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US 4,048,536 AGranted
Shadow mask with plurality of recessed regions extending across mask in two directions
AssigneeBuckbee-Mears Company
InventorSilas A. Brown
Life of this patent
Estimating the term…
Abstract
A shadow mask for a colored TV picture tube contains the conventional foraminous or translucent area formed by multiple vertical rows of miniature apertures or slits with the improvement being a pattern set of recesses which are located between the rows of slits and which extend into the margin of the mask. Because of the patterned set of recesses, doming the mask can be accurately and smoothly accomplished for insertion into the envelope of a colored television picture tube.
Claims6
An aperture mask having a plurality of openings therein for the projection of an electron beam therethrough comprising:
- a sheet of metal having a front side and a back side, said sheet of metal having a plurality of openings located therein, said plurality of openings forming a plurality of rows of openings, a plurality of cavities located on the back side of said mask with a cavity located around and including each of said plurality of openings in said mask;
- a plurality of recessed regions forming a pattern of recessed regions and located on the front side of said sheet of metal, said pattern of recessed regions extending across said mask in two directions so that said mask can be formed in at least two directions without rupturing said sheet of metal.
Dependencies are inferred from the claim text.