JP3735251B2 - Registration mark for printing and registration deviation measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printing registration mark and a registration deviation measuring device used for color registration of a multicolor printed matter, and more specifically, identification and registration deviation amount of each color printing plate during printing or after printing, In addition, the present invention relates to a registration mark that can quickly and accurately determine a registration deviation direction and a registration deviation measuring device thereof.
[0002]
[Prior art]
In a multi-color sheet-fed printing press, each printing plate is wound around a number of plate cylinders corresponding to the number of colors, and printing is performed for each color. At this time, if each color is not sequentially printed at the correct position on one sheet, so-called misregistration occurs, and a good printed product cannot be obtained.
[0003]
Recently, high-definition printing using an FM screen, a high-definition screen, or the like has been performed. However, in such a high-definition printed matter, the alignment accuracy of each plate is as high as about 10 to 20 μm. Accuracy is required, and there is a high demand for automatic detection of misregistration. However, a high-precision alignment requires a measuring device that uses a high-magnification optical system to detect misalignment. In this case, the field of view of the measuring device is inevitably narrow and the measurement range is limited.
[0004]
Conventionally, as registration marks for multi-color printing, registration marks such as crosses and concentrics have been used. Even if the color registration mark is printed, it is difficult to correctly determine which color is in which direction and how much it is misregistered.
[0005]
In addition, these conventional color registration marks are mainly suitable for checking the amount and direction of misalignment by visual inspection or magnifying glass, so they are not suitable for detecting the amount of misalignment or the direction of misalignment of high-definition printed matter. There was also a face.
[0006]
In order to deal with these problems, Japanese Patent Application Laid-Open No. 56-157369 discloses a blank mark having a circular or rectangular outline for the number of colors used in the standard color plate, and for a color plate other than the standard color. A technique is shown in which circles and rectangles having the same size are printed at the same position as the blank mark, and when there is a color shift, the amount and direction of the shift can be easily identified.
[0007]
Japanese Patent Application Laid-Open No. 63-53039 discloses a normal cross-shaped registration mark and a key-shaped registration mark in which each of the four quadrants formed by each line of the cross-shaped registration mark is arranged so that the corner faces the center of the cross. And a device that detects the registration mark and measures the amount of misalignment.
[0008]
Japanese Patent Application Laid-Open No. 7-89064 discloses an apparatus that uses an L-shaped registration mark and moves a detection means so as to cross the vertical and horizontal bars of the mark to detect registration deviation.
[0009]
In Japanese Patent Laid-Open Nos. 8-838022 and 8-224862, a reference color is used to print a cross pattern, a polygonal pattern, or a horizontal line and a vertical line separating the horizontal line for the number of color plates used for printing. Print a square or polygon pattern of a color other than the reference color between the lines of each pattern, and specify how far the square or polygon is from the reference color line segment. A register mark for detecting a shift is shown.
[0010]
[Problems to be solved by the invention]
However, in Japanese Patent Laid-Open No. 56-157369, blank marks of (total number of colors-1) must be provided, and as the number of colors increases, the area occupied by the registration marks increases. In general, it is necessary to provide printing space for product names, color separation gradation scales, automatic registration marks, etc. in the margins of both ears on the original printing plate, and this space is insufficient when the pattern repetition cycle is short There is a problem of doing. Although this method may be optimal for visually confirming the misregistration direction, it is difficult to accurately measure the misalignment direction and amount.
[0011]
In addition, in Japanese Patent Laid-Open No. 63-53039, since the center cross mark is printed in each color, the cross mark becomes fat when there is a slight misalignment, and it is difficult to obtain an accurate center position. In the case of misalignment where the cross and the key overlap, it becomes difficult to measure both separately.
[0012]
Japanese Patent Application Laid-Open No. 7-89064 merely shows a device that detects a registration deviation mark and calculates a deviation amount, and after the detection means crosses all the color registration marks vertically and horizontally. Otherwise, the amount of deviation and direction cannot be calculated, and the amount of deviation cannot be detected quickly.
