H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.2
H01J 29/48 (2006.01) H01J 31/26 (2006.01) H01J 31/38 (2006.01)
Patent
CA 1173485
PHN 9526C 14 ABSTRACT: By manufacturing, in a device having a televi- sion camera tube comprising in an evacuated envelope a diode electron gun to generate an electron beam, compris- ing, centred along an axis, successively a cathode having an emissive surface extending substantially perpendicu- larly to the axis, an anode having a central aperture around the axis, the part of the anode having the central aperture being situated closer to the cathode than the remainder of the anode and a focusing lens to focus the electron beam on a photosensitive target on which a potential distribution is formed by projecting an optical image on it, which target, by scanning with an electron beam, provides electrical signals corresponding to the said optical image, the said part of the anode comprising the central aperture in such manner that said part has an area which is smaller than 75% of the emissive surface, a device is obtained having a diode electron gun in which the overall anode current is smaller than in the devices usual so far.
355354
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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