Color cathode ray tube device

Details Color cathode ray tube device Color cathode ray tube device

1986-08-04

1987-08-25

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315368, 313412, H01J 2956

Patent

active

046895256

ABSTRACT:
A color cathode ray tube device in which three electron beams are generated so that they are arranged in-line in a horizontal plane to impinge through a shadow mask on a phosphor screen consisting of red, green and blue phosphors. These beams are generated practically parallel. In the deflection device that deflects the electron beams, the horizontal deflection magnetic field is made uniform and the vertical deflection magnetic field is made barrel shaped on the electron gun side and pin-cushion shaped on the phosphor screen. The half-width a of the magnetic flux distribution on the tube axis of the horizontal deflection magnetic field is set so that a/A=0.1 to 0.4, where A is the distance from the center of the magnetic flux density distribution to the phosphor screen surface. It is arranged that the picture signals modulating the respective beams are not mutually time-wise offset since the three electron beams are parallel. Thus little electron beam spot distortion is obtained over the whole picture screen.

REFERENCES:
patent: 3984723 (1976-10-01), Gross et al.
patent: 4142131 (1979-02-01), Ando et al.

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