[0013]
Further, the methods disclosed in Japanese Patent Application Laid-Open Nos. 8-838022 and 8-224862 are such that a square or polygon other than the reference color is printed over the reference color line. In some cases, it is difficult to separate with a dark color, and an accurate shift amount may not be detected.
[0014]
In view of the above-described circumstances, the present invention can measure the misregistration quickly with high accuracy, and can accurately measure the misregistration amount so that the registration mark element of the reference color and the mark element for measuring the misregistration amount do not overlap. It is an object to provide a registration mark for printing and a registration deviation measuring device thereof.
[0015]
[Means for Solving the Problems]
  In order to solve the above problem, the invention described in claim 1
  In register marks for detecting misregistration of each color in multicolor printing,
  A register mark element group having a different shape corresponding to each color used in printing, and each colorofThe register mark elementRegisterIt is possible to detect the amount of misregistration of each color based on the position of the registration mark element of the standard color by connecting the line segments with different thicknesses or lengths for each mark element at the end points at a fixed angle. It is characterized by that.
[0016]
By configuring the registration mark in this way, if the amount of misregistration of each color in the registration mark is measured, the amount of misregistration of all colors can be measured, and the misregistration can be measured quickly with high accuracy.
[0017]
  And the invention described in claims 2, 3, 4
  The aboveThis maThis is made by connecting line segments with different thicknesses or lengths for each key element at the end points at a fixed angle.Register mark elementsIt is characterized in that each end point is arranged in a circular shape at equal intervals so as to be a constant distance from the center.
  The coupling angle of the line segment of the register mark element is substantially a right angle.
  One of the line segments in the register mark element is provided so as to be substantially parallel to the printing flow direction of the printing press.
[0018]
In this way, if the line segments constituting the register mark element are intersected at right angles and one line segment is parallel to the printing flow direction of the printing press, the jagged lines (diagonal lines become dots generated when printing obliquely). The step-like jaggedness that occurs when expressed in (3) does not appear, and more accurate positional deviation measurement is possible.
[0019]
In this case, if the number of colors used for printing exceeds four colors, as described in claim 5,
The number of register marks is set so that all colors are assigned to register mark elements when the colors used for printing exceed four colors.
[0020]
By doing in this way, even if the printing color exceeds four colors, all the registration deviations can be measured by measuring a small number of registration marks.
[0021]
  In addition, with the register mark configured as described above, all register mark elements need to fall within the same field of view in order to measure the register shift of all colors, but may not enter if the amount of misalignment is large. . The register mark in that case is as described in claim 6.
  In register marks for detecting misregistration of each color in multicolor printing,
  Claim 1Or 2DescribedFor printingThe registration mark is a first registration mark, and a reference color registration mark element arranged in the center;Standard color registerAround the mark elementOf the same color other than the reference colorA register mark composed of comparative register mark elements,Register mark prepared for colors other than the standard color as the second register mark, The first register mark and the second register markIt is characterized by combining register marks.
[0022]
  By configuring the second register mark in this way, one of the comparative register mark elements arranged around the reference color register mark element is used as the reference color register mark element regardless of the direction of color misalignment. Since the shift is in the approaching direction, measurement is possible even if the shift amount is large. Further, by using the register mark together with the register mark described in claim 1 and adjusting the interval between the register mark elements and the reference color register mark element and the comparative examination mark element,MasterEven in the case of misalignment, the other register mark element can be prevented from overlapping, so accurate measurement is possible.
  Therefore, the invention according to claim 10 is a registration deviation measuring method for detecting registration deviation of each color in multicolor printing by a registration deviation measuring device.
