WO2017033327A1

WO2017033327A1 - Method for measuring saturated ink amount

Info

Publication number: WO2017033327A1
Application number: PCT/JP2015/074175
Authority: WO
Inventors: 津久井　克幸; 義雄浅見
Original assignee: 武藤工業株式会社
Priority date: 2015-08-27
Filing date: 2015-08-27
Publication date: 2017-03-02

Abstract

The purpose of the present invention is to enable accurate measurement of a saturated state of ink of an ink patch chart. The ink patch chart in which an ink ejection amount per unit area is changed in stages is printed on a printing medium, the ink patch chart is read with a sensor, and a saturated ink amount is determined on the basis of the read data. The sensor is configured to read an area including a thick-ink end part of the ink patch chart.

Description

Measuring method of saturated ink amount

The present invention relates to a method for measuring a saturated ink amount for determining a printing saturation amount of ink in a paper printing range in an inkjet printer.

The ink jet printer prints a color image by ejecting four color inks such as C (cyan), M (magenta), Y (yellow), and K (black) onto a print medium. Depending on the combination of medium and ink used, the speed at which ink is absorbed by the medium and the speed at which it dries are different, so if more ink than necessary is ejected per unit area, bleeding may occur due to an excessive amount of ink. There are cases where the ink that has been squeezed out leaks out on the back side of the print medium, and various other inconveniences occur, resulting in a significant reduction in print quality.
In order to prevent this, it is necessary to know the saturation amount of ink when the ink and the printing medium are used singly or in combination. Conventionally, an ink patch chart with a sufficiently wide area that can be read by a sensor is printed. Then, the ink saturation amount is determined by measuring the density of the ink in a portion near the center of the ink patch chart. In that case, the ink patch chart to be printed generally has a rectangular shape that is sufficiently wider than the reading port of the sensor (see, for example, FIG. 3 of Patent Document 1).

Japanese Patent Laying-Open No. 2005-231179

When the saturated ink amount is measured, when the light receiving part of the reflected light from the sensor patch that reads the square ink patch chart is circular, the reading range E by the sensor of the ink patch chart 2 is patch 2 as shown in FIG. Smaller. There is no problem if the ink in the patch 2 is small, but when the ink becomes saturated, only the edge of the ink patch chart 2 or a part inside the ink patch chart 2 is necessary within the printed range as shown in FIG. 16B. Since the ink is ejected (supplied) as described above, there are cases where the ink rises in part due to surface tension or the like after adjacent dots (inks) are connected, and a dark portion 2a is formed. In this case, when the ink patch chart 2 is read by the sensor, the ink dark portion 2a deviates from the reading range E of the sensor, or the ink dark portion 2a is often included in the reading range E. Since the application portion is read, the read data of the sensor may not accurately represent the state of the printed ink amount.
Also, by making the shape of the ink patch chart the same as the opening of the colorimeter and making the size the same or slightly larger, it is possible to read almost the entire area of the ink patch chart including the biased ink application portion. It becomes like this. As a result, ink overflow exists around the colorimetric range, and the measurement value is included as information. However, if the opening is large even if it has the same shape as the opening of the colorimeter, the area occupied by the ink overflow is relatively reduced. For this reason, ink overflow cannot be detected accurately. In addition, when ink density unevenness (mottling) exists in a part of the colorimetric range of the ink patch, there arises a problem that a measured value different from the original density is obtained.
The present invention aims to solve the above problems.

