Optical Detection Device Signal Processing for Falling Time Reduction
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Solution Overview
Problem
Current photoelectric conversion devices have a longer falling time for output after pulsed light irradiation, which hinders high-speed communication by not allowing the device to keep up with continuous pulses effectively.
Innovation Solution
An optical detection device and signal processing method that combine the outputs from two photoelectric conversion elements, where the first condition is met by differing absolute values of signal change to peak and the second condition by differing signs of signal change, thereby shortening the falling time of the combined output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single photoelectric conversion element is used, then the device structure is simple, but the falling time of the output is long
Solution Approach 1:
The patent divides a single photoelectric conversion element into multiple photoelectric conversion elements (first and second elements). Each element generates an output signal that is processed separately and then combined. This segmentation allows the falling characteristics to be improved by utilizing the different response characteristics of multiple elements, thereby reducing the overall falling time while maintaining reasonable structural complexity.
Solution Approach 2:
The patent combines the output signals from multiple photoelectric conversion elements through signal processing (addition or subtraction). By merging the signals with different phase characteristics, the combined output achieves faster falling time than individual elements. This merging approach resolves the contradiction by integrating multiple elements' advantages while managing the increased device complexity through systematic signal combination.
2Loss of time
If multiple photoelectric conversion elements are used to shorten falling time, then the falling time is reduced, but the device complexity increases
Solution Approach 1:
The patent introduces dynamic signal processing where the outputs from multiple photoelectric conversion elements are combined with different phases (inverted or non-inverted) depending on the desired output characteristic. This dynamic combination strategy allows the system to optimize falling time by selecting appropriate phase relationships, managing device complexity through flexible signal processing rather than fixed structural complexity.
Solution Approach 2:
The patent changes the phase parameter of the output signals from different photoelectric conversion elements. By inverting or maintaining the phase of individual element outputs before combination, the system optimizes the falling time characteristic. This parameter change approach allows falling time reduction while keeping the physical device structure relatively simple, as the complexity is managed through signal processing parameters rather than physical complexity.
3Productivity
If photoelectric conversion elements are used for high-speed communication, then communication capability is enabled, but the falling time is too long to keep up with continuous pulses
Solution Approach 1:
The patent segments the photoelectric conversion function across multiple elements with different response characteristics. This segmentation enables the system to process continuous pulses more effectively by utilizing the complementary falling characteristics of individual elements, thereby improving communication speed and productivity while managing the time loss through intelligent signal combination.
Solution Approach 2:
The patent achieves continuous useful action by combining signals from multiple photoelectric conversion elements in a way that maintains continuous responsiveness to pulse trains. The signal processing ensures that the combined output continuously follows the input pulse train with reduced falling time, enabling high-speed communication where the device can keep up with continuous pulses without significant time loss.
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 combined output from the optical detection device achieves a shorter falling time after pulsed light irradiation, enabling better responsiveness and maintaining output intensity during continuous pulse incidence.
Implementation Method 1
a first photoelectric conversion element configured to output a first output when the first photoelectric conversion element is irradiated with a light pulse; and a second photoelectric conversion element configured to output a second output when the second photoelectric conversion element is irradiated with the light pulse
Data Source
AI summary
This optical detection device includes a first photoelectric conversion element that outputs a first output, and a second photoelectric conversion element that outputs a second output, and is configured to combine a first signal caused by the first output with a second signal caused by the second output, in a state where a first condition and a second condition are satisfied. The first condition is a condition that an absolute value of an amount of change until the first signal reaches a peak is different from an absolute value of an amount of change until the second signal reaches a peak, and the second condition is a condition that a sign of the amount of change until the first signal reaches the peak is different from a sign of the amount of change until the second signal reaches the peak.