Color tube with convergence electrode mounting and connecting structure

Claim 1

A plural-beam color picture tube comprising a color screen having arrays of color phosphors, and beam selecting means with apertures corresponding to said arrays, beam generating means for directing a plurality of electron beams toward said color screen for impingement on respective phosphors of each array through the corresponding aperture, lens means for focusing said electron beams on said color screen and having an optical center through which all of said beams are passed with one of said beams passing through said lens means along the optical axis of the latter and two of said beams being angled with respect to said optical axis to emerge from said lens means along paths divergent to said axis, electron beam convergence deflecting means interposed between said lens means and said beam selecting means for deflecting said two beams emerging along said divergent paths so as to achieve convergence of all of said beams at an aperture of said beam selecting means, and magnetic yoke means also interposed between said lens means and said beam selecting means for producing a magnetic field by which said beams are simultaneously deflected to scan said screen; said convergence deflecting means including first plates which are spaced apart for the passage of said one beam therebetween, second plates spaced outwardly from said first plates so that each of said two beams passes between a first plate anD a second plate and means to apply one voltage to said first plates and a different voltage to said second plates so that the voltage difference between said first plates and said second plates produces electrical fields therebetween for effecting said convergence, said convergence deflecting means being disposed closely adjacent to said magnetic yoke means so as to reduce the necessary length of the tube, said first plates being electrically connected to each other only at one end to avoid the provision of a closed conductive loop that includes said first plates and in which a current could be induced to flow by said magnetic field produced by said yoke means, and insulating members traversing said second plates and secured thereto at locations spaced therealong, conductive pins extending between said insulating members on one of said second plates and the correspondingly located insulating members on the other one of said second plates, each of said conductive pins being rigidly and electrically connected with only a respective one of said first plates.