Stereoscopic Optical System Entrance Pupil Positioning
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Solution Overview
Problem
Existing optical systems for stereoscopic vision in endoscopes face challenges in maintaining consistent stereoscopic effect across varying object distances due to changes in pupil distance, leading to fluctuations in the angle of convergence and stereoscopic effect.
Innovation Solution
The optical system incorporates a pair of optical systems with movable lens units that adjust to focus on both near and far points, ensuring that the entrance pupils remain on the image side during focusing, and satisfies specific conditional expressions to control the movement and positioning of lens units and entrance pupils, thereby maintaining an optimal inward angle and reducing system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distance between the two stops is varied to change the angle of convergence and stereoscopic effect, then the stereoscopic effect can be adjusted for different object distances, but the system size increases and the structure becomes more complex
Solution Approach 1:
The patent applies the dynamics principle by making the lens units movable instead of fixed. The first and second lens units can move along the optical axis to adjust the position of the entrance pupils, thereby changing the angle of convergence and stereoscopic effect dynamically without requiring mechanical adjustment of the stops distance. This resolves the contradiction by achieving adaptability through dynamic optical element positioning rather than structural reconfiguration.
Solution Approach 2:
The patent employs parameter changes by varying the focal lengths and positions of the movable lens units to achieve different stereoscopic effects. By changing the optical parameters (focal length, object distance, lens position) rather than the physical distance between stops, the system maintains a compact structure while providing adjustable stereoscopic vision for near and far objects.
2Stability of the object's composition
If a pair of optical systems with movable lens units is used to maintain consistent stereoscopic effect, then the stereoscopic effect remains stable across focusing ranges, but the system size increases
Solution Approach 1:
The patent merges the functions of multiple optical components into a coordinated system. The first and second lens units work together, with their movements linked to maintain the conditional expression relationship. This merging allows the system to achieve stable stereoscopic effect across focusing ranges while keeping the overall volume compact, as the lens units share the adjustment burden rather than requiring separate adjustment mechanisms.
Solution Approach 2:
The patent uses dynamic positioning of the movable lens units to maintain consistent stereoscopic effect. By allowing the lens units to move and adjust their positions dynamically during focusing, the system maintains stable entrance pupil positions relative to the object, achieving stereoscopic consistency without requiring a larger fixed structure.
3Manufacturing precision
If the entrance pupils are positioned on the image side during focusing to maintain optimal inward angle, then the stereoscopic effect is optimized, but the lens unit movement range increases
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratios and position relationships of the lens units. By carefully selecting and adjusting optical parameters (focal lengths, object distances, image distances) to satisfy the conditional expression, the system achieves precise entrance pupil positioning with minimal lens movement range, resolving the contradiction between positioning precision and movement extent.
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 solution allows for a consistent stereoscopic effect across different object distances without significantly increasing the system size, enabling a wide field of view and reducing observer fatigue by maintaining appropriate depth and resolution in stereoscopic images.
Implementation Method 1
an optical element, wherein the first optical system and the second optical system are disposed on an image side of the optical element... the optical element is positioned to intersect both an optical axis of the first optical system and an optical axis of the second optical system
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 stop and a plurality of lens units. The plurality of lens units includes at least one movable lens unit which moves at the time of focusing, and at least focusing to a near point and focusing to a far point is carried out by movement of the movable lens unit. At the time of focusing to a near point, both a first entrance pupil and a second entrance pupil are positioned on an image side of positions at the time of focusing to a far point. Here, the first entrance pupil is an entrance pupil of the first optical system, and the second entrance pupil is an entrance pupil of the second optical system.