JP2831159B2 - Color tone control device for printed matter - Google Patents
Color tone control device for printed matterInfo
- Publication number
- JP2831159B2 JP2831159B2 JP3118473A JP11847391A JP2831159B2 JP 2831159 B2 JP2831159 B2 JP 2831159B2 JP 3118473 A JP3118473 A JP 3118473A JP 11847391 A JP11847391 A JP 11847391A JP 2831159 B2 JP2831159 B2 JP 2831159B2
- Authority
- JP
- Japan
- Prior art keywords
- color
- color coordinates
- printing
- ink
- calculating
- 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.)
- Expired - Fee Related
Links
- 238000012937 correction Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 14
- 239000003086 colorant Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 238000000611 regression analysis Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 239000000976 ink Substances 0.000 description 63
- 235000000177 Indigofera tinctoria Nutrition 0.000 description 9
- 229940097275 indigo Drugs 0.000 description 9
- COHYTHOBJLSHDF-UHFFFAOYSA-N indigo powder Natural products N1C2=CC=CC=C2C(=O)C1=C1C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-UHFFFAOYSA-N 0.000 description 9
- 230000015654 memory Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 230000014509 gene expression Effects 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000000491 multivariate analysis Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、印刷機械のインキ供給
装置に適用される色調安定化の為の自動制御装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic control device for stabilizing color tone applied to an ink supply device of a printing machine.
【0002】[0002]
【従来の技術】多色印刷においては、周囲の温湿度変化
や印刷機械のローラの発熱による温度変化等の影響によ
り、インキの粘度、印刷圧力、インキ中の湿し水の含有
量等が変化し、その結果、印刷物の色調が経時変化す
る。この色調の変化が大きくなり、見本刷り(例えば、
校正刷り)との色の差が極端になると、色調不良と見な
される。この色調不良を防止する為、印刷中にオペレー
タは常時印刷物の全面を監視し、色調を保持する為の調
整を行わざるを得なかった。2. Description of the Related Art In multicolor printing, the viscosity of ink, printing pressure, the content of dampening water in ink, and the like change due to changes in ambient temperature and humidity and changes in temperature due to heat generated by rollers of a printing machine. As a result, the color tone of the printed matter changes over time. This change in color tone increases, and sample printing (for example,
If the difference between the color and the proof print becomes extremely large, it is regarded as poor color tone. In order to prevent such poor color tone, the operator must constantly monitor the entire surface of the printed material during printing and make adjustments to maintain the color tone.
【0003】このような状態を改善すべく、自動的に色
調を制御する装置が幾つか提案されている。提案されて
いる装置は大別して、次の2つに分類できる。一つは、
印刷監視ストリツプを用いるものである。これは、印刷
物の余白に各使用インキ色のベタパツチなどを含む印刷
監視用の特殊ストリツプを同時に印刷し、このストリツ
プ上の各パツチの色濃度や色座標を計測し、その値が目
標のものに一致するように各色のインキ供給量を調整す
るものである。例えば、特開昭63−141745、6
3−145035、63−166541、特開平01−
53845号などがこれに係わる発明である。In order to improve such a situation, there have been proposed some devices for automatically controlling the color tone. Proposed devices can be broadly classified into the following two types. one,
A print monitoring strip is used. This involves printing simultaneously a special strip for monitoring the printing, including the solid patches of each ink color used, in the margins of the printed material, measuring the color density and color coordinates of each patch on this strip, and setting the values to the target values. The ink supply amounts of the respective colors are adjusted so as to match. For example, JP-A-63-141745, 6
3-145035; 63-166541;
No. 53845 is an invention relating to this.
【0004】残る一つは、上記の印刷監視ストリツプを
用いないものである。これは、刷り上がった印刷物の色
濃度や色座標を直接に計測し、その値が目標のものに一
致するように、各色のインキ供給量を調整するものであ
る。例えば、特開平01−218835号などがこれに
係わる発明である。The other one does not use the above-described print monitoring strip. In this method, the color density and color coordinates of the printed matter are directly measured, and the ink supply amounts of the respective colors are adjusted so that the values match the target values. For example, Japanese Patent Application Laid-Open No. H01-218835 is an invention relating to this.
