Patent US4034553A successfully refreshed from Google Patents.
Patent US6007181A successfully refreshed from Google Patents.
US6007181A
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Ink-jet printing apparatus and ink-jet printing method for reducing density unevenness in a printed image due to deviation of ink application position
Assignee: Canon Inc
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Filing: 1997-10-28
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Granted: 1999-12-28
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Expires: 2017-10-28
Abstract
Abstract In a multi-scan method for printing a printing area by n (4) scans of a head and printing individual scan lines with n different ejection ports, a paper feed amount of transporting performed between the individual n scans is set to a value less than an amount of {(a length of total ejection port)/(n-1)}, and thereby close ejection ports in the ejection port arrangement in the head can be used as the n ejection ports for the individual lines, and an application position deviation between the ejection ports for individual lines due to a head mount error or the like can be reduced. As a result, unevenness of density due to deviation of dots in a scanning direction can be suppressed.
Inventors
- 👤 Kiichiro Takahashi
- 👤 Naoji Otsuka
- 👤 Kentaro Yano
- 👤 Hitoshi Nishikori
- 👤 Osamu Iwasaki
- 👤 Daigoro Kanematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:49
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/10; G06K15/102; G06K15/105; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/21; B41J2/2132
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
235 words
An ink-jet printing apparatus constructed to use a printing head arranging a plurality of ejection ports for ejecting an ink to a printing medium to perform printing, comprising: scanning means for scanning the printing head for printing in a scanning direction; paper feed means for feeding the printing medium relative to the printing head in a feeding direction different from the scanning direction; and print control means for controlling said scanning means and said paper feed means to perform printing for a scan line by performing scanning a plurality of times so as to scan the different election ports to correspond to the scan line in a complementary manner, in which n (n being an integer of 2 or more) times of scanning of the printing head and (n-1) times of feeding of the printing medium, each of which is performed between respective said n times of scanning, are performed in order to perform printing for an area of a size corresponding to a predetermined number of scan lines, and a n-th feeding of the printing medium is performed in order to perform pringting of another area; wherein a feed amount f k of each of said (n-1) times of feeding satisfies a following expression: f.sub.k <A/n where k is an integer satisfying an expression: 1≦k≦n-1, and A is obtained by multiplying a number of the plurality of ejection ports by an ejection port pitch.
Claim 2
Dependent Claim
235 words
An ink-jet printing apparatus constructed to use a printing head arranging a plurality of ejection ports for ejecting an ink to a printing medium to perform printing, comprising: scanning means for scanning the printing head for printing in a scanning direction; paper feed means for feeding the printing medium relative to the printing head in a feeding direction different from the scanning direction; and print control means for controlling said scanning means and said paper feed means to perform printing for a scan line by performing scanning a plurality of times so as to scan the different election ports to correspond to the scan line in a complementary manner, in which n (n being an integer of 2 or more) times of scanning of the printing head and (n-1) times of feeding of the printing medium, each of which is performed between respective said n times of scanning, are performed in order to perform printing for an area of a size corresponding to a predetermined number of scan lines, and a n-th feeding of the printing medium is performed in order to perform pringting of another area; wherein a feed amount f k of each of said (n-1) times of feeding satisfies a following expression: f.sub.k <A/n where k is an integer satisfying an expression: 1≦k≦n-1, and A is obtained by multiplying a number of the plurality of ejection ports by an ejection port pitch.
Claim 3
Dependent Claim
37 words
An ink-jet printing apparatus as claimed in claim 1, wherein f k has a same value for each k and a feed amount f n of said n-th feeding satisfies an expression f n =A-f k *(n-1).
Claim 4
Dependent Claim
20 words
An ink-jet printing apparatus as claimed in claim 1, wherein said f k also satisfies an expression: f k <A/2(n-1).
Claim 5
Dependent Claim
37 words
An ink-jet printing apparatus as claimed in claim 3, wherein f k has a same value for each k and a feed amount f n of said n-th feeding satisfies an expression f n =A-f k *2(n-1).
