Dual-View Endoscope Optics for Real-Time Side and Forward Imaging
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Solution Overview
Problem
Conventional endoscopes suffer from limited field of view and require repositioning to capture images from different sides of an internal cavity, leading to prolonged procedures and patient discomfort.
Innovation Solution
A dual view endoscope with a functional module comprising a meniscus lens and a freeform lens that simultaneously captures forward-view and side-view images in real-time, using a meniscus lens to expand the field of view and a freeform lens to deflect light rays from lateral directions onto an image sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional forward-viewing endoscope is used, then the structure is simple, but the field of view is limited and objects behind bulge structures cannot be detected
Solution Approach 1:
The endoscope is divided into multiple imaging systems: a forward-viewing imaging system and one or more oblique-viewing imaging systems. Each imaging system has its own image sensor and optical path, allowing simultaneous capture of images from different directions without requiring a single complex lens to handle all viewing angles
Solution Approach 2:
The patent introduces oblique viewing angles by adding imaging systems that view the cavity at angles other than directly forward. This adds a dimensional aspect to the field of view, allowing visualization of surfaces that are not visible to a forward-only camera, such as areas behind bulges or folds
2Adaptability or versatility
If an oblique-viewing endoscope with a prism is used, then objects behind bulge structures can be captured, but the alignment tolerance is tight and manufacturing is difficult
Solution Approach 1:
The patent removes the prism component from the optical system and replaces it with a direct oblique-viewing imaging module. This extraction of the prism eliminates the need for tight alignment tolerances and complex manufacturing processes associated with prisms, while still achieving the desired oblique viewing capability through dedicated imaging sensors positioned at appropriate angles
Solution Approach 2:
Instead of using a single forward-viewing sensor with complex optical elements, the patent employs multiple image sensors that directly capture images from different viewing angles. This copying approach uses simpler optical paths for each sensor, reducing manufacturing complexity and alignment requirements compared to a single complex optical system
3Adaptability or versatility
If an oblique-viewing endoscope is used, then side views can be captured, but only one side can be imaged at a time requiring repositioning
Solution Approach 1:
The patent merges multiple imaging systems (forward-viewing and one or more oblique-viewing systems) into a single endoscope assembly. This combination allows simultaneous capture of images from multiple directions, eliminating the need to reposition the endoscope to view different sides of the cavity and reducing overall procedure time
4Adaptability or versatility
If an oblique-viewing endoscope is used, then blind spots are reduced, but the device complexity increases
Solution Approach 1:
The optical system is segmented into separate forward-viewing and oblique-viewing imaging modules, each with its own image sensor and simplified optical path. This segmentation avoids the need for a single complex optical system that would require sophisticated elements like prisms or multiple lenses, while still achieving comprehensive visual coverage
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
Enables simultaneous real-time capture of both forward and side views, simplifies assembly, reduces manufacturing costs, and facilitates mass production through injection molding and lens replication.
Implementation Method 1
The first lens is a meniscus lens having two surfaces, one surface has planar shape (planar surface) and the other surface has spherical or aspherical shape (spherical or aspherical surface)... The first lens is configured to expand field of view of the image sensor
Implementation Method 2
The second lens is a freeform lens having two surfaces, one surface has planar shape (planar surface) and the other surface has freeform shape (freeform surface)... The second lens is configured to collect light rays from lateral directions and deflect the light rays into the image sensor
Data Source
AI summary
A dual view endoscope includes an image sensor and a functional module disposed in front of the image sensor, the functional module having at least the first lens and the second lens attached to the first lens. The second lens located between the first lens and the functional module. The first lens is configured to expand field of view of said image sensor, while the second lens is configured to collect light rays from lateral directions and deflect the light rays into the image sensor. The image sensor and functional module are aligned with an axial direction of the dual view endoscope.