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公开(公告)号：DE69632657T2
公开(公告)日：2005-06-16
申请号：DE69632657
申请日：1996-03-07
Applicant: XEROX CORP
Inventor： BECERRA JUAN J , TELLIER THOMAS A , COURTNEY THOMAS P , WATROBSKI THOMAS E , LADONNA RICHARD L , WYBLE THOMAS J
Abstract: A liquid recording apparatus ejects droplets of liquid onto a recording medium. The apparatus has multiple liquid emitters (46) whose emissions are activated (51,66) by multiple power pulses. The power pulses are controlled to maximize the number of emitters which can be simultaneously energized while keeping the instantaneous power usage within prescribed boundaries. The multiple emitters are organized into banks of emitters (96) whose numbers are small enough that all emitters within a bank can receive a correct level of power simultaneously without exceeding capacity of a shared power source. A circuit (67) interleaves the power pulses to the emitters so that no bank of emitters are receiving power at the same instant of time. In this fashion, the recording apparatus can achieve maximum recording speed while employing the smallest capacity power source (66) which is practicable.
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公开(公告)号：BR9706850A
公开(公告)日：1999-04-06
申请号：BR9706850
申请日：1997-06-20
Applicant: XEROX CORP
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公开(公告)号：DE69621054T2
公开(公告)日：2002-09-26
申请号：DE69621054
申请日：1996-01-03
Applicant: XEROX CORP
Inventor： KLASSEN R VICTOR , COURTNEY THOMAS P , MORGANA STEPHEN C
Abstract: To print an image having a 600 dpi (24 dots/mm) resolution along the horizontal axis with an ink jet printer that has a 300 dpi (12 dots/mm) resolution, the method alternately examines (s104, s106) the odd and even numbered pixel rows of the image (200; Fig. 1). Odd-numbered rows (9, 11, 13, 15) are examined in a left-to-right manner while even-numbered rows (10, 12, 14, 16) are examined in a right-to-left manner. In odd-numbered rows the even numbered pixels are deleted (s104). In the even-numbered rows, the even numbered pixels are deleted (s106) starting from the right-most pixel (Fig. 5). After deleting the respective pixels, ink drops are fired from the ink jet printer at areas corresponding to the remaining ON pixels. This visibly reproduces the image at the 600 dpi (24 dots/mm) resolution.
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公开(公告)号：DE69616604D1
公开(公告)日：2001-12-13
申请号：DE69616604
申请日：1996-01-03
Applicant: XEROX CORP
Inventor： COURTNEY THOMAS P
Abstract: The printing of an image by a thermal ink jet printer (10) is controlled by a central processing unit (12) based on an internal temperature sensed by temperature sensor (16) of the printer adjacent the printhead (14) and the density of the printed image determined by density determiner 20 in the central processing unit. Prior to printing, the temperature of the printhead is estimated, and the density of the image is determined from stored print data in memory (18) in the central processing unit. Based on the temperature and density, either a single-pass 100% coverage print mode or a double-pass checkerboard print mode is selected. Also, based on the temperature and density, the printhead droplet ejection rate is set. Such control provides a printed image with high quality and prevents misfiring of the ink jets when temperatures and density are high.
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公开(公告)号：DE69622441T2
公开(公告)日：2002-11-28
申请号：DE69622441
申请日：1996-01-03
Applicant: XEROX CORP
Inventor： COURTNEY THOMAS P
Abstract: The printing operation of an ink jet printer (12) is controlled (22) based on the density of the image to be printed. Using the density (24), a required drying time for each swath of printed matter is determined based on the image density, and hence a suitable rate of print ejection (28). Also using the density, a maximum print frequency of firing the ink jets is determined (26). The density is determined by filtering stored print data by dividing the print data into blocks and determining a maximum number of ON pixels in a block. Such filtering enables clusters of ON pixels to be detected thus providing a more accurate determination of the density.
