Printing control apparatus compatible with printing systems of a laser scanning unit type and a light emitting diode type

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide an improved printing control apparatus which overcomes the aforementioned deficiencies in the art.
It is another object to provide a printing control apparatus that is compatible with printing systems of a laser scanning unit type and a light emitting diode type printing systems.
It is still another object to provide a printing control apparatus that is applicable to printing systems of a laser scanning unit type and a light emitting diode type printing systems.
It is a yet further object to provide a printing controller that enables video image data to be printed on both laser scanning units and on light emitting diode printing units.
It is a still yet further object to provide a single integrated circuit chip having a printing controller regulating printing of video image data by both laser scanning unit and on light emitting diode unit printing systems.
It is a further object to provide a printing control apparatus that reduces manufacturing costs and has a compact configuration.
These and other objects may be achieved according to the principles of the present invention, with a printing control apparatus comprising a synchronizing signal supplying circuit that receives at least one signal out of a light emitting diode horizontal synchronizing signal generated when a period of a horizontal synchronizing signal of a light emitting diode type coincides with a given counting period and a beam detecting signal generated by a laser scanning unit, and supplies a horizontal synchronizing signal corresponding to a printing system in response to a synchronizing select signal.
A clock generating circuit connected to the synchronizing signal supplying circuit, that determines the counting period, generates a reference clock necessary for the generation of a plurality of signals, and generating a video clock from the reference clock in response to the horizontal synchronizing signal and a latch driving signal from the reference clock in response to the synchronizing select signal