Five-Lens Imaging Optical System with Moving Groups
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Solution Overview
Problem
Conventional imaging optical systems face challenges in effectively compensating for various types of aberrations across the entire focus range, leading to image quality issues due to limitations in lens group arrangements and movement during focusing.
Innovation Solution
The proposed imaging optical system consists of a specific arrangement of lens groups with positive and negative powers, including a first lens group, an aperture stop, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, where the first lens group, third lens group, and fifth lens group remain fixed while the second and fourth lens groups move along the optical axis during focusing, optimizing the compensation for aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lens groups are arranged to compensate for aberrations, then image quality is improved, but device complexity increases
Solution Approach 1:
The imaging optical system is divided into five distinct lens groups with specific powers (positive, positive, negative, positive, negative) arranged in sequence. Each lens group is segmented to perform specific aberration compensation functions, allowing complex aberration correction to be achieved through modular lens group configurations rather than a single complex lens structure.
Solution Approach 2:
Different lens groups are assigned different powers and positions to address specific aberration characteristics at different locations in the optical path. The alternating positive and negative power lens groups create localized regions of aberration compensation, with each group optimized for correcting specific types of aberrations at its particular position in the sequence.
2Adaptability or versatility
If lens groups move along optical axis during focusing, then focus range is extended, but device complexity increases
Solution Approach 1:
The imaging optical system employs dynamic movement of lens groups along the optical axis during focusing operations. Specifically, the second and fourth lens groups move along the optical axis while the first, third, and fifth lens groups remain stationary. This dynamic configuration allows the system to adapt to different focus distances by adjusting the relative positions of lens groups, extending the focus range from infinity to close objects.
3Manufacturing precision
If more lens groups are added for aberration compensation, then aberration compensation is improved, but overall size increases
Solution Approach 1:
Multiple lens groups with different powers are merged into a single compact optical sequence. The five lens groups with alternating positive and negative powers are combined in a specific arrangement where they work together to compensate for various aberrations simultaneously. This merging approach achieves comprehensive aberration compensation without requiring separate, bulky components for each correction function.
Solution Approach 2:
The system optimizes aberration compensation by carefully controlling the parameters of each lens group, including their focal lengths, positions, and powers. By adjusting these parameters within specific ranges, the system achieves effective aberration correction while maintaining a compact overall size. The alternating power configuration allows for efficient use of optical path 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
This configuration significantly improves the compensation for aberrations, ensuring high image quality across the focus range by adjusting the intervals between lens groups, thereby reducing the overall size of the imaging optical system while maintaining effective image blur compensation.
Implementation Method 1
an imaging optical system that forms an optical image of an object
Data Source
AI summary
An imaging optical system consists of a first lens group having positive power, an aperture stop, a second lens group having positive power, a third lens group having negative power, a fourth lens group having positive power, and a fifth lens group having negative power. The first lens group, the aperture stop, and the second, third, fourth, and fifth lens groups are arranged in this order such that the first lens group is located closer to an object than the aperture stop or the second, third, fourth, or fifth lens group is. While the imaging optical system is focusing to make a transition from an infinity in-focus state toward a close-object in-focus state, the first, third, and fifth lens groups are located at respectively fixed distances from an image plane in a direction aligned with an optical axis, and the second and fourth lens groups move along the optical axis.