Variable Magnification Optical System Compact Design
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Solution Overview
Problem
Existing variable magnification optical systems face challenges in reducing size while maintaining favorable optical performance across the entire magnification range.
Innovation Solution
A variable magnification optical system is configured with a specific arrangement of lens groups, including a first lens group with positive refractive power, a second lens group with negative refractive power, an intermediate group, and a final lens group, where the intermediate group consists of two or more and five or fewer lens groups. The spacings between these groups change during magnification, and the system satisfies several conditional expressions to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lens groups in the intermediate group is increased to improve optical performance, then the optical performance is improved, but the size of the optical system increases
Solution Approach 1:
The patent applies parameter changes by carefully controlling the number of lens groups in the intermediate group to be 2-5 groups, and by optimizing the spacing relationships between lens groups during magnification changes. This allows the system to achieve favorable optical performance while maintaining a compact size, resolving the contradiction between performance and size through precise parameter optimization.
2Adaptability or versatility
If the spacing between lens groups is adjusted to change magnification, then the magnification is variable, but the complexity of the system increases
Solution Approach 1:
The patent divides the optical system into distinct lens groups (first lens group, second lens group, intermediate group with 2-5 lens groups, and final lens group), where each group can move independently to change spacings during magnification. This segmentation allows variable magnification functionality while managing system complexity through modular design.
Solution Approach 2:
The patent implements dynamic spacing adjustment between lens groups during magnification changes. The spacings between the first and second lens groups, between the second lens group and intermediate group, between the intermediate group and final lens group, and all spacings within the intermediate group all change dynamically, enabling variable magnification while maintaining manageable complexity through controlled dynamic behavior.
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 reduction in size while maintaining excellent optical performance throughout the entire magnification range, effectively addressing the demands for smaller and more efficient optical systems.
Implementation Method 1
a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an intermediate group GM, and a final lens group GE having a refractive power
Data Source
AI summary
A variable magnification optical system consists of, in order from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, an intermediate group consisting of two or more and five or fewer lens groups, and a final lens group having a refractive power. During changing magnification, a spacing between the first lens group and the second lens group changes, a spacing between the second lens group and the intermediate group changes, a spacing between the intermediate group and the final lens group changes, and all spacings between adjacent lens groups in the intermediate group change. The variable magnification optical system satisfies a predetermined conditional expression.