Scanner Mirror Angular Offset Stabilizes Light Reception
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Solution Overview
Problem
The existing ranging devices using vibrating mirror modules with light receiving mirrors aligned in the same plane experience significant fluctuations in light reception, leading to inconsistent measurement accuracy due to varying effective light receiving surface areas as the mirrors pivot, resulting in pronounced differences in signal-to-noise ratios.
Innovation Solution
The proposed solution involves a scanner mirror configuration with first and second reflectors having light receiving faces that are angularly offset about a pivot axis, allowing them to pivot together while maintaining a relative positional relationship, ensuring a consistent effective light receiving surface area and reducing light reception fluctuations, with optimal offset angles between 75 to 105 degrees, particularly 90 degrees, to stabilize the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If two light receiving mirrors are aligned in the same plane and pivoted together, then the light receiving surface area increases, but the effective light receiving surface area fluctuates significantly during scanning
Solution Approach 1:
The light receiving mirror is divided into two separate reflectors (first reflector and second reflector) that are angularly offset from each other. Each reflector independently receives light from different angular positions, preventing the effective receiving area from fluctuating during scanning. This segmentation resolves the contradiction by maintaining a constant effective light receiving area while improving measurement precision.
2Use of energy by moving object
If two light receiving mirrors are aligned in the same plane, then the light receiving capability is enhanced, but the signal-to-noise ratio fluctuates during scanning
Solution Approach 1:
By dividing the light receiving function into two angularly offset reflectors, each reflector maintains a stable effective receiving area during scanning. This prevents the signal-to-noise ratio from fluctuating, thereby enhancing reliability while preserving light receiving capability.
Solution Approach 2:
Each reflector is positioned at a specific angular offset to receive light from particular directions. This local specialization ensures that at any scanning angle, at least one reflector maintains optimal light reception, stabilizing the signal-to-noise ratio throughout the scanning range.
3Ease of operation
If light receiving mirrors are displaced during scanning, then the scanning function is achieved, but the effective light receiving surface area repeatedly increases and decreases
Solution Approach 1:
The scanning function is achieved by displacing two angularly offset reflectors simultaneously. Their angular offset ensures that as one reflector's effective area decreases during scanning, the other's increases, maintaining a constant total effective light receiving area.
Solution Approach 2:
The two reflectors are positioned asymmetrically with an angular offset (preferably 90 degrees) between them. This asymmetric arrangement ensures that their effective receiving areas complement each other during scanning, preventing fluctuations while maintaining the scanning function.
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 significantly reduces the fluctuation range of light received by the photodetector, enhancing measurement accuracy and uniformity across the pivot angle range by ensuring that the light receiving surface areas complement each other, thereby stabilizing the signal-to-noise ratio.
Implementation Method 1
a scanner mirror including a reflecting mirror having first and second reflectors that are pivotally arranged about a pivot axis, the first and second reflectors having light receiving faces, respectively
Data Source
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AI summary
A scanner mirror (30) includes a reflecting mirror (50) and a driver. The reflecting mirror (50) has first (51) and second reflectors (52) that are pivotally arranged about a pivot axis (150). The first and second reflectors have light receiving faces, respectively. The light receiving faces face in directions that are angularly offset with each other about the pivot axis (150). The driver is configured to drive the reflecting mirror (50) to pivot the first and second reflectors within a specific angle range.