Patent ID: 9748067
Date: 2017-08-29
CPC Classifications: H01J,H05G

Claim:
1. A positioning apparatus for an electron beam of an electron tube, the positioning apparatus comprising: a first DC voltage circuit comprising a high potential difference, a first potential level, and a second potential level; a second DC voltage circuit comprising a smaller potential difference, a first potential level, and a second potential level, wherein a ratio of a voltage drop across the second DC voltage circuit contributes to a voltage drop across the first DC voltage circuit by up to 1:4; and a deflection module comprising two inputs and at least one deflection coil, the at least one deflection coil connected between the two inputs, wherein the first potential level of the first DC voltage circuit is connected switchably to one of the two inputs of the deflection module to provide a first switching path, and the second potential level of the first DC voltage circuit is connected to a second of the two inputs of the deflection module, and wherein the first potential level of the second DC voltage circuit is connected switchably to one of the two inputs of the deflection module to provide a second switching path, which is switchable separately from the first switching path, and the second potential level of the second DC voltage circuit is connected to a second of the two inputs of the deflection module.