Variable Magnification Optical System Fifth Lens Group Aberration Control
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Solution Overview
Problem
Conventional multi-group zoom lenses have unevenly set variable magnification ratios among lens groups, leading to inadequate optical performance due to high magnification ratios in specific groups and low ratios in others, which complicates aberration correction.
Innovation Solution
A variable magnification optical system with six lens groups, where the fifth lens group's magnification ratio is set between 0.65 and 3.20, and other groups are arranged to satisfy specific conditional expressions for focal lengths and distances, ensuring balanced magnification and aberration correction across all lens groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high variable magnification ratio is set for specific lens groups in conventional multi-group zoom lenses, then variable magnification can be implemented, but optical performance deteriorates due to inadequate aberration correction
Solution Approach 1:
The patent applies parameter changes by precisely controlling the variable magnification ratio of the fifth lens group within the range 0.65 < β5T/β5W ≤ 3.20. This parameter optimization ensures that each lens group contributes appropriately to the overall variable magnification while maintaining balanced aberration correction across all groups, thereby improving optical performance without sacrificing variable magnification capability.
2Ease of manufacture
If variable magnification ratio of fifth lens group is not properly set, then manufacturing is simplified, but optical performance deteriorates due to unbalanced magnification distribution
Solution Approach 1:
The patent establishes a specific parameter range for the fifth lens group's variable magnification ratio (0.65 < β5T/β5W ≤ 3.20) that optimizes the balance between manufacturing feasibility and optical performance. This parameter specification guides the design process to achieve proper magnification distribution across all lens groups while maintaining reasonable manufacturing complexity.
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
This configuration allows for proper setting of variable magnification ratios in each lens group, enhancing optical performance by effectively correcting spherical aberration, coma, and curvature of field, while maintaining a compact system size.
Implementation Method 1
the fifth lens group satisfies the following conditional expression: 0.65 < β5T/β5W ≤ 3.20, wherein β5T denotes a lateral magnification at a telephoto end state and β5W denotes a lateral magnification at a wide-angle end state
Implementation Method 2
enhancing optical performance by effectively correcting spherical aberration, coma, and curvature of field
Implementation Method 3
enhancing optical performance by effectively correcting spherical aberration, coma, and curvature of field
Implementation Method 4
enhancing optical performance by effectively correcting spherical aberration, coma, and curvature of field
Data Source
AI summary
Provided are a variable magnification optical system for making it possible to properly set a variable magnification ratio of each lens group by properly setting a variable magnification ratio of a fifth lens group, and an optical apparatus with the variable magnification optical system, and a method for manufacturing the variable magnification optical system. The optical apparatus has first to sixth lens groups (G1) to (G6) in order from an object, wherein the fifth lens group (G5) satisfies the following conditional expression: 0.65<|β5T/β5W|<3.20, where β5T denotes the lateral magnification at the telephoto end state, and β5W denotes the lateral magnification at the wide-angle end state.