Color printing system
阅读：822发布：2021-11-28
专利汇可以提供Color printing system专利检索，专利查询，专利分析的服务。并且An exposure control system having application in a color contact printer wherein the master film is sampled on a line at a time basis by a detecting head. The detecting head may comprise a continuous light source, a cylindrical lens, a light pipe and a plurality of photodetectors. Each photodetector furnishes an output representing the sensed light which has been modulated in color and intensity as the result of its passage through the master film. This detected or sensed light is thereafter applied to an analog computer for processing. The computer furnishes control data to a plurality of phosphor-excited printing light sources which are modulated in color and intensity thereby. Concurrently, the printing light sources expose duplicating material or film while in contact with the master film.，下面是Color printing system专利的具体信息内容。
1. A continuous motion photographic color contact printer having an exposure control system for sampling master film comprising: a. a continuous light source; b. a cylindrical lens interposed between said light source and said master film for focusing said light source into a line source for projection upon said master film as said master film continuously travels past said light source; c. a light pipe having a flat surface normal to the light modulated in color and intensity as it passes through said film and an arcuate surface for reflecting said modulated light on to a second flat surface of said light pipe joining said first flat surface at an angle of 90* and said arcuate surface connecting the free ends of said flat surfaces; d. a plurality of photodetectors each adapted to sense a particular spectrum of said modulated light, and adapted to have individually controllable gain factors, said photodetectors being located adjacent said second flat surface of said light pipe and there being one photodetector for each of the red, green and blue spectrum of said continuous light source; e. a plurality of amplifiers adapted to receive the output signals from said photodetectors and to adjust said signals to compensate for individual characteristics of said photodetectors; f. computer means connectable to said amplifiers and adapted to receive said detected color and intensity-modulated light signals from said amplifiers and to process said signals and to furnish at its output signals indicative of the color and intensity of said detected light; g. a plurality of printing light sources connectable to said computer means each of said printing light sources being adapted to be modulated by the output signals of said computer means; h. duplicating material; and i. means for transporting said master film and duplicating material to the printing gate of said printer said master film and duplicating material adapted to be in contact relationship in said printing gate at the time each of said printing light sources are receiving signals from said computer means whereby said contacting master film and duplicating material are exposed to said light emanating from said printing light sources.
2. A continuous color contact printer in accordance with claim 1 wherein said printing light sources comprise a red, green and blue light source each of said printing light sources being individually controllable and each related to a corresponding red, green and blue photodetector.
3. A continuous color contact printer in accordance with claim 2 wherein each of said printing light sources further comprises an elliptical phosphor coated mirror and a phosphor-coated density filter adapted to reduce the scattering of light from said mirror, said Phosphor coating being excited by said signals from said computer to emit red, green and blue light for its respective elliptical mirror and density filter.
4. A continuous color contact printer in accordance with claim 3 wherein said red phosphor comprises zinc phosphate with a europium trace activating agent, said blue phosphor comprises calcium magnesium silicate with a tungsten trace activating agent and said green phosphor comprises zinc orthosilicate with a manganese trace activating agent.
5. A continuous color contact printer in accordance with claim 4 wherein the printing light sources are each arrayed to project its light on to a common line of a reflecting mirror surface.
6. A step and repeat open gate color contact film printer for sampling master film having an exposure control system comprising: a. continuous light source; b. a cylindrical lens interposed between said master film and said light source for focusing said light onto said master film on a line at a time basis said light being modulated in color and intensity as it passes through said film; c. a light pipe having a flat surface normal to said modulated light and an arcuate surface for reflecting said light on to a second flat surface of said light pipe, said first and second flat surfaces joining at an angle of 90*, and said curved surface joining the free ends of said flat surfaces; d. a plurality of photodetectors each adapted to sense a particular spectrum of said modulated light, said photodetectors being located in the second flat surface wall of said light pipe; e. computer means comprising amplifier means adapted to receive output signals from said photodetectors, said computer means processing said signals representative of said detected modulated light, f. a buffer store in said computer means for storing the processed signals until said master film reaches the printing gate of said printer, g. a plurality of printing light sources mounted in an air bearing pad, said printing light sources each being individually controllable and adapted to be modulated by output signals from said computer means, h. duplicating material, and i. means for transporting said master film and said duplicating material to said printing gate said master film and duplicating material adapted to be in contact relationship in said printing gate for exposure to said printing light sources whereby the modulated light emanating from said printing light sources transfers the image on said master film to said duplicating material with the same color and intensity of said master film.
7. In a step and repeat printer in accordance with claim 6 wherein said photodetectors are red, blue and green and wherein said printing light sources are each respectively enclosed within a red, blue and green phosphor coated elliptical mirror.
8. The apparatus according to claim 7 wherein said air bearing pad is adapted to float on a cushion of air over said master film and duplicating material in said printing gate.
9. The apparatus according to claim 8 wherein said printing light sources are arrayed to emit light on to a common focal line.
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