Phaselock Loop Synchronizing System For Laser Printer
Original Publication Date: 1979-Jul-01
Included in the Prior Art Database: 2005-Feb-20
In a laser printing system such as that disclosed in U.S. Patent 3,835,249, a scanning light beam is split into two parts: a writing beam and a synchronizing beam. While the writing beam scans the printing surface, the synchronizing beam scans an optical grating. A light detector behind the grating responds to the chopped synchronizing beam by providing an output signal indicating the physical position of the writing beam. This signal is used to clock information into the modulator of the writing beam.