EP 0244826 A3 19890412 - MULTIPLE BEAM ELECTRON DISCHARGE TUBE HAVING BEAM CONVERGENCE AND BEAM-TO-BEAM COMPRESSION COMPENSATION
Title (en)
MULTIPLE BEAM ELECTRON DISCHARGE TUBE HAVING BEAM CONVERGENCE AND BEAM-TO-BEAM COMPRESSION COMPENSATION
Publication
Application
Priority
US 85957286 A 19860505
Abstract (en)
[origin: EP0244826A2] The invention concerns a multiple beam electron discharge tube (16) comprising beam-producing means (24) for producing plural beams of electrons directed along a beam axis (26) in the tube (16) toward a display screen (28, 30) positioned at one end of the tube (16); deflection means (32) for deflecting the electron beams relative to the beam axis (26) to produce an image on the display screen; convergence means positioned between the beam-producing means (24) and the deflection means (32) for converging the electron beams, the convergence means including a first electrode structure (10) that is electrically isolated from and positioned upstream of a second electrode structure (36) that has a limiting aperture through which the electron beams propagate; and first biasing means for providing between the first and second electrode structures a first potential difference of an amount that directs through the limiting aperture a substantial number of the electrons in each one of the beams.
IPC 1-7
IPC 8 full level
H01J 29/46 (2006.01); H01J 29/50 (2006.01); H01J 29/51 (2006.01); H01J 29/52 (2006.01)
CPC (source: EP)
H01J 29/46 (2013.01); H01J 29/50 (2013.01); H01J 29/51 (2013.01); H01J 2229/4827 (2013.01); H01J 2229/507 (2013.01)
Citation (search report)
[X] US 3798478 A 19740319 - SAY D
Designated contracting state (EPC)
DE FR NL
DOCDB simple family (publication)
EP 0244826 A2 19871111; EP 0244826 A3 19890412; JP S62268045 A 19871120
DOCDB simple family (application)
EP 87106502 A 19870505; JP 10616387 A 19870429