Color purity adjusting method

Details Color purity adjusting method Color purity adjusting method

1978-02-06

1980-05-06

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural ray-type tube

358 10, H01J 2950, H01J 3100

Patent

active

042019320

ABSTRACT:
To adjust for color purity for a cathode ray tube, an auxiliary magnetic field magnetizes metallic components including the metal shadowmask. A remanent magnetic field is created upon removal of the auxiliary field and is used as an aid in purity adjustment. The cathode ray tube is operated to generate a color pattern on the screen and then purity is adjusted to produce a color pattern indicative of correct color purity.

REFERENCES:
patent: 3737716 (1973-06-01), Gerritsen
patent: 3748526 (1973-07-01), Wedam
patent: 3887833 (1975-06-01), Yamazaki
patent: 3916437 (1975-10-01), Barbin
patent: 4137548 (1979-01-01), Kelly et al.
patent: 4159456 (1979-01-01), Smith
Gerritsen, A New Method of Color Purity Adjustment, Mullard Tech. Communications 116, Oct. 1972, pp. 197-200.

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