Electron gun assembly for cathode ray tube

Details Electron gun assembly for cathode ray tube Electron gun assembly for cathode ray tube

2005-06-07

2005-06-07

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

C313S446000, C313S449000

Reexamination Certificate

active

06903501

ABSTRACT:
An electron gun for a monochrome cathode ray tube to be used in a projection display device includes a cathode for emitting thermal electrons, and first and second electrodes forming a triode portion together with the cathode. A third electrode is adjacent the second electrode. A fourth electrode is adjacent the third electrode to receive a focus voltage. A fifth electrode partially surrounds the fourth electrode while being adjacent the fourth electrode to receive an anode voltage together with the third electrode. The second electrode has a bottom portion with a stepped portion surrounding a hole for guiding the electron beams while being protruded toward the first electrode, and a sidewall portion extended from the periphery of the bottom portion toward the third electrode. The first and the second electrodes are structured to satisfy the following condition: 0.54≦T/G≦1.50 wherein T(mm) indicates the thickness of the bottom portion of the second electrode, and G(mm) indicates the distance between the first and the second electrodes.

REFERENCES:
patent: 4271374 (1981-06-01), Kimura
patent: 4703223 (1987-10-01), Iguchi et al.
patent: 5488264 (1996-01-01), Ota et al.
patent: 6262524 (2001-07-01), Ouchi

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