JP2001018364A - Design color tone monitoring apparatus and print color tone controller - Google Patents
Design color tone monitoring apparatus and print color tone controllerInfo
- Publication number
- JP2001018364A JP2001018364A JP11197411A JP19741199A JP2001018364A JP 2001018364 A JP2001018364 A JP 2001018364A JP 11197411 A JP11197411 A JP 11197411A JP 19741199 A JP19741199 A JP 19741199A JP 2001018364 A JP2001018364 A JP 2001018364A
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- Japan
- Prior art keywords
- color tone
- color
- spectral
- printing
- calculated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Spectrometry And Color Measurement (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は同一の絵柄が繰り返
し印刷される印刷物の色調を安定化する為の、絵柄色調
監視装置と印刷色調制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a picture color tone monitoring device and a printing color tone control device for stabilizing the color tone of a printed material on which the same picture is repeatedly printed.
【０００２】[0002]
【従来の技術】各色のインキを用紙に重ね合わせて塗布
して絵柄を連続的に再現する印刷工程においては、印刷
機の幅方向（印刷物が流れる方向とは直交する方向）に
配置された多数のインキキーと呼ばれるインキ量を調節
する機構を備えており、所望の色調再現を得ており、原
則的にはインキキーの状態が一定で維持されていれば、
色調は安定するはずであるが、印刷機の状態の変化や、
温度、湿度等の環境の変化等により、印刷物の色調が徐
々に変化する。そのため、印刷開始時に校正刷りと本刷
りとの色調を合わせる、あるいは印刷中に状態変化、温
度変化、湿度変化等による印刷機の特性の変化、材料物
性（主にインキ）の変化による色調の変化を修正する必
要がある。2. Description of the Related Art In a printing process in which ink of each color is applied to paper in a superimposed manner and a pattern is continuously reproduced, a large number of inks are arranged in a width direction of a printing machine (a direction orthogonal to a direction in which a printed material flows). It has a mechanism to adjust the amount of ink called the ink key of, and the desired color tone reproduction is obtained, and in principle, if the state of the ink key is maintained constant,
The color tone should be stable, but changes in the state of the printing press,
The color tone of the printed matter gradually changes due to environmental changes such as temperature and humidity. Therefore, the color tone of the proof print and the final print is matched at the start of printing, or the color tone changes due to changes in printing machine characteristics due to state changes, temperature changes, humidity changes, etc. during printing, and changes in material properties (mainly ink). Need to be corrected.
【０００３】従来は、出来上がった印刷物の色調を印刷
作業者が目視により常に監視し、刷出し時に定めた基準
印刷物の色調からのずれを検出している。色調の変化を
検出した場合は、インキキーの開度を調整することによ
り色調を調整している。Conventionally, the color tone of a completed printed matter is constantly monitored visually by a printing operator, and a deviation from the color tone of a reference printed matter determined at the time of printing is detected. When a change in color tone is detected, the color tone is adjusted by adjusting the opening of the ink key.
【０００４】このように、従来では、測定対象の印刷物
を見て、基準印刷物との色調の違いを判断するのは、熟
練した作業者の勘に頼っていた。そのため、作業者の主
観が強く影響するし、作業者間の判断のバラツキもあ
り、客観的な品質（印刷物の色調）の保証ができないと
ともに、熟練作業者の確保、熟練度の維持、向上に多大
の経費と時間がかかる欠点があった。[0004] As described above, in the related art, judgment of a difference in color tone from the reference printed matter by looking at the printed matter to be measured relied on the intuition of a skilled worker. For this reason, the subjectivity of the workers has a strong influence, and there is variation in judgment among the workers. As a result, it is not possible to guarantee objective quality (color tone of printed matter), and to secure skilled workers, maintain and improve the skill level. The disadvantage is that it requires a great deal of money and time.
【０００５】さらに、印刷機では高速で印刷物が走行し
ているので、走行中の印刷物を見て色調を確認すること
は困難であり、通常は、複数枚毎に印刷物を適宜抜き取
り、色調の変化を監視している。そのため、作業者が色
調の不良を検出してから調整が完了するまでの間に大量
の不良印刷物が生じてしまう欠点がある。[0005] Further, since the printed matter is running at a high speed in the printing press, it is difficult to check the color tone by looking at the printed matter while the printing machine is running. Is monitoring. For this reason, there is a disadvantage that a large amount of defective printed matter occurs between the time when the operator detects the color tone defect and the time when the adjustment is completed.
【０００６】このような作業者の目視監視ではなく、セ
ンサを用いて色調変化を客観的に検出することが考えら
れる。すなわち、印刷物の絵柄の余白部に色調検査用の
カラーパッチを印刷しておいて、濃度計や分光測色計等
のセンサを用いて走行中の印刷物のカラーパッチを測定
し、オンラインで色調の変動を測定・制御することが考
えられている。Instead of visually monitoring the worker, it is conceivable to objectively detect a change in color tone using a sensor. That is, color patches for color tone inspection are printed in the margins of the picture pattern of the printed matter, and the color patches of the running printed matter are measured using a sensor such as a densitometer or a spectrophotometer, and the color tone is measured online. It is considered to measure and control the fluctuation.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、カラー
パッチを印刷する為には、カラーパッチを入れる余白が
必要であり余白部が無駄であり、しかもカラーパッチは
単色、もしくは特定の重ね刷り色であるので、パッチ色
以外のハーフトーン部分（多色重ね刷り）を測定できな
いので、完璧には色の保証ができない欠点がある。However, in order to print a color patch, a margin for inserting the color patch is required, and the margin is wasted, and the color patch is a single color or a specific overprint color. Therefore, since a halftone portion (multicolor overprint) other than the patch color cannot be measured, there is a disadvantage that the color cannot be completely guaranteed.
