Color CRT with insulating stud pins for shadow mask support

Details Color CRT with insulating stud pins for shadow mask support Color CRT with insulating stud pins for shadow mask support

1991-11-07

1993-05-25

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313477R, 220 23A, H01J 2907, H01J 2986

Patent

active

052143481

ABSTRACT:
The applications of the CRT proposed by the present invention include televisions and computer terminals, and the object of the present invention is to increase electrical security of the CRT. The CRT has a metal part 8 forming a vacuum glass container in order to reduce the weight of the CRT. A stud pin 12 made of an insulating material is on the inner surface of the metal part and fixes the shadow mask. The metal part 8 is joined between an edge of the panel screen 2a and an edge of the funnel 4, and forms a part of the vacuum container where the highest stress is applied. The stud pin 12 is fixed to the inner surface of the metal part 8 and fixes the shadow mask 10 by sealing to a plate spring 13 welded to the edge of the shadow mask 10. Since the stud pin 12 is insulating, it electrically separates the metal part 8 from the high voltage shadow mask 10. The stud pin 12 has a constriction or a multistage fin, and around the stud pin shielding material 16 made of a metal mesh or a metal plate is placed.

REFERENCES:
patent: 2727172 (1955-12-01), Mark et al.
patent: 2855529 (1958-10-01), Morrell
patent: 3404769 (1968-10-01), Bishop
patent: 4638213 (1987-01-01), Deal et al.
Patents Abstracts of Japan (in Re Kokai No. 53-145558), E-90, vol. 3, No. 17, Feb. 1979.

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