Optical System Aberration Control via Perpendicular Lens Movement
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Solution Overview
Problem
Conventional optical systems face challenges in suppressing ghost images and flare, and controlling aberrations, especially during vibration reduction, due to large variations in aberrations and reflection issues from optical surfaces.
Innovation Solution
An optical system comprising a first lens group with positive refractive power, a movable second lens group with negative refractive power, and a third lens group with positive refractive power, where at least the third lens group is movable perpendicular to the optical axis, satisfying specific focal length ratios to optimize aberration correction and reduce ghost images and flare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multi-layered coating technology is applied to suppress ghost images and flare, then optical performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The optical system divides the lens structure into multiple lens groups with different refractive powers (positive, negative, positive), where each group addresses specific optical issues. The third lens group is further segmented into movable and fixed portions to independently handle vibration reduction and focusing functions, reducing the complexity of applying multi-layered coatings across the entire system.
Solution Approach 2:
The patent applies antireflection coatings selectively to specific lens surfaces rather than uniformly across all surfaces. By identifying and treating only the surfaces most prone to generating ghost images and flare, the system achieves effective suppression while reducing overall coating complexity and manufacturing cost.
2Ease of manufacture
If conventional optical system design is used, then manufacturing is simpler, but aberration variations during vibration reduction become large
Solution Approach 1:
The optical system incorporates movable lens groups that can dynamically adjust their positions during operation. The third lens group's movable portion specifically addresses vibration-induced aberrations by shifting to compensate for camera shake, maintaining optical precision without requiring overly complex manufacturing tolerances.
Solution Approach 2:
The patent optimizes specific parameter ranges for lens group focal lengths (f1/f, f2/f, f3/f ratios) to balance manufacturing feasibility with aberration control. By defining appropriate parameter ranges rather than fixed values, the system accommodates manufacturing variations while maintaining acceptable optical performance during vibration reduction.
3Reliability
If lens groups are made movable for vibration reduction, then optical performance is improved, but device complexity increases
Solution Approach 1:
The lens system is segmented into distinct functional groups: the second lens group handles focusing movements while the movable portion of the third lens group handles vibration reduction. This segmentation allows each subsystem to be optimized independently, reducing overall system complexity while maintaining reliable optical performance.
Solution Approach 2:
The movable portion of the third lens group serves multiple functions: it corrects vibration-induced aberrations and can work in conjunction with the second lens group for focusing. This multi-functionality reduces the need for separate dedicated mechanisms, thereby reducing device complexity while improving optical performance stability.
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 effectively suppresses ghost images and flare while controlling variations in aberrations during vibration reduction, achieving superior optical performance by optimizing the focal length ratios of the lens groups and applying antireflection coatings to key surfaces.
Implementation Method 1
an optical system includes, in order from an object side, 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
reflection light producing ghost images and flare are liable to be generated from optical surfaces in such an optical system
Data Source
AI summary
An optical system includes, in order from an object side, 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. The second lens group is moved upon carrying out focusing from an infinitely distant object to a close object, at least a portion of the third lens group is moved in a direction including a component perpendicular to an optical axis, and given conditional expressions is satisfied. Accordingly, an optical system excellently suppressing variations in aberrations generated upon vibration reduction, an optical apparatus equipped therewith, and a method for manufacturing the optical system are provided.