Twelve-Lens Microscope Objective for Low Aberration and Long Working Distance
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Solution Overview
Problem
Conventional microscope lenses suffer from distortions, elongated structures affecting working distance, and magnification issues due to optical structural constraints, which hinder improved observation quality and user convenience.
Innovation Solution
A microscope objective lens design comprising twelve lenses with specific refractive forces and focal lengths, controlled radii of curvature, and thicknesses, adhering to defined relationships to minimize aberrations and enhance optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple lenses are used to improve optical performance, then aberration correction is improved, but the lens length increases and working distance decreases
Solution Approach 1:
The objective lens is divided into multiple lens groups (first through fourth lens groups) with specific positive and negative refractive forces. Each group contains one or more lenses with carefully selected focal lengths and spacing, allowing distributed correction of various aberrations while managing overall length through strategic grouping and positioning.
Solution Approach 2:
The patent specifies precise parameter ranges including focal length ratios (e.g., 0.08≤f1/f≤0.27), radius of curvature ratios (e.g., -1.83≤(R1+R2)/(R1−R2)≤−0.56), and thickness ratios (e.g., 0.01≤d1/TTL≤0.03). These parameter optimizations enable effective aberration correction while controlling the overall lens length and maintaining adequate working distance.
2Reliability
If lens thickness and spacing are increased to reduce aberrations, then optical quality is improved, but the overall lens length increases
Solution Approach 1:
The patent establishes specific parameter ranges for lens thicknesses (d1, d3, d5, d7, d9, d11) as ratios of total lens length TTL, and for spacing between lenses (d2, d4, d6, d8, d10, d12) as ratios of focal length f. These optimized parameter ranges achieve effective aberration correction while controlling overall lens length through mathematical relationships that balance optical performance with compact dimensions.
3Ease of operation
If working distance is increased for user convenience, then ease of operation is improved, but magnification and resolution may be affected
Solution Approach 1:
The patent optimizes the ratio of numerical aperture to working distance (0.20≤NA×f/WD≤0.26) to maintain adequate magnification and resolution while ensuring sufficient working distance for practical operation. The working distance WD is defined as the distance from the objective surface to the specimen, and this parameter relationship enables balanced performance across all three dimensions of magnification, resolution, and usability.
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 lens achieves low aberration, high resolution, and a compact design with a long working distance, suitable for high-pixel microscopes, improving observation quality and user convenience.
Implementation Method 1
a first lens L1 having a positive refractive force; a second lens L2 having a positive refractive force; a third lens L3 having a negative refractive force; a fourth lens L4 having a negative refractive force; a fifth lens L5 having a positive refractive force; a sixth lens L6 having a negative refractive force; a seventh lens L7 having a negative refractive force; an eighth lens L8 having a negative refractive force; a ninth lens L9 having a positive refractive force; a tenth lens L10 having a negative refractive force; an eleventh lens L11 having a positive refractive force; and a twelfth lens L12 having a positive refractive force
Data Source
AI summary
Disclosed is a microscope objective lens including from an emitting side to an objective side: the first lens to the twelfth lens. The focal length of the microscope objective lens is f, the numerical aperture is NA, and the working distance is WD. A focal length of a lens group consisting of the first lens to the fourth lens is f1−4, and a combined focal length between the seventh lens and the eighth lens is f78. The on-axis distances of the seventh and the eighth lens are d13 and d15, and an on-axis distance from the seventh lens to the eighth lens is d14. The central radiuses of curvature of the emitting surface and the objective surface of the eleventh lens are R21 and R22, respectively. The following relationship expressions are satisfied: 0.09≤f1−4/f≤0.15; −1.35≤f78/(d13+d14+d15)≤−0.95; −7.00≤R21/R22≤−2.00; 0.20≤NA*f/WD≤0.26. This microscope objective lens has excellent optical characteristics, and low aberration.