Patent EP0863004A2 successfully refreshed from Google Patents.
EP0863004A2
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Dynamic multi-pass print mode corrections to compensate for malfunctioning inkjet nozzles
Assignee: HP Inc
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Filing: 1998-03-03
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Granted: —
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Expires: 2018-03-03
Abstract
Abstract Described is a dynamic multi-pass print mode correction method which corrects for malfunctioning or inoperable ink ejection elements by substituting a fully functioning ink ejection element. The method comprises the steps of obtaining a printmask; identifying ink ejection elements which are malfunctioning; ascertaining potential replacement ink ejection elements from the printmask for the ejection elements which are malfunctioning; selecting replacement ink ejection elements from the potential replacement ink ejection elements; and modifying the printmask by removing the malfunctioning ink ejection elements from the printmask and replacing them with the selected replacement ink ejection elements.
Inventors
- 👤 Shailendra Kumar
- 👤 Javier Lagares
- 👤 Gonzalo Gaston
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:58
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/04; B41J2/045; B41J2/04501; B41J2/0451; B41J2/04561; B41J2/0458
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
A method of correcting for malfunctioning ink ejection elements in a
printing system using multiple passes over a recording medium, comprising the
steps of: obtaining (60) a standard printmask; identifying (62) ink ejection elements which are malfunctioning; ascertaining (64) from the standard printmask alternative replacement ink
ejection elements for the ejection elements which are malfunctioning; selecting (66) replacement ink ejection elements from the alternative
replacement ink ejection elements; and modifying (68) the standard printmask by removing the malfunctioning ink
ejection elements from the printmask and replacing them with the selected
replacement ink ejection elements to create a modified printmask.
Claim 2
Dependent Claim
42 words
The method of claim 1 wherein said obtaining step (60) includes
obtaining data specifying a pixel grid of rows and columns, the pass used to print
a particular pixel location and the ink ejection element used to print a particular
pixel location.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said identifying step (62) includes
using an acoustical drop ejection detection to identify malfunctioning ink ejection
elements.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein said identifying step (62) includes
using an optical drop ejection detect to identify malfunctioning ink ejection
elements.
Claim 5
Dependent Claim
29 words
The method of claim 1 wherein said ascertaining step (64) includes
obtaining data specifying an alternative ink ejection element and an alternative pass to print a
row of pixels.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein said ascertaining step (64) includes
obtaining data from a printer.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein said ascertaining step (64) includes
obtaining data from a printer driver.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein said selecting step (66) includes
selecting a replacement ink ejection element which would be used in an non-adjacent
pass.
Claim 9
Dependent Claim
29 words
The method of claim 1 wherein said selecting step (66) includes
selecting a replacement ink ejection element which is located in the middle an
array of ink ejection elements.
Claim 10
Dependent Claim
17 words
The method of claim 1 wherein said steps (60 - 68) are performed
for the entire printmask.
Claim 11
Dependent Claim
18 words
The method of claim 1 wherein said steps (60-68) are performed
for the printmask individually for each pass.
Claim 12
Independent Claim
143 words
A method of printing using multiple scanning passes over a
recording medium and correcting for malfunctioning ink ejection elements,
comprising the steps of: obtaining (60) a standard printmask defining a pixel grid of rows and
columns and the ink ejection element which ejects on a particular row and column
of the pixel grid in a particular pass; identifying (62) ink ejection elements which are malfunctioning; ascertaining (64) alternative ink ejection elements for the ejection elements
which are malfunctioning; selecting (66) replacement ink ejection elements from the alternative
replacement ink ejection elements; modifying (68) the standard printmask by removing the malfunctioning ink
ejection elements from the printmask and replacing them with the selected
replacement ink ejection elements to create a modified printmask; and ejecting ink drops onto the recording medium in multiple scanning passes
over the recording medium in accordance with the modified printmask.
References Cited (Backward Citations)
US4313684A
Cited
US4490728A
Cited
US4963882A
Cited
US4963882B1
Cited
US4922270A
Cited
US4965593A
Cited
US5434430A
Cited
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