Off-Axis Parabolic Mirror Imaging for Stable Convergence Adjustment
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Solution Overview
Problem
Existing stereo camera configurations that change convergence angle by rotating a plane mirror about the geometric center cause a shift in the imaging range, requiring additional image processing or camera movement, which prolongs measurement time.
Innovation Solution
The use of an off-axis parabolic mirror with a driving mechanism that changes the positions of the imaging element and imaging optical system to adjust the convergence angle without shifting the imaging range, maintaining the focal position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plane mirror rotates about the geometric center to change the convergence angle, then the convergence angle can be adjusted, but the imaging range shifts significantly
Solution Approach 1:
The patent introduces an off-axis parabolic mirror as an intermediary optical element between the imaging lens and the plane mirror. This off-axis parabolic mirror receives light from the imaging lens and redirects it to the plane mirror, serving as a mediator that decouples the convergence angle adjustment function from the imaging range position. By using this intermediary, the system can adjust the convergence angle without causing the imaging range to shift, as the off-axis parabolic mirror maintains a fixed focal position while allowing angular adjustment.
2Measurement precision
If the convergence angle is changed by rotating the plane mirror, then distance resolution can be adjusted, but additional image processing or camera movement is required
Solution Approach 1:
The off-axis parabolic mirror acts as an intermediary that enables independent adjustment of the convergence angle without affecting the imaging range position. This allows the system to change distance resolution by adjusting the convergence angle while keeping the imaging range stationary, eliminating the need for additional image processing or camera movement to track objects, thereby reducing measurement time.
Solution Approach 2:
The patent configures the off-axis parabolic mirror and plane mirror system in advance to work together for convergence angle adjustment. The off-axis parabolic mirror is positioned and oriented beforehand to receive light from the imaging lens and redirect it to the plane mirror, which is pre-configured to rotate about its center. This preliminary arrangement ensures that when the plane mirror rotates to adjust the convergence angle, the imaging range remains stable, and objects remain within the field of view without requiring subsequent corrective actions.
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 allows for easy adjustment of distance resolution by changing the convergence angle without altering the imaging range, thereby reducing measurement time.
Implementation Method 1
The imaging optical system includes at least an off-axis parabolic mirror. The driving mechanism is configured to change positions of the imaging element and the part of the imaging optical system so as to change an imaging direction while maintaining a focal position of the off-axis parabolic mirror.
Data Source
AI summary
An imaging unit includes an imaging element, an imaging optical system that includes an off-axis parabolic mirror, and a driving mechanism. A reflective surface of the off-axis parabolic mirror is configured to face an object. The driving mechanism is configured to change positions of the imaging element and a part of the imaging optical system so as to change an imaging direction of the imaging unit while maintaining a position of a focal point of the off-axis parabolic mirror.