Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1980-05-29
1983-01-18
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
358 68, 313403, H01J 2974, H01J 2976
Patent
active
043693962
ABSTRACT:
In shadow mask color cathode-ray tube apparatus, the shadow mask is provided with slits or rows of slots extending from side to side of the mask and a line raster is constrained so that the lines of the raster are colinear with the slits, there being just one slit to each line of the raster. Open loop control may be used to achieve colinearity, but closed loop control is preferred. Beam position signals may be drived from the shadow mask by sensing secondary emission from different phosphors on the gun side of the mask or be sensing currents generated in the mask. In the preferred embodiment, the beams are dithered as they traverse the raster and the difference in the currents generated by a beam at the mask and at the conductive layer at the tube screen is detected. The first fundamental of the difference current indicates by its amplitude and phase the amount and direction of the misregistration of a beam and a slit. Different beams are distinguished by frequency multiplexing.
REFERENCES:
patent: 2900562 (1959-08-01), Burns, Jr.
patent: 2943219 (1960-06-01), Bryan
patent: 2961576 (1960-11-01), Burgett, Jr.
patent: 3030439 (1962-04-01), Justice
patent: 3099769 (1963-07-01), Lynch
patent: 3328520 (1967-06-01), Macaulay
patent: 3431456 (1969-03-01), Liebscher
patent: 3501583 (1970-03-01), Schwartz
patent: 3784735 (1974-01-01), Brown et al.
patent: 3800072 (1974-03-01), Lejon
patent: 3889145 (1975-06-01), Suzuki et al.
Blum Theodore M.
Connerton Joseph J.
International Business Machines Corp.
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