US5729259A
Expired / Lapsed
US
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Random jet recording apparatus and method by thick and thin inks
Assignee: Canon Inc
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Filing: 1994-05-31
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Granted: 1998-03-17
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Expires: 2014-05-31
Abstract
Abstract When an image to be recorded has a density to be recorded by using thin ink of thick and thin inks, areas of dots recording from ink discharge ports arranged normally to a main scan direction of a recording head are irregularly varied so that a variation of density in a low density area is reduced.
Inventors
- 👤 Fumihiro Gotoh
- 👤 Hiromitsu Hirabayashi
- 👤 Noribumi Koitabashi
- 👤 Yuji Akiyama
- 👤 Hitoshi Sugimoto
- 👤 Miyuki Matsubara
- 👤 Hidehiko Kanda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:57
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40087; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/205; B41J2/2056
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
184 words
An ink jet recording apparatus for recording an image formed from a plurality of pixels by discharging ink onto a recording medium from a recording head for discharging inks of a same color system but different densities, including an ink of a lowest density, from a plurality of discharge ports disposed in an arrangement direction, comprising: scan means for scanning said recording head in a scan direction relative to said recording medium in a record mode; and control means for randomly controlling sizes of dots recorded on said recording medium by the ink discharged by said recording head as said recording head is scanned by said scan means when the image is recorded using at least the ink of the lowest density of the inks having different densities, said control means randomly changing, in the relative scan direction, a size area of a respective dot formed on said recording medium by the ink of the lowest density discharged from said recording head in units of one drop for each pixel, wherein the image is recorded by performing a single ink discharge for each pixel.
Claim 2
Dependent Claim
184 words
An ink jet recording apparatus for recording an image formed from a plurality of pixels by discharging ink onto a recording medium from a recording head for discharging inks of a same color system but different densities, including an ink of a lowest density, from a plurality of discharge ports disposed in an arrangement direction, comprising: scan means for scanning said recording head in a scan direction relative to said recording medium in a record mode; and control means for randomly controlling sizes of dots recorded on said recording medium by the ink discharged by said recording head as said recording head is scanned by said scan means when the image is recorded using at least the ink of the lowest density of the inks having different densities, said control means randomly changing, in the relative scan direction, a size area of a respective dot formed on said recording medium by the ink of the lowest density discharged from said recording head in units of one drop for each pixel, wherein the image is recorded by performing a single ink discharge for each pixel.
Claim 3
Dependent Claim
38 words
An ink jet recording apparatus according to claim 1 wherein said control means controls the sizes of dots recorded on said recording medium such that the sizes are equal along the direction of arrangement of the discharge ports.
Claim 4
Dependent Claim
26 words
An ink jet recording apparatus according to claim 1 wherein said recording head creates bubbles in the ink by using thermal energy to eject the ink.
Claim 5
Dependent Claim
176 words
An ink jet recording method for recording an image formed from a plurality of pixels by discharging ink onto a recording medium, comprising the steps of: providing a recording head for discharging inks of a same color system but different densities, including an ink of a lowest density, from a plurality of discharge ports disposed in an arrangement direction; scanning said recording head in a scan direction relative to said recording medium in a record mode; and randomly controlling sizes of dots recorded on said recording medium by the inks discharged from said recording head as said recording head is scanned when the image is recorded using at least the ink of the lowest density of the inks of different densities, said controlling randomly changing, in the relative scan direction, a size of a respective dot formed on said recording medium by the ink of the lowest density discharged from said recording head in units of one drop for each pixel, wherein the image is recorded by performing a single ink discharge for each said pixel.
Claim 6
Dependent Claim
176 words
An ink jet recording method for recording an image formed from a plurality of pixels by discharging ink onto a recording medium, comprising the steps of: providing a recording head for discharging inks of a same color system but different densities, including an ink of a lowest density, from a plurality of discharge ports disposed in an arrangement direction; scanning said recording head in a scan direction relative to said recording medium in a record mode; and randomly controlling sizes of dots recorded on said recording medium by the inks discharged from said recording head as said recording head is scanned when the image is recorded using at least the ink of the lowest density of the inks of different densities, said controlling randomly changing, in the relative scan direction, a size of a respective dot formed on said recording medium by the ink of the lowest density discharged from said recording head in units of one drop for each pixel, wherein the image is recorded by performing a single ink discharge for each said pixel.
