Five-Group Zoom Lens Aberration Correction
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Solution Overview
Problem
Existing zoom lenses for digital cameras and cinematic cameras have large F values at the telephoto end and insufficient aberration correction, failing to meet the demand for high-performance lenses with small F values throughout the zoom range.
Innovation Solution
A zoom lens configuration comprising five lens groups with specific refractive powers and distance relationships, including a first lens group with positive power, a second lens group with negative power, a third lens group with positive power, a fourth lens group with negative power, and a fifth lens group with positive power, optimized by conditional formulas to achieve a small F value and effective aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional zoom lens configurations are used, then the lens structure is relatively simple, but the F value becomes large at the telephoto end and aberration correction is insufficient
Solution Approach 1:
The zoom lens is divided into five distinct lens groups (G1-G5) with alternating positive and negative refractive powers. Each group contains specifically designed lenses that work together to independently control different aspects of light propagation, enabling simultaneous optimization of F value and aberration correction across the entire zoom range.
Solution Approach 2:
Different regions of the optical system are assigned different functional characteristics. The first lens group (G1) with positive power and the second lens group (G2) with negative power are positioned to specifically control telephoto end performance, while subsequent groups address aberration correction in their respective zones, creating locally optimized performance throughout the system.
2Manufacturing precision
If the number of lens groups is increased to improve aberration correction, then the device complexity increases
Solution Approach 1:
The zoom lens employs dynamic movement of lens groups during zooming operations. The distance between G1-G2 constantly increases, G2-G3 constantly decreases, and G3-G4 constantly changes while G4-G5 constantly increases. This dynamic configuration allows the system to maintain optimal performance across varying focal lengths without requiring excessive lens elements.
Solution Approach 2:
The invention optimizes specific parameters including the refractive powers of each lens group, the distances between groups during zooming, and the focal length ratios. By carefully controlling these parameters within defined ranges, the system achieves superior aberration correction and F value performance without proportionally increasing complexity.
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 zoom lens with a small F value throughout the entire zoom range, effectively correcting various aberrations and providing bright, high-quality images.
Implementation Method 1
a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a negative refractive power; and a fifth lens group having a positive refractive power
Data Source
AI summary
A zoom lens includes, in order from the object side: a positive first lens group; a negative second lens group; a positive third lens group; a negative fourth lens group; and a positive fifth lens group. The distance between the first and second lens groups constantly increases, the distance between the second and third lens groups constantly decreases, the distance between the third and fourth lens groups constantly changes, and the distance between the fourth and fifth lens groups constantly increases when changing magnification from the wide angle to the telephoto end. The first lens group includes three lenses. The second lens group includes four lenses. The third lens group includes six lenses and an aperture stop. The fifth lens group includes a single lens component.