Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1996-03-01
1998-12-08
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313414, 313447, 313453, 313458, 313460, H01J 2950, H01J 2946
Patent
active
058475001
ABSTRACT:
In an electron gun for a cathode ray tube in which a focus electrode group includes a single platelike electrode having three apertures arrayed in one plane and a thickness equal to a depth of each of the three apertures, a tapered surface is formed on the entrance side and/or exit side of each of the three apertures, the tapered surface having a diameter larger than the aperture diameter and having a linear or curved shape in cross section, and a step which extends in the direction of the depth is formed around an aperture periphery of the tapered surface. With this constitution, the concentricity between each of the tapered surfaces and a respective one of the apertures can be measured with high precision on the basis of the boundary between each of the tapered surfaces and the corresponding one of the steps, thereby improving the precision of measurement of the concentricity between each of the apertures formed in the platelike electrode and the tapered surface formed around the aperture periphery.
REFERENCES:
patent: 4388552 (1983-06-01), Greninger
patent: 4388553 (1983-06-01), Chen
patent: 4510413 (1985-04-01), Yabe et al.
patent: 4656391 (1987-04-01), Say
patent: 4712043 (1987-12-01), Takenaka et al.
patent: 4891549 (1990-01-01), Kniesser et al.
patent: 4942334 (1990-07-01), Kimmel et al.
Mera Takeshi
Miura Masato
Takahashi Yoshiaki
Haynes Mack
Hitachi , Ltd.
Hitachi Electronic Devices Co. Ltd.
O'Shea Sandra L.
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