In order to achieve the above object, the present invention prints an ink patch chart in which the ink discharge amount per unit area is changed in stages on a printing medium, reads each ink patch chart with a sensor, and based on the read data In the saturated ink amount measuring method in which the saturated ink amount is measured, an area including the dark edge portion of the ink patch chart is read by the sensor.
Further, in the present invention, the ink patch chart has an overall shape that is longer than the shape of the light receiving portion of the sensor, and an area including a dark edge portion of the ink patch chart and a thin intermediate area of the ink are respectively described above. It is characterized by being read by a sensor.
According to the present invention, the ink patch chart has an overall shape that is longer than the shape of the light receiving portion of the sensor, and the ink patch chart has a shape that is the same as or overlaps with the shape of both sides of the shape of the light receiving portion of the sensor. It is characterized by comprising an end area and an intermediate area formed between the end areas.
Further, the present invention is such that the shape of the light receiving portion of the sensor is circular, the intermediate area of the ink patch chart is a rectangular area, the side end side area is an arcuate area formed on both ends of the rectangular area, The diameter of the circle of the light receiving part of the sensor is the same as the diameter of the arc of the arcuate area, or the diameter of the arc is slightly increased.
According to the present invention, the shape of the light receiving portion of the sensor is circular, and the overall shape of the ink patch chart is configured to have different lengths in the long axis direction and the short axis direction, and the short axis direction is the diameter dimension of the light receiving portion. The long axis direction is composed of an arcuate area having a radius equal to or slightly longer than the radius of the light receiving portion and a rectangular area having an arbitrary length.
In the invention, it is preferable that the length of the rectangular area in the minor axis direction is set to be the same as or slightly larger than the diameter of the circle of the light receiving portion of the sensor.
According to the present invention, the length of the rectangular area in the minor axis direction is set to be larger than the diameter of the circle of the light receiving portion of the sensor.
Further, the present invention is characterized in that the shape of the light receiving portion of the sensor is a square, and the side end side area of the ink patch chart is a square shape that is the same as or overlaps with the shape of both sides of the rectangular light receiving portion.
According to the present invention, the sensor applies light emitted from the light source to the surface of the object to be measured from the opening of the case, and guides the reflected light reflected from the surface to the optical sensor from the opening to detect the reflected light. It is a colorimeter, and the light receiving portion of the sensor is an opening of a case of the colorimeter.
According to the present invention, the sensor applies light emitted from the light source to the surface of the object to be measured from the opening of the case, and guides the reflected light reflected from the surface to the optical sensor from the opening to detect the reflected light. It is a spectrophotometer, The light-receiving part of the said sensor is an opening part of the case of the said spectrophotometer, It is characterized by the above-mentioned.
Further, the present invention is characterized in that an area including a dark portion of the ink patch chart and a thin area of the ink are respectively measured by the sensor, and a saturated ink amount is determined from a difference between the measured values. .
Further, the invention is characterized in that the shape of the light receiving portion of the sensor is the same as the shape of the ink patch chart.
Further, the invention is characterized in that the shape of the light receiving portion and the shape of the ink patch chart are circular.

According to the present invention, an accurate value can be read even in a portion where the amount of ink with respect to the print medium has increased, so that an accurate value of the saturation amount of ink can be grasped. For this reason, it is possible to work with accurate data in determination of the ink discharge amount with respect to the print medium in the ink jet printer and image processing such as RIP (raster image processor), so that printing with higher color reproduction accuracy can be performed. it can.
In addition, when measurement is performed a plurality of times for the ink patch chart to be measured, measurement information for the area including the surrounding portion where ink overflow occurs and measurement information for the area of the intermediate portion are obtained. Since the result is an average value of a plurality of times instead of the measurement at, a more accurate ink saturation amount can be grasped. Therefore, it is possible to perform operations with accurate data in image processing such as determination of ink discharge amount to a printing medium and RIP (raster image processing) in an ink jet printer, so that printing with higher color reproduction accuracy can be performed. it can.

It is explanatory drawing of a colorimeter. It is explanatory drawing of an ink patch chart. It is explanatory drawing of this invention. It is explanatory drawing of an ink patch chart. It is explanatory drawing which shows other embodiment of an ink patch chart. 1 is an external view of an inkjet printer. 1 is an external view of a part of an inkjet printer. It is a graph which shows the measurement data of an ink patch chart. It is a graph which shows the measurement data of an ink patch chart. It is a graph which shows the measurement data of an ink patch chart. It is explanatory drawing which shows other embodiment of an ink patch chart. It is explanatory drawing which shows other embodiment of an ink patch chart. It is explanatory drawing of other embodiment which shows the relationship between a colorimeter and an ink patch chart. It is explanatory drawing which shows other embodiment of an ink patch chart. It is explanatory drawing of other embodiment of this invention. It is explanatory drawing of a prior art.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 6 shows an overall schematic external view of the ink jet printer. The printer 4 provided with the legs 1 has a conveyance path plate 8 such as a platen that guides the printing medium 6 such as paper in the printer body 3 in the front-rear direction (sub-scanning direction) of the body and the inkjet print head 10 in the lateral direction ( A Y-axis rail 12 for guiding in the main scanning direction) is attached. A cover 14 for shielding the front of the Y-axis rail 12 is attached to the printer body 3 so as to be openable and closable.

