Zoom Lens Aberration Correction via Multi-Unit Segmentation
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Solution Overview
Problem
Existing wide-angle zoom lenses face challenges in correcting distortion and field curvature while maintaining manufacturing simplicity, as they often require complex aspherical surface lenses with high unevenness and large aperture diameters, leading to increased manufacturing difficulty.
Innovation Solution
A zoom lens configuration comprising a first negative lens unit, a positive second lens unit, a negative third lens unit, a negative fourth lens unit, and a positive fifth lens unit, where the second lens unit moves towards the object side during zooming, and the relative position accuracy of the second and fourth lens units is improved to correct field curvature and reduce optical performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If aspherical surface lenses with large unevenness and large aperture diameters are used in the first and second lens units, then distortion and field curvature are corrected well, but manufacturing difficulty increases significantly
Solution Approach 1:
The lens system is divided into multiple lens units with specific refractive powers arranged in sequence. Instead of using a single complex aspherical lens, the correction function is segmented across multiple lens elements (first negative lens unit, second positive lens unit, third negative lens unit, fourth negative lens unit, and fifth positive lens unit), where each lens contributes to correcting specific aberrations.
Solution Approach 2:
The patent changes the optical parameters by assigning specific refractive power values to each lens unit and controlling the object-side focal length ratio (fg1/fw) within -2.0 to -5.0. This parameter optimization allows distortion and field curvature correction without requiring extreme aspherical surface unevenness or large aperture diameters, thereby reducing manufacturing difficulty.
2Manufacturing precision
If the second lens unit moves to the object side during zooming, then the relative position accuracy between second and fourth lens units is improved, but the device complexity increases
Solution Approach 1:
The lens system employs dynamic movement of the second lens unit toward the object side during zooming operation. This dynamic adjustment allows the relative position accuracy between the second and fourth lens units to be improved, enabling better aberration correction across the zoom range while maintaining compact lens structure.
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 configuration effectively corrects various aberrations, including distortion and field curvature, while reducing manufacturing complexity and achieving a compact, high-performance wide-angle zoom lens with a low manufacturing difficulty.
Implementation Method 1
a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power
Data Source
AI summary
A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, a fourth lens unit having a negative refractive power, and a rear lens unit having a positive refractive power and disposed closest to an image plane. During zooming from a wide-angle end to a telephoto end, the second lens unit moves to the object side, and each distance between adjacent lens units changes. A predetermined condition is satisfied.