【０００８】さらに、近年の印刷機においては、速度上
昇と共に印刷余白部分の減少化が進んでおり、多くの品
目においては測定用のカラーパッチを入れられない状況
である。Furthermore, in recent printing presses, the printing margin has been reduced along with the increase in speed, and in many cases, color patches for measurement cannot be put in many items.
【０００９】さらに、前記システムにおける濃度計およ
び測色計は測定対象のカラーパッチの測定に特化された
ものであり、カラーパッチが存在できない状況下におい
てはその意味を成さないといった欠点がある。Further, the densitometer and the colorimeter in the above system are specialized for measuring a color patch to be measured, and have a drawback that they do not make sense when a color patch cannot be present. .
【００１０】この発明は、前記従来の技術の問題点に鑑
みなされたものであり、カラーパッチの印刷が不要で印
刷物の無駄を無くす事が出来ると共に、印刷物の絵柄色
調変動を印刷直後に常時連続して直接監視・保証する事
が出来、監視情報から迅速に色調変動を調整できる印刷
色調制御装置を提供することである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is not necessary to print color patches, so that waste of printed matter can be eliminated. It is an object of the present invention to provide a printing color tone control device capable of directly monitoring and guaranteeing, and adjusting color tone fluctuation quickly from monitoring information.
【００１１】[0011]
【課題を解決するための手段】前記課題を解決するため
に本発明は次に示す手段を提供する。請求項１に示す発
明は、印刷機の印刷物搬送経路の近辺に取付けられ、搬
送中の印刷物の所望の絵柄領域の色調を監視する装置で
あって、 （イ）所望の印刷単位周期毎に、印刷方向に対して測定
アパーチャー領域を複数オーバーラップしながら印刷全
面を複数分割測定が可能な測定手段； （ロ）該所望絵柄領域に対応する分割区間内で測定され
た分光反射強度を積算平均化し、該所望絵柄領域の分光
反射強度とし、該所望絵柄領域に対応する分光反射率を
算出する分光反射率算出手段； （ハ）算出された分光反射率から色座標変換によって色
度を算出すると共に、所望波長領域での分光濃度を算出
する分光濃度算出手段； （ニ）良好な色調と判断された色度と分光濃度を基準値
として記憶する基準値記憶手段； （ホ）時々刻々と測定算出された測定値と該基準値とか
ら、色差ならびに濃度差分を算出し、色差による許容範
囲設定により、色調変動による良品か要修正品かを判断
する色調判断処理手段；以上の（イ）〜（ホ）を全て具
備したことを特徴とする絵柄色調監視装置である。In order to solve the above-mentioned problems, the present invention provides the following means. The invention according to claim 1 is an apparatus which is attached to a vicinity of a printed matter transport path of a printing press and monitors a color tone of a desired picture area of a printed matter being transported, (a) for each desired printing unit cycle, Measuring means capable of dividing the entire printing area into a plurality of sections while overlapping a plurality of measurement aperture areas in the printing direction; (b) integrating and averaging the spectral reflection intensities measured in the divided sections corresponding to the desired picture area; A spectral reflectance calculating means for calculating a spectral reflectance corresponding to the desired picture area as a spectral reflection intensity of the desired picture area; (c) calculating a chromaticity from the calculated spectral reflectance by color coordinate conversion; A spectral density calculating means for calculating a spectral density in a desired wavelength region; (d) a reference value storing means for storing a chromaticity and a spectral density determined as a good color tone as a reference value; A color difference and a density difference from the measured value and the reference value, and a color tone judgment processing means for judging a non-defective product or a product requiring correction by a color tone variation by setting an allowable range based on the color difference; (E) a picture color tone monitoring device characterized by having all of the above.
【００１２】請求項２に示す発明は、印刷機の印刷物搬
送経路中に取付けられ、搬送中の印刷物の所望絵柄領域
の色調変動による印刷物の良品か要修正品かの判断結果
の情報に基づき、 （ヘ）色調が修正を要すると判断した場合に、該濃度差
分値より色調変動を修正すべく、インキ供給量を補正す
る制御量を算出する手段と； （ト）算出した制御補正量をインキ供給量制御装置に送
出する手段を具備したインキ供給量処理；以上の（ヘ）
〜（ト）を全て具備したことを特徴する印刷色調制御装
置である。According to a second aspect of the present invention, there is provided a printer mounted in a printed matter transporting path of a printing machine, based on information of a result of determining whether a printed matter is good or needs to be corrected due to color tone fluctuation of a desired picture area of the printed matter being transported. (F) means for calculating a control amount for correcting the ink supply amount so as to correct the color tone fluctuation from the density difference value when it is determined that the color tone needs to be corrected; Ink supply amount processing provided with means for sending to the supply amount control device;
A printing color tone control device characterized by having all of (1) to (6).
【００１３】請求項３に示す発明は、前記色調変動によ
る印刷物の良品か要修正品かの情報として、請求項１の
絵柄色調監視装置で判断した結果を採用することを特徴
とする請求項２に示した印刷色調制御装置である。According to a third aspect of the present invention, a result determined by the picture color tone monitoring device according to the first aspect is employed as the information on whether the printed matter due to the color tone variation is a good product or a product requiring correction. The printing color tone control device shown in FIG.
【００１４】[0014]
【発明の実施の形態】以下、図面を参照して本発明によ
る印刷色調制御装置の第１の実施形態を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a printing color tone control device according to the present invention will be described below with reference to the drawings.
