Variable Magnification Optics With Dynamic Lens Group Spacing
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Solution Overview
Problem
Existing variable magnification optical systems are not compact in configuration and do not maintain good optical performance throughout the entire magnification change range.
Innovation Solution
A variable magnification optical system with specific conditional expressions governing lens group spacings and movements, including a focusing group on the image side, to ensure compactness and consistent optical performance across different magnification settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a variable magnification optical system is designed to be compact in configuration, then the overall system size is reduced, but it becomes difficult to maintain good optical performance throughout the entire magnification change range
Solution Approach 1:
The optical system is divided into multiple lens groups (first lens group with negative refractive power, intermediate groups, and final lens group) that can move independently relative to each other during magnification change. This segmentation allows each group to contribute differently to the overall optical performance across the zoom range while maintaining a compact total system size.
Solution Approach 2:
The patent employs dynamic movement of lens groups during magnification change, where the spacing between the first lens group and intermediate groups changes, and spacings between adjacent lens groups in the intermediate groups change. This dynamic configuration enables the system to maintain good optical performance throughout the entire magnification range despite the compact size.
2Volume of moving object
If lens groups are positioned closer together to achieve compactness, then the system becomes more compact, but optical performance deteriorates due to increased optical path interference
Solution Approach 1:
Different regions of the optical system are assigned different functions and characteristics. The first lens group with negative refractive power is positioned at the object side, followed by intermediate groups with specific refractive powers, and a final lens group at the image side. This local differentiation of optical properties allows compact spacing while maintaining overall optical performance.
Solution Approach 2:
Intermediate lens groups are introduced as mediators between the first lens group and the final lens group. These intermediate groups have specifically designed refractive powers and movement characteristics that mediate the optical interaction between the other groups, enabling compact configuration while preventing optical path interference and maintaining image quality.
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 a compact configuration while maintaining good optical performance throughout the entire magnification change range, enhancing imaging quality.
Implementation Method 1
a first lens group having negative refractive power, an intermediate group consisting of a plurality of lens groups, and a final lens group having refractive power
Data Source
AI summary
A variable magnification optical system consists of, in order from an object side to an image side, a first lens group having negative refractive power, an intermediate group consisting of a plurality of lens groups, and a final lens group having refractive power. During magnification change, a spacing between the first lens group and the intermediate group changes, a spacing between the intermediate group and the final lens group changes, and spacings between all adjacent lens groups in the intermediate group change. A focusing group that moves along an optical axis during focusing is disposed on the image side with respect to the first lens group. The variable magnification optical system satisfies predetermined conditional expressions.