Although the cover 14 is normally closed, FIG. 6 shows a state in which the cover 14 is opened to illustrate the inside of the cover 14. The controller of the ink jet printer 4 is connected to the computer 16, receives image data from the computer 16 via an input / output interface, discharges ink from the print head 10, and prints on the print medium 6. The computer 16 generates original color image data to be printed out. A print head 10 having ink ejection nozzles is movably attached to a Y-axis rail 12 supported horizontally on the floor of the printer 4 via a carriage.

A driving roller and a pinch roller are provided on the machine body side of the printer 4, and the printing medium 6 on the conveyance path plate 8 is sandwiched between the driving roller and a plurality of pinch rollers at the time of printing, and sub-scanning is performed by the rotation of the driving roller. It is configured to be conveyed in the direction. A maintenance box 18 is provided on one side of the machine body of the printer 4, and a control panel 18 a connected to the controller is disposed on the upper surface portion of the front surface of the box 18. Instructions can be given from this control panel.

On the other side of the machine body, there is provided a maintenance box 20 that is used for maintenance, management, and maintenance of the print head 10 that is open on the side facing the printing area. An opening / closing cover 22 is provided. In the maintenance box 20, the white color is read by the colorimeter 24, so that when the cover 22 is closed, light from outside does not enter through the gap of the cover 22. As a dark room, it has the function of providing a stable state.

As shown in FIG. 7, a stand 26 is provided in the maintenance box 20, and a plate holder 27 is fixed thereto. The plate holder 27 detachably holds a plate 28 having a white reference colored surface 28a colored with a reference white color for calibration. The print head 10 moves the carriage to the Y-axis rail 12 so that the print head 10 can move to a print area on the conveyance path plate 8, a print head standby non-print area in the maintenance box 18, and a non-print area in the maintenance box 20. Is supported through.

The print head 10 is provided with a colorimeter mounting portion, and a connector portion for detachably connecting to the connector portion of the colorimeter 24 is provided. Between the front surface of the print head 10 and the colorimeter 24, a detachable coupling means including a pin and a corresponding pin hole is provided. The colorimeter 24 used as a sensor in the present embodiment is configured so that it can also be used as a manual colorimeter that can be operated by hand.

The reading unit 24 a of the colorimeter 24 is provided with a circular opening 44 that receives reflected light from the object to be measured. In the storage device of the computer 16 connected to the controller of the printer 4, a program capable of processing image data necessary for printing by the inkjet printer 4, creation of color ink patch chart print data, and color ink A program for transmitting print data of the patch chart, a program for measuring the saturated ink amount, and the like are installed.

Next, the configuration of the colorimeter will be described with reference to FIG.
FIG. 1 is an illustration of the internal structure of a spectrophotometer used for the application of the colorimeter 24. In the present embodiment, a spectrophotometer is used as a colorimeter. A plurality of light sources 36 made of light emitting diodes (LEDs) are arranged on the circumference at equal intervals on a circuit board 34 on which circuits such as a CPU, a memory, an input / output interface, a driver, and a receiving circuit are formed. . The plurality of light sources 36 are arranged inside the cover 38 so as to protrude downward toward the object to be measured.

Inside the light shielding partition 42 for shielding the light of the light source 36, the light reflected from the surface of the object to be measured and entering the chamber of the cover 38 from the opening 44 of the cover 38 is directed and focused. A geometry converter 48 with a filter constituting an optical path geometry converter designed to do is arranged. In addition, a detection unit 52 including an optical sensor, an etalon, and a face plate is disposed above the geometry converter 48 inside the light shielding partition 42 and is electrically connected to a reception circuit of the circuit unit of the circuit board 34. is doing.