【００１５】図１は、この発明の一実施の形態に従った
印刷物色調変化測定装置が組み込まれたオフセット輪転
印刷機を概略的に示す側面図であり、給紙部１０ａに配
置されたロール紙がインフィード部１０ｂと冷却部１０
ｅと折り機１０ｆを介して一定のテンション（張力）を
与えられ、Ｋ（黒）、Ｃ（藍）、Ｍ（マゼンタ）、Ｙ
（黄）の４色の印刷ユニット１０ｃを順次通過してい
き、カラー印刷が行われる。印刷ユニットの色の順番や
数はあくまでも一例であり、必ずしもこれ限定されるべ
きものではない。各印刷ユニットは同じ構成であるの
で、印刷ユニット１０ｃのＢｋ上胴のみ詳細を示す。FIG. 1 is a side view schematically showing an offset rotary printing press incorporating a printed matter color tone change measuring device according to an embodiment of the present invention. Is the infeed section 10b and the cooling section 10
e and a certain tension through the folding machine 10f, and K (black), C (indigo), M (magenta), Y
Color printing is performed by sequentially passing through the printing units 10c of four colors (yellow). The order and number of colors of the printing units are merely examples, and are not necessarily limited thereto. Since each printing unit has the same configuration, only the Bk upper cylinder of the printing unit 10c is shown in detail.
【００１６】各印刷ユニットは印刷用紙を上下から挟む
ブランケット胴１１と接触している版胴１２と、インキ
壷１５からのインキを版胴１２に伝えるとともに水舟１
７から版胴１２に湿し水を伝える多数のインキローラ１
６とからなる。図示していないが、インキ壷１５にはイ
ンキキーと呼ばれるインキ量調整具が設けられ、このキ
ーの開度を調整することにより版胴１４に与えられるイ
ンキ量が調整される。また、図示してはいないが、イン
キ壷からインキローラ群１６にインキを供給しているイ
ンキ元ローラによってもインキ量は調整できる。インキ
キーはローラの軸方向に沿って多数設けられており、絵
柄を印刷物の走行方向に沿った線で分割した細長いイン
キキーゾーン毎にインキ量が調整可能となっている。Each printing unit transmits the ink from the ink fountain 15 to the plate cylinder 12 and the plate cylinder 12 in contact with a blanket cylinder 11 sandwiching the printing paper from above and below.
Numerous ink rollers 1 for transmitting dampening water from plate 7 to plate cylinder 12
6 Although not shown, the ink fountain 15 is provided with an ink amount adjuster called an ink key, and the amount of ink applied to the plate cylinder 14 is adjusted by adjusting the opening of the key. Although not shown, the amount of ink can also be adjusted by an ink source roller that supplies ink to the ink roller group 16 from an ink fountain. A large number of ink keys are provided along the axial direction of the roller, and the amount of ink can be adjusted in each of the elongated ink key zones obtained by dividing a picture by a line along the running direction of a printed material.
【００１７】印刷ユニット１０ｃの最終ユニットから出
た印刷物は乾燥部１０ｄ、冷却部１０ｅ、折り機１０ｆ
へと導かれ、最終印刷物とされる。この冷却部１０ｅか
ら折り機１０ｆへと導く複数の搬送ローラー１８上に分
光測定部２２が設けられる。分光測定部２２は非接触で
印刷面の分光反射率を測定する。ただし、分光測色計２
２と印刷物の表面との間隔が大きいと、外乱光の影響を
受けるので、正確な分光波形が得られないため、遮光等
の配慮を行うことが望ましい。The printed matter output from the final unit of the printing unit 10c is a drying unit 10d, a cooling unit 10e, and a folder 10f.
To the final printed matter. The spectrometer 22 is provided on the plurality of transport rollers 18 that guide the cooling unit 10e to the folding machine 10f. The spectral measurement unit 22 measures the spectral reflectance of the print surface in a non-contact manner. However, spectrophotometer 2
If the distance between the printing paper 2 and the surface of the printed matter is large, the light is affected by disturbance light, so that an accurate spectral waveform cannot be obtained.
【００１８】絵柄は周期的に連続して印刷されるので、
測定を絵柄領域と同期させるために、印刷物の走行状態
を把握するロータリエンコーダ２４がいずれかの印刷ユ
ニット内の版胴、もしくは折り機３０の胴、もしくはウ
ェブパスローラに取り付けられる。印刷の単位周期はそ
の印刷機の版胴周囲長によって規定されるが、本実施例
では、図１に示すように、折り機１０ｆ内の単位周期長
に１回転が相当する軸にロータリエンコーダ２４ｂと分
光測定処理部２２が計測する搬送ローラ１８にロータリ
エンコーダ２４ａを接続した。Since the picture is printed continuously and periodically,
In order to synchronize the measurement with the picture area, a rotary encoder 24 for ascertaining the running state of the printed matter is attached to a plate cylinder in any of the printing units, a cylinder of the folding machine 30, or a web path roller. The unit cycle of printing is defined by the perimeter of the plate cylinder of the printing press. In the present embodiment, as shown in FIG. 1, the rotary encoder 24b has an axis corresponding to one rotation of the unit cycle length in the folding machine 10f. The rotary encoder 24a was connected to the transport roller 18 measured by the spectrometry processing unit 22.
【００１９】以下、図２を用いて測定方法について説明
する。ロータリエンコーダ２４は絵柄単位長に同期して
Ｚ相パルス信号を発生する。また、絵柄の走行状態に同
期してＡ／Ｂ相パルス信号を発生する。ロータリエンコ
ーダ２４ｂのＺ相パルス信号は必ずしも絵柄単位長のス
タート時に出力されるとは限らないので、この出力パル
ス信号は分光測定処理部２２の測定開始準備信号とし
た。Hereinafter, the measuring method will be described with reference to FIG. The rotary encoder 24 generates a Z-phase pulse signal in synchronization with the picture unit length. Also, an A / B phase pulse signal is generated in synchronization with the running state of the picture. Since the Z-phase pulse signal of the rotary encoder 24b is not always output at the start of the picture unit length, this output pulse signal is used as a measurement start preparation signal of the spectroscopic measurement processing unit 22.