  Claim 6A register mark for printingIf the registration is such that all the elements of the first registration mark are within the field of view of the misregistration measuring device, only the first registration mark is used.All the elements of the first registration mark areIf there ’s a large misalignment that does n’t fit in the field of view,Only the color that does not fall within the field of view of the measuring device among the elements of the first registration mark can be detected by the second registration mark,
  Meanwhile, the first registerMark elementMutualWhen measurement is not possible due to overlappingIfOnly the color can be detected by the second register mark.
[0023]
  And thisLook atEven in this mark, as described in claims 7 and 8,
  SaidSecond register markThe end points of the comparative register mark elements are arranged at equal distances from the central reference color register mark and at equal intervals from each other.
  SaidSecond register markThe comparative register mark element is composed of line segments orthogonal to each other at the end points, and one of the line segments is provided so as to be substantially parallel to the printing flow direction of the printing press.
[0024]
  in this waySecond register markLines that make up the register mark element intersect at right angles, and one line segment is parallel to the printing flow direction of the printing machine. In this case, stepped jagged edges) that occur in some cases do not appear, and a more accurate positional shift can be measured.
[0025]
  Further, in order to measure the registration deviation from the registration mark configured as described above, the invention described in claim 9 is
  A two-dimensional area sensor that detects a registration mark of a printed material and measures a registration deviation of a print color, and moves the two-dimensional area sensor in a two-dimensional direction2D movementIn a registration deviation measuring device that measures the registration deviation of the registration mark at the measurement position,
  For printing according to claim 1 or 2Use printed materials with register marksThe aboveA pattern storage unit for storing the registration mark and the two-dimensional area sensor by a two-dimensional moving meansTo the position where the registration mark can be imagedA pattern matching unit for matching the image pattern detected by the two-dimensional area sensor with the registration mark stored in the pattern storage unit, and a reference of the registration mark on the printed matter detected by the pattern matching unit; BecomeRegisterBased on the position of the mark element,Register for each colorIt has a control unit that detects the misregistration of the mark element, and becomes the reference detected by the two-dimensional area sensorRegisterEach color based on the position of the mark elementEvery registerMark requiredRawIt is characterized by measuring misregistration.
[0026]
By configuring the registration deviation measuring apparatus in this way, the registration deviation can be quickly measured with high accuracy.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. This is just an example.
[0028]
FIG. 1 is a diagram for explaining the configuration of a printing register mark according to the present invention, FIGS. 2 and 3 are detailed explanatory diagrams of two types of marks constituting the printing register mark of the present invention, and FIG. It is explanatory drawing when each color raise | generates registration shift. FIGS. 1 to 4 illustrate the case where the colors used for printing are four colors Y (yellow), M (magenta), C (cyan), and K (black) as an example. As described above, the present invention is not limited to four colors but can be applied to printing of many colors including special colors.
[0029]
  In the figure, 1 is the first register mark, 2₁2₂2₃Is a second register mark. In the present invention, the first register mark and the second register mark are combined, and in the case of a register misalignment that allows all the elements of the first register mark to fall within the field of view of the measuring device. If there is a misalignment that is too large to fit within the field of view with only the first register mark,OrWhen the mark elements are overlapped and cannot be measured, only the color can be detected by the second register mark.
[0030]
Among these, the first register mark is composed of four register mark elements 3, 4, 5, and 6 having different shapes as shown in FIG. 2, and these elements are circular at a predetermined distance r from the center 20. Arranged at regular intervals. The first register mark is a separate color used for printing by each register mark element 3, 4, 5, 6; for example, in the case of four colors, 3 is black, 4 is cyan, 5 is yellow, 6 is The magenta is printed, and the darkest color, 3 black, is used as a reference element for misregistration measurement. The register mark elements 3, 4, 5, 6 shown in FIG. 2 have a narrower line width than 4, 5 has a shorter horizontal line length in the figure, and 6 also has a horizontal line as 5. Although the reverse is shown as being shortened, these are only examples, and any shape may be used as long as they are associated with each color.
