Four-Element Optical Image System Aberration Control
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Solution Overview
Problem
Conventional compact optical image systems, such as those with three-element or four-element lens structures, fail to produce high-quality images due to limitations in refractive power distribution and manufacturing complexity, particularly in portable electronic devices.
Innovation Solution
An optical image system comprising a specific arrangement of four lens elements with controlled refractive powers and surface curvatures, including a first lens with positive refractive power, a second with positive refractive power, a third with negative refractive power and a concave/convex surface, and a fourth with refractive power, optimized to reduce total track length and correct aberrations, allowing for improved image quality and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a three-element lens structure is used to achieve compact size, then the total track length is reduced, but image quality deteriorates due to insufficient degrees of freedom in parameter optimization
Solution Approach 1:
The patent divides the optical system into four distinct lens elements with specific refractive power assignments (first: positive, second: positive, third: negative, fourth: positive). This segmentation allows independent optimization of each element's parameters, providing sufficient degrees of freedom to control various aberrations while maintaining a compact total track length that would be unachievable with only three elements.
2Manufacturing precision
If glass spherical lens elements are attached to form a doublet lens to eliminate chromatic aberration, then chromatic aberration is corrected, but the manufacturing process becomes difficult and total optical track length increases
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element, including refractive power ratios (0.3 < f/f1 < 1.5, 0.1 < f/f2 < 0.6), curvature radius relationships (0.5 < -R1/R2 < 2.0), and thickness ratios (0.2 < CT1/CT2 < 1.0). These parameter constraints enable chromatic aberration correction through optimized refractive power distribution across plastic lens elements, eliminating the need for complex glass doublet attachment processes while controlling total optical track length.
3Manufacturing precision
If more spherical lenses are allocated to achieve better image quality, then aberration correction improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent employs four plastic lens elements with specifically controlled refractive indices and Abbe numbers. By using plastic materials with optimized optical properties and combining them in a four-element configuration with defined positive-negative-positive refractive power distribution, the system achieves superior aberration correction comparable to or exceeding glass lens systems, while reducing manufacturing complexity and enabling mass production through injection molding techniques.
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 achieves enhanced image quality, reduced total track length, and simplified manufacturing by optimizing refractive power distribution and surface curvatures, making it suitable for lightweight and portable electronic products.
Implementation Method 1
a first lens element (110), a second lens element (120), a third lens element (130) and a fourth lens element (140)... The first lens element with positive refractive power has a convex object-side surface
Implementation Method 2
The second lens element with positive refractive power
Implementation Method 3
The third lens element with negative refractive power has a concave object-side surface and a convex image-side surface
Implementation Method 4
The fourth lens element with refractive power has a concave image-side surface
Data Source
AI summary
An optical image system includes, in order from an object side to an image side, a first lens element with positive refractive power and having a convex object-side surface, a second lens element with positive refractive power, a third lens element with negative refractive power and having a concave object-side surface and a convex image-side surface, and a fourth lens element with refractive power and having a concave image-side surface. By such an arrangement, the total track length and photosensitivity of the image capturing lens assembly can be effectively reduced while retaining a high image quality.