Rigid Endoscope Optical System Aberration Correction
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Solution Overview
Problem
Current rigid endoscope optical systems face challenges in achieving high-definition image quality with a wide angle of view and small size, while effectively correcting distortion and chromatic aberration, which are critical for improved diagnostic accuracy in medical diagnostics.
Innovation Solution
The optical system for rigid endoscope comprises an objective optical system with specific lens configurations, including a first lens with negative refractive power and a second lens with positive refractive power, satisfying conditional expressions to control the shape and Abbe number of the first lens, and incorporating a relay optical system with a diffractive optical element to correct chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses in the objective optical system is increased to improve image quality and correct aberrations, then the manufacturing precision and image quality improve, but the device complexity and size increase
Solution Approach 1:
The patent applies parameter changes by specifying precise conditional expressions for lens parameters (focal lengths, radii of curvature, Abbe numbers) to optimize the optical system. By carefully controlling these parameters within specific ranges, the patent achieves high image quality and aberration correction with a reduced number of lenses, resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The patent uses composite optical materials with different Abbe numbers (dispersion characteristics) to correct chromatic aberrations. By combining lenses made from materials with different optical properties, the system achieves superior color correction and image quality without requiring an excessive number of lens elements, thus reducing overall system complexity.
2Measurement precision
If the numerical aperture is increased to improve resolution and image quality, then the measurement precision improves, but the distortion and chromatic aberration become more difficult to correct
Solution Approach 1:
The patent applies local quality by optimizing specific regions of the optical system. The objective optical system is designed with specific lens configurations and parameter ranges that locally address distortion and chromatic aberration issues. By carefully designing the local optical properties of each lens element and their arrangements, the patent achieves high resolution with effective aberration correction across different field regions.
3Adaptability or versatility
If the angle of view is widened to improve diagnostic capability, then the adaptability improves, but the distortion increases and becomes harder to correct
Solution Approach 1:
The patent addresses distortion in wide-angle applications by introducing additional optical dimensions and configurations. The relay optical system and eyepiece optical system are designed with specific arrangements that add optical path dimensions, allowing for distortion correction while maintaining a wide angle of view. This multi-dimensional optical design enables the system to achieve both wide viewing angles and accurate image geometry.
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 the achievement of a high-resolution, high-definition image with a wide angle of view and effective correction of distortion and chromatic aberration, resulting in improved diagnostic accuracy and image quality in medical diagnostics.
Implementation Method 1
incorporating a relay optical system with a diffractive optical element to correct chromatic aberration
Implementation Method 2
a first lens having a negative refractive power, a second lens having a positive refractive power
Data Source
AI summary
An optical system for rigid endoscope includes an objective optical system, an eyepiece optical system, and a relay optical system which is disposed between the objective optical system and the eyepiece optical system. The objective optical system includes in order from an object side, a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, and a fourth lens having a negative refractive power. The following conditional expressions (1) and (2) are satisfied:−3<(RL1i+RL1o)/(RL1i−RL1o)<−1.3 (1)30<νdL1 (2)where,RL1o denotes a radius of curvature of an object-side surface of the first lens,RL1i denotes a radius of curvature of an image-side surface of the first lens, andνdL1 denotes Abbe number for the first lens.