Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1986-12-08
1988-05-31
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313411, 313412, 313417, 313409, B65B 2102
Patent
active
047483725
ABSTRACT:
Coma correction means is provided in a color display tube including an evacuated envelope (1) containing an electron gun system (5) of the "in-line" type to generate three electron beams (6, 7, 8) situated with their axes in one plane. The electron beams converge on a display screen (10) provided on a wall of the envelope and are deflected over the display screen in two mutually perpendicular directions by means of a first and a second deflection field. The first deflection field is parallel to the plane. The electron gun system includes at its end field shapers (34, 35) for causing the frames described on the display screen by the electron beams to substantially coincide the field shapers include substantially annular elements (34) of a material having a high magnetic permeability around the two outermost beams. Two elongate flat strips (35) of a material having a high magnetic permeability are provided symmetrically with respect to the axis (37) of the central beam and the plane through the beam axes. Each strip has a longitudinal axis (L) substantially perpendicular to the plane, intersecets the plane extends with its a width axis (B) in the direction of the display screen (10), and has a recess (38) adjacent the central beam aperture (32).
REFERENCES:
patent: 3866080 (1975-02-01), Barkow
patent: 4142131 (1979-02-01), Ando et al.
patent: 4196370 (1980-04-01), Hughes
patent: 4208610 (1980-06-01), Schwartz
patent: 4625145 (1986-11-01), Gerritsen et al.
patent: 4634923 (1987-01-01), Alig
Kraus Robert J.
Moore David K.
Razavi Michael
U.S. Philips Corporation
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