JPH0342403B2 - - Google Patents
Info
- Publication number
- JPH0342403B2 JPH0342403B2 JP57053213A JP5321382A JPH0342403B2 JP H0342403 B2 JPH0342403 B2 JP H0342403B2 JP 57053213 A JP57053213 A JP 57053213A JP 5321382 A JP5321382 A JP 5321382A JP H0342403 B2 JPH0342403 B2 JP H0342403B2
- Authority
- JP
- Japan
- Prior art keywords
- printing plate
- calibration
- area
- printing
- sensor
- 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 - Lifetime
Links
- 238000007639 printing Methods 0.000 claims description 63
- 238000001514 detection method Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 6
- 238000007645 offset printing Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 16
- 230000003287 optical effect Effects 0.000 description 10
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 241000270708 Testudinidae Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 210000001217 buttock Anatomy 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/28—Measuring arrangements characterised by the use of optical techniques for measuring areas
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Length Measuring Devices By Optical Means (AREA)
Description
【発明の詳細な説明】
本発明はオフセツト印刷技術に係り、特に印刷
絵柄面積率計のキヤリブレーシヨン方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to offset printing technology, and more particularly to a method for calibrating a printed pattern area ratio meter.
オフセツト印刷機におけるインキ供給量の調節
はインキツボ毎にインキキー開度を調整すること
により行い、インキキー開度は刷版における該当
部分の絵柄面積率つまり該当部分を構成する画線
部と非画線部との和に対し曲線部がいかなる割合
であるかに基いて定められる。 The amount of ink supplied in an offset printing machine is adjusted by adjusting the ink key opening for each ink fountain. It is determined based on the ratio of the curved section to the sum of
この絵柄面積率の測定は刷版面を光学走査しそ
の反射光量によつて画線部と非画線部とを識別す
ることにより行うもので、光学走査はオフセツト
印刷版の天地方向に複数個並設した光電センサを
横方向に移動させつつ行う。そして光学走査によ
り得られた信号のレベル検出を行つて画線部と非
画線部とを識別する。 This measurement of the picture area ratio is carried out by optically scanning the printing plate surface and distinguishing between printed areas and non-printed areas based on the amount of reflected light. This is done while moving the installed photoelectric sensor laterally. Then, the level of the signal obtained by optical scanning is detected to distinguish between the image area and the non-image area.
ここにおいて、オフセツト印刷版のうち、PS
版（Pre−Sentitized Plate）は製造工程上、そ
の表面に光学的反射率のムラを持つことが避けら
れない。 Here, among the offset printing versions, PS
Pre-Sentitized Plate inevitably has uneven optical reflectance on its surface due to the manufacturing process.
このムラは極く微細なものであればよいが、
屡々絵柄面積率の測定に誤差を生じるものであ
り、これに伴いインキ供給量制御の誤差を生じる
ことになる。 This unevenness only needs to be extremely fine, but
Errors often occur in the measurement of the pattern area ratio, which in turn causes errors in ink supply amount control.
しかしながら、従来は特開昭56−24508に示す
ようにこのための対策は特に講じられていない。 However, as shown in Japanese Unexamined Patent Publication No. 56-24508, no particular measures have been taken for this purpose.
本発明は上述の点に鑑みてなされたもので、刷
版面の光学的反射率のムラが刷版製造時の流れ方
向（以下製造方向という）には殆んどなくその直
角方向に現れることに着目し、刷版の天地方向、
左右方向の各非画線部を利用して刷版面における
光学的反射率のムラの分布状態に関するデータを
取出し、このデータに基き絵柄面積率の測定に際
して補正を行う、刷版絵柄面積率計のキヤリブレ
ーシヨン方法を提供するものである。 The present invention has been made in view of the above-mentioned points, and is based on the fact that the unevenness of optical reflectance on the printing plate surface hardly occurs in the flow direction (hereinafter referred to as the manufacturing direction) during printing plate manufacturing, but appears in the direction perpendicular to the flow direction (hereinafter referred to as the manufacturing direction). Focusing on the vertical direction of the printing plate,
This is a printing plate pattern area ratio meter that extracts data regarding the distribution state of optical reflectance unevenness on the printing plate surface using each non-image area in the left and right direction, and makes corrections when measuring the pattern area ratio based on this data. A calibration method is provided.
