Cathode-ray tube screening exposure method
AssigneeRCA Corporation
InventorDouglas Earl Griesemer
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Abstract
An improvement in a method of making a luminescent screen structure for a cathode-ray tube is disclosed. The tube has a faceplate panel and an apertured color selection electrode in a predetermined position spaced from the panel. A photosensitive composition is coated on a surface of the panel. The solubility of the composition is altered when exposed to light through the electrode. The improvement comprises sensing the strength of a magnetic field passing through the electrode and adjusting the time and/or intensity of the exposure light as a function of the sensed strength of the magnetic field.
Claims5
In a lighthouse method of making a luminescent screen structure for cathode-ray tube having a faceplate panel and an apertured color selection electrode in a predetermined position spaced from said panel wherein a photosensitive composition is coated on a surface of said panel, said composition having a solubility which is altered when exposed to light through said color selection electrode, the improvement comprising,
- sensing the strength of a magnetic field passing through said color selection electrode and
- adjusting the degree of exposure of said composition to said light as a function of the sensed strength of the magnetic field.
Dependencies are inferred from the claim text.