Microscope Image Formation Lens Layout for Wide-Field Resolution
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Solution Overview
Problem
Existing image formation lenses for microscopes face challenges in achieving high resolution while maintaining a wide field of view, as they struggle to balance numerical aperture, aberration correction, and chromatic aberration.
Innovation Solution
The microscope optical system employs a specific configuration of lens groups, including a cemented lens, a second lens group with positive refractive power, and a third lens group with negative refractive power, adhering to conditional expressions that optimize the relationship between the pupil diameter of the objective lens and the focal length of the image formation lens, thereby enhancing resolution and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the numerical aperture is increased to improve resolution, then the resolution is improved, but the field of view becomes narrower
Solution Approach 1:
The image formation lens is divided into multiple lens groups (first lens group with positive refractive power, second lens group with negative refractive power, and third lens group with positive refractive power). Each lens group is optimized to handle specific aspects of light correction, allowing the system to achieve both high resolution through effective numerical aperture utilization and wide field of view through distributed aberration correction across the segmented lens groups.
2Measurement precision
If the numerical aperture is increased to improve resolution, then the resolution is improved, but chromatic aberration increases
Solution Approach 1:
The patent employs composite lens structures where the first lens group includes a positive lens and a negative lens made of different glass materials with different dispersion characteristics. This composite arrangement allows the system to achieve high numerical aperture for improved resolution while the different glass materials work together to correct chromatic aberration through their complementary optical properties.
Solution Approach 2:
Different regions of the optical system are assigned different functional qualities. The first lens group with positive refractive power is optimized for converging light and correcting spherical aberration, the second lens group with negative refractive power is optimized for diverging light and correcting chromatic aberration, and the third lens group with positive refractive power is optimized for final image formation. This local optimization allows the system to achieve high resolution while controlling chromatic aberration.
3Measurement precision
If the numerical aperture is increased to improve resolution, then the resolution is improved, but spherical aberration increases
Solution Approach 1:
The image formation lens is divided into multiple lens groups (first lens group with positive refractive power, second lens group with negative refractive power, and third lens group with positive refractive power). Each lens group is optimized to handle specific aspects of light correction, allowing the system to achieve both high resolution through effective numerical aperture utilization and wide field of view through distributed aberration correction across the segmented lens groups.
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 the production of lenses with improved aberration correction and high resolution, enabling microscopes to capture detailed images over a wide field of view effectively.
Implementation Method 1
an objective lens that converts light from an object into parallel light
Implementation Method 2
an image formation lens that forms an image from the light from the objective lens
Data Source
AI summary
This microscope optical system comprises an objective lens that collimates light from an object, and an image formation lens (IL) that forms an image of light from the objective lens. The image formation lens (IL) comprises a first lens group (G1) having a cemented lens (CL11), a second lens group (G2) having positive refractive power, and a third lens group (G3) having negative refractive power, which are arranged in order from the object side, and satisfies the following conditional expression. 0.1<Φen/f<0.2 where Φen is the pupil diameter of the objective lens, and f is the focal length of the image formation lens (IL).