Multi-Region Light Emitting Apparatus Thermal Saturation
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Solution Overview
Problem
Increasing the duty ratio or duration of pulse light emission in light emitting units for distance measurement apparatuses leads to thermal saturation, affecting output, especially at low currents.
Innovation Solution
A light emitting apparatus with a plurality of regions that perform pulse light emission independently, driven by a unit that ensures multiple emissions with time intervals to avoid thermal saturation, allowing for higher current density and accurate long-distance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the duty ratio is increased to increase light output, then measurement accuracy over long distance is improved, but thermal saturation occurs affecting light output
Solution Approach 1:
The light emitting unit is divided into multiple independently controllable regions. By selectively activating specific regions and controlling their emission timing, the system can distribute thermal load across multiple segments while maintaining sufficient total light output for accurate long-distance measurement.
Solution Approach 2:
The patent implements pulse light emission with specific duty ratios and time intervals. Regions are driven to emit light periodically rather than continuously, allowing thermal dissipation between pulses while maintaining measurement accuracy through accumulated light reception over multiple emission cycles.
2Power
If the duration of pulse light emission is increased to increase output, then light output is improved, but thermal saturation occurs even at low current
Solution Approach 1:
Multiple regions are activated in sequence or parallel with controlled timing. The total light output is maintained by distributing emission across multiple regions rather than extending the duration of emission from a single region, thereby avoiding thermal saturation.
Solution Approach 2:
While individual regions emit light in pulses, the system maintains continuous useful action by coordinating multiple regions. As one region completes its emission cycle and cools, another region can be activated, ensuring continuous light output for measurement while allowing thermal management of individual components.
3Power
If multiple regions are driven to emit light simultaneously, then total light output is increased, but thermal saturation occurs more rapidly
Solution Approach 1:
Regions are driven to emit light in periodic sequences rather than all simultaneously. The control unit coordinates emission timing across regions, creating staggered pulse patterns that maintain total light output while distributing thermal generation over time.
Solution Approach 2:
The system dynamically adjusts which regions are active at any given moment. By changing the emission pattern and timing of different regions based on thermal conditions and measurement requirements, the system optimizes the balance between total light output and thermal management.
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 approach enhances light output density and measurement accuracy over longer distances while reducing thermal saturation and motion artifacts.
Implementation Method 1
a light emitting unit 4 that has a plurality of regions and is configured to emit light
Implementation Method 2
reflected light of the light emitted from the light emitting unit toward a target object
Implementation Method 3
a drive unit that drives a predetermined region among the plurality of regions of the light emitting unit to perform pulse light emission
Implementation Method 4
a phase signal acquisition unit that receives light that is projected from the light projecting unit and is reflected by a target object, performs photoelectric conversion on the light
Data Source
AI summary
A light emitting apparatus includes: a light emitting unit that has plural regions configured to individually emit light; a drive unit that drives a predetermined region among the plural regions of the light emitting unit to perform pulse light emission; and an acquisition unit that acquires a light reception result obtained by receiving reflected light of the light emitted from the light emitting unit toward a target object, in which in one acquisition acquired by the acquisition unit, the drive unit drives the predetermined region such that the pulse light emission of the predetermined region is performed plural times with time intervals.