Stereoscopic Endoscope Objective Optical System Design
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Solution Overview
Problem
Conventional stereoscopic vision endoscope optical systems face challenges in achieving a wide angle of view and appropriate stereoscopic effect while maintaining a compact size, often requiring large lens diameters and distances that compromise optical system size and effective aperture.
Innovation Solution
The proposed stereoscopic vision endoscope objective optical system consists of a first lens group with negative refractive power, a second lens group with positive refractive power, and a rear-side lens group with positive refractive power, where the first and second lens groups are aligned to share an optical axis, and the rear-side lens group includes subgroups with negative and positive lenses, satisfying specific conditional expressions to optimize focal lengths and refractive powers for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a pair of optical systems is disposed in parallel to achieve stereoscopic vision, then stereoscopic information can be acquired, but the optical system size increases and effective aperture is reduced
Solution Approach 1:
The patent combines two optical systems for stereoscopic vision into a single integrated optical system. The first and second optical systems share common optical components including the first lens group, second lens group, and rear lens group, with the aperture stop being common to both systems. This merging approach enables acquisition of stereoscopic information through parallax between differently directed light beams while significantly reducing the overall optical system size and maintaining effective aperture.
2Loss of information
If lens groups are disposed side-by-side in parallax direction, then stereoscopic effect is achieved, but optical system size and lens diameter increase
Solution Approach 1:
The patent transitions from a conventional side-by-side arrangement of optical systems in the parallax direction to a configuration where optical systems are directed along different paths through strategic lens group positioning. The first and second rear groups are disposed at different positions in the parallax direction, while the first and second optical systems share common front lens groups. This dimensional reorganization achieves the required stereoscopic effect while reducing optical system length and avoiding excessive lens diameters.
3Area of stationary object
If a wide angle of view is achieved, then wide range observation is possible, but optical system complexity and size increase
Solution Approach 1:
The patent applies different optical configurations to different regions of the optical system to achieve wide angle of view. The first lens group has negative refractive power to expand the angle of view, while the second lens group has positive refractive power to focus light. The rear lens groups are positioned at different locations to capture light beams from different directions. This localized optimization of optical properties in different regions achieves wide angle of view without excessive overall system complexity.
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 secures a wide angle of view, reduces the optical system size, and achieves an appropriate stereoscopic effect by controlling the inclination of off-axis principal light rays, allowing for both wide-angle observation and magnified imaging with improved image quality and reduced aberrations.
Implementation Method 1
a first lens group having a negative refractive power, a second lens group having a positive refractive power
Data Source
AI summary
A stereoscopic vision endoscope objective optical system includes, in order from an object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a rear-side lens group having a positive refractive power. The rear-side lens group includes a first rear group and a second rear group. The first lens group and the second lens group are disposed so that an optical axis of the second lens group coincides with an optical axis of the first lens group. The optical axis of the first lens group is located between an optical axis of the first rear group and an optical axis of the second rear group. Each of the first rear group and the second rear group includes a first sub group, an aperture stop, and a second sub group, and the first sub group includes a negative lens.