JP2020163577A - Register control unit and multicolor printing system - Google Patents

Register control unit and multicolor printing system Download PDF

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JP2020163577A
JP2020163577A JP2019063518A JP2019063518A JP2020163577A JP 2020163577 A JP2020163577 A JP 2020163577A JP 2019063518 A JP2019063518 A JP 2019063518A JP 2019063518 A JP2019063518 A JP 2019063518A JP 2020163577 A JP2020163577 A JP 2020163577A
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light
register mark
wavelength
web
wavelength range
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JP7222785B2 (en
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大介 平山
Daisuke Hirayama
大介 平山
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Sumitomo Heavy Industries Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/04—Tripping devices or stop-motions
    • B41F33/14—Automatic control of tripping devices by feelers, photoelectric devices, pneumatic devices, or other detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

To provide a technique capable of precisely detecting a register mark printed on a light-transmissive web.SOLUTION: A register control unit 20 detects a register mark printed on a light-transmissive web 2. The register control unit 20 comprises: a light source 32 which irradiates the web 2 with light; a background part which is irradiated with light from the light source 32 which has been transmitted through the web 2; and a light receiving element 34 which receives light from the light source 32 which has been reflected by the register mark and background part. The light source 32 irradiates the web with the light having a wavelength within a sensitivity wavelength range of the light receiving element 34. One of the register mark and background part has a color having a wavelength within the sensitivity wavelength range, and the other has a color having a wavelength outside the sensitivity wavelength range.SELECTED DRAWING: Figure 2

Description

本発明は、見当制御ユニットおよび多色刷印刷システムに関する。 The present invention relates to a register control unit and a multicolor printing system.

被印刷媒体であるウェブの搬送路に沿って複数の印刷ユニットを設置し、各印刷ユニットに設けられた版胴を個別に回転駆動し、ウェブに順次印刷を施す多色刷印刷システムが知られている。多色刷印刷システムでは、各印刷ユニットでウェブに印刷された見当マークを検出し、その検出結果に基づき各版胴間で生じる印刷位置のずれを制御する。 A multicolor printing system is known in which a plurality of printing units are installed along a transport path of a web as a printing medium, and the plate cylinders provided in each printing unit are individually rotated and driven to sequentially print on the web. .. In the multicolor printing system, each printing unit detects a register mark printed on the web, and based on the detection result, controls the deviation of the printing position between the plate cylinders.

特許文献１は、透光性を有するウェブに印刷された見当マークを検出するための技術を開示する。特許文献１では、ウェブを挟んでセンサと対向するように反射板を設け、センサの発光部が光を照射し、見当マークで反射した反射光あるいはウェブを透過して反射板で反射した反射光をセンサの受光部で受光し、見当マークで反射されたときの反射光と反射板で反射されたときの反射光との強度差に基づいて見当マークを検出する。 Patent Document 1 discloses a technique for detecting a register mark printed on a translucent web. In Patent Document 1, a reflecting plate is provided so as to face the sensor with the web in between, and the light emitting portion of the sensor irradiates light, and the reflected light reflected by the register mark or the reflected light transmitted through the web and reflected by the reflecting plate. Is received by the light receiving portion of the sensor, and the register mark is detected based on the intensity difference between the reflected light when reflected by the register mark and the reflected light when reflected by the reflecting plate.

特開２００７−０２１７４３号公報JP-A-2007-021743

照射光の色と見当マークの色の組み合わせによっては、見当マークが比較的強い反射光を返す。この場合、特許文献１の技術では、見当マークからの反射光と反射板からの反射光との強度差が小さくなり、見当マークを精度良く検出できない。対策として、見当マークが比較的弱い反射光を返すように照射光の色を切り替えることも考えられるが、センサの構造上、切り替えられる照射光の色は数色程度であり、見当マークの色によっては対応できない。 Depending on the combination of the color of the irradiation light and the color of the register mark, the register mark returns relatively strong reflected light. In this case, in the technique of Patent Document 1, the intensity difference between the reflected light from the register mark and the reflected light from the reflector becomes small, and the register mark cannot be detected accurately. As a countermeasure, it is conceivable to switch the color of the irradiation light so that the register mark returns relatively weak reflected light, but due to the structure of the sensor, the color of the irradiation light that can be switched is only a few colors, depending on the color of the register mark. Cannot handle.

本発明はこうした状況に鑑みてなされたものであり、そのある態様の例示的な目的のひとつは、透光性を有するウェブに印刷された見当マークを精度良く検出できる技術を提供することにある。 The present invention has been made in view of such circumstances, and one of an exemplary purpose of the embodiment is to provide a technique capable of accurately detecting a register mark printed on a translucent web. ..

上記課題を解決するために、本発明のある態様の見当制御ユニットは、透光性を有するウェブに印刷された見当マークを検出するための見当制御ユニットであって、ウェブに向けて光を照射する光源と、ウェブを透過した光源からの光が照射される背景部と、見当マークおよび背景部で反射された光源からの光を受光する受光素子と、を備える。光源は、受光素子の感度波長範囲内の波長を有する光をウェブに照射し、見当マークおよび背景部の一方は、感度波長範囲内の波長の色であり、他方は感度波長範囲外の波長の色である。 In order to solve the above problems, the register control unit according to an aspect of the present invention is a register control unit for detecting a register mark printed on a transparent web, and irradiates light toward the web. It includes a light source to be used, a background portion to which light from a light source transmitted through the web is emitted, and a light receiving element for receiving light from a light source reflected by a register mark and the background portion. The light source irradiates the web with light having a wavelength within the sensitivity wavelength range of the light receiving element, one of the register mark and the background portion is a color having a wavelength within the sensitivity wavelength range, and the other is a wavelength outside the sensitivity wavelength range. The color.

