Four-Element Optical Lens System Aberration Correction
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance between compact size, ease of assembly, high image quality, and telephoto effect while maintaining flexibility in design and material selection, particularly for small-angle-of-view applications.
Innovation Solution
An optical imaging lens system comprising four non-cemented lens elements with specific refractive powers and surface curvatures, including a first lens with positive power, a second with negative power, a third with balanced convex and concave surfaces, and a fourth with inflection points, optimized for focal length ratios and thickness ratios to achieve compactness and high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical systems are designed with small angle of view, then the design flexibility of lens shape and material is reduced, but the system can achieve compact size
Solution Approach 1:
The patent applies parameter changes by optimizing specific geometric parameters of the lens elements, including the curvature radii ratios (R1/R2, R3/R4), thickness ratios (CT1/CT2, CT3/CT4), and focal length ratios (f1/f, f2/f). These parameter optimizations enable the system to achieve both compact size and design flexibility simultaneously by finding the optimal balance point for each parameter within specified ranges.
2Volume of moving object
If conventional optical systems are designed to be compact, then it becomes difficult to simultaneously satisfy lens molding requirements, assembling ease, and low sensitivity
Solution Approach 1:
The patent specifies optimal parameter ranges that balance compactness with manufacturability. The curvature radius ratios (R1/R2 between 0.5-2.0, R3/R4 between 0.5-2.0), thickness ratios (CT1/CT2 between 0.3-1.5, CT3/CT4 between 0.3-1.5), and focal length ratios (f1/f between 0.2-0.8, f2/f between -0.5-0.2) are carefully selected to ensure lenses can be molded accurately and assembled easily while maintaining compact dimensions.
Solution Approach 2:
The patent incorporates feedback mechanisms through iterative optimization of the lens parameters. By establishing specific ratio ranges and constraints, the design allows for feedback during the manufacturing process to adjust and refine the lens parameters, ensuring that molding accuracy and assembly ease are maintained even in compact configurations.
3Manufacturing precision
If the fourth lens element has inflection points on its surfaces, then aberration correction is improved, but the surface complexity increases
Solution Approach 1:
The patent applies local quality by introducing inflection points at specific locations on the surfaces of the fourth lens element rather than uniformly complicating the entire surface. The inflection points are strategically positioned to correct specific aberrations (such as spherical and coma aberrations) while keeping other regions of the surface relatively simple, thus achieving aberration correction without excessive overall 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
The system effectively balances refractive power distribution, corrects aberrations, and maintains compactness, enabling wide application in electronic devices while improving image quality and telephoto effect.
Implementation Method 1
The first lens element has positive refractive power
Implementation Method 2
The second lens element has negative refractive power
Implementation Method 3
at least one of the object-side surface and an image-side surface of the fourth lens element has at least one inflection point
Data Source
AI summary
An optical imaging lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has positive refractive power. The second lens element has negative refractive power. The fourth lens element has an object-side surface being concave in a paraxial region thereof, wherein at least one of the object-side surface and an image-side surface of the fourth lens element has at least one inflection point. The optical imaging lens system has a total of four lens elements.