[0031]
The second register mark is a comparison between the reference color register mark element 30 placed in the center as shown in FIG. 3 and the same shape arranged at equal intervals in a circle at a predetermined distance R from the mark element 30. The registration mark elements 7, 8, 9, and 10 are configured. The reference color register mark element 30 placed at the center is printed in the darkest color among the colors used for printing, for example, black (B) in this case, and arranged around the reference color registration mark element 30. The comparative register mark elements 7, 8, 9, and 10 have the same color other than the reference color.
[0032]
As shown in FIG. 1, the second registration marks are prepared by subtracting 1 from the number of colors used for printing, and the comparative registration mark elements are printed in different colors for each registration mark. That is, as described above, when four colors of black, cyan, yellow, and magenta are used for printing, and the reference color is black, for example, 2₁The comparative register mark element in₂In yellow, 2₃Is printed in magenta.
[0033]
Note that the registration mark for printing in the present invention is configured to be very small and high-definition so that the positional deviation of the high-definition printed matter can be detected with high accuracy as described above. That is, for example, as an example, the first registration mark in FIG. 2 has a height and width of 0.6 mm as shown in FIG. 2, and the second registration mark in FIG. One side is 0.1 mm, and the overall height and width are each about 1 mm. By configuring the registration mark to be small and high-definition in this way, the entire mark can be accommodated within the field of view even when a high-magnification optical system is used, and the amount of registration deviation can be detected with high accuracy.
[0034]
Further, as can be seen from the configuration of the second register mark, any of the four comparative register mark elements 7, 8, 9, 10 approaches the central reference color register mark element 30 even if the amount of misalignment is large. Therefore, even if the field of view is small, it is possible to measure the misregistration. Therefore, as can be seen from FIGS. 2 and 3, the size of the first register mark and the second register mark is such that the second register mark is larger than the first register mark.
[0035]
FIG. 4 is an explanatory diagram for detecting a color misregistration amount using the printing registration mark of the present invention configured as described above. In the figure, reference numeral 40 denotes a first registration mark 1 and a second registration mark 2 which are automatically generated by the registration deviation measuring device.₁2₂2₃The position detection mark provided so that the position detection mark 40 can be detected in advance.₁2₂2₃Remember the distance to. In addition, the figure indicated by the dotted line in each mark indicates the position where each mark should be printed when there is no color misregistration. This first register mark 1 when printing is performed without color misregistration. The distance between the register mark elements in and the second register mark 2₁2₂2₃The distance between the reference color register mark element and the comparative register mark element is also remembered.
[0036]
Currently, the colors used for printing are black, cyan, yellow, and magenta, as described above, the register mark element 3 in the first register mark 1 is black, 4 is cyan, 5 is yellow, 6 Is printed in magenta, and the reference color of registration is black. Then, for example, the yellow mark 5 is x in the X direction from the position to be originally printed as shown in the figure.₁Y in the Y direction₁Assuming that the printing is shifted by only a distance, the reference distance from black 3 to yellow 5 is stored in advance in the measuring device as described above.₁, Y₁Is the amount of deviation of the yellow register mark element 5 as it is.
[0037]
Similarly, in the second registration mark, as described above, the reference color registration mark element 30 in which one of the four comparative registration mark elements 7, 8, 9, 10 is located at the center even if the amount of deviation is large. For example, 2₁The color of the comparative registration mark element in the first registration mark is set to cyan, and the comparative registration mark element 8 closest to the reference color registration mark element 30 located at the center is x in the X direction from the position coordinate to be originally printed.₂Y in the Y direction₂When printing is performed with a shift of only this amount, this value is the cyan shift amount as it is.
[0038]
As described above, by using the first registration mark or the second registration mark, the amount of misregistration of the color used for printing is clarified. However, these two marks have the size of the misregistration amount. Use properly. That is, the field of view of a high-precision optical system of a registration deviation measuring apparatus to be described later is about 1 mm, but the first registration mark has a size of about 0.6 mm in length and breadth as shown in FIG. 2 as an example. . For this reason, if the amount of misregistration of the four colors is within the field of view of this measuring device, all the misregistration amounts can be measured with the first registration mark shown in FIG. In some cases, the first register mark cannot be measured.
