Cemented Lens Chromatic Aberration Correction in Rigid Endoscope Relay Systems
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Solution Overview
Problem
Current rigid endoscope optical systems face challenges in achieving high-resolution imaging with minimal chromatic aberration, which degrades image quality due to the significant presence of chromatic aberrations in relay optical systems.
Innovation Solution
A relay optical system is designed with a cemented lens configuration comprising a first meniscus lens and a third lens with differing refractive powers and dispersion ratios, optimized to correct chromatic aberrations through specific conditional expressions for refractive indices and partial dispersion ratios, ensuring minimal degradation of the primary image during relaying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay optical systems are used in rigid endoscope to relay the primary image, then the image can be transmitted from objective lens to eyepiece, but chromatic aberrations occur and degrade image quality
Solution Approach 1:
The relay optical system is divided into multiple lens groups including a cemented lens comprising a positive meniscus lens and a negative lens. This segmentation allows different lens elements to correct different types of chromatic aberrations, with the cemented lens specifically addressing secondary and high-order chromatic aberrations while other lens groups handle primary chromatic aberration correction.
Solution Approach 2:
The invention uses composite lens structures including a cemented lens that combines a positive meniscus lens and a negative lens with specific dispersion properties. The cemented lens acts as a composite optical element that simultaneously corrects multiple types of chromatic aberrations, effectively combining the optical properties of different lens materials and configurations to achieve superior aberration correction.
2Reliability
If multiple relay optical systems are disposed in the optical system for rigid endoscope, then image relay is achieved, but a large portion of the optical system is occupied by relay optical systems
Solution Approach 1:
The relay optical system is designed so that each lens group, particularly the cemented lens, performs multiple functions: correcting primary chromatic aberration, correcting secondary chromatic aberration, correcting high-order chromatic aberration, and maintaining proper image relay. This multi-functionality reduces the need for additional separate correction elements, thereby compacting the overall optical system.
Solution Approach 2:
The invention merges the correction of primary chromatic aberration, secondary chromatic aberration, and high-order chromatic aberration into a single integrated relay optical system design. The cemented lens combines multiple correction capabilities in one element, and the relay optical groups are configured to simultaneously perform image relay and multiple types of aberration correction, reducing the total number of separate components needed.
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 solution effectively corrects chromatic aberrations, including longitudinal, secondary, and high-order chromatic aberrations, leading to improved image quality and reduced occurrence of coma and distortion, thereby enhancing the overall imaging performance of the rigid endoscope.
Implementation Method 1
a cemented lens in which a first lens having a positive refractive power, a second lens having a positive refractive power, and a third lens having a negative refractive power are cemented
Implementation Method 2
the cemented lens is disposed in an optical path of the relay optical system, which is formed by an object-side optical path and an image-side optical path
Data Source
AI summary
A relay optical system includes a cemented lens in which a first lens, a second lens, and a third lens having are cemented. The first lens is a meniscus lens which is adjacent to the third lens, and a dispersion and a partial dispersion ratio differ for the first lens and the third lens. In a rectangular coordinate system in which a horizontal axis is set to be νdLA and a vertical axis is set to be θgFLA, when a straight line expressed by θgFLA=α×νdLA+βLA (where, α=−0.00163) is set, θgFLA and νdLA of medium of the first lens are included in an area determined by the following conditional expression (1) and conditional expression (2), and the following conditional expression (3) is satisfied:0.67≤βLA (1)νdLA<50 (2)−1.4<mg<−0.6 (3).