Zoom Optical Layout With Aperture Stop Positioning for Aberration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional zoom optical systems face challenges in achieving high zooming capability and wide angle of view while maintaining favorable optical performance and compact size, often leading to increased system size and variations in aberrations.
Innovation Solution
A zoom optical system design comprising a first lens group with positive refractive power and a second lens group with negative refractive power, where the aperture stop is positioned closer to the image than the second lens group, and satisfies specific conditional expressions to control the distances between lens groups and suppress aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the zooming capability and angle of view of the zoom optical system are increased, then the optical performance deteriorates and the system size increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the position of the aperture stop relative to the lens groups. The conditional expression 0.10 < Df/Dr < 0.90 defines specific parameter ranges for the distances Df (from aperture stop to object-side lens surface) and Dr (from aperture stop to image-side lens surface) in the wide-angle end state. By optimizing these geometric parameters, the system achieves high zooming capability while maintaining favorable optical performance across the zoom range.
2Adaptability or versatility
If the zooming capability and angle of view of the zoom optical system are increased, then the system size increases
Solution Approach 1:
The patent uses parameter changes to control the physical dimensions of the system. The conditional expression 0.10 < Df/Dr < 0.90 optimizes the aperture stop positioning to achieve compact system size while maintaining high zooming capability. This parameter optimization allows the optical system to achieve extended functionality without proportionally increasing the physical length of the moving 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 design achieves a high zooming ratio with favorable optical performance and reduced system size by effectively managing aberrations and field curves, while ensuring compactness and efficient operation.
Implementation Method 1
a first lens group having a positive refractive power; and a second lens group having a negative refractive power
Data Source
AI summary
A zoom optical system (ZL) comprises, in order from an object: a first lens group (G1) having a positive refractive power; and a second lens group (G2) having a negative refractive power, wherein upon zooming, a distance between the adjacent lens groups changes. The zoom optical system further comprises an aperture stop(S) disposed closer to an image than the second lens group (G2, and satisfies the following conditional expression:0.1<Df/Dr<0.90where Df: a distance to the aperture stop from a lens surface of the zoom optical system closest to an object in a wide angle end state, andDr: a distance from the aperture stop to a lens surface of the zoom optical system closest to the image in the wide angle end state.