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PYTHON480 Scheda tecnica(PDF) 7 Page - ON Semiconductor |
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PYTHON480 Scheda tecnica(HTML) 7 Page - ON Semiconductor |
7 / 69 page PYTHON 480 www.onsemi.com 7 Ray Angle and Microlens Array Information An array of microlenses is placed over the CMOS pixel array in order to improve the absolute responsivity of the photodiodes. The combined microlens array and pixel array has two important properties: 1. Angular dependency of photoresponse of a pixel The photoresponse of a pixel with microlens in the center of the array to a fixed optical power with varied incidence angle is as plotted in Figure 3, where definitions of angles fx and fy are as described by Figure 4. 2. Microlens shift across array and CRA The microlens array is fabricated with a slightly smaller pitch than the array of photodiodes. This difference in pitch creates a varying degree of shift of a pixel’s microlens with regards to its photodiode. A shift in microlens position versus photodiode position will cause a tilted angle of peak photoresponse, here denoted Chief Ray Angle (CRA). Microlenses and photodiodes are aligned with 0 shift and CRA in the center of the array, while the shift and CRA increases radially towards its edges, as illustrated by Figure 5. The purpose of the shifted microlenses is to improve the uniformity of photoresponse when camera lenses with a finite exit pupil distance are used. The CRA varies nearly linearly with distance from the center as illustrated in Figure 6, with a corner CRA of approximately 1.65 degrees. This edge CRA is matching a lens with exit pupil distance of ~ 60 mm. Another CRA option targetting 23.59 degrees is available for both mono and color versions. The corresponding curves for this version is shown in figures 8 and 9. Figure 3. Central Pixel Photoresponse to a Fixed Optical Power with Incidence Angle varied along fx and fy (Low CRA Version) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 −30 −20 −10 0 102030 [degrees deviation from normal] Incidence Angle fx, fy Note that the photoresponse peaks near normal incidence for center pixels. fx = 0 fy = 0 |
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