【0005】[0005]
【発明が解決しようとする課題】印刷監視ストリツプを
用いるものは、次の3つの問題点があり、広く普及して
いない。 (1)印刷会社では用紙の有効利用の為、用紙の全面を
使って印刷されることが多く、ストリツプを入れる余白
が無い事が多い。 (2)余白にストリツプを入れる事自体、印刷の前工程
である製版工程において余分な作業時間を必要とし、能
率上好ましくない。 (3)上記(1)項の状況から、ストリツプの面積は小
さくならざるを得ないが、広い印刷面の色調をこの小さ
な計測対象のストリツプから推定するという不正確さを
含んでいる。The method using the print monitoring strip has the following three problems and has not been widely used. (1) In a printing company, printing is often performed using the entire surface of the paper in order to make effective use of the paper, and there is often no margin for inserting a strip. (2) Stripping the margin itself requires extra work time in the plate making process which is a pre-printing process, which is not preferable in terms of efficiency. (3) Although the area of the strip has to be reduced from the situation described in the above item (1), there is an inaccuracy in that the color tone of a wide print surface is estimated from the small strip to be measured.
【0006】一方、印刷監視ストリツプを用いないもの
には、上記の3つの問題点はないが、下記のように墨イ
ンキによる色の変化分の分離がほとんど不可能であると
いう大きな問題がある。印刷においては墨,藍,紅,黄
の4色のインキですべての色を再現する為、絵柄上では
藍,紅,黄の各インキの刷り重ねによる黒と、墨インキ
単独による黒とが混在している。このような場合、従来
の方法による3つの色座標の単純な計測によれば、藍,
紅,黄の各インキの適当な刷り重ねによる黒の部分でイ
ンキ供給量が変化した時の3つの色座標検出値の変化
と、墨インキのみによる黒の部分でインキ供給量が変化
した時のそれが同じ様に生じる。On the other hand, those which do not use the print monitoring strip do not have the above three problems, but have a serious problem that it is almost impossible to separate a change in color by black ink as described below. In printing, all colors are reproduced with four inks of black, indigo, red, and yellow. Therefore, on the pattern, black by overprinting of indigo, red, and yellow inks and black by black ink alone are mixed. doing. In such a case, the simple measurement of the three color coordinates by the conventional method shows that
The change in the three color coordinate detection values when the ink supply amount changes in the black portion due to the appropriate overprinting of the red and yellow inks, and the change in the ink supply amount in the black portion using only the black ink It happens in the same way.
【0007】この為、任意の黒の部分の色変化がどちら
が原因によって生じたかの区別がほとんど不可能とな
る。従って、4つのインキ修正量を見つける事が不可能
である。一般的に云えば、任意の箇所のO.Kシート
(制御の目標となるべき良好な印刷物)との3つの色座
標差、例えばXYZ色座標を用いるとΔX,ΔY,ΔZ
は、墨,藍,紅,黄の4つのインキ膜厚変化(ΔK,Δ
C,ΔM,ΔY)により生じている。[0007] For this reason, it is almost impossible to distinguish which of the causes caused the color change of an arbitrary black portion. Therefore, it is impossible to find four ink correction amounts. Generally speaking, the O.D. Using three color coordinate differences from a K sheet (good printed matter to be a control target), for example, using XYZ color coordinates, ΔX, ΔY, ΔZ
Are the four ink film thickness changes (ΔK, ΔK,
C, ΔM, ΔY).
【0008】数式表現すれば次のようである。The following is a mathematical expression.
【0009】[0009]
【数1】 (Equation 1)
【0010】[0010]
【数2】 (Equation 2)
【0011】[0011]
【数3】 但し、FX 〜FZ はインキ膜厚変化をおのおのX,Y,
Zの色座標変化に関係づける関数である。制御において
は、上式とは逆にΔX,ΔY,ΔZからΔK,ΔC,Δ
M,ΔYを求める必要があるが、明らかに、未知数(4
個)に比べて方程式の数(3個)が少なく、解けない。(Equation 3) However, F X to F Z indicate changes in the ink film thickness in X, Y, and X, respectively.
This is a function related to a change in the color coordinates of Z. In the control, contrary to the above equation, ΔK, ΔC, ΔZ are obtained from ΔX, ΔY, ΔZ.
Although M and ΔY need to be obtained, it is apparently unknown (4
), The number of equations (3) is small and cannot be solved.
【0012】この為、この方式のもので実用化している
ものは無い。本発明は、印刷管理ストリツプを用いない
時に生じる上記の問題点を解決する手段の提供を目的に
するものである。For this reason, there is no practical use of this method. SUMMARY OF THE INVENTION It is an object of the present invention to provide a means for solving the above-mentioned problem that occurs when a print management strip is not used.