本発明の別の態様もまた、見当制御ユニットである。この見当制御ユニットは、透光性を有するウェブに印刷された見当マークを検出するための見当制御ユニットであって、ウェブに向けて光を照射する光源と、ウェブを透過した光源からの光が照射される背景部と、見当マークおよび背景部で反射された光源からの光を受光する受光素子と、を備える。光源は、受光素子の感度波長範囲内の波長を有する光をウェブに照射し、見当マークおよび背景部の一方は、光源が照射する光の波長域内の色であり、他方は波長域外の色である。 Another aspect of the invention is also a register control unit. This register control unit is a register control unit for detecting a register mark printed on a translucent web, and a light source that irradiates light toward the web and light from a light source that has passed through the web are emitted. It includes a background portion to be irradiated, a register mark, and a light receiving element that receives light from a light source reflected by the background portion. The light source irradiates the web with light having a wavelength within the sensitivity wavelength range of the light receiving element, and one of the register mark and the background portion is a color within the wavelength range of the light emitted by the light source, and the other is a color outside the wavelength range. is there.

本発明のさらに別の態様は多色刷印刷システムである。この多色刷印刷システムは、上述の見当制御ユニットを備える。 Yet another aspect of the present invention is a multicolor printing system. This multicolor printing system includes the registration control unit described above.

なお、以上の構成要素の任意の組み合わせや、本発明の構成要素や表現を方法、装置、システムなどの間で相互に置換したものもまた、本発明の態様として有効である。 It should be noted that any combination of the above components and those in which the components and expressions of the present invention are mutually replaced between methods, devices, systems and the like are also effective as aspects of the present invention.

本発明によれば、透光性を有するウェブに印刷された見当マークを精度良く検出できる。 According to the present invention, a register mark printed on a translucent web can be detected with high accuracy.

実施形態に係る多色刷印刷システムの構成を示す図である。It is a figure which shows the structure of the multicolor printing system which concerns on embodiment. 図１の見当制御ユニットの機能および構成を示すブロック図である。It is a block diagram which shows the function and structure of the register control unit of FIG. 図２の第１センサの光源が照射する光の波長と、図２の第１センサの受光素子の感度波長範囲との関係の一例を示す図である。It is a figure which shows an example of the relationship between the wavelength of the light which the light source of the 1st sensor of FIG. 2 irradiates, and the sensitivity wavelength range of the light receiving element of the 1st sensor of FIG. 図２の第１センサの光源が照射する光の波長と、図２の第１センサの受光素子の感度波長範囲との関係の別の例を示す図である。It is a figure which shows another example of the relationship between the wavelength of the light which the light source of the 1st sensor of FIG. 2 irradiates, and the sensitivity wavelength range of the light receiving element of the 1st sensor of FIG.

以下、本発明を好適な実施の形態をもとに図面を参照しながら説明する。各図面に示される同一または同等の構成要素、部材、処理には、同一の符号を付するものとし、適宜重複した説明は省略する。また、実施の形態は、発明を限定するものではなく例示であって、実施の形態に記述されるすべての特徴やその組み合わせは、必ずしも発明の本質的なものであるとは限らない。 Hereinafter, the present invention will be described with reference to the drawings based on preferred embodiments. The same or equivalent components, members, and processes shown in the drawings shall be designated by the same reference numerals, and redundant description will be omitted as appropriate. Further, the embodiment is not limited to the invention but is an example, and all the features and combinations thereof described in the embodiment are not necessarily essential to the invention.

図１は、実施の形態に係る多色刷印刷システム１００の構成を示す図である。多色刷印刷システム１００は、第１印刷ユニット１０Ａ、第２印刷ユニット１０Ｂと、見当制御ユニット２０と、を備える。第１印刷ユニット１０Ａおよび第２印刷ユニット１０Ｂはそれぞれ、版胴１１と、圧胴１２と、を含む。ウェブ２は、ガイドロール４により所定の搬送路に沿って案内され、圧胴１２により版胴１１に圧接される。ウェブ２には版胴１１に対応した色の絵柄および見当マークが印刷される。第１印刷ユニット１０Ａでは第１見当マーク６Ａ（図１では不図示）が印刷され、第２印刷ユニット１０Ｂでは第２見当マーク６Ｂ（図１では不図示）が印刷される。多色刷印刷システム１００が対象とするウェブ２は、透光性を有するウェブであり、例えば透明のウェブである。 FIG. 1 is a diagram showing a configuration of a multicolor printing system 100 according to an embodiment. The multicolor printing system 100 includes a first printing unit 10A, a second printing unit 10B, and a register control unit 20. The first printing unit 10A and the second printing unit 10B include a plate cylinder 11 and an impression cylinder 12, respectively. The web 2 is guided along a predetermined transport path by the guide roll 4, and is pressed against the plate cylinder 11 by the impression cylinder 12. A color pattern and a register mark corresponding to the plate cylinder 11 are printed on the web 2. The first printing unit 10A prints the first register mark 6A (not shown in FIG. 1), and the second printing unit 10B prints the second register mark 6B (not shown in FIG. 1). The web 2 targeted by the multicolor printing system 100 is a translucent web, for example, a transparent web.

見当制御ユニット２０は、第１センサ３０ａと、第２センサ３０ｂと、第１背景部５０ａと、第２背景部５０ｂと、制御部４０と、を備える。これらは、ウェブ２に印刷された見当マークを検出し、その検出結果に基づいて第１印刷ユニット１０Ａと第２印刷ユニット１０Ｂとの間で見当ずれが生じているか否か判定する。見当ずれが生じている場合、版胴１１の回転量を増減させて見当ずれを解消させる。 The register control unit 20 includes a first sensor 30a, a second sensor 30b, a first background unit 50a, a second background unit 50b, and a control unit 40. These detect the register mark printed on the web 2, and determine whether or not there is a misregistration between the first printing unit 10A and the second printing unit 10B based on the detection result. When the misregistration occurs, the amount of rotation of the plate cylinder 11 is increased or decreased to eliminate the misregistration.

