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JP-2026075999-A - Inkjet recording device and recording method

JP2026075999AJP 2026075999 AJP2026075999 AJP 2026075999AJP-2026075999-A

Abstract

[Problem] To suppress the degradation of color reproduction in image recordings that depends on the observation conditions. [Solution] An inkjet recording device for recording an image on a recording medium comprises: a first recording means for ejecting a specific color ink having a specific color onto the recording medium to record a specific color image; a second recording means for ejecting color ink onto the specific color image recorded on the recording medium to record a color image; and a control means for controlling the ejection amount of the specific color ink. The control means varies the ejection amount of the specific color ink per unit area according to the observation conditions when an observer observes the recorded medium on which the color image is recorded. [Selection Diagram] Figure 5

Inventors

  • 眞本 達生

Assignees

  • キヤノン株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (13)

  1. An inkjet recording device for recording images on a recording medium, A first recording means for recording a specific color image by ejecting a specific color ink having a specific color onto the recording medium, A second recording means for recording a color image by ejecting color ink onto the specific color image recorded on the recording medium, A control means for controlling the amount of the specific color ink ejected by the first recording means, Equipped with, The control means is characterized by varying the amount of specific color ink ejected per unit area according to the observation conditions when an observer observes the recorded medium on which the color image is recorded.
  2. The inkjet recording apparatus according to claim 1, characterized in that the observation conditions are based on a first illuminance which is reflected light from a first illumination source located on the observer side of the recorded medium, and a second illuminance which is transmitted light from a second illumination source located on the opposite side of the recorded medium from the observer, when the observer observes the color image recorded on the recorded medium.
  3. The inkjet recording apparatus according to claim 2, characterized in that the control means increases the amount of ejection of the specific color ink per unit area when the observation conditions indicate that the relative ratio of the second illuminance to the sum of the first illuminance and the second illuminance is lower than the first ratio, compared to when the relative ratio is higher than the first ratio.
  4. The inkjet recording apparatus according to claim 3, characterized in that, when the relative ratio is lower than the first ratio, the control means reduces the amount of specific color ink ejected per unit area in areas of the color image where the brightness is less than a predetermined brightness compared to areas where the brightness is above a predetermined brightness.
  5. The aforementioned color inks include black (K) ink, cyan (C) ink, magenta (M) ink, and yellow (Y) ink. The control means is For the hue range using Y ink, if the relative ratio is lower than the first ratio, the amount of the specific color ink ejected per unit area is increased in the region of the color image where the brightness is below a predetermined brightness compared to the region where the brightness is above the predetermined brightness. The inkjet recording apparatus according to claim 3, characterized in that, for a hue range in which Y ink is not used, if the relative ratio is lower than the first ratio, the amount of specific color ink ejected per unit area is reduced for areas in the color image where the brightness is less than a predetermined brightness compared to areas where the brightness is above a predetermined brightness.
  6. The inkjet recording apparatus according to claim 2, characterized in that the control means reduces the amount of specific color ink ejected per unit area when the observation conditions indicate that the relative ratio of the second illuminance to the sum of the first illuminance and the second illuminance is higher than the second ratio, compared to when the relative ratio is lower than the second ratio.
  7. The inkjet recording apparatus according to claim 1, characterized in that the control means varies the amount of specific color ink ejected per unit area according to the hue.
  8. The recording medium is transparent to at least some visible light, The inkjet recording apparatus according to claim 1, characterized in that the recorded medium is placed on a transparent window.
  9. The inkjet recording apparatus according to claim 1, characterized in that the specified color ink is white ink.
  10. The inkjet recording apparatus according to claim 1, further comprising a means for receiving the aforementioned observation conditions from a user.
  11. A control method for an inkjet recording device that records images on a recording medium, The aforementioned inkjet recording device is A first recording means for recording a specific color image by ejecting a specific color ink having a specific color onto the recording medium, A second recording means for recording a color image by ejecting color ink onto the specific color image recorded on the recording medium, A control means for controlling the amount of the specific color ink ejected by the first recording means, Equipped with, The control method described above is A receiving process for receiving observation conditions when an observer observes the recorded medium on which the aforementioned color image is recorded, A determination step in which the amount of the specific color ink ejected per unit area is determined according to the observation conditions, Includes, A control method characterized in that the first discharge amount per unit area of the specific color ink, determined for a first observation condition, is different from the second discharge amount per unit area of the specific color ink, determined for a second observation condition different from the first observation condition.
  12. The system includes control means for controlling a first recording, which records a specific color image by ejecting a specific color ink having a specific color onto a recording medium, and a second recording, which records a color image by ejecting color ink onto the specific color image recorded on the recording medium. The control means is characterized by varying the amount of specific color ink ejected per unit area according to the observation conditions when an observer observes the recorded medium on which the color image is recorded.
  13. A program for causing a computer to function as an image processing device according to claim 12.

