Variable Magnification Optical System Aberration Correction
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Solution Overview
Problem
Conventional variable magnification optical systems face challenges in achieving sufficient optical performance, particularly in correcting aberrations and addressing camera shake-induced imaging position displacement.
Innovation Solution
A variable magnification optical system comprising a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power, where the first lens group is divided into a front and rear group with negative and positive refractive powers respectively, and the system includes a vibration reduction mechanism by moving lens groups perpendicular to the optical axis, with specific focal length ratios and aspherical surfaces to correct aberrations and maintain image quality across varying magnifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional variable magnification optical system is used, then the system can achieve variable magnification, but it cannot attain sufficient optical performance in correcting aberrations
Solution Approach 1:
The optical system is divided into three distinct lens groups with specific refractive power characteristics. The first lens group has positive refractive power, the second has negative refractive power, and the third has positive refractive power. This segmentation allows each group to be optimized for specific functions: the first group for overall focusing, the second for aberration correction, and the third for image quality enhancement, thereby achieving superior optical performance while maintaining variable magnification capability.
Solution Approach 2:
The first lens group is further segmented into a front group with negative refractive power and a rear group with positive refractive power. This local differentiation within the first group enables precise control over aberration correction in different regions of the optical path, allowing the system to correct various types of aberrations (spherical, coma, astigmatism) effectively while maintaining the overall variable magnification function.
2Reliability
If conventional lens group configurations are used, then the system structure is simple, but camera shake-induced imaging position displacement cannot be effectively reduced
Solution Approach 1:
The patent implements a vibration reduction mechanism where the second lens group (with negative refractive power) is made movable relative to the first and third lens groups. This dynamic configuration allows the second lens group to be shifted in the optical axis direction to compensate for camera shake, thereby reducing imaging position displacement. The movability of the second lens group adds a degree of freedom that enables active vibration correction while maintaining the overall three-group structure.
3Manufacturing precision
If the optical system is designed for high aberration correction, then image quality is maintained, but the system becomes complex and difficult to manufacture
Solution Approach 1:
The three-lens group configuration is designed to perform multiple functions simultaneously: the first lens group handles focusing and provides overall optical power, the second lens group corrects aberrations and enables vibration reduction, and the third lens group enhances image quality and provides additional focusing capability. This multi-functionality across the lens groups allows the system to achieve high image quality and vibration reduction without requiring separate dedicated components for each function, thereby controlling overall system complexity.
Solution Approach 2:
The patent utilizes specific refractive power parameters for each lens group to optimize performance. The first lens group has positive refractive power, the second has negative refractive power, and the third has positive refractive power. By carefully selecting and adjusting these refractive power parameters, the system achieves effective aberration correction and vibration reduction while maintaining a manageable structure that is relatively easy to manufacture compared to systems with more lens elements or complex configurations.
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 system effectively corrects various aberrations and maintains image quality from infinite to close distances, while also reducing camera shake-induced displacement, achieving high optical performance and compact design.
Implementation Method 1
a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power
Implementation Method 2
said first lens group, said second lens group or at least a portion of said third lens group being moved in a direction having a directional component perpendicular to the optical axis as a vibration reduction lens group
Data Source
AI summary
A variable magnification optical system comprises, in order from an object side, a first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, and a third lens group (G3) having positive refractive power. The first lens group (G1) comprises a front group (G11) having negative refractive power and a rear group (G12) having positive refractive power. Focusing is carried out by moving the front group (G11). The first lens group (G1), the second lens group (G2) or at least a portion of the third lens group (G3) is moved in a direction having a directional component perpendicular to the optical axis as a vibration reduction lens group.