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US 4,767,964 AGranted
Improved mesh for CRT scan expansion lens and lens fabricated therefrom
AssigneeTektronix, Inc.
InventorJ. Kirk McGlothlan
Life of this patent
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AssigneeTektronix, Inc.
InventorJ. Kirk McGlothlan
Estimating the term…
An improved mesh lens for PDA-type cathode-ray tubes is constructed in a manner that permits deformation into a concavo-convex shape with a substantially shorter radius of curvature than heretofore obtainable with prior art devices. A mesh lens (12) formed in accordance with this invention particularly comprises of multitude of interconnected webs (58) forming an array of apertures (60). Each web (58) has opposing ends and a midline (62) extending between those ends. The mesh (12) is configured so that an individual aperture (60) of the array is formed by a set of webs (58) interconnected at their ends. The midline (62) of each web in the undeformed mesh defines a bent line. The mesh can be deformed into a concavo-convex shape having a relatively short radius of curvature. This is so because the individual webs of the mesh respond to the application of deformation forces by initially straightening, thereby effectively delaying the development of tensile stresses in the webs.
A deformable mesh for fabricating a scan expansion mesh lens for use in an electron discharge tube, said mesh comprising a multitude of interconnected webs forming an array of apertures, each web having opposing ends and a midline extending between the ends, the mesh being configured so that each aperture of the array is formed by a set of webs interconnected at their ends, and the mesh being further configured so that, in its undeformed state, the midlines of at least some of the interconnected webs define bent lines.
A deformable mesh for fabricating a scan expansion mesh lens for a cathode-ray tube, comprising in its undeformed state a multitude of electrically conductive interconnected webs forming an array of apertures, each web having opposing ends and a midline extending between the ends, the mesh being configured so that each aperture of the array is formed by a set of webs interconnected at their ends, the midlines of at least some of the interconnected webs defining bent lines.
A method of fabricating a mesh scan expansion lens, comprising the steps of
A cathode-ray tube, comprising:
Dependencies are inferred from the claim text.