【００２０】ロータリエンコーダ２４ｂのＺ相パルス信
号を受けた分光測定処理部２２はこれを測定開始準備信
号とし、ロータリエンコーダ２４ａのＡ／Ｂ相パルス信
号をカウントし、絵柄単位長のスタート時と同期して測
定が開始される様に所定のディレイカウントがなされた
後、測定がスタートされる。測定スタートされてから
は、1 領域の測定を十分に満足すべき時定数に相当する
カウントがなされ連続的に測定がなされて行く。所定の
測定数が満足された時点で測定が終了される。Upon receiving the Z-phase pulse signal of the rotary encoder 24b, the spectrometry processing unit 22 uses this as a measurement start preparation signal, counts the A / B-phase pulse signal of the rotary encoder 24a, and synchronizes with the start of the picture unit length. After a predetermined delay count is performed so that the measurement is started, the measurement is started. After the measurement is started, a count corresponding to a time constant that should sufficiently satisfy the measurement of one area is made, and the measurement is continuously performed. The measurement is terminated when a predetermined number of measurements is satisfied.
【００２１】上述したように、印刷物の色調の調整はロ
ーラの軸方向（印刷物の流れる方向と直交する方向）に
配列されたインキキーの開度を変えることにより行われ
るので、分光測定処理部２２はインキキーゾーン毎の分
光反射率を測定する必要がある。そのため、分光測定処
理部２２は各インキキーに対応する位置に多数取り付け
られるか、あるいは軸方向に移動可能な構成とし、１台
の測色計２２で各インキキーに対応する位置を順次測定
できるようにする。As described above, the color tone of the printed matter is adjusted by changing the opening degree of the ink keys arranged in the axial direction of the roller (the direction orthogonal to the flowing direction of the printed matter). It is necessary to measure the spectral reflectance for each ink key zone. For this reason, a large number of spectral measurement processing units 22 are attached to the positions corresponding to the respective ink keys, or are configured to be movable in the axial direction so that one colorimeter 22 can sequentially measure the positions corresponding to the respective ink keys. I do.
【００２２】本実施例では、単位周期長が６２０ｍｍ，
印刷速度が1200rpm ，測定時定数が１００μｓｅｃ．，
３２００パルスのエンコーダーを１００φの測定ローラ
ーに接続し、２てい倍でパルス信号を処理した場合に、
単位周期長内で、約４８６個のサンプリングを行った。
測定時定数的には約１．２４ｍｍずつずれながら連続測
定を行っている。In this embodiment, the unit period length is 620 mm,
The printing speed is 1200 rpm, the measurement time constant is 100 μsec. ,
When the encoder of 3200 pulses is connected to the measuring roller of 100φ and the pulse signal is processed by 2 times,
Approximately 486 samples were taken within a unit cycle length.
Continuous measurement is performed while shifting by about 1.24 mm in terms of measurement time constant.
【００２３】また、測定アパーチャーサイズに３５×７
ｍｍを用いている為、単一アパーチャーサイズで考えた
場合、約５回ほどオーバーラップしながら測定している
事になる。オーバーラップさせる理由としては、測定対
象となる印刷物は連続的につながっているとはいえ、絶
えず走行方向ならびに横方向に揺らいでいる。本装置は
絵柄を直接測色している為、この揺らぎが測定誤差とな
るが、オーバーラップ回数を出来るだけ多くする事によ
り、つまり、所望領域区間の積算平均数が多くなるほど
この揺らぎによる誤差を平滑化する効果が高くなる。
（図３参照)The measurement aperture size is 35 × 7.
Because of the use of mm, when considering a single aperture size, the measurement is performed while overlapping about 5 times. The reason for the overlap is that the printed matter to be measured is continuously connected, but constantly fluctuates in the running direction and the lateral direction. Since this device directly measures the color of the pattern, this fluctuation causes a measurement error.However, by increasing the number of overlaps as much as possible, that is, the error due to this fluctuation increases as the integrated average number of the desired area section increases. The effect of smoothing increases.
(See Fig. 3)
【００２４】上述のような測定方法により、分光測定処
理部２２は、波長が４００〜７００ｎｍの可視光線領域
を波長２０ｍｍ毎の１６チャンネルで、波長が１０００
ｎｍ〜１４００ｎｍの赤外領域を１チャンネルで測定す
る。赤外領域も測定するのは、黒版の有無を調べるため
である。According to the above-described measuring method, the spectroscopic measurement processing section 22 converts the visible light region having a wavelength of 400 to 700 nm into 16 channels every 20 mm and a wavelength of 1000 nm.
The infrared region of nm to 1400 nm is measured by one channel. The reason why the infrared region is also measured is to examine the presence or absence of a black plate.
【００２５】図４に示すように、黒版が存在せず、ＹＭ
Ｃの重ね合わせで黒を印刷する場合は、（ｂ）に示すよ
うに１０００〜１４００ｎｍに吸収が表われないが、黒
版が存在する場合は、（ａ）に示すように１０００〜１
４００ｎｍに吸収が表われる。As shown in FIG. 4, no black plate exists and YM
When printing black by superposition of C, absorption does not appear at 1000 to 1400 nm as shown in (b), but when there is a black plate, 1000 to 1400 as shown in (a).
Absorption appears at 400 nm.
【００２６】測定された全測定個数のなかで、所望絵柄
領域に対応する測定結果は、各ＣＨ毎に積算平均がなさ
れ、所望領域に対する分光反射強度として算出される。
算出された分光反射強度I （λ）は、次式により分光反
射率が算出される。 Ｒ（λ）＝Ｒｗ（λ）×Ｉ（λ）／Ｉｗ（λ） 〔式１〕 ここで、 Ｒ（λ） :分光反射率 Ｒｗ（λ）：正確に目盛つけされた装置で測定された基
準白色板の反射率 Ｉｗ（λ）：本装置で測定された基準白色板の反射強度 である。Of the total number of measurements, the measurement result corresponding to the desired picture area is averaged for each channel and calculated as the spectral reflection intensity for the desired area.
The spectral reflectance of the calculated spectral reflection intensity I (λ) is calculated by the following equation. R (λ) = Rw (λ) × I (λ) / Iw (λ) [Equation 1] where R (λ): Spectral reflectance Rw (λ): Measured with an accurately graduated device Reflectance of reference white plate Iw (λ): Reflection intensity of the reference white plate measured by this apparatus.
