Zoom Lens System Miniaturization via Segmented Refractive Groups
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Solution Overview
Problem
Existing zoom lens systems face challenges in achieving high optical performance and miniaturization while maintaining low manufacturing costs, making it difficult to satisfy both high magnification and high-resolution requirements simultaneously.
Innovation Solution
A two-group zoom lens system is designed with specific refractive power distributions and lens configurations, including a first lens group with negative refractive power and a second lens group with positive refractive power, allowing for zooming by adjusting the distance between the groups, and incorporating aspherical surfaces to correct aberrations from visible light to near-infrared regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a lens system is miniaturized to improve convenience, then the size is reduced, but manufacturing costs increase and high optical performance becomes difficult to achieve
Solution Approach 1:
The lens system is divided into two distinct groups: a first lens group with negative refractive power and a second lens group with positive refractive power. This segmentation allows for optimized design of each group independently, achieving miniaturization while maintaining manufacturability and optical performance through specialized lens configurations in each group.
Solution Approach 2:
The patent applies specific parameter constraints to achieve the desired balance: |f1/fw|≥2.5, 0.60≤|f1/f2|<0.85, and Tw/D≤3.5. These parameter changes define the focal length relationships and total length constraints that enable miniaturization while controlling manufacturing complexity and cost.
2Volume of moving object
If the lens system is miniaturized to improve convenience, then the size is reduced, but optical performance such as magnification and resolution deteriorates
Solution Approach 1:
By segmenting the lens system into two functional groups with opposite refractive powers, the patent achieves compact size while each group contributes to overall optical performance. The negative power group diverges light to enable wide-angle viewing, while the positive power group converges light for imaging, together providing high magnification and resolution in a miniaturized form.
Solution Approach 2:
The lens system employs a composite configuration combining lenses with different refractive power signs (negative and positive groups) and potentially different material properties. This composite approach allows the system to achieve superior optical performance including high magnification and resolution while maintaining a compact form factor.
3Measurement precision
If aberration correction is improved to achieve high resolution, then optical performance increases, but the lens system becomes more complex and difficult to manufacture
Solution Approach 1:
The segmentation into two lens groups with opposite refractive powers provides inherent aberration correction capabilities. The negative power group can correct for certain types of aberrations introduced by the positive power group, and vice versa, achieving high resolution without requiring excessive lens elements or complex arrangements.
Solution Approach 2:
The patent employs specific parameter constraints including focal length ratios (|f1/fw|≥2.5, 0.60≤|f1/f2|<0.85) and total length constraints (Tw/D≤3.5) that define an optimized parameter space. These parameter changes establish a balanced configuration that achieves effective aberration correction and high resolution while controlling system complexity.
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 system achieves miniaturization, high resolution, and effective aberration correction across the visible and near-infrared spectrum, enabling high-quality imaging without modifying the internal structure of the device, suitable for both daytime and nighttime use.
Implementation Method 1
a first lens group (10) having a negative refractive power and a second lens group (20) having a positive refractive power, wherein the zoom lens system performs zooming by changing a distance between the first lens group (10) and the second lens group (20)
Implementation Method 2
incorporating aspherical surfaces to correct aberrations from visible light to near-infrared regions
Data Source
AI summary
A zoom lens system that includes a first lens group including at least one lens and having a negative refractive power, and a second lens group including at least one lens and having a positive refractive power in an order from an object side to an image side, wherein the zoom lens system is configured to perform zooming by changing a distance between the first lens group and the second lens group and satisfies: 2<|f1/fw|<2.5 and 0.60<|f1/f2|<0.85, wherein f1 indicates a synthetic focal length of the first lens group, fw indicates an overall focal length at a wide angle end, and f2 indicates a synthetic focal length of the second lens group.