Microscope Objective Lens Aberration Correction
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Solution Overview
Problem
Conventional microscope objective lenses face challenges in maintaining high resolution and correcting spherical aberrations caused by variations in cover glass thickness, leading to deteriorated observation performance.
Innovation Solution
A microscope objective lens design featuring a first lens group with positive power, a second lens group that moves along the optical axis to correct aberrations, and a configuration satisfying specific conditional expressions for numerical aperture and focal length ratios, allowing for effective correction of spherical aberrations and maintaining high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high numerical aperture is used to achieve high resolution observation, then the resolution is improved, but spherical aberrations increase due to variations in cover glass thickness
Solution Approach 1:
The patent implements a movable second lens group that can shift along the optical axis to dynamically adjust and correct spherical aberrations caused by cover glass thickness variations. This dynamic adjustment mechanism allows the lens system to maintain high resolution while compensating for manufacturing tolerances and variations in cover glass thickness.
Solution Approach 2:
The patent changes the position parameter of the second lens group along the optical axis to correct spherical aberrations. By adjusting the axial position of this lens group, the system optimizes the optical path and compensates for aberrations introduced by varying cover glass thickness, thereby maintaining image quality across different specifications.
2Adaptability or versatility
If a correction collar is added to correct spherical aberrations, then the adaptability to different cover glass thicknesses is improved, but the device complexity increases
Solution Approach 1:
The movable second lens group serves multiple functions: it contributes to the overall focusing capability of the objective lens while simultaneously acting as the correction mechanism for spherical aberrations. This multi-functionality eliminates the need for a separate correction collar, reducing device complexity while maintaining adaptability to different cover glass thicknesses.
Solution Approach 2:
The patent merges the correction function into the existing second lens group of the objective lens system. By combining the correction mechanism with a regular lens group, the design avoids adding separate correction components, thereby reducing structural complexity while achieving effective correction of spherical aberrations across various cover glass specifications.
3Reliability
If the second lens group is made movable to correct aberrations, then the correction capability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The movable second lens group is designed to automatically adjust its position based on the cover glass thickness, eliminating the need for complex external adjustment mechanisms. The lens group's movement is driven by the optical requirements themselves, allowing the system to self-correct spherical aberrations while maintaining reasonable manufacturing tolerances for the positioning mechanism.
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 design achieves high numerical aperture and low magnification while effectively correcting spherical aberrations, ensuring high-resolution observation and maintaining field flatness despite variations in cover glass thickness.
Implementation Method 1
the second lens group is configured to move in an optical axis direction between the first lens group and the third lens group so as to correct a variation in an aberration caused by a thickness of a cover glass
Data Source
AI summary
A microscope objective lens includes, in an order starting from an object side, a first lens group having a positive power, a second lens group having a positive power, a third lens group having a negative power, and a fourth lens group having a positive power. The second lens group is configured to move in an optical axis direction between the first lens group and the third lens group so as to correct a variation in an aberration caused by a thickness of a cover glass. The following conditions are satisfied:0.65<NA<1; and1<f1/F<2, whereNA is a numerical aperture of the microscope objective lens, F is a focal length of the microscope objective lens, and f1 is a focal length of the first lens group.