Microscope Tube System Aberration Correction
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Solution Overview
Problem
Existing microscope tube systems face challenges with incomplete correction of infinity space, leading to issues with transverse and longitudinal chromatic aberrations, and require expensive lenses, resulting in complex structures and high costs.
Innovation Solution
A tube system for microscopes with a variable infinity space, comprising two lenses and a glass element, optimized to minimize chromatic aberrations through specific lens configurations and air gaps, allowing for aplanatic correction and reduced monochromatic aberrations, while maintaining a compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the infinity space between the objective and the tube system is not fully corrected, then the structure remains simple, but transverse chromatic aberration and monochromatic imaging aberrations increase
Solution Approach 1:
The tube system is divided into multiple lens groups (first lens group with positive refractive power, second lens group with negative refractive power, third lens group with positive refractive power) that can be independently optimized. Each group addresses specific aberrations while maintaining overall system simplicity.
Solution Approach 2:
Different regions of the tube system are optimized for different functions: the first lens group corrects transverse chromatic aberration, the second lens group addresses longitudinal chromatic aberration, and the third lens group corrects monochromatic imaging aberrations. This localized optimization allows each component to contribute specifically to aberration correction without requiring complete system redesign.
2Measurement precision
If expensive lenses are used to correct longitudinal chromatic aberration and spherical aberration, then imaging quality improves, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent specifies precise parameter ranges for the lens groups, including refractive power ratios (|f1'/f2'| between 0.5-2.0, |f2'/f3'| between 0.5-2.0), focal length ratios (f1'/f between 0.3-0.7, f3'/f between 0.3-0.7), and spacing ratios (d1/f between 0.05-0.3, d2/f between 0.05-0.3). These parameter constraints enable correction of aberrations using standard optical materials and manufacturing processes, avoiding the need for expensive specialized lenses.
3Measurement precision
If the build length of the tube system is increased to improve aberration correction, then imaging quality improves, but the system becomes less compact and more complex
Solution Approach 1:
The three lens groups are arranged in a compact nested configuration where each subsequent group is positioned close to the previous one. The spacing between groups (d1 and d2) is optimized to be a small fraction of the focal length f, allowing the entire tube system to maintain a compact build length while achieving effective aberration correction through the coordinated action of all three groups.
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 effectively corrects spherical aberrations and coma, reduces astigmatism and field curvature, and provides improved optical properties with enhanced robustness and variability, outperforming previous systems by eliminating or reducing monochromatic imaging aberrations.
Implementation Method 1
The tube system includes a first lens L1, a second lens L2, and a glass element G. The lenses and the glass element lead to a longitudinal chromatic aberration (CHL) and a transverse chromatic aberration (CHV).
Data Source
AI summary
A tube system for a microscope includes two lenses and a glass element. The tube system can have a compact build and chromatic aberrations that lie within a specified range.