【0013】[0013]
【課題を解決するための手段】(1)印刷方向に印刷面
を仮想的にn分割(n≧2)したそれぞれの分割区間に
おいて、X,Y,Zのおのおのの色座標毎に、その分割
空間での平均色座標を印刷中に検出する手段を設ける。 (2)この各分割区間毎に求められた色座標と目標の色
座標の差(3×n個)と、予めの計測により求められる
印刷に使用されている複数(通常は墨,藍,紅,黄の4
色)のインキ色毎の上記の各分割区間における画線率
(使用インキ色数×n)とを基に、時々刻々得られる印
刷物の色座標を記憶された目標色座標に一致させるに必
要な各色のインキ供給膜厚の修正量を重回帰分析の手法
により演算する手段を設ける。(1) In each divided section in which the printing surface is virtually divided into n parts (n ≧ 2) in the printing direction, the division is performed for each of the X, Y, and Z color coordinates. Means are provided for detecting the average color coordinates in space during printing. (2) The difference (3 × n) between the color coordinates obtained for each of the divided sections and the target color coordinates and the plurality (usually black, indigo, and red) used for printing obtained by measurement in advance. , Yellow 4
Based on the image ratio (the number of used ink colors × n) in each of the divided sections for each of the ink colors (color), it is necessary to match the color coordinates of the printed material obtained every moment with the stored target color coordinates. Means are provided for calculating the correction amount of the ink supply film thickness of each color by a multiple regression analysis technique.
【0014】[0014]
【作用】前記手段(1)項の採用により得られる色座標
情報が、従来の3個から3n個に増加する。その結果、
得られる数式関係の数(3n個)が未知数であるインキ
膜厚変化の数(4個)より多くなる。即ち、次に示す様
である。The color coordinate information obtained by adopting the means (1) is increased from 3 to 3n. as a result,
The number (3n) of the obtained mathematical relations is larger than the number (4) of the ink film thickness changes which are unknown. That is, it is as follows.
【0015】[0015]
【数4】 但し、添え字の1〜nはおのおのの分割区間(1〜n区
間)の色座標と関数であることを示す。今度は、逆に未
知数に対して数式の数が過剰であるが、前記手段(2)
項に示す重回帰分析の手法(その詳細については、奥野
忠一 他 著「多変量解析法」(株)日科技連出版社
発行 等に記述されている。)を応用した演算装置によ
り、精度良く、未知数であるインキ膜厚の変化量、即
ち、インキ膜厚の修正量(変化量の正負の符号を反転し
たもの)が推定できる。(Equation 4) However, the suffixes 1 to n indicate that they are color coordinates and functions of the respective divided sections (1 to n sections). This time, conversely, the number of mathematical expressions is excessive with respect to the unknowns.
Method of multiple regression analysis shown in the section (for details, see Chuno Okuno et al., “Multivariate Analysis Method”, Nikka Giren Publishing Co.
It is described in the publication. ) Can accurately and accurately estimate an unknown change amount of the ink film thickness, that is, a correction amount of the ink film thickness (a change amount obtained by inverting the sign of the change amount).
【0016】尚、上のインキ膜厚の変化量を求める演算
装置には、インキ色毎の各分割区間における画線率をも
入力するが、これによって、数4に示す関数FX1〜FZn
が定量的に決定される。The arithmetic unit for determining the change in the ink film thickness also inputs the image ratio in each divided section for each ink color, whereby the functions F X1 to F Zn shown in Equation 4 are obtained.
Is quantitatively determined.
【0017】[0017]
【実施例】以下、図面を参照しつつ枚葉印刷機での実施
例を説明する。図1は本発明に係わる色調制御装置の一
構成例を示すブロツク線図である。図2は色座標検出部
の例を示す図である。図3は印刷紙の上面から見た様子
を示したものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in a sheet-fed printing press will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a color tone control device according to the present invention. FIG. 2 is a diagram illustrating an example of the color coordinate detection unit. FIG. 3 shows the printing paper viewed from above.
