Optical Scanning Device Mirror Timing Correction

The patent introduces a photodetector as an intermediary component that detects the actual position of the mirror portion by sensing reflected light. This intermediary measurement system provides more accurate timing information for when the mirror angle equals the reference angle, resolving the contradiction between simple structure and high measurement precision by adding a specialized sensing element only where needed for critical timing detection.

The patent implements a feedback mechanism where the photodetector's detection results are used to generate correction signals that adjust the timing of reference signals. This feedback loop continuously improves the accuracy of timing detection by comparing actual mirror position with expected position and correcting any deviations, thereby maintaining high sensing accuracy without requiring complex structural changes.

The patent applies local quality by placing the photodetector at a specific location where it can optimally detect the reflected light from the mirror portion when the mirror is at the reference angle. Rather than making the entire device complex, the solution concentrates the enhanced sensing capability locally at the critical detection point, improving measurement precision without uniformly increasing overall device complexity.

The photodetector serves multiple functions: it detects the timing when the mirror angle equals the reference angle, provides feedback for timing correction, and enables accurate synchronization of light source irradiation. By making this single component multi-functional, the patent achieves high sensing accuracy without adding numerous separate components, thereby limiting the increase in device complexity.