Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1996-07-10
1999-03-09
Patel, Ashok
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313407, 313479, H01J 2906
Patent
active
058805559
ABSTRACT:
A color cathode ray tube for permitting electron beams emitted from an electron gun to pass through apertures of a shadow mask and collide onto phosphors coated on the inner surface of a panel to thereby reproduce image information includes a magnetic shielding body which, for decreasing an influence of a terrestrial magnetic field, is formed of a rectangularly-shaped magnetic material and has one ends supported by the shadow mask to be symmetrical along the horizontal and vertical axes of the tube, and a plurality of notches formed into the magnetic shielding body are classified by the horizontal and vertical axes to be distributed asymmetrical with respect to the horizontal or vertical axes within four quadrants partitioned by the horizontal and vertical axes. Thus, the quantity of the landing variation in a specific portion having the greater quantity of the landing variation is reduced during the change of an outer magnetic field or the direction shift of the cathode ray tube.
REFERENCES:
patent: 4019085 (1977-04-01), Sakata
patent: 4580076 (1986-04-01), Simoma et al.
patent: 5519283 (1996-05-01), Opresko et al.
LG Electronics Inc.
Patel Ashok
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