Multi-Light Distance Sensing for Continuous Mirror Scanning
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Solution Overview
Problem
When a plurality of light sources are reflected by a single mirror to widen the scanning range, their respective scanning ranges distort differently, resulting in reduced continuity of the scanning ranges.
Innovation Solution
A distance measuring apparatus is designed with multiple light sources, where the direction of the scanning area is defined by a first axis orthogonal to the mirror's center of rotation, and the angles of projection for each light source are adjusted to ensure that the scanning ranges maintain continuity by using specific angle relationships between the optical axes and the mirror axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a plurality of light sources are used to widen the scanning range, then the scanning area is expanded, but the scanning ranges distort differently and continuity is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the angular positions of multiple light sources relative to the mirror's rotation axes. Specifically, the optical axes of the light sources are positioned at different angles with respect to the first and second axes, creating deliberately asymmetric angular parameters. This asymmetric angular configuration ensures that when the mirror rotates, the scanning ranges of different light sources maintain proper continuity without distortion, resolving the contradiction between expanded scanning area and scanning range continuity.
2Area of stationary object
If multiple light sources are reflected by a single mirror, then the scanning range is widened, but the distortion of scanning ranges increases
Solution Approach 1:
The patent employs asymmetry by positioning the optical axes of multiple light sources at different asymmetric angles relative to the mirror's rotation axes. Rather than symmetric positioning, the optical axes are arranged such that each light source forms different angles with the first axis and second axis. This asymmetric angular arrangement compensates for the differential distortion that would otherwise occur, allowing the expanded scanning range to maintain proper shape and continuity across all light sources.
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
The solution improves the continuity of scanning ranges, ensuring that distance images obtained from multiple light sources are continuous and less distorted, enhancing the accuracy and reliability of the distance measurement.
Implementation Method 1
a mirror to reflect the light emitted from the light source
Implementation Method 2
the distance to the object is detected based on the time required from when the laser light is emitted to when a reflection of light is received
Data Source
AI summary
A distance measuring apparatus to measure a distance to an object includes: a plurality of light sources to emit a first light and a second light; a mirror; and a light receiving unit. When the mirror rotates about the first and third axes, an angle formed by an optical axis of the second light projected on the first plane and the second axis is larger than an angle formed by an optical axis of the first light projected on the first plane and the second axis, and an angle formed by the optical axis of the second light projected on the second plane and the second axis is larger than an angle formed by the optical axis of the first light projected on the second plane and the second axis.