Light Source Driving Apparatus for Pulse Modulation Sampling
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Solution Overview
Problem
Existing light source driving systems face challenges in sampling light amounts at appropriate timings without increasing processor loads, particularly when white light and excitation light sources are alternately driven or pulse-driven.
Innovation Solution
A light source driving apparatus with a reception unit, output unit, sample unit, and timing output unit that receives and delays pulse modulation signals to sample light amounts at predetermined timings, allowing for efficient sampling without increasing processor loads, and includes a judgment unit to handle stationary signals for continuous light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pulse modulation signals are used to alternately drive white light and excitation light sources, then observation modes can be switched, but sampling timing becomes complex and processor load increases
Solution Approach 1:
The control system is segmented into dedicated functional units: a timing generation unit that creates sampling timing signals based on pulse modulation signal characteristics, and a sampling control unit that uses these timing signals to control the photodiode and ADC. This segmentation eliminates the need for complex processor-based timing control while enabling versatile observation mode switching.
Solution Approach 2:
A dedicated timing generation unit acts as an intermediary between the pulse modulation signal input and the sampling control. This intermediary unit automatically generates appropriate sampling timing signals by detecting the characteristics of the pulse modulation signals, thereby simplifying the overall control architecture and reducing processor load.
2Power
If pulse-driven light sources are used for alternately illuminating, then light output control is improved, but sampling timing coordination becomes difficult
Solution Approach 1:
The timing generation unit continuously monitors the pulse modulation signals driving the light sources and automatically generates sampling timing signals based on the detected pulse characteristics. This feedback mechanism ensures that sampling always occurs at the correct timing relative to the light source pulses, maintaining coordination without complex preprocessing.
Solution Approach 2:
The timing generation unit prepares sampling timing signals in advance by detecting pulse modulation signal characteristics before the actual sampling occurs. This preliminary action ensures that sampling is always synchronized with the light source output without requiring real-time processor intervention during the critical sampling moment.
3Ease of operation
If external apparatus controls light source synchronization, then operational coordination is improved, but sampling timing control becomes more complex
Solution Approach 1:
The timing generation unit performs self-service by automatically generating sampling timing signals based on the characteristics of incoming pulse modulation signals from external apparatus. This self-service capability allows the system to maintain operational coordination with external devices while keeping sampling timing control simple and autonomous.
Data Source
AI summary
A light source driving apparatus according to an embodiment of the present technology includes a reception unit, an output unit, a sample unit, and a timing output unit. The reception unit receives a pulse modulation signal for pulse-driving a light source. The output unit outputs a delay modulation signal obtained by delaying the received pulse modulation signal to the light source. The sample unit samples, at a predetermined timing, a light amount of the light source driven on the basis of the delay modulation signal. The timing output unit outputs, to the sample unit, a pulse fall timing of the received pulse modulation signal as the predetermined timing.