Imaging Optical System Lens Group Configuration for Blur Correction
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Solution Overview
Problem
Conventional imaging optical systems face challenges in effectively correcting image blur caused by camera shake or vibration, particularly during zooming from wide to telephoto ends, due to inadequate aberration correction and complex lens barrel configurations.
Innovation Solution
The proposed imaging optical system includes a configuration with a first lens group having positive power, a second lens group with negative power, and a third lens group with positive power, where the third lens group features lenses with specific power distributions and aspherical surfaces, and the lens L3R1 moves perpendicular to the optical axis to correct image blur. During zooming, the second and third lens groups move along the optical axis, adjusting their distance to optimize aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple lens groups are moved during zooming to correct aberrations, then image quality is improved, but the lens barrel structure becomes more complex
Solution Approach 1:
The lens system is divided into multiple lens groups (first lens group with positive power, second lens group with negative power, third lens group with positive power, and succeeding lens groups) that can move independently relative to each other during zooming. This segmentation allows each group to be optimized for specific aberration corrections while simplifying the overall control mechanism compared to moving all lenses simultaneously.
Solution Approach 2:
The third lens group serves multiple functions: it contributes to zooming by moving relative to the second lens group, and it contains lens L3R1 that can move perpendicular to the optical axis to correct image blur. This multi-functionality reduces the need for separate dedicated components, thereby simplifying the lens barrel structure while maintaining effective aberration correction.
2Reliability
If lens L3R1 moves perpendicular to the optical axis to correct image blur, then image blur correction is improved, but eccentric comatic aberration increases
Solution Approach 1:
Lens L3R1 within the third lens group is given the specific property of moving perpendicular to the optical axis for image blur correction, while other lenses maintain different movement characteristics. This localized quality assignment allows effective blur correction while the overall lens group configuration compensates for the introduced eccentric comatic aberration.
Solution Approach 2:
The third lens group contains an asymmetric arrangement of lenses with different powers (L3F1, L3F2 with positive power; L3R1, L3R2 with positive power; L3R3 with negative power) where L3R1 is positioned and configured to move perpendicular to the optical axis. This asymmetric design enables effective image blur correction while the surrounding symmetric lens configuration helps balance the eccentric comatic aberration.
3Manufacturing precision
If the distance between second lens group and third lens group changes during zooming, then aberration correction is improved, but the number of cam configurations increases
Solution Approach 1:
The zooming movement that changes the distance between the second lens group and third lens group is combined with the movement of other lens groups into a coordinated system. By merging the zooming function with the relative positioning of multiple lens groups, the patent reduces the need for separate cam configurations for each distance adjustment, thereby simplifying the mechanical structure while maintaining effective aberration correction.
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 effectively reduces eccentric comatic aberration and prevents degradation of image performance, enabling precise image blur correction and simplifying the lens barrel structure by reducing the number of cam configurations required for zooming.
Implementation Method 1
The lens L3R1 moves in a direction perpendicular to an optical axis to optically correct image blur
Implementation Method 2
the third lens group features lenses with specific power distributions and aspherical surfaces
Implementation Method 3
One of optical surfaces of each of the lens L3R3 and the lens L3R2 are bonded to each other
Data Source
AI summary
An imaging optical system of the present disclosure includes a first lens group having positive power, a second lens group having negative power, a third lens group having the positive power, and a succeeding lens group including one or more lens groups in order from an object side toward an image side. The third lens group includes a lens having the positive power and a lens having the positive power in order from the object side toward the image side, and includes a lens L3R1 having the positive power, a lens L3R2 having the positive power, and a lens L3R3 having the negative power in order from the image side toward the object side. The lens L3R2 and the lens L3R3 are bonded, the lens L3R1 moves to optically correct image blur, and at least a distance between the second lens group and the third lens group changes during zooming from a wide angle end to a telephoto end.