Zooming Optical System Aberration Control via Lens Group Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional zooming optical systems experience significant aberration fluctuations during zooming and are prone to ghost and flare generation, which degrade optical performance.
Innovation Solution
A zooming optical system comprising five lens groups with specific refractive powers and movements, including a first lens group moved along the optical axis and other groups moved orthogonally, with conditional expressions governing focal length ratios and aperture stop positions to minimize aberrations and ghosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional zooming optical system is used, then the structure is simple, but aberration fluctuation upon zooming is considerable
Solution Approach 1:
The optical system is divided into five distinct lens groups with alternating positive and negative refractive powers. Each lens group is independently movable, allowing precise control of aberrations during zooming. The first lens group moves along the optical axis, while at least one other lens group moves with a component orthogonal to the optical axis, enabling independent optimization of different aberration types at different zoom positions.
Solution Approach 2:
The patent implements dynamic movement mechanisms for multiple lens groups during zooming. The first lens group dynamically adjusts position along the optical axis, while other lens groups dynamically adjust positions with orthogonal components. This dynamic configuration allows the system to maintain optimal aberration correction across the entire zoom range, transforming a static design into an adaptive optical system.
2Device complexity
If conventional lens configurations are used, then the design is simple, but reflected light causing ghosts and flares is easily generated
Solution Approach 1:
The patent applies local quality optimization by assigning specific refractive power characteristics to each lens group. The alternating positive and negative refractive powers are strategically distributed across the five lens groups, with each group positioned to address specific optical path issues. This localized optimization of refractive properties reduces reflected light generation at critical interfaces while maintaining overall system simplicity.
3Manufacturing precision
If multiple lens groups with orthogonal movement are added, then aberration fluctuations are suppressed, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by designing lens groups that perform multiple roles simultaneously. The first lens group with positive refractive power both contributes to overall focusing and corrects aberrations through its axial movement. Other lens groups with negative refractive power simultaneously manage different types of aberrations and control light paths to reduce ghosts and flares. This universal design reduces the need for additional specialized components.
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 effectively suppresses aberration fluctuations and reduces ghost and flare occurrences, enhancing optical performance by optimizing lens group movements and refractive power distributions.
Implementation Method 1
a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; a fourth lens group G4 having negative refractive power; and a fifth lens group G5 having positive refractive power
Data Source
AI summary
A zooming optical system comprises, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power. Upon zooming, distances between adjacent lens groups of the first to the fifth lens groups change respectively. The zooming optical system further satisfies the conditional expression 9.6<ft/(−f2)<20.0, where ft denotes a focal length of the zooming optical system in a telephoto end state, and f2 denotes a focal length of the second lens group.