Contact Image Sensor Timing for Stable Output at Variable Scan Speeds

The patent applies periodic action by using interlaced scanning with alternating odd and even line periods. Odd lines use a first line period while even lines use a second line period, creating a periodic pattern that allows the system to capture sufficient light while controlling dark current through the alternating structure. This resolves the contradiction by distributing the extended scanning time across alternating lines rather than uniformly extending all line periods.

The patent changes the line period parameter dynamically based on line type (odd or even). By setting different line periods for odd and even lines, the system optimizes light capture for slower speeds while preventing dark current saturation. The parameter change is implemented through the control circuit that generates different scanning control signals for odd and even lines based on their respective line periods.

The patent implements periodic action through interlaced scanning where odd and even lines follow regular periodic patterns with predetermined line periods. This periodic structure ensures that while the system adapts to different object speeds by adjusting the alternating line periods, the output signals remain consistent and calibratable because they follow a predictable periodic pattern rather than random variations.

The patent applies preliminary action by pre-setting the first and second line periods for odd and even lines respectively before scanning begins. The control circuit is configured in advance with these different line periods, allowing the system to adapt to various object speeds while maintaining consistent, predictable output signals that can be calibrated. The preliminary configuration of alternating line periods eliminates random output variations.

The patent uses periodic action through interlaced scanning with alternating odd and even lines that have different line periods. This periodic alternation allows the system to extend the line period for slow object movement to capture more optical signal while preventing dark voltage saturation by distributing the extended time across alternating lines. The periodic pattern ensures that no single line accumulates excessive dark current.

The patent applies segmentation by dividing the scanning process into separate odd and even line groups with different line periods. This segmentation allows independent optimization of light capture for each group while controlling dark voltage accumulation. By segmenting the scanning lines and assigning different line periods to odd and even lines, the system captures sufficient optical signal without allowing dark voltage to reach saturation levels in any single line.