Pulse width modulator for a printing device

摘要

A pulse width modulation technique is disclosed for use in an image forming device such as a laser printer or a photocopier. The technique implements a pacer to synthesize the frequency of a serializer circuit by stretching (or shrinking) pixel pulse train data. The pacer stretches the pixel pulse train data in accord with increment data that is based upon information about the image forming device, such as the number of bits in the pixel pulse train data, the number of bits in print engine pulse train, the target print engine frequency, and the serializer frequency. The technique can be implemented with digital circuits that provide digital test data.

主权项

1. An apparatus comprising:
a pixel signal generator configured to generate a pixel signal; an increment value processor configured to calculate increment value data to compensate for a pace of a beam moving along a scan line that is not in sync with a frequency of the pixel signal, wherein the increment value data is associated with a group of bits from the pixel signal and is calculated from at least one of a target print engine frequency and a serializer frequency; and a print engine signal generator configured to generate a print engine signal by adjusting the group of bits from the pixel signal using the increment value data to compensate, at least in part, for the pace of the beam moving along the scan line.