Multi-Unit Light-Emitting Chip Timing for Low-Noise Image Exposure

The patent divides the large number of light emitting units into multiple groups (first group and second group), and controls them to operate at different timings. This segmentation allows the exposure function to be maintained while reducing the number of simultaneously activated units, thereby decreasing electrical noise and switching noise.

The patent implements periodic action by alternately activating different groups of light emitting units in a sequential manner. The first group is activated at a first timing, and the second group is activated at a second timing, creating a periodic operation pattern that reduces peak electrical noise while maintaining overall exposure efficiency.

By segmenting light emitting units into multiple groups with separate control, the patent maintains exposure completeness through coordinated operation of all groups while reducing switching noise by preventing simultaneous activation of all units.

The patent employs preliminary action by preparing and controlling different groups of light emitting units to activate at different timings. This ensures that exposure coverage is maintained through sequential activation, while the staggered timing prevents noise peaks associated with simultaneous switching.