以下添付図面を参照して本発明の一実施例を説
明する。 An embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図はPS版の断面構造を示したものである。
これはアルミニウム板１の一面に砂目部２を設
け、この砂目部２自体を非画線部として使用し画
線部は感光性樹脂層３を塗布して構成する。つま
り砂目部２は保水性を有し、樹脂層３に油性イン
キが塗布されても砂目部２にはインキが付着しな
い。これにより画線部と非画線部とが構成され
る。 Figure 1 shows the cross-sectional structure of the PS plate.
This is constructed by providing a grained portion 2 on one surface of an aluminum plate 1, using the grained portion 2 itself as a non-image area, and applying a photosensitive resin layer 3 to the image area. In other words, the grained portions 2 have water retention properties, and even if oil-based ink is applied to the resin layer 3, no ink will adhere to the grained portions 2. This constitutes an image area and a non-image area.
第２図は第１図に示したPS板を製造するため
の工程を示したものである。PS板の基材は0.3mm
程度の厚さの圧延法により製造されたコイルであ
り、このコイルを符号４で示す。このコイル４か
ら引出されたアルミ板は脱脂装置５により表面に
付着している油脂分を除かれた上で、砂目立て装
置６に挿入される。 FIG. 2 shows the process for manufacturing the PS board shown in FIG. 1. The base material of the PS board is 0.3mm
This coil is manufactured by a rolling method to a certain thickness, and is designated by reference numeral 4. The aluminum plate pulled out from the coil 4 is inserted into a graining device 6 after oil and fat adhering to its surface are removed by a degreasing device 5.
砂目立ては、表面を粗面化し保水性を高めるた
めに行われるもので、機械研摩や電解研摩の後に
陽極酸化等が行われて処理が完了する。 Graining is performed to roughen the surface and increase water retention, and after mechanical polishing or electrolytic polishing, anodic oxidation or the like is performed to complete the treatment.
砂目立て処理の後、砂目面上に塗布装置７によ
つて感光性樹脂層が塗布され、乾燥装置８で乾燥
された上でコイル９として巻取られる。 After the graining process, a photosensitive resin layer is applied onto the grained surface by a coating device 7, dried by a drying device 8, and then wound into a coil 9.
PS版はこのように一定方向に移動しつつ処理
がなされる。 In the PS version, processing is performed while moving in a fixed direction like this.
第３図ａ，ｂはこの製造方向と裁断された刷版
との関係を示したもので、同図ａは製造時にPS
版が移動する方向（以下製造方向という）を天地
方向とした場合、同図ｂは製造方向と直角方向を
天地方向とした場合をそれぞれ示している。この
うち同図ａが一般的であり、同図ｂは機械的強度
の点から同図ａよりも一般的ではない。 Figure 3 a and b show the relationship between this manufacturing direction and the cut printing plate, and figure a shows the PS during manufacturing.
When the direction in which the plate moves (hereinafter referred to as the manufacturing direction) is taken as the vertical direction, Figure b shows the case where the vertical direction is taken as the direction perpendicular to the manufacturing direction. Of these, the one shown in the figure a is common, and the one shown in the figure b is less common than the one shown in the figure a from the viewpoint of mechanical strength.
何れにしても刷版の裁断は製造方向に対し常に
一定の方向に行われるものではない
一方、刷版面の光学的反射率のムラほ製造方向
に殆んどなくその直角方向に現れる。 In any case, printing plates are not always cut in a constant direction with respect to the manufacturing direction, but on the other hand, unevenness in the optical reflectance of the printing plate surface is almost never in the manufacturing direction and appears in a direction perpendicular to the manufacturing direction.
したがつて刷版面の光学的反射率のムラを検出
するには天地方向および左右方向の両者について
それぞれ検出することが必要である。そして、こ
の検出は天地方向、左右方向の各々における非画
線部を一端から他端まで行う。通常の場合、刷版
はその周縁部分が非画線部分であるから、天地方
向に関しては天地縁辺または地部縁辺によつて、
左右方向に関しては左側または右側の縁辺によつ
て光学的反射率を検出する。ここで例えば地部に
はキヤリブレーシヨンマークと称する画線部中の
ベタ部と同様のベタマークが付されているから、
これは区別して取扱うことを要する。 Therefore, in order to detect unevenness in the optical reflectance of the printing plate surface, it is necessary to detect it both in the vertical direction and in the horizontal direction. This detection is performed from one end to the other end of the non-printing portion in each of the vertical and horizontal directions. Normally, the periphery of a printing plate is a non-printing area, so in the vertical direction, depending on the top and bottom edges or the bottom edge,
In the left-right direction, the optical reflectance is detected by the left or right edge. For example, the ground area has a solid mark called a calibration mark that is similar to the solid area in the drawing area, so
This needs to be treated separately.
