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Clock Synchronizer Utilizing Half Period Accuracy

IP.com Disclosure Number: IPCOM000035887D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28

Publishing Venue

IBM

Related People

Authors:
Wright, PB [+details]

Abstract

In a laser printing device, a sync signal is produced by the printhead to synchronize the start of printing with the actual position of the laser beam, this signal being produced by the laser striking a photodetector before reaching the image plane which sends a sync signal to the control electronics. To begin the printing of each scan, the detect signal must be used as a starting point for the timing operations such that the printing starts after a predetermined number of micro/nano seconds have elapsed from the laser detect point sensed by the photodetector. This time is determined by the use of a system clock.