図２は、見当制御ユニット２０の機能および構成を示すブロック図である。 FIG. 2 is a block diagram showing the functions and configurations of the register control unit 20.

第１背景部５０ａは、ウェブ２を挟んで第１センサ３０ａと対向するように、より具体的には、ウェブ２を透過した、第１センサ３０ａの光源３２からの光が照射されるように配置される。第１背景部５０ａは、形状は特に限定しないが、本実施の形態では板状の形状を有する。第１背景部５０ａは、交換可能であり、後述するように第１見当マーク６Ａの検出に適した色の背景部が採用される。 The first background portion 50a is irradiated with light from the light source 32 of the first sensor 30a that has passed through the web 2 so as to face the first sensor 30a with the web 2 interposed therebetween. Be placed. The shape of the first background portion 50a is not particularly limited, but in the present embodiment, the first background portion 50a has a plate-like shape. The first background portion 50a is replaceable, and as will be described later, a background portion having a color suitable for detecting the first register mark 6A is adopted.

第２背景部５０ｂは、ウェブ２を挟んで第２センサ３０ｂと対向するように、より具体的には、ウェブ２を透過した、第２センサ３０ｂの光源３２からの光が照射されるように配置される。第２背景部５０ｂは、形状は特に限定しないが、本実施の形態では板状の形状を有する。第２背景部５０ｂは、交換可能であり、後述するように第２見当マーク６Ｂの検出に適した色の背景部が採用される。 The second background portion 50b is irradiated with light from the light source 32 of the second sensor 30b that has passed through the web 2 so as to face the second sensor 30b with the web 2 interposed therebetween. Be placed. The shape of the second background portion 50b is not particularly limited, but in the present embodiment, the second background portion 50b has a plate-like shape. The second background portion 50b is replaceable, and a background portion having a color suitable for detecting the second register mark 6B is adopted as will be described later.

第１センサ３０ａと第２センサ３０ｂは間隔Ｌで配置される。間隔Ｌは、見当ずれが生じていないときにおける第１見当マーク６Ａと第２見当マーク６Ｂとの距離に相当する。第１センサ３０ａおよび第２センサ３０ｂは、光学式のセンサであり、それぞれ光源３２と、光学系３３と、受光素子３４と、を含む。 The first sensor 30a and the second sensor 30b are arranged at an interval L. The interval L corresponds to the distance between the first register mark 6A and the second register mark 6B when there is no misregistration. The first sensor 30a and the second sensor 30b are optical sensors, and include a light source 32, an optical system 33, and a light receiving element 34, respectively.

光源３２は、ウェブ２に向けて光を照射する。光源３２は特に、見当マークが通過する領域に向けて光を照射する。光源３２から照射された光は、見当マークに照射され、そこで反射して光学系３３により集光され、受光素子３４により受光される。あるいは、光源から照射された光は、ウェブ２を透過して背景部に照射され、そこで反射して再びウェブ２を透過し、光学系３３により集光され、受光素子３４により受光される。 The light source 32 irradiates the web 2 with light. The light source 32 specifically irradiates light toward a region through which the register mark passes. The light emitted from the light source 32 is applied to the register mark, reflected there, collected by the optical system 33, and received by the light receiving element 34. Alternatively, the light emitted from the light source passes through the web 2 and irradiates the background portion, is reflected there, passes through the web 2 again, is collected by the optical system 33, and is received by the light receiving element 34.

光学系３３は公知の技術を用いて構成される。 The optical system 33 is configured by using a known technique.

受光素子３４は、例えばフォトダイオードである。受光素子３４は、受光した光を電流信号に変換して出力する。この電流信号の大きさは、受光した光の強度と受光感度との乗算値を波長毎に積算した大きさである。つまり受光素子３４は、受光した光に応じた電流信号を出力する。電流信号は、不図示の電流電圧変換回路によって電圧信号に変換され、制御部４０に出力される。 The light receiving element 34 is, for example, a photodiode. The light receiving element 34 converts the received light into a current signal and outputs it. The magnitude of this current signal is the magnitude obtained by integrating the multiplication value of the intensity of the received light and the light receiving sensitivity for each wavelength. That is, the light receiving element 34 outputs a current signal corresponding to the received light. The current signal is converted into a voltage signal by a current-voltage conversion circuit (not shown) and output to the control unit 40.

制御部４０は、第１見当マーク検出部４４ａと、第２見当マーク検出部４４ｂと、見当誤差制御部４６と、を含む。 The control unit 40 includes a first register mark detection unit 44a, a second register mark detection unit 44b, and a registration error control unit 46.

第１見当マーク検出部４４ａは、第１センサ部３１ａから出力される信号に基づいて、第１見当マーク６Ａを検出する。第１見当マーク検出部４４ａは、第１センサ部３１ａから出力された信号の信号強度と所定の検出閾値とを比較し、例えば信号強度が検出閾値を超えたとき、そのタイミングで第１見当マーク６Ａを検出した（検出領域に第１見当マーク６Ａが到達した）と判断する。第２見当マーク検出部４４ｂは、第２センサ部３１ｂから出力される信号に基づいて、第２見当マーク６Ｂを検出する。第２見当マーク検出部４４ｂは、第１見当マーク検出部４４ａと同様に構成される。 The first register mark detection unit 44a detects the first register mark 6A based on the signal output from the first sensor unit 31a. The first register mark detection unit 44a compares the signal strength of the signal output from the first sensor unit 31a with a predetermined detection threshold value, and when, for example, the signal strength exceeds the detection threshold value, the first register mark is marked at that timing. It is determined that 6A has been detected (the first register mark 6A has reached the detection area). The second register mark detection unit 44b detects the second register mark 6B based on the signal output from the second sensor unit 31b. The second register mark detection unit 44b is configured in the same manner as the first register mark detection unit 44a.

