Method of producing aperture grill

Details Method of producing aperture grill Method of producing aperture grill

1996-06-05

1998-01-20

Breneman, R. Bruce

Etching a substrate: processes

Forming or treating mask used for its nonetching function

216 56, 313403, 445 47, H01J 900, B44C 122

Patent

active

057098042

ABSTRACT:
An aperture grill for a cathode ray tube is formed with parallel slits by etching a cold-rolled low-carbon steel plate from the opposite sides thereof. Before carrying out the etching, the steel plate is subjected to an annealing step whereby the residual stress is reduced to 7.0 Kg/mm.sup.2 or less. The steel plate is also subjected to a tensile force for imparting a tension in the direction of the rolling of a hoop steel from which the steel plate is produced. Furthermore, the steel plate is so oriented that the direction of tapes of the aperture grill to be produced will coincide with the rolling direction. The above process makes it possible to prevent occurrence of "streaks" and improves the quality of images generated on the cathode ray tube.

REFERENCES:
patent: 4210843 (1980-07-01), Avadani
patent: 4662984 (1987-05-01), Ohtake et al.
patent: 4671776 (1987-06-01), Tokita
patent: 4769089 (1988-09-01), Gray
patent: 4846747 (1989-07-01), Higashinagawa et al.
patent: 5006432 (1991-04-01), Sagou et al.
patent: 5585224 (1996-12-01), Makita et al.

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