Methods for applying phosphors particularly adapted for intagliated phosphor screens
First Claim
1. A method of dry depositing phosphor particles on a substrate, said substrate having an intagliated surface comprising a honeycomb array of a plurality of fiber optic rods, each etched to form a pit in the surface manifesting said array, comprising the steps of:
- depositing a thin uniform layer of metal on said intagliated surface to metallize each of said etch pits,spin coating said intagliated surface of said substrate with a thin thermoplastic film to uniformly coat said metallized etch pits,heating the assembly to bake the film at a predetermined temperature to soften the same,depositing dry phosphor particles on the heated thermoplastic coated surface,removing said thermoplastic coating by heating said substrate at a higher temperature than said predetermined temperature to remove the thermoplastic to cause said particles to enter said metallized etch pits,binding the particles in place in said etch pits with a binder.
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Accused Products
Abstract
A method is described for applying dry phosphor particles on a substrate, such as an intagliated array of fiber optic rods, each etched to form a pit in the surface. In this technique a thin layer of a heated thermoplastic is formed on the surface of the substrate to uniformly coat the etched pits and receive the phosphor particles. The plastic film is heated to receive the particles which are deposited upon the plastic layer. The particles become embedded in the plastic. The plastic layer is removed and the screen is then secured with a binder to fix the particles within the etch pits or cells of the intagliated array.
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Citations
21 Claims
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1. A method of dry depositing phosphor particles on a substrate, said substrate having an intagliated surface comprising a honeycomb array of a plurality of fiber optic rods, each etched to form a pit in the surface manifesting said array, comprising the steps of:
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depositing a thin uniform layer of metal on said intagliated surface to metallize each of said etch pits, spin coating said intagliated surface of said substrate with a thin thermoplastic film to uniformly coat said metallized etch pits, heating the assembly to bake the film at a predetermined temperature to soften the same, depositing dry phosphor particles on the heated thermoplastic coated surface, removing said thermoplastic coating by heating said substrate at a higher temperature than said predetermined temperature to remove the thermoplastic to cause said particles to enter said metallized etch pits, binding the particles in place in said etch pits with a binder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of dry depositing phosphor particles on a surface of an intagliated substrate of the type consisting of a plurality of fused fiber optic cables, each having an etched aperture on a surface to formulate said intagliated surface, comprising the steps of:
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spin coating said intagliated surface with an acrylic plastic to uniformly coat said apertures with said plastic, heating said coated assembly to a temperature of about 200°
C. for a period of approximately five minutes to bake and soften said plastic coating,uniformly applying dry phosphor particles to said plastic coated surface, baking said assembly at about 400°
C. for a period of about one hour to remove said acrylic plastic coating to cause said particles to enter said etch pits,binding said phosphor particles in place in said pits by immersing said assembly in a silicate solution. - View Dependent Claims (20, 21)
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Specification