Color cathode ray tube having an improved shadow mask and shadow

Details Color cathode ray tube having an improved shadow mask and shadow Color cathode ray tube having an improved shadow mask and shadow

1997-11-13

1999-06-08

Patel, Vip

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313402, 313408, H01J 2907

Patent

active

059107022

ABSTRACT:
A shadow mask type color cathode ray tube includes a generally rectangular shadow mask having a curved apertured portion having a multiplicity of electron-transmissive apertures, a curved imperforate portion surrounding and integral with the apertured portion and a skirt portion bent back from a periphery of the curved imperforate portion to form a rearwardly extending wall, and a generally rectangular support frame for suspending the shadow mask by spot welding the skirt portion thereto, within a panel portion of the color cathode ray tube, and at least one of short and long sides of the skirt portion contains only a pair of embossments extending in a direction parallel to a longitudinal axis of the color cathode ray tube on opposite sides of the spot welding point of the support frame and the skirt portion at a center of the at least one of short and long sides of the skirt portion within a distance of one fourth or less of a length of the at least one of short and long sides of the generally rectangular shadow mask from the center.

REFERENCES:
patent: 3351996 (1967-11-01), Fiore
patent: 3585431 (1971-06-01), Long
patent: 3855493 (1974-12-01), Snook et al.
patent: 3878427 (1975-04-01), Godfrey
patent: 3912963 (1975-10-01), Sedivy
patent: 4122368 (1978-10-01), Masterton
patent: 4146816 (1979-03-01), Morrell
patent: 4949009 (1990-08-01), Iwamoto
patent: 5576595 (1996-11-01), Inoue

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