Electron gun having a multiple lens between a beam- forming...

Details Electron gun having a multiple lens between a beam- forming... Electron gun having a multiple lens between a beam- forming...

H - Electricity

01

J

313/35.14, 313/3

H01J 29/50 (2006.01) H04N 3/22 (2006.01)

Patent

CA 1266082

RCA 82,309 Abstract A color display system includes a cathode-ray tube and yoke. The yoke is a self-converging type that produces an astigmatic magnetic deflection field within the tube. The cathode-ray tube has an electron gun for generating and directing three electron beams along paths toward a screen of the tube. The electron gun includes electrodes that comprise a beam-forming region and electrodes that form a main focusing lens, and features electrodes for forming a multipole lens between the beam-forming region and the main focusing lens in each of the electron beam paths. Each multipole lens is oriented to provide a correction to an associated electron beam to at least partially compensate for the effect of the astigmatic magnetic field on the associated beam. There are two multipole lens electrodes. A second of the two multipole lens electrodes is connected to and combined with a main focusing lens electrode, and a first of the two multipole lens electrodes is located between the second multipole lens electrode and the beam-forming region and faces the second multipole lens electrode. (Figures 1 and 2)

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