見当誤差制御部４６には、第１見当マーク検出部４４ａおよび第２見当マーク検出部４４ｂのそれぞれから検出結果が入力される。見当誤差制御部４６は、これらの検出結果に基づき各版胴１１間で生じる印刷位置のずれ、すなわち見当ずれの有無を判断する。上述したように、第１センサ部３１ａと第２センサ部３１ｂは間隔Ｌで配置され、見当ずれが生じていないときは第１見当マーク６Ａと第２見当マーク６Ｂも間隔Ｌで印刷されるため、見当ずれが生じていない場合、第１見当マーク６Ａと第２見当マーク６Ｂは実質的に同一のタイミングで検出される。したがって、第１見当マーク検出部４４ａによって第１見当マーク６Ａが検出された第１時刻と、第２見当マーク検出部４４ｂによって第２見当マーク６Ｂが検出された第２時刻とが実質的に同一であるとき、見当誤差制御部４６は、見当ずれが生じていないと判断する。一方、第１時刻と第２時刻とが異なるとき、見当誤差制御部４６は、第１時刻と第２時刻との差分にウェブ２の送り速度を乗じた分だけ走行方向に見当ずれが生じていると判断する。 Detection results are input to the registration error control unit 46 from each of the first registration mark detection unit 44a and the second registration mark detection unit 44b. Based on these detection results, the registration error control unit 46 determines whether or not there is a print position deviation, that is, a registration deviation, which occurs between the plate cylinders 11. As described above, the first sensor unit 31a and the second sensor unit 31b are arranged at an interval L, and when there is no misregistration, the first register mark 6A and the second register mark 6B are also printed at an interval L. When no misregistration occurs, the first register mark 6A and the second register mark 6B are detected at substantially the same timing. Therefore, the first time when the first register mark 6A is detected by the first register mark detection unit 44a and the second time when the second register mark 6B is detected by the second register mark detection unit 44b are substantially the same. When, the registration error control unit 46 determines that no misregistration has occurred. On the other hand, when the first time and the second time are different, the registration error control unit 46 causes a misregistration in the traveling direction by the amount obtained by multiplying the difference between the first time and the second time by the feed speed of the web 2. Judge that there is.

見当ずれが生じている場合、見当誤差制御部４６は、例えば第２印刷ユニット１０Ｂの駆動モータ（不図示）に補正信号を出力する。駆動モータは補正信号に基づき見当ずれが修正されるよう版胴１１を駆動する。これにより、走行方向におけるウェブ２の見当ずれが調整される。 When the misregistration occurs, the registration error control unit 46 outputs a correction signal to, for example, a drive motor (not shown) of the second printing unit 10B. The drive motor drives the plate cylinder 11 so that the misregistration is corrected based on the correction signal. As a result, the misregistration of the web 2 in the traveling direction is adjusted.

以上が、多色刷印刷システム１００の基本的な構成とその動作である。 The above is the basic configuration and operation of the multicolor printing system 100.

続いて、光源３２が照射する光の波長、受光素子３４の感度波長範囲、見当マークの色、および背景部の色の関係について詳細に説明する。感度波長範囲とは、受光感度が所定の第１閾値以上の波長の範囲をいう。第１閾値は、実験による知見から、適宜設定することができる。以下では、第１センサ３０ａの光源３２が照射する光の波長、第１センサ３０ａの受光素子３４の感度波長範囲、第１見当マーク６Ａの色および第１背景部５０ａの色の関係について説明するが、第２センサ３０ｂの光源３２が照射する光の波長、第２センサ３０ｂの受光素子３４の感度波長範囲、第２見当マーク６Ｂの色および第２背景部５０ｂの色についても同様の説明が当てはまる。 Subsequently, the relationship between the wavelength of the light emitted by the light source 32, the sensitivity wavelength range of the light receiving element 34, the color of the register mark, and the color of the background portion will be described in detail. The sensitivity wavelength range means a wavelength range in which the light receiving sensitivity is equal to or higher than a predetermined first threshold value. The first threshold value can be appropriately set based on the knowledge obtained from the experiment. Hereinafter, the relationship between the wavelength of the light emitted by the light source 32 of the first sensor 30a, the sensitivity wavelength range of the light receiving element 34 of the first sensor 30a, the color of the first register mark 6A, and the color of the first background portion 50a will be described. However, the same explanation is given for the wavelength of the light emitted by the light source 32 of the second sensor 30b, the sensitivity wavelength range of the light receiving element 34 of the second sensor 30b, the color of the second register mark 6B, and the color of the second background portion 50b. apply.

ところで、物体に照射された光は、一部の波長成分は反射され、残りの反射成分は吸収される。どの波長成分が反射されてどの波長成分が吸収されるかは、すなわちどの波長成分の反射率が高くてどの波長成分の反射率が低いかは、物体表面の色によって異なる。このような特性は、分光反射率特性とも呼ばれる。 By the way, in the light radiated to the object, some wavelength components are reflected and the remaining reflected components are absorbed. Which wavelength component is reflected and which wavelength component is absorbed, that is, which wavelength component has high reflectance and which wavelength component has low reflectance, depends on the color of the object surface. Such characteristics are also called spectral reflectance characteristics.

例えば、表面が赤色の物体は、赤色の波長成分（長波長成分）の反射率は高く、青色の波長成分（短波長成分）や緑色の波長成分（中波長成分）の反射率は低い。したがって、表面が赤色の物体に赤色の波長成分の強度が高い光を照射すると、照射光のほとんどが反射されるため、反射光の強度は比較的高くなる。一方、表面が赤色の物体に、赤色の波長成分の強度が低い光あるいは赤色の波長成分を含まない光、例えば青色の波長成分や緑色の波長成分のみを含む光を照射すると、照射光のほとんどが吸収されるため、反射光の強度は比較的低くなる。 For example, an object having a red surface has a high reflectance of a red wavelength component (long wavelength component) and a low reflectance of a blue wavelength component (short wavelength component) and a green wavelength component (medium wavelength component). Therefore, when an object having a red surface is irradiated with light having a high intensity of a red wavelength component, most of the irradiation light is reflected, so that the intensity of the reflected light is relatively high. On the other hand, when an object having a red surface is irradiated with light having a low intensity of a red wavelength component or light containing no red wavelength component, for example, light containing only a blue wavelength component or a green wavelength component, most of the irradiation light is emitted. Is absorbed, so the intensity of reflected light is relatively low.

