Six-Lens Microscope Objective for Low Distortion and Long Working Distance
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Solution Overview
Problem
Conventional microscope lenses suffer from distortions, limited working distance, and inadequate magnification due to optical structural constraints, which hinder effective observation.
Innovation Solution
A microscope objective lens design comprising six lenses with specific refractive forces and curvature relationships, including a first positive lens, a second negative lens, and a third positive lens, with defined curvature and thickness ratios, to achieve low distortion and a long working distance.
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 lens increases and working distance decreases
Solution Approach 1:
The optical system is divided into six separate lenses with specific refractive forces arranged in sequence. Each lens is designed to contribute specific optical functions, allowing the system to achieve high imaging quality while maintaining a compact total length that preserves working distance. The segmentation enables independent optimization of each lens element.
Solution Approach 2:
The patent applies specific parameter relationships between lens curvatures, thicknesses, and refractive indices to optimize the system. By controlling parameters such as the ratio of radii of curvature (R11/R12), thickness ratios (d5/d4), and focal length ratios (f5/f), the design achieves high magnification and imaging quality while maintaining a long working distance relative to the total lens length.
2Ease of manufacture
If conventional optical structures are used, then manufacturing is simpler, but distortion occurs within the microscopic range
Solution Approach 1:
Different regions of the optical system are designed with different local characteristics. Each lens element has specific curvature radii and thicknesses optimized for its position in the sequence. The emitting surface of the first lens, objective surface of the first lens, and subsequent lens surfaces each have tailored parameters to correct specific types of distortion at their location in the optical path.
Solution Approach 2:
The system uses multiple lens elements with different refractive indices and optical properties arranged in a composite structure. The combination of lenses with different characteristics (positive and negative refractive forces) allows the system to correct optical aberrations and minimize distortion while maintaining manufacturability through standard optical glass materials.
3Ease of operation
If the working distance is increased, then observation convenience is improved, but magnification is reduced
Solution Approach 1:
The optical system is designed with adjustable parameters that allow optimization for different working conditions. The relationship expressions provide design flexibility to adjust the balance between working distance and magnification based on specific application requirements, enabling the system to adapt to different observation needs while maintaining high imaging quality.
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 design achieves excellent optical performance with low distortion, 4.7-5 times magnification, and a long working distance, suitable for optical microscopes.
Implementation Method 1
a first lens having a positive refractive force; a second lens having a negative refractive force; a third lens having a positive refractive force; a fourth lens having a positive refractive force; a fifth lens having a negative refractive force; and a sixth lens having a positive refractive force
Data Source
AI summary
The present application relates to the field of optical lenses, and in particular, relates to a microscope objective lens suitable for use in a device such as a microscope. The microscope objective lens includes in order from an emitting side to an objective side: a first lens having a positive refractive force, a second lens having a negative refractive force, a third lens having a positive refractive force, a fourth lens having a positive refractive force, a fifth lens having a negative refractive force, and a sixth lens having a positive refractive force. The following relationship expressions are satisfied: −5.00≤R11/R12≤−1.50; 0.40≤WD/TTL≤0.60; 1.00≤R1/((n1−1)*f)≤4.00; 2.00≤d5/d4≤6.00. The microscope objective lens of the present application lens has excellent optical performance, low distortion, and a long working distance, which is particularly suitable for optical microscope.