Variable Power Optical Assembly Aberration Management
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Solution Overview
Problem
Conventional variable magnification optical systems face challenges in achieving high optical performance while being compact in size, as they struggle to maintain a high variable magnification ratio and sufficient optical performance during downsizing.
Innovation Solution
A variable magnification optical system comprising multiple lens groups with specific refractive powers and focal length relationships, where the distances between these groups are varied to achieve a high magnification ratio and suppress aberrations, is designed. This system includes a first lens group with positive refractive power, a second lens group with negative refractive power, and additional groups with varying focal lengths and distances adjusted to satisfy specific conditional expressions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the variable magnification optical system is downsized to reduce apparatus size, then compactness is improved, but optical performance deteriorates
Solution Approach 1:
The optical system is divided into six distinct lens groups with specific refractive power assignments. Each group is optimized independently and positioned at calculated distances from others, allowing the system to achieve high variable magnification ratio while maintaining compact overall size and preserving optical performance through specialized functional segmentation.
Solution Approach 2:
The patent applies specific conditional expressions that define precise relationships between focal lengths of different lens groups (f1/fw, f2/ft ratios) and distances between groups. By optimizing these parameters within specified ranges, the system achieves compact dimensions while maintaining high optical performance across the variable magnification ratio.
2Adaptability or versatility
If the variable magnification ratio is increased to achieve higher telephoto capability, then zoom range is improved, but apparatus size increases
Solution Approach 1:
The system employs dynamic positioning of lens groups along the optical axis during zooming operations. The distances between lens groups are varied in a coordinated manner, with specific groups moving at different rates and directions, enabling high variable magnification ratio while keeping the overall apparatus size compact through efficient spatial utilization.
Solution Approach 2:
The lens groups are arranged in a nested configuration where smaller lens groups are positioned within the spatial envelope of larger groups. This nested arrangement allows the system to achieve high variable magnification ratio without proportionally increasing the overall apparatus size, as the lens groups share overlapping spatial volumes during different zoom states.
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 system achieves a high variable magnification ratio, compact size, and excellent optical performance by effectively managing spherical aberration, astigmatism, and distortion through the strategic arrangement and movement of lens groups during zooming from wide-angle to telephoto states.
Implementation Method 1
a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power
Data Source
AI summary
Comprising, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; a fourth lens group G4; a fifth lens group G5; and a sixth lens group G6; upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2, a distance between the second lens group G2 and the third lens group G3, a distance between the third lens group G3 and the fourth lens group G4, a distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and a sixth lens group G6 being varied; and a predetermined conditional expression being satisfied, thereby providing a variable magnification optical system which has a high variable magnification ratio, is compact in size and has high optical performance, an optical apparatus, and a method for manufacturing the variable magnification optical system.