Recording apparatus and recording method

Patent metadata

Field	Value
Publication number	US-10507646-B2
Application number	US-201715709278-A
Country	US
Kind code	B2
Filing date	Sep 19, 2017
Priority date	Sep 23, 2016
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

Priority order is updated so that an ejection port that is selected as an ejection port subjected to ejection failure determination in a pixel row in which a previous ejection operation is to be performed has the lowest priority order, which is used for selecting an ejection port subjected to ejection failure determination, in a pixel row in which a subsequent ejection operation is to be performed.

First claim

What is claimed is:

1. A recording apparatus, comprising:
a recording head in which a plurality of ejection ports for ejecting ink are arranged in a predetermined direction;
an acquisition unit configured to acquire recording data for deciding ejection or non-ejection of ink to each pixel;
a control unit configured to cause the recording head to perform an ejection operation from the plurality of ejection ports on a basis of the recording data while relatively moving the recording head and a recording medium in a cross direction crossing the predetermined direction;
a selection unit configured to select a target ejection port, from among the plurality of ejection ports in accordance with a predetermined priority order of the plurality of ejection ports with respect to each of a plurality of pixel rows arranged in the cross direction, wherein a plurality of pixels are arranged in a predetermined direction in each of the pixel rows; and
a determination unit configured to determine, on a basis of the ejection operation, whether or not the target ejection port selected by the selection unit with respect to each of the pixel rows in the cross direction is in ejection failure, wherein
the selection unit updates priority order for selecting the target ejection port for subjecting to the determination by the determination unit so that a previous target ejection port selected by the selection unit for subjecting to the determination by the determination unit with respect to a pixel row corresponding to a previous ejection operation of two pixel rows adjacent to each other in the cross direction has lowest priority order with respect to a pixel row corresponding to a subsequent ejection operation and selects, on a basis of the updated priority order, a target ejection port for subjecting to the determination by the determination unit with respect to the pixel row for which the subsequent ejection operation is to be performed.

2. The recording apparatus according to claim 1 , wherein the selection unit updates priority order with respect to the two pixel rows so that an ejection port which is not selected by the selection unit in the pixel row corresponding to the previous ejection operation has higher priority order with respect to the pixel row corresponding to the subsequent ejection operation.

3. The recording apparatus according to claim 2 , wherein the selection unit updates priority order so that priority order of some ejection ports among the plurality of ejection ports is the same between the two pixel rows.

4. The recording apparatus according to claim 1 , wherein the selection unit updates priority order with respect to the two pixel rows so that (i) an ejection port which is not selected by the selection unit with respect to the pixel row corresponding to the previous ejection operation and which has priority order higher than priority order of an ejection port which is selected by the selection unit with respect to the pixel row corresponding to the previous ejection operation has the same priority order with respect to the pixel row corresponding to the subsequent ejection operation and (ii) an ejection port which is not selected by the selection unit with respect to the pixel row corresponding to the previous ejection operation and which has priority order lower than priority order of the ejection port which is selected by the selection unit with respect to the pixel row corresponding to the previous ejection operation has higher priority order with respect to the pixel row corresponding to the subsequent ejection operation.

5. The recording apparatus according to claim 4 , wherein the selection unit updates priority order so that priority order of the plurality of ejection ports is different between the pixel rows.

6. The recording apparatus according to claim 1 , wherein the selection unit determines whether or not ejection of ink is decided by the recording data in order from an ejection port having higher priority order with respect to each of the pixel rows and selects, as the target ejection port, an ejection port that is determined as being decided to perform ejection of ink first.

7. The recording apparatus according to claim 1 , wherein the control unit performs control so that a plurality of driving blocks obtained by dividing the plurality of ejection ports in the recording head are driven at different timings with respect to the same pixel row to perform an ejection operation from the plurality of ejection ports, and
the selection unit selects the target ejection port for each of the driving blocks with respect to the same pixel row.

8. The recording apparatus according to claim 1 , wherein the selection unit (i) selects the target ejection port with respect to each of the pixel rows while updating a first initial priority order until a predetermined timing has come after an ejection operation by the control unit starts and (ii) selects the target ejection port with respect to each of the pixel rows while updating a second initial priority order different from the first initial priority order after the predetermined timing has come.

9. The recording apparatus according to claim 8 , wherein the second initial priority order is order obtained by offsetting the first initial priority order.

10. The recording apparatus according to claim 1 , further comprising a complementation unit configured to complement, by another ejection port from which ejection is normally performed, ejection of ink from an ejection port that is determined by the determination unit as having ejection failure.

11. The recording apparatus according to claim 1 , wherein the recording head has one ejection determination detection circuit used for determination of the ejection failure in the ejection port by the determination unit connected to the plurality of ejection ports arranged in the ejection port array.

12. The recording apparatus according to claim 11 , wherein when an ejection operation is performed from the ejection port, the ejection determination detection circuit detects at least one of a temperature change and a pressure change in the recording head associated with the ejection operation.

13. A recording method for performing recording by using a recording head in which a plurality of ejection ports for ejecting ink are arranged in a predetermined direction, comprising:
acquiring recording data for deciding ejection or non-ejection of ink to each pixel;
causing the recording head to perform an ejection operation from the plurality of ejection ports on a basis of the recording data while relatively moving the recording head and a recording medium in a cross direction crossing the predetermined direction;
selecting a target ejection port, from among the plurality of ejection ports in accordance with predetermined priority order of the plurality of ejection ports, with respect to each of a plurality of pixel rows arranged in the cross direction, wherein a plurality of pixels are arranged in a predetermined direction in each of the pixel row;
determining, on a basis of the ejection operation, whether or not the target ejection port selected with respect to each of the pixel rows in the cross direction are in ejection failure, and
updating the priority order so that a previous target ejection port selected in with respect to a pixel row corresponding to a previous ejection operation of two pixel rows adjacent to each other in the cross direction has lowest priority order with respect to a pixel row corresponding to a subsequent ejection operation and selecting, on a basis of the updated priority order, a target ejection port for subjecting to the determination by the deter

Assignees

• Canon Kk

Inventors

• Kitai Satoshi
• Serizawa Kouichi
• Umezawa Masahiko
• Takahashi Atsushi
• Ikegami Shinsuke
• Murase Takeshi
• Hayashi Masashi
• Sawai Yuki

Classifications

• B41J2/0451 Primary

  for detecting failure, e.g. clogging, malfunctioning actuator · CPC title

• B41J2/04586

  controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type · CPC title

• B41J2/2139

  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

• B41J2/04546

  Multiplexing · CPC title

• B41J2/04543

  Block driving · CPC title