[0039]
In this case, the amount of color misalignment that could not be measured with the first registration mark is measured with the second registration mark. That is, in the second register mark, the comparative register mark elements 7, 8, 9, and 10 having a color different from the reference color are arranged around the center reference color register mark element 30. Even if is large, one of the comparative examination mark elements is close to the reference color register mark element and can be accommodated in the field of view. Therefore, measurement is possible even if the amount of deviation is large.
[0040]
In the above description, the number of colors used for printing is four, and the number of unit graphics in each of the first and second register marks is four. However, in general, in multicolor printing, only four colors are used. Not limited to this, a specific color such as skin color or gold color is used as a special color, and a large number of colors such as five colors, six colors, seven colors, etc. are used. When five or more colors are used as described above, the present invention has the following three types of countermeasures.
[0041]
The first is that both the first register mark and the second register mark have the shapes shown in FIGS. 2 and 3, and when there are five or more colors, the number of the first register marks is increased and all colors used for printing are used. It is a method to be able to be assigned. In such a case, the number of the first register marks increases, but as is apparent from FIGS. 2 and 3, the line segments of the register mark elements and the comparative examination mark elements constituting both register marks intersect at right angles. If one of these is printed so that it is parallel to the printing flow direction of the printing machine, there will be no jaggedness that occurs when printing diagonally (step-like jaggedness that occurs when diagonal lines are represented by dots), and more accurate Measurement of positional deviation becomes possible.
[0042]
In the second method, the number of register mark elements in the first register mark is set to the number of colors used for printing as shown in FIG. 5, and the second register mark is as shown in FIG. In this case, as shown in FIG. 5, the registration mark element of the first registration mark is formed as a registration mark element 52 by joining two line segments 50 and 51 at end points with a certain angle. As indicated by reference numerals 53 to 57, the mark elements are formed by changing the shape (thickness and length of the line) with a constant line segment angle. By aligning the registration mark elements with each other at a certain distance, the positional deviation can be detected without increasing the number of the first registration marks. However, in this case as well, the second registration mark is required for the amount excluding the reference color.
[0043]
The third method uses the first registration mark as shown in FIG. 5, and the second registration mark uses a comparative examination mark element having the same shape as that of the first registration mark as shown in FIG. In this method, the central reference color register mark element is also a polygon having the same number of sides as the number of the comparative examination mark elements around. In this way, when the amount of misalignment is large, the number of comparative examination mark elements that enter the field of view increases, and measurement can be performed more easily.
[0044]
The above is the details of the printing registration mark in the present invention. Hereinafter, a registration deviation measuring apparatus for detecting the printing deviation amount of each color from the registration mark will be described with reference to FIG.
[0045]
The lower part of FIG. 7 is a schematic perspective view of the apparatus showing the form of the registration deviation measuring apparatus of the present invention, and the control block diagram is shown in the upper part. In the figure, reference numeral 70 is a registration deviation measuring device, 71 is a table for placing printed matter, 72 is printed matter, 73 is a registration mark printed on the printed matter as described in FIG. 1, 74 is a positioning pin for printing paper, 75 Is a two-dimensional area sensor composed of a CCD area sensor or the like for imaging a two-dimensional range, which has a high magnification optical system as described above and images a range of about 1 × 1 mm on a printed matter, It consists of two types, one that images a wide range of about 20 × 20 mm. Reference numeral 76 denotes a measuring device such as a laser displacement meter for measuring a distance (height) between the two-dimensional area sensor 75 and the printed material 72. The laser light of the laser displacement meter is also used as a laser pointer indicating the measurement position.
