Microscope Eyepiece Optical System Reducing Prism Size
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Solution Overview
Problem
Conventional superwide-field-of-view microscope eyepieces are large, heavy, and expensive due to the large diameter of the prism inside the binocular barrel, which is required to achieve a field number of 26.5, making them impractical for widespread use.
Innovation Solution
The microscope optical system reduces the focal length of the eyepiece and imaging optical systems by the same percentage while increasing the magnification of the eyepiece, maintaining the same total magnification and field number, thereby reducing the size of the prism and binocular barrel, through specific conditional expressions and the use of an intermediate lens system with a magnification conversion function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a 30-mm square prism is used to achieve a field number of 26.5, then the field of view is widened, but the binocular barrel becomes large, heavy, and expensive
Solution Approach 1:
The patent changes the optical parameters by introducing an intermediate imaging optical system with specific focal length relationships. By setting the focal length of the intermediate imaging optical system to be shorter than that of the eyepiece optical system, and satisfying specific conditional expressions (Fntl/Fob × 250/Fne = M, Fntl = Ftl × Kt, Fne = Fe × Kt, where 0.4 ≤ Kt < 0.95), the system achieves a field number of 26.5 with a reduced prism size, thereby reducing the weight and complexity of the binocular barrel while maintaining the desired field of view
2Area of moving object
If a 30-mm square prism is used to achieve a field number of 26.5, then the field of view is widened, but the number of required lenses increases
Solution Approach 1:
The patent introduces an intermediate imaging optical system as a mediator between the objective optical system and the eyepiece optical system. This intermediate system, with its specific focal length characteristics (Fntl < Fne and satisfying the conditional expressions), serves as a bridge that enables the eyepiece to achieve a field number of 26.5 without requiring a proportionally large prism or excessive number of lenses, thus reducing overall system complexity
3Length of stationary object
If the focal length of the eyepiece optical system is reduced, then the eyepiece size is reduced, but the magnification of the eyepiece increases
Solution Approach 1:
The patent deliberately changes the focal length parameter of the eyepiece optical system to be shorter than that of the intermediate imaging optical system. By satisfying the conditional expression Fne = Fe × Kt where 0.4 ≤ Kt < 0.95, the system achieves a reduced eyepiece length while the eyepiece magnification increases accordingly. This parameter change is balanced by the intermediate imaging system to maintain the desired total magnification and field number
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 allows for super-wide view observation with a short, lightweight, and inexpensive eyepiece optical system and binocular barrel, effectively reducing the size of the prism and barrel while maintaining the same viewing angle and field number.
Implementation Method 1
an objective optical system configured to collect light from a specimen
Implementation Method 2
an imaging optical system configured to image the light coming from the specimen and collected by the objective optical system
Implementation Method 3
an eyepiece optical system configured to magnifies the image of the specimen formed by the imaging optical system and form a virtual image in an eye of an observer
Data Source
AI summary
Observation over a superwide field of view is possible with a short, lightweight, and inexpensive eyepiece optical system and a binocular barrel. A microscope optical system includes an objective optical system configured to collect light from a specimen; an imaging optical system configured to image the light coming from the specimen and collected by the objective optical system; and an eyepiece optical system configured to magnify the image of the specimen formed by the imaging optical system and form a virtual image in an eye of an observer, wherein the following conditional expressions are satisfied, M=Fntl/Fob×250/Fne (1) Fntl=Ftl×Kt (2) Fne=Fe×Kt (3) 0.4<kt<0.95 (4).