また例えば、表面が青色の物体は、青色の波長成分（短波長成分）の反射率は高く、緑色の波長成分（中波長成分）や赤色の波長成分（長波長成分）の反射率は低い。したがって、表面が青色の物体に青色の波長成分の強度が高い光を照射すると、照射光のほとんどが反射されるため、反射光の強度は比較的高くなる。一方、表面が青色の物体に、青色の波長成分の強度が低い光あるいは青色の波長成分を含まない光、例えば緑色の波長成分や赤色の波長成分のみを含む光を照射すると、照射光のほとんどが吸収されるため、反射光の強度は比較的弱くなる。 Further, for example, an object having a blue surface has a high reflectance of a blue wavelength component (short wavelength component) and a low reflectance of a green wavelength component (medium wavelength component) and a red wavelength component (long wavelength component). Therefore, when an object having a blue surface is irradiated with light having a high intensity of a blue wavelength component, most of the irradiation light is reflected, so that the intensity of the reflected light is relatively high. On the other hand, when an object having a blue surface is irradiated with light having a low intensity of a blue wavelength component or light containing no blue wavelength component, for example, light containing only a green wavelength component or a red wavelength component, most of the irradiation light is emitted. Is absorbed, so the intensity of reflected light is relatively weak.

本実施の形態では、この原理を利用して見当マークを精度良く検出する。 In the present embodiment, the register mark is detected with high accuracy by using this principle.

図３は、第１センサ３０の光源３２が照射する光の波長と、第１センサ３０の受光素子３４の感度波長範囲との関係の一例を示す図である。 FIG. 3 is a diagram showing an example of the relationship between the wavelength of light emitted by the light source 32 of the first sensor 30 and the sensitivity wavelength range of the light receiving element 34 of the first sensor 30.

図３の例では、光源３２は、受光素子３４の感度波長範囲の全ての波長を含む光を照射する。すなわち、光源３２が照射する光の波長域は、受光素子３４の感度波長範囲を包含する。なお、光源３２が照射する光の波長域とは、当該光に含まれる各波長成分のうち、強度が所定の第２閾値以上である波長成分の範囲をいう。第２閾値は、実験による知見から、適宜設定することができる。 In the example of FIG. 3, the light source 32 irradiates light including all wavelengths in the sensitivity wavelength range of the light receiving element 34. That is, the wavelength range of the light emitted by the light source 32 includes the sensitivity wavelength range of the light receiving element 34. The wavelength range of the light emitted by the light source 32 refers to a range of wavelength components whose intensity is equal to or higher than a predetermined second threshold value among the wavelength components contained in the light. The second threshold value can be appropriately set based on the knowledge obtained from the experiment.

この場合、第１見当マーク６Ａの色が、受光素子３４の感度波長範囲内の波長の色であれば、第１背景部５０ａには当該感度波長範囲外の波長の色を採用する。言い換えると、第１見当マーク６Ａの色が、当該感度波長範囲の波長成分の反射率が高い色であれば、第１背景部５０ａには、当該感度波長範囲の波長成分の反射率が低い色を採用する。 In this case, if the color of the first register mark 6A is a color having a wavelength within the sensitivity wavelength range of the light receiving element 34, a color having a wavelength outside the sensitivity wavelength range is adopted for the first background portion 50a. In other words, if the color of the first register mark 6A is a color having a high reflectance of the wavelength component in the sensitivity wavelength range, the first background portion 50a is a color having a low reflectance of the wavelength component in the sensitivity wavelength range. To adopt.

この場合、光源３２からの光が第１見当マーク６Ａに照射されると、当該光に含まれる当該感度波長範囲内の波長成分は第１見当マーク６Ａにおいてあまり吸収されずに反射されるため、第１見当マーク６Ａからの反射光を受光した受光素子３４は比較的高い電流信号を出力する。 In this case, when the light from the light source 32 is applied to the first register mark 6A, the wavelength component within the sensitivity wavelength range included in the light is reflected by the first register mark 6A without being absorbed so much. The light receiving element 34 that receives the reflected light from the first register mark 6A outputs a relatively high current signal.

また、光源３２からの光が、第１見当マーク６Ａに照射されず、ウェブ２を透過して第１背景部５０ａに照射されると、当該光に含まれる当該感度波長範囲内の波長成分は第１背景部５０ａにおいてあまり反射されずに吸収され、これにより第１背景部５０ａからの反射光には当該感度波長範囲内の波長成分は含まれなくなる、あるいは反射光に含まれる当該感度波長範囲内の波長成分は強度が低くなるため、第１背景部５０ａからの反射光を受光した受光素子３４は比較的低い電流信号しか出力しない。 Further, when the light from the light source 32 is not applied to the first register mark 6A but is transmitted to the first background portion 50a through the web 2, the wavelength component within the sensitivity wavelength range included in the light is released. The light reflected from the first background portion 50a is absorbed without being reflected so much in the first background portion 50a, so that the wavelength component within the sensitivity wavelength range is not included in the reflected light, or the sensitivity wavelength range included in the reflected light. Since the wavelength component inside has a low intensity, the light receiving element 34 that receives the reflected light from the first background portion 50a outputs only a relatively low current signal.

したがって、第１見当マーク６Ａからの反射光による電流信号が第１背景部５０ａからの反射光による電流信号よりもひときわ高くなり、第１見当マーク６Ａからの反射光による電流信号が際立つため、精度良く第１見当マーク６Ａを検出できる。 Therefore, the current signal due to the reflected light from the first register mark 6A is remarkably higher than the current signal due to the reflected light from the first background portion 50a, and the current signal due to the reflected light from the first register mark 6A stands out. The first register mark 6A can be detected well.

