Zoom Lens Aberration Control via Multi-Unit Movement
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Solution Overview
Problem
Conventional four-unit zoom lenses face challenges in achieving compatibility between wide angle, high magnification, and reduced size and weight, leading to increased variations in aberrations, especially at the wide-angle and telephoto ends, with existing solutions failing to effectively correct aberrations in the intermediate zoom state.
Innovation Solution
A zoom lens configuration with a first fixed positive refractive power unit, a movable second lens unit, a movable third lens unit with both positive and negative refractive powers, and a fixed fourth lens unit, where the second and third lens units move from the object side to the image side during zooming, adhering to specific conditional expressions to optimize the interval ratio and refractive power ratios, allowing for arbitrary movement loci and effective aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the refractive powers of the lens units are increased to achieve wider angle and higher magnification, then the angle of view and magnification are improved, but the variations in aberrations increase
Solution Approach 1:
The zoom lens is divided into four distinct lens units with specific refractive power configurations (positive, negative, positive, negative). Each lens unit is independently designed and can be moved separately during zooming, allowing precise control over aberration correction while maintaining wide angle and high magnification capabilities
Solution Approach 2:
The second, third, and fourth lens units are configured to be movable during zooming operations. By dynamically adjusting the positions of these lens units according to specific movement loci, the system can correct aberrations at different focal lengths while maintaining the desired wide angle and high magnification performance
2Manufacturing precision
If three or four zooming units are moved with different loci to correct aberrations, then aberration correction is improved, but the device complexity increases
Solution Approach 1:
The second lens unit serves multiple functions: it acts as a variator for zooming and simultaneously contributes to aberration correction through its specific movement locus. This multi-functionality reduces the need for additional dedicated correction mechanisms, thereby limiting the increase in device complexity while achieving effective aberration correction
3Adaptability or versatility
If a four-unit zoom lens configuration is used to achieve wide angle and high magnification, then the angle of view and magnification are improved, but the size and weight increase
Solution Approach 1:
The patent employs specific conditional expressions that define relationships between focal lengths, movement distances, and refractive powers of the lens units. By optimizing these parameters within defined ranges, the system achieves wide angle and high magnification while controlling the overall size and weight of the lens assembly
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 achieves a zoom lens with wide angle, high magnification, reduced size and weight, and improved optical performance across the entire focal length range, effectively correcting aberrations and maintaining high performance even at the telephoto end.
Implementation Method 1
a first lens unit having a positive refractive power and configured not to be moved for zooming
Implementation Method 2
a second lens unit having a negative refractive power and configured to be moved for zooming
Implementation Method 3
a third lens unit having a positive refractive power and configured to be moved for zooming
Implementation Method 4
a fourth lens unit having a negative refractive power and configured to be moved for zooming
Data Source
AI summary
A zoom lens including, in order from an object side, a positive first unit configured not to be moved for zooming, a negative second unit configured to be moved for zooming, a positive third unit configured to be moved for zooming, a zooming lens group including a lens unit and configured to be moved for zooming, and a positive unit configured not to be moved for zooming, wherein the third unit includes positive and negative lenses, the second and third units move to an image side for zooming from a wide-angle end to a telephoto end, and focal lengths at the wide-angle end and the telephoto end, a zoom ratio, a space between the second unit third units and is maximum in a zoom range from the telephoto end to a predetermined focal length, and a space between the second third units at the telephoto end are properly set.