Microscope Correction Objective with Movable Lens Group
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Solution Overview
Problem
Current microscope corrective objectives either require adjusting the paraxial focus when correcting spherical aberrations or have mechanically complex structures with high production costs and susceptibility to repairs.
Innovation Solution
A corrective objective with a first, second, third, and fourth lens group, where the second lens group with positive refractive power is movable along the optical axis, maintaining a constant distance to the first and third lens groups, and having a magnification between −0.9 and −1.1, allowing for focal adjustment without changing the paraxial focus position and reducing mechanical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the second lens group is moved along the optical axis to correct spherical aberration, then spherical aberration is corrected, but the position of the paraxial focus changes
Solution Approach 1:
The patent employs a dynamic compensation mechanism where a third lens group with negative refractive power is moved in coordination with the second lens group. When the second lens group moves to correct spherical aberration, the third lens group simultaneously moves to counteract the resulting paraxial focus shift, maintaining focus stability while achieving aberration correction.
2Ease of operation
If a single corrective element with low refractive power is used, then the paraxial focus remains stable, but the lens length and diameter increase
Solution Approach 1:
The patent changes the refractive power parameter of the corrective element (second lens group) to have high refractive power, approximately equal to or greater than the total refractive power of the corrective objective. This allows compact lens dimensions while achieving effective spherical aberration correction through coordinated movement with the negative power third lens group.
3Measurement precision
If multiple lens groups are moved to correct spherical aberration, then correction effectiveness is improved, but mechanical complexity and production costs increase
Solution Approach 1:
The patent segments the corrective objective into four distinct lens groups with specific refractive power characteristics. The second lens group (positive power) and third lens group (negative power) work together as a coordinated correction mechanism, where only these two groups move along the optical axis to correct spherical aberration, while the first and fourth lens groups remain stationary.
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
Enables correction of spherical aberrations without altering the paraxial focus position and achieves a compact, cost-effective design with reduced mechanical complexity, suitable for microscopy applications.
Implementation Method 1
The second lens group constitutes a corrective element which can be moved along an optical axis to correct the spherical aberration caused by, for example, variations in cover slip thickness
Implementation Method 2
a first lens group with positive refractive power, a second lens group with positive refractive power, a third lens group with negative refractive power and a fourth lens group with positive refractive power
Data Source
AI summary
The invention relates to a correction objective (10), comprising a first lens group (12) of positive optical power, a second lens group (14) of positive optical power, a third lens group (16) of negative optical power, and a fourth lens group (18) of positive optical power, which are arranged in this order from the object side, the second lens group (14) being movable along the optical axis (O) in such a way that the sum of the distance (V1) between the second lens group (14) and the first lens group (12) and the distance (V2) between the second lens group (14) and the third lens group (16) is constant. The image scale of the second lens group (14) lies in a range of −0.9 to −1.1.