Output Hardcopy Devices by Robert Durbeck (Eds.)

By Robert Durbeck (Eds.)

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Simplified Block Diagram CRT Recorder or Scanner (showing Fiber Optic CRT Output). giving us 700 microwatts at the outside surface of the fiber optic face. In a 50 micron diameter spot there are approximately 20 X 10-6 square centi­ meters. Therefore power to material in contact with the faceplate is 35 watts/cm2. Given a sweep from which spot dwell time can be derived (how long the spot occupies its own diameter), available energy per square centimeter can be calculated. 3 cm line with a 50 micron spot size gives a spot dwell time of 250 nsec.

Power input to the phosphor for this example is then 100 milliwatts, which is less than one-tenth the power input of a tube in a typical color TV set. Phosphor efficiencies run in the neighborhood of 1% to 5% watts per watt. An available line emitting red phosphor peaking at 625 nm has an efficiency of 2% W/W. Thus for this example, approximately 2 milliwatts is being radiated forward lambertian into the fibers in front of the spot. 0 6 0 o ^-CLADDING DRAW (a) (b) / { CARBONy' V? 10. Simplified Process Steps for Manufacture of Fiber Optic CRT Faceplates.

1980, 17, 19. 3. Shiragake, K. et al. “Color Plotter Printer for Personal Computers”, Natl. Tech. Rep. (Japan) 30 (2), June 1984, 341-348. 4. Ueda, S. et al. “High Speed XY Plotter Drive Control”, Electr. Commun. Lab. Tech. J. (Japan) 29 (3), 1980, 501-521. 5. Watanabe, K. “Better Materials and Design Yield More Versatile Pen Recorders”, JEE (Japan) 20 (196), April 1983, 28 -3 0 . 1 Historical Review and Applications William Crookes is generally credited with the discovery of “cathode rays” in an evacuated envelope.

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