Stereoscopic Endoscope Optical System with Adjustable Stops
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Solution Overview
Problem
Existing optical systems for stereoscopic vision face challenges in achieving a balanced stereoscopic effect and wide angle of view while maintaining adequate aberration correction and depth resolution, particularly in varying pupil distances and object distances.
Innovation Solution
The optical system comprises identical first and second optical systems with a front unit including a negative lens nearest to the object, a stop that moves parallel to the optical axes, and specific conditional expressions to ensure optimal focal lengths, stop positions, and refractive powers, allowing for adjustable stereoscopic effect and wide angle of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the distance between the two stops is increased to achieve a wider angle of view, then the angle of view is improved, but the depth resolution deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the distance between the two stops (pupils) based on the object distance. When the object is far, the stops are positioned farther apart to provide a wider angle of view. When the object is near, the stops are positioned closer together to maintain high depth resolution. This dynamic parameter adjustment resolves the contradiction between angle of view and depth resolution.
2Adaptability or versatility
If the pupil distance is varied to adjust the stereoscopic effect, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the functions of stereoscopic effect adjustment and focus adjustment into a single integrated system. By combining the pupil distance conversion mechanism with the existing optical system, the patent achieves adaptable stereoscopic effects without significantly increasing device complexity. The stop positions are adjusted in coordination with focus changes, allowing one system to serve multiple functions.
3Device complexity
If a single optical system with pupil divider is used to reduce device complexity, then the device complexity is reduced, but the ability to achieve wide angle of view and high depth resolution simultaneously deteriorates
Solution Approach 1:
The patent segments the optical system into two separate but identical optical systems, each with its own stop. This segmentation allows independent optimization of each optical path while maintaining overall system simplicity. By having two separate systems rather than one divided system, the patent achieves both wide angle of view and high depth resolution simultaneously without significant increase in 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 enables high depth resolution over a wide range with adjustable stereoscopic effect, minimizing aberrations and maintaining a compact system size, suitable for applications like endoscopes.
Implementation Method 1
each of the two font units includes a first negative lens, the first negative lens is a lens positioned nearest to an object
Implementation Method 2
a stop, both the stops move to be drawn away from a central axis or move to come closer to the central axis
Data Source
AI summary
An optical system for stereoscopic vision includes a first optical system and a second optical system. Each of the first optical system and the second optical system includes a front unit, a stop, and a rear unit having a positive refractive power. Each of the two front units includes a first negative lens, and the first negative lens is a lens positioned nearest to an object. Each of the two stops moves in a direction parallel to a plane including an optical axis of the first optical system and an optical axis of the second optical system. Both the stops move to be drawn away from a central axis or move to come closer to the central axis, and the following conditional expressions (1) and (2) are satisfied:−20.0<FLFGn1/IH<−0.5 (1)1.5<Ls/IH<7.5 (2).