次に本発明により絵柄面積率の測定結果を補正
する方法を具体的に説明する。 Next, a method for correcting the measurement result of the pattern area ratio according to the present invention will be specifically explained.
この方法は、刷版の左右方向の一方の縁辺およ
び天地方向の一方の縁辺を第１および第２のキヤ
リブレーシヨン領域として設定し、第４図、第５
図に示すような刷版絵柄面積率計で刷版面から得
た検出値中、前記各キヤリブレーシヨン領域から
の検出値によりキヤリブレーシヨン係数を算出
し、このキヤリブレーシヨン係数により前記刷版
絵柄面積率の検出値を補正するようにしたもので
ある。 In this method, one edge in the horizontal direction and one edge in the vertical direction of the printing plate are set as the first and second calibration areas, and
Among the detected values obtained from the printing plate surface using a printing plate pattern area ratio meter as shown in the figure, a calibration coefficient is calculated from the detection values from each calibration area, and the calibration coefficient is used to calculate the printing plate pattern. The detected value of area ratio is corrected.
絵柄面積率計およびその検出値
絵柄面積率計は、オフセツト印刷版の天地方向
に複数個配列したセンサを左右方向に移動させて
刷版面を走査し、刷版上に照射した光の反射光量
を検出し、この反射光量から刷版の絵柄面積を測
定するものである。そして天地方向に配列した複
数個のセンサ中ｍ番目のセンサにおいて所定時間
間隔毎に行われる走査のｎ回目の走査時の検出値
をVm、ｎと呼ぶ。Image area ratio meter and its detected value Image area ratio meter scans the printing plate surface by moving a plurality of sensors arranged in the vertical direction of the offset printing plate in the horizontal direction, and measures the amount of reflected light irradiated onto the printing plate. The pattern area of the printing plate is measured from the amount of reflected light. The detected value at the n-th scan performed at predetermined time intervals by the m-th sensor among the plurality of sensors arranged in the vertical direction is called Vm,n.
第１のキヤリブレーシヨン領域
刷版の左右方向の何れかの縁辺、例えば左端縁
の非画線部を第１のキヤリブレーシヨン領域とす
る。この領域から取出した検出信号を刷版の天地
方向の反射ムラとセンサの感度ムラの補正に用い
る。First Calibration Area A non-printing area on either side of the printing plate in the left or right direction, for example, the left edge, is defined as the first calibration area. The detection signal extracted from this area is used to correct uneven reflection of the printing plate in the vertical direction and uneven sensitivity of the sensor.
第２のキヤリブレーシヨン領域
刷版の天地方向の何れかの縁辺、例えば咬尻部
を第２のキヤリブレーシヨン領域とする。この領
域から取出した検出信号を刷版の左右方向の反射
ムラの補正に用いる。Second Calibration Area Any edge of the printing plate in the vertical direction, for example, the buttock, is defined as the second calibration area. The detection signal extracted from this area is used to correct reflection unevenness in the horizontal direction of the printing plate.
この領域は、センサの０番目のセンサによつて
反射光量の検出が行われるので、このセンサをキ
ヤリブレーシヨンセンサと呼ぶ。 In this area, the amount of reflected light is detected by the 0th sensor, so this sensor is called a calibration sensor.
第１のキヤリブレーシヨン係数
第１のキヤリブレーシヨン領域において１乃至
ｉ回目の走査検出が行われるとき、ｍ番目のセン
サおよびキヤリブレーシヨンセンサの各検出値
（Vm、ｍおよびVo、ｎ）から第１のキヤリブレ
ーシヨン係数Cm′を下記(1)式によつて計算する。First calibration coefficient When the first to i-th scanning detection is performed in the first calibration area, from each detection value (Vm, m and Vo, n) of the m-th sensor and the calibration sensor, The first calibration coefficient Cm' is calculated by the following equation (1).
Cm′＝１／ｉ×i
〓n=1
Vo、ｎ／Vm、ｎ ……(1)
正規化検出値
せンサの検出値Vm、ｎ、キヤリブレーシヨン
センサの検出値Vo、ｎおよび第１のキヤリブレ
ーシヨン係数Cm′から、刷版の絵柄領域における
センサの正規化検出値Em、ｎを下記(2)式によつ
て計算する。 Cm' = 1 / i From the calibration coefficient Cm', the normalized detection value Em,n of the sensor in the picture area of the printing plate is calculated by the following equation (2).
