Browse Prior Art Database

ANY RESOLUTION PRINTER

IP.com Disclosure Number: IPCOM000026874D
Original Publication Date: 1994-Feb-28
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 73K

Publishing Venue

Xerox Disclosure Journal

Abstract

The following disclosure describes a method which replicates a bit map by an integer magnification in combination with existing servo control technology to produce an "any resolution printer", thereby avoiding moire patterns. The conversion of binary bit maps from one resolution to another is a dificult process. Significant progress has been made using error diffusion techniques, however, low level moire persists in halftones and one-on one-off ladders.

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XEROX DISCLOSURE JOURNAL

ANY RESOLUTION PRINTER Proposed Classification Louis D. Mailloux U.S. C1.358/448

Int. C1. H04M 11/00

The following disclosure describes a method which replicates a bit map by an integer magnification in combination with existing servo control technology to produce an "any resolution printer", thereby avoiding moire patterns. The conversion of binary bit maps from one resolution to another is a dificult process. Significant progress has been made using error diffusion techniques, however, low level moire persists in halftones and one-on one-off ladders.

If binary bit maps are converted in magnification by integer multiples moire does not occur. It is, therefore, proposed that replication by integer multiples may be used in combination with servo control technology to produce an any resolution printer. The Page Description Language (PDL) for example Interpress, contains the transformation description that would set a printer to an appropriate resolution for a page or document.

The polygon motor which drives the Raster Output Scanner within the printer, can be designed to convert a 2 to 1 range, for example, a 300 spots per inch to 600 spots per inch conversion. As an alternative, assuming scanning rates greater than twice the input scan density cannot be achieved, multibeam lasers may be employed so as to require a motor speed range of less than 2 to 1. The pixel clock is easily designed to cover a 2 to 1 range. Fast scan, high addressabili...