Television camera tube with diode electron gun
AssigneeU.S. Philips Corporation
InventorErich E. Himmelbauer
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Abstract
A television camera tube having a diode electron gun comprising a cathode and an anode having a central aperture. The part of the anode surrounding the central aperture is situated closer to the cathode than the remainder of the anode and has an area which is smaller than 75% of the cathode's emissive surface. This configuration minimizes anode current and avoids wasted power while retaining desirable electron beam characteristics.
Claims9
A television camera tube comprising a photosensitive target for producing electrical signals corresponding to an optical image formed thereon, a diode electron gun for producing an electron beam, and means for focussing the electron beam on the target, said diode electron gun including, arranged successively along an axis of the tube, a cathode having an emissive surface extending substantially perpendicularly to the axis and an anode having a central aperture around the axis, a part of the anode surrounding the central aperture being situated closer to the cathode than the remainder of the anode, said part of the anode having an area which is smaller than 75% of the emissive surface of the cathode.
Dependencies are inferred from the claim text.