Optical scanning and encoding device

Details Optical scanning and encoding device Optical scanning and encoding device

G - Physics

01

D

350/7, 101/96.02

G01D 15/16 (2006.01) H04N 1/405 (2006.01) H04N 1/407 (2006.01)

Patent

CA 1088998

Abstract of the Disclosure An optical scanning and encoding device for providing a print signal pulse train to an ink jet printer in which a master image, including a reference image area, is scanned along a scan line. An optical scanner scans the master image and provides a signal which is inversely related to the print density of the image along the scan line. An integrator inte- grates the density signal during receipt of a gating signal pulse. A level detector detects when the integrator output has reached a predetermined level and provides a pulse to the printer and to an integrator reset circuit. A reference level means, responsive to scanning the reference image area, provides a signal output indicative of the maximum print density in the master image. A tachometer provides tachometer pulses at a frequency proportional to the rate at which the master image is scanned along the scan line. Means are responsive to the output of the reference level means and to the tachometer means for providing gating signal pulses to the integrator means, which pulses are of a frequency proportional to the tachometer pulses. Each of the gating signal pulses is inversely proportional in duration to the output o the reference level. The pulse signal to the printer is therefore compensated for fluctuation in the rate at which the master image is scanned and also for fluctuations in the optical path of the scanning means. -1-

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