Zoom Lens Miniaturization via Fourth Group Curvature Optimization
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Solution Overview
Problem
Conventional zoom lenses face challenges in miniaturization while maintaining high performance and correcting aberrations, often resulting in increased size due to complex lens configurations and a large number of lenses.
Innovation Solution
A zoom lens configuration comprising a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a fourth lens group with positive refractive power, where zooming is achieved by adjusting the air gap between the lens groups, and the fourth lens group includes a positive or negative lens component with a convex surface facing the object, optimizing focal lengths and radii of curvature to minimize size and aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If refractive power of each lens group is increased to implement miniaturization and higher performance, then the zoom lens size is reduced, but lens configuration becomes complicated and the number of constituting lenses increases, resulting in an increase in the size of the zoom lens
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and radii of curvature of the lens components. Specifically, it uses a fourth lens group with positive refractive power composed of multiple lens components with specific curvature relationships (Rc2-Rc1)/(Rc2+Rc1) to achieve miniaturization without increasing complexity. This allows the system to reduce overall size while maintaining performance through careful parameter selection rather than adding more lens elements.
Solution Approach 2:
The patent employs composite material principles by combining multiple lens components with different refractive properties in the fourth lens group. This group consists of a lens component with positive or negative refractive power, a positive lens component, and another positive lens component, creating a composite optical structure that achieves both miniaturization and aberration correction without simply adding more lens elements.
2Volume of moving object
If refractive power of each lens group is increased to implement miniaturization, then the zoom lens size is reduced, but the number of constituting lenses increases, resulting in an increase in the size of the zoom lens
Solution Approach 1:
The patent uses parameter changes to optimize the curvature radii of the lens components in the fourth lens group. By controlling the relationship between Rc1 and Rc2 (the radii of curvature of the object-side and image-side surfaces), the system achieves miniaturization with fewer lens elements. This allows reducing the quantity of lenses while maintaining compact size through optimized optical parameters.
3Reliability
If refractive power of each lens group is increased to achieve higher performance, then optical performance is improved, but lens configuration becomes complicated, resulting in increased aberrations
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and curvature radii of the lens components to achieve high optical performance with reduced complexity. The fourth lens group uses specific curvature relationships and refractive power distributions that correct aberrations more effectively than conventional designs, allowing higher performance without proportionally increasing complexity.
Solution Approach 2:
The patent employs composite material principles by creating a fourth lens group with multiple lens components having different refractive properties. This composite structure corrects optical aberrations more effectively than simple lens configurations, achieving higher optical reliability while keeping the overall system complexity manageable through intelligent design of the composite lens group.
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 results in a miniaturized zoom lens with a small number of lenses, high performance, and reduced aberrations, enabling a compact design without compromising optical quality.
Implementation Method 1
a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power
Implementation Method 2
a positive lens component having a convex surface facing the object
Data Source
AI summary
A zoom lens has, in order from an object, a first lens group (G1) having positive refractive power; a second lens group (G2) having negative refractive power; a third lens group (G3) having positive refractive power; and a fourth lens group (G4) having positive refractive power. Zooming is performed by changing an air gap between the lens groups. The fourth lens group (G4) includes, in order from the object, a lens component (La) having positive or negative refractive power, a positive lens component (Lb), and a positive lens component (Lc) having a convex surface facing the object. Specified conditional expressions are satisfied.