Bidirectional ink jet printing

Details Bidirectional ink jet printing Bidirectional ink jet printing

1992-06-15

1994-11-29

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 37, 395101, 400323, B41J 207

Patent

active

053694287

ABSTRACT:
Ink jet print quality is improved and higher pen speed permitted by a bidirectional printing protocol. According to the new protocol, each individual character to be printed is first partitioned into a leading portion and a trailing portion. The trailing portion includes all trailing edge bits. Only the leading portion is printed on a forward pass of the ink jet pen. The trailing portion is printed on a reverse pass of the pen, so that trailing edge ink drops are instead printed as leading edge ink drops. As a result, satellite ink drops are directed toward the center of the character, where they are covered by primary ink drops, thereby minimizing character edge roughness associated with exposed satellite ink drops.

REFERENCES:
patent: 4969758 (1990-01-01), Sanders, Jr. et al.

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