Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-06-30
1983-01-11
Martin, John C.
Facsimile and static presentation processing
Facsimile
Recording apparatus
350 66, 350486, 250235, H04N 308, G02B 2717
Patent
active
043684890
ABSTRACT:
A galvanometric tilting-mirror scanning system shifts an image of an original projected onto a photodiode row in a direction transverse to such row. The tilting-mirror mechanism is provided with an oil-filled damping chamber, heated and maintained at stabilized temperature. The control voltage driving the tilting-mirror system includes a sawtooth component whose lower-slope flanks determine the mirror's scanning sweep; a negative pulse which effects mirror tiltback or flyback; a positive pulse which brakes the tiltback and accelerates the mirror back up to its forwards-direction scanning-sweep speed; and finally a corrective component. The corrective component has the form of a pulse which increases the slope of the sawtooth component's lower-slope flanks during a time interval extending beyond the system's vertical blanking allotment, to compensate the non-linearity in the motion of the mirror which would exist during its forwards-direction scanning-sweep interval in the absence of the corrective component.
REFERENCES:
patent: 2993403 (1961-07-01), Harries
Ruf Wolfgang
Stemme Otto
Wagensonner Eduard
Agfa-Gevaert AG
Martin John C.
Striker Michael J.
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