Three-Group Imaging Optical Assembly for Short Track Length
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Solution Overview
Problem
Conventional lens assemblies fail to meet the demands of compact size and enhanced imaging quality required for future technological developments in electronic devices, particularly in correcting aberrations and balancing refractive power.
Innovation Solution
An image capturing optical assembly with a configuration of three lens groups, each comprising aspheric surfaces and inflection points, and specific refractive index and Abbe number ranges, along with air gaps between lens elements, to correct aberrations and reduce total track length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lens assemblies are used, then the structure is simple, but the imaging quality is insufficient and aberrations cannot be corrected
Solution Approach 1:
The lens assembly is divided into three distinct lens groups, each containing multiple lens elements with specific functions. This segmentation allows each group to be optimized for particular aberration corrections while maintaining overall system performance, resolving the contradiction between imaging quality and structural simplicity.
Solution Approach 2:
Aspheric surfaces are employed on multiple lens elements within the three lens groups. These aspheric surfaces replace traditional spherical surfaces to correct various aberrations including spherical aberration, coma, and astigmatism, thereby improving imaging quality without requiring excessive lens elements.
2Manufacturing precision
If more lens elements are added to correct aberrations, then imaging quality improves, but the total track length increases
Solution Approach 1:
The patent specifies precise parameter ranges for lens elements including refractive index (1.5 < N < 2.0), Abbe number (15 < V < 30), and focal length ratios. By optimizing these parameters within defined ranges, the lens assembly achieves effective aberration correction while controlling the total track length to be less than 4.0 times the focal length.
Solution Approach 2:
Different lens groups are assigned specific local functions: the first lens group primarily corrects spherical aberration and coma, the second lens group addresses astigmatism and field curvature, and the third lens group fine-tunes chromatic aberration. This localized optimization allows efficient aberration correction without requiring uniform increases in all lens elements.
3Power
If high refractive index materials are used, then lens power is increased, but chromatic aberration worsens
Solution Approach 1:
The patent employs composite material selection across the three lens groups, combining materials with different refractive indices and Abbe numbers. Specifically, the lens elements use materials where refractive index ranges from 1.5 to 2.0 and Abbe number ranges from 15 to 30, creating a composite optical system that balances lens power with chromatic aberration control through material diversity.
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 imaging quality, corrects off-axis aberrations, and achieves a compact design suitable for electronic devices by balancing refractive power and reducing total track length.
Implementation Method 1
Each of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, and the eighth lens element has an object-side surface facing towards the object side and an image-side surface facing towards the image side. At least one surface of at least one of the lens elements of the first lens group is aspheric
Implementation Method 2
At least one surface of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, and the eighth lens element includes at least one inflection point
Data Source
AI summary
An image capturing optical assembly includes, in order from an object side to an image side, a first lens group, a second lens group and a third lens group, wherein the first lens group includes a first lens element and a second lens element, the second lens group includes a third lens element, a fourth lens element and a fifth lens element, and the third lens group includes a sixth lens element, a seventh lens element and an eighth lens element. At least one surface of at least one of the lens elements of each lens group is aspheric. At least one surface of at least one of the lens elements includes at least one inflection point.