In a color television display tube the electron gun system constructed from three electron guns comprises a first group of corresponding electrodes and a second group of corresponding electrodes to be operated at a higher electrical potential than the first group. The electrodes in each group are positioned relative to each other by means of metal braces connected thereto. The ends of the braces are secured to insulating support rods. At least one group of corresponding electrodes is interconnected by means of one or more conductive contact springs surrounding the support rods and touching the surface of each electrode or of the brace connected thereto.
An electron gun (1) for use in a cathode ray tube has brackets (20) connecting grids (2, 3, 4, 5, 6) to insulator rods (10). Electric conductors (11) extending to contact pins (12) embedded in a glass flange (13) are welded to a base (21) of the brackets (20). Legs (25) extend from the base (21) and are welded to the grids (2, 3, 4, 5, 6). Lugs (26) extend from the base (21) in opposite directions and are embedded in the glass rods (10). The brackets (20) provides stability to the grids (2, 3, 4, 5, 6), thereby preventing varying properties of guns (1) from one batch. The cathode ray tube is provided with the gun (1).
4618800 - Precision electrode alignment - Owned by Rank Electronic Tubes, Inc. (Scotts Valley, CA) [*] Notice:The portion of the term of this patent subsequent to February 21, 2003 has been disclaimed.
The electrodes in a tube, such as a cathode ray tube, are held in accurate alignment, particularly under conditions of high stress, by employing a series of glass rods along the electrodes with a plurality of U-shaped straps extending over the rods and forming a tight fit between the rods and the neck of the tube with the legs of the U being bowed outwardly under tension.
