Apparatus and method for cleaning shadow masks in color picture tubes
AssigneeRCA Corporation
InventorsKarl G. Hernqvist, Donald C. Pultorak
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Abstract
The present invention provides an improvement in shadow mask type color picture tubes. The improvement comprises a ferromagnetic member located within a tube and means for holding the ferromagnetic member within the tube. The invention also encompasses a method of utilizing the ferromagnetic member to remove particles from a shadow mask of a color picture tube. The method includes the use of a magnet to release the ferromagnetic member from the holding means and to move the ferromagnetic member over a surface of the shadow mask.
Claims6
In a shadow mask type color picture tube, the improvement comprising means for cleaning said shadow mask including
- a ferromagnetic member located within the tube and
- means for releasably holding said ferromagnetic member in a storage portion within the tube.
In a shadow mask type color picture tube, the improvement comprising means for cleaning said shadow mask including
- a ferromagnetic cylinder located within the tube and
- at least one spring for holding the cylinder in a storage position within the tube.
A method for cleaning particles from a shadow mask of a completed color picture tube comprising the steps of
- removing a ferromagnetic member from a holding means located within the completed color picture tube by moving a magnet external to the tube,
- relocating the ferromagnetic member to the shadow mask,
- moving the ferromagnetic member over a surface of the shadow mask by moving the magnet external to the tube, and
- replacing the ferromagnetic member in the holding means by moving the magnet external to the tube.
Dependencies are inferred from the claim text.