Zoom Lens Aberration Correction via Multi-Group Segmentation
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Solution Overview
Problem
There is a demand for zoom lenses with higher zoom ratios that are compact and offer high optical performance, while existing lenses face challenges in achieving these requirements effectively.
Innovation Solution
A zoom lens configuration comprising a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a fourth lens group with positive refractive power, where specific conditional expressions are satisfied to optimize focal lengths and Abbe numbers, allowing for movement of lens groups along the optical axis to correct aberrations and maintain image quality across zoom ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a zoom lens is designed to achieve a higher zoom ratio, then the zoom capability is improved, but the lens size tends to increase
Solution Approach 1:
The zoom lens is divided into multiple lens groups (first through fourth lens groups) with different refractive powers, where each group can move independently along the optical axis. This segmentation allows the lens to achieve high zoom ratios through coordinated movement of smaller sub-groups rather than requiring a single large moving element, thus improving zoom capability while controlling overall lens size.
Solution Approach 2:
The lens groups are designed with dynamic movement capabilities along the optical axis during zooming operations. The first, second, third, and fourth lens groups move in specific patterns (with the second and fourth groups moving toward the image plane then toward the object) to dynamically adjust focal length and correct aberrations, enabling high zoom ratios in a compact configuration.
2Adaptability or versatility
If more lens groups are added to achieve higher zoom ratio, then zoom capability is improved, but device complexity increases
Solution Approach 1:
Each lens group serves multiple functions: the first lens group (positive power) contributes to zooming and wide-angle performance, the second lens group (negative power) enables telephoto extension and aberration correction, the third lens group (positive power) assists in focal length adjustment, and the fourth lens group (positive power) provides final image formation and aberration control. This multi-functionality of each group reduces the need for additional dedicated components.
Solution Approach 2:
The lens design utilizes specific conditional expressions involving focal lengths (f1, f2, fw, ft) and Abbe numbers to optimize the parameters of each lens group. By carefully controlling parameters such as the ratio of negative to positive focal lengths and selecting materials with appropriate Abbe numbers, the complex multi-group structure achieves high zoom ratios while maintaining manufacturability and performance.
3Adaptability or versatility
If lens groups move extensively to achieve high zoom ratio, then zoom capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes specific conditional expressions that constrain the focal length ratios and Abbe numbers of the lens groups. These parameter constraints are designed to ensure that the lens groups can achieve high zoom ratios through movement while maintaining reasonable positioning tolerances. The conditional expressions optimize the optical parameters to balance zoom capability with manufacturability and assembly precision requirements.
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 solution enables the creation of zoom lenses with higher zoom ratios that are compact and provide high optical performance, effectively correcting various aberrations and maintaining image quality from wide-angle to telephoto end states, thus meeting the demand for improved zoom capabilities and size efficiency.
Implementation Method 1
a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power
Data Source
AI summary
A zoom lens including, in order from an object: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, wherein when f2 denotes a focal length of the second lens group, andfw denotes a focal length of the zoom lens in the wide-angle end state, the following conditional expression being satisfied:1.90<(−f2)/fw<3.00.