RCA's Rose, Law and Weimer managed in 1945 to produce the first usable Image Orthicon. The biggest difficulty was to make the grid with 1600 holes per square mm, this was important for the image resolution of the tube. Also the glass target plate with a thickness of 0,005 mm was not easy to fabricate in those days. The normal working temperature of the tube was about 30 degrees Celsius and was stabilised with a heater and fan.
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