Cathode support structure for color picture tube guns to equalize cutoff relation during warm-up
Electron gun assembly for a color picture tube Patent #: 4232246
ApplicationNo. 06/214693 filed on 02/09/1980
US Classes:313/460, Plural313/409Plural beam generating or control
ExaminersPrimary: Moore, David K.
Attorney, Agent or Firm
International ClassesH01J 29/50 (20060101)
H01J 29/58 (20060101)
H01J 29/62 (20060101)
Foreign Application Priority Data1980-01-18 JP
AbstractAn electrode structure for an electron gun, especially an in-line type electrode structure for an electron gun of a color picture tube. The electrode structure dispenses with auxiliary electrodes and its three cylindrical members are integrally formed by press work. After the pressing step, the inner edge of the bottom portion of each cylindrical members is beveled to provide a tapering surface having a desired circular cross section. By forming a circular groove in the bottom portion, opposite to the tapering surface, the formation of the tapering surface is made more exact.