Image-Capturing Optical Lens Assembly Aberration Correction
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Solution Overview
Problem
Conventional image-capturing optical lens assemblies with large angles of view struggle to achieve a balance between a wide field of view and effective aberration correction, often resulting in poor image quality due to inadequate refractive power distribution and sensitivity issues.
Innovation Solution
The proposed image-capturing optical lens assembly comprises a front lens group with a first negative refractive power lens and a second positive refractive power lens, combined with a rear lens group featuring a third positive refractive power lens, a fourth negative refractive power lens, and a fifth positive refractive power lens, with specific curvature radius and focal length relationships to enhance field of view and correct aberrations, while reducing the total track length and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If an inverse telephoto structure with a single lens element in the rear lens group is used to achieve a wide field of view, then the field of view is enlarged, but the aberration correction becomes ineffective and image quality deteriorates
Solution Approach 1:
The rear lens group is divided into multiple lens elements (third, fourth, and fifth lens elements) instead of using a single lens element. This segmentation allows each lens element to contribute to different aspects of aberration correction while maintaining the wide field of view, resolving the contradiction between field of view enlargement and aberration correction effectiveness
Solution Approach 2:
Different lens elements are assigned different refractive powers and optical characteristics tailored to their specific functions. The third lens element provides positive refractive power for focal length control, the fourth lens element provides negative refractive power for aberration correction, and the fifth lens element provides positive refractive power for additional correction and telephoto effects. This local optimization of optical properties enables effective aberration correction while maintaining a wide field of view
2Manufacturing precision
If more lens elements are added to improve aberration correction, then image quality improves, but the total track length increases and compactness is reduced
Solution Approach 1:
The patent optimizes key parameters including the curvature radii of lens surfaces, the thicknesses of lens elements, and the spacing between lens elements. By carefully adjusting these parameters, the lens assembly achieves effective aberration correction with a compact total track length, resolving the contradiction between image quality improvement and compactness maintenance
Solution Approach 2:
The patent utilizes the thickness dimension of lens elements and the spacing between elements to optimize the optical path length. By strategically placing lens elements and adjusting their dimensions, the system achieves effective aberration correction without proportionally increasing the overall track length, maintaining compactness while improving image quality
3Length of moving object
If the refractive power is concentrated in fewer lens elements, then the lens assembly becomes more compact, but the sensitivity and aberration correction become insufficient
Solution Approach 1:
The total refractive power is segmented and distributed across multiple lens elements with different refractive powers. The third lens element provides positive refractive power, the fourth lens element provides negative refractive power, and the fifth lens element provides positive refractive power. This distribution reduces sensitivity and improves aberration correction while maintaining a compact design
Solution Approach 2:
The lens assembly uses a composite structure with lens elements of different materials and refractive properties. By combining lens elements with different refractive powers and optical characteristics, the system achieves effective aberration correction and reduced sensitivity while maintaining compactness, resolving the contradiction between compactness and correction effectiveness
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 effectively enlarges the field of view, corrects aberrations, and reduces the total track length, resulting in improved image quality and photosensitivity, while maintaining a compact design suitable for applications like mobile phone cameras and rear-view cameras.
Implementation Method 1
a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; and a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface
Data Source
AI summary
The present invention provides an image-capturing optical lens assembly comprising, in order from an object side to an image side, a front lens group, a stop, and a rear lens group. The front lens group comprises, in order from the object side to the image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; and a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface. The rear lens group comprises, in order from the object side to the image side: a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fourth lens element with negative refractive power; and a fifth lens element with positive refractive power having a convex image-side surface. With such an arrangement of optical elements, the optical system will have a field of view that is large enough; meanwhile, aberrations of the optical system can be favorably corrected to obtain good image quality.