Four-Lens Optical System Aberration Correction
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Solution Overview
Problem
Miniaturization and lightweight trends in mobile communications terminals pose challenges for implementing camera modules with high resolution and performance, limiting the ability to achieve optimal optical performance.
Innovation Solution
An optical system comprising four lenses with specific refractive powers and meniscus shapes, including a first lens with negative refractive power and convex object-side surface, a second lens with positive refractive power and convex surfaces, a third lens with positive or negative refractive power and convex image-side surface, and a fourth lens with positive refractive power and convex object-side surface, optimized with aspherical surfaces to improve aberration correction and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lenses are formed of plastic and configured with five or more lenses to achieve high resolution, then manufacturing cost and device complexity increase
Solution Approach 1:
The patent merges multiple lens functions into a four-lens configuration where each lens performs multiple optical corrections. The first lens (negative power) and fourth lens (positive power) both have meniscus shapes that contribute to both aberration correction and field of view expansion, reducing the total lens count while maintaining high resolution
Solution Approach 2:
The patent optimizes specific parameter ranges for each lens including refractive power ratios (e.g., -2.0 < f1/f < 0.5), curvature radii relationships (e.g., r1/r2 > 0.5), and aspherical coefficients. These parameter optimizations enable high resolution with fewer lenses by maximizing the optical efficiency of each component
2Volume of moving object
If mobile communications terminals are miniaturized and lightened, then camera module size is reduced but optical performance deteriorates
Solution Approach 1:
The patent employs aspherical surfaces on multiple lenses with specific coefficient ranges (e.g., -1.0 < K1 < 0.5 for the first lens). These curved surfaces enable compact lens spacing and efficient light path control, achieving high resolution in a miniaturized form factor without requiring larger optical components
Solution Approach 2:
The patent arranges lenses in a compact nested configuration where the second lens (positive power) and third lens (positive or negative power) are positioned closely between the first and fourth lenses. This nested layout minimizes the overall optical path length while maintaining sufficient working distance for high resolution imaging
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 optical system achieves a wide field of view and high resolution while reducing manufacturing costs and complexity, enhancing optical performance and aberration correction.
Implementation Method 1
a first lens having negative refractive power and having a meniscus shape of which an object-side surface is convex
Implementation Method 2
a second lens having positive refractive power
Implementation Method 3
a third lens having refractive power
Implementation Method 4
a fourth lens having positive refractive power and having a meniscus shape of which an object-side surface is convex
Data Source
AI summary
There is provided an optical system including: a first lens having negative refractive power and having a meniscus shape of which an object-side surface is convex; a second lens having positive refractive power; a third lens having refractive power; and a fourth lens having positive refractive power and having a meniscus shape of which an object-side surface is convex, wherein the first to fourth lenses are sequentially disposed from an object side, whereby an aberration improvement effect, a wide field of view and a high degree of resolution may be realized.