Variable-Power Optical System Relay Lens Group Segmentation
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Solution Overview
Problem
Existing variable-power optical systems are limited to a zoom ratio less than 4 times due to interference between lens groups, particularly at high magnification, which restricts the focal length of the relay optical system.
Innovation Solution
A variable-power optical system is designed with a relay optical system comprising a first lens group with positive refractive power, a second compensator lens group, and a third variator lens group, where the imaging magnification and focal length are optimized through specific conditional expressions to allow for a large zoom ratio without increasing the focal length, including a support mechanism and tilt mechanism for the lens groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the moving amount of the lens group in the relay optical system is increased to obtain a large zoom ratio, then the zoom ratio is improved, but the lens groups are easily interfered with each other, particularly in high magnification end state
Solution Approach 1:
The relay optical system is divided into three separate lens groups (first lens group with positive refractive power, second lens group with positive refractive power, and third lens group with positive refractive power) that can be independently positioned and moved. This segmentation allows each lens group to be optimized for specific functions while reducing interference between them, enabling a zoom ratio exceeding 4 times without increasing the focal length of the relay optical system.
Solution Approach 2:
The patent employs a dynamic positioning mechanism that allows the lens groups to move relative to each other along the optical axis during zooming operations. The system includes a support part for supporting the first lens group in a predetermined position and mechanisms to adjust the positions of the second and third lens groups, enabling smooth transitions between different magnification levels while maintaining optimal optical performance.
2Object-affected harmful factors
If the focal length of the relay optical system is increased to reduce lens group interference, then the interference is reduced, but the zoom ratio is limited to less than 4 times
Solution Approach 1:
The patent optimizes the focal lengths of the three lens groups (f1, f2, f3) by satisfying specific conditional expressions: 0.7 ≤ |β|min and 0.2 ≤ fmin/f1×f2/f3, where |β|min is the minimum of absolute value of imaging magnification of the relay optical system and fmin is the shortest focal length. By carefully adjusting these parameters, the system achieves a zoom ratio exceeding 4 times while keeping the focal length within acceptable ranges to minimize lens group interference.
3Measurement precision
If the moving amount of the lens group is increased to achieve high magnification, then the focal length becomes short, but the lens groups are easily interfered with each other
Solution Approach 1:
The relay optical system is divided into three separate lens groups (first lens group with positive refractive power, second lens group with positive refractive power, and third lens group with positive refractive power) that can be independently positioned and moved. This segmentation allows each lens group to be optimized for specific functions while reducing interference between them, enabling a zoom ratio exceeding 4 times without increasing the focal length of the relay optical system.
Solution Approach 2:
The patent employs a dynamic positioning mechanism that allows the lens groups to move relative to each other along the optical axis during zooming operations. The system includes a support part for supporting the first lens group in a predetermined position and mechanisms to adjust the positions of the second and third lens groups, enabling smooth transitions between different magnification levels while maintaining optimal optical performance.
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 large zoom ratio exceeding 4 times without increasing the focal length of the relay optical system, maintaining favorable aberration characteristics and ensuring a sufficient field of view and eye relief across the zoom range.
Implementation Method 1
a first lens group having positive refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power
Data Source
AI summary
A variable-power optical system includes, in order from an object, an objective optical system (O), a relay optical system (R), and an eyepiece optical system (E), wherein the relay optical system is provided with, in order from the object, a first lens group (G1) having positive refractive power, a second lens group (G2) having positive refractive power, and a third lens group (G3) having positive refractive power, and is an optical system in which an image formed by the objective optical system with variable optical power, and the variable-power optical system is configured so as to satisfy expressions: 0.7<|β|min<1.4, and 12 (mm)<fmin<15 (mm), where |β|min denotes a minimum of absolute value of imaging magnification of the relay optical system, and fmin denotes a shortest focal length.