Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1997-08-22
1998-12-08
Patel, Ashok
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313412, 313460, H01J 2951
Patent
active
058475028
ABSTRACT:
A color cathode ray tube has an evacuated envelope including a panel portion having a phosphor screen and a neck portion, and an in-line electron gun including a main lens and an electrostatic quadrupole lens and housed in the neck portion. The focus electrode of the main lens has a single opening at its one end for the three electron beams. The single opening has a diameter larger than a horizontal direction than that in a vertical direction. A distance from the main lens to the phosphor screen is not larger than 300 mm, an outer diameter T of the neck portion satisfies the following inequality: 23.2 mm.ltoreq.T.ltoreq.25.9 mm, and a value D of twice a distance from the side electron beams to a vertical edge of the single opening satisfies the following inequality: 50 mm.ltoreq.D.ltoreq.6.5 mm.
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Oshita Kazuhisa
Shirai Shoji
Uchida Go
Hitachi , Ltd.
Patel Ashok
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