Microscope Image Formation Lens Chromatic Aberration Correction
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Solution Overview
Problem
Existing image formation lenses for microscopes struggle to adequately correct chromatic aberration across a wide wavelength range, which affects image quality and resolution.
Innovation Solution
The proposed image formation lens design includes a negative lens and a positive lens, or a positive lens and a negative lens, that satisfy specific conditional expressions regarding Abbe numbers and partial dispersion ratios. These expressions ensure that the lens combinations effectively correct chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lens designs are used, then the device complexity is low, but chromatic aberration correction is insufficient
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the Abbe numbers (νdP, νdN) and partial dispersion ratios (θgFP, θgFN) of the lens materials. By changing these optical parameters within specific ranges, the invention achieves effective chromatic aberration correction across multiple wavelength bands without requiring overly complex lens structures. The conditional expressions establish precise parameter relationships that optimize aberration correction while maintaining practical device complexity.
Solution Approach 2:
The invention employs composite material principles by combining lenses made from materials with different optical properties. Specifically, it uses a positive lens with particular Abbe number and partial dispersion ratio characteristics combined with a negative lens having complementary properties. This composite approach allows the system to correct chromatic aberration through the synergistic interaction of different material properties rather than relying on a single material or simple configuration.
2Measurement precision
If lens parameters are optimized for chromatic aberration correction, then image quality improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific ranges for Abbe numbers and partial dispersion ratios that balance optical performance with manufacturability. By establishing conditional expressions with clear parameter boundaries, the invention provides a practical design space where manufacturing tolerances can be realistically achieved while still obtaining excellent chromatic aberration correction and image quality. This approach avoids overly stringent parameter requirements that would be difficult to manufacture.
3Adaptability or versatility
If a wide wavelength range is covered, then adaptability improves, but chromatic aberration correction becomes more difficult
Solution Approach 1:
The invention addresses wide wavelength coverage by selecting lens materials with specific Abbe number and partial dispersion ratio characteristics that are effective across multiple wavelength bands. The conditional expressions are designed to control chromatic aberration for different wavelength regions simultaneously, enabling the lens system to maintain good correction performance from visible to near-infrared wavelengths. This parameter optimization allows broad spectral adaptability without sacrificing correction quality.
Solution Approach 2:
The patent uses composite material strategies by combining positive and negative lenses with carefully selected dispersion properties. This combination allows the system to correct chromatic aberration across a broad wavelength range by leveraging the complementary dispersion characteristics of different materials. The multi-material approach enables simultaneous correction for multiple wavelength bands, achieving both wide adaptability and effective chromatic aberration control.
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 described lens configurations achieve sufficient correction of chromatic aberration across a wide wavelength range, leading to improved image quality and resolution in microscope applications.
Implementation Method 1
a positive lens that satisfies the following conditional expression: 0.006 < (θgFP - 0.61)/(vdP - 27) - 0.009 < 0.012 where vdP: an Abbe number of the positive lens, and θgFP: a partial dispersion ratio of the positive lens
Implementation Method 2
chromatic aberration sufficiently corrected in a wide wavelength range... where ngP is a refractive index of the positive lens to g-line, nFP is a refractive index of the positive lens to an F-line, and nCP is a refractive index of the positive lens to a C-line
Data Source
AI summary
An image formation lens (IL) for a microscope comprises: a negative lens; and a positive lens (L13) that satisfies the following conditional expression:-0.002×(νdP-35)+0.602-θgFP<023<νdP<65where vdP: an Abbe number of the positive lens, and θgFP: a partial dispersion ratio of the positive lens that is defined by the following expression: θgFP=(ngP−nFP)/(nFP−nCP) where ngP is a refractive index of the positive lens to a g-line, nFP is a refractive index of the positive lens to an F-line, and nCP is a refractive index of the positive lens to a C-line.