The detection unit 52 is attached to the circuit board 34, and the geometry converter 48 is held by the light shielding partition 42. The opening 44 of the cover 38 is formed in a circular shape so that the measurement object from the light source can be uniformly applied to the object to be measured.
Next, an operation of reading the ink patch chart 54 printed on the print medium 6 by the colorimeter 24 will be described.
The printer 4 prints the ink patch chart 54 on the print medium 6 as shown in FIG.

As shown in FIG. 2, the ink patch chart 54 has a rectangular area (E1) that is long in the horizontal axis direction, and is surrounded by arcs a and strings b at both ends in the horizontal axis direction of the rectangular area (E1). An arcuate area (E2) (E2) is provided. The radius of curvature of the circular arc a is set to be the same as or slightly larger than the circular radius of curvature of the colorimeter opening 44, and the diameter of the circle of the light receiving portion of the sensor is equal to the diameter of the circular arc of the arcuate area. Alternatively, the diameter of the arc is set slightly larger. The ratio between the major axis and the minor axis of the ink patch chart 54 is appropriately set experimentally, but the color measurement of the ink patch chart 54 is performed by the colorimeter 24 attached to the print head 10 of the inkjet printer 4. In the ink patch chart 54 used in the case of the color patch, the opening 44 of the color measuring device 24 has an arcuate area (E2) (E2) at both ends of the major axis of the ink patch chart 54 during color measurement as shown in FIG. ) Is set to a length that matches the colorimetric pitch of the colorimeter 24.

As shown in FIG. 1, when the colorimeter 24 is moved to a predetermined measurement position above the ink patch chart 54, the opening 44 of the colorimeter 24 and the ink patch chart 54 face each other. In the opposed state, light from the light source 36 exits the opening 44 of the cover 38 and strikes the surface of the ink patch chart 54. Reflected light in the measurement area of the ink patch chart 54 enters the opening 44, passes through the opening 44, passes through the geometry converter 48, enters the detection unit 52, and is detected by the detection unit 52. The spectrum of the reflected light on the surface of is detected. When measuring the saturated ink amount of the print medium 6, as shown in FIG. 4, a plurality of horizontally long ink patch charts 54 are printed on the print medium 6 by combining a single ink color or a combination thereof as required. In the present embodiment, since the ink patch chart is printed in a combination of C, M, Y, K, and CM, CY, MY, CMY, eight are arranged side by side.

The ink patch charts 54 for each color are arranged at equal intervals by changing the density by stepwise changing the ejection amount per unit area of the ink of each color and the combined ink in the vertical direction. The number to be printed may be arbitrarily determined. For example, if printing is performed in a range from 0 to 200%, the number is changed every 5% or every 10%. The ink patch chart 54 of FIG. 4 is printed with the ink ejection amount changed in the vertical direction and different colors in the horizontal direction. The printer 4 automatically and sequentially moves the colorimeter 24 onto these ink patch charts 54, and reads each ink patch chart 54 with the colorimeter 24.

In this embodiment, the reading operation of each ink patch chart 54 is performed at the positions of five points A to E of the ink patch chart 54 as shown in FIG. At the first point A and the fifth point E, the drawing area including the arcuate area (E2) is measured, and at the second to fourth points B to D, the rectangular area (E1) is measured. As shown in FIG. 3, the measurement areas of the circular opening 44 are arranged in a point contact state with no gap in the lateral direction. In the embodiment, the measurement is performed by touching side by side for easy understanding, but the first point A and the fifth point E need to be the places, but the other second to fourth points B to D has no problem in the range where the middle is read, even if it overlaps the side or is far away.

At the measurement position E of the first point A and the fifth point, the arc portion of the opening 44 and the arcuate areas (E2) and (E2) of the ink patch chart 54 are on the axis perpendicular to the plane of the ink patch chart 54. Match. Alternatively, the opening 44 and the arcuate area (E2) overlap so that the opening 44 is disposed in the arcuate area (E2) with a slight gap. At the second to fourth points B to D, the opening 44 makes point contact with the upper side and the lower side of the rectangular area (E1).

