Segmented Zoom Lens Architecture for Wide-Angle, High-Ratio Imaging
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Solution Overview
Problem
Existing zoom lenses face challenges in achieving a wide angle of view, high zoom ratio, compact size, and high optical performance while maintaining a lightweight design, particularly when attempting to increase the angle of view or zoom ratio, which often results in lens enlargement.
Innovation Solution
A zoom lens configuration with a first lens unit having a positive refractive power that does not move for zooming, three or more intermediate lens units that move during zooming, and a rear lens unit with a positive refractive power, where the aperture stop is positioned in the rear lens unit or adjacent to it, and specific focal length and refractive power inequalities are satisfied to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the angle of view or zoom ratio is increased, then the optical performance is improved, but the lens diameter increases and the size is enlarged
Solution Approach 1:
The zoom lens is divided into multiple lens units (first lens unit with positive refractive power, second lens unit with negative refractive power, and third lens unit with positive refractive power). Each lens unit can move independently during zooming, allowing the system to achieve high zoom ratios and wide angles of view without requiring a large overall lens diameter. The segmentation enables flexible optical path control while maintaining compact dimensions.
2Manufacturing precision
If the lens configuration is optimized for wide angle of view and high zoom ratio, then the optical performance is improved, but the lens unit diameter increases
Solution Approach 1:
The lens units are designed to move dynamically during zooming operations. The second lens unit with negative refractive power moves to adjust the focal length, enabling high zoom ratios. The first and third lens units with positive refractive power also move in coordination to maintain focus and correct aberrations. This dynamic configuration allows the lens to achieve high optical performance across the zoom range without requiring excessively large lens diameters.
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 a zoom lens with a wide angle of view, high zoom ratio, small size, and high optical performance, effectively addressing the challenges of lens enlargement and aberration control.
Implementation Method 1
a first lens unit having a positive refractive power
Implementation Method 2
three or more intermediate lens units that move during zooming, in which each interval between adjacent lens units changes during zooming
Implementation Method 3
the aperture stop is positioned in the rear lens unit or adjacent to it
Implementation Method 4
a second lens subunit having a positive refractive power that moves for focusing
Data Source
AI summary
A zoom lens includes, in order from object side, a positive first lens unit not moving for zooming, three or more intermediate lens units moving for zooming and a positive rear lens unit, in which each interval between adjacent lens units changes during zooming, an aperture stop is arranged in the rear lens unit, in a lens unit adjacent to the rear lens unit, or between the lens unit adjacent to the rear lens unit and the rear lens unit, the first lens unit includes, in order from the object side, negative subunit not moving for focusing, positive subunit moving for focusing, and positive subunit, a focal length of the first lens unit, a length on optical axis from most image-side surface to a rear principal point of the first lens unit, focal lengths of the zoom lens at wide angle end and at telephoto end are appropriately set.