Browse Prior Art Database

Ink Jet Bidirectional Printer Raster Offset Correction

IP.com Disclosure Number: IPCOM000052581D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Krieg, ML: AUTHOR [+2]

Abstract

In ink jet printers employing raster printing with a continuously movin printhead, and the raster picture elements (pels) are printed in sequence rather than simultaneously, if the printer is arranged as a bidirectional printer, there is an offset of one raster width between the left to right print line and right to left print line. This results in uneven margins detracting from the overall print quality which is achievable by the Sweet type of continuous-stream ink jet printer.

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Ink Jet Bidirectional Printer Raster Offset Correction

In ink jet printers employing raster printing with a continuously movin printhead, and the raster picture elements (pels) are printed in sequence rather than simultaneously, if the printer is arranged as a bidirectional printer, there is an offset of one raster width between the left to right print line and right to left print line. This results in uneven margins detracting from the overall print quality which is achievable by the Sweet type of continuous-stream ink jet printer.

The prior art discloses numerous schemes for compensating for the movement of a moving print head along a print line. A certain part of the prior art addresses the problem of slant correction, while other portions of the art address the problem of starting a raster with a lead time to allow the raster to reach the paper at a desired print position.

The printing scheme employed for the purpose of explanation in this article is a single continuous-drop ink jet utilizing an electrostatically deflected raster. Referring first to Fig. 1a, this figure shows left-to-right, bottom-to-top printing, the arrow 10 indicating the direction of movement of the print head. This article and the drawings disregard the lead time adjustment required and assume corrections have been made to the lead time to enable the raster to reach the paper at the location marked SOR2 (start of raster 2). It is further assumed that the print head velocity is at a maximum rate which al...