Compact Zoom Lens with Segmented Groups for High Ratio
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Solution Overview
Problem
There is a demand for a zoom lens that is compact, has a high zoom ratio, and maintains favorable optical performance.
Innovation Solution
The zoom lens is configured with a front group, an intermediate group, and a rear group, where the front group has two or fewer positive refractive powers, the intermediate group has two or fewer negative refractive powers, and the rear group has multiple lens groups with specific refractive powers. During zooming, the spacings between adjacent lens groups change, and certain lens groups remain stationary with respect to the image plane, ensuring a compact design and high zoom ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a zoom lens is designed with a compact structure and high zoom ratio, then the size is reduced and zoom capability is improved, but optical performance deteriorates due to increased aberrations and difficulty in maintaining focus
Solution Approach 1:
The zoom lens is divided into three distinct groups (front group with positive refractive power, intermediate group with negative refractive power, and rear group with positive refractive power), each performing specific functions. This segmentation allows independent optimization of each group's movement and design, enabling compact overall size while maintaining optical performance through coordinated group movements during zooming and focusing operations.
Solution Approach 2:
The patent employs dynamic movement of lens groups during zooming and focusing. The front and intermediate groups move relative to each other for zooming, while the rear group remains stationary during zooming but moves for focusing. This dynamic configuration allows the lens to achieve high zoom ratio with compact size while maintaining focus and correcting aberrations across the zoom range.
2Volume of moving object
If the front group has strong positive refractive power to reduce size, then compactness is improved, but aberration correction becomes more difficult
Solution Approach 1:
Each lens group is designed with specific local optical properties: the front group has positive refractive power for compactness, the intermediate group has negative refractive power to counteract aberrations introduced by the front group, and the rear group has positive refractive power for final image formation. This local optimization of each group's refractive power and composition enables effective aberration correction while maintaining compact overall size.
3Adaptability or versatility
If multiple lens groups are used to achieve high zoom ratio, then zoom capability is improved, but the number of moving parts increases and mechanism complexity increases
Solution Approach 1:
The patent combines zooming and focusing functions into a coordinated system where the front and intermediate groups work together for zooming while the rear group handles focusing. By merging the zooming function into the front-intermediate group interaction and keeping the rear group stationary during zooming, the design achieves high zoom ratio with reduced mechanism complexity compared to traditional designs where all groups must move for zooming.
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 allows for a compact zoom lens with a high zoom ratio while maintaining favorable optical performance, including corrected various aberrations over a zoom range.
Implementation Method 1
a zoom lens consisting of, in order from an object side to an image side, a front group, an intermediate group, and a rear group... all spacings of adjacent lens groups change during zooming
Data Source
AI summary
The zoom lens consists of, in order from an object side to an image side, a front group, an intermediate group, and a rear group. The front group consists of two or fewer lens groups that have positive refractive powers. A lens group closest to the object side in the front group remains stationary with respect to an image plane during zooming. The intermediate group consists of two or fewer lens groups that have negative refractive powers. The rear group consists of a plurality of lens groups. A lens group closest to the object side in the rear group has a positive refractive power, and a lens group closest to the image side in the rear group remains stationary with respect to the image plane during zooming. During zooming, all the spacings of adjacent lens groups change. The zoom lens satisfies predetermined conditional expressions.