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Improved Font Design for Matrix Addressed Printing

IP.com Disclosure Number: IPCOM000048059D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Countryman, GP: AUTHOR [+5]

Abstract

A nonimpact printer is described which prints with arbitrary resolution in the vertical direction and with means to control the turn ON and turn OFF of the printing means as the printing means is moved in the horizontal direction to produce optimum horizontal resolution.

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Improved Font Design for Matrix Addressed Printing

A nonimpact printer is described which prints with arbitrary resolution in the vertical direction and with means to control the turn ON and turn OFF of the printing means as the printing means is moved in the horizontal direction to produce optimum horizontal resolution.

Conventional font design for matrix printing yields a staircasing effect on diagonal lines, as shown in the left figure, because the printed marks are placed next to each other in a square matrix.

An improved font design utilizes the normal vertical resolution but has the printed marks placed at an optimum position in the horizontal direction so that the apparent horizontal resolution is much finer than the pel (picture element) size of the printed mark, as shown in the right figure. This font can be printed in a linear raster scan printing means by controlling the timing of turn ON and turn OFF of the printing means during the linear scan, with timing controllable to a smaller horizontal increment than the pel size of the printing means. As can be seen from the figures, the improved font design shows considerably less staircasing effect than the conventional font design.

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