Patent ID: 6229559
Filing Date: 2001-05-08
Classification: B41J,G06K,H04N

Abstract:
A method for forming a latent image on a photo receptor belt by repeatedly scanning the photo receptor belt in a first direction along a scan path with a laser beam modulated in accordance with image data, the photo receptor belt moving continuously in a direction substantially transverse to the scan path, but also being subject to unwanted movement along the scan path, the method comprising the steps of:generating a first clock signal;compensating for unwanted belt movement along the scan path without repositioning the belt, the compensation step being comprised of:generating an edge detection signal during each laser beam scan when the laser beam encounters one edge of the photo receptor belt;synchronizing the first clock signal to the edge detection signal to produce a synchronized clock signal; andidentifying the passage of A predetermined delay interval following the production of the edge detection signal; and permitting modulation of the laser beam in accordance with the image data to begin only after passage of the predetermined time interval, thereby assuring that each scan cycle begins with the laser beam at the same position along the scan path.