Three-Lens Aspheric Optical System for Compact Imaging
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Solution Overview
Problem
Conventional optical lenses face challenges in achieving both miniaturization and high optical quality, particularly in meeting the requirements for small-sized and high-performance lenses for portable imaging devices like smartphones and cameras, where existing designs struggle to optimize focal lengths and aberrations effectively.
Innovation Solution
The proposed optical lens system consists of three aspheric lenses with specific focal length ratios and a diaphragm placement between the lenses, featuring a convexo-convex first lens, an image surface undercutting second lens, and a negative third lens, with at least one surface being aspheric, to break through traditional focal power distribution limitations and enhance optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional optical lens designs are used, then the lens can be miniaturized, but the optical quality deteriorates due to inability to effectively optimize focal lengths and aberrations
Solution Approach 1:
The optical lens is divided into three separate lens groups (first lens, second lens, third lens) with distinct focal power characteristics. This segmentation allows each lens group to be optimized independently for specific functions: the first lens provides positive focal power for light convergence, the second lens provides negative focal power for aberration correction, and the third lens provides additional positive focal power. This modular segmentation enables miniaturization while maintaining optical quality through specialized optimization of each segment.
Solution Approach 2:
Each lens group is assigned specific local optical properties: the first lens has positive focal power optimized for initial light convergence, the second lens has negative focal power specifically designed for correcting chromatic and spherical aberrations, and the third lens has positive focal power for final image formation. The aspheric surfaces are applied locally to specific lens groups where they provide the most benefit for aberration correction. This local quality differentiation allows the compact lens to achieve high optical performance.
2Reliability
If three aspheric lenses with specific focal length ratios are used, then optical quality improves by reducing aberrations, but the device complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the three lens groups to optimize optical performance while controlling complexity. The focal length ratios are constrained within specific ranges: 0.3 < f1/f2 < 1.5 and 0.5 < f2/f3 < 2.0, where f1, f2, and f3 are the focal lengths of the first, second, and third lenses respectively. These parameter constraints ensure effective aberration correction without requiring excessive complexity in the lens design. The aspheric coefficients are also defined within specific ranges to achieve optimal surface profiles.
Solution Approach 2:
The patent employs aspheric surfaces on one or more lens groups to correct spherical aberration and improve image quality. The aspheric profiles are defined by specific mathematical equations with constrained coefficient ranges, allowing the lens surfaces to deviate from perfect spheres in a controlled manner. This curvature modification enables effective aberration correction in a compact configuration without requiring an excessive number of lens elements, thus balancing optical quality with device complexity.
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 results in improved optical quality by reducing axial chromatic aberration, astigmatism, distortion, and chromatic difference of magnification, achieving better performance and specifications for compact imaging devices.
Implementation Method 1
The optical lens includes a first lens, a second lens, and a third lens, wherein the first lens is a convexo-convex lens with positive focal power, the second lens is an image surface undercutting lens with negative focal power, and the third lens is a lens with negative power
Implementation Method 2
at least one surface of the lenses is aspheric
Data Source
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AI summary
A micro-lens is provided. The micro-lens includes a first lens, a second lens and a third lens. The first lens is a convexo-convex lens with positive focal power; the second lens is a lens having a concave image-side surface with negative focal power; and the third lens is a lens with negative focal power. At least one surface of the first, second and third lenses is aspheric. The micro-optical lens provided herein employs three pieces of aspheric lens, and breaks through the current patent blockage through distribution of different focal power, and set forth a new solution for the specification and performance as required currently. Meanwhile, the optical lens disclosed in this invention has small size and high optical quality, and thus could be easily installed in various digital products requiring portable imaging.