Zoom Lens Aberration Correction via Multi-Group Segmentation
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Solution Overview
Problem
Existing zoom lenses for digital cameras, interchangeable lens digital cameras, and cinematic cameras do not adequately correct various aberrations, particularly with the increasing number of pixels in these devices.
Innovation Solution
A zoom lens configuration comprising multiple lens groups with specific refractive powers and movements, including a first lens group moving towards the object side, and the second, third, fourth, fifth, and sixth lens groups adjusting their distances and positions to correct aberrations, with conditional formulas defining optimal focal length ratios and lens group movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing zoom lens configurations are used, then the lens system can be maintained at a manageable complexity, but various aberrations are not adequately corrected
Solution Approach 1:
The zoom lens is divided into six distinct lens groups (G1-G6) with specific refractive powers, where each group serves particular optical functions. The first lens group (G1) with positive refractive power handles initial light convergence, the second lens group (G2) with negative refractive power provides divergence control, and subsequent groups (G3-G6) with alternating positive and negative powers correct various aberrations. This segmentation allows independent optimization of each group's contribution to overall aberration correction while maintaining manageable system complexity.
Solution Approach 2:
Each lens group is assigned specific local optical properties: G1 and G3 have positive refractive powers for convergence, G2 and G5 have negative refractive powers for divergence control, G4 and G6 have positive powers for final image formation. The second lens group (G2) specifically includes a cemented lens structure with a negative lens and positive lens to correct chromatic aberrations locally. This local quality assignment enables targeted aberration correction at different positions in the optical path.
2Measurement precision
If the number of pixels in digital cameras is increased, then image resolution is improved, but aberration correction becomes more difficult to achieve
Solution Approach 1:
The zoom lens configuration serves multiple functions simultaneously: G1 and G3 provide primary convergence, G2 and G5 provide divergence control, G4 and G6 handle final image formation, and the cemented lens in G2 specifically addresses chromatic aberrations. This multi-functional design ensures that high-resolution imaging requirements are met while comprehensive aberration correction is achieved across the entire optical path, making the lens suitable for high-pixel-count digital cameras.
3Length of moving object
If a compact lens system is desired, then the total lens system length is reduced, but aberration correction performance may be compromised
Solution Approach 1:
The zoom lens employs dynamic movement of lens groups along the optical axis to achieve both compactness and aberration correction. When zooming from wide-angle to telephoto, G1 moves toward the object side while G2 moves toward the image side, and G3-G6 adjust their positions accordingly. This dynamic positioning allows the lens to maintain a relatively compact form factor while ensuring that each lens group is optimally positioned for aberration correction at different focal lengths.
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 proposed zoom lens effectively corrects various aberrations, ensuring high image quality and maintaining a compact lens system, particularly beneficial for non-reflex cameras by securing telecentric properties and shortening the total lens system length.
Implementation Method 1
a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group having a negative refractive power; and a sixth lens group having a positive refractive power
Data Source
AI summary
A zoom lens is constituted by, in order from the object side: a positive first lens group; a negative second lens group; a positive third lens group; a positive fourth lens group; a negative fifth lens group, and a positive sixth lens group. The distances among adjacent lens groups change when changing magnification from the wide angle end to the telephoto end. The first lens group is constituted by, in order from the object side, a negative lens, a positive lens, and a positive lens. The second lens group has a negative 2R lens group constituted by a cemented lens formed by cementing a negative lens and a positive lens, provided in this order from the object side, together, and a negative single lens. The fifth lens group is constituted by, in order from the object side, a negative lens, a negative lens, and a positive lens.