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Browse Prior Art Database


IP.com Disclosure Number: IPCOM000025959D
Original Publication Date: 1989-Apr-30
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


The basic concept is to sense variations in the imaging surface (photoreceptor) velocity of a printer, and correspondingly electronically change the print action rate (flash rate) of a linear array LED or liquid crystal print bar extending transversely across the imaging surface. Thus, even line spacing printing will be provided on the imaging surface, and thus the copy sheet therefrom, in spite of variations in the photoreceptor drive speed, and without requiring a servo drive. This is enabled by the simultaneous line-pixel printing of the LED or liquid crystal linear print head array. The latch pulse rate used to latch data to all the drivers can simply be correspondingly advanced or retarded. The image surface velocity can be read from a timing track on the photoreceptor or from motion sensors on its drive motors or gears.