The graph of FIG. 3 shows the density data at each point of each ink patch chart 54, and the graph (A) shows the measurement of the ink patch chart 54 in a state where ink overflow (U) exists around the ink patch chart 54. A graph (B) shows measurement data of the ink patch chart 54 in a state where ink overflow does not yet exist.

In this embodiment, based on the colorimetric data detected by the colorimeter 24, the average density measurement of the arcuate areas (E2) and (E2) of the first and fifth points A and E as shown in the graph of FIG. When there is no difference in the average density measurement data of the rectangular areas (E1) of the second to fourth points B to D with respect to the data, it is determined that the ink saturation limit has not been reached, and the graph of FIG. As described above, when the measured densities at the first and fifth points A and E are high and the measured densities at the second to fourth points B to D are low and the difference starts to appear, it is determined that the ink is overflowing. To do.

In the above ink patch chart based on a rectangle, it is possible to take an average after measuring this multiple times. In addition, from the measurement data group, data such as maximum and minimum values, maximum and minimum to several data, maximum values only, maximum to several data, minimum values only, minimum to several data, etc. It is also possible to improve accuracy by taking the average after eliminating. In addition, as data handled in the present embodiment, a spectrum, a Lab color system, or another color system index can be used.

8 to 10 show measurement experiment data of this embodiment, and FIG. 8 shows the lightness at each position of each ink patch chart. Data obtained by measuring two colors mixed and printed, measuring at 10 locations to increase the printing rate from 10% to 200%. Note that the printing rate in the figure is doubled between 5% and 100% because two colors are used, but is 15% to 300% when using three colors. FIG. 9 shows the brightness difference with respect to the printing rate based on the data of FIG. 8, and the arrow indicates the ink limit. The arrows in FIG. 9 indicate that a rising curve is gradually drawn from around the printing rate of 60%, and the basis thereof is shown by the approximate curve of the lightness difference with respect to the printing rate in FIG. In FIG. 8, the difference between the end portion and the intermediate portion is very slight at 55% to 60%, but begins to appear, and when it exceeds a certain portion, the difference disappears. If the part where this difference appears first is determined as an ink limit using statistical calculation or an approximate curve, the arrow part in FIG. 9 draws a rising curve from there, so the ink overflows. It can be judged that there is.

FIG. 5 shows another embodiment of the ink patch chart according to the present invention, in which the width in the short axis direction of the ink patch chart 54 is longer than the diameter of the circular opening 44 to provide a non-measurement area E3. At both ends in the long axis direction, arcuate areas (E2) and (E2) corresponding to the curvature of the circular opening 44, that is, having arcs having a diameter equal to or slightly longer than the diameter of the circle of the opening 44, are provided. Is. Even with such a shape, the measurement data of the drawing area including the high density portion around the ink patch chart 54 ′ where the ink overflow of the ink patch chart 54 ′ is concentrated, and a plurality of less influenced by the surroundings of the ink patch chart. It is possible to accurately detect the measurement data of the drawing area.

In the present invention, as shown in the above embodiment, the ink patch chart has an overall shape that is longer than the shape of the light receiving portion of the sensor, and the ink patch chart has the shape of both sides of the shape of the light receiving portion of the sensor. The same or overlapping side end side area and an intermediate area formed between the side end side areas are configured. In this embodiment, the light receiving portion of the sensor is circular, and this circular shape The shape of the ink patch chart corresponding to the light receiving portion is described, but as shown in FIG. 11, if the light receiving portion 44 is a square shape such as a rectangle or other rectangle, the rectangular ink corresponding to the shape is used. A patch chart 54 ′ may be used, and the same combination as in the above embodiment is possible in the combination of various light receiving portion shapes and corresponding ink patch chart shapes.
FIG. 12 shows another embodiment, because the shape of the light receiving portion 44 and the ink patch chart 54 may be a combination of a portion where the ink density is high and a shape that does not include that portion. Various combinations are possible.

Next, another embodiment of the present invention will be described with reference to FIGS.
FIG. 13 is an explanatory diagram of the internal structure of the spectrophotometer used for the application of the colorimeter 24 used in this embodiment. Since the structure is the same as that shown in FIG.
In the present embodiment, a state in which the ink patch chart 54 is located directly below the opening 44 is illustrated, and in this state, the opening 44 (circular) and the ink patch chart 54 (circular) have the same shape (circular), It shows that they are the same size (diameter).
Next, an operation of reading the ink patch chart 54 printed on the print medium 6 by the colorimeter 24 will be described.
The printer 4 prints the ink patch chart 54 on the print medium 6 as shown in FIG.

