Zoom Lens Group Dynamics for Compact High Magnification
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Solution Overview
Problem
Existing zoom lenses with high magnification and wide imaging angles are not compact enough due to the need for multiple lens groups and long optical systems, which complicates manufacturing and increases size, making it difficult to achieve both high magnification and compactness.
Innovation Solution
A zoom lens configuration with specific refracting power arrangements and conditional expressions that optimize the movement of lens groups during zooming, including a first lens group with positive refracting power, a second with negative power, and a third with positive power, where the third lens group has at least two lenses and an air separation, and an f-number determination member, to maximize magnification changing ability while minimizing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of lenses or total length of the optical system is increased to increase the imaging angle or magnification factor, then the imaging angle and magnification factor are improved, but the device size and complexity increase
Solution Approach 1:
The patent optimizes the refracting power distribution among lens groups and the distance relationships between them (specifically satisfying 4.5 < D(T,2-3)/fW < 15) to achieve high magnification and wide imaging angle without increasing the number of lenses. This parameter optimization allows the optical system to achieve superior performance with fewer components.
Solution Approach 2:
The patent defines specific movement patterns for lens groups during zooming (first lens group moves away from second, third lens group approaches second, fourth lens group approaches third) to dynamically adjust the optical path and achieve variable magnification. This dynamic arrangement allows high magnification capability without requiring excessive lens travel distance.
2Adaptability or versatility
If the outer diameter of the lens closest to the object is increased to increase the imaging angle, then the imaging angle is improved, but the device size increases
Solution Approach 1:
Instead of increasing the outer diameter of the first lens group, the patent changes the refracting power parameters of the lens groups and optimizes the distance D(T,2-3) between the second and third lens groups. This parameter change approach achieves wide imaging angle without increasing the physical size of individual lens elements or the overall device.
3Adaptability or versatility
If the total length of the optical system is increased to achieve high magnification factor, then the magnification factor is improved, but the device length and compactness are worsened
Solution Approach 1:
The patent employs dynamic movement of lens groups during zooming operation, where the third lens group approaches the second lens group and the fourth lens group approaches the third lens group. This dynamic arrangement allows the optical system to achieve high magnification factor (greater than 10 times) while maintaining a compact total length by efficiently utilizing the travel distance of each lens group.
Solution Approach 2:
The patent optimizes the refracting power distribution and the critical distance parameter D(T,2-3) to achieve high magnification in a compact form. By carefully controlling the ratio D(T,2-3)/fW to be between 4.5 and 15, the system achieves extended magnification capability without proportionally increasing the optical system length.
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 achieves a high magnification factor, wide imaging angle, and compact size by optimizing the distance and refracting power of lens groups, ensuring sufficient magnification changing ability and preventing lens contact during use.
Implementation Method 1
a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power, a fourth lens group having positive refracting power, and a fifth lens group having positive refracting power arranged in this order from the object side toward the image side
Data Source
AI summary
A zoom lens includes: a first lens group having positive refracting power; a second lens group having negative refracting power; a third lens group having positive refracting power; a fourth lens group having positive refracting power; and a fifth lens group having positive refracting power arranged in this order from an object side toward an image side, wherein when the zoom lens undergoes zooming operation from a wide-angle end toward a telescopic end, the first lens group moves away from the second lens group toward an object to be imaged, the third lens group approaches the second lens group toward the object, and the fourth lens group approaches the third lens group toward the object, and the zoom lens satisfies the following conditional expression (1)4.5<100×D(T,2−3)/fW<15 (1).