Wide-Angle Lens Aberration Correction via Segmented Movable Groups
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Solution Overview
Problem
Conventional large aperture wide-angle lenses face challenges in correcting aberrations such as spherical aberration, astigmatism, and sagittal coma flare, particularly in achieving high optical performance while maintaining a large aperture and wide angle of view.
Innovation Solution
A wide-angle lens design comprising a first lens group with positive refractive power and a movable second lens group, including specific lens components with positive and negative refractive powers, where the focal length ratio of certain components is optimized to satisfy specific conditional expressions, effectively correcting spherical aberration and sagittal coma flare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional large aperture wide-angle lens design is used, then the lens can achieve large aperture and wide angle of view, but the aberrations such as spherical aberration, astigmatism, and sagittal coma flare cannot be adequately corrected
Solution Approach 1:
The lens is divided into multiple lens groups (first lens group with positive refractive power, second lens group with positive refractive power containing 2A, 2B, 2C, 2D components) that can move independently. This segmentation allows each group to be optimized for specific functions: the first group for wide angle and aperture, while the second group specifically addresses aberration correction through coordinated movement of its components during focusing.
Solution Approach 2:
The patent employs dynamic movement of lens components during focusing operations. The second lens group's components (2A, 2B, 2C, 2D) move in a coordinated manner to maintain optimal optical performance across different focus distances. This dynamic adjustment enables the lens to correct spherical aberration and sagittal coma flare effectively while maintaining large aperture capability.
2Manufacturing precision
If the lens design is optimized to correct aberrations, then optical performance improves, but the lens size increases
Solution Approach 1:
By segmenting the lens into functional groups, the patent achieves effective aberration correction without requiring a uniformly large lens structure. The second lens group, which handles correction functions, is designed to move in a specific pattern that maintains compact overall dimensions while providing the necessary correction capability.
Solution Approach 2:
The patent utilizes controlled changes in lens parameters during focusing operations. The conditional expression 0.4 < f23/f24 < 0.6 defines optimal focal length ratios that enable effective aberration correction within compact dimensions. This parameter optimization allows the lens to achieve high optical performance without excessive size increase.
3Manufacturing precision
If multiple lens components are added to correct aberrations, then optical performance improves, but the device complexity increases
Solution Approach 1:
The second lens group is designed as a multi-functional unit that simultaneously addresses multiple aberration types (spherical aberration, astigmatism, sagittal coma flare) through coordinated movement of its components. This universal approach allows a single lens group structure to perform multiple correction functions, reducing the need for additional separate correction elements and simplifying the overall device 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
The design achieves high optical performance with excellent correction of aberrations, allowing for a large aperture and wide angle of view without increasing lens size, thereby enhancing image quality in imaging apparatuses like single-lens reflex cameras.
Implementation Method 1
a first lens group having positive refractive power, and a second lens group having positive refractive power, the second lens group including, in order from the object, a 2A lens component having positive refractive power, a 2B lens component having negative refractive power, a 2C lens component having positive refractive power, and a 2D lens component having positive refractive power
Data Source
AI summary
Providing a large aperture wide-angle lens having high optical performance with sufficiently suppressed spherical aberration and sagittal coma flare, and an imaging apparatus using the lens. The lens including, in order from an object, a first lens group having positive refractive power, and a second lens group having positive refractive power, the second lens group being movable for focusing and including a 21 lens component having positive refractive power, a 22 lens component having negative refractive power, a 23 lens component having positive refractive power, and a 24 lens component having positive refractive power, and given conditions being satisfied.