Ink jet recording apparatus and ink jet recording method

Patent metadata

Field	Value
Publication number	US-12280589-B2
Application number	US-202217839720-A
Country	US
Kind code	B2
Filing date	Jun 14, 2022
Priority date	Jun 15, 2021
Publication date	Apr 22, 2025
Grant date	Apr 22, 2025

Abstract

An ink jet recording apparatus according to the present invention includes: a conveying unit that conveys a recording medium; a pretreatment unit that performs corona treatment on a surface of the recording medium; an ink image forming unit configured to be able to form an ink image by applying an ink of at least two colors, the ink containing an anionic pigment; a brightness measuring unit that measures brightness of the ink image; and a corona treatment intensity changing unit configured to change a corona treatment intensity of the pretreatment unit based on a result of the brightness measuring unit.

First claim

What is claimed is:

1. An ink jet recording apparatus comprising:
a conveying unit that conveys a recording medium;
a pretreatment unit that performs corona treatment on a surface of the recording medium;
an ink image forming unit configured to be able to form an ink image by applying inks of at least two colors so that one of the inks overlaps a region on the recording medium to which another of the inks has been applied, each of the inks containing an anionic pigment;
a brightness measuring unit that measures brightness of the ink image containing a region which is overlapped by the inks of at least two colors; and
a corona treatment intensity changing unit configured to change a corona treatment intensity of the pretreatment unit based on a result obtained by the brightness measuring unit.

2. The ink jet recording apparatus according to claim 1 , wherein the corona treatment intensity changing unit is configured to change the corona treatment intensity of the pretreatment unit until the result obtained by the brightness measuring unit becomes less than or equal to a preset brightness reference value.

3. The ink jet recording apparatus according to claim 1 , wherein the corona treatment intensity changing unit is configured to increase the corona treatment intensity stepwise, and change the corona treatment intensity of the pretreatment unit until a value of a difference between brightness obtained at an n-th time in the brightness measuring unit and brightness obtained at an (n+1)-th time becomes less than or equal to a preset brightness difference.

4. The ink jet recording apparatus according to claim 1 , wherein the corona treatment intensity changing unit is configured to change an output of the corona treatment of the pretreatment unit.

5. The ink jet recording apparatus according to claim 1 , wherein the corona treatment intensity changing unit is configured to change a conveying speed of the recording medium in the conveying unit.

6. The ink jet recording apparatus according to claim 1 , wherein the pretreatment unit is disposed upstream of the ink image forming unit with respect to a conveyance direction of the recording medium.

7. The ink jet recording apparatus according to claim 1 , wherein the brightness measuring unit is disposed downstream of the ink image forming unit with respect to a conveying direction of the recording medium.

8. An ink jet recording method comprising:
a conveying step of conveying a recording medium;
a pretreatment step of performing corona treatment on a surface of the recording medium;
an ink image forming step of forming an ink image by applying inks of at least two colors so that one of the inks overlaps a region on the recording medium to which another of the inks has been applied, each of the inks containing an anionic pigment;
a brightness measuring step of measuring brightness of the ink image containing a region which is overlapped by the inks of at least two colors; and
a corona treatment intensity changing step of changing a corona treatment intensity in the pretreatment step based on a result obtained in the brightness measuring step.

9. The ink jet recording method according to claim 8 , wherein the ink image is a rectangular solid image.

Assignees

• Canon Kk

Inventors

• Takeuchi Keiichirou
• Inoue Koji

Classifications

• B41J2/12

  testing or correcting charge or deflection · CPC title

• B41J2203/01

  Inspecting a printed medium or a medium to be printed using a sensing device · CPC title

• B41J11/007 Primary

  Conveyor belts or like feeding devices · CPC title

• B41J11/0015 Primary

  for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing (selective coating B41J2/2114) · CPC title