Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1987-02-04
1988-08-30
Boudreau, Leo H.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313293, 313295, 313349, H01J 326, H01J 2970
Patent
active
047679646
ABSTRACT:
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.
REFERENCES:
patent: 2619438 (1952-11-01), Varian et al.
patent: 3240972 (1966-03-01), Law
Angello Paul S.
Boudreau Leo H.
Tektronix Inc.
Wieder K.
Winkelman John D.
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