Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1992-09-15
1995-01-17
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313449, 313460, H01J 2950
Patent
active
053828720
ABSTRACT:
An electron gun for a color cathode ray tube includes a last accelerating electrode having a large-caliber electron beam passing hole for commonly passing red, blue, and green electron beams. Both ends of the beam passing hole include circular arc portions formed with a predetermined curvature. The center portions where the green electron beam passes through protrude by a predetermined width. The length of the protrusion in the horizontal direction satisfies the following inequality: L<H-2R(1+cos .alpha.), where H designates the horizontal width of the large-caliber electron beam passing hole, R is the radius of the circular arc portions and .alpha. is the angle between a line drawn from either center of the circular arc portions to an adjacent apex of the protrusions and a line connecting centers of both circular arc portions. By using the above-described device, the halo of an electron beam landing on a phosphor layer can be decreased, thereby enhancing the resolution of a cathode ray tube adopting the electron gun.
REFERENCES:
patent: 4370592 (1983-01-01), Hughes et al.
patent: 4388552 (1983-06-01), Greninger
patent: 4764704 (1988-08-01), New et al.
patent: 5013963 (1991-05-01), Ikegami et al.
patent: 5262702 (1993-11-01), Shimoma et al.
Hwang Jae-Yul
Kim Jong-kwan
Kim Kyung-Nam
Lee Seong-Woo
Patel Ashok
Samsung Electron Devices Co. Ltd.
Yusko Donald J.
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