Endoscope Objective Optical System Aberration Correction
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Solution Overview
Problem
Existing endoscope objective optical systems struggle to provide a narrow angle, small outer diameter, and short overall length while simultaneously correcting for field curvature and comatic aberration, which is crucial for surgical procedures where higher magnification is required without compromising the working space or lens clarity.
Innovation Solution
The endoscope objective optical system is designed with a specific configuration including a negative single lens, a positive single lens, an aperture stop, and a positive combined lens, adhering to specific refractive index and focal length conditions to achieve a narrow angle, small diameter, and short length, allowing for simultaneous correction of field curvature and comatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wide-angle endoscope objective optical system is used to achieve higher magnification, then magnification is improved, but the working space decreases and the lens surface is more easily contaminated
Solution Approach 1:
The patent changes the angular parameter of the optical system from wide-angle to narrow-angle configuration. By specifically designing the objective optical system with a narrow angle, the system achieves higher magnification (improving measurement precision) while maintaining adequate working space and reducing lens contamination risk (improving ease of operation). This parameter change resolves the contradiction by selecting the appropriate angular characteristic for surgical applications.
2Volume of moving object
If a narrow-angle endoscope objective optical system is designed to achieve higher magnification and smaller outer diameter, then magnification and compactness are improved, but simultaneous correction for field curvature and comatic aberration becomes difficult
Solution Approach 1:
The patent segments the objective optical system into five distinct lens groups with specific configurations: a concave lens, a convex lens, a stop, another convex lens, and a combined lens. Each lens group is designed with particular refractive powers and arrangements to independently address specific aberrations. This segmentation allows the system to achieve both narrow angle (compactness) and high magnification while simultaneously correcting field curvature and comatic aberration through the coordinated action of individual lens elements.
Solution Approach 2:
The patent employs composite lens structures, particularly the combined lens which integrates multiple lens elements with different refractive properties. By combining lenses with positive and negative refractive powers in specific configurations, the system achieves aberration correction while maintaining the narrow-angle design. The composite structure allows different lens materials and shapes to work together to correct both field curvature and comatic aberration simultaneously.
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 enables a relatively narrow angle, small outer diameter, and short overall length, facilitating improved magnification and reduced contamination risk during surgical procedures by effectively correcting field curvature and comatic aberration.
Implementation Method 1
an endoscope objective optical system includes, in order from an object side, a first lens composed of a negative single lens, a second lens composed of a positive single lens, an aperture stop, a third lens composed of a positive single lens, and a fourth lens composed of a positive combined lens
Data Source
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AI summary
Provided is an endoscope objective optical system that has a relatively narrow angle, a small outer diameter, and a short overall length and that allows simultaneous correction for field curvature and comatic aberration. An endoscope objective optical system (1) includes, in order from an object side, a first lens (2) composed of a negative single lens, a second lens (3) composed of a positive single lens, an aperture stop (4), a third lens (5) composed of a positive single lens, and a fourth lens (6) composed of a positive combined lens. The endoscope objective optical system (1) satisfies the following conditions: (1) 0.3 < Df/f < 1.15, (2) n1 < 1.79, (3) n2 > n1, and (4) 0.6 < IH/f < 0.83 wherein Df is the distance from a surface of the first lens facing the object side to the aperture stop, f is the focal length of the entire system, n1 is the refractive index of the first lens (d-line), n2 is the refractive index of the second lens (d-line), and IH is the maximum image height of the entire system.