Zoom Lens With Meniscus Negative Lenses for Wide-Angle Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a demand for a zoom lens that provides a large image circle, wide angle of view, and small size with favorable optical performance, which is not adequately met by existing technologies.
Innovation Solution
A zoom lens configuration with a first lens group having a positive refractive power, a middle group comprising multiple lens groups, and a final lens group, where spacings between adjacent lens groups change during magnification, including two negative lenses with specific refractive power conditions and focal length ratios, and a meniscus lens design to achieve a wide angle and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a zoom lens is designed with a large image circle and wide angle, then the imaging coverage is improved, but the lens size increases
Solution Approach 1:
The lens is divided into multiple lens groups (first lens group, second lens group, third lens group, fourth lens group) with different refractive powers and characteristics. Each group is responsible for specific optical functions, allowing the system to achieve large image circle and wide angle without excessive size increase through coordinated design of segmented components
Solution Approach 2:
The patent employs specific refractive index ranges and Abbe number constraints for each lens group to optimize optical performance. By carefully selecting and changing material parameters within defined ranges, the lens achieves favorable optical characteristics while maintaining compact size
2Device complexity
If the lens structure is simplified to reduce size, then the lens weight and complexity are reduced, but optical performance deteriorates
Solution Approach 1:
Different lens groups are assigned specific local functions with optimized characteristics. The first lens group has positive refractive power for light convergence, the second group has negative refractive power for divergence control, the third group has positive refractive power for additional convergence, and the fourth group has negative refractive power for final divergence control. This local optimization ensures good optical performance while maintaining relatively simple overall structure
Solution Approach 2:
The lens combines multiple lens groups with different refractive powers and material characteristics in a single compact structure. By integrating these composite elements, the patent achieves favorable optical performance without requiring excessive complexity
3Reliability
If the first lens group includes two negative lenses with specific configuration, then aberration is suppressed and optical performance is improved, but the lens weight increases
Solution Approach 1:
The patent specifies precise parameter ranges for the negative lenses including refractive index (1.50-1.70), Abbe number (20-40), and thickness ratios. By optimizing these parameters, the lens achieves aberration suppression while minimizing weight increase
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 large image circle, wide angle, and small size while maintaining favorable optical performance by suppressing various aberrations and reducing weight, thereby enhancing imaging capabilities.
Implementation Method 1
a first lens group having a positive refractive power that is disposed closest to an object side; a middle group that includes a plurality of lens groups; and a final lens group that is disposed closest to an image side, in which all of spacings between adjacent lens groups change during changing magnification
Data Source
AI summary
A zoom lens includes: a first lens group having a positive refractive power that is disposed closest to an object side; a middle group that includes a plurality of lens groups; and a final lens group that is disposed closest to an image side. All of spacings between adjacent lens groups change during changing magnification. The first lens group includes two negative lenses consecutively arranged in order from a position closest to the object side to the image side, and among the two negative lenses, a negative lens closer to the object side is a meniscus lens that has a convex surface facing the object side. The zoom lens satisfies Conditional Expression of 0.1<fw/f1<0.8 regarding a focal length f1 of the first lens group and a focal length fw of the zoom lens at a wide angle end.