Apparatus and method for providing accurate layer registration f

Details Apparatus and method for providing accurate layer registration f Apparatus and method for providing accurate layer registration f

1992-09-18

1993-11-23

Reinhart, Mark J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

346108, H04N 121

Patent

active

052649431

ABSTRACT:
An apparatus and method for providing accurate layer registration for multiple layer electronic printing systems discloses a means and a method of reducing the positional scan-to-scan error in a multiple layer electronic printing systems, typically multi-beam laser raster output scanners, in which accurate layer registration is critical. The method comprises determination of a time delay between page sync signal and start-of-scan signal, using this delay to determine delay dependent offset factor called the phase registration parameter, and correctively mapping image data to proper output channels based on the phase registration parameter and the laser number. The phase registration parameter must be determined at the beginning of each scan layer and the offset factors must be re-adjusted based on the new phase delay.

REFERENCES:
patent: 4494865 (1985-01-01), Andrus et al.
patent: 4978970 (1990-12-01), Okazaki
patent: 5179463 (1993-01-01), Kramer

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