Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1989-09-12
1991-05-14
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313460, 313409, 315 16, H01J 2950, H01J 2956, H01J 2958
Patent
active
050159100
ABSTRACT:
A novel electron gun for the color picture tube is disclosed, which comprises at least a cathode for emitting three electron beams in alignment and focusing electrodes for focusing the electron beams emitted from the cathode. The forcusing electrodes include first and second focusing electrodes for passing electron beams. The first focusing electrode includes a plurality of perpendicular plate electrodes arranged in such a manner as to sandwich the electron beams along the direction of arrangement thereof after being passed through the passage apertures and rim electrodes surrounding the perpendicular plate electrodes. The second focusing electrode includes a couple of horizontal plate electrodes arranged in such a manner as to hold the electron beams along the direction perpendicular to the direction of arrangement thereof after being passed through passage apertures and extending in opposed relationship with the perpendicular plate electrodes and rim electrodes along tht electron gun axis. The resolution of the peripheral parts of the display surface of the picture tube is thus improved and the assembly of the electron gun thereof is facilitated.
REFERENCES:
patent: 4086513 (1978-04-01), Evans, Jr.
patent: 4772827 (1988-09-01), Osakabe
Furuyama Masayoshi
Ishii Sakae
Shirai Shoji
Takahashi Yoshiaki
DeMeo Palmer C.
Giust John
Hitachi , Ltd.
Hitachi Device Engineering & Co., Ltd.
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