Printing apparatus, control method thereof and storage medium

Patent metadata

Field	Value
Publication number	US-11429050-B2
Application number	US-202016929399-A
Country	US
Kind code	B2
Filing date	Jul 15, 2020
Priority date	Jul 24, 2019
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

An object of one embodiment of the present disclosure is to accurately suppress a color shift. One embodiment of the present disclosure is a printing apparatus including: a print head having a nozzle column including a plurality of nozzles through which ink is ejected; an acquiring unit configured to acquire a measurement value by reading a tone patch pattern printed by the print head; and a setting unit configured to set a printing characteristic based on the measurement value and a target value, and the printing apparatus further includes a determination unit configured to determine whether or not reading has been performed normally based on a variation amount calculated by using the measurement value.

First claim

What is claimed is:

1. A printing apparatus comprising:
a print head including a nozzle column, the nozzle column including a plurality of nozzles through which ink is ejected;
an acquiring unit configured to acquire measurement values by reading a plurality of tone patch patterns printed by the print head, the tone patch patterns having tones that are different from each other;
a controller configured to control a displaying unit to display a warning based on the measurement values; and
a correcting unit configured to correct multi-valued input tone levels of pixels based on the measurement values in a case where the controller obtains information indicating that a user has checked the warning.

2. The printing apparatus according to claim 1 , further comprising a derivation unit configured to derive correction amounts for each tone based on the measurement values and a target value.

3. The printing apparatus according to claim 2 , further comprising a calculation unit configured to calculate a correction amount variation rate based on the derived correction amounts.

4. The printing apparatus according to claim 1 , wherein the measurement values are one of density values, colorimetric values, or gloss values.

5. The printing apparatus according to claim 1 , further comprising a determination unit configured to determine whether or not the reading has been performed correctly based on the measurement values,
wherein the controller controls the displaying unit to display the warning in a case where the determination unit determines that the reading has not been performed correctly.

6. The printing apparatus according to claim 5 , wherein the determination unit determines that:
reading has been performed correctly in a case where the measurement values are within a predetermined range; and
reading has not been performed correctly in a case where the measurement values are not within the predetermined range.

7. The printing apparatus according to claim 6 , wherein the print head or the plurality of nozzles has a variation in ejection amount, and
wherein within the predetermined range is less than or equal to correction amounts corresponding to a first print head that ejects ink whose supposed ejection amount is an upper limit value and more than or equal to correction amounts corresponding to a second print head that ejects ink whose supposed ejection amount is a lower limit value.

8. The printing apparatus according to claim 7 , wherein the determination unit determines that reading has not been performed correctly even in a case where the derived correction amounts are more than or equal to the correction amount corresponding to the first print head and less than or equal to the correction amount corresponding to the second print head.

9. The printing apparatus according to claim 5 , wherein the determination unit determines whether or not reading has been performed correctly based on a variation amount of the measurement values and a variation amount of target values.

10. The printing apparatus according to claim 9 , wherein the determination unit determines whether or not reading has been performed correctly by using a deviation amount between the variation amount of the measurement values and the variation amount of the target values, or using a slope of the variation amount of the measurement values and a slope of the variation amount of the target values.

11. The printing apparatus according to claim 5 , wherein the controller does not control the displaying unit to display the warning in a case where the determination unit determines that the reading has been performed correctly.

12. The printing apparatus according to claim 1 , wherein the controller stores the measurement values in a memory in a case where the controller obtains information indicating that a user has checked the warning.

13. The printing apparatus according to claim 12 , wherein after displaying the warning, the controller waits until the controller obtains information indicating that a user has checked the warning.

14. The printing apparatus according to claim 1 , further comprising a setting unit configured to set correction amounts based on the measurement values and a target value, and
wherein the correction unit corrects the multi-valued input tone level of each pixel using the correction amounts.

15. The printing apparatus according to claim 14 , wherein the correction amounts are values for correcting variation of a printing characteristic of the print head or a printing characteristic of the plurality of nozzles.

16. A control method of a printing apparatus, the printing apparatus including a print head including a nozzle column, the nozzle column including a plurality of nozzles through which ink is ejected, the control method comprising:
a step of acquiring measurement values by reading a plurality of tone patch patterns printed by the print head, the tone patch patterns having tones that are different from each other;
a step of controlling a displaying unit to display a warning based on the measurement values; and
a step of correcting multi-valued input tone levels of pixels based on the measurement values in a case where the controller obtains information indicating that a user has checked the warning.

17. A non-transitory computer-readable storage medium storing a program for causing a computer to perform a control method of a printing apparatus, the printing apparatus including a print head including a nozzle column, the nozzle column including a plurality of nozzles through which ink is ejected, the control method comprising:
a step of acquiring measurement values by reading a plurality of tone patch patterns printed by the print head, the tone patch patterns having tones that are different from each other;
a step of controlling a displaying unit to display a warning based on the measurement values; and
a step of correcting multi-valued input tone levels of pixels based on the measurement values in a case where the controller obtains information indicating that a user has checked the warning.

Assignees

• Canon Kk

Inventors

• Baba Naoko

Classifications

• G03G15/553 Primary

  Monitoring or warning means for exhaustion or lifetime end of consumables, e.g. indication of insufficient copy sheet quantity for a job · CPC title

• H04N1/6044

  involving a sensor integrated in the machine or otherwise specifically adapted to read the test pattern · CPC title

• G01J3/501 Primary

  Colorimeters using spectrally-selective light sources, e.g. LEDs · CPC title