Micro Zoom Lens Aberration Correction via Group Segmentation
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Solution Overview
Problem
The miniaturization of zoom lenses for compact digital cameras and digital video cameras embedded in cell phones requires improved aberration characteristics and productivity, while maintaining a micro size, as existing technologies face challenges in achieving optimal refractive power distribution and sensitivity.
Innovation Solution
A zoom lens design comprising a first lens group with negative refractive power and a second lens group with positive refractive power, where the interval between the groups is varied for zooming, incorporating aspheric surfaces and specific focal length ratios to optimize aberration performance within defined numerical constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the zoom lens is miniaturized for compact digital cameras and cell phones, then the device size is reduced, but the aberration characteristics deteriorate and manufacturing precision becomes more difficult to control
Solution Approach 1:
The zoom lens is divided into multiple lens groups (first lens group with negative refractive power, second lens group with positive refractive power, third lens group) that can be independently positioned and adjusted. This segmentation allows each group to be optimized for specific functions while maintaining overall compact size, resolving the contradiction between miniaturization and aberration control.
Solution Approach 2:
The patent employs variable interval positioning between lens groups where the distance between the first and second lens groups can be adjusted during zooming operations. This dynamic adjustment capability allows the lens system to maintain optimal aberration characteristics across different focal lengths while remaining compact when not in use.
2Manufacturing precision
If the refractive power distribution is optimized for miniaturized zoom lens, then the aberration characteristics improve, but the device complexity increases
Solution Approach 1:
Different lens groups are assigned specific refractive power characteristics tailored to their local functions. The first lens group has negative refractive power for specific aberration correction, the second has positive refractive power for focusing, and the third provides additional correction. This localized optimization achieves superior overall aberration characteristics without requiring complex redesign of the entire lens system.
3Adaptability or versatility
If the focal length ratio is increased for telephoto capability, then the zoom range improves, but the total length of the lens increases
Solution Approach 1:
The lens groups are arranged in a nested configuration where the first and second lens groups are positioned close to the imaging device with the third lens group integrated into the structure. This nesting allows the lens to achieve extended focal length ratio for telephoto capability while maintaining a compact total length by efficiently utilizing the available space through layered arrangement.
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 enables the production of a micro-sized zoom lens with superior aberration characteristics and improved productivity, maintaining performance while avoiding issues like coma and sensitivity increases, and ensuring optimal slimness and aberration correction.
Implementation Method 1
a first lens group located adjacent to an object side and having a total negative refractive power; and a second lens group located adjacent to an image side and having a total positive refractive power
Implementation Method 2
incorporating aspheric surfaces and specific focal length ratios to optimize aberration performance
Data Source
AI summary
A zoom lens is disclosed. The zoom lens comprises a first lens group located adjacent to an object side and having a negative refractive power, and a second lens group located adjacent to an image side and having a positive refractive power, wherein zooming is made as an interval between the first lens group and the second lens group is varied.