Aperture grill supporting frame and manufacturing method thereof
AssigneeSony Corporation
InventorKenichiro Takayanagi
Life of this patent
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Abstract
This invention intends to provide an aperture grill supporting frame whereby forces exerted by damper wires on individual thin tapes constituting an aperture grill are uniform. This object is achieved by the following: the surfaces for welding of upper and lower frames of an aperture grill supporting frame are so processed from the beginning as to have sizes compensatory for deformations occurring as a result of pressurization and thus they will form a part of a columnar wall surface with a radius of R when they subject to deformations in the presence of a pressure. Thus, the surfaces for welding at both ends, for example, take a slightly bulged form as compared with a sector of a radius of R before they are subject to welding.
Claims7
An aperture grill supporting frame which is to be incorporated into an in-line cathode ray tube, and is to support an aperture grill with a grid of longitudinal slits, comprising:
- upper and lower frames for supporting said aperture grill by stretching it in a vertical direction;
- and
- left and right frames for connecting said upper and said lower frames at both ends thereof,
- wherein aperture grill welding surfaces of said upper and said lower frames, in advance of attaching said aperture grill, have an otherwise smooth curvature of a predetermined radius, and at least one bulging deformation in said otherwise smooth curvature, each bulging deformation creating an irregularity in said otherwise smooth curvature, bulging deformations being compensatory for pressurization when welding the aperture grill and subsequent pressure release, and thus cause said aperture grill welding surfaces to continuously form a part of a columnar wall with said predetermined radius when relieved of pressure.
Dependencies are inferred from the claim text.