【0018】色の検出は、最終色の圧胴14上の印刷紙
16に対して行う。キセノンランプ等からなる光源3か
らの光は、光フアイバー11を通って印刷紙16の表面
(印刷面)を照射する。光フアイバー11は印刷機内部
の限られた狭い空間に光を導き、かつカラーラインカメ
ラ1の検出領域に合った帯状光源を作る役目も持ってい
る。図2に示す様に印刷面からの法線方向に対して約4
5度の角度で照射するように光フアイバー11が設置さ
れる。一方、カラーラインカメラ1は印刷面からの法線
方向の反射光を受光すべく設置され、図3に示す様にそ
の検出領域は幅方向には全幅、走行方向には1mm〜数
mmである。即ち、1ラインの検出領域は、(印刷用紙
幅)×(1mm〜数mm)である。カラーラインカメラ
1の内部には、XYZ系の等色関数と同様な透過パター
ンをもつフイルタが付された3つの受光部があり、それ
ぞれ印刷紙の1〜数mmの微小領域のX,Y,Zの色座
標の大小に応じた電気信号を各ライン毎に発生する。The color detection is performed on the printing paper 16 on the impression cylinder 14 of the final color. Light from the light source 3 such as a xenon lamp passes through the optical fiber 11 and irradiates the surface (printing surface) of the printing paper 16. The optical fiber 11 also has a role of guiding light to a limited narrow space inside the printing press and creating a belt-like light source that matches the detection area of the color line camera 1. As shown in FIG. 2, about 4 normal directions from the printing surface
The optical fiber 11 is installed so as to emit light at an angle of 5 degrees. On the other hand, the color line camera 1 is installed to receive the reflected light in the normal direction from the printing surface, and its detection area is full width in the width direction and 1 mm to several mm in the running direction as shown in FIG. . That is, the detection area of one line is (print paper width) × (1 mm to several mm). Inside the color line camera 1, there are three light receiving sections provided with filters having a transmission pattern similar to the color matching function of the XYZ system. An electric signal corresponding to the magnitude of the color coordinate of Z is generated for each line.
【0019】ライン毎の各微小領域(約1,000個)
のX,Y,Z色座標の大小に応じた電気信号は順次、色
座標検出装置2に送られ、そこで各インキキー領域毎に
割り振られ、各インキキーのX,Y,Zの3つの『現在
値メモリ』の所定の位置に記憶される。印刷紙16の走
行に従い、カラーラインカメラ1の検出領域は順次変化
し、結果として印刷紙16の全面を碁盤目状の検出単位
に分割して、対応するインキキーの3つの色座標の『現
在値メモリ』(図4の19,20,21)に記憶でき
る。Each minute area for each line (about 1,000)
Are sequentially sent to the color coordinate detecting device 2, where they are allocated to each ink key area, and the three "current values" of X, Y, Z of each ink key are assigned. In the memory. As the printing paper 16 travels, the detection area of the color line camera 1 sequentially changes. As a result, the entire surface of the printing paper 16 is divided into grid-like detection units, and the “current value” of the three color coordinates of the corresponding ink key is displayed. Memory "(19, 20, 21 in FIG. 4).
【0020】機械速度が変わるなどの外乱に対しても印
刷紙のある位置の信号がいつも同一のメモリ位置に記憶
されるべく同期装置が必要である。同期信号は、例えば
最終色の圧胴軸に取り付けたロータリエンコーダ(R/
E)から作り出せる。R/Eは、1パルス/回転と1,
500パルス/回転の2種のパルス信号のものを準備
し、それぞれ入力スタート信号(紙の前端に合わせる)
と細分割同期信号とする。このような同期信号を用いた
一般的な方法により紙面上において約1mmピツチで信
号を取り込み、機械速度が変わっても取り込み位置がず
れることは無い。A synchronizing device is required so that a signal at a certain position of the printing paper is always stored in the same memory location even when a disturbance such as a change in machine speed occurs. The synchronization signal is, for example, a rotary encoder (R / R) attached to the impression cylinder shaft of the final color.
E). R / E is 1 pulse / rotation and 1,
Prepare two types of pulse signals of 500 pulses / rotation, and input start signals (match to the front edge of paper)
And a subdivision synchronization signal. A signal is captured at a pitch of about 1 mm on the paper by a general method using such a synchronization signal, and the capturing position does not shift even if the machine speed changes.