Claim 7
Dependent Claim
38 words
An ink jet recording method according to claim 4 wherein said controlling step controls the sizes of dots recorded on said recording medium such that the sizes are equal along the direction of arrangement of the discharge ports.
Claim 8
Dependent Claim
128 words
An ink jet recording apparatus for recording an image formed from a plurality of pixels by using a recording head having a plurality of discharge ports for discharging a thick ink and a thin ink, respectively, comprising: scan means for scanning said recording head relative to a recording medium in a relative scan direction; and control means for randomly controlling a size of the thin ink discharged from said recording head when the image is recorded using the thin ink, said control means randomly changing, in the relative scan direction, a size of a respective droplet of the thin ink discharged from said recording head in units of one drop for each pixel, wherein the image is recorded by performing a single ink discharge for each said pixel.
Claim 9
Dependent Claim
128 words
An ink jet recording apparatus for recording an image formed from a plurality of pixels by using a recording head having a plurality of discharge ports for discharging a thick ink and a thin ink, respectively, comprising: scan means for scanning said recording head relative to a recording medium in a relative scan direction; and control means for randomly controlling a size of the thin ink discharged from said recording head when the image is recorded using the thin ink, said control means randomly changing, in the relative scan direction, a size of a respective droplet of the thin ink discharged from said recording head in units of one drop for each pixel, wherein the image is recorded by performing a single ink discharge for each said pixel.
Claim 10
Dependent Claim
18 words
An ink jet recording apparatus according to claim 6 wherein said discharge ports are arranged in a line.
Claim 11
Dependent Claim
29 words
An ink jet recording apparatus according to claim 7 wherein said recording head includes a plurality of heads each having a plurality of discharge ports arranged in a line.
Claim 12
Dependent Claim
21 words
An ink jet recording apparatus according to claim 8 wherein said plurality of heads correspond to a plurality of different colors.
Claim 13
Dependent Claim
20 words
An ink jet recording apparatus according to claim 6 wherein said recording head discharges the ink by using thermal energy.
Claim 14
Dependent Claim
18 words
An ink jet recording apparatus according to claim 6 further comprising a carriage for supporting said recording head.
Claim 15
Dependent Claim
24 words
An ink jet recording apparatus according to claim 6 further comprising transport means for transporting the recording medium recorded upon by said recording head.
Claim 16
Dependent Claim
19 words
An ink jet recording apparatus according to claim 6 wherein said recording apparatus is applied to a copying apparatus.
Claim 17
Dependent Claim
19 words
An ink jet recording apparatus according to claim 6 wherein said recording apparatus is applied to a facsimile apparatus.
Claim 18
Dependent Claim
19 words
An ink jet recording apparatus according to claim 6 wherein said recording apparatus is applied to a computer terminal.
Claim 19
Independent Claim
167 words
A method for reducing variation in density on a low density area of an image formed from a plurality of pixels on a recording medium, comprising the steps of: providing a recording head for discharging inks of the same color system but different densities from a plurality of discharge ports; relatively scanning said recording head in a scan direction to said recording medium in a record mode; and randomly controlling sizes of dots recorded on said recording medium by the inks discharged from said recording head as said recording head is scanned when the image is recorded using at least the ink of the lowest density of the inks of different densities, said controlling randomly changing, in the relative scan direction, a size of a respective dot formed on said recording medium by the ink of the lowest density discharged from recording head in units of one drop for each said pixel, wherein the image is recorded by performing a single ink discharge for each said pixel.
Claim 20
Independent Claim
167 words
A method for reducing variation in density on a low density area of an image formed from a plurality of pixels on a recording medium, comprising the steps of: providing a recording head for discharging inks of the same color system but different densities from a plurality of discharge ports; relatively scanning said recording head in a scan direction to said recording medium in a record mode; and randomly controlling sizes of dots recorded on said recording medium by the inks discharged from said recording head as said recording head is scanned when the image is recorded using at least the ink of the lowest density of the inks of different densities, said controlling randomly changing, in the relative scan direction, a size of a respective dot formed on said recording medium by the ink of the lowest density discharged from recording head in units of one drop for each said pixel, wherein the image is recorded by performing a single ink discharge for each said pixel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-16 | 2001-09-15 | 2002-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-16 | 2005-09-15 | 2006-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-16 | 2009-09-15 | 2010-03-17 | $7700.00 | Window Closed / Lapsed |