Cathode ray tube having an envelope shaped to reduce beam deflec

Details Cathode ray tube having an envelope shaped to reduce beam deflec Cathode ray tube having an envelope shaped to reduce beam deflec

1997-05-28

1999-12-14

Patel, Vip

Electric lamp and discharge devices

Cathode ray tube

Envelope

H01J 3100

Patent

active

060022035

ABSTRACT:
A cathode ray tube includes a vacuum envelope having a substantially rectangular panel, a cylindrical neck, and a funnel connecting the panel and the neck. A phosphor screen arranged on the inner surface of the panel generates luminescence upon impingement of electron beams, which are generated by an electron gun assembly disposed in the neck. In order to create a image visible through the panel, a deflection yoke is mounted on the outer surface of the funnel to generate a magnetic field in the funnel, deflect the electron beams, and thereby scan the phosphor screen. According to the present invention, the portion of the funnel over which the deflection yoke is mounted is formed such that the power required to generate a deflection field capable of scanning substantially the entire phosphor screen may be reduced. To this end, the funnel is formed over a predetermined range along a first axis coincident with the axis of symmetry of the cylindrical neck such that at least one cross section of the inner and outer funnel perpendicular to the first axis has a non-circular shape and a maximum diameter along a direction other than those of the major and minor axes of the substantially rectangular panel. Moreover, within this predetermined range, the point on the funnel's cross section that is furthest from the first axis is not located along the direction of the panel's diagonal axis.

REFERENCES:
patent: 3087085 (1963-04-01), Truner
patent: 3146368 (1964-08-01), Fiore et al.
patent: 3591035 (1971-07-01), Gossie
patent: 3720345 (1973-03-01), Logue
patent: 3731129 (1973-05-01), Tsuneta et al.
patent: 4065695 (1977-12-01), Van Der Waal
patent: 4990824 (1991-02-01), Vriens et al.
patent: 5258688 (1993-11-01), Fondrk

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