Electron gun and method for manufacturing the same

Details Electron gun and method for manufacturing the same Electron gun and method for manufacturing the same

1989-12-18

1991-04-16

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313457, 313482, 445 34, 65 591, 65 597, H01J 2948

Patent

active

050085891

ABSTRACT:
The present invention relates to an electron gun retaining a cathode and a plurality of electrodes with a pair of bead glasses and a method for manufacturing the same, wherein each of the bead glasses are provided with a convex portion at a position where a bead support for an electrode is buried on a side of the electrodes, each of bead bases of a beading apparatus on which the bead glasses are disposed is formed with a concave portion at a position corresponding to the convex portion of the bead glass, the bead glasses disposed on the bead bases are heated and softened, the bead supports for the cathode and the plurality of electrodes are buried and secured in the bead glasses, and the bead glasses each include convex portions on a side opposite to the electrodes. In accordance with the present invention, recesses and projections over the surfaces of the bead glasses on the electrode sides are reduced in size, thereby further increasing a supporting strength of the electrodes, preventing withstand voltage deterioration of the electron gun, and maximizing a yield in a manufacturing process of the electron gun.

REFERENCES:
patent: 3069400 (1971-09-01), Marks et al.
patent: 4063340 (1977-12-01), Blumenberg et al.
patent: 4855639 (1989-08-01), Van Eck

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