Bi-directional printing with controlled hue shifts

(19)

(11)

EP 0 955 174 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	24.11.1999 Bulletin 1999/47

(43)	Date of publication A2:
	10.11.1999 Bulletin 1999/45

(21)	Application number: 98115186.3

(22)	Date of filing: 12.08.1998

(51)	International Patent Classification (IPC)⁶: B41J 19/14, B41J 2/21

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

07.05.1998 US 74549

(71)	Applicant: Hewlett-Packard Company
	Palo Alto, CA 94303 (US)

(72)	Inventor:
	Quintana, Jason Battleground, WA 98604 (US)

(74)	Representative: Liesegang, Roland, Dr.-Ing.
	FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 80801 München 80801 München (DE)

(54)	Bi-directional printing with controlled hue shifts

(57) Bi-directional color printing mode is achieved with colors applied in the same order regardless of which direction an inkjet pen is moving relative to a media sheet. For one approach a first pass of color printing onto virgin paper is performed only while the inkjet pen (14) moves in a prescribed direction (72) across the media (56). Printing a second pass then occurs while the inkjet pen moves in the opposite direction (70) across the media. The printhead prints in the same order regardless of which direction the inkjet pen moves across the media sheet.

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