Microscope Objective Low Distortion Long Working Distance
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Solution Overview
Problem
Current microscope lenses face challenges with distortion and limited operating distance, which affect their magnification and usability, necessitating a solution for low distortion and long operating distance with high imaging performance.
Innovation Solution
A microscope objective design comprising five lenses with specific refractive powers and curvature radii, optimized through relational expressions to achieve low distortion, high magnification, and extended operating distance, with lenses made of glass to enhance optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple lenses are used to improve optical performance, then imaging quality is improved, but the length of the microscope lens increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal lengths of individual lenses (f1, f2, f3, f4, f5) and their ratios to the total focal length f, along with specifying Abbe numbers (v1, v2) and curvature radii (R1-R10), to achieve optimal optical performance within a compact total optical length TTL while maintaining high imaging quality
Solution Approach 2:
The patent uses composite optical structures combining multiple lens elements with different refractive properties (positive and negative refractive powers) to achieve superior optical characteristics that cannot be obtained with a single lens, while managing the overall length through careful design
2Measurement precision
If the microscope lens length is increased to improve optical structure, then imaging performance is improved, but the operating distance is shortened
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges including the ratio WD/TTL (0.15≤ WD/TTL≤0.35) that balances optical path length with operating distance, allowing the lens to maintain both high imaging performance and sufficient working distance for operators
3Volume of moving object
If the operating distance is shortened due to lens length, then the microscope structure is compact, but the magnification is affected
Solution Approach 1:
The patent maintains magnification quality while achieving compact structure by precisely controlling the focal length ratios (f1/f, f2/f1, f3/f, f4/f, f5/f) and the operating distance ratio (WD/TTL), ensuring that the optical system achieves high magnification within a compact total optical length TTL
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
The design achieves excellent optical performance with low distortion, 1.5 times magnification, and a long operating distance, suitable for optical microscopes, effectively addressing the limitations of existing lenses.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, and a fifth lens having a positive refractive power
Data Source
AI summary
A microscope objective, including from an exit pupil plane to an object plane: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, and a fifth lens having a positive refractive power; a focal length of the microscope objective is f, a focal length of the first lens is f1, a focal length of the second lens is f2, a focal length of the third lens is f3, an on-axis distance from the object plane of the microscope objective to an object side surface of the fifth lens is WD, a numerical aperture is NA, and a total optical length is TTL, following relational expressions are satisfied: 0.68≤f3/f≤2.00; −2.20≤f2/f1≤−1.40; 0.15≤WD/TTL≤0.35; 6.00≤f*NA≤9.00. The microscope objective has the characteristics of low distortion, 1.5 times magnification and long operating distance.