Five-Element Aspheric Lens System Aberration Control
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Solution Overview
Problem
Conventional compact optical lens assemblies for portable electronic devices face challenges in achieving high image quality due to issues like stray light, astigmatism, and asymmetry, particularly with five-element lens structures that generate larger refraction angles and excessive aberrations.
Innovation Solution
The optical image capturing system employs a five non-cemented lens element structure, with specific refractive powers and surface designs for each element, including positive and negative refractive powers, aspheric surfaces, and inflection points, to minimize refraction angles and aberrations, and uses plastic or glass materials for flexibility and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a five-element lens structure is used to improve image quality and resolution, then better image quality is achieved, but larger refraction angles are generated causing more stray light
Solution Approach 1:
The patent changes the refractive power distribution parameter among lens elements. Specifically, the fourth lens element is designed with negative refractive power while the first, third, and fifth elements have positive refractive power. This parameter change optimizes the refraction angle to reduce stray light while maintaining high image quality and resolution.
2Ease of manufacture
If the lens element adjacent to the image side has weaker refractive power in a conventional five-element structure, then easier manufacturing is achieved, but excessive astigmatism is generated at the peripheral region
Solution Approach 1:
The patent optimizes the refractive power parameter of the fifth lens element (adjacent to the image side) by setting it to positive refractive power with a specific range. This parameter change corrects excessive astigmatism at the peripheral region while maintaining ease of manufacture through reasonable design constraints.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements including the fourth and fifth elements. This curvature design allows precise control of light rays at the peripheral region, effectively correcting astigmatism while maintaining manufacturability through standardized aspheric surface processing.
3Ease of manufacture
If conventional surface design is used to simplify manufacturing, then easier production is achieved, but asymmetry and reduced image brightness occur
Solution Approach 1:
The patent applies aspheric surfaces to the fourth lens element (both object-side and image-side surfaces) and the fifth lens element. This curved surface design optimizes light distribution and reduces asymmetry, thereby improving image brightness and quality while remaining compatible with modern manufacturing capabilities.
4Volume of moving object
If a compact optical lens assembly is designed for portable devices, then smaller size is achieved, but high-end specifications and image quality requirements cannot be satisfied
Solution Approach 1:
The patent divides the optical system into five separate non-cemented lens elements with specific refractive powers. This segmentation allows independent optimization of each element's parameters (refractive power, curvature, thickness) to achieve high image quality in a compact configuration suitable for portable devices.
Solution Approach 2:
The patent optimizes multiple parameters including the refractive power distribution (positive-negative-positive-positive pattern), aspheric surface curvatures, and element thicknesses. These parameter changes enable the compact five-element assembly to meet high-end specifications for image quality and resolution.
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 reduces stray light, enhances image brightness and quality, particularly at the peripheral regions, and maintains a compact size by optimizing the distribution of refractive power and correcting aberrations, leading to improved image resolution and sensing efficiency under various lighting conditions.
Implementation Method 1
The first lens element with positive refractive power has a convex object-side surface and a concave image-side surface. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface
Data Source
AI summary
An optical image capturing system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element and each of the first through fifth lens elements is single and non-cemented. The first lens element with positive refractive power has a convex object-side surface and a concave image-side surface. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface, and the surfaces of the fourth lens element are aspheric. The fifth lens element with refractive power has a concave image-side surface, and the surfaces of the fifth lens element are aspheric. The fifth lens element has at least one inflection point formed on the image-side surface thereof.