The ink patch chart 54 is printed in the same shape as the opening 44 of the colorimeter 24. As shown in FIG. 13, when the colorimeter 24 is moved above the ink patch chart 54, the opening 44 of the colorimeter 24 and the entire drawing area E of the ink patch chart 54 face each other, and the ink patch chart 54. The outline of the circular space of the opening 44 and the outline E of the circular drawing area of the ink patch chart 54 coincide with each other on the axis perpendicular to the plane. In the opposed state, light from the light source 36 exits the opening 44 of the cover 38 and strikes the surface of the ink patch chart 54.

The reflected light of the entire drawing area of the ink patch chart 54 enters the opening 44, passes through the opening 44, passes through the geometry converter 48, enters the detection unit 52, and is detected by the detection unit 52. A spectrum of 54 surfaces is detected. When the saturated ink amount of the print medium 6 is determined, a circular ink patch chart 54 having the same shape as the circular opening 44 of the colorimeter 24 is applied to the print medium 6 as shown in FIG. A combination of these is printed as necessary.

The ink patch charts 54 for each color are arranged at equal intervals in the main scanning direction by changing the discharge amount per unit area of each color ink and the combined ink in a stepwise manner. The number to be printed may be arbitrarily determined. For example, if printing is performed in a range from 0 to 200%, the printing number is changed every 5% or every 10%. The ink patch chart 54 in FIG. 14 is printed with the ejection amount changed in the horizontal direction and different colors in the vertical direction. The printer 4 automatically and sequentially moves the colorimeter 24 on these ink patch charts 54 and reads the ink patch chart 54 with the colorimeter 24. Based on the read data, the computer 16 determines the saturated ink amount. In the present embodiment, the color value gradient between the ink patch charts 54 is calculated by calculating the difference in the level of the ink ejection amount between the ink patch charts 54 based on the color measurement numerical data detected by the colorimeter 24. A point smaller than a predetermined coefficient is calculated and determined as a point where the ink amount is saturated.

In FIG. 14, the circle mark M outside the ink patch chart 54 indicates the opening 44 and the ink patch of the reading unit 24 a of the colorimeter 24 when the colorimeter 24 is manually read by the colorimeter 24. FIG. 6 is an alignment guide diagram for support for aligning the contour of a chart. When the ink patch chart 54 is read manually, the diameter of the ink patch chart 54 may be slightly larger than the diameter of the opening 44 in consideration of an alignment error.
FIG. 15 shows a state in which a high ink density portion in which ink is raised is formed around the contour E or part of the contour E on the printed ink patch chart 54.
In the present invention, attention is paid to a place where the density change such as the first ink rising at the end portion, and the end portion is always read so that more accurate judgment can be made. Is.

In the above description, printing and printing are used in the same meaning. The present invention makes it possible to more accurately determine the ink limit by reliably setting a part of the reading range, such as the contour part of the ink patch chart, which may swell relatively early due to ink overflow. Therefore, even when a combination of various shapes is used, there is no problem as long as the portion can be read.
In the description of the present invention, the shape of the ink patch chart and the shape of the light receiving portion corresponding to the ink patch chart are described as the same. However, within the range not exceeding the gist of the present invention, there is no problem even if the shape is almost the same. .

