Microscope Objective Displaceable Lens Group Coma Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microscope objectives with adjustable lens arrangements for correcting spherical aberration often impair imaging quality due to coma and other optical distortions, particularly when lenses are displaced along the optical axis.
Innovation Solution
A displaceable lens group is designed to minimize imaging quality degradation by satisfying specific conditions for beam ray imaging, including a longitudinal aberration greater than or equal to 0.3 times the focal length of the lens group, and incorporating triple cemented members with lenses made of different materials to compensate for spherical aberration and reduce coma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lens group is made displaceable along the optical axis to correct spherical aberration, then spherical aberration correction capability is improved, but imaging quality deteriorates due to coma and other optical distortions
Solution Approach 1:
The patent applies parameter changes by specifically designing the longitudinal aberration parameter (Δs′) to be greater than or equal to 0.3 times the focal length (f′) of the displaceable lens group. This parameter constraint ensures that when the lens group moves along the optical axis for spherical aberration correction, the resulting coma is minimized, thus maintaining imaging quality while preserving correction capability
Solution Approach 2:
The patent applies local quality by making only a specific lens group displaceable rather than the entire objective, and by positioning this correction group at a specific location where it can correct spherical aberration while minimizing the generation of coma. The displaceable lens group is strategically designed to have specific optical properties that allow it to correct aberrations without significantly degrading overall imaging quality
2Reliability
If lenses are displaced along the optical axis for spherical aberration correction, then correction effectiveness is improved, but coma increases degrading image quality
Solution Approach 1:
The patent uses parameter changes by establishing a specific relationship between the longitudinal aberration (Δs′) and the focal length (f′) of the displaceable lens group. By requiring Δs′≥0.3f′, the design ensures that the lens group generates sufficient longitudinal aberration to effectively correct spherical aberration while simultaneously limiting the generation of coma, thus balancing correction effectiveness with harm reduction
Solution Approach 2:
The patent applies blessing in disguise by utilizing the longitudinal aberration, which is typically considered a harmful optical defect, as a beneficial parameter. By deliberately designing the displaceable lens group to have Δs′≥0.3f′, the patent converts what would normally be an unwanted aberration into a feature that enables effective spherical aberration correction while minimizing coma generation
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 maintains high imaging quality by compensating for spherical aberration and minimizing coma, ensuring stable and high-resolution imaging even with optical axis displacement, with a numerical aperture of at least 0.8 for high-resolution microscopy.
Implementation Method 1
a displaceable correction group 2 having a focal length f′ for compensating a spherical aberration
Implementation Method 2
at least one beam ray imaging a point on the optical axis from the first paraxial intermediate image into the second paraxial intermediate image
Data Source
AI summary
An objective for a microscope includes a displaceable lens group for correcting a spherical aberration. The displaceable lens group is designed in so that an offset of same in the direction perpendicular to the optical axis leads to only a small coma.