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PYTHON480 データシート(PDF) 7 Page - ON Semiconductor

部品番号 PYTHON480
部品情報  Megapixel Global Shutter CMOS Image Sensor
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メーカー  ONSEMI [ON Semiconductor]
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PYTHON 480
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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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