The optical zebra strip is likely settung the individual pixels and may work as mico-lenses. One kind of needs an optic to focus the light - otherwise the picture would spread out too much with the distance. The fax standard has a standard resolution of some 200 dpi for the fine mode. So one could check the distances.
The sensor part looks like it is made of several separate chips and the strage extra dots may be just there for alignment during the placement of the chips.
It looks like the sensor is not an old style CCD, but likely more a CMOS based sensor. A CCD would be simpler, with less parts directly linked to the sensors. This looks a bit like some amplifier per pixel.