Zoom Lens Aberration Correction via Segmented First Group
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional zoom lenses for high-definition and 4K resolution cameras lack sufficient correction of aberrations and miniaturization, especially in achieving wide angles of view while maintaining image quality.
Innovation Solution
A compact zoom lens design comprising a first fixed lens group with positive refractive power, moving lens groups, and a final fixed lens group with positive refractive power, where the 1a lens group includes negative lenses satisfying specific conditional formulae to correct aberrations, and the moving lens groups are configured to minimize fluctuations in spherical aberration and field curvature during zooming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional zoom lenses are designed with wide angles of view, then the field of view is improved, but aberration correction becomes insufficient
Solution Approach 1:
The first lens group is segmented into three sub-groups (1a, 1b, 1c) with different refractive powers and movement characteristics. The 1a lens group with negative refractive power is fixed during focusing, while the 1b lens group with positive refractive power moves during focusing, allowing independent optimization of aberration correction and focus performance for wide angle views
Solution Approach 2:
Different regions of the lens system are assigned different optical characteristics. The 1a lens group uses negative refractive power lenses positioned at specific locations to correct aberrations in the wide angle field region, while other lens groups handle different optical zones, achieving localized optimization of optical performance
2Volume of moving object
If lens size is reduced for miniaturization, then compactness is improved, but aberration correction performance deteriorates
Solution Approach 1:
The conditional formulae specify precise parameter ranges for the 1a lens group including refractive indices (νd1an, νd1ap), partial dispersion ratios (θgF1an, θgF1ap), and focal length ratios (f1an/f1a, f1ap/f1). By optimizing these parameters, high aberration correction is achieved within a compact lens structure
Solution Approach 2:
The lens system uses composite optical design combining negative refractive power lenses and positive refractive power lenses in specific configurations. The 1a lens group combines negative and positive lenses with carefully controlled parameters to achieve both miniaturization and superior aberration correction performance
3Device complexity
If the lens structure is simplified, then manufacturing complexity is reduced, but aberration correction and miniaturization performance are insufficient
Solution Approach 1:
The 1b lens group is designed to move during focusing operations, introducing dynamic adjustment capability. This allows the lens system to maintain optimal aberration correction across different focus distances while keeping the overall structure relatively simple, balancing manufacturing complexity with optical performance
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 a high-performance zoom lens that is compact, provides a wide angle of view, and effectively corrects various aberrations, resulting in high-quality images with improved miniaturization and reduced aberration fluctuations.
Implementation Method 1
a 1a lens group having a negative refractive power which is fixed during focusing operations
Implementation Method 2
at least two moving lens groups that move to change the distance among adjacent lens groups in the direction of the optical axis when changing magnification
Data Source
AI summary
A zoom lens is constituted by, in order from the object side to the image side: a positive first lens group which his fixed when changing magnification; at least two moving lens groups that move when changing magnification; and a positive final lens group which is fixed when changing magnification. The first lens group is constituted by, in order from the object side to the image side: a negative 1a lens group which is fixed during focusing operations, a positive 1b lens group which moves during focusing operations, and a positive 1c lens group which is fixed during focusing operations. The 1a lens group includes at least one negative lens that satisfies predetermined conditional formulae.