| 摘要 |
1,129,285. Fluorescent photographic record. MINNESOTA MINING & MFG. CO. Oct. 1, 1965 [Oct.27, 1964], No.41860/65. Heading G2C. [Also in Divisions C4, G5, H1 and H4] A photographic record comprises a fluorescent material in combination with a masking layer in which the information or image is recorded, e.g. a photographic or photo-chromic material, either in a single layer, or in distinct layers in contact with one another or separated by transparent support, spacer or conductive layers, Figs.1-4 (not shown). In particular, a fluorescent layer of 4 - dimethylamino chalcone dissolved in polymethylmethacrylate may be coated on a polyester film bearing a thin aluminium layer and a layer of vinylidene chloride n-butyl-acrylate copolymer containing 10% by weight of 4-phenylasodiphenyl amine dye in which an image is recorded by scanning with a modulated electron beam or exposure to UV light to selectively darken portions thereof. An alternative recording medium comprises a silver halide emulsion on a methyl cellulose backing, which is exposed to visible light to record information, and developed in a solution containing a fluorescent dye, e. g. sodium fluorescein. A further medium comprises a fluorescent film 0À25 mils thick of 4-dimethylamino chalcone in polyethylene terephthalate, coated with a thin aluminium layer and a layer of diazonium material in which a dark image is recorded by scanning with an electron beam and subsequent exposure to ammonia. Specific examples are given. Zinc silicate and zinc oxide phosphors and scintillators comprising perylene are also mentioned. The masking layer, instead of being structurally combined with fluorescent material may be held in contact with a fluorescent layer, e.g. by electro-static attraction. |
