Raster Overlap in All Points Addressable Printing
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
In all-points-addressable (APA) printer applications, the printing apparatus, for example, an ink jet printer of the continuous-stream-type or a drop-on-demand type printer, it is necessary that the printer be able to print arbitrarily long strokes on an 8 1/2 X 11 inch page. The printed strokes are horizontal, vertical or diagonal either with straight lines or curved lines. In this connection, it is desirable that the printer be able to leave large areas white as well as black and including pseudo-half-tones or grays. In the IBM 6640 document printer, the "print element" is a 40-pel high raster which at 240 pels per inch prints up to 1/6 of an inch high image corresponding to the standard typewriter indexing of 1/6 of an inch.