Optical Lens System Aberration Correction via Seven-Element Segmentation
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Solution Overview
Problem
Conventional optical lens systems with a wide field of view face challenges in correcting aberrations and maintaining image quality due to the complexity of their structure, particularly in miniaturized designs where the rear lens group consists of only one element, leading to difficulties in achieving both a wide field of view and high resolution without increasing the total track length.
Innovation Solution
The optical lens system comprises seven lens elements with specific refractive powers and surface curvatures, including a first lens with negative refractive power, a second lens with positive refractive power, and a sixth lens with negative refractive power, arranged to satisfy specific relations for curvature and focal lengths, which corrects aberrations and maintains a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the rear lens group consists of only one lens element to achieve miniaturization, then the total track length is reduced, but the ability to correct aberrations deteriorates
Solution Approach 1:
The lens system is divided into multiple lens elements (seven elements in total) with different refractive powers and surface curvatures. The rear lens group is segmented into multiple elements instead of one, allowing each element to contribute to correcting specific types of aberrations while maintaining a compact overall structure.
Solution Approach 2:
Different lens elements are designed with specific local properties: the first lens element has negative refractive power with a convex object-side surface and concave image-side surface, while other elements have positive refractive power. Each element's surface curvatures and refractive powers are optimized to address specific aberration types, enabling effective aberration correction in a miniaturized design.
2Area of stationary object
If the first lens element has a convex object-side surface and concave image-side surface with negative refractive power, then the field of view is enlarged and light refraction is improved, but the complexity of the lens system increases
Solution Approach 1:
The first lens element uses an inverted surface configuration (convex object-side, concave image-side) with negative refractive power, which is opposite to the conventional positive meniscus shape. This inverted design enables wider field of view and improved light refraction by diverging light rays appropriately, while the subsequent positive power elements compensate for the added complexity.
Solution Approach 2:
The lens system employs specific parameter relationships to manage complexity: the ratio (R11+R12)/(R11-R12) is controlled within -0.7 to 0.7, and the focal length ratio f/f1 is maintained between -0.3 and -0.7. These parameter constraints optimize the balance between field of view enlargement and system complexity.
3Manufacturing precision
If multiple lens elements with specific refractive powers are used to correct aberrations, then image quality is improved, but the total track length increases
Solution Approach 1:
The lens system uses a dynamic combination of negative and positive refractive power elements arranged in a specific sequence. The sixth lens element with negative power and seventh element with positive power create a balanced optical path that corrects aberrations while controlling the overall track length through optimized spacing and curvature relationships.
Solution Approach 2:
The patent addresses the track length issue by optimizing the radial dimensions (surface curvatures R11, R12, R21, R22, etc.) of each lens element. By carefully controlling the curvature radii and thicknesses in the radial dimension, the system achieves effective aberration correction without proportionally increasing the axial track 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
This configuration achieves a wide field of view while effectively correcting aberrations and maintaining good image quality, ensuring the optical lens system is compact and efficient in design.
Implementation Method 1
an optical lens system comprises, in order from an object side to an image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element; a third lens element; a fourth lens element having a concave object-side surface and a convex image-side surface; a fifth lens element with positive refractive power; a sixth lens element with negative refractive power
Data Source
AI summary
An optical lens system with a wide field of view 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; a second lens element; a third lens element; a fourth lens element having a concave object-side surface and a convex image-side surface; a fifth lens element with positive refractive power; a sixth lens element with negative refractive power; a seventh lens element, one of an object-side surface and an image-side surface being aspheric. There are seven lens elements with refractive power. By adjusting the arrangement of curvature, refractive power of the respective lens elements and a stop, sufficient field of view can be obtained and the aberrations of the system can be corrected in order to obtain good image quality.