Variable Magnification Optics With Dynamic Lens Spacing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing variable magnification optical systems face challenges in achieving a compact configuration with a small F-number and maintaining good optical performance throughout the magnification change range.
Innovation Solution
A variable magnification optical system comprising a front group with two or fewer positive refractive power lens groups, an intermediate group with two or fewer negative refractive power lens groups, and a rear group with multiple lens groups, where spacings between adjacent lens groups change during magnification, adhering to specific conditional expressions to ensure compactness and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical system uses more lens groups to maintain good optical performance, then the optical performance is improved, but the system size and complexity increase
Solution Approach 1:
The optical system is divided into three functional groups (front group with positive refractive power, intermediate group with negative refractive power, and rear group with positive refractive power), each performing specific optical functions. This segmentation allows the system to achieve good optical performance through coordinated action of simplified sub-groups rather than requiring many complex lens elements throughout the entire system.
Solution Approach 2:
The patent employs conditional expressions that define specific ranges for focal lengths, refractive powers, and spacing relationships between lens groups. By optimizing these parameters within defined ranges, the system achieves good optical performance with a compact configuration, avoiding the need for excessive lens groups while maintaining image quality across the zoom range.
2Length of moving object
If the optical system is made compact by reducing lens groups, then the system size is reduced, but maintaining small F-number and good optical performance becomes difficult
Solution Approach 1:
The optical system is designed with variable spacings between lens groups that change dynamically during magnification adjustment. All spacings of adjacent lens groups are configured to change during zoom operation, allowing the system to maintain a compact form factor while adjusting the effective focal length to achieve small F-number values across the entire magnification range.
Solution Approach 2:
The patent defines conditional expressions that establish relationships between focal lengths, refractive powers, and spacing parameters. By optimizing these parameters within specific ranges, the system achieves a compact configuration that simultaneously maintains small F-number values and good optical performance, resolving the contradiction between size reduction and illumination quality.
3Length of moving object
If the optical system is made compact with fewer lens groups, then the system size is reduced, but maintaining good optical performance throughout the magnification change range becomes difficult
Solution Approach 1:
The optical system is divided into three functional groups (front group with positive refractive power, intermediate group with negative refractive power, and rear group with positive refractive power), each performing specific optical functions. This segmentation allows the system to achieve good optical performance through coordinated action of simplified sub-groups rather than requiring many complex lens elements throughout the entire system.
Solution Approach 2:
The optical system is designed with variable spacings between lens groups that change dynamically during magnification adjustment. All spacings of adjacent lens groups are configured to change during zoom operation, allowing the system to maintain a compact form factor while adjusting the effective focal length to achieve small F-number values across the entire magnification range.
4Device complexity
If the optical system uses a compact configuration with limited lens groups, then the system complexity is reduced, but achieving small F-number across the magnification range becomes difficult
Solution Approach 1:
The patent defines conditional expressions that establish relationships between focal lengths, refractive powers, and spacing parameters. By optimizing these parameters within specific ranges, the system achieves a compact configuration that simultaneously maintains small F-number values and good optical performance, resolving the contradiction between size reduction and illumination quality.
Solution Approach 2:
The optical system is designed with variable spacings between lens groups that change dynamically during magnification adjustment. All spacings of adjacent lens groups are configured to change during zoom operation, allowing the system to maintain a compact form factor while adjusting the effective focal length to achieve small F-number values across the entire magnification range.
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 design with a small F-number and maintains good optical performance across the entire magnification range, enhancing imaging quality and reducing size.
Implementation Method 1
a front group GF, an intermediate group GM, and a rear group GR in this order from the object side to the image side... a lens group having a positive refractive power... a lens group having a negative refractive power
Data Source
AI summary
A variable magnification optical system consists of, a front group, an intermediate group, and a rear group in this order from an object side. The front group consists of two or fewer lens groups having a positive refractive power. The intermediate group consists of two or fewer lens groups having a negative refractive power. The rear group consists of a plurality of lens groups. All spacings between adjacent lens groups are changed during magnification change. The variable magnification optical system satisfies predetermined conditional expressions.