DESCRIPTION OF SYMBOLS 1 Leg 3 Machine 4 Printer 6 Print medium 8 Conveyance path board 10 Print head 12 Y axis rail 14 Cover 16 Computer 18 Maintenance box 20 Maintenance box 22 Opening / closing cover 24 Colorimeter 26 Stand 27 Plate holder 28 Plate 34 Circuit board 36 Light source 38 Cover 42 Light-shielding partition 44 Opening 46 Filter 48 Geometry converter 52 Detection unit 54 Ink patch chart 54 'Ink patch chart

Claims

Saturation in which an ink patch chart in which the ink discharge amount per unit area is gradually changed is printed on a printing medium, each ink patch chart is read by a sensor, and the saturated ink amount is measured based on the read data In the ink amount measurement method, the saturated ink amount measurement method is characterized in that an area including a dark edge portion of the ink patch chart is read by the sensor.
The ink patch chart has an overall shape that is longer than the shape of the light receiving part of the sensor, and the sensor includes an area including a dark edge portion of the ink patch chart and a thin intermediate area of the ink, respectively. The method for measuring a saturated ink amount according to claim 1, wherein:
The ink patch chart has an overall shape that is longer than the shape of the light receiving portion of the sensor, and the ink patch chart includes a side end side area having a shape that is the same as or overlapping with the shape of both sides of the shape of the light receiving portion of the sensor. 2. The method for measuring a saturated ink amount according to claim 1, comprising an intermediate area formed between the side end side areas.
The shape of the light receiving part of the sensor is circular, the intermediate area of the ink patch chart is a rectangular area, the side end side area is an arcuate area formed on both ends of the rectangular area, and the light receiving part of the sensor 4. The method for measuring a saturated ink amount according to claim 3, wherein the diameter of the circle is the same as the diameter of the arc of the arcuate area or the diameter of the arc is slightly increased.
The shape of the light receiving part of the sensor is circular, and the overall shape of the ink patch chart is configured to have different lengths in the major axis and the minor axis direction, and the minor axis direction is the same as or slightly longer than the diameter dimension of the light receiving part. 4. The saturated ink amount according to claim 3, wherein the major axis direction includes an arcuate area having a radius that is the same as or slightly longer than the radius of the light receiving unit, and a rectangular area having an arbitrary length. Measuring method.
5. The saturated ink amount measuring method according to claim 4, wherein the length of the rectangular area in the minor axis direction is set to be the same as or slightly larger than the diameter of the circle of the light receiving portion of the sensor.
6. The method for measuring a saturated ink amount according to claim 5, wherein the length of the rectangular area in the short axis direction is set larger than the diameter of the circle of the light receiving portion of the sensor.
The shape of the light receiving portion of the sensor is a square, and the side end area of the ink patch chart is a square shape that is the same as or overlaps with the shape of both sides of the square light receiving portion. A method for measuring the amount of saturated ink.
The sensor is a colorimeter that applies light emitted from a light source to a surface of an object to be measured from an opening of a case and guides reflected light reflected from the surface to the optical sensor from the opening to detect reflected light. The method for measuring a saturated ink amount according to claim 2, wherein the light receiving portion of the sensor is an opening of the case of the colorimeter.
The sensor is a spectrophotometer that applies light emitted from a light source to a surface of an object to be measured from an opening of a case and guides reflected light reflected from the surface to the optical sensor from the opening to detect the reflected light. The method for measuring a saturated ink amount according to claim 2, wherein the light receiving part of the sensor is an opening of a case of the spectrophotometer.
2. The saturated ink amount according to claim 1, wherein an area including a dark portion of the ink patch chart and a thin area of ink are respectively measured by the sensor, and a saturated ink amount is determined from a difference between the measured values. Of measuring the amount of saturated ink.
2. The area including the dark edge portion of the ink patch chart is read by the sensor, and the shape of the light receiving portion of the sensor is the same as the shape of the ink patch chart. The method for measuring the saturated ink amount described in 1.
13. The method for measuring a saturated ink amount according to claim 12, wherein the shape of the light receiving portion and the shape of the ink patch chart are circular.
The sensor is a colorimeter that applies light emitted from a light source to a surface of an object to be measured from an opening of a case and guides reflected light reflected from the surface to the optical sensor from the opening to detect reflected light. The method for measuring a saturated ink amount according to claim 12, wherein the light receiving portion of the sensor is an opening of a case of the colorimeter.
The sensor is a spectrophotometer that applies light emitted from a light source to a surface of an object to be measured from an opening of a case and guides reflected light reflected from the surface to the optical sensor from the opening to detect the reflected light. The method for measuring a saturated ink amount according to claim 12, wherein the light receiving portion of the sensor is an opening portion of the case of the spectrophotometer.