【0021】上記の『現在値メモリ』19,20,21
を基に、平均色座標演算装置4では、各インキキー毎に
印刷方向(印刷紙の走行方向)に印刷面を仮想的にn分
割(n≧2)したそれぞれの分割空間での平均色座標を
算出する。この平均色座標の算出はX,Y,Zそれぞれ
の色座標に対して行われる。図5に示すある1つのイン
キキー領域の『現在値メモリ』(X)からの算出を例に
とり説明する。この場合、n=4であり、それぞれの分
割区間の微小領域での色座標検出信号(Xi)のメモリ
数はM個であるので、多分割区間での平均色座標
(X1,X2 ,X3 ,X4 )は次の様になる。The above "current value memory" 19, 20, 21
The average color coordinate calculation device 4 calculates the average color coordinates in each divided space obtained by virtually dividing the printing surface into n parts (n ≧ 2) in the printing direction (printing paper running direction) for each ink key. calculate. The calculation of the average color coordinates is performed for each of the X, Y, and Z color coordinates. A description will be given by taking as an example the calculation from a “current value memory” (X) of one ink key area shown in FIG. In this case, n = 4, and the number of memories of the color coordinate detection signal (Xi) in the minute area of each divided section is M, so that the average color coordinates (X 1 , X 2 , X 3 , X 4 ) are as follows.
【0022】[0022]
【数5】 但し、Xiの付番iは紙の前端から1,2,3,…とし
た。残る2つの色座標についても(数5)に準じて同様
に算出される。このように平均色座標演算装置4で算出
された平均色座標信号は、それが制御の目標となるべき
良好な印刷物(O.Kシート)に対してのものであれ
ば、図1に示すスイツチ5はA側に接続されて目標色座
標記憶装置6に格納される。一方、算出された平均色座
標信号が制御の対象となっている印刷物に対してのもの
であれば、スイツチ5はB側に接続されて色座標差演算
装置7に送られる。尚、このスイツチ5は例えば色見台
上に設置され、印刷オペレータにその切り替えが委ねら
れる。(Equation 5) However, the number i of Xi is 1, 2, 3,... From the front end of the paper. The remaining two color coordinates are similarly calculated according to (Equation 5). If the average color coordinate signal calculated by the average color coordinate calculation device 4 is for a good printed matter (OK sheet) to be a control target, the switch shown in FIG. 5 is connected to the A side and stored in the target color coordinate storage device 6. On the other hand, if the calculated average color coordinate signal is for a printed material to be controlled, the switch 5 is connected to the B side and sent to the color coordinate difference calculation device 7. The switch 5 is installed on a light booth, for example, and its switching is entrusted to a printing operator.
【0023】スイツチ5がA側に接続されると自動的に
スイツチ05は0A側に接続されて色座標差演算装置7
と離され、インキキーの開閉による調節は行われない。
一方、スイツチ5がB側に接続されるとスイツチ05は
自動的に0B側に接続され、格納されている目標色座標
の信号が色座標差演算装置7に送られる。制御期間中の
動きに注目すると、スイツチ5,05がそれぞれB,0
Bに接続されており、制御の対象となっている印刷物の
各分割区間毎の平均色座標(X1 〜Zn )信号とそれに
対応する区間の目標色座標(X1′〜Zn ′)信号がそ
れぞれ色座標差演算装置7に送られる。色座標差演算装
置7では、上の2つの色座標の差が算出される。When the switch 5 is connected to the A side, the switch 05 is automatically connected to the 0A side and the color coordinate difference calculating device 7 is connected.
The adjustment is not performed by opening and closing the ink key.
On the other hand, when the switch 5 is connected to the B side, the switch 05 is automatically connected to the 0B side, and the stored signal of the target color coordinates is sent to the color coordinate difference calculating device 7. When attention is paid to the movement during the control period, switches 5 and 05 are B and 0 respectively.
B, an average color coordinate (X 1 -Z n ) signal for each divided section of the printed material to be controlled and target color coordinates (X 1 ′ -Z n ′) of the corresponding section. The signals are respectively sent to the color coordinate difference calculation device 7. The color coordinate difference calculating device 7 calculates a difference between the above two color coordinates.
【0024】[0024]
【数6】 算出された色座標差の信号はインキ供給膜厚修正量の演
算装置8に送られる。次に、このインキ供給膜厚修正量
の演算装置8での演算の内容について説明する。色座標
差とインキ膜厚差の関係は、色座標をX、インキを藍に
代表させれば、(Equation 6) The signal of the calculated color coordinate difference is sent to the calculating device 8 for the ink supply film thickness correction amount. Next, the contents of the calculation of the ink supply film thickness correction amount by the calculation device 8 will be described. The relationship between the color coordinate difference and the ink film thickness difference is represented by X representing the color coordinate and indigo representing the ink.