[0046]
77 denotes a Z-axis stage 78 having a step motor and a ball screw and moving in the Z-axis direction to adjust the distance (height) between the measurement device 76 such as a two-dimensional area sensor 75 and a laser displacement meter and the printed material 72; A moving table 79 for moving the measuring apparatus and the Z-axis stage 77 together, 79 is a high-accuracy position detecting device such as a motor that drives a ball screw that moves the moving table 78 in the X-axis direction and a rotary encoder that performs position detection. An X-axis drive device having 80, a Y-axis drive device having a high-accuracy position detection device such as a rotary encoder that performs position detection and a motor that drives a ball screw that is also moved in the Y-axis direction, and 81 is an XYZ-axis motor 82 is a rotary encoder included in the X-axis drive device 79 and the Y-axis drive device 80. The coordinate calculation unit 83 detects the current position of the measurement unit on the moving table 78 based on the signal from the, and 83 calculates the distance (height) between the two-dimensional area sensor 75 and the printed material 72 based on the signal from the laser displacement meter 76. The height detection unit 84 includes the coordinates of the position detection mark 40 shown in FIG. 4, the distances from the position detection mark 40 to the first registration mark and the second registration mark, and the marks in the respective registration marks. A coordinate storage unit that stores the distance between elements, 85 is a control unit, and 86 stores the shape of the mark element in the first register mark shown in FIG. 2 and the second register mark shown in FIG. A pattern storage unit 87 performs pattern matching for matching the image pattern detected by the two-dimensional area sensor 75 and the shape of the registration mark stored in the pattern storage unit 86. , 88 is a moving amount and direction instructing section that instructs a moving direction and the moving amount of the moving table 78 which holds the measuring device, the like arrow keys or a joystick. Reference numeral 89 denotes an input device such as a keyboard, and reference numeral 90 denotes a display device that displays a registration mark and a shift amount.
[0047]
In order to measure the amount of misregistration with the misregistration measuring apparatus configured as described above, first, the printed material 72 is positioned and placed on the table 71 of the misregistration measuring apparatus 70 by the positioning pins 74 of the printing paper. Then, the movement amount / direction instructing unit 88 instructs the moving table 78 to move so that the laser light from the laser displacement meter 76 indicates the position of the position detection mark 40 in FIG. Then, the control unit 85 instructs the motor driving unit 81 to instruct the X-axis driving device 79 and the Y-axis driving device 80 to move the moving table 78 to the instructed position.
[0048]
When the laser beam of the laser displacement meter 76 indicates the position of the position detection mark 40 in FIG. 4, the distance between the position detection mark 40 and the first registration mark as described above, and the laser displacement meter 76 Since the distance from the position of the laser beam to the two-dimensional area sensor 75 is stored in advance in the coordinate storage unit 84, the control unit 85 reads this value from the coordinate storage unit 84 and further sends an instruction to the motor drive unit 81. The two-dimensional area sensor 75 moves the moving table 78 to a position where the first registration mark in FIG. 4 can be imaged.
[0049]
Then, the distance (height) to the printed material 72 is measured by the laser displacement meter 76, and the result is sent to the height detector 83 to detect the height from the printed material 72 to the two-dimensional area sensor 75. The result is sent to the control unit 85. If the height is not suitable for the registration deviation measurement, a signal is further sent to the motor drive unit 81, and the step motor of the Z-axis stage 77 is driven to measure the registration deviation. It is adjusted to the optimum height.
[0050]
When the preparation for the registration deviation measurement is thus completed, the control unit 85 causes the two-dimensional area sensor 75 to capture the first registration mark 1 as shown in FIG. 4 and sends the image to the pattern matching unit 87 and the control unit 85. Display on the display device 90. The pattern matching unit 87 matches the first registration mark stored in the pattern storage unit 86 with the registration mark elements 4, 5, 6, and 7 shown in FIG. take. When the position of the registration mark element is detected, the control unit 85 determines the position of the registration mark element 3 of the reference color and the distance to the other registration mark elements 4, 5, 6 stored in the coordinate storage unit 84. Thus, the position coordinates where these register mark elements should be printed are calculated, the distances from the position coordinates to the register mark elements 4, 5, 6 of other colors are measured, and this is displayed as the amount of misalignment. It is displayed on the device 90.
