EP0955174A2
Expired / Lapsed
EP
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Bi-directional printing with controlled hue shifts
Assignee: HP Inc
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Filing: 1998-08-12
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Granted: —
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Expires: 2018-08-12
Abstract
Abstract 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.
Inventors
- 👤 Jason Quintana
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:37
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/21; B41J2/2132; B41J19/00; B41J19/14; B41J19/142; B41J19/147
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
153 words
A method for bi-directional inkjet color printing onto a media (56), comprising the steps of: moving an ink drop ejection source (24) in a first direction (72) relative to the media; ejecting ink drops in a first prescribed color order of hierarchy (KCMY) onto a virgin area of the media while moving the ink drop ejection source in the first direction relative to the media for all printing in which the ink drop source moves in the first direction relative to the media; moving the ink drop ejection source in a second direction (70) relative to the media; and ejecting ink drops in a second prescribed color order or hierarchy (YMCK) while moving the ink drop ejection source in the second direction relative to the media for all printing in which the ink drop source moves in the second direction relative to the media, wherein the second direction differs from the first direction.
Claim 2
Independent Claim
185 words
A method for bi-directional inkjet color printing onto a media (56), comprising the steps of: moving an ink drop ejection source (124) in a first direction (72) relative to the media; ejecting ink drops in a first prescribed color order of hierarchy (KCMY) onto the media while moving the ink drop ejection source in the first direction relative to the media; feeding the media in one direction of either a forward direction or a backward direction relative to the ink drop ejection source after the step of ejecting in a first prescribed order; moving the ink drop ejection source in a second direction (70) relative to the media; ejecting ink drops in a second prescribed color order or hierarchy (YMCK) while moving the ink drop ejection source in the second direction relative to the media, wherein the second direction differs from the first direction; and feeding the media in another direction of either the forward or the backward direction relative to the ink drop ejection source after the step of ejecting in a first prescribed order, wherein said another direction is opposite said one direction.
Claim 3
Dependent Claim
24 words
The method of claim 2, wherein ink drops are ejected onto a virgin area of the media only in the first prescribed order (KCMY).
Claim 4
Dependent Claim
76 words
The method of claim 2 or 3, wherein the step of feeding the media in one direction (72) comprises feeding the media one of either one-half a line feed or one and on-half a line feed in said one direction, and the step of feeding the media in another direction (70) comprises feeding the media the other of either said one-half a line feed or said one and one-half a line feed in said another direction.
Claim 5
Dependent Claim
80 words
The method of claim 2, 3 or 4, wherein the steps of moving in the first direction, ejecting in the first prescribed order, feeding in one direction, moving in the second direction, ejecting in the second prescribed order, and feeding in the another direction are repeated in sequence as iterations for an entire print job for the media, and wherein said one direction is the same for each iteration, and wherein said another direction is the same for each iteration.
Claim 6
Dependent Claim
23 words
The method of claim 1, 2, 3, 4 or 5, wherein the second prescribed color order differs from the first prescribed color order.
Claim 7
Dependent Claim
156 words
A color inkjet printing apparatus (10) for printing to a media (56), the apparatus comprising: a plurality of color ink reservoirs (16-22), each reservoir storing ink of a different color; an inkjet printhead (124) having a plurality of printing elements (42-48) arranged in a plurality of rows (34-40), each one of the plurality of rows dedicated for ejecting ink of a prescribed color, wherein there are at least two rows of the plurality of rows are dedicated to each color, and wherein the plurality of rows are symmetrically located on the printhead in terms of the color of ink ejected; and a carriage (12) which moves the inkjet printhead in alternating first and second directions (70,72) across the media to print to the media, wherein the printhead ejects ink in a common color order of hierarchy (KCMYYMCK) regardless of whether the printhead is moving in the first direction or the second direction relative to the media.
Claim 8
Dependent Claim
221 words
A color inkjet printing apparatus (10) for printing to a media (56), the apparatus comprising: a plurality of color ink reservoirs (16-22), each reservoir storing ink of a different color; an inkjet printhead (24) having a plurality of printing elements (42-48) arranged in a plurality of rows (34-40), each one of the plurality of rows dedicated for ejecting ink of a prescribed color; a carriage (12) which moves the inkjet printhead in alternating first and second directions (70,72) across the media to print to the media, causing ink to be received onto the media in a first prescribed color order of hierarchy (KCMY) while the carriage moves in the first direction (72) and ink to be received onto the media in a second prescribed color order of hierarchy (YMCK) opposite the first prescribed order while the carriage moves in the second direction (70); drive means (62) for moving the media relative to the carriage; means (64) for controlling the drive means to feed the media in one direction of either a forward direction or a backward direction relative to the carriage while the carriage moves in said first direction and for controlling the drive means to feed the media in another direction of the forward direction or the backward direction relative to carriage while the carriage moves in said second direction.
Claim 9
Dependent Claim
24 words
The apparatus of claim 8, wherein ink drops are ejected onto a virgin area of the media only in the first prescribed color order.
Claim 10
Dependent Claim
98 words
The apparatus of claim 8 or 9, wherein multiple pass printing with 'n' passes is performed, and wherein the control means (64) comprises: means for controlling the drive means to feed the media at least one line feed in said one direction; and means for controlling the drive means to feed the media at least (2/n) - 1 line feeds in said another direction; and wherein ink drops are ejected onto a virgin area of the media during all printing to the media one of only the first prescribed color order or only the second prescribed color order.
References Cited (Backward Citations)
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