Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1978-09-08
1980-03-25
Segal, Robert
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
H01J 2907
Patent
active
041952480
ABSTRACT:
An improvement is provided in an apertured mask type color picture tube having a substantially flat faceplate, a cathodoluminescent screen on the faceplate, a corrugated apertured mask adjacent the screen and electron gun means for producing and directing a plurality of electron beams through the mask to impinge upon the screen. The mask corrugations are substantially parallel and extend in a first direction with the varying corrugated waveform extending in a second direction. The mask includes an aperture width and/or an aperture-to-aperture spacing variation in the second direction which is a function of mask-to-screen spacing. The improvement comprises a further variation in aperture width and/or aperture-to-aperture spacing which is a function of (a) deflection angle of the electron beams, (b) the angle in a horizontal plane between tangents to the mask surface and a central contour through the mask, and (c) the angle in a horizontal plane between a tangent to the mask central contour and a plane perpendicular to the tube central longitudinal axis. In an additional improvement, aperture width also is varied because of the effective mask thickness or aperture step height.
REFERENCES:
patent: 4072876 (1978-02-01), Morrell
patent: 4122368 (1978-10-01), Masterton
patent: 4136300 (1979-01-01), Morrell
patent: 4146816 (1979-03-01), Morrell
D'Amato Ralph J.
Stone Robert P.
Bruestle Glenn H.
Irlbeck Dennis H.
RCA Corporation
Segal Robert
Whitacre Eugene M.
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