Laser printer with apparatus to reduce banding by servo adjustme

Details Laser printer with apparatus to reduce banding by servo adjustme Laser printer with apparatus to reduce banding by servo adjustme

1996-03-22

1998-06-02

Fuller, Benjamin R.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347261, B41J 247, B41J 2435, G11B 708, G01D 1534

Patent

active

057608172

ABSTRACT:
A print apparatus includes a photoconductor and a mechanical system for moving the photoconductor past a scan line exposure station. The print apparatus includes a test signal generator for providing outputs indicative of the movement of the photoconductor. A first comparator produces a first position error signal that is derived from a difference between a reference signal and a position error signal output, such position error signal indicating that the position of the photoconductor differs from a predetermined print position that is determinable with respect to the reference signal. The print apparatus further includes a laser beam scanner and a beam detector for producing a scan position signal. A second comparator is responsive to the scan position signal and the position error signal from the first comparator to produce a beam deflection control signal that is applied to a beam deflector. The beam deflector moves the laser beam in a direction which reduces the beam deflection control signal and position the laser scan at a position closer to a predetermined print position.

REFERENCES:
patent: 4167024 (1979-09-01), Hamisch
patent: 4227070 (1980-10-01), Hopson et al.
patent: 5049897 (1991-09-01), Ng
patent: 5083140 (1992-01-01), Peterson et al.
patent: 5153644 (1992-10-01), Yang et al.
patent: 5245181 (1993-09-01), Cho
patent: 5264870 (1993-11-01), Egawa

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