Variable Magnification Optical System Aberration Correction
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Solution Overview
Problem
Conventional variable magnification optical systems suffer from insufficient optical performance, particularly in correcting aberrations such as lateral chromatic aberration, curvature of field, and spherical aberration, especially at the telephoto end state.
Innovation Solution
A variable magnification optical system comprising a configuration of lens groups with specific refractive powers, including a first lens group with negative refractive power, a second lens group with positive refractive power, and a third lens group with negative refractive power, where air intervals between neighboring lens groups are varied, and the first lens group consists of lens components with negative refractive power, including aspherical surfaces to correct aberrations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional variable magnification optical systems are used, then the system structure is simpler, but the optical performance is insufficient
Solution Approach 1:
The optical system is divided into four distinct lens groups with specific refractive power assignments: a first lens group with negative refractive power, a second lens group with positive refractive power, a third lens group with negative refractive power, and a rear group with positive refractive power. This segmentation allows each group to be optimized for correcting specific aberrations, thereby improving overall optical performance while maintaining manageable structural complexity through functional specialization.
Solution Approach 2:
Different regions of the optical system are assigned different refractive power characteristics tailored to their specific functions. The first and third lens groups use negative refractive power to control specific aberrations, while the second and rear groups use positive refractive power for other correction purposes. This local optimization of refractive properties enables superior aberration correction across the entire zoom range without requiring uniform system complexity.
2Reliability
If more lens groups are added to correct aberrations, then optical performance improves, but device complexity increases
Solution Approach 1:
Each lens group is designed to perform multiple functions simultaneously. For example, the first lens group with negative refractive power not only contributes to overall focal length control but also specifically addresses lateral chromatic aberration and curvature of field. The second lens group with positive refractive power handles spherical aberration correction while contributing to magnification control. This multi-functionality reduces the need for additional specialized groups, achieving comprehensive aberration correction with a manageable number of lens groups.
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 superb optical performance by effectively correcting lateral chromatic aberration, curvature of field, and spherical aberration across various focal lengths, resulting in a compact and lightweight design.
Implementation Method 1
a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group having negative refractive power, and a rear group comprising at least one lens group and having positive refractive power as a whole
Implementation Method 2
said first lens group consisting of a lens component(s) having negative refractive power
Data Source
AI summary
A variable magnification optical system comprising, in order from an object side, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, a third lens group G3 having negative refractive power and a rear group comprising at least one lens group and having positive refractive power as a whole; upon varying magnification, air intervals between the neighboring lens groups being varied; and said first lens group G1 consisting of lens component(s) having negative refractive power, thereby a variable magnification optical system having excellent optical performance, an optical apparatus and a method for manufacturing the variable magnification optical system, being provided.