Multi-Beam Illumination Layout for Uniform Distance Sensing
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Solution Overview
Problem
Existing distance measurement technologies face challenges in achieving accurate distance measurement due to non-uniform light intensity distribution when multiple light beams overlap, leading to decreased measurement accuracy.
Innovation Solution
The illumination device employs a configuration where the angle formed by adjacent light beam centers is set equal to the angle at which the beam intensity becomes a predetermined intensity, using a plurality of light emission units arranged in an array with specific beam profiles, such as rectangular or square shapes, to ensure uniform light distribution and enhance measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light beams are emitted from light emission units to measure distance, then distance measurement capability is enabled, but non-uniform light intensity distribution occurs at overlapping regions leading to decreased measurement accuracy
Solution Approach 1:
The patent applies local quality by making different parts of the light beam have different intensity characteristics. Specifically, the light beam is designed with a flattened top profile where the central region maintains substantially constant intensity, while the peripheral regions have lower intensity. This local differentiation prevents the non-uniformity problem at overlapping regions while maintaining sufficient illumination for distance measurement.
Solution Approach 2:
The patent changes the intensity distribution parameter of the light beam from a conventional Gaussian profile to a flattened top profile. By modifying the beam intensity parameter through optical elements or laser cavity design, the patent achieves uniform light distribution at overlapping regions while maintaining the ability to perform accurate distance measurements.
2Power
If light beam intensity is concentrated at the center for strong signal, then measurement signal strength is improved, but non-uniform distribution causes overlap regions to have insufficient intensity
Solution Approach 1:
The patent applies local quality by making different parts of the light beam have different intensity characteristics. Specifically, the light beam is designed with a flattened top profile where the central region maintains substantially constant intensity, while the peripheral regions have lower intensity. This local differentiation prevents the non-uniformity problem at overlapping regions while maintaining sufficient illumination for distance measurement.
Solution Approach 2:
The patent changes the intensity distribution parameter of the light beam from a conventional Gaussian profile to a flattened top profile. By modifying the beam intensity parameter through optical elements or laser cavity design, the patent achieves uniform light distribution at overlapping regions while maintaining the ability to perform accurate distance measurements.
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 suppresses the decrease in beam intensity at overlapping regions, resulting in improved distance measurement accuracy and resolution by maintaining uniform light intensity across the target area.
Implementation Method 1
a light emitting element including a plurality of light emission units
Implementation Method 2
a light receiving unit that receives reflected light reflected from a target object
Data Source
AI summary
For example, a decrease in beam intensity at a portion where beam profiles overlap in uniform irradiation is suppressed. Provided is an illumination device including a light emitting element including a plurality of light emission units, in which, when an irradiation target object is irradiated with a light beam emitted from the plurality of light emission units, in a case where a portion corresponding to a center of the light beam is set as a light beam center, and predetermined two light beam centers are set as a first light beam center and a second light beam center, and in a case where an angle formed by the first light beam center and the second light beam center with respect to the light emitting element is set as a first angle, and an angle at which a beam intensity of a beam profile corresponding to the first light beam center becomes a predetermined intensity in an extending direction of a line including the first light beam center and the second light beam center is set as a second angle, the first angle is substantially equal to the second angle.