High Power Zoom Lens System with Floating Mode Aberration Control
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Solution Overview
Problem
High power zoom lens systems for television and video cameras face challenges in achieving high magnification without increasing the total optical system length, while maintaining excellent optical performance by suppressing spherical and comatic aberrations during zooming.
Innovation Solution
A high power zoom lens system configured with five lens groups, where the first lens group remains stationary, the second lens group moves during zooming, and the third and fourth lens groups, which are movable relative to each other, correct image plane variations. The fourth lens group includes aspheric surfaces for enhanced aberration correction, employing a floating mode to minimize aberration variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If magnifying power is increased to achieve high power zoom, then zoom ratio is improved, but total length of optical system increases
Solution Approach 1:
The patent employs a floating mode mechanism where the third and fourth lens groups move relative to each other during zooming. This dynamic adjustment allows the lens groups to pass through -1× magnification points simultaneously, enabling high magnifying power (20× or higher) while maintaining a constrained total optical system length. The relative movement between lens groups optimizes the optical path without requiring proportional increases in overall system length.
Solution Approach 2:
The patent changes the magnification parameters of the lens groups during zooming by controlling their relative positions. By adjusting the object distance and image distance parameters dynamically, the system achieves high power zoom ratios while keeping the physical dimensions compact. The floating mode specifically adjusts the magnification distribution between the third and fourth lens groups to maintain optimal performance across the zoom range.
2Power
If magnifying power is increased to achieve high power zoom, then zoom ratio is improved, but spherical aberration and comatic aberration variation deteriorates
Solution Approach 1:
The floating mode mechanism dynamically adjusts the relative positions of the third and fourth lens groups during zooming. This dynamic control ensures that both lens groups pass through their respective -1× magnification points simultaneously at specific zoom positions, which stabilizes the optical path and minimizes aberration variations. The coordinated movement maintains consistent optical performance across the high zoom ratio range.
Solution Approach 2:
The patent implements an interlocking mechanism between the third and fourth lens groups where their movements are coordinated based on the zoom position. This feedback-controlled relative movement ensures that aberration correction is maintained throughout the zooming process. The system automatically adjusts the spacing between lens groups to compensate for aberration changes, keeping spherical and comatic aberrations within acceptable limits.
3Power
If five lens groups are used to achieve high power with compact size, then device complexity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the optical system into five distinct lens groups with specific functions: the first lens group for initial focusing, the second for zooming, the third and fourth for floating mode aberration correction, and the fifth for final image formation. This segmentation allows each group to be optimized independently for its specific function, simplifying the manufacturing process for each component while achieving the overall high power zoom capability.
Solution Approach 2:
The third and fourth lens groups serve multiple functions: they participate in zooming operations, perform floating mode movement for aberration correction, and contribute to overall focusing. This multi-functionality reduces the need for additional dedicated components, simplifying the overall manufacturing process while maintaining high performance across all operating modes.
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 a high power zoom lens system that achieves miniaturization with a high zoom ratio while effectively suppressing spherical and comatic aberrations, maintaining excellent optical performance throughout the zoom range.
Implementation Method 1
The fourth lens group has at least one aspheric surface
Implementation Method 2
The fourth lens group has at least one aspheric surface... providing an aspheric lens having a high aberration correction performance to the fourth lens group
Data Source
AI summary
A high power zoom lens system includes, in order from the object side: a first lens group having a positive refractive power and remaining stationary during zooming; a second lens group having a negative refractive power and moving during zooming; a third lens group and a fourth lens group having a positive refractive power and being movable relative to each other to correct image plane variation accompanied by zooming; and a fifth lens group having a positive refractive power and including an aperture diaphragm, the fifth lens group being used for forming an image. The second lens group and a composite lens group formed by combining the third lens group and the fourth lens group pass simultaneously through −1× magnification points of the groups during zooming from a wide-angle end to a telephoto end. The fourth lens group has at least one aspheric surface.