【００２７】分光測定処理部２２で算出された分光反射
率は色調判断処理部２８に供給される。分光測定処理部
２２内部では上述の式にしたがって分光反射率を算出す
る。色調判断処理部２８は通常のパーソナルコンピュー
タ等からなり、分光測定処理部２２で処理された反射率
からＬａｂ色度、および各インキの最大吸収を示す波長
での分光濃度を算出する。ここで、分光濃度Ｄ（λ）は
次式であらわされる。 Ｄ（λ）＝ −ｌｏｇ１０Ｒ（λ） 〔式２〕 ここで、分光濃度差分ΔＤ（λ) は、基準とした分光濃
度と時々刻々と測定される分光濃度との差である。The spectral reflectance calculated by the spectral measurement processing section 22 is supplied to a color tone determination processing section 28. Inside the spectral measurement processing unit 22, the spectral reflectance is calculated in accordance with the above-described equation. The color tone determination processing unit 28 is composed of a normal personal computer or the like, and calculates the Lab chromaticity and the spectral density at the wavelength showing the maximum absorption of each ink from the reflectance processed by the spectral measurement processing unit 22. Here, the spectral density D (λ) is represented by the following equation. D (λ) = − log10R (λ) [Equation 2] Here, the spectral density difference ΔD (λ) is the difference between the reference spectral density and the spectral density measured every moment.
【００２８】算出したＬａｂ色度を用いて色差ΔＥを算
出し、印刷物の色調のずれを検出し、検出結果を分光濃
度差分と共に表示する表示部も有する。There is also a display unit for calculating a color difference ΔE using the calculated Lab chromaticity, detecting a color tone shift of a printed matter, and displaying the detection result together with a spectral density difference.
【００２９】次に、第１実施形態の動作を説明する。一
般に印刷においては、実際の印刷を行なう前に基準サン
プルを印刷し、これを基準として実際の印刷物（測定サ
ンプル）の色調を調整する。基準サンプルとしては顧客
の校閲済みの校正刷り、顧客の立会いの下に実際の印刷
を行い顧客の承認を得た印刷物、あるいは熟練した検査
者が確認した印刷物等が考えられるが、本発明では、実
際に印刷が始まり、上記いずれかの条件を満たした印刷
中の印刷物を基準サンプルとして使う。すなわち、所望
の色調が得られたら、色調判断処理部２８へ指示を入力
し、指示が入力された時点での測定値を基準とする。Next, the operation of the first embodiment will be described. Generally, in printing, a reference sample is printed before actual printing, and the color tone of an actual printed matter (measurement sample) is adjusted based on the reference sample. The reference sample may be a customer's redacted proof, a customer-approved printed matter that is actually printed in the presence of the customer, or a printed matter confirmed by a skilled inspector, but in the present invention, Printing is actually started, and a printed material that satisfies one of the above conditions during printing is used as a reference sample. That is, when a desired color tone is obtained, an instruction is input to the color tone determination processing unit 28, and a measurement value at the time when the instruction is input is used as a reference.
【００３０】色調管理装置２８には絵柄に対応するイン
キキーゾーンＺ１〜Ｚｎ毎の所望絵柄領域の分光反射率
が取り込まれる。インキキーゾーンの幅はインキキーの
幅であり、例えば３５ｍｍである。分光測定処理部２２
はロータリエンコーダ２４ａおよび２４ｂから出力され
る測定パルスに応じて測定を行う。The spectral reflectance of the desired picture region for each of the ink key zones Z1 to Zn corresponding to the picture is taken into the color tone management device 28. The width of the ink key zone is the width of the ink key, for example, 35 mm. Spectroscopic measurement processing unit 22
Performs measurement according to the measurement pulses output from the rotary encoders 24a and 24b.
【００３１】１回の測定では３５ｍｍ×７ｍｍの領域の
測定を行う。測定毎の測定値は単独で持っており、必要
な領域部分の測定値を積算平均して所望領域の分光反射
率を求める。こうして、基準サンプルの所望絵柄領域の
各インキキーゾーン毎の分光反射率（分光波形）が基準
波形として色調管理装置２８に入力される。In one measurement, an area of 35 mm × 7 mm is measured. The measured values for each measurement are independently held, and the measured values of the necessary region are integrated and averaged to obtain the spectral reflectance of the desired region. Thus, the spectral reflectance (spectral waveform) for each ink key zone in the desired picture region of the reference sample is input to the color tone management device 28 as a reference waveform.
【００３２】色調判断処理部２８は分光反射率波形に等
色関数を乗算して色彩値を求める。尚、色を数値で表わ
す表色系としては以下に示すように種々のものがある。
Ｌ* ａ* ｂ* 表色系、（国際照明委員会〔ＣＩＥ〕が規
定。ＣＩＥＬＡＢ系とも称される。） Ｃ* ｈ表色系、ハンターＬａｂ表色系、ＸＹＺ（Ｙｘ
ｙ）表色系、等である。The color tone judgment processing section 28 obtains a color value by multiplying the spectral reflectance waveform by a color matching function. It should be noted that there are various color systems for expressing colors by numerical values as described below.
L * a * b * color system (defined by the International Commission on Illumination [CIE]; also called CIELAB system) C * h color system, Hunter Lab color system, XYZ (Yx
y) color system, etc.
