Phosphor screen for correcting luminous non-uniformity and method for making same
AssigneeITT Corporation
InventorDaniel D. Duggan
Life of this patent
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Abstract
To correct luminous non-uniformity of light provided by a phosphor screen, the phosphor efficiency is varied across the diameter of the phosphor screen. A material that reduces the efficiency of phosphor is deposited on the face of the phosphor screen, such that the material compensates for the luminous non-uniformity and provides a uniform distribution. The material, which can be aluminum, is deposited onto the phosphor screen by a evaporation process.
Claims19
In apparatus for converting an electron emission into visible light, said apparatus including a fiber optics element having an input plane and an output plane, and a phosphor screen deposited on said input plane, said light produced by said phosphor screen having a luminous non-uniformity at said output plane, the improvement therewith comprising a film of a material that reduces phosphor efficiency, said material being deposited on said phosphor screen such that said film compensates for said luminous non-uniformity and provides a uniform luminous distribution at said output plane of said fiber optics element.
In an image intensifier system having electron emission means for converting radiation into an emission of electrons, a phosphor screen, responsive to said emission means, for converting said electron emission into visible light and a fiber optics element having an input plane and an output plane, said phosphor screen being deposited on said input plane, said light produced by said phosphor screen having a luminous non-uniformity at said output plane, said improvement wherein a material that reduces phosphor efficiency is deposited on said phosphor screen, such that said material compensates for said luminous non-uniformity and provides a uniform luminous distribution at said output plane.
A method of correcting luminous non-uniformity in a system that employs means for converting an electron emission into visible light, said means including a fiber optics element having an input plane and an output plane, and a phosphor screen deposited on said input plane, said light produced by said phosphor screen having a luminous non-screen uniformity at said output plane, said method comprising the steps of depositing a material that reduces phosphor efficiency on said phosphor screen, such that said luminous non-uniformity at said output plane is compensated for.
Dependencies are inferred from the claim text.