Recording apparatus and recording method

Patent metadata

Field	Value
Publication number	US-10384444-B2
Application number	US-201815945510-A
Country	US
Kind code	B2
Filing date	Apr 4, 2018
Priority date	Apr 28, 2017
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A recording apparatus includes a recording head including a plurality of ink discharge ports arranged in a predetermined direction, and a complementing unit configured to, according to discharge defect information identifying a defective discharge port at which a discharge defect has occurred among the plurality of ink discharge ports, determine to cause provision of complementary ink to be conducted from a different discharge port configured to discharge the ink at a different position from the identified defective discharge port, wherein the complementing unit determines to use a discharge port configured to provide the ink at a position on one side that is one of positions adjacent in the predetermined direction to a position at which the at least one discharge port provides the ink as the different discharge port for the discharge port identified as the defective discharge port.

First claim

What is claimed is:

1. A recording apparatus comprising:
a recording head including a plurality of ink discharge ports arranged in a predetermined direction;
a determination unit configured to, according to tone data indicating a tone of an image to be formed on a recording medium, determine recording data indicating whether or not to discharge ink at a position corresponding to each of pixels forming the image on the recording medium;
a complementing unit configured to generate complementary data based on the recording data, according to discharge defect information identifying a defective discharge port at which a discharge defect has occurred among the plurality of ink discharge ports, for causing a different discharge port, from the identified defective discharge port for discharging the ink to a different position from a position corresponding to the defective discharge port, to discharge ink; and a control unit configured to control a recording operation so as to move the recording head and the recording medium relative to each other in a direction intersecting the predetermined direction and discharge ink from the recording head onto the recording medium according to the complementary data,
wherein, if at least one discharge port among the plurality of ink discharge ports is identified as the defective discharge port, the complementing unit generates the complementary data for causing a discharge port, configured to discharge at a complementing position that is one predetermined position of positions adjacent, on both side in the predetermined direction, to a position at which the at least one discharge port discharge the ink, to discharge ink, and
wherein, if a tone value indicated by the tone data indicates a tone value half as large as a maximum tone value, the determination unit determines not to discharge the ink at more than half of complementing positions, each of which is the complementing position for the at least one discharge port.

2. The recording apparatus according to claim 1 , wherein the complementing unit causes the discharge port at the position on the one side that is the one of the positions adjacent to the defective discharge port in the predetermined direction to discharge the complementary data to a position at which the defective discharge port should discharge the ink.

3. The recording apparatus according to claim 1 , wherein, with respect to each of the plurality of ink discharge ports, if this discharge port is identified as the defective discharge port, the complementing unit sets the discharge port configured to discharge the ink at the position on the one side that is the one of the positions adjacent in the predetermined direction to the position at which the at least one discharge port discharges the ink, as the different discharge port.

4. The recording apparatus according to claim 1 , wherein, if the tone value indicated by the tone data indicates the tone value half as large as the maximum tone value, the determination unit determines not to discharge the ink at more than half of the complementing positions, each of which is the complementing position for each of the discharge ports.

5. The recording apparatus according to claim 1 , wherein, if the tone value indicated by the tone data indicates the tone value half as large as the maximum tone value, the determination unit determines not to discharge the ink at all of the complementing positions.

6. The recording apparatus according to claim 5 , wherein, if the tone value indicated by the tone data indicates the tone value half as large as the maximum tone value, the determination unit determines not to discharge the ink at all of the positions adjacent in the predetermined direction to the position at which the defective discharge port should have discharged the ink originally when this discharge port is identified as the defective discharge port.

7. The recording apparatus according to claim 2 , wherein the complementing position for the discharge port identified as the defective discharge port is a position at which the ink is discharged by a discharge port adjacent on the same side that is one of the discharge ports adjacent to the defective discharge port in the predetermined direction.

8. The recording apparatus according to claim 7 , wherein the complementing position for each of the plurality of ink discharge ports is a position adjacent on the same one side that is one of the positions adjacent in the predetermined direction to the position at which the defective discharge port should have discharged the ink originally when this discharge port is identified as the defective discharge port.

9. The recording apparatus according to claim 1 , wherein the determination unit determines whether or not to discharge the ink at the corresponding position for each of the pixels by using, according to the tone value allocated to a pixel group, an index pattern defining the number of pixel(s) and a position of a pixel at which the discharge of the ink is set in this pixel group, and employing the index pattern individually with respect to each of the pixels.

10. The recording apparatus according to claim 9 , wherein the discharge of the ink is not set at more than half of the complementing positions in the index pattern.

11. The recording apparatus according to claim 1 , wherein the complementing unit determines to use a position adjacent on a first side in the predetermined direction to the position at which the ink should be discharged by the defective discharge port as the position at which the discharge of ink is caused to be conducted until a predetermined timing, and determines to use a position adjacent on a second side opposite from the first side in the predetermined direction to the position at which the ink should be discharged by the defective discharge port as the position at which the discharge of ink is caused to be conducted after the predetermined timing.

12. A recording apparatus comprising:
a recording head including plurality of ink discharge ports arranged in a predetermined direction;
a determination unit configured to, according to tone data indicating a tone of an image to be formed on a recording medium, determine recording data indicating whether or not to discharge ink at a position corresponding to each of pixels forming the image on the recording medium;
a complementing unit configured to generate complementary data for based on the recording data for causing a complementary discharge port to discharge ink based on discharge defect information identifying a defective discharge port at which a discharge defect has occurred among the plurality of discharge ports; and
a control unit configured to control a recording operation so as to move the recording head and the recording medium relative to each other in a direction intersecting the predetermined direction and discharge the ink from the recording head onto the recording medium according to the complementary data, wherein, if at least one discharge port among the plurality of ink discharge ports is identified as the defective discharge port, the complementing unit determines to use a discharge port that is one of predetermined discharge ports adjacent to the at least one discharge port on both side in the predetermined direction as the complementary discharge port, and
wherein, if a tone value indicated by the tone data indicates a tone value half as large as a maximum tone value, the determination unit determines not to discharge the ink at more than half positions each adjacent in the predetermined direction to a position at which the ink should be discharged by the at least one discharge port and possible to be subjected

Assignees

• Canon Kk

Inventors

• Komamiya Eiji
• Edamura Tetsuya

Classifications

• B41J2/2139 Primary

  Compensation for malfunctioning nozzles creating dot place or dot size errors (generating single droplets or particles on demand by pressure, e.g. electromechanical transducers B41J2/045) · CPC title

• B41J2/2146

  for line print heads · CPC title

• B41J2/155

  for line printing · CPC title

• B41J2/2142

  Detection of malfunctioning nozzles (generating single droplets or particles on demand by pressure, e.g. electromechanical transducers B41J2/045, B41J2/05; jet deflection sensors B41J2/125; for cleaning purposes B41J2/16579) · CPC title

• B41J2/2054

  by the variation of dot disposition or characteristics, e.g. dot number density, dot shape · CPC title