Microscope Objective Lens Layout for High-NA Aberration Correction
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Solution Overview
Problem
Existing microscope objective lenses with high magnification and large numerical aperture face challenges in effectively correcting various aberrations such as chromatic aberration of magnification, spherical aberration, coma aberration, and curvature of field.
Innovation Solution
A microscope objective lens configuration comprising specific lens groups with defined conditional expressions, including a first plano-convex positive lens and negative lens, a second lens group with positive lenses, a third lens group with concave surfaces, and a fourth lens group with concave surfaces, optimized by conditional expressions to correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high magnification and large numerical aperture are implemented, then imaging resolution is improved, but aberration correction becomes difficult
Solution Approach 1:
The objective lens is divided into multiple lens groups (first through fourth lens groups) with specific arrangements. Each lens group contains specific lens elements (positive and negative lenses) that work together to correct different types of aberrations while maintaining high magnification and numerical aperture capabilities
Solution Approach 2:
Different lens elements within each lens group have specifically designed local optical properties (refractive indices, curvatures, thicknesses) to address specific aberration types. For example, the first lens group includes a plano-convex positive lens and a negative lens with specific properties to correct chromatic aberration of magnification locally
2Manufacturing precision
If multiple lens groups are added to correct aberrations, then aberration correction is improved, but device complexity increases
Solution Approach 1:
Multiple lens groups are merged into a compact arrangement where the first, second, third, and fourth lens groups are positioned close to each other along the optical axis. This merging approach corrects multiple aberration types (chromatic aberration of magnification, spherical aberration, coma aberration, curvature of field) within a unified structure rather than using separate correction systems
Solution Approach 2:
Each lens group serves multiple functions: the first lens group corrects chromatic aberration of magnification, the second lens group addresses spherical and coma aberrations, the third and fourth lens groups work together to correct curvature of field and other aberrations. This multi-functionality reduces the need for additional dedicated correction elements
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 configuration achieves excellent correction of chromatic aberration, spherical aberration, coma aberration, and curvature of field, maintaining high magnification and large numerical aperture.
Implementation Method 1
a first lens group G1 having positive refractive power, a second lens group G2 having positive refractive power, a third lens group G3 having negative refractive power, and a fourth lens group G4 having negative refractive power, the lens groups being arranged in order from the object side along the optical axis
Data Source
AI summary
An objective lens (OL) is constituted by a first lens group (G1), a second lens group (G2) having a positive refractive power, a third lens group (G3) having a concave surface facing the image side, and a fourth lens group (G4) having a concave surface facing the object side. The first lens group satisfies conditional expressions 1.8<H1/H2<3.5 and 1.3<DLe/H2<3.5, where: H1 is the distance between the optical axis and the light ray most separated from the optical axis in the second lens group (G2), from among light rays emitted from an object (OB) on the optical axis; H2 is the distance between the optical axis and the light ray most separated from the optical axis at a lens surface on the image side of a final lens (Le); and DLe is the length of the final lens (Le) on the optical axis.