Optical System With Final Lens Pole for Compact Aberration Correction
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Solution Overview
Problem
Existing optical systems face challenges in effectively correcting axial and off-axis aberrations, such as coma aberration, chromatic aberration, and curvature of field, while maintaining a compact size and avoiding excessive back focus.
Innovation Solution
The optical system includes a final lens group with at least one lens surface having a pole, configured to satisfy specific conditional expressions that balance aberration correction and system size, including 0.020<Y/f<0.120 and 0.010<Bf/TL<0.150, along with additional expressions to optimize lens parameters for improved aberration control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical system uses conventional lens configurations to correct aberrations, then axial and off-axis aberrations can be corrected, but the system size increases and back focus becomes excessive
Solution Approach 1:
The patent applies parameter changes by introducing a pole on a lens surface in the final lens group, which fundamentally changes the optical path parameters. This pole configuration allows for effective aberration correction while maintaining compact system dimensions, as the pole creates specific refraction patterns that correct both axial and off-axis aberrations without requiring additional lens elements that would increase system size
Solution Approach 2:
The patent applies local quality by placing a pole at a specific location on a lens surface within the final lens group. This localized feature (the pole) provides targeted aberration correction functionality without requiring global changes to the entire optical system. The pole's specific position and curvature create localized refraction effects that correct aberrations while preserving the overall compact structure
2Length of moving object
If the optical system reduces back focus to maintain compact size, then system size decreases, but aberration correction effectiveness deteriorates
Solution Approach 1:
The patent overcomes the back focus limitation by introducing a pole on the lens surface, which changes the optical parameter relationships. The pole creates specific refraction angles that allow effective aberration correction even with reduced back focus distance. This parameter change enables the system to achieve both compact size and effective aberration correction simultaneously
Solution Approach 2:
The patent utilizes curvature by introducing a pole with specific spherical or aspherical curvature on the lens surface. This curved surface geometry creates the necessary refraction patterns for aberration correction. The pole's curvature is carefully designed to provide the required optical power and aberration correction while maintaining a compact back focus distance
3Adaptability or versatility
If the optical system uses multiple lens groups for focusing, then focusing capability is improved, but the complexity of aberration correction across different focal distances increases
Solution Approach 1:
The patent applies universality by designing the final lens group with a pole that serves multiple functions simultaneously. The pole configuration provides effective aberration correction for both infinity focus and near-field focus conditions. This multi-functional design eliminates the need for separate correction mechanisms for different focal distances, thereby reducing overall system complexity while maintaining versatile focusing capability
Solution Approach 2:
The patent uses parameter changes to achieve adaptive aberration correction across different focal distances. The pole on the lens surface creates variable refraction effects that automatically adapt to different object distances. As the focusing position changes, the pole's optical effect dynamically adjusts to provide appropriate aberration correction, eliminating the need for complex mechanical adjustment mechanisms
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 effectively reduces axial and off-axis aberrations, maintains a small size, and ensures favorable imaging performance by adhering to these conditional expressions, enhancing optical performance across various focal distances.
Implementation Method 1
an optical system includes a plurality of lens groups, at focusing the distances between the lens groups are varied, a final lens group disposed closest to an image side of the lens groups includes at least one lens surface having a pole
Data Source
AI summary
An optical system used in an optical apparatus, such as a camera 1, is configured to include a plurality of lens groups such that at focusing the distances between the lens groups are varied, that a final lens group disposed closest to an image side of the lens groups includes at least one lens surface having a pole, and that all of the following conditional expressions are satisfied:0.020<Y/f<0.120 (1)0.010<Bf/TL<0.150 (2)where Y is image height, f is the focal length of the optical system, TL is the total optical length of the optical system, and Bf is the back focus of the optical system.