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Patent Agency Ranking
公开(公告)号：DE69621054D1
公开(公告)日：2002-06-13
申请号：DE69621054
申请日：1996-01-03
Applicant: XEROX CORP
Inventor： KLASSEN R VICTOR , COURTNEY THOMAS P , MORGANA STEPHEN C
Abstract: To print an image having a 600 dpi (24 dots/mm) resolution along the horizontal axis with an ink jet printer that has a 300 dpi (12 dots/mm) resolution, the method alternately examines (s104, s106) the odd and even numbered pixel rows of the image (200; Fig. 1). Odd-numbered rows (9, 11, 13, 15) are examined in a left-to-right manner while even-numbered rows (10, 12, 14, 16) are examined in a right-to-left manner. In odd-numbered rows the even numbered pixels are deleted (s104). In the even-numbered rows, the even numbered pixels are deleted (s106) starting from the right-most pixel (Fig. 5). After deleting the respective pixels, ink drops are fired from the ink jet printer at areas corresponding to the remaining ON pixels. This visibly reproduces the image at the 600 dpi (24 dots/mm) resolution.
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公开(公告)号：CA2168994A1
公开(公告)日：1996-09-09
申请号：CA2168994
申请日：1996-02-07
Applicant: XEROX CORP
Inventor： BECERRA JUAN J , COURTNEY THOMAS P , LADONNA RICHARD L , TELLIER THOMAS A , WATROBSKI THOMAS E , WYBLE THOMAS J
Abstract: A liquid recording apparatus ejects droplets of liquid onto a recording medium. The apparatus has multiple liquid emitters (46) whose emissions are activated (51,66) by multiple power pulses. The power pulses are controlled to maximize the number of emitters which can be simultaneously energized while keeping the instantaneous power usage within prescribed boundaries. The multiple emitters are organized into banks of emitters (96) whose numbers are small enough that all emitters within a bank can receive a correct level of power simultaneously without exceeding capacity of a shared power source. A circuit (67) interleaves the power pulses to the emitters so that no bank of emitters are receiving power at the same instant of time. In this fashion, the recording apparatus can achieve maximum recording speed while employing the smallest capacity power source (66) which is practicable.
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公开(公告)号：DE69616604T2
公开(公告)日：2002-05-16
申请号：DE69616604
申请日：1996-01-03
Applicant: XEROX CORP
Inventor： COURTNEY THOMAS P
Abstract: The printing of an image by a thermal ink jet printer (10) is controlled by a central processing unit (12) based on an internal temperature sensed by temperature sensor (16) of the printer adjacent the printhead (14) and the density of the printed image determined by density determiner 20 in the central processing unit. Prior to printing, the temperature of the printhead is estimated, and the density of the image is determined from stored print data in memory (18) in the central processing unit. Based on the temperature and density, either a single-pass 100% coverage print mode or a double-pass checkerboard print mode is selected. Also, based on the temperature and density, the printhead droplet ejection rate is set. Such control provides a printed image with high quality and prevents misfiring of the ink jets when temperatures and density are high.
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公开(公告)号：BR9600007A
公开(公告)日：1998-01-21
申请号：BR9600007
申请日：1996-01-02
Applicant: XEROX CORP
Inventor： COURTNEY THOMAS P
Abstract: The printing operation of an ink jet printer (12) is controlled (22) based on the density of the image to be printed. Using the density (24), a required drying time for each swath of printed matter is determined based on the image density, and hence a suitable rate of print ejection (28). Also using the density, a maximum print frequency of firing the ink jets is determined (26). The density is determined by filtering stored print data by dividing the print data into blocks and determining a maximum number of ON pixels in a block. Such filtering enables clusters of ON pixels to be detected thus providing a more accurate determination of the density.
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公开(公告)号：BR9600953A
公开(公告)日：1997-12-30
申请号：BR9600953
申请日：1996-03-07
Applicant: XEROX CORP
Inventor： BECERRA JUAN J , COURTNEY THOMAS P , LADONNA RICHARD L , TELLIER THOMAS A , WATROBSKI THOMAS E , WYBLE THOMAS J
Abstract: A liquid recording apparatus ejects droplets of liquid onto a recording medium. The apparatus has multiple liquid emitters (46) whose emissions are activated (51,66) by multiple power pulses. The power pulses are controlled to maximize the number of emitters which can be simultaneously energized while keeping the instantaneous power usage within prescribed boundaries. The multiple emitters are organized into banks of emitters (96) whose numbers are small enough that all emitters within a bank can receive a correct level of power simultaneously without exceeding capacity of a shared power source. A circuit (67) interleaves the power pulses to the emitters so that no bank of emitters are receiving power at the same instant of time. In this fashion, the recording apparatus can achieve maximum recording speed while employing the smallest capacity power source (66) which is practicable.
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