一方、第１見当マーク６Ａの色が、受光素子３４の感度波長範囲外の波長の色であれば、第１背景部５０ａには感度波長範囲内の波長の色を採用する。言い換えると、第１見当マーク６Ａの色が、当該感度波長範囲の波長成分の反射率が低い色であれば、第１背景部５０ａには当該感度波長範囲の波長成分の反射率が高い色を採用する。 On the other hand, if the color of the first register mark 6A is a color having a wavelength outside the sensitivity wavelength range of the light receiving element 34, a color having a wavelength within the sensitivity wavelength range is adopted for the first background portion 50a. In other words, if the color of the first register mark 6A is a color having a low reflectance of the wavelength component in the sensitivity wavelength range, the first background portion 50a is a color having a high reflectance of the wavelength component in the sensitivity wavelength range. adopt.

この場合、光源３２からの光が第１見当マーク６Ａに照射されると、当該光に含まれる当該感度波長範囲内の波長成分は第１見当マーク６Ａにおいてあまり反射されずに吸収され、これにより第１見当マーク６Ａからの反射光には当該感度波長範囲内の波長成分は含まれなくなる、あるいは反射光に含まれる当該感度波長範囲内の波長成分は強度が低くなるため、第１見当マーク６Ａからの反射光を受光した受光素子３４は比較的低い電流信号しか出力しない。 In this case, when the light from the light source 32 is applied to the first register mark 6A, the wavelength component within the sensitivity wavelength range contained in the light is absorbed by the first register mark 6A without being reflected so much. The reflected light from the first register mark 6A does not include the wavelength component within the sensitivity wavelength range, or the wavelength component within the sensitivity wavelength range contained in the reflected light has a low intensity, so that the first register mark 6A The light receiving element 34 that receives the reflected light from the light receiving element 34 outputs only a relatively low current signal.

また、光源３２からの光がウェブ２を透過して第１背景部５０ａに照射されると、当該光に含まれる当該感度波長範囲内の波長成分は第１背景部５０ａにおいてあまり吸収されずに反射されるため、第１背景部５０ａからの反射光を受光した受光素子３４は比較的高い電流信号を出力する。 Further, when the light from the light source 32 passes through the web 2 and irradiates the first background portion 50a, the wavelength component within the sensitivity wavelength range included in the light is not so absorbed by the first background portion 50a. Since it is reflected, the light receiving element 34 that receives the reflected light from the first background portion 50a outputs a relatively high current signal.

したがって、第１見当マーク６Ａからの反射光による電流信号が第１背景部５０ａからの反射光による電流信号よりもひときわ低くなり、第１見当マーク６Ａからの反射光による電流信号が際立つため、精度良く第１見当マーク６Ａを検出できる。 Therefore, the current signal due to the reflected light from the first register mark 6A is significantly lower than the current signal due to the reflected light from the first background portion 50a, and the current signal due to the reflected light from the first register mark 6A stands out. The first register mark 6A can be detected well.

なお、好ましくは、第１背景部５０ａには、受光素子３４の感度波長範囲内で、かつ、光源３２が照射する光のピーク波長と実質的に一致する波長の色を採用する。この場合、第１見当マーク６Ａからの反射光による電流信号と第１背景部５０ａからの反射光による電流信号との差がより大きくなるため、より精度良く第１見当マーク６Ａを検出できる。 It is preferable that the first background portion 50a adopts a color having a wavelength within the sensitivity wavelength range of the light receiving element 34 and substantially matching the peak wavelength of the light emitted by the light source 32. In this case, the difference between the current signal due to the reflected light from the first register mark 6A and the current signal due to the reflected light from the first background portion 50a becomes larger, so that the first register mark 6A can be detected more accurately.

図４（ａ）、（ｂ）は、第１センサ３０の光源３２が照射する光の波長と、第１センサ３０の受光素子３４の感度波長範囲との関係の別の例を示す図である。 4 (a) and 4 (b) are diagrams showing another example of the relationship between the wavelength of the light emitted by the light source 32 of the first sensor 30 and the sensitivity wavelength range of the light receiving element 34 of the first sensor 30. ..

図４（ａ）、（ｂ）の例では、光源３２は、受光素子３４の感度波長範囲の一部の波長を含む光を照射する。受光素子３４の感度波長範囲が比較的広い場合、例えば受光素子３４がＲＧＢフォトダイオードの場合、このような関係になりやすい。 In the examples of FIGS. 4A and 4B, the light source 32 irradiates light including a part of the sensitivity wavelength range of the light receiving element 34. When the sensitivity wavelength range of the light receiving element 34 is relatively wide, for example, when the light receiving element 34 is an RGB photodiode, such a relationship is likely to occur.

この場合、第１見当マーク６Ａの色が、受光素子３４の感度波長範囲内、かつ、光源３２が照射する光の波長域内の波長の色、すなわち波長範囲Ｒ１内の波長の色であれば、第１背景部５０ａには、受光素子３４の感度波長範囲外の波長および／または光源３２が照射する光の波長域外の波長の色、すなわち波長範囲Ｒ２内の波長の色を採用する。言い換えると、第１見当マーク６Ａの色が、当該感度波長範囲の波長成分の反射率が高く、かつ、光源３２が照射する光の波長域内の波長の色であれば、第１背景部５０ａには、当該感度波長範囲の波長成分の反射率が低い色および／または光源３２が照射する光の波長域外の波長の色を採用する。 In this case, the color of the first register mark. 6A, in the sensitivity wavelength range of the light receiving element 34, and the color of the wavelength of the wavelength range of the light source 32 is irradiated, that is, if the color of a wavelength in the wavelength range R 1 , the first background portion 50a, the color of the wavelength of the wavelength outside of the light sensitive wavelength range of the wavelength and / or the light source 32 of the light receiving element 34 is irradiated, i.e. to employ a color of a wavelength in the wavelength range R 2. In other words, if the color of the first register mark 6A has a high reflectance of the wavelength component in the sensitivity wavelength range and the wavelength is within the wavelength range of the light emitted by the light source 32, the first background portion 50a Adopts a color having a low reflectance of a wavelength component in the sensitivity wavelength range and / or a color having a wavelength outside the wavelength range of the light emitted by the light source 32.

