lens element has specific surface curvature and thickness parameters tailored to its local function, allowing the overall system to achieve both high light intake and high image quality.
2Area of moving object
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 optical system is segmented into three lens elements with alternating positive and negative refractive powers. This segmentation allows the system to achieve a wide angle of field (50°<2ω≤70°) while distributing the distortion correction across multiple elements. The second lens with negative refractive power specifically counteracts the distortion introduced by the wide-angle first lens, and the third lens further refines the correction.
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element to control distortion while maintaining wide angle of field. The refractive powers, surface curvatures (R1, R2, R3, R4), and thickness parameters (d1, d2, d3) are optimized within specific ranges. Additionally, the patent employs aspheric surface parameters (A4, A6, A8, A10, A12, A14, A16, A18, A20) to precisely control ray paths and minimize distortion across the wide field of view.
3Manufacturing precision
If high pixels and high image quality are required, then imaging quality is improved, but the system size increases
Solution Approach 1:
The compact high-resolution optical system is divided into three lens elements with optimized individual functions. The first lens (positive power) captures light efficiently, the second lens (negative power) corrects aberrations, and the third lens (positive power) focuses light onto the image sensor. This segmentation allows each element to be optimized for high-resolution imaging while keeping individual element sizes small, resulting in a compact overall system suitable for portable devices with high pixel density sensors.
Solution Approach 2:
The patent specifies optimized parameter ranges for high-resolution imaging: focal length ratios (0.25<f1/f≤0.40, 0.30<f2/|f|≤0.50), surface curvature ratios (0.30<|R1/R2|<0.70, 0.30<|R3/R4|<0.70), and thickness ratios (0.20<d1/d3≤0.50, 0.30<d2/d3≤0.60). These parameter optimizations enable high imaging quality for high-pixel sensors while maintaining a compact form factor suitable for minimized electronic products.
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 light intake, reduces aberrations, and improves image quality, enabling high-resolution imaging with compact size and high optical performance suitable for minimized electronic devices.
Implementation Method 1
The first lens has positive refractive power
Implementation Method 2
The second lens has negative refractive power
Implementation Method 3
The third lens has positive refractive power
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 imagining quality for use in compact cameras.