Aspherical Lens Group Aberration Control in Zooming Optical Systems
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Solution Overview
Problem
Existing imaging optical systems face challenges in achieving good control over various aberrations, particularly during zooming and focusing operations.
Innovation Solution
The proposed imaging optical system includes a lens group Gm closest to the object, comprising a negative power lens element with an aspherical shape and at least two lens elements with power, which helps in minimizing aberrations during zooming and focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lens groups with negative power are used in zooming optical systems, then the basic zooming function is achieved, but various aberrations cannot be adequately controlled
Solution Approach 1:
The lens group with negative power is divided into multiple lens elements (at least three) with different functions. The first lens element has negative power for basic divergence, the second lens element has positive power for aberration correction, and the third lens element has negative power for additional refinement. This segmentation allows each element to address specific aberration types while maintaining the overall negative power function.
Solution Approach 2:
Each lens element within the negative power lens group is assigned specific optical properties and positions to correct particular aberrations. The first lens element handles primary divergence, the second lens element (with positive power) corrects specific aberrations like spherical aberration and coma, and the third lens element provides additional correction. This local optimization of each element's properties achieves comprehensive aberration control.
2Manufacturing precision
If lens elements are added to improve aberration control, then image quality is improved, but the number of components and system complexity increases
Solution Approach 1:
Multiple lens elements with different powers (negative and positive) are merged into a single functional lens group that maintains overall negative power. This combination allows the group to perform both the primary function of divergence (from negative elements) and aberration correction (from the positive element), achieving multiple functions without requiring separate lens groups for each purpose.
Solution Approach 2:
The lens group with negative power is designed to perform multiple functions simultaneously: primary light divergence (from the negative power requirement) and comprehensive aberration correction (through the combination of negative and positive power elements within the group). This multi-functionality reduces the need for additional dedicated correction groups, thereby limiting overall 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
This configuration enables the imaging optical system to maintain good control over various aberrations, resulting in improved image quality across different zoom and focus settings.
Implementation Method 1
lens element LGmF2 having the negative power, both surfaces of lens element LGmF2 having an aspherical shape
Implementation Method 2
both surfaces of lens element LGmF2 having an aspherical shape
Data Source
AI summary
An imaging optical system includes lens group Gm located on that is closest to an object among lens groups in which a distance between the lens groups changes during zooming, the lens groups having negative power. Lens group Gm includes, in order from the object side toward an image side, lens element LGmF1 having the negative power, lens element LGmF2 having the negative power, both surfaces of lens element LGmF2 having an aspherical shape, and at least two lens elements having power. The present disclosure provides the imaging optical system having good various aberrations such as spherical aberration, astigmatism, and distortion and an imaging device and a camera system that are provided with the imaging optical system.