Imaging Device Focus Control Using Split Light Signal Coincidence

The patent divides the imaging element into multiple regions (first region and second region) with different functional characteristics. The first region is optimized for receiving light from specific directions, while the second region handles light from other directions. This local differentiation allows each region to maintain consistent signal response characteristics, thereby preserving focus detection accuracy even when light enters at various angles.

The imaging element is segmented into multiple regions that correspond to different pupil regions. By separating the imaging element in this way, the patent enables independent optimization of each region's response characteristics, preventing signal amount discrepancies that would otherwise occur across different imaging elements when subjected to angled light.

Each region of the imaging element is designed with specific local characteristics that match the light paths from corresponding pupil regions. This ensures that light from a given direction consistently lands on the appropriate region, preventing ghosting and misalignment. The local quality optimization maintains reliable detection across different lighting conditions.

The patent converts the potential harm of angled light causing ghosting into a beneficial feature by designing regions that specifically handle angled light paths. The misalignment that would normally cause ghosting is instead used to direct light to specific regions optimized for that purpose, transforming the harmful effect into an accurate detection mechanism.