Microtome Knife Edge Alignment Using Uniform Gap Illumination
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Solution Overview
Problem
Existing microtome systems face challenges in automating the alignment of the knife edge with the specimen block, particularly due to varying illumination intensities from the fine and coarse facets of the knife, which can lead to difficulties in determining geometric features and increase the risk of damage during manual alignment.
Innovation Solution
The microtome system employs an illumination source to ensure that the fine and coarse facets of the knife are illuminated with similar intensities, allowing for automatic alignment by detecting geometric features through a detector, and includes features like a knife holder with reflective surfaces or mirrors to enhance illumination uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual alignment is performed by bringing the knife and specimen block close together to utilize light diffraction, then alignment precision is improved, but the risk of damaging the specimen block or knife increases
Solution Approach 1:
The patent introduces an optical intermediary system (illumination source and detector) that enables alignment assessment at a safer distance. The illumination source projects light through the gap between knife edge and specimen block, and the detector captures the light pattern, allowing alignment verification without requiring the knife and specimen to be in direct contact or extremely close proximity, thus preventing damage while maintaining precision
Solution Approach 2:
The patent replaces the mechanical/visual inspection method with an optical detection system. Instead of relying on visual observation through microscopes or direct mechanical contact for alignment, the system uses light transmission and detection to assess alignment, substituting the mechanical alignment verification process with an optical field-based measurement that eliminates the need for close physical proximity
2Productivity
If automated alignment is implemented without uniform illumination, then productivity is improved, but measurement precision deteriorates due to varying illumination intensities from fine and coarse facets
Solution Approach 1:
The patent applies local quality by providing differentiated illumination targeting specific regions. The illumination source is positioned and configured to specifically illuminate the gap region between the knife edge and specimen block, ensuring that the light passes through this critical measurement zone. This localized illumination approach ensures uniform lighting across the measurement field while allowing the automated detector to accurately capture geometric features without interference from uneven lighting conditions
Solution Approach 2:
The patent changes the illumination parameters (intensity distribution, angle, position) to achieve uniform illumination across the measurement gap. By adjusting these optical parameters, the system ensures that both the fine and coarse facets of the knife are illuminated consistently, enabling the detector to accurately measure geometric features and facilitating reliable automated alignment without the measurement precision deterioration that would result from varying illumination intensities
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 approach enables precise and automated alignment of the knife edge with the specimen block, reducing the risk of damage and simplifying the alignment process for both experienced and inexperienced users.
Implementation Method 1
the light reflected by them (i.e., the fine facet and the at least part of the coarse facet) is reflected, to the detector, by the front face of the specimen block
Implementation Method 2
the light reflected by them (i.e., the fine facet and the at least part of the coarse facet) is reflected, to the detector, by the front face of the specimen block
Data Source
Figure 1a
Figure 1b
Figure 2a~2b
AI summary
The invention generally relates to a microtome system (100) for cutting sections from a specimen block, wherein the microtome system (100) comprises: a specimen holder, a knife (110) having a knife edge (112), wherein the knife (110) comprises a fine facet (114.1) and a coarse facet (116.1), wherein the knife edge (112) is formed, at least in part, by the fine facet (114.1), a knife holder (120), an illumination source (130), and a detector (140); wherein the illumination source (130) is configured to illuminate a gap (136) between a front face (128) of the specimen block (126) and the knife edge (112), such that the fine facet (1141) and at least a part of the coarse facet (1161) are illuminated and the light reflected by them is reflected to the detector (140), by the front face (128) of the specimen block (126), such that a illuminated area is produced, wherein at least a part of the knife edge (112) and at least a part of an image of the knife edge mirrored by the front face (128, 428) of the specimen block (126) form boundaries of the illuminated area, and wherein the light reflected by the fine facet (1141) and by at least the part of the coarse facet (116.1) have, at least in average, essentially the same illumination intensity, and wherein the microtome system (100) is configured to image, by means of the detector (140), the illuminated area, and to determine, based on the imaged illuminated area, a geometric feature of the illuminated area.