【0025】[0025]
【数7】 と近似できる。ここで、Ac は藍の画線率であり、
axc,bxcは実験的に求められる定数である。(数7)
の右辺の(axc・Ac +bxc)をFxcとすれば、(数
7)は(Equation 7) Can be approximated. Here, Ac is the image ratio of indigo,
a xc and b xc are constants experimentally obtained. (Equation 7)
Assuming that (a xc · A c + b xc ) on the right side of is F xc , ( Equation 7) becomes
【0026】[0026]
【数8】 となる。微小領域の変動により線形性が保たれると仮定
し、この式を墨,藍,紅,黄(K,C,M,Y)の4色
に拡張すると(Equation 8) Becomes Assuming that the linearity is maintained by the fluctuation of the minute area, this equation can be extended to four colors of black, indigo, red, yellow (K, C, M, Y).
【0027】[0027]
【数9】 となる。これは、ある分割区間の色座標Xに関する議論
であったが、n分割区間の3つの色座標について拡張す
れば次式の様となる。(Equation 9) Becomes This is a discussion on the color coordinates X of a certain divided section. However, if the three color coordinates of the n divided sections are extended, the following equation is obtained.
【0028】[0028]
【数10】 求めるインキ膜厚の修正量はインキ供給膜厚差ΔK,Δ
C,ΔM,ΔYの正負の符号を反転したものであるの
で、インキ供給膜厚差を求める必要がある。本発明では
前述の様に(数8)に重回帰分析の手法を用いる事によ
り求める。具体的には、(数10)の各式を次の重回帰
モデルの3n個の(Equation 10) The required correction amount of the ink film thickness is the ink supply film thickness difference ΔK, Δ
Since the positive and negative signs of C, ΔM, and ΔY are inverted, it is necessary to find the difference in the ink supply film thickness. In the present invention, as described above, it is obtained by using the method of multiple regression analysis in (Equation 8). Specifically, each expression of (Equation 10) is converted into 3n number of the following multiple regression models.
【0029】[0029]
【数11】 データ群と解釈し、FDK〜FDYを4個の説明変数とし、
ΔDを目的変数とし、(数10)の3n個のデータ群に
対して重回帰分析を行う事により、求めるインキ供給膜
厚差ΔK,ΔC,ΔM,ΔYは、4個の偏回帰係数とし
て算出される。インキ供給膜厚修正量の演算装置8で
は、この重回帰分析を行いインキ供給膜厚差ΔK,Δ
C,ΔM,ΔYを算出し、その符号を逆転し、インキ供
給量(インキキー開閉)調節装置10に、その信号を送
る。[Equation 11] Interprets the data group, the four explanatory variables F DK to F DY,
Using ΔD as an objective variable and performing multiple regression analysis on 3n data groups of (Equation 10), the ink supply film thickness differences ΔK, ΔC, ΔM, and ΔY to be calculated are calculated as four partial regression coefficients. Is done. The ink supply film thickness correction amount calculating device 8 performs the multiple regression analysis to perform the ink supply film thickness difference ΔK, Δ
C, ΔM, ΔY are calculated, the signs are reversed, and the signals are sent to the ink supply amount (ink key opening / closing) adjusting device 10.
【0030】また、平均画線率計測装置9からは各色
の、各分割区間での平均画線率(g)が入力される。
(図1参照)このデータは印刷絵柄が変わる毎に更新さ
れる。説明変数FDK〜FDYはその値(g)に従い演算さ
れ、重回帰分析を行う前に入力されている。インキ供給
量(インキキー開閉)調節装置10は、例えばPID調
節器に類似するものであり、送られてきたインキ供給膜
厚修正量(−ΔK,−ΔC,−ΔM,−ΔY)を偏差信
号として受け、目標色座標との偏差を零とするインキキ
ーの開閉信号を演算し、これによりインキキーを開閉
し、実用上十分な精度で印刷紙面の色調を常に目標値に
一致させ得る。The average image ratio (g) of each color in each divided section is input from the average image ratio measurement device 9.
(See FIG. 1.) This data is updated each time the print pattern changes. The explanatory variables F DK to F DY are calculated according to the values (g) and are input before performing the multiple regression analysis. The ink supply amount (ink key opening / closing) adjustment device 10 is similar to, for example, a PID controller, and the received ink supply film thickness correction amount (−ΔK, −ΔC, −ΔM, −ΔY) is used as a deviation signal. Then, an ink key opening / closing signal that makes the deviation from the target color coordinate zero is calculated, whereby the ink key is opened / closed, and the color tone of the printing paper surface can always be matched with the target value with sufficient practical accuracy.
