FIRST ORDER LASER SCAN BOW COMPENSATION MECHANISM
Original Publication Date: 1995-Feb-28
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
AbstractIt is known that the problem of bow is introduced if the polygon's scan axis is not ortho onal to the optical projection axis. In effect, a scanned beam traces desired for printed material. However, even if the strai ht scan beam is used,
XEROX DISCLOSURE JOURNAL
FIRST ORDER LASER SCAN BOW Proposed Classification COMPENSATION MECHANISM U.S. C1.350/016.7 Frank C. Genovese Int. C1. G02b 26/10
XEROX DISCLOSURE JOURNAL - Vol. 20, No. 1 January/February 1995 31
FIRST ORDER LASER SCAN BOW COMPENSATION MECHANISM (Cont'd)
It is known that the problem of bow is introduced if the polygon's scan axis is not ortho onal to the optical projection axis. In effect, a scanned beam traces
desired for printed material. However, even if the strai ht scan beam is used,
an uneven clamping stress.
out one o f a family of hyperbolas, only one of which is straight, the one that is
steering mirrors can introduce bow if they are distorted
P or any reason, such as
As discussed above, bow in laser scanners can be caused by slightly misaligned optical components and distorted mirrors. To compensate for this problem, precision scanners have been designed to minimize the effects of small misalignments. However, it is difficult to guarantee the absence of residual bow without subsequent adjustment.
A solution to eliminating residual bow is to remove the residual bow by introducing reverse bow. Reverse bow can be introduced by tweaking the axis of the polygon motor after assembly. As illustrated in the Figure, an example of a simple flex hinge mechanism 1 that provides a rigid mounting for the polygon mirror 2 is shown. The tilt of the motor axis 3 can be...