Light Scanning Device Synchronizing Signal Circuit
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Solution Overview
Problem
Conventional laser scanning devices experience timing deviations due to fluctuations in the light receiving current and DC level shifts, leading to synchronization issues, which existing methods struggle to address effectively, especially when caused by temperature and time-dependent factors.
Innovation Solution
A synchronizing signal generating circuit that divides the light receiving signal into two signals, applies different bias signals, and uses a waveform shaping system, including a low-pass filter, to compare and output a synchronized signal, thereby reducing timing deviations caused by power supply voltage and temperature changes, as well as light receiving signal level fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional comparator-based SOS signal generating circuit is used, then the circuit structure is simple, but timing deviation occurs due to fluctuations in light receiving current and DC level shifts
Solution Approach 1:
The patent divides the light receiving signal into two separate signals: a first light receiving signal that passes through a first bias superimposing circuit, and a second light receiving signal that passes through a second bias superimposing circuit. This segmentation allows each signal to be processed with different bias conditions, enabling the system to compensate for DC level shifts and maintain accurate timing synchronization despite fluctuations in the original light receiving signal.
2Measurement precision
If the reference voltage is adjusted to compensate for timing deviation, then timing accuracy improves, but the system complexity increases due to additional control mechanisms
Solution Approach 1:
The patent employs bias superimposing circuits that automatically adjust the DC levels of the two light receiving signals based on the input signal characteristics. The first bias superimposing circuit adds a first bias voltage to the first light receiving signal, while the second bias superimposing circuit adds a second bias voltage to the second light receiving signal. This self-adjusting mechanism compensates for DC level shifts and timing deviations without requiring external control, maintaining timing accuracy while avoiding additional control complexity.
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 solution effectively reduces or eliminates timing deviations, ensuring synchronized scanning even with fluctuations in the light receiving signal and DC level shifts, maintaining precise synchronization timing.
Implementation Method 1
a PD 5 receives the scanned LB and outputs the photoelectrically-converted light receiving signal
Data Source
AI summary
A light scanning device capable of scanning a light beam on a photosensitive surface includes a light receiving system configured to receive the light beam and output a light receiving signal and a synchronizing signal generating system configured to generate a synchronizing signal with which light scanning is synchronized. The synchronizing signal generating system includes a first bias superimposing system configured to superimpose a first bias signal onto the light receiving signals to generate a first light receiving signal, a second bias superimposing system configured to superimpose a second bias signal with a different level from that of the first bias signal onto the light receiving signals to generate a second light receiving signal, a waveform shaping system configured to shape the waveform of the second light receiving signal, and a comparing system configured to compare the first light receiving signal with the second light receiving signal to output the synchronizing signal.