Dual Focusing Zoom Optics for Spherical Aberration Correction
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Solution Overview
Problem
Existing zoom optical systems face challenges in effectively correcting aberrations, particularly spherical aberration, during focusing from infinite to short-distance objects, due to inadequate lens group configurations and movements.
Innovation Solution
A zoom optical system comprising a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power, where the succeeding lens group includes a first focusing lens group with negative power and a second focusing lens group with positive power, arranged to satisfy specific focal length ratios and movement conditions, effectively correcting aberrations through controlled lens group movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional zoom optical system configuration is used, then the structure is simpler, but spherical aberration cannot be effectively corrected during focusing from infinite to short-distance objects
Solution Approach 1:
The succeeding lens group is divided into two separate focusing lens groups (first focusing lens group with negative refractive power and second focusing lens group with positive refractive power). This segmentation allows independent movement control of each group during focusing, enabling effective correction of spherical aberration while maintaining a manageable structural complexity
Solution Approach 2:
Different lens groups are assigned specific refractive powers and movement characteristics tailored to their local functions. The first focusing lens group has negative refractive power and moves in a specific direction, while the second focusing lens group has positive refractive power and moves differently, optimizing local optical properties for overall aberration correction
2Manufacturing precision
If the focal length ratio between the first and second focusing lens groups is not controlled, then the design is more flexible, but optical performance deteriorates
Solution Approach 1:
The patent establishes specific parameter ranges for the focal lengths of the first and second focusing lens groups, with the conditional expression 0.80 < -fF1/fF2 < 2.00. By controlling this parameter ratio, the system achieves optimal aberration correction performance while maintaining sufficient design flexibility for practical implementations
3Reliability
If lens groups are arranged to correct aberrations, then optical performance improves, but the system becomes more complex
Solution Approach 1:
The first and second focusing lens groups serve multiple functions: they enable focusing from infinite to short-distance objects, correct spherical aberration, and contribute to the overall zoom functionality. This multi-functionality reduces the need for additional dedicated components, maintaining reliability while controlling 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 system achieves excellent correction of spherical aberration and other aberrations across various focal lengths, ensuring high optical performance and compact design by adhering to defined focal length and movement ratios.
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
Implementation Method 2
a first focusing lens group having a negative refractive power which is moved during focusing, and a second focusing lens group having a positive refractive power which is moved during focusing
Data Source
AI summary
A zoom optical system comprises 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, and a succeeding lens group, which are arranged in order from an object side. During zooming, distances between adjacent said lens groups change. The succeeding lens group comprises a first focusing lens group having a negative refractive power which is moved during focusing, and a second focusing lens group having a positive refractive power which is moved during focusing, which are arranged in order from an object side. Further, the following conditional expression is satisfied:0.80<(−fF1)/fF2<5.00,where fF1 represents a focal length of the first focusing lens group, andfF2 represents a focal length of the second focusing lens group.