Claim 6
Dependent Claim
25 words
An ink-jet printing apparatus as claimed in claim 3, wherein a feed amount f n of said n-th feeding satisfies an expression; f n =0.
Claim 7
Dependent Claim
46 words
An ink-jet printing apparatus as claimed in claim 3, wherein f k has a same value for each k and a feed amount f n of said n-th feeding satisfies an expression f n =A-f k *2(n-1)+m, where m designates a width of a connection portion.
Claim 8
Dependent Claim
34 words
An ink-jet printing apparatus as claimed in claim 3, wherein the printing head utilizes a heat energy to produce a bubble in the ink for ejecting the ink by a pressure of said bubble.
Claim 9
Dependent Claim
201 words
An ink-jet printing method using a printing head arranging a plurality of ejection ports for ejecting an ink to a printing medium to perform printing, in which printing for a scan line is performed by performing scanning a plurality of times so as to scan the different election ports to correspond to the scan line in a complementary manner, said method comprising the steps of: performing n (n being an integer of 2 or more) times of scanning of the printing head; and performing (n-1) times of feeding of the printing medium each of which is performed between respective said n times of scanning; performing printing for an area of a size corresponding to a predetermined number of said lines together with said step for n times of scanning and said step for (n-1) times of feeding; and performing n-th feeding of the printing medium in order to perform printing of another area, wherein a feed amount f k of each of said (n-1) times of feeding satisfies a following expression; f.sub.k <A/n where k is an integer satisfying an expression: 1≦k≦n-1, and A is obtained by multiplying a number of the plurality of ejection ports by an ejection port pitch.
Claim 10
Dependent Claim
201 words
An ink-jet printing method using a printing head arranging a plurality of ejection ports for ejecting an ink to a printing medium to perform printing, in which printing for a scan line is performed by performing scanning a plurality of times so as to scan the different election ports to correspond to the scan line in a complementary manner, said method comprising the steps of: performing n (n being an integer of 2 or more) times of scanning of the printing head; and performing (n-1) times of feeding of the printing medium each of which is performed between respective said n times of scanning; performing printing for an area of a size corresponding to a predetermined number of said lines together with said step for n times of scanning and said step for (n-1) times of feeding; and performing n-th feeding of the printing medium in order to perform printing of another area, wherein a feed amount f k of each of said (n-1) times of feeding satisfies a following expression; f.sub.k <A/n where k is an integer satisfying an expression: 1≦k≦n-1, and A is obtained by multiplying a number of the plurality of ejection ports by an ejection port pitch.
Claim 11
Dependent Claim
37 words
An ink-jet printing method as claimed in claim 8, wherein f k has a same value for each k and a feed amount f n of said n-th feeding satisfies an expression f n =A-f k *(n-1).
Claim 12
Dependent Claim
20 words
An ink-jet printing method as claimed in claim 8, wherein said f k also satisfies an expression f k <A/2(n-1).
Claim 13
Dependent Claim
36 words
An ink-jet printing method as claimed in claim 10, wherein f k has a same value for each k and a feed amount f n of said n-th feeding satisfies an expression f.sub. =A-f k *2(n-1).
Claim 14
Dependent Claim
25 words
An ink-jet printing method as claimed in claim 10, wherein a feed amount f n of said n-th feeding satisfies an expression; f n =0.
Claim 15
Dependent Claim
46 words
An ink-jet printing method as claimed in claim 10, wherein f k has a same value for each k and a feed amount f n of said n-th feeding satisfies an expression f n =A-f k *2(n-1)+m, where m designates a width of a connection portion.
Claim 16
Dependent Claim
34 words
An ink-jet printing method as claimed in claim 10, wherein the printing head utilizes a heat energy to produce a bubble in the ink for ejecting the ink by a pressure of said bubble.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2002-12-27 | 2003-06-28 | 2003-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-27 | 2007-06-28 | 2007-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-27 | 2011-06-28 | 2011-12-28 | $7700.00 | Window Closed / Lapsed |