Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1997-04-16
1998-06-16
Patel, Nimeshkumar
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
313446, 313451, 313456, 313270, 443 29, 443 34, H01J 2948
Patent
active
057676151
ABSTRACT:
A deformation produced by heat when a G1 grid is welded can be suppressed. A U-shaped slit (34) is formed on an outer peripheral wall (31) of a G1 grid (12). A spot-welding portion (X) is set to an end edge of a joint portion of the U-shaped slit (34) and this spot-welding portion (X) is spot-welded to a retainer (22) of a cathode (21) by a laser beam. In the G1 grid (12), the deformation produced by heat upon welding is absorbed by the surrounding portions of the slit (34). Therefore, it becomes possible to prevent the opposing surface opposing a G2 grid (13) from being expanded by heat. Thus, the spacing between the electrodes can be maintained to be a proper one and the angles of the electron beam emitting apertures can be maintained at proper ones. Therefore, it becomes possible to prevent the characteristic of the electron gun and the resolution of the cathode ray tube from being deteriorated.
REFERENCES:
patent: 3354340 (1967-11-01), Almer et al.
patent: 3716739 (1973-02-01), Say
Patent Abstracts of Japan, Miyamoto Satoru et al. "Structure Body of Electron Gun for Camera Tube of Electrostatic Focusing Type," vol. 9, No. 39(E297) 19 Feb.1985, JP-A-59 180 937 Hitachi Seisakusho KK. Oct. 15, 1984 .
Patel Nimeshkumar
Sony Corporation
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