Grid apparatus for a color cathode ray tube which eliminates vib

Details Grid apparatus for a color cathode ray tube which eliminates vib Grid apparatus for a color cathode ray tube which eliminates vib

1990-04-17

1992-05-05

Boudreau, Leo H.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313404, 445 47, H01J 2980

Patent

active

051111071

ABSTRACT:
A grid apparatus which has a multiplicity of ribbon-shaped grid elements stretched in tension and attached to a frame which comprises a pair of support bars and a pair of resilient support members. Metallic members which have a larger thermal expansion coefficient than the resilient support members are connected to the reverse surfaces of the resilient support members opposite the side to which the grid-elements are attached. In the grid apparatus during heat treatment, thermal creep of the grid elements is prevented so that the tension of the grid elements will remain high when the normal temperature state is resumed. A method of making such grid apparatus includes an additional heat treatment such as a blackening process after the reduction of the tension applied to the grid elements by the resilient support members and the support bars, hence preventing thermal creep of the grid elements to produce a high-reliability with high tension of the grid elements.

REFERENCES:
patent: 4437036 (1984-03-01), Ragland, Jr.
patent: 4495437 (1985-01-01), Kume et al.
patent: 4756702 (1988-07-01), Steiner
patent: 4904218 (1990-02-01), Tong
Japanese Abstract, vol. 12, No. 168 E-611 3015, May 20, 1988.
Japanese Abstract, vol. 12, No. 127 E-602 2974, Apr. 20, 1988.
Japanese Abstract, vol. 6, No. 123 E0117 0001, Jul. 8, 1982.
Japanese Abstract, vol. 10, No. 302 E-445 2358, Oct. 15, 1986.
PP. D-190-D-191, Commercial Metals and Alloys 1970.

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