[0051]
In this way, the registration deviation measurement by the first registration mark is performed. As described above, the registration deviation is large, and the unit graphics of all colors in the first registration mark fall within the field of view of the two-dimensional area sensor 75. If not, the pattern matching unit 87 informs the control unit 85 of the color that was not in this field of view.
[0052]
Then, the control unit 85 sends a movement instruction to the motor driving unit 81 so that the two-dimensional area sensor 75 is positioned at the position of the second registration mark corresponding to the color that is not in the field of view, and moves the table 78. Then, the two-dimensional area sensor 75 images the second registration mark as shown in FIG. 4, but this second registration mark is at the center even if the amount of deviation is somewhat large as described above. One of the comparative examination mark elements around the reference color register mark element 30 always enters the field of view.
[0053]
Therefore, as in the case of the first registration mark, the control unit 85 adjusts the Z-axis stage 77 to an optimum height for measurement of the registration shift, and causes the two-dimensional area sensor 75 to image the second registration mark, thereby pattern matching unit. 87, and the display device 90 displays the information through the control unit 85. Then, the pattern matching unit 87 includes the reference color register mark element 30 and the comparative examination mark elements 7, 8, 9, and 10 of the second register mark stored in the pattern storage unit 86, and the printed material 72 that has been imaged. Matching with the second register mark is performed to determine the position coordinates of the reference color register mark element 30 and to determine which comparison mark element is imaged.
[0054]
Then, the control unit 85 reads the distance data between the reference color register mark element 30 and the comparative examination mark element stored in the coordinate storage unit 84, calculates the coordinates where the comparative examination mark element should be printed, and The distance from the coordinate position to the comparative examination mark element being imaged is measured, and this is displayed on the display device 90 as a positional deviation amount.
[0055]
When the second registration mark is too large to be within the field of view of the two-dimensional area sensor 75, as described above, the two-dimensional area sensor 75 has a low magnification that captures a wide range of about 20 × 20 mm. Since there are some, the measurement as described above is performed using this low-magnification sensor, and after the amount of deviation is converged to some extent, high-precision measurement is performed.
[0056]
By configuring the registration deviation measuring apparatus in this way, registration deviation in multicolor printing can be measured easily and with high accuracy.
[0057]
In the above description, the position detection mark 40 has been described to be instructed by the movement amount / direction instructing unit 88. However, this is configured so that the numerical value is input beforehand from the input device 89 and automatically measured. May be. Further, since the measurement of registration deviation is performed several times during printing, this position may be stored in the coordinate storage unit 84 and automatically searched by the two-dimensional area sensor 75.
[0058]
【The invention's effect】
As described above, according to the present invention, the first misregistration that the first register mark falls within the field of view of the register measuring device is the first register mark, and the misregister that does not fit within the field of view is the second register mark. Since it is detected, the registration deviation can be measured quickly with high accuracy. If the registration marks overlap with each other in the first registration mark, the measurement can be performed with the second registration mark. The amount can be measured accurately.
[0059]
Also, when printing diagonally by crossing the line segments of the basic figure constituting the register mark at right angles and printing so that the line segments constituting the basic figure are parallel to the printing flow direction of the printing press The generated jaggedness (the stepped jaggedness that occurs when the diagonal line is expressed by dots) does not appear, and more accurate positional deviation measurement is possible.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a configuration of a printing register mark according to the present invention.
FIG. 2 is a diagram for explaining details of a first register mark in the present invention.
FIG. 3 is a diagram for explaining details of a second register mark in the present invention.