この場合、光源３２からの光が第１見当マーク６Ａに照射されると、当該光に含まれる当該感度波長範囲内の波長成分は第１見当マーク６Ａにおいてあまり吸収されずに反射されるため、第１見当マーク６Ａからの反射光を受光した受光素子３４は比較的高い電流信号を出力する。 In this case, when the light from the light source 32 is applied to the first register mark 6A, the wavelength component within the sensitivity wavelength range included in the light is reflected by the first register mark 6A without being absorbed so much. The light receiving element 34 that receives the reflected light from the first register mark 6A outputs a relatively high current signal.

また、光源３２からの光がウェブ２を透過して第１背景部５０ａに照射されると、当該光に含まれる当該感度波長範囲内の波長成分は第１背景部５０ａにおいてあまり反射されずに吸収され、これにより第１背景部５０ａからの反射光には当該感度波長範囲内の波長成分は含まれなくなる、あるいは反射光に含まれる当該感度波長範囲内の波長成分は強度が低くなるため、第１背景部５０ａからの反射光を受光した受光素子３４は比較的低い電流信号しか出力しない。 Further, when the light from the light source 32 passes through the web 2 and irradiates the first background portion 50a, the wavelength component within the sensitivity wavelength range included in the light is not reflected so much by the first background portion 50a. As a result, the reflected light from the first background portion 50a does not contain the wavelength component within the sensitivity wavelength range, or the wavelength component within the sensitivity wavelength range contained in the reflected light has a low intensity. The light receiving element 34 that receives the reflected light from the first background portion 50a outputs only a relatively low current signal.

したがって、第１見当マーク６Ａからの反射光による電流信号が第１背景部５０ａからの反射光による電流信号よりもひときわ高くなり、第１見当マーク６Ａからの反射光による電流信号が際立つため、精度良く第１見当マーク６Ａを検出できる。 Therefore, the current signal due to the reflected light from the first register mark 6A is remarkably higher than the current signal due to the reflected light from the first background portion 50a, and the current signal due to the reflected light from the first register mark 6A stands out. The first register mark 6A can be detected well.

一方、第１見当マーク６Ａの色が、受光素子３４の感度波長範囲外の波長および／または光源３２が照射する光の波長域外の波長の色、すなわち波長範囲Ｒ２内の波長の色であれば、第１背景部５０ａには、当該感度波長範囲内、かつ、光源３２が照射する光の波長域内の波長の色、すなわち波長範囲Ｒ１内の波長の色を採用する。言い換えると、第１見当マーク６Ａの色が、当該感度波長範囲の波長成分の光の反射率が低い色および／または光源３２が照射する光の波長域外の波長の色であれば、第１背景部５０ａには、当該感度波長範囲内の波長成分の反射率が高く、かつ、光源３２が照射する光の波長域内の波長の色を採用する。 On the other hand, the color of the first register mark. 6A, the color of the wavelength of the wavelength outside of the light sensitive wavelength range of the wavelength and / or the light source 32 of the light receiving element 34 is irradiated, that is, the color of a wavelength in the wavelength range R 2 there if, in the first background portion 50a, within the sensitivity wavelength range and the light source 32 is color wavelength of wavelength range of light to be irradiated, i.e. to employ a color of a wavelength in the wavelength range R 1. In other words, if the color of the first register mark 6A is a color having a low light reflectance of a wavelength component in the sensitivity wavelength range and / or a color having a wavelength outside the wavelength range of the light emitted by the light source 32, the first background For the unit 50a, a color having a high reflectance of a wavelength component within the sensitivity wavelength range and a wavelength within the wavelength range of the light emitted by the light source 32 is adopted.

この場合、光源３２からの光が第１見当マーク６Ａに照射されると、当該光に含まれる当該感度波長範囲内の波長成分は第１見当マーク６Ａにおいてあまり反射されずに吸収され、これにより第１見当マーク６Ａからの反射光には当該感度波長範囲内の波長成分は含まれなくなる、あるいは反射光に含まれる当該感度波長範囲内の波長成分は強度が低くなるため、第１見当マーク６Ａからの反射光を受光した受光素子３４は比較的低い電流信号しか出力しない。 In this case, when the light from the light source 32 is applied to the first register mark 6A, the wavelength component within the sensitivity wavelength range contained in the light is absorbed by the first register mark 6A without being reflected so much. The reflected light from the first register mark 6A does not include the wavelength component within the sensitivity wavelength range, or the wavelength component within the sensitivity wavelength range contained in the reflected light has a low intensity, so that the first register mark 6A The light receiving element 34 that receives the reflected light from the light receiving element 34 outputs only a relatively low current signal.

また、この場合、光源３２からの光がウェブ２を透過して第１背景部５０ａに照射されると、当該光に含まれる当該感度波長範囲内の波長成分は第１背景部５０ａにおいてあまり吸収されずに反射されるため、第１背景部５０ａからの反射光を受光した受光素子３４は比較的高い電流信号を出力する。 Further, in this case, when the light from the light source 32 passes through the web 2 and is irradiated to the first background portion 50a, the wavelength component within the sensitivity wavelength range included in the light is absorbed so much by the first background portion 50a. Since the light is reflected without being reflected, the light receiving element 34 that receives the reflected light from the first background portion 50a outputs a relatively high current signal.

