Microscope Illumination Lens and Diaphragm Configuration
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Solution Overview
Problem
Microscopes using reflection techniques face challenges in achieving high light yield and minimizing light reflections, especially when utilizing low-intensity light sources like LEDs, which are often inefficient due to internal reflections.
Innovation Solution
A device comprising a light source with a lens combination projecting the light to infinity, a rectangular diaphragm aperture in the Fourier plane, and a circular diaphragm for sharp focus, minimizes light reflections and ensures uniform illumination by blocking unnecessary light paths and optimizing the light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If low-intensity light sources like LEDs are used in reflective-type microscopes, then energy consumption is reduced, but illumination intensity is insufficient
Solution Approach 1:
The illumination system is divided into multiple optical components (lens combination, rectangular diaphragm, additional lens, circular diaphragm) that work together to optimize light utilization. This segmentation allows each component to perform a specific function in enhancing light efficiency while using low-intensity LED sources.
Solution Approach 2:
The focal length of the lens combination is specifically adjusted to project the light source to infinity, and the diaphragms are positioned at specific planes (Fourier plane, rear focal plane) to optimize light distribution. These parameter optimizations enable low-intensity LEDs to achieve high illumination efficiency.
2Power
If conventional illumination systems are used in reflective-type microscopes, then light yield is insufficient, but internal light reflections increase
Solution Approach 1:
The rectangular diaphragm aperture is placed in the Fourier plane to extract and block unnecessary light paths that would cause internal reflections. This selectively removes harmful reflected light while preserving the useful illumination paths, thereby increasing light yield without introducing additional reflections.
Solution Approach 2:
The lens combination with adjusted focal length acts as an intermediary to project the light source to infinity, creating optimal illumination conditions. This intermediary optical element helps control light paths and minimize internal reflections while maintaining high light yield.
3Productivity
If illumination aperture is not adapted to entry pupil, then illumination efficiency is reduced, but alignment complexity increases
Solution Approach 1:
The optical system is designed so that the lens combination and diaphragm arrangement serve multiple functions: they adapt the illumination aperture to the entry pupil, control light paths, and optimize illumination uniformity. This multi-functionality achieves high illumination efficiency without requiring separate alignment mechanisms.
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 enables high-intensity, uniform illumination with minimal light reflections, effectively utilizing low-intensity light sources such as LEDs, enhancing the performance of reflective-type microscopes by reducing internal reflections and increasing light yield.
Implementation Method 1
a lens combination with a short focal length, the focal length of the lens combination being adjusted in such a way that the light source is projected to infinity
Implementation Method 2
a rectangular diaphragm aperture, which is located on the rear focal plane of the lens combination, the Fourier plane of the lens combination being situated on the plane
Implementation Method 3
an additional lens with a focal length, through which the rectangular diaphragm aperture is projected onto the intermediate image plane of the microscope
Implementation Method 4
a circular diaphragm, onto which the light source is projected in sharp focus and which is located on the rear focal plane of the additional lens
Data Source
AI summary
A device for high-intensity uniform illumination with minimal light reflection for use in reflective-type microscopes has a light source with a uniform emission and the following components, arranged in succession in the emission direction: a lens combination with a short focal length, the focal length of the lens combination being adjusted in such a way that the light source is projected to infinity; a rectangular diaphragm aperture, which is located on the rear focal plane of the lens combination, the Fourier plane of the lens combination being situated on the plane; an additional lens with a focal length, through which the rectangular diaphragm aperture is projected onto the intermediate image plane of the microscope; and a circular diaphragm, onto which the light source is projected in sharp focus and which is located on the rear focal plane of the additional lens.