Description

This invention relates to a technique for ejecting ink to form an image. Inkjet recording devices are known that record images onto a recording medium by ejecting ink from a recording head onto the medium. Transparent recording media are sometimes used for window advertising. When recording images onto transparent recording media, layered recording of a color ink layer and a white ink layer may be performed to adjust the transparency of the color ink layer. However, since transparency is difficult to quantify, the client and the printing company actually perform the printing and check whether the transparency matches the image. If the transparency does not match the image, the amount of white ink (white opacity) is adjusted and the printing is redone. Patent Document 1 discloses a method for adjusting the ejection rate, which indicates the amount of white ink per unit area, according to the opacity of the color image. Japanese Patent Publication No. 2019-147267 This is a perspective view of an inkjet recording device.This is a cross-sectional view of the recording device.This is a schematic diagram illustrating the recording head.This is a diagram showing the recording and control system.This is a flowchart for generating recorded data.This diagram illustrates the image formation process in stacked image recording.This is a diagram illustrating stacked image recording.This diagram illustrates the relationship between observation conditions and white opacity in relation to color reproduction.This diagram illustrates the relationship between observation conditions and white opacity with respect to the color gamut.This diagram illustrates the three observation conditions.This is a flowchart of the image data processing (first embodiment).This is a schematic diagram showing the color gamut as a three-dimensional object.This diagram illustrates the adjustment of the ink injection amount according to the observation conditions (first embodiment).This figure shows an example of an LUT depending on the observation conditions (first embodiment).This figure shows the distribution process of color ink, W ink, and reaction liquid ink.This diagram illustrates the adjustment of the ink injection amount according to the observation conditions (second embodiment).This figure shows an example of an LUT depending on the observation conditions (second embodiment).This figure shows the color reproduction range with different methods for adjusting the white opacity depending on the hue angle.This figure shows an example of the UI screen for selecting the recording mode.This figure shows an example of a UI screen that allows manual adjustment of the amount of white ink injected. The embodiments will be described in detail below with reference to the attached drawings. Note that the embodiments described below do not limit the invention as defined in the claims. While multiple features are described in the embodiments, not all of these features are necessarily essential to the invention, and the features may be combined in any way. Furthermore, in the attached drawings, identical or similar configurations are given the same reference numerals, and redundant descriptions are omitted. (First Embodiment) As a first embodiment of the inkjet recording apparatus according to the present invention, a serial scanning type inkjet recording apparatus will be described below as an example. Furthermore, after first describing multi-pass stacked image recording in the recording apparatus, the adjustment of the white opacity according to the observation conditions will be described below. <Device configuration> Figure 1 is a perspective view of the external appearance of an inkjet recording device (printer). This is a so-called serial scanning type printer, which records an image (ink image) on the recording medium P by scanning the recording head in an intersecting direction (X direction) perpendicular to the transport direction (Y direction) of the recording medium P. The configuration and general operation of this inkjet recording device during recording are described below. First, the recording medium P is transported in the Y direction from the spool 6, which holds the recording medium P, by transport rollers driven via gears by a transport motor (not shown). Meanwhile, at a predetermined transport position, the carriage unit 2 is reciprocated (scanned) along a guide shaft 8 extending in the X direction by a carriage motor (not shown). During this scanning process, based on the position signal obtained by the encoder 7, the recording head, which is detachably mounted on the carriage unit 2, performs an ejection operation from its nozzle, recording a certain bandwidth corresponding to the arrangement range of the nozzles. In this embodiment, scanning is performed at a scanning speed of 40 inches per second, and recording is performed at a resolution of 1200 dpi (1/1200 inch interval). Subsequently, the recording medium P is transported, an