【0031】尚、以上の実施例は印刷に用いる色数が
墨,藍,紅,黄の4色であるが、色数に関係なく同様に
色調の制御が可能である。但し、重回帰分析を使用して
いる事から、分割区間の数をnとした場合、次の条件を
満たす必要がある。 3n>色数 また、場合によっては、上述の実施例の様にインキ供給
量を自動制御する事なく、インキ修正量をオペレータに
表示するだけのものも考えられる。この場合、図1のイ
ンキ供給量調節装置10に代えてインキ修正量の表示装
置が必要となる。In the above embodiment, the number of colors used for printing is four colors of black, indigo, red, and yellow, but the color tone can be similarly controlled regardless of the number of colors. However, since multiple regression analysis is used, the following condition must be satisfied when the number of divided sections is n. 3n> number of colors In some cases, the ink correction amount may be simply displayed to the operator without automatically controlling the ink supply amount as in the above-described embodiment. In this case, a display device for the ink correction amount is required instead of the ink supply amount adjusting device 10 in FIG.
【0032】[0032]
【発明の効果】本発明による印刷物の色調制御装置は、
印刷方向に印刷面を仮想的にn分割(n≧2)し、3つ
の独立した色座標毎に、その分割区間で平均した色座標
値を印刷中に検出する検出手段と、制御の目標となるべ
き良好な印刷物(O.Kシート)が得られた時点で、上
記の各分割毎に検出された平均色座標を目標色座標とし
て、記憶する記憶手段と、制御期間中、時々刻々、前記
検出手段により検出された色座標と前記記憶手段により
記憶された目標色座標とを比較し、その差を演算する演
算手段と、各分割区間毎に演算により求められた色座標
の差(3×n個)と予めの計測により求められる印刷に
使用されている複数(通常は墨,藍,紅,黄の4色)の
インキ色毎の各分割区間における平均画線率(使用イン
キ色数×n個)を基に、時々刻々得られる印刷物の色座
標を記憶された目標色座標に一致させるに必要な各色の
インキ供給膜厚の修正量を重回帰分析の手法により演算
する演算手段と、インキ供給膜厚の修正量を偏差信号と
して受け、この偏差を零とすべく、インキの供給量を調
節する手段とを具えたことにより、次の効果を有する。According to the present invention, there is provided a color tone control apparatus for a printed matter,
A detection unit that virtually divides a printing surface into n parts in the printing direction (n ≧ 2), and detects, during printing, color coordinate values averaged in the divided sections for each of three independent color coordinates; When a good printed matter (OK sheet) to be obtained is obtained, a storage means for storing the average color coordinates detected for each of the above-described divisions as target color coordinates; and A calculation means for comparing the color coordinates detected by the detection means with the target color coordinates stored by the storage means and calculating the difference, and a difference (3 × 3) between the color coordinates obtained by calculation for each divided section. n) and the average image ratio (the number of used ink colors × the number of used inks) in each divided section for each of a plurality of ink colors (normally, four colors of black, indigo, indigo, red, and yellow) used for printing obtained by measurement in advance. n) based on the color coordinates of the printed matter obtained moment by moment Calculating means for calculating the correction amount of the ink supply film thickness of each color required to match the color coordinates by a method of multiple regression analysis, and receiving the correction amount of the ink supply film thickness as a deviation signal, and setting the deviation to zero. And means for adjusting the supply amount of the ink, the following effects can be obtained.
【0033】印刷面全体の色調を実用上十分な精度で、
常に目標のそれに自動的に一致させる事が可能となる。
この結果、印刷オペレータは頻繁に色調を検査する作業
から開放される。また、本発明によれば印刷監視ストリ
ツプを印刷物の余白に入れる必要がなく、これに伴う余
分な作業時間や印刷用紙が不必要となる。The color tone of the entire printing surface can be adjusted with sufficient accuracy for practical use.
It is always possible to automatically match the target.
As a result, the printing operator is released from the work of frequently checking the color tone. Further, according to the present invention, it is not necessary to put the print monitoring strip in the margin of the printed matter, and thus extra working time and printing paper are not required.
【図1】本発明の第1実施例に係わる色調制御装置のブ
ロツク線図である。FIG. 1 is a block diagram of a color tone control device according to a first embodiment of the present invention.
【図2】色座標検出部の例を示す図である。FIG. 2 is a diagram illustrating an example of a color coordinate detection unit.