FIG. 4 is an explanatory diagram in a case where each color is misregistered.
FIG. 5 is a diagram for explaining details of another embodiment of the first register mark according to the present invention.
FIG. 6 is a diagram for explaining details of another embodiment of the second register mark according to the present invention.
FIG. 7 is a block diagram of a registration deviation measuring apparatus according to the present invention.
[Explanation of symbols]
1 First register mark
2 Second register mark
3, 4, 5, 6 Register mark element
7, 8, 9.10 Comparative study mark element
30 Standard color register mark element

Claims (10)

In register marks for detecting misregistration of each color in multicolor printing,
Together comprise a register mark element groups having different shapes to correspond to each color to be used for printing, said the register mark elements of each color, with different said register mark elements each to the thickness or length, the line A registration mark for printing, wherein the registration marks are configured by combining minutes at end points at a fixed angle so that the amount of misregistration of each color can be detected based on the position of the registration mark element of the reference color.   Register mark elements formed by connecting line segments with different thicknesses or lengths for each of the register mark elements at the end points at a constant angle are arranged at equal intervals in a circle so that each end point is a constant distance from the center. The register mark for printing according to claim 1, wherein the register mark is for printing.   The registration mark for printing according to claim 2, wherein a joining angle of line segments of the registration mark element is substantially a right angle.   The printing registration mark according to claim 3, wherein one of the line segments in the registration mark element is provided so as to be substantially parallel to a printing flow direction of the printing press.   5. The register mark for printing according to claim 4, wherein the number of register marks is set so that all colors are assigned to register mark elements when colors used for printing exceed four colors. In register marks for detecting misregistration of each color in multicolor printing,
The printing register mark according to claim 1 or 2 is used as a first register mark, and a reference register of a reference color register mark element arranged at the center and a reference color other than the reference color arranged around the reference color register mark element the register marks consist of a mark element group, the register mark prepared for the color other than the reference color as a second register mark, that by combining the register mark of the first register mark and the second A special register mark for printing. The end point of comparison register mark elements of the second register mark, equidistant from the reference color register mark elements, and registration for printing according to claim 6, characterized in that arranged as each other at equal intervals mark.   7. The comparative register mark element of the second register mark is constituted by a line segment orthogonal at an end point, and one of the line segments is provided so as to be substantially parallel to the printing flow direction of the printing press. Or the register mark for printing described in 7. A two-dimensional area sensor that detects a registration mark of a printed matter and measures a registration deviation of a print color, and a two-dimensional movement unit that moves the two-dimensional area sensor in a two-dimensional direction, and registration of the registration mark at the measurement position In the misregistration measuring device that measures
Using a printed matter having a printing register marks according to claim 1 or 2, wherein a pattern storage unit that stores the register mark, after the register mark is moved to the position which allows imaging a two-dimensional movement means the two-dimensional area sensor A pattern matching unit for matching the image pattern detected by the two-dimensional area sensor with the registration mark stored in the pattern storage unit, and a registration mark element serving as a reference for the registration mark on the printed matter detected by the pattern matching unit position based on, having a control unit for detecting the register movement register mark elements for each color, the position of each based on the color registration mark of elements of register mark elements two-dimensional area sensor as a reference detected A registration deviation measuring device characterized by measuring a registration deviation. In the misregistration measurement method for detecting the misregistration of each color in multicolor printing with the misregistration measuring device,
Print the print registration mark according to claim 6, in the case of the degree of register movement of all elements of the register mark of the first to enter into the field of view of the misregistration measuring device only the first register mark, the first If there is a large misregistration that does not allow all the elements of the registration mark to fall within the field of view of the misregistration measuring apparatus, only the colors that do not fall within the field of view of the measuring apparatus among the elements of the first registration mark So that it can be detected with the mark,
Meanwhile, the first register mark between elements can not be measured overlap case, the register movement measuring method is characterized in that to be able to detect at the only that color the second register mark.

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