Color cathode ray tube device

Details Color cathode ray tube device Color cathode ray tube device

1986-05-21

1989-04-11

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, 313412, H01J 2970, H01J 2950

Patent

active

048209589

ABSTRACT:
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. 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: 3440482 (1969-04-01), Lister et al.
patent: 3735193 (1973-05-01), Ikeuchi
patent: 3789258 (1974-01-01), Barbin
patent: 3800176 (1974-03-01), Gross et al.
patent: 3930185 (1975-12-01), Barkow et al.
patent: 3975766 (1976-08-01), Sano et al.
patent: 3984723 (1976-10-01), Gross et al.
patent: 4689525 (1987-08-01), Shimoma et al.
20AX 110.degree. Colour Television: A Brief Outline, M. Prescott, pp. 186-197, 1/75.

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