Zoom Optical System Aberration Correction via Lens Group Dynamics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional zoom optical systems for cameras suffer from insufficient optical performance, particularly in terms of aberration correction across different zoom and focus states.
Innovation Solution
A zoom optical system comprising multiple lens groups with specific refractive powers and focal lengths, where the intermediate side lens group and subsequent side lens group have positive refractive power, and the subsequent side lens group moves upon focusing, with conditional expressions governing the focal length ratios to ensure effective aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zoom optical system configurations are used, then the system structure is simple, but optical performance is insufficient
Solution Approach 1:
The zoom optical system is divided into five distinct lens groups (first lens group with positive refractive power, intermediate group with negative refractive power, intermediate side lens group with positive refractive power, subsequent side lens group with positive refractive power, and subsequent group with positive refractive power). Each group has specific functions and movement characteristics that contribute to overall optical performance while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent implements dynamic movement of lens groups during zooming operations. Specifically, the distances between the first lens group and intermediate group, between intermediate group and intermediate side lens group, between intermediate side lens group and subsequent side lens group, and between subsequent side lens group and subsequent group all change upon zooming. The subsequent side lens group also moves upon focusing, enabling adaptive optical performance across different focal lengths.
2Reliability
If the subsequent side lens group includes at least two lenses with specific focal length ratios, then aberration correction is improved, but the number of components increases
Solution Approach 1:
The patent specifies precise parameter relationships to optimize aberration correction. The conditional expression 0.21 < fRP1/fRP2 < 0.85 defines the focal length ratio between the intermediate side lens group (fRP1) and subsequent side lens group (fRP2). Additionally, the subsequent side lens group includes at least two lenses with specific refractive powers and focal lengths that satisfy these parameter constraints, enabling effective aberration control through mathematical optimization rather than arbitrary component selection.
3Reliability
If a larger barrel is used to accommodate more lenses, then aberration correction is better, but the device size increases
Solution Approach 1:
The patent employs dynamic focusing by moving the subsequent side lens group along the optical axis to adjust focus from infinity to close-up distances. This dynamic adjustment mechanism eliminates the need for additional fixed lenses that would increase device size, as the same lens group adapts its position to correct aberrations at different focus distances, maintaining compact form factor while achieving excellent 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 system achieves successful aberration correction across various zoom and focus states, preventing spherical aberration and ensuring excellent optical performance, allowing for a small and lightweight focusing lens group and quick autofocus without a large barrel.
Implementation Method 1
a first lens group having positive refractive power; an intermediate group including at least one lens group and having negative refractive power as a whole; an intermediate side lens group having positive refractive power; a subsequent side lens group having positive refractive power
Data Source
AI summary
A zoom optical system (ZL) comprises, in order from an object: a first lens group (G1) having positive refractive power; an intermediate group (GM) including at least one lens group and having negative refractive power as a whole; an intermediate side lens group (GRP1) having positive refractive power; a subsequent side lens group (GRP2) having positive refractive power; and a subsequent group (GR) including at least one lens group. The subsequent side lens group (GRP2) moves upon zooming. The subsequent side lens group (GRP2) includes at least two lenses. A following conditional expression is satisfied.0.2<fRP1/fRP2<0.8where,fRP1 denotes a focal length of the intermediate side lens group (GRP1), andfRP2 denotes a focal length of the subsequent side lens group (GRP2).