Zoom Optical System Compact Design Aberration Control
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Solution Overview
Problem
Existing zoom optical systems face challenges in achieving a compact, high-performance design that balances miniaturization and optical performance while maintaining an appropriate angle of field and aberration correction, particularly at the wide-angle end.
Innovation Solution
The zoom optical system comprises a negative refractive power first lens unit, a positive refractive power second lens unit, and a positive refractive power third lens unit, with specific conditions on radius of curvature and focal length ratios to optimize miniaturization and aberration correction, including the use of aspherical surfaces and aperture stops to control aberrations and reduce the system's diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a negative refractive power first lens unit is used to reduce the optical system diameter, then the system diameter is reduced, but the angle of field and aberration correction become difficult to maintain
Solution Approach 1:
The patent applies local quality by giving different surface curvatures to different regions of the first lens unit. Specifically, the object-side surface has a positive radius of curvature while the image-side surface has a negative radius of curvature, creating an asymmetric meniscus shape that locally optimizes both miniaturization and aberration correction in different zones of the lens.
Solution Approach 2:
The patent changes the curvature parameters of the first lens unit surfaces to resolve the contradiction. By setting the object-side surface radius of curvature r1GF and image-side surface radius of curvature r1GR within specific ranges, the system achieves both reduced diameter and maintained aberration correction performance.
2Length of moving object
If the first lens unit is miniaturized with a negative lens, then the system becomes more compact, but the angle of field at the wide-angle end becomes difficult to secure
Solution Approach 1:
The patent uses curved surfaces with specific radii of curvature to achieve both compactness and wide angle of field. The first lens unit's object-side surface has a positive radius of curvature and the image-side surface has a negative radius of curvature, creating an optimized meniscus shape that maintains wide-angle performance while reducing overall system length.
3Area of stationary object
If the zoom optical system is designed to be compact, then the system diameter is reduced, but the optical performance and aberration correction deteriorate
Solution Approach 1:
The patent applies local quality by optimizing the surface curvatures of the first lens unit. The object-side surface has a positive radius of curvature and the image-side surface has a negative radius of curvature, creating an asymmetric meniscus shape that locally optimizes both compactness and optical performance in different regions of the lens.
Solution Approach 2:
The patent uses composite lens design combining multiple lens units with different refractive powers and surface curvatures. The first lens unit with its specific meniscus shape is combined with subsequent lens units to achieve both compact overall diameter and high optical performance through the composite arrangement.
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 results in a compact, high-performance zoom optical system that effectively balances miniaturization and optical performance, ensuring a satisfactory angle of field and aberration correction across the zoom range, particularly at the wide-angle end.
Implementation Method 1
a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power
Implementation Method 2
the first lens unit being constituted of a biconcave negative lens, the zoom optical system satisfies the following condition (1): (−3.0<r1GF+r1GR)/(r1GF−r1GR)<0.3
Data Source
AI summary
A zoom optical system comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power, a space between the lens units being changed to thereby perform zooming and focusing, wherein the first lens unit is constituted of a negative lens.