Variable Magnification Optical System Aberration Control
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Solution Overview
Problem
Existing variable magnification optical systems for cameras face challenges in achieving optimal optical performance and downsizing while effectively correcting aberrations and curvature of field across different focal lengths.
Innovation Solution
A variable magnification optical system comprising multiple lens groups with a final lens group closest to the image side having a pole, where the distances between lens groups are varied to satisfy specific conditional equations, ensuring optimal focal length ratios and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional variable magnification optical systems are used, then optical performance can be maintained, but the system size and complexity increase
Solution Approach 1:
The patent applies parameter changes by optimizing the conditional equations for focal length ratios (0.30 < f2/f1 < 1.20 and 0.50 < f3/f1 < 2.00) and controlling total optical length relative to wide-angle focal length (0.80 < TL/fw < 3.00). These parameter optimizations enable the system to achieve compact size while maintaining optical performance across variable magnification ranges.
2Reliability
If multiple lens groups are used to correct aberrations, then optical performance improves, but device complexity increases
Solution Approach 1:
The patent optimizes aberration correction by controlling the focal length ratios between lens groups through conditional equations (0.30 < f2/f1 < 1.20 and 0.50 < f3/f1 < 2.00). This parameter-based approach achieves effective aberration correction with a streamlined lens configuration, avoiding excessive complexity while maintaining optical quality.
3Reliability
If focal length ratios are optimized, then aberration correction improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines practical parameter ranges (0.30 < f2/f1 < 1.20 and 0.50 < f3/f1 < 2.00) that balance aberration correction performance with manufacturing feasibility. These ranges are wide enough to accommodate normal manufacturing tolerances while still achieving effective aberration control, avoiding overly stringent precision requirements.
Solution Approach 2:
The patent applies partial action by optimizing only the critical focal length ratios and total optical length parameters rather than controlling every lens element individually. This selective parameter optimization achieves sufficient aberration correction without imposing excessive precision requirements on all manufacturing aspects.
4Volume of moving object
If total optical length is reduced for downsizing, then compactness improves, but optical performance deteriorates
Solution Approach 1:
The patent optimizes the ratio of total optical length to wide-angle focal length within the range 0.80 < TL/fw < 3.00. This parameter control enables the system to achieve compact dimensions while maintaining sufficient optical performance by ensuring the total length remains appropriately scaled to the focal length requirements.
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 favorable optical performance, downsizing, and effective aberration correction across wide-angle and telephoto end states, reducing variations in curvature of field and coma aberrations.
Implementation Method 1
a final lens group closest to an image side of the lens groups includes at least one lens surface having a pole
Data Source
AI summary
A variable magnification optical system used in an optical apparatus is configured to include a plurality of lens groups such that upon varying magnification the distances between the lens groups are varied; a final lens group closest to an image side of the lens groups includes at least one lens surface having a pole; and the following conditional equation (1) or (2) is satisfied.0.50<TL/fw<10.00 (1)where TL denotes the shorter of the total optical length in a wide-angle end state and the total optical length in a telephoto end state of the variable magnification optical system, and fw denotes the focal length of the variable magnification optical system in the wide-angle end state.−5.00<fRI/fR<5.00 (2)where fRI denotes the focal length of a lens in the final lens group including a lens surface having a pole, and fR denotes the focal length of the final lens group.