Image recording apparatus and method of detecting defective recording element

Patent metadata

Field	Value
Publication number	US-10046582-B2
Application number	US-201615354203-A
Country	US
Kind code	B2
Filing date	Nov 17, 2016
Priority date	Jun 4, 2014
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

Provided are an image recording apparatus that efficiently detects defective recording elements causing image defects in a plurality of recording heads and a method of detecting the defective recording elements. An image recording apparatus including: a plurality of recording heads; an indicator acquisition unit for acquiring an indicator which relatively indicates how easily image defects are visually perceived for each color, an appearance ratio setting unit for setting an appearance ratio of a test pattern as a higher value as the indicator of each color becomes higher; a recording unit for recording the test pattern of each color on a recording medium at the appearance ratio; an imaging unit for capturing an image of the test pattern which is recorded on the recording medium; and an analysis unit for analyzing the captured test pattern and detecting a defect of a recording element in the recording head.

First claim

What is claimed is:

1. An image recording apparatus comprising:
a plurality of recording heads that respectively eject inks with different colors from recording elements;
a processor that is configured to acquire an indicator which relatively indicates how easily image defects are visually perceived for each color, and set an appearance ratio of a test pattern of a color having an indicator higher than an indicator of the other color to be higher than an appearance ratio of a test pattern of the other color;
a recording unit for recording the test pattern of each color on a recording medium at the appearance ratio through the plurality of recording heads; and
an imaging unit for capturing an image of the test pattern which is recorded on the recording medium, wherein
the processor is further configured to analyze the captured test pattern and detect a defective recording element in the recording head that has recorded the test pattern.

2. The image recording apparatus according to claim 1 , further comprising a storage unit for storing the indicator according to a density, wherein
the processor is configured to acquire the indicator according to the density of a recorded image.

3. The image recording apparatus according to claim 1 , wherein the indicator, which relatively indicates how easily image defects are visually perceived for each color, is a proportion of the number of image defects which are visually perceived in an image of each color obtained by recording the same image for each ink color.

4. The image recording apparatus according to claim 2 , wherein the indicator, which relatively indicates how easily image defects are visually perceived for each color, is a proportion of the number of image defects which are visually perceived in an image of each color obtained by recording the same image for each ink color.

5. The image recording apparatus according to claim 1 , further comprising a printing proportion acquisition unit for acquiring a printing proportion of each color for the recorded image, wherein
the processor is configured to set the indicator of a color having a printing proportion higher than a printing proportion of the other color to be higher than the indicator of the other color.

6. The image recording apparatus according to claim 2 , further comprising a printing proportion acquisition unit for acquiring a printing proportion of each color for the recorded image, wherein
the processor is configured to set the indicator of a color having a printing proportion higher than a printing proportion of the other color to be higher than the indicator of the other color.

7. The image recording apparatus according to claim 3 , further comprising a printing proportion acquisition unit for acquiring a printing proportion of each color for the recorded image, wherein
the processor is configured to set the indicator of a color having a printing proportion higher than a printing proportion of the other color to be higher than the indicator of the other color.

8. The image recording apparatus according to claim 5 , wherein the printing proportion of each color is a proportion of an amount of the ink of each color ejected for the recorded image.

9. The image recording apparatus according to claim 5 , wherein the printing proportion of each color is a proportion of the number of ejection operations of the ink of each color ejected for the recorded image.

10. The image recording apparatus according to claim 5 , wherein
the printing proportion acquisition unit divides the recorded image into a plurality of regions, and acquires the printing proportion of each color for each of the divided regions,
the processor is configured to set the appearance ratio for each of the divided regions, and
the recording unit records the test pattern of each color at the appearance ratio for each of the divided regions.

11. The image recording apparatus according to claim 8 , wherein
the printing proportion acquisition unit divides the recorded image into a plurality of regions, and acquires the printing proportion of each color for each of the divided regions,
the processor is configured to set the appearance ratio for each of the divided regions, and
the recording unit records the test pattern of each color at the appearance ratio for each of the divided regions.

12. The image recording apparatus according to claim 9 , wherein
the printing proportion acquisition unit divides the recorded image into a plurality of regions, and acquires the printing proportion of each color for each of the divided regions,
the processor is configured to set the appearance ratio for each of the divided regions, and
the recording unit records the test pattern of each color at the appearance ratio for each of the divided regions.

13. The image recording apparatus according to claim 10 , further comprising a transporting unit for transporting the recording medium to the plurality of recording heads only once, wherein
the plurality of recording heads are a plurality of line heads each of which has recording elements arranged to extend in a direction perpendicular to a transport direction of the recording medium, and
the printing proportion acquisition unit divides the recorded image into a plurality of regions in the transport direction of the transporting unit.

14. The image recording apparatus according to claim 10 , wherein the recorded image is an image in which a plurality of images each having the same size is imposed.

15. The image recording apparatus according to claim 13 , wherein the recorded image is an image in which a plurality of images each having the same size is imposed.

16. The image recording apparatus according to claim 5 , wherein the processor is configured to set the appearance ratio of a color to 0, in case where the indicator, the printing proportion, or a proportion of a product of the indicator and the printing proportion for the color is less than a threshold value.

17. The image recording apparatus according to claim 8 , wherein the processor is configured to set the appearance ratio of a color to 0, in case where the indicator, the printing proportion, or a proportion of a product of the indicator and the printing proportion for the color is less than a threshold value.

18. The image recording apparatus according to claim 9 , wherein the processor is configured to set the appearance ratio of a color to 0, in case where the indicator, the printing proportion, or a proportion of a product of the indicator and the printing proportion for the color is less than a threshold value.

19. The image recording apparatus according to claim 1 , wherein
assuming that the number of recording heads is i and the number of test patterns to be recorded is j,
the recording unit records the first i test patterns by using the i recording heads one by one, and records the remaining (j-i) test patterns at the appearance ratio which is set for each color.

20. A method of detecting a defective recording element using the image recording apparatus according to claim 1 comprising:
an indicator acquisition step of acquiring an indicator which relatively indicates how easily image defects are visually perceived for each color of respective inks with different colors ejected from recording elements by a plurality of recording heads;
an appearance ratio setting step of setting an appearance ratio of a test pattern of a color having an indicator higher than an indicator of the other color to be higher than an appearance rat

Assignees

• Fujifilm Corp

Inventors

• Kyoso Tadashi
• Yamanobe Jun
• Sumi Katsuto

Classifications

• B41J2025/008

  comprising a plurality of print heads placed around a drum · CPC title

• H04N1/6036

  involving periodic tests or tests during use of the machine · CPC title

• B41J29/38

  Drives, motors, controls or automatic cut-off devices for the entire printing mechanism · CPC title

• B41J29/393 Primary

  Devices for controlling or analysing the entire machine {; Controlling or analysing mechanical parameters involving printing of test patterns} · 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