Aspheric Lens System Aberration Correction Compact Design
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Solution Overview
Problem
Conventional imaging lens systems are bulky and suffer from poor convergent performance, aberrations, and chromatic aberrations due to their multi-element structure with spherical surfaces, making them unsuitable for compact, high-image-quality applications in electronic devices.
Innovation Solution
A compact imaging lens system comprising five lens elements with specific refractive powers and aspheric surfaces, including a first lens with positive refractive power, a second lens with negative refractive power, and a fifth lens with negative refractive power, optimized by adjusting axial distances and thicknesses to correct aberrations and reduce bulkiness, while maintaining high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a multi-element structure with spherical surfaces is used, then the imaging lens system can be designed with multiple lens elements, but the system becomes bulky and has poor convergent performance
Solution Approach 1:
The patent applies aspheric surfaces to lens elements instead of spherical surfaces. This allows for better light convergence and aberration correction while reducing the overall system length. The aspheric profiles enable more compact design by improving the optical path efficiency within a shorter distance.
Solution Approach 2:
The patent changes the geometric parameters of lens elements including aspheric coefficients, curvature radii, and thickness distributions. These parameter optimizations allow the lens system to achieve better convergent performance in a more compact configuration, resolving the contradiction between multi-element complexity and system size.
2Ease of manufacture
If glass lens elements with spherical surfaces are used, then the lens system can be manufactured, but it results in poor convergent performance and aberrations
Solution Approach 1:
The patent employs aspheric surfaces on lens elements to improve convergent performance and reduce aberrations. Modern manufacturing techniques allow aspheric surfaces to be produced with sufficient precision, making this principle applicable while maintaining ease of manufacture and significantly improving optical performance.
Solution Approach 2:
The patent uses plastic lens materials with specific refractive indices and Abbe numbers to achieve both manufacturability and high convergent performance. Plastic materials can be molded into aspheric shapes more easily than glass, and the selected materials provide the necessary optical properties for effective light convergence and aberration control.
3Length of moving object
If the spacing between lens elements is reduced, then the system becomes more compact, but there is insufficient space for light beam travel causing aberrations
Solution Approach 1:
The aspheric surfaces on lens elements enable better control of light paths in compact configurations. The non-spherical profiles are specifically designed to guide light rays effectively even when spacing between elements is reduced, maintaining aberration control while achieving system compactness.
Solution Approach 2:
The patent applies different aspheric profiles to different regions of the lens elements (different zones have different curvature characteristics). This local optimization allows effective light beam management in the limited space between compactly arranged lens elements, preventing aberrations despite reduced spacing.
4Reliability
If the thickness of lens elements is increased, then the convergent performance improves, but the system becomes bulkier
Solution Approach 1:
The aspheric surfaces provide enhanced convergent performance without requiring increased lens thickness. The non-spherical geometry allows for more efficient light bending and focusing within thinner lens elements, improving convergence while maintaining system compactness.
Solution Approach 2:
The patent optimizes the thickness parameters of lens elements in combination with aspheric profile parameters. By carefully selecting and coordinating these parameters, the system achieves good convergent performance with appropriately controlled lens thicknesses, avoiding excessive system length.
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 solution enhances convergent performance, corrects aberrations, and reduces the system's bulkiness, achieving high image quality and compactness suitable for electronic devices like smartphones and tablets.
Implementation Method 1
a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof
Implementation Method 2
a second lens element with negative refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof
Implementation Method 3
a fourth lens element with negative refractive power, an object-side surface and an image-side surface thereof being aspheric
Data Source
AI summary
This disclosure provides an imaging lens system, including, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with refractive power; a fourth lens element with refractive power having an object-side surface and an image-side surface thereof being aspheric; a fifth lens element with refractive power having a convex object-side surface, the object-side surface and an image-side surface thereof being aspheric, and at least one of the object-side surface and the image-side surface being provided with at least one inflection point. The imaging lens system is further provided with a stop, and no lens element with refractive power is disposed between the stop and first lens element.