Recorders – Writers – Receiver and marker movable
Patent
1977-12-15
1979-10-23
Hartary, Joseph W.
Recorders
Writers
Receiver and marker movable
346136, G01G 1514
Patent
active
041722590
ABSTRACT:
The beam of a line scan fiber optics cathode ray tube is intensity modulated and is repeatedly swept along the fiber optics strip of the tube by a horizontal deflection coil to place on a transversely moving record sheet recorded gray scale images which are representative of received data signals. A sheet velocity sensor, a frequency to voltage converter, and a differentiator produce a voltage signal proportional to short term sheet velocity errors, and an integrator converts that signal into a signal which represents the time integral of each of such errors. The integral signal controls a vertical deflection coil for the tube so that each of the sheet velocity errors is accompanied by a movement of the cathode ray tube beam in the vertical direction, and hence along the path of sheet travel. This vertical beam movement maintains the instantaneous relative velocity between the sheet and the beam substantially constant notwithstanding the short term sheet velocity errors. In this way, the density of the recorded images in the direction of sheet movement is substantially unaffected by the short term sheet velocity errors.
REFERENCES:
patent: 3137768 (1964-06-01), Mullin
patent: 3434158 (1969-03-01), Stauffer
patent: 3482255 (1969-12-01), Baker
patent: 3764737 (1973-10-01), Fischman
Bodenstein George E.
Burton Lockwood D.
Hartary Joseph W.
Honeywell Inc.
Marhoefer Laurence J.
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