Observation Optical System Cemented Lens Annular Mirror
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Solution Overview
Problem
Conventional observation optical systems that enable simultaneous forward and backward observation often suffer from chromatic aberration and bulkiness, particularly in endoscope applications, where achieving high-quality images of both fields with minimal oversight of lesions behind tissue folds is challenging.
Innovation Solution
The optical system comprises a negative lens unit with a cemented achromatic lens, an annular reflecting mirror, and an imaging lens unit, where the negative lens unit and annular reflecting mirror are cemented, and a common aperture stop is used for both observation systems, allowing for separate imaging of forward and backward fields on the same plane while minimizing chromatic aberration and system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide-angle lens and curved-surface-shaped reflecting mirror are used for omnidirectional observation, then both forward and backward visual information can be imaged, but chromatic aberration occurs and the system becomes bulky
Solution Approach 1:
The patent combines the wide-angle lens and curved-surface-shaped reflecting mirror into a single integrated observation optical system that shares a common imaging plane and aperture stop. The wide-angle lens images forward visual information while the curved-surface-shaped reflecting mirror images backward visual information, and both are superimposed on the same imaging plane, achieving omnidirectional observation without requiring separate systems.
Solution Approach 2:
The patent designs the observation optical system to perform multiple functions simultaneously: the wide-angle lens serves as the objective for forward observation, the curved-surface-shaped reflecting mirror serves as the objective for backward observation, and both share a common aperture stop and imaging plane, making the system universal for omnidirectional monitoring.
2Measurement precision
If separate optical systems are used for forward and backward observation, then imaging quality can be maintained, but the system becomes complex and bulky
Solution Approach 1:
The patent merges the forward observation optical path (through the wide-angle lens) and the backward observation optical path (through the curved-surface-shaped reflecting mirror) into a single integrated system that shares the aperture stop and imaging plane, reducing structural complexity while maintaining imaging quality for both directions.
Solution Approach 2:
The patent utilizes the spatial dimension by positioning the curved-surface-shaped reflecting mirror at the lower portion of the wide-angle lens, allowing backward visual information to be captured and imaged on the same imaging plane as forward information, effectively using vertical space to accommodate dual observation paths without increasing horizontal footprint.
3Volume of stationary object
If a common camera is used to image both forward and backward visual information, then system size is reduced, but dead angles are created
Solution Approach 1:
The patent positions the curved-surface-shaped reflecting mirror at the lower portion of the wide-angle lens in advance, so that backward visual information can be reflected and imaged on the imaging plane alongside forward information. This preliminary positioning of the mirror eliminates dead angles by ensuring that both forward and backward visual fields are captured within the same field of view before imaging occurs.
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 high-quality simultaneous observation of forward and backward visual fields with reduced chromatic aberration and system size, enhancing the detection of lesions behind tissue folds, particularly in endoscope applications like the large intestine, by ensuring accurate and compact imaging.
Implementation Method 1
a negative lens unit including a cemented lens, arranged at the most object-side position
Implementation Method 2
an annular reflecting mirror placed on the image side of the negative lens unit, with a reflecting surface facing the image side
Data Source
AI summary
An observation optical system has a negative lens unit including a cemented lens, arranged at the most object-side position; an annular reflecting mirror placed on the image side of the negative lens unit, with a reflecting surface facing the image side; and an imaging lens unit arranged on the image side of the negative lens unit and the annular reflecting mirror.