Koninklijke Philips Corporation N.V.

Ludovic Peter Willem Huysmans

Wilhelmus Marinus Maria Van De Steen

In color display tubes ( ) the color purity performance is of the utmost importance. One of the factors adversely affecting this color purity performance is the microphony behavior of the shadow mask ( ). Vibrations or shocks coming from outside the color display tube ( ) can be transferred to the shadow mask ( ) via the suspension means ( ) of the color selection electrode ( ). By introducing a vibration damping element ( ) coupled to the resilient element ( ) of the suspension means ( ), the amount of spot shift on the screen ( ) due to these vibrations is reduced by at least 50%. The vibration damping element ( ) is preferably a flat plate which is rigidly coupled with one side to the suspension means ( ), while the other side is in close contact with the resilient element ( ), as a result of which it is capable of absorbing said vibrations.

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Eindhoven, Netherlands

Ludovic Peter Willem Huysmans