【００３３】どの表色系を用いてもよいが、ＣＩＥＬａ
ｂ系が人間の見た目と良く合うし、最もポピュラーであ
るので、ここではこれを使用する。すなわち、測定絵柄
部分のＬ* 値、ａ* 値、ｂ* 値が色彩値として求められ
る。ＣＩＥＬａｂ系では、明度をＬ、色相と彩度を示す
色彩値をａ* 、ｂ* で表わす。ａ* 、ｂ* は色の方向を
示しａ* は赤方向、−ａ* は緑方向、ｂ* は黄方向、−
ｂ* は青方向を示す。数値が大なるに従って色が鮮やか
になり、中心になるに従ってくすんだ色になる。なお、
彩度は（ａ*2＋ｂ*2）1/2 である。Although any color system may be used, CIELa
The b-system fits well with human appearance and is the most popular, so we use it here. That is, the L * value, a * value, and b * value of the measured picture portion are obtained as color values. In the CIELab system, lightness is represented by L, and hue and saturation are represented by a * and b * . a * and b * indicate the color direction, a * indicates the red direction, −a * indicates the green direction, b * indicates the yellow direction, −
b * indicates the blue direction. The higher the number, the more vivid the color, and the closer to the center, the duller the color. In addition,
The saturation is (a * 2 + b * 2 ) 1/2 .
【００３４】次に、後続する各印刷物（測定サンプル）
においても、基準サンプルの測定範囲と対応する範囲の
分光反射率を測定する。この時の分光波形も色調管理装
置２８に供給され、色彩値が求められる。Next, each subsequent printed matter (measurement sample)
Also, the spectral reflectance in the range corresponding to the measurement range of the reference sample is measured. The spectral waveform at this time is also supplied to the color tone management device 28, and a color value is obtained.
【００３５】こうして求められた基準サンプルと測定サ
ンプルの色彩値の差（Ｌ* ａ* ｂ*差、すなわちΔＥ*
ａｂ）を次のように求める。 ΔＥ* ａｂ＝｛（ΔＬ* ）2 ＋（Δａ* ）2 ＋（Δｂ* ）2 ｝1/2 〔式３〕 ここで、ΔＬ* はＬ* 値の差、Δａ* はａ* 値の差、そ
してΔｂ* はｂ* 値の差である。色差ΔＥ* ａｂを色調
のずれとして、もしこの色差が所定の閾値以上であると
きは、補正が必要であると判断して、表示部に基準値の
濃度差分と共にこれを表示する。The difference (L * a * b * difference, that is, ΔE * ) between the color values of the reference sample and the measurement sample thus determined .
ab) is determined as follows. ΔE * ab = ｛(ΔL * ) 2 + (Δa * ) 2 + (Δb * ) 2 ｝ 1/2 (Equation 3) Here, ΔL * is a difference between L * values, and Δa * is a difference between a * values. , And Δb * are the differences between the b * values. Assuming that the color difference ΔE * ab is a color tone shift, if the color difference is equal to or more than a predetermined threshold value, it is determined that correction is necessary, and this is displayed on the display unit together with the density difference of the reference value.
【００３６】作業者に色調ズレ情報を与えると共に、イ
ンキゾーンの位置関係と色差と分光濃度差分を適切に並
べ表示する事により、その修正すべき方向の指示を与え
る監視装置となる。オフセット輪転印刷機１０の操作者
は色調判断処理部２８のこの画面をみて、色調の変化が
所定の許容の範囲を越えた場合には、分光測定処理部２
２が測定し色調判断処理部２８が判断した色調の変化の
程度の応じて色調の変化が小さくなるよう、手動操作に
より印刷ユニット１０ｃにおけるシアンＣ，マゼンタ
Ｍ，イエローＹ、ブラックＢの４色のインキの為の例え
ばインキキーの如きインキ供給調節装置を調整すること
が出来る。By providing the operator with the color tone deviation information, and by appropriately arranging and displaying the positional relationship of the ink zones, the color difference and the spectral density difference, the monitor device gives an instruction of the direction to be corrected. The operator of the offset rotary printing press 10 looks at this screen of the color tone determination processing unit 28, and if the change in color tone exceeds a predetermined allowable range, the spectral measurement processing unit 2
2 by manual operation so that the change in the color tone becomes smaller in accordance with the degree of the change in the color tone measured by the color tone determination processing unit 28 and determined by the color tone determination processing unit 28. An ink supply control device, such as an ink key, for the ink can be adjusted.
【００３７】本発明は上述した実施形態に限定されず種
々変形して実施可能である。上述の説明では、測定アパ
ーチャーサイズをインキキー幅である３５ｍｍと７ｍｍ
としたが、このサイズを適せん目的のサイズに変更させ
れば、オフセット枚葉印刷機やグラビア輪転印刷機や巻
き返し時の絵柄色調監視装置として実施可能である。The present invention is not limited to the above-described embodiment, but can be implemented with various modifications. In the above description, the measurement aperture size is set to the ink key widths of 35 mm and 7 mm.
However, if this size is changed to a suitable size, it can be implemented as an offset sheet-fed printing press, a gravure rotary printing press, or a picture color tone monitoring device during rewinding.
【００３８】また、第２の実施形態としては、色差ΔＥ
* ａｂを色調のずれとして、この色差が所定の閾値以上
であれば、補正が必要と判断して、分光濃度差分を最小
に押さえるべく、この差に応じたＹ、Ｍ、Ｃ、Ｋの各色
のインキ量調整信号を各色の印刷ユニットのインキキー
へ開度制御信号として供給する。In the second embodiment, the color difference ΔE
If ab is a color shift and this color difference is equal to or greater than a predetermined threshold, it is determined that correction is necessary, and each color of Y, M, C, and K corresponding to the difference is determined to minimize the spectral density difference. Is supplied as an opening control signal to the ink keys of the printing units for each color.
【００３９】このため、色調管理装置２８は、Ｙ、Ｍ、
Ｃ、Ｋの分光濃度差分とインキキー開度との対応関係を
予め記憶してあるテーブルを参照して、インキ供給量を
補正する制御量を算出し、これらインキ供給量を補正す
る制御量をインキキーに反映させる。この為に、印刷機
のインキキーリモコン装置との通信を行うべき通信機能
を有するインキ供給量処理部により、実施形態１の色調
監視装置と組み合わせる事によって、自動的に絵柄色調
の変動に対する監視及び補正制御を自動的に行うことが
出来る。For this reason, the color tone management device 28
A control amount for correcting the ink supply amount is calculated with reference to a table in which the correspondence between the spectral density difference between C and K and the ink key opening degree is stored in advance, and the control amounts for correcting the ink supply amount are determined by the ink key. To reflect. For this purpose, the ink supply amount processing unit having a communication function for performing communication with the ink key remote control device of the printing press is automatically combined with the color tone monitoring device of the first embodiment to automatically monitor and correct the variation of the pattern color tone. Control can be performed automatically.
