Abstract: A solid state image pickup device utilizing a charge coupled device (CCD) includes an imaging section for converting a projected optical image into an electric charge corresponding to a quantity of light, a storage section for storing the electric charge transferred from the imaging section, a readout section for delivering as a video output signal the electric charge sequentially transferred from the storage section, a drive means for transferring the electric charge, and an erasing section for erasing an unrequired portion of the electric charge. The erasing section is an erasing drain formed by diffusion on a P-type semiconductor substrate of CCD and includes an erasing electrode connected to the erasing drain.

Abstract: A spatial filter covered with first protective layers and a second protective layer, wherein the second protective layer is mounted on the first protective layers so as to fill up recesses appearing in the surface of said first protective layers which are evaporated on filter stripes deposited on the surface of a substrate and on those parts of the surface of said substrate on which filter stripes are not formed and, when the spatial filter is placed in an image pickup tube, the second protective layer having a smooth flawless surface enables the image pickup tube to produce a good output image for a long period.