Microscope Objective Lens Aberration Correction

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Solution Overview

Problem

High-magnification microscope objective lenses with high numerical aperture face challenges in effectively correcting various aberrations, particularly chromatic aberration of magnification, which affects imaging quality.

Innovation Solution

The design of a microscope objective lens comprising a first lens group with positive refractive power, a second lens group with a concave surface facing the image, and a third lens group with a concave surface facing the object, where specific conditional expressions for the Abbe numbers and partial dispersion ratios of the lenses are satisfied to correct chromatic and other aberrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If high magnification and high numerical aperture are achieved, then imaging resolution is improved, but chromatic aberration of magnification worsens

Engineering Contradiction:

Improveimaging resolutionVSAvoidchromatic aberration of magnification

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The objective lens is divided into multiple lens groups (first lens group with positive refractive power, second lens group with concave surface facing image, third lens group with concave surface facing object). Each group contains specific numbers of lenses with defined refractive powers and Abbe numbers, allowing independent optimization of chromatic aberration correction while maintaining high magnification and numerical aperture for improved imaging resolution.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If high magnification and high numerical aperture are achieved, then imaging resolution is improved, but secondary spectrum worsens

Engineering Contradiction:

Improveimaging resolutionVSAvoidsecondary spectrum

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

Specific lenses within the lens groups are assigned particular Abbe numbers and partial dispersion ratios to target secondary spectrum correction. The third lens group includes negative lenses with specific Abbe numbers (νdA < 40) and the second lens group includes positive lenses with specific partial dispersion ratios (θ2P), creating localized optical properties that correct secondary spectrum while preserving the high-resolution capabilities of the overall system.

Inventive Principle:

Principle #3Local quality

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

This configuration effectively corrects chromatic aberration of magnification and secondary spectrum, improving the overall imaging performance and optical system efficiency.

Implementation Method 1

a first lens group having a positive refractive power; a second lens group having a concave surface facing an image; and a third lens group having a concave surface facing the object

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20240019676A1Microscope objective lens, microscope optical system, and microscope device

Publication Date: 2024.01.18 NIKON CORP

AI summary

A microscope objective lens (OL) comprises a first lens group (G1) having positive refractive power, a second lens group (G2) having a concave surface facing the image side, and a third lens group (G3) having a concave surface facing the object side, which are arranged in order from the object side along an optical axis. The first lens group (G1) comprises one lens component having positive refractive power, the third lens group (G3) comprises three or more lenses including two negative lenses and one positive lens, and at least one predetermined negative lens in the two negative lenses satisfies the conditional expression “νdA<40”.