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Browse Prior Art Database

Raster Printer

IP.com Disclosure Number: IPCOM000087703D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 92K

Publishing Venue

IBM

Related People

McCurry, RE: AUTHOR

Abstract

A magnetic ink jet printer (Fig. 1) comprises a drop generator 10 for projecting a single continuous stream of ferrofluid ink drops 11 toward a print medium 12. A horizontal selector 13, energized by data pulses applied to the winding 14, diverts drops 11 not used for printing to a gutter 15. A vertical deflector 16 is energized by scan generator 17 which applies a scanning signal to winding 18 to deflect all drops vertically, as the paper 12 and the jet components are moved relatively in a horizontal direction.

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Raster Printer

A magnetic ink jet printer (Fig. 1) comprises a drop generator 10 for projecting a single continuous stream of ferrofluid ink drops 11 toward a print medium 12. A horizontal selector 13, energized by data pulses applied to the winding 14, diverts drops 11 not used for printing to a gutter 15. A vertical deflector 16 is energized by scan generator 17 which applies a scanning signal to winding 18 to deflect all drops vertically, as the paper 12 and the jet components are moved relatively in a horizontal direction.

It is desirable in some applications to be able to print either noncoded information (NCI) or alphanumerically. In that event, the vertical deflection for NCI printing must be great enough to cover the entire print line height so that no gaps appear between lines, while, for character printing, the vertical deflection of the drops by deflector 16 may be less, since the actual character height is substantially less than the total print line height. For example, in NCI printing the number of dot positions in a vertical stroke night be 16, while for alphanumeric characters the number of dot positions could be 9 (Fig. 2).

Basically, the conversion of the magnetic ink jet print from NCI to alphanumeric involves changing the height of the raster scan signal applied by the scan generator 17 to the winding 18 of deflector 16, while modifying the data pulse train applied to winding 14 of selector 13 to discard drops to the gutter 15 accordingly. This is done simply by supplying a DC bias to the winding 18 at the app...