Five-Group Zoom Lens Compact Design High Resolution
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Solution Overview
Problem
Current zoom lens systems face challenges in achieving a high zoom ratio of about 10 with high resolution from infinity to a close range while maintaining a compact size, as existing configurations often result in excessive lens barrel size and difficulty in correcting aberrations and image shake.
Innovation Solution
A zoom lens system comprising five lens groups with specific optical powers, where each group moves during zooming, and the fourth lens group moves on the optical axis for focusing, satisfying conditions that ensure a compact design and high-resolution imaging, including conditions for total thickness, focal lengths, and optical total length ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a five-group configuration with positive, negative, positive, negative, and positive lens groups is used to achieve high zoom ratio, then the zoom ratio can be increased to about 10, but the lens barrel size becomes excessive
Solution Approach 1:
The patent employs dynamic movement of lens groups during zooming operations. Specifically, the first lens group moves during zooming from wide angle to telephoto end, while the fourth lens group moves on the optical axis for focusing. This dynamic configuration allows the system to achieve a zoom ratio of about 10 while maintaining a compact lens barrel size by optimizing the spatial arrangement and movement paths of lens groups.
2Adaptability or versatility
If the lens groups are arranged to achieve high zoom ratio, then the zoom capability is improved, but the resolution from infinity to close range deteriorates
Solution Approach 1:
The patent applies local quality optimization by assigning specific optical powers to different lens groups. The first lens group has positive optical power for wide angle coverage, the second lens group has negative optical power for compression, the third lens group has positive optical power for telephoto enhancement, the fourth lens group has negative optical power for focusing control, and the fifth lens group has positive optical power for image quality correction. This localized optimization of optical properties enables both high zoom ratio and high resolution from infinity to close range.
3Length of moving object
If the lens barrel is made compact, then the size is reduced, but the ability to correct aberrations and image shake deteriorates
Solution Approach 1:
The patent segments the lens system into five distinct lens groups with specific optical powers, allowing independent optimization of each group's function. The first lens group handles wide angle and aberration correction, the second lens group manages compression, the third lens group provides telephoto enhancement, the fourth lens group controls focusing, and the fifth lens group corrects image shake. This segmentation enables compact lens barrel design while maintaining effective aberration and image shake correction capabilities.
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 enables a compact zoom lens system with a zoom ratio of about 10, providing high resolution from infinity to a close range, while optimizing lens barrel size and correcting image shake and aberrations effectively.
Implementation Method 1
a first lens group having positive optical power, a second lens group having negative optical power, a third lens group having positive optical power, a fourth lens group having negative optical power, and a fifth lens group having positive optical power, in order from an object side to an image side
Implementation Method 2
focusing is performed by moving the fourth lens group on an optical axis
Data Source
AI summary
A zoom lens system, in order from an object side to an image side, includes: a first lens group having positive optical power; a second lens group having negative optical power; a third lens group having positive optical power; a fourth lens group having negative optical power; and a fifth lens group having positive optical power, wherein focusing is performed by moving the fourth lens group, and conditions (1) through (3) are satisfied:Σd/(fT×tan ωT)<3.5 (1)LT/fT<1.1 (2)9.1<fT/fW (3)whereΣd is a total thickness of each of the lens groups,ωT is a half angle of view at the telephoto end,fW is a focal length at the wide angle end,fT is a focal length at the telephoto end, andLT is an optical total length at the telephoto end.