Removable Optical Member for Macro Imaging Aberration Control
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Solution Overview
Problem
Existing optical systems face challenges in achieving high imaging magnification while maintaining high optical performance, as increased magnification often leads to degradation in optical performance due to increased refractive power and the number of lens elements, resulting in larger size and aberrations.
Innovation Solution
An optical system with a removably insertable optical member that is positioned in the optical path in specific focus ranges, utilizing an aperture stop and a drive mechanism to adjust the optical member's position, ensuring the optical member's thickness and focal length ratio meet specific conditions to correct aberrations and maintain high imaging magnification and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements in the rear conversion lens is increased to achieve high imaging magnification, then the imaging magnification is improved, but the thickness of the rear conversion lens increases, leading to increased overall system size
Solution Approach 1:
The patent introduces a movable optical member that can be dynamically positioned in the optical path during macro photography mode. This optical member has positive refractive power and is inserted only when needed for high magnification, allowing the system to achieve high imaging magnification without permanently increasing the number of lens elements or overall system size. The optical member moves between inserted and removed states based on focusing distance requirements.
2Measurement precision
If the refractive power of the rear conversion lens is increased to achieve high imaging magnification, then the imaging magnification is improved, but aberration such as curvature of field increases, degrading optical performance
Solution Approach 1:
The patent applies local quality by designing the optical member with specific refractive power characteristics that are optimized for correcting aberrations in the macro photography focus range. The optical member has positive refractive power that is carefully controlled to balance between providing necessary magnification and correcting curvature of field and other aberrations. By localizing the correction function to this specific optical member rather than increasing the entire lens system's complexity, the patent achieves high optical performance in the macro range without degrading overall system performance.
3Measurement precision
If a rear conversion lens is added to increase imaging magnification, then the imaging magnification is improved, but the overall size of the optical system increases
Solution Approach 1:
The patent uses a movable optical member that can be inserted and removed from the optical path based on the focusing distance. During macro photography (second focus range), the optical member is inserted to provide high imaging magnification. During other focusing ranges (first focus range from infinity to first finite distance), the optical member is removed, maintaining a compact optical system length. This dynamic insertion/removal mechanism allows the system to achieve high magnification only when needed, without permanently increasing the optical system's overall size.
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 allows for increased imaging magnification while reducing the size of the optical system and correcting aberrations, such as curvature of field, thereby achieving high optical performance and compactness.
Implementation Method 1
an optical member that is removably insertable in an optical path defined by an object side and an image side of the optical system
Data Source
AI summary
An optical system includes an aperture stop, and an optical member that is removably insertable in an optical path defined by an object side and an image side of the optical system, the optical member is disposed on the image side of the aperture stop. In a first focus range between infinity and a first finite distance, the optical member is removed from the optical path. In a second focus range between a second finite distance shorter than the first finite distance and a third finite distance shorter than the second finite distance, the optical member is inserted in the optical path. The thickness of the optical member on the optical axis and the focal length of the optical member are suitably determined.