【００４０】なお、測定対象印刷物として、基準サンプ
ルに後続する全ての印刷物を測定すれば、色調の変動に
直ぐに対処できるが、色調の変動は緩やかであるし、イ
ンキキー開度を変化させても版胴上でのインキ量が変化
するまでに時間がかかるので、測定は数十〜百サンプル
毎でも構わない。It should be noted that if all the printed materials following the reference sample are measured as the prints to be measured, the change in the color tone can be dealt with immediately, but the change in the color tone is gradual. Since it takes time until the ink amount on the cylinder changes, the measurement may be performed every several tens to hundreds of samples.
【００４１】実際には、使用しているインキ中で最も濃
度差分が大きい物から補正すべきであるが、Ｂｋが存在
する場合には、まずＢｋに対応する分光濃度差分を最小
に押え込んだ上で、インキ量調節を所望の色差の範囲内
に収めるべく、他の３色インキ量を調節する。調節した
結果は上述したように時間がかかるので、監視および制
御を所望の印刷幅全域に対して行う事が出来る。Actually, the correction should be made from the ink having the largest density difference among the inks used. However, if Bk exists, the spectral density difference corresponding to Bk is first reduced to the minimum. Above, the ink amounts of the other three colors are adjusted so that the ink amount adjustment falls within a desired color difference range. Since the adjustment result takes time as described above, monitoring and control can be performed over the entire desired printing width.
【００４２】以上説明したように、第１の実施形態によ
れば、印刷機に分光測色計２２を取り付けることによ
り、走行中の印刷物の各インキキーに対応した所定の絵
柄領域の分光反射率を測定し、測定結果の色彩値を求
め、基準サンプルと測定サンプルとの色彩値の差に応じ
て色調のずれを検出することができる。このため、印刷
中に印刷物の色調のずれを直ちに検出し、インキ量の調
整を行うことができるので、大量の不良印刷物を発生す
ること無く、印刷物の色調を揃えることができる。As described above, according to the first embodiment, by attaching the spectral colorimeter 22 to the printing press, the spectral reflectance of a predetermined picture area corresponding to each ink key of a running printed matter can be reduced. The color value of the measurement result is measured, and a color tone shift can be detected according to the color value difference between the reference sample and the measurement sample. For this reason, the color tone deviation of the printed matter can be immediately detected during printing, and the ink amount can be adjusted, so that the color tone of the printed matter can be made uniform without generating a large amount of defective printed matter.
【００４３】高速で走行している印刷物の一点を測定す
るには特殊な測定器が必要になるが、本実施形態のよう
に所定の範囲の反射率を求めるには、特殊な測定器は必
要なく、簡単な構成の分光反射率計で色調のずれを検出
できる。また、第２実施形態のよれば、第１実施形態と
インキ量制御処理部とを連結・平行稼動させる事によ
り、自動で絵柄色調の監視・補正制御が出来る。A special measuring device is required to measure one point of a printed matter running at high speed, but a special measuring device is required to obtain a predetermined range of reflectance as in the present embodiment. In addition, a color tone shift can be detected with a spectral reflectance meter having a simple configuration. Further, according to the second embodiment, the image color tone can be automatically monitored and corrected by connecting and operating the first embodiment and the ink amount control processing unit in parallel.
【００４４】[0044]
【発明の効果】以上説明したように本発明によれば、下
記のような作用効果を奏する印刷色調測定装置を提供す
ることができる。印刷機に取付けられ、走行中の印刷物
の分光反射率を各インキキーに対応する所定の領域毎の
所望絵柄領域の色調を測定する手段と、基準となる印刷
物の所望領域の色度及び分光濃度と測定対象である印刷
物の所望領域の色度及び分光濃度とに基づいて印刷物の
色調を検査する手段とを具備することにより、簡単な構
成で印刷物の各色毎の色調変動を印刷中に測定し、これ
により迅速に手動インキ量調整もしくは自動補正制御を
行うことができる。As described above, according to the present invention, it is possible to provide a printing color tone measuring apparatus having the following functions and effects. A means for measuring the color tone of a desired picture area for each predetermined area corresponding to each ink key by measuring the spectral reflectance of the running printed matter and the chromaticity and spectral density of the desired area of the reference printed matter; Means for inspecting the color tone of the printed matter based on the chromaticity and the spectral density of the desired area of the printed matter to be measured, by measuring the color tone variation of each color of the printed matter during printing with a simple configuration, Thereby, manual ink amount adjustment or automatic correction control can be quickly performed.
【００４５】つまるところ、カラーパッチの印刷が不要
で印刷物の無駄を無くす事が出来ると共に、印刷物の絵
柄色調変動を印刷直後に常時連続して直接監視・保証す
る事が出来、監視情報から迅速に色調変動を調整できる
印刷色調制御装置を提供することが出来た。After all, it is not necessary to print color patches, and it is possible to eliminate waste of the printed matter, and it is also possible to directly and directly monitor and guarantee the change of the picture color tone of the printed matter immediately after printing, and to quickly obtain the color tone from the monitoring information. A printing color tone control device capable of adjusting the fluctuation can be provided.
【図１】本発明に関わる印刷色調測定装置の第１と第２
の各実施形態の構成を示すブロック図。FIG. 1 shows first and second printing color tone measuring devices according to the present invention.
FIG. 2 is a block diagram illustrating a configuration of each embodiment.
