Zoom Optical System Aberration Control via Multi-Group Dynamics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional zoom photographic cameras and video cameras face challenges in suppressing variation in aberration during zooming or focusing.
Innovation Solution
A zoom optical system comprising five lens groups with changing distances between adjacent groups upon zooming, and a succeeding lens group with multiple focusing lens groups that move upon focusing, to maintain image quality across different focal lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zoom optical systems are used, then image capture functionality is provided, but variation in aberration occurs during zooming or focusing
Solution Approach 1:
The optical system is divided into multiple lens groups (first through fourth lens groups) with different refractive powers, where each group contributes differently to aberration correction. The succeeding lens group is further segmented into multiple focusing lens groups that can move independently during focusing, allowing precise control over aberration characteristics across zoom and focus ranges.
Solution Approach 2:
The patent employs dynamic movement of lens groups during zooming and focusing operations. Distances between adjacent lens groups change upon zooming, and focusing lens groups move upon focusing, enabling the system to maintain optimal aberration correction across varying focal lengths and object distances through real-time optical path adjustment.
2Reliability
If multiple focusing lens groups are added to suppress aberration variation, then aberration control improves, but device complexity increases
Solution Approach 1:
The succeeding lens group serves multiple functions: it acts as both a focusing mechanism (with multiple focusing lens groups that move upon focusing) and an aberration correction mechanism (suppressing spherical aberration and other aberrations during zooming). This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The patent combines the focusing function and aberration correction function into a single succeeding lens group structure. By integrating multiple focusing lens groups within this one group that collectively handle both focusing operations and aberration suppression, the design merges what could have been separate systems into a unified structure.
3Ease of operation
If conventional lens barrel design is used, then basic optical functionality is achieved, but size and weight are larger
Solution Approach 1:
The patent optimizes optical parameters such as refractive powers of lens groups and their relative positioning to achieve compact design. By carefully selecting and adjusting these parameters, the system maintains full optical functionality while reducing the overall size and weight of the lens barrel compared to conventional designs.
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 variation in various aberrations, including spherical aberration, during zooming and focusing, while also reducing the size and weight of the lens barrel, enabling high-speed and silent autofocus.
Implementation Method 1
a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power
Data Source
AI summary
A zoom optical system (ZL) comprises, in order from an object, a first lens group (G1) having a positive refractive power, a second lens group (G2) having a negative refractive power, a third lens group (G3) having a positive refractive power, a fourth lens group (G4) having a positive refractive power and a succeeding lens group (GR). In the zoom optical system, upon zooming, distances between adjacent lens groups change, and the succeeding lens group (GR) includes a plurality of focusing lens groups that have positive refractive powers and move upon focusing.