Six-Element Image-Capturing Lens Assembly for Aberration Control
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Solution Overview
Problem
Conventional compact optical lens systems for portable electronic devices, such as smartphones and PDAs, fail to meet the increasing demands for high image quality due to improper refractive power distribution and lens curvature, limiting chromatic aberration and astigmatism correction, and are unable to effectively enhance resolving power.
Innovation Solution
An image capturing optical lens assembly comprising six 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 concave object-side surface, a third lens with negative refractive power, a fourth lens with refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power and an aspheric concave image-side surface, featuring relationships between curvatures and distances to balance telecentric and wide-angle characteristics and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-element or five-element lens structure is used, then the device complexity is reduced, but the image quality and resolving power cannot meet high-end requirements
Solution Approach 1:
The optical lens system is divided into six distinct lens elements with specific refractive powers and curvature configurations. Each lens element (first through sixth) has designated object-side and image-side surfaces with specific curvature relationships, allowing independent optimization of aberration correction for each element while maintaining overall system performance.
Solution Approach 2:
Different lens elements are assigned specific local optical properties: the first lens has positive refractive power with specific curvature relationships, the second lens has negative refractive power with concave object-side surface, the third lens has negative refractive power, the fourth lens has refractive power, the fifth lens has positive refractive power with convex image-side surface, and the sixth lens has negative refractive power with aspheric surfaces. This local differentiation enables targeted correction of various aberrations throughout the optical path.
2Manufacturing precision
If the refractive power distribution and lens curvature are not properly designed, then the manufacturing is simpler, but the chromatic aberration and astigmatism cannot be corrected effectively
Solution Approach 1:
The patent establishes specific parameter relationships for the lens elements: curvature relationships (e.g., object-side surface curvature C3 and image-side surface curvature C4 of the second lens), refractive power distribution across the six elements, and distance ratios (e.g., Dsc/TL between stop and critical point). These parameter constraints enable systematic correction of chromatic aberration and astigmatism while providing a structured design framework that guides manufacturing.
3Manufacturing precision
If a six-element lens structure is used, then the image quality can be improved, but the device size increases and is hard to apply to portable electronics
Solution Approach 1:
The patent employs aspheric surfaces on the object-side and image-side surfaces of the sixth lens element, with at least one inflection point on the image-side surface. This curvature design enables more compact lens element configurations and better control of light paths, reducing the overall optical system size while maintaining high image quality and aberration correction capabilities suitable for portable electronics.
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 lens assembly achieves improved image quality, correcting chromatic aberration, astigmatism, and coma, while maintaining a compact size suitable for portable electronics, with balanced refractive power distribution and reduced sensitivity, enhancing resolving power and image quality.
Implementation Method 1
The first lens element with positive refractive power, the second lens element with negative refractive power, the third lens element with negative refractive power, the fourth lens element with refractive power, the fifth lens element with positive refractive power, and the sixth lens element with refractive power
Data Source
AI summary
An image capturing optical lens assembly 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, a fifth lens element, and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element with negative refractive power has a concave object-side surface. The third lens element has negative refractive power. The fourth lens element has refractive power. The fifth lens element with positive refractive power has a convex image-side surface. The sixth lens element with refractive power has a concave image-side surface, wherein an object-side surface and the image-side surface of the sixth lens element are aspheric, and the sixth lens element has at least one inflection point on the image-side surface thereof.