Five-Group Optical Layout With Moving Focus Groups for Aberration Control
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Solution Overview
Problem
Existing optical systems face challenges in achieving bright and favorable optical performance due to difficulties in correcting various aberrations such as spherical aberration, coma aberration, curvature of field, and distortion.
Innovation Solution
The optical system is configured with specific lens groups having positive and negative refractive powers, with the second and fourth lens groups moving along the optical axis during focusing, and adhering to conditional expressions that define the ratios of focal lengths and lens group lengths to optimize aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional optical system configuration is used, then the structure is simpler, but the optical performance is not bright and favorable due to uncorrected aberrations
Solution Approach 1:
The optical system is divided into five lens groups with specific refractive power assignments. The first lens group has positive refractive power, the second has negative refractive power, the third has positive refractive power, the fourth has positive refractive power, and the fifth has negative refractive power. This segmentation allows each group to be optimized for specific aberration correction functions, achieving bright and favorable optical performance while maintaining manageable structural complexity through the conditional expression constraints.
2Reliability
If more lens groups are added to correct aberrations, then optical performance improves, but the system becomes more complex and harder to manufacture
Solution Approach 1:
The patent applies conditional expressions that constrain the focal length ratios and arrangement parameters of the lens groups. Specifically, the conditional expression relating f1, f3, and other parameters ensures that the lens groups are configured within optimal ranges that facilitate manufacturing while achieving superior aberration correction. This parameter optimization makes the five-group system manufacturable without excessive complexity.
3Reliability
If the lens groups are arranged to correct multiple aberrations, then optical performance improves, but the focusing mechanism becomes more complex
Solution Approach 1:
The second and fourth lens groups are designed to move along the optical axis during focusing operations. This dynamic configuration allows the system to correct multiple aberrations across different focusing ranges while maintaining manageable mechanism complexity. The conditional expression constraints ensure that the moving groups are positioned and sized optimally, balancing aberration correction capability with focusing mechanism simplicity.
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
This configuration results in a bright optical system with improved optical performance by effectively correcting various aberrations, allowing for a smaller and more compact design.
Implementation Method 1
an optical system including a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having negative refractive power
Data Source
AI summary
An optical system (OL) includes a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having negative refractive power, disposed in order from an object along an optical axis, and upon focusing, the second lens group and the fourth lens group move along the optical axis, and the following conditional expression is satisfied:0.50<f1/f3<2.00where f1: a focal length of the first lens groupf3: a focal length of the third lens group.