Microscope Objective Lens With Meniscus Groups for Aberration Correction
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Solution Overview
Problem
Existing high-magnification and large-numerical-aperture microscope objective lenses face challenges in effectively correcting chromatic aberrations and other optical aberrations.
Innovation Solution
The microscope objective lens is designed with a specific configuration of lens groups, including a first lens group with a specified positive meniscus lens that satisfies certain refractive index, Abbe number, and partial dispersion ratio conditions, along with a second lens group containing cemented meniscus lenses, to correct chromatic and other aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high magnification and large numerical aperture are implemented in microscope objective lenses, then resolution and imaging capability are improved, but chromatic aberrations and other optical aberrations become more difficult to correct
Solution Approach 1:
The objective lens is divided into multiple lens groups (first lens group with positive refractive power and second lens group with negative refractive power), each containing specific lens elements with defined functions. This segmentation allows independent optimization of each group to address different aberration types while maintaining high magnification and numerical aperture.
Solution Approach 2:
Specific lens elements are designed with particular properties: a positive meniscus lens with concave object-side surface and convex image-side surface is placed in the first lens group, while a cemented meniscus lens with concave image-side surface is placed in the second lens group. Each element's shape, material, and position are locally optimized to correct specific aberrations without compromising overall imaging capability.
2Reliability
If complex lens configurations are used to correct chromatic aberrations, then optical performance is improved, but device complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for key lens elements, including conditional expressions for the positive meniscus lens (relating focal length, curvature radii, and refractive index) and the cemented meniscus lens (relating focal length and curvature radii). By controlling these parameters within defined ranges, effective aberration correction is achieved without requiring excessive lens elements or complex configurations.
Solution Approach 2:
A cemented meniscus lens is employed in the second lens group, combining multiple lens materials with different refractive indices and dispersion properties. This composite approach enables effective correction of chromatic aberrations through material properties rather than relying solely on additional lens elements, thereby reducing overall system complexity.
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 lens design effectively corrects longitudinal chromatic aberration, chromatic aberration of magnification, off-axis coma aberration, and curvature of field, enhancing optical performance.
Implementation Method 1
the first lens group includes a specified positive meniscus lens that satisfies the following conditional expressions: 0.002 < (ndA - 1) / vdA < 0.005, 1.60 < ndA < 1.85, and 0.035 < θgFA < 0.065
Implementation Method 2
the second lens group includes a cemented meniscus lens having a concave surface facing an image
Implementation Method 3
a meniscus lens component having a concave surface facing the object which are disposed in order from the object along the optical axis
Data Source
AI summary
A microscope objective lens including a first lens group, and a second lens group having a negative refractive power disposed in order from an object along an optical axis. The second lens group includes a first cemented meniscus lens having a concave surface facing an image, and a second cemented meniscus lens having a concave surface facing the object which are disposed in order from the object along the optical axis, and the first lens group includes a specified positive meniscus lens that satisfies the following conditional expressions, 0<θgFA+0.0015×vdA−0.6395, 1.60<ndA<1.85, and 39.50<vdA<75.00, where ndA: a refractive index of the specified positive meniscus lens with respect to d-line, vdA: an Abbe number of the specified positive meniscus lens, and θgFA: a partial dispersion ratio of the specified positive meniscus lens.