Microscope Objective Lens Aberration Correction
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Solution Overview
Problem
Existing microscope objectives with wide fields of view, particularly ultra-low magnification objectives, face challenges in achieving uniform image quality from the center to the periphery due to uncorrected aberrations, especially off-axis aberrations like field curvature.
Innovation Solution
The objective is designed with a configuration of three lens groups: a first lens group with positive refractive power, a second lens group with negative refractive power including multiple lenses to correct field curvature and other aberrations, and a third lens group with positive refractive power to correct spherical and coma aberrations, satisfying specific conditional expressions to ensure a wide field of view and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wide field of view is achieved using ultra-low magnification objective, then the observation range is expanded, but uniform image quality from center to periphery deteriorates due to uncorrected aberrations
Solution Approach 1:
The objective lens is divided into three distinct lens groups (first with positive refractive power, second with negative refractive power, and third with positive refractive power), each containing multiple lenses with specific functions. This segmentation allows independent optimization of different optical zones to correct various aberrations across the wide field of view while maintaining expanded observation range.
Solution Approach 2:
Different regions of the optical system are assigned different functions: the first lens group corrects on-axis aberrations, the second lens group corrects off-axis aberrations including field curvature, and the third lens group further refines spherical and coma aberrations. This local quality differentiation ensures uniform image quality across the entire wide field of view.
2Manufacturing precision
If multiple lens groups are added to correct aberrations, then image quality uniformity is improved, but device complexity increases
Solution Approach 1:
Multiple lens elements are merged into three integrated lens groups, where each group combines several lenses working together to achieve multiple correction functions simultaneously. This merging reduces the overall complexity compared to having separate correction elements for each aberration type, while still achieving uniform image quality across the wide field of view.
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 aberrations across the wide field of view, ensuring uniform image quality and achieving a telephoto-type optical system with improved telecentricity and aberration correction.
Implementation Method 1
a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having the positive refractive power
Data Source
AI summary
An objective includes a positive first lens group, a negative second lens group, and a positive third lens group including two or more lens components, in which the first, second, and third lens groups are sequentially disposed from an object side. The first lens group includes a meniscus-shaped first lens having positive refractive power, in which the first lens has a concave surface facing an image side, and a meniscus-shaped second lens having positive refractive power, in which the second lens has a concave surface facing the image side. The second lens group includes two or more positive lenses and one or more negative lenses. The total number of lenses included in the second lens group is seven or more. The objective satisfies the following conditional expressions.1.6≤fL/TTL≤5(1)2≤ER1F/ER2F(2)1.29≤ER3F/ER2R(3)