【図3】色座標検出部の例を印刷紙の上面から見た図で
ある。FIG. 3 is a diagram illustrating an example of a color coordinate detection unit as viewed from above a printing paper.
【図4】色座標の『現在値メモリ』の説明図である。FIG. 4 is an explanatory diagram of a “current value memory” of color coordinates.
【図5】『現在値メモリ』の印刷方向分割の説明図であ
る。FIG. 5 is an explanatory diagram of print direction division of a “current value memory”.
1 カラーラインカメラ 2 各インキキー毎の色座標検出装置 4 各分割区間での平均色座標演算装置 6 基準色座標記憶装置 7 色座標差演算装置 8 各色のインキ供給膜厚修正量の演算装置 9 各色のインキの各分割区間での平均画線率計測装置 10 インキ供給量(インキキー開閉)調節装置 DESCRIPTION OF SYMBOLS 1 Color line camera 2 Color coordinate detection device for each ink key 4 Average color coordinate calculation device in each divided section 6 Reference color coordinate storage device 7 Color coordinate difference calculation device 8 Calculation device for ink supply film thickness correction amount of each color 9 Each color Measurement device for the average image ratio in each section of the ink 10 Ink supply amount (opening and closing of ink key)
Claims (1)
割し、3つの独立した色座標値毎に、その分割区間で平
均した色座標値を印刷中に検出する検出手段と、制御の
目標となるべき良好な印刷物が得られた時点で、各分割
区間毎に検出された平均色座標を目標色座標として、記
憶する記憶手段と、制御機関中、時々刻々、前記検出手
段により検出された色座標と前記記憶手段により記憶さ
れた目標色座標とを比較し、その差を演算する演算手段
と、各分割区間毎に演算により求められた色座標の差と
予めの計測により求められる印刷に使用されている複数
のインキ色毎の各分割区間における平均画線率を基に、
時々刻々得られる印刷物の色座標を、記憶された目標色
座標に一致させるに必要な各色のインキ供給膜厚の修正
量を重回帰分析の手法により演算する演算手段と、イン
キ供給膜厚の修正量を偏差信号として受け、この偏差を
零とすべく、インキの供給量を調節する手段とを具えた
ことを特徴とする印刷物の色調制御装置。1. A detecting means for virtually dividing a printing surface into a plurality of pieces in a printing direction and detecting, during printing, for each of three independent color coordinate values, an averaged color coordinate value in the divided section during printing. At the time when a good printed material to be the target is obtained, the storage means for storing the average color coordinates detected for each divided section as the target color coordinates, and the control means detects the average color coordinates from time to time by the detection means. Calculating means for comparing the calculated color coordinates with the target color coordinates stored by the storage means and calculating the difference; and calculating the difference between the color coordinates obtained by calculation for each of the divided sections and the previous measurement. Based on the average image ratio in each divided section for each of the multiple ink colors used for printing,
Calculating means for calculating the amount of correction of the ink supply film thickness of each color required to match the color coordinates of the printed matter obtained from time to time with the stored target color coordinates by a method of multiple regression analysis, and correction of the ink supply film thickness Means for receiving the amount as a deviation signal and adjusting the amount of ink supply so as to make the deviation zero.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3118473A JP2831159B2 (en) | 1991-05-23 | 1991-05-23 | Color tone control device for printed matter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3118473A JP2831159B2 (en) | 1991-05-23 | 1991-05-23 | Color tone control device for printed matter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04345851A JPH04345851A (en) | 1992-12-01 |
JP2831159B2 true JP2831159B2 (en) | 1998-12-02 |
Family
ID=14737548
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Application Number | Title | Priority Date | Filing Date |
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JP3118473A Expired - Fee Related JP2831159B2 (en) | 1991-05-23 | 1991-05-23 | Color tone control device for printed matter |
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JP (1) | JP2831159B2 (en) |
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DE102006014657B4 (en) * | 2006-03-28 | 2008-11-20 | Koenig & Bauer Aktiengesellschaft | Method for color control of a printing press |
JP5556716B2 (en) | 2010-03-26 | 2014-07-23 | 日立金属株式会社 | Electromagnetic coupler and wireless terminal equipped with the same |
JP5505794B2 (en) | 2010-07-09 | 2014-05-28 | 日立金属株式会社 | Electromagnetic coupler and information communication device equipped with the same |
JP5440954B2 (en) | 2010-08-06 | 2014-03-12 | 日立金属株式会社 | Electromagnetic coupler and information communication device equipped with the same |
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1991
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