Type 1846 Iconoscope TV Camera Tube
Pricing & History
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This is an iconoscope tube developed by Vladimir Zworykin in the later 1920s and early 1930s. It uses a target of thin mica with tiny photosensitive particles on the front and a conducting layer on the back. The target is scanned by an electron beam from an electron gun similar to those used in oscilloscope and TV picture tubes. As it passes, the electron beam charges the particles with electrons which are then emitted in proportion to the amount of light falling on them. On the next scan the particles are recharged, the voltage change in them registering as a pulse capacitively coupled to the backing and they also emit secondary electrons which are picked up by the positively charged collector rings, the dark bands visible on the iconoscope body. The particles with more charge dissipated by the light emit fewer electrons. These charge changes can be detected and amplified into a TV signal. Because the target must be scanned from the same side that the light strikes, the electron gun is offset from the center to avoid blocking the light. That means that the distance to the target varies across it, requiring that the scan pattern and focus be distorted to match. A Google search on "iconoscope" will bring up much more information. When Zworykin heard about Kamikaze attacks, he proposed using the same idea with remote control that avoided
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