Patent EP0645246A1 successfully refreshed from Google Patents.
EP0645246A1
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EP
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Ink jet apparatus and recording method
Assignee: Canon Inc
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Filing: 1994-09-19
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Granted: —
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Expires: 2014-09-19
Abstract
Abstract When a recording head having an arrangement of plural ejection portions for ejecting ink is moved for scanning, coefficients for the calculation of blur correction are set according to the number of nozzles used during scanning (magnification), and image signals corresponding to nozzles at scanning boundaries are corrected by an amount selected according to the set coefficients. This method makes it possible to always obtain a good image in which stripes formed at such boundaries are reduced even if image recording conditions are changed.
Inventors
- 👤 Akio C/O Canon Kabushiki Kaisha Suzuki
- 👤 Nobuhiko C/O Canon Kabushiki Kaisha Ogata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:51
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/21; B41J2/2132
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
114 words
An ink jet recording apparatus for recording by using a recording head having a plurality of ejection portions arranged in an arrangement direction for ejecting an ink, said recording head being repeatedly scanned in a direction different from the arrangement direction of the ejection portions to make a plurality of scans for recording an image portion of an image, said apparatus comprising: correction means for correcting an amount of the ink which is ejected onto at least one boundary of the image portion recorded in each scan; and control means for controlling an amount of correction made by said correction means in accordance with a state of the recording head during each said scan.
Claim 2
Dependent Claim
48 words
An apparatus according to claim 1, wherein said correction means corrects the amount of correction when an image signal supplied to at least one of the ejection portions corresponding to the boundary of the image portion has a level which is at least equal to a reference level.
Claim 3
Dependent Claim
20 words
An apparatus according to claim 2, wherein said control means controls the amount of correction by changing the reference level.
Claim 4
Dependent Claim
69 words
An apparatus according to claim 1, wherein said correction means corrects an image signal corresponding to at least one said ejection portion at at least one boundary of the array of the ejection portions used during each said scan, and said control means controls the amount of correction of the image signal made by said correction means according to the state of the recording head during each said scan.
Claim 5
Dependent Claim
69 words
An apparatus according to claim 1, wherein said correction means corrects a drive signal corresponding to at least one said ejection portion at at least one boundary of the array of the ejection portions used during each said scan, and said control means controls the amount of correction of the drive signal made by said correction means according to the state of the recording head during each said scan.
Claim 6
Dependent Claim
40 words
An apparatus according to claim 1, 4 or 5, wherein said control means controls the amount of correction of the drive signal made by said correction means according to a number of the ejection portions used during each said scan.
Claim 7
Dependent Claim
44 words
An apparatus according to claim 1, 4 or 5, wherein said control means controls the amount of correction made by said correction means so that the amount of correction is reduced when the number of ejection portions used during each said scan is small.
Claim 8
Dependent Claim
40 words
An apparatus according to claim 1, 4 or 5, wherein said correction means corrects the amount of correction so that the amount of the ink ejected onto the boundary of the image portion recorded by each said scan is reduced.
Claim 9
Dependent Claim
42 words
An apparatus according to claim 1, 4 or 5, wherein said control means controls the amount of correction of the drive signal made by said correction means according to a temperature of the ink in the recording head during each said scan.
Claim 10
Dependent Claim
42 words
An apparatus according to claim 1, 4 or 5, wherein said control means controls the amount of correction of the drive signal made by said correction means according to a reduction ratio when the recording head is used in a reduction mode.
Claim 11
Independent Claim
20 words
An apparatus according to any one of claims 1-10, wherein the recording head ejects the ink by utilizing thermal energy.
Claim 12
Independent Claim
20 words
An apparatus according to any one of claims 1-11, further comprising a carriage onto which the recording head is mounted.
Claim 13
Independent Claim
29 words
An apparatus according to any one of claims 1-12, further comprising transport means for transporting a recording medium onto which the image formed by the recording head is recorded.
Claim 14
Independent Claim
31 words
An apparatus according to any one of claims 1-13, wherein said recording apparatus is used in a copying machine, or in a facsimile machine, or in a terminal for a computer.
Claim 15
Dependent Claim
116 words
An ink jet recording method for recording using a recording head having a plurality of ejection portions arranged in an arrangement direction for ejecting an ink, said recording head being repeatedly scanned in a direction different from the arrangement direction of the ejection portions to make a plurality of scans for recording an image portion of an image, said method comprising the steps of: setting a recording mode according to a state of the recording head during each said scan; and correcting an amount of the ink which is ejected onto at least one boundary of the image portion recorded in each said scan by an amount according to the recording mode that has been set.
Claim 16
Dependent Claim
34 words
A method according to claim 15, wherein, in said correcting step, the amount of the ink ejected onto the boundary of the image portion recorded by each said scan is corrected by being reduced.
Claim 17
Dependent Claim
29 words
A method according to claim 15, wherein, in said setting step, said recording mode is set according to a number of the ejection portions used during each said scan.
Claim 18
Dependent Claim
34 words
A method according to claim 17, wherein, in said correcting step, the amount of the ink ejected onto the boundary of the image portion recorded by each said scan is corrected by being reduced.
Claim 19
Dependent Claim
38 words
A method according to claim 18, wherein the amount of correction in said correcting step is reduced if the recording mode set in said setting step is such that the number of said ejection portions used is small.
Claim 20
Dependent Claim
38 words
A method according to claim 16, wherein, in said correcting step, an image signal is corrected so that the amount of the ink ejected onto the boundary of the image portion recorded by each said scan is reduced.
Claim 21
Dependent Claim
38 words
A method according to claim 16, wherein, in said correcting step, a drive signal is corrected so that the amount of the ink ejected onto the boundary of the image portion recorded by each said scan is reduced.
Claim 22
Dependent Claim
31 words
A method according to claim 15, wherein, in said setting step, said recording mode is set according to a temperature of the ink in the recording head during each said scan.
Claim 23
Dependent Claim
17 words
A method according to claim 15, wherein the recording head ejects the ink by utilizing thermal energy.
Claim 24
Dependent Claim
131 words
A recording product to which an ink is attached for recording and which is produced by an ink jet recording method using a recording head having a plurality of ejection portions arranged in an arrangement direction for ejecting the ink, said recording head being repeatedly scanned in a direction different from the arrangement direction of the ejection portions to make a plurality of scans for recording an image portion of an image, said recording method comprising the steps of: setting a recording mode according to a state of the recording head during each said scan; and correcting an amount of the ink which is ejected onto at least one boundary of the image portion recorded in each said scan by an amount according to the recording mode that has been set.
References Cited (Backward Citations)
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