Koninklijke Philips Corporation N.V.

Jan Harmannus Post

Hernes Jacobs

J&ouml;rg Meissner

Wilhelmus Marinus Maria Van De Steen

Piet Christiaan Jozef Van Rens

Arnoldus Antonius Maria Hendriks

Hendrik Pancratius Maria Bergmans

A color display tube ( ) is disclosed having an improved suspension system of the color selection electrode ( ). The positional stability of the color selection electrode ( ) is of eminent importance for the color purity of the color display tube ( ). If the color selection electrode ( ) slightly shifts, the electron beams ( ) may impinge on electroluminescent material of the wrong color, leading to discolorations. It is recognized that this positional stability is improved by applying free end portions ( ) of a smaller diameter on the supporting elements ( ) because this will lower the friction between the free end portions ( ) and the suspension means ( ). This smaller diameter has the disadvantage that the insertion of the color selection electrode ( ) into the display window ( ) of the color display tube ( ) becomes more difficult. This invention solves this problem by applying free end portions ( ), which are provided with a centering tip ( ). In order to prevent scratches&mdash;which lead to loose particles in the color display tube ( )&mdash;when the color selection electrode ( ) is inserted or extracted, the free end portion ( ) is smoothly shaped.

Color display tube with improved suspension of the color selection electrode

A color display tube ( ) is disclosed, which comprises an improved suspension system of the color selection electrode ( ). The color display tube has suspension means that are constructed so as to be self-locking. The suspension means ( ) are provided with an additional flat portion ( ). This plate has an aperture ( ) that is shaped such that it has at least three surfaces of engagement ( ) for the free end portion ( ) of the supporting elements ( ) connected to the inside of the upright edge ( ) of the display window ( ). When the color display tube is exposed to shock loading, the construction of the flat portion ( ) is capable of absorbing this shock without the color selection electrode ( ) becoming detached from the supporting elements ( ). The action is based on the friction between the surfaces of engagement ( ) and the free end portion ( ). When a force is applied in the plane ( ) of the resilient element ( ), the suspension means ( ) slip from their rest position and are locked by a surface of engagement ( ), whereby the preload caused by the resilient element ( ) and the spring ( ) will cause the suspension means ( ) to resume its original position. In this manner, a color display tube ( ) with a good positional stability of the color selection electrode ( ) is obtained. Furthermore, the color selection electrode ( ) can be reclaimed in case the color display tube ( ) is rejected because there is no need to weld the suspension means ( ) to the free end portions ( ) anymore.

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Eindhoven, Netherlands

Jan Harmannus Post