Six-Group Zoom Lens Layout for Aberration Compensation
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Solution Overview
Problem
Existing imaging optical systems struggle to compensate for various types of aberrations effectively across the entire zoom range, leading to image quality degradation.
Innovation Solution
An imaging optical system comprising a specific arrangement of lens groups with varying refractive powers and movements along the optical axis, combined with image stabilizer lenses that move perpendicularly to the optical axis to compensate for camera shake and vibrations, thereby maintaining image clarity during zooming and focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional zoom lens structure with fewer lens groups is used, then the device complexity is reduced, but the ability to compensate for aberrations across the entire zoom range deteriorates
Solution Approach 1:
The zoom lens is divided into six distinct lens groups (G1-G6) with specific positive and negative refractive powers, arranged in sequence from the object side to the image plane. This segmentation allows each group to contribute differently to aberration compensation while maintaining overall system performance across the zoom range.
Solution Approach 2:
The intervals between adjacent lens groups are designed to change dynamically during zooming operations. By moving lens groups relative to each other along the optical axis, the system maintains optimal aberration compensation at different focal lengths, transforming a static structure into a dynamically adjustable optical system.
2Manufacturing precision
If the number of lens groups is increased to improve aberration compensation, then the manufacturing precision and image quality are improved, but the device complexity and structural arrangement become more complicated
Solution Approach 1:
Each lens group is assigned a specific refractive power (positive or negative) and positioned at a particular location within the optical system. This local differentiation allows each group to address specific types of aberrations, with the first through sixth lens groups collectively compensating for various optical imperfections across the zoom range.
Solution Approach 2:
The six-lens-group configuration serves multiple functions simultaneously: it provides zoom capability, compensates for spherical aberration, coma, astigmatism, and other optical imperfections, and maintains image quality across the entire focal length range. This multi-functional design reduces the need for additional specialized components.
3Manufacturing precision
If lens groups are arranged to compensate for aberrations at specific focal lengths, then the manufacturing precision is improved at those points, but the performance across the entire zoom range deteriorates
Solution Approach 1:
The intervals between lens groups are designed to change dynamically during zooming operations. By moving lens groups relative to each other along the optical axis, the system maintains optimal aberration compensation at different focal lengths, transforming a static structure into a dynamically adjustable optical system.
Solution Approach 2:
The optical parameters of the lens groups, particularly the intervals between them, are continuously adjusted as the zoom lens transitions between focal lengths. This parameter change ensures that aberration compensation remains effective across the entire zoom range rather than being optimized for a single focal length.
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 compensates for aberrations and image blur due to camera shake and vibrations, ensuring high image quality across the entire zoom range.
Implementation Method 1
a first lens group G1 having positive power; a second lens group G2 having negative power; a third lens group G3 having positive power; a fourth lens group G4 having positive power; a fifth lens group G5 having negative power; and a sixth lens group G6 having power
Implementation Method 2
combined with image stabilizer lenses that move perpendicularly to the optical axis to compensate for camera shake and vibrations
Data Source
AI summary
An imaging optical system includes: a first lens group having positive power; a second lens group having negative power; a third lens group having positive power; a fourth lens group having positive power; a fifth lens group having negative power; and a sixth lens group having power. The first, second, third, fourth, fifth, and sixth lens groups are arranged in this order such that the first lens group is located closest to an object and that the sixth lens group is located closest to an image plane. An interval between each pair of lens groups that are adjacent to each other changes as at least the first, second, third, fourth, fifth, and sixth lens groups move in an optical axis direction aligned with an optical axis of the imaging optical system while the imaging optical system is zooming.