Optical Distance Measuring Device Uniform Detectivity
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Solution Overview
Problem
Commercial optical distance-measuring devices experience varying detectivity within a scanning range due to angle-dependent detectivity of detecting elements, leading to unstable measurement results.
Innovation Solution
The optical distance-measuring device incorporates a light emitter with multiple light-emitting areas and an optical system that deflects light beams in different directions, paired with a detector featuring detecting elements whose directions are intentionally varied to minimize angle-dependent detectivity, ensuring consistent light detection across the scanning range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detecting elements are arranged with uniform detecting directions, then the device structure is simple, but the detectivity varies within the scanning range due to angle dependence
Solution Approach 1:
The patent applies local quality by assigning different detecting directions to different detecting elements based on their positions. Specifically, detecting elements are configured with detecting directions that correspond to respective light incident angles, allowing each element to optimally detect light at its specific location in the scanning range, thereby achieving uniform detectivity across the entire scanning range.
Solution Approach 2:
The patent changes the parameter of detecting direction for different detecting elements. By varying the detecting direction parameter according to the light incident angle at each position, the system compensates for angle-dependent detectivity variations and maintains consistent detection performance across the scanning range.
2Measurement precision
If detecting elements have different detecting directions, then detectivity uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent makes each detecting element have a detecting direction adapted to its local light incident angle conditions. This local optimization ensures that each element operates at peak sensitivity for its specific position, directly improving distance measurement accuracy while the overall system remains manageable through this localized approach.
3Area of stationary object
If the optical system deflects light beams in different directions, then the scanning coverage is expanded, but the detectivity variation across the scanning range increases
Solution Approach 1:
The patent compensates for the detectivity variation caused by different light incident angles across the scanning range by changing the detecting direction parameter of each detecting element. This parameter adjustment counteracts the angle-dependent detectivity changes, maintaining consistent detection performance throughout the expanded scanning range.
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 stabilizes measurement results by maintaining uniform detectivity across the scanning range, reducing the impact of angle-dependent light detection and enhancing the accuracy of distance measurements.
Implementation Method 1
an optical system configured to cause light beams respectively emitted from the plurality of light-emitting areas to be deflected in respectively different directions
Implementation Method 2
a detector including a plurality of detecting elements configured to detect the reflection of light outgoing from the optical system
Data Source
AI summary
An optical distance-measuring device includes: a light emitter having plural light-emitting areas that are arrayed in a first direction; an optical system provided at a position toward which the light emitter emits light, the optical system causing light beams respectively emitted from the plural light-emitting areas to be deflected in respectively different directions; and a detector including plural detecting elements configured to detect a reflection of light outgoing from the optical system. Detecting directions of some of the plural detecting elements are different from detecting directions of others of the plural detecting elements in the first direction.