したがって、第１見当マーク６Ａからの反射光による電流信号が第１背景部５０ａからの反射光による電流信号よりもひときわ低くなり、第１見当マーク６Ａからの反射光による電流信号が際立つため、精度良く第１見当マーク６Ａを検出できる。 Therefore, the current signal due to the reflected light from the first register mark 6A is significantly lower than the current signal due to the reflected light from the first background portion 50a, and the current signal due to the reflected light from the first register mark 6A stands out. The first register mark 6A can be detected well.

なお、好ましくは、第１背景部５０ａには、受光素子３４の感度波長範囲内で、かつ、光源３２が照射する光のピーク波長と実質的に一致する波長の色を採用する。この場合、第１見当マーク６Ａからの反射光による電流信号と第１背景部５０ａからの反射光による電流信号との差がより大きくなるため、より精度良く第１見当マーク６Ａを検出できる。 It is preferable that the first background portion 50a adopts a color having a wavelength within the sensitivity wavelength range of the light receiving element 34 and substantially matching the peak wavelength of the light emitted by the light source 32. In this case, since the difference between the current signal due to the reflected light from the first register mark 6A and the current signal due to the reflected light from the first background portion 50a becomes larger, the first register mark 6A can be detected more accurately.

以上、実施の形態に係る多色刷印刷システムの構成と動作ついて説明した。これらの実施の形態は例示であり、それらの各構成要素の組み合わせにいろいろな変形例が可能なこと、またそうした変形例も本発明の範囲にあることは当業者に理解されるところである。 The configuration and operation of the multicolor printing system according to the embodiment have been described above. It will be appreciated by those skilled in the art that these embodiments are exemplary and that various modifications are possible in the combination of their respective components, and that such modifications are also within the scope of the present invention.

実施の形態では、多色刷印刷システム１００が第１印刷ユニット１０Ａと第２印刷ユニット１０Ｂの２つの印刷ユニットを備える場合について説明したが、これには限定されず、多色刷印刷システム１００は、ｎ（≧３）個の印刷ユニットを備えていてもよい。この場合、見当制御ユニット２０は、第１センサ３０ａおよび第２センサ３０ｂを（ｎ−１）セット備えてもよい。 In the embodiment, the case where the multicolor printing system 100 includes two printing units, the first printing unit 10A and the second printing unit 10B, has been described, but the present invention is not limited to this, and the multicolor printing printing system 100 includes n (≧ ≧). 3) It may be provided with three printing units. In this case, the register control unit 20 may include a (n-1) set of a first sensor 30a and a second sensor 30b.

以上、実施の形態に係る多色刷印刷システムの構成と動作について説明した。これらの実施の形態は例示であり、それらの各構成要素の組み合わせにいろいろな変形例が可能なこと、またそうした変形例も本発明の範囲にあることは当業者に理解されるところである。 The configuration and operation of the multicolor printing system according to the embodiment have been described above. It will be appreciated by those skilled in the art that these embodiments are exemplary and that various modifications are possible in the combination of their respective components, and that such modifications are also within the scope of the present invention.

２０ 見当制御ユニット、 ３２ 光源、 ３４ 受光素子、 ５０ａ 第１背景部、 ５０ｂ 第２背景部、 １００ 多色刷印刷システム。 20 Register control unit, 32 light source, 34 light receiving element, 50a first background part, 50b second background part, 100 multicolor printing system.

Claims (4)

透光性を有するウェブに印刷された見当マークを検出するための見当制御ユニットであって、
前記ウェブに向けて光を照射する光源と、
前記ウェブを透過した前記光源からの光が照射される背景部と、
前記見当マークおよび前記背景部で反射された前記光源からの光を受光する受光素子と、を備え、
前記光源は、前記受光素子の感度波長範囲内の波長を有する光をウェブに照射し、
前記見当マークおよび前記背景部の一方は、前記感度波長範囲内の波長の色であり、他方は前記感度波長範囲外の波長の色であることを特徴とする見当制御ユニット。 A register control unit for detecting a register mark printed on a translucent web.
A light source that irradiates the web with light,
A background portion that is irradiated with light from the light source that has passed through the web and
A light receiving element that receives light from the light source reflected by the register mark and the background portion is provided.
The light source irradiates the web with light having a wavelength within the sensitivity wavelength range of the light receiving element.
A register control unit characterized in that one of the register mark and the background portion is a color having a wavelength within the sensitivity wavelength range, and the other is a color having a wavelength outside the sensitivity wavelength range. 透光性を有するウェブに印刷された見当マークを検出するための見当制御ユニットであって、
前記ウェブに向けて光を照射する光源と、
前記ウェブを透過した前記光源からの光が照射される背景部と、
前記見当マークおよび前記背景部で反射された前記光源からの光を受光する受光素子と、を備え、
前記光源は、前記受光素子の感度波長範囲内の波長を有する光をウェブに照射し、
前記見当マークおよび前記背景部の一方は、前記光源が照射する光の波長域内の色であり、他方は波長域外の色であることを特徴とする見当制御ユニット。 A register control unit for detecting a register mark printed on a translucent web.
A light source that irradiates the web with light,
A background portion that is irradiated with light from the light source that has passed through the web and
A light receiving element that receives light from the light source reflected by the register mark and the background portion is provided.
The light source irradiates the web with light having a wavelength within the sensitivity wavelength range of the light receiving element.
A register control unit characterized in that one of the register mark and the background portion is a color within the wavelength range of the light emitted by the light source, and the other is a color outside the wavelength range. 前記背景部の色は、前記光源が照射する光のピーク波長の色と実質的に一致することを特徴とする請求項１または２に記載の見当制御ユニット。 The register control unit according to claim 1 or 2, wherein the color of the background portion substantially matches the color of the peak wavelength of the light emitted by the light source. 請求項１から３のいずれかに記載の見当制御ユニットを備えることを特徴とする多色刷印刷システム。 A multicolor printing system comprising the register control unit according to any one of claims 1 to 3.
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