Recorders – Writers – Receiver and marker movable
Patent
1985-02-22
1986-01-14
Goldberg, E. A.
Recorders
Writers
Receiver and marker movable
346136, 358216, 307116, G01D 942, G01D 1524
Patent
active
045648492
ABSTRACT:
A compensation circuit is described for use in a line scan type recording apparatus where an electron beam is scanned on the face of a fiber optic cathode-ray tube (FOCRT) in synchronization with a movable recharging medium. The compensation circuit includes a charge pump circuit, an integrator circuit, and a current source. The charge pump circuit draws a constant charge from the integrator circuit in response to a repetitive series of stepper pulse corresponding to the velocity changes in the recording medium. The current source generates a constant current that flows into the integrator circuit and is equal to the average DC current flowing out of the integrator circuit via the charge pump circuit. The output voltage of the integrator circuit is used for controlling the vertical displacement of the electron beam of the FOCRT in synchronization with the movable recording medium. A DC stabilization circuit and a sample-and-hold circuit may be included for stabilizing the average DC voltage level of the integrator output voltage and for removing the sweep and recovery noise from the integrator output voltage respectively.
REFERENCES:
patent: 4172259 (1979-10-01), Lowe
Rogers Jerrold J.
Sirotiak Judd L.
Goldberg E. A.
Gray Francis I.
Hulse Robert S.
Noe George T.
Reinhart Mark
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