Laser printer with piezoelectric apparatus to reduce banding by

Details Laser printer with piezoelectric apparatus to reduce banding by Laser printer with piezoelectric apparatus to reduce banding by

1997-05-13

2000-05-02

Le, N.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

B41J 2305

Patent

active

06057867&

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 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 having a mirror attached to a piezoelectric bimorph crystal cantilever element. 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.

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patent: 5359434 (1994-10-01), Nakao et al.
patent: 5760817 (1998-06-01), Foote et al.
European Search Report--EP 95 10 3769--dated Dec. 19, 1995.

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