Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1986-09-16
1991-05-07
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313409, 313412, 313460, H01J 2951
Patent
active
050139630
ABSTRACT:
The in-line type electron gun of this invention is formed so that a depression, which is formed at the lower voltage electrode face opposing to the higher electrode of the two electrodes for forming a common main focusing lens in the opposing gap thereof and has three lens holes for individual electron beams arrayed in-line at the bottom thereof, is formed so that the width in the direction perpendicular to the lens hole array direction is smaller at the central part in the lens hole array direction as compared with the other parts. Also the center lens hole of the three lens holes at the bottom of the depression is smaller in diameter than the other two. Accordingly, the focus voltages of the three beams passing through the three lens holes and the shapes of beam spots are made more uniform as compared with the prior art.
REFERENCES:
patent: 4234814 (1980-11-01), Chen et al.
patent: 4370592 (1983-01-01), Hughes et al.
patent: 4388552 (1983-06-01), Greninger
patent: 4400649 (1983-08-01), Chen
patent: 4558253 (1985-12-01), Bechis et al.
patent: 4583024 (1986-04-01), Chen
patent: 4590402 (1986-05-01), Alig
patent: 4620133 (1986-10-01), Morrell et al.
An Overview of the COTY-29 Tube System: An Improved Generation of Color Picture Tubes, IEEE Transaction on Consumer Elec., CE-28, 290-296 (Aug. 1982).
Ikegami Kazunori
Nosaka Eishou
Okuda Souitirou
Yoshida Tadahisa
Horabik Michael
Mitsubishi Denki & Kabushiki Kaisha
Yusko Donald J.
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