Zoom Lens Compact Size Aberration Correction
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Solution Overview
Problem
There is a demand for a zoom lens that is compact in size while maintaining favorable optical characteristics, which existing zoom lenses have not adequately addressed.
Innovation Solution
A zoom lens configuration comprising a specific arrangement of lens groups with varying refractive powers, where certain lens groups remain stationary while others move along the optical axis to adjust focal length, incorporating conditional expressions to optimize optical performance and size reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens system is designed to be compact in size, then the overall dimensions are reduced, but the optical characteristics (aberration correction) deteriorate
Solution Approach 1:
The lens system is divided into five distinct lens groups (first through fifth lens groups) with specific refractive power assignments. Each group can move independently along the optical axis during zooming, allowing optimized aberration correction for each segment while maintaining overall compactness. This segmentation enables precise control over optical characteristics without increasing overall system size.
Solution Approach 2:
The patent employs dynamic movement of lens groups along the optical axis during zooming operations. The first lens group moves during focusing while the second through fifth lens groups remain stationary during focusing, and various groups move along the optical axis during zooming from wide angle to telephoto end. This dynamic repositioning allows the system to maintain optimal optical characteristics across different focal lengths while preserving a compact form factor.
2Manufacturing precision
If lens groups are positioned to optimize optical performance, then aberration correction is improved, but the lens system size increases
Solution Approach 1:
Each lens group is assigned specific local functions with optimized positions and movements. The first lens group handles focusing with stationary image surface, the second through fifth lens groups handle zooming with specific movement patterns. This localized optimization of optical quality in each segment allows excellent aberration correction without requiring increased overall system size, as each group performs its function efficiently within the compact structure.
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 solution achieves a compact size while maintaining favorable optical characteristics by optimizing the movement and positioning of lens groups, ensuring efficient aberration correction and reducing the size of the lens system.
Implementation Method 1
a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power
Data Source
AI summary
A zoom lens consists of, in order from an object side, a negative first lens group, a positive second lens group, a positive third lens group, a negative fourth lens group, and a positive fifth lens group. The first lens group consists of, in order from the object side, a first A lens group that does not move during focusing, a first B lens group that moves during focusing, and a first C lens group that does not move during focusing. During zooming, the first lens group and the fifth lens group do not move, and the second lens group, the third lens group, and the fourth lens group move. The fourth lens group includes a stop. The zoom lens satisfies a predetermined conditional expression.