Differential fiber optic sensing method and apparatus for ink je

Recorders – Record receiver deforming

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250227, 350 9624, G01D 1800

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active

042557542

ABSTRACT:
Optical fibers are used to sense fluid ink drops along the x, y and z axis of an orthogonal coordinate system. A drop sensing zone is defined in the narrow space between the faces of a single input fiber and two output fibers. An LED infrared light source is coupled to a remote end of the input fiber. Infrared sensitive photodiodes are coupled to the remote ends of each output fiber. The photodiodes are in turn coupled to a differential amplifier whose output represents a displacement error for the x and y axis and represents a time reference for the z axis for the case where the drop flight path is along the z axis. A plurality of sensors are disclosed in an ink recording system having a plurality of nozzles and in an ink recording system having an ink generator traversing the length of a high speed rotating drum.

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patent: 3907429 (1975-09-01), Kuhn
patent: 3969733 (1976-07-01), DeMoss
patent: 4062620 (1977-12-01), Pirolli
patent: 4067019 (1978-01-01), Fleischer
patent: 4117460 (1978-09-01), Walworth
patent: 4136345 (1979-01-01), Neville
Fan G. J.; Phase Detection on Ink Jet Drops; IBM Tech. Disc. Bulletin, vol. 16, No. 3, Aug. 1973, p. 880.
Chen et al; Feedback for Synchronized Pressure Jet Using Optical Sensor; IBM Tech. Disc. Bulletin, vol. 16, No. 12, May 1974, pp. 3877-3878.
Kuhn et al; Ink Drop Velocity Measurement Via Coded Plates and Photodetectors, IBM Tech. Disc. Bulletin, vol. 17, No. 5, Oct. 1975, p. 3069-3069A.
Fleischer et al; Optical Ink-Drop Sensor; IBM Tech. Disc. Bulletin, vol. 19, No. 5, Oct. 1976. p. 1870-1871.

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