【図２】測定タイミング信号の一例と所望領域抽出を示
す図。FIG. 2 is a diagram showing an example of a measurement timing signal and extraction of a desired area.
【図３】測定のオーバーラップ状態を示す図。FIG. 3 is a diagram showing a measurement overlap state.
【図４】黒版の有無による分光反射率特性の違いを示す
図。FIG. 4 is a diagram showing a difference in spectral reflectance characteristics depending on the presence or absence of a black plate.
１０ａ・・・給紙部 １０ｂ・・・インフィード部 １０ｃ・・・印刷ユニット １０d ・・・乾燥部 １０ｅ・・・冷却部 １０ｆ・・・折り機 １１ ・・・ブランケット胴 １２ ・・・版胴 １５ ・・・インキ壷 １６ ・・・インキローラ １７ ・・・水舟 ２２ ・・・分光測定処理部 ２４ ・・・エンコーダ ２８ ・・・色調判断処理部 ３０ ・・・インキキーリモコン 10a ・ ・ ・ Paper feed section 10b ・ ・ ・ Infeed section 10c ・ ・ ・ Printing unit 10d ・ ・ ・ Drying section 10e ・ ・ ・ Cooling section 10f ・ ・ ・ Folding machine 11 ・ ・ ・ Blanket cylinder 12 ・ ・ ・ Print cylinder 15 ... Ink fountain 16 ... Ink roller 17 ... Watercraft 22 ... Spectral measurement processing unit 24 ... Encoder 28 ... Color tone judgment processing unit 30 ... Ink key remote control
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2C250 DB04 EA02 EA03 EA23 EB32 EB40 EB43 2G020 AA08 DA02 DA03 DA12 DA34 DA43 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C250 DB04 EA02 EA03 EA23 EB32 EB40 EB43 2G020 AA08 DA02 DA03 DA12 DA34 DA43
Claims (3)
れ、搬送中の印刷物の所望の絵柄領域の色調を監視する
装置であって、 （イ）所望の印刷単位周期毎に、印刷方向に対して測定
アパーチャー領域を複数オーバーラップしながら印刷全
面を複数分割測定が可能な測定手段、 （ロ）該所望絵柄領域に対応する分割区間内で測定され
た分光反射強度を積算平均化し、該所望絵柄領域の分光
反射強度とし、該所望絵柄領域に対応する分光反射率を
算出する分光反射率算出手段、 （ハ）算出された分光反射率から色座標変換によって色
度を算出すると共に、所望波長領域での分光濃度を算出
する分光濃度算出手段、 （ニ）良好な色調と判断された色度と分光濃度を基準値
として記憶する基準値記憶手段、 （ホ）時々刻々と測定算出された測定値と該基準値とか
ら、色差ならびに濃度差分を算出し、色差による許容範
囲設定により、色調変動による良品か要修正品かを判断
する色調判断処理手段、以上の（イ）乃至（ホ）を全て
具備したことを特徴とする絵柄色調監視装置。1. A device for monitoring the color tone of a desired picture area of a printed material being transported, which is attached to a vicinity of a printed material transporting path of a printing machine, comprising: On the other hand, a measuring means capable of dividing the entire print surface into a plurality of portions while overlapping a plurality of measurement aperture regions, (b) integrating and averaging the spectral reflection intensities measured in the divided sections corresponding to the desired picture region, and Spectral reflectance calculating means for calculating the spectral reflectance corresponding to the desired picture area as the spectral reflection intensity of the picture area, (c) calculating the chromaticity from the calculated spectral reflectance by color coordinate conversion, and Spectral density calculating means for calculating the spectral density in the region; (D) reference value storing means for storing the chromaticity and the spectral density determined to be good color tones as reference values; (E) Measurements calculated every moment A color difference and a density difference are calculated from the reference value and the reference value, and a color tone determination processing means for determining whether the product is a non-defective product or a product requiring correction by setting an allowable range based on the color difference. A picture color tone monitoring device, comprising:
搬送中の印刷物の所望絵柄領域の色調変動による印刷物
の良品か要修正品かの判断結果の情報に基づき、 （ヘ）色調が修正を要すると判断した場合に、該濃度差
分値より色調変動を修正すべく、インキ供給量を補正す
る制御量を算出する手段と （ト）算出した制御補正量をインキ供給量制御装置に送
出する手段とを具備したインキ供給量処理部 以上の（ヘ）及び（ト）を全て具備したことを特徴する
印刷色調制御装置。2. The printer is mounted in a printed matter transport path of a printing press,
(F) When it is determined that the color tone needs to be corrected based on the information on the result of the determination as to whether the printed material is good or requires correction due to the color tone variation of the desired picture area of the printed material being conveyed, (C) an ink supply amount processing unit including means for calculating a control amount for correcting the ink supply amount, and means for sending the calculated control correction amount to the ink supply amount control device. (G) A printing color tone control device characterized by having all of (g).
品かの情報として、請求項１に記載の絵柄色調監視装置
で判断した結果を採用することを特徴とする請求項２に
記載の印刷色調制御装置。3. The printing method according to claim 2, wherein a result determined by the picture color tone monitoring device according to claim 1 is adopted as information on whether the printed matter is a good product or a product requiring correction due to the color tone fluctuation. Color control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11197411A JP2001018364A (en) | 1999-07-12 | 1999-07-12 | Design color tone monitoring apparatus and print color tone controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11197411A JP2001018364A (en) | 1999-07-12 | 1999-07-12 | Design color tone monitoring apparatus and print color tone controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001018364A true JP2001018364A (en) | 2001-01-23 |
Family
ID=16374078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11197411A Pending JP2001018364A (en) | 1999-07-12 | 1999-07-12 | Design color tone monitoring apparatus and print color tone controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001018364A (en) |
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| JP2002225231A (en) * | 2001-01-29 | 2002-08-14 | Toppan Printing Co Ltd | Monitoring device for pattern color-tone and control device for printing color tone |
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