Koninklijke Philips Corporation N.V.

Theodoor Christiaan Anna Hens

Wilhelmus Marinus Maria Van De Steen

Jean Winters

Rudolf Maria Jozef Voncken

Arnoldus Antonius Maria Hendriks

Maurice Andreas Wilhelmina Deuss

A display arrangement includes a cathode ray tube, inside which tube a mask with at least one curved outer edge is located. The mask is at least partly attached by at least part of the curved edge to the tube by means of at least a diaphragm arrangement. The diaphragm arrangement includes at least one diaphragm part in the form of an elongated folded sheet including a straight fold, said sheet extending from the straight fold to a curved fold and from the curved fold to a curved part of the sheet for attaching to the curved mask edge. Preferably, the straight fold has a varying folding angle and the curved fold follows a curve which enables the transition from the straight fold to the curved fold to provide a folded sheet which is free from inherent mechanical stress.

Display arrangement with reduced mechanical stress

In the manufacturing process of a color display tube ( ), the display window ( ) is assembled with the funnel shaped part ( ) in a furnace by subjecting them to a heat treatment. This heat treatment can lead to deformation of the color selection electrode ( ), because in color display tubes ( ) with an invar shadow mask ( ), the diaphragm parts ( ) are made from invar as well, while the corner sections ( ) are made from iron in order to obtain enough stiffness. The difference in expansion coefficient between invar and iron leads to shearing of the welds ( ) that connect the diaphragm parts ( ) to the corner section ( ). To overcome this problem the invention proposes to provide the diaphragm parts ( ) with slits ( ) or impressions ( ), which are arranged so that no stress occurs between the spot welds ( ) when the color selection electrode ( ) is heated.

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Eindhoven, Netherlands

Theodoor Christiaan Anna Hens