Cathode-ray tube having a substantially flat face panel

Details Cathode-ray tube having a substantially flat face panel Cathode-ray tube having a substantially flat face panel

1995-03-02

1996-02-27

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313461, 220 21A, H01J 3100, H01J 2986

Patent

active

054951402

ABSTRACT:
The present invention relates to a cathode-ray tube having: (1) a face panel; (2) a phosphor screen; (3) a funnel coupled to the face panel; and (4) an electron beam emitter. The outer surface of the face panel is defined by using orthogonal coordinates. An origin of the orthogonal coordinates is defined as a center of the outer surface of the face panel. An X-axis of the orthogonal coordinates is defined as a horizontal axis. A Y-axis of the orthogonal coordinates is defined as a vertical axis. A Z-axis of the orthogonal coordinates is defined as the central axis of the funnel. The Z coordinate for points on the outer surface of the face panel are defined by the polynomial: ##EQU1## wherein i and j are integers .gtoreq.0, n=2, and aij are predetermined coefficients of the polynomial. The predetermined coefficients along the X-axis are represented by a.sub.10 and a.sub.20, and coefficients along the Y-axis are represented by a.sub.01 and a.sub.02. The coefficients a.sub.10, a.sub.20, a.sub.01, and a.sub.02 satisfy the relationships: (1) a.sub.20 /a.sub.10 <0.1.times.10.sup.-6 ; and (2) a.sub.02 /a.sub.01 <0.1.times.10.sup.-6. The remaining coefficients are selected so that an external light image is not distorted when reflected from the outer surface of the face panel.

REFERENCES:
patent: 4535907 (1985-08-01), Tokita et al.
patent: 4537321 (1985-08-01), Tokita
patent: 4537322 (1985-08-01), Okada et al.
patent: 4570101 (1986-02-01), Campbell
patent: 4580077 (1986-04-01), Bakker et al.
patent: 4786840 (1988-11-01), Ragland, Jr.
patent: 5107999 (1992-04-01), Canevazzi
patent: 5155410 (1992-12-01), Wakasono et al.

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