Em、ｎ＝Cm′×Vm、ｎ／Vo、ｎ ……(2)
ただし、刷版非画線部の正規化検出値は１であ
る。また１／Vo、ｎ＝Cn2としてCn2を第２のキヤ
リブレーシヨン係数と呼び(2)式を下記(2)′式のよ
うに表わすことができる。 Em, n=Cm'×Vm, n/Vo, n (2) However, the normalized detection value of the non-image area of the printing plate is 1. Further, with 1/Vo and n=Cn 2 , Cn 2 is referred to as the second calibration coefficient, and the equation (2) can be expressed as the following equation (2)'.
Em、ｎ＝Cm′×Cn′×Vm、ｎ ……(2)′
キヤリブレーシヨンマークの処理
キヤリブレーシヨンセンサがキヤリブレーシヨ
ンマーク（画線ベタマーク）を検出した場合、例
えばｒｎｓにおいて検出値Vo、ｎが画線ベ
タマークの検出値であるときはVo、ｎ（ｒｎ
ｓ）に代えて下記(3)式で示される。Vp、ｎを(2)
式に適用する。 Em, n = Cm' , n is the detection value of a solid mark, then Vo, n(rn
s) is represented by the following formula (3). V p , n(2)
Applies to expressions.
■■■ 亀の甲 ［0001］ ■■■
これは簡易法としてVp、ｒ−１で代替しても
よいし、Vp、ｒ−１＋Vp、ｓ＋１／２を使つてもよ
い。■■■ Turtle Shell [0001] ■■■ This may be replaced with V p and r-1 as a simplified method, or V p , r-1+V p and s+1/2 may be used.
キヤリブレーシヨンマークの識別
検出値Vp、ｎが非画線部の検出値であるかキ
ヤリブレーシヨンマークの検出であるかの識別は
例えば下記方法１または２により行う。Identification of Calibration Mark Identification of whether the detected values V p , n are detected values of a non-image area or of a calibration mark is performed, for example, by method 1 or 2 below.
（方法１）
キヤリブレーシヨンマークを刷版の特定の位置
に付す。この結果上記ｒ、ｓが所定値となるから
識別できる。(Method 1) A calibration mark is attached to a specific position on the printing plate. As a result, the above r and s become predetermined values, so it can be identified.
（方法２）
キヤリブレーシヨンマークの反射率は非画線部
と比較し通常1/2以下であつて非常に小さいので、
例えば非画線部の検出値の0.7以下であればキヤ
リブレーシヨンマークとみなす。つまり、第１の
キヤリブレーシヨン領域において１〜ｉ回目の走
査時の検出が行われるとき下記(4)式まで与えられ
るＫが0.7以下のときキヤリブレーシヨンマーク
の検出とみなす。(Method 2) The reflectance of the calibration mark is usually less than 1/2 that of the non-image area, which is very small.
For example, if the detected value of the non-image area is 0.7 or less, it is considered a calibration mark. That is, when the first to i-th scanning detections are performed in the first calibration area, if K given to the equation (4) below is 0.7 or less, it is considered that a calibration mark has been detected.
■■■ 亀の甲 ［0002］ ■■■
正規化対応値
印刷機のｈ番目のインキキーに対応した刷版領
域での正規化検出値Em、ｎがｊｍｋ、ｐ
ｎｑの範囲であるときｈ番目のインキキーに対
応する正規化対応値Fhを下記(5)式によつて計算
する。■■■ Tortoise shell [0002] ■■■ Normalized corresponding value Normalized detected value Em, n in the printing plate area corresponding to the hth ink key of the printing press is jmk, p
When the range is nq, the normalized corresponding value Fh corresponding to the h-th ink key is calculated by the following equation (5).
Fh＝１／（ｊ−ｋ−１）（ｐ−ｑ−１）k
〓m=j q
〓n=p
Em、ｎ
……(5)
正規化平均値
キヤリブレーシヨンマークの検出値Vp、ｎ（ｒ
ｎｓ）の正規化平均値Minを下記(6)式によつ
て計算する。Fh=1/(j-k-1)(p-q-1) k 〓 m=j q 〓 n=p Em, n
...(5) Normalized average value Calibration mark detection value V p , n(r
The normalized average value Min of ns) is calculated by the following equation (6).
Min＝１／（ｓ−１）−ｒs
〓n=r
Vp、ｎ／１／ｉi
〓n=1
Vp、
ｎ ……(6)
絵柄面積率
印刷機のｈ番目のインキキーに対応した刷版絵
柄面積率〔％〕は下記(7)式によつて計算する。 Min=1/(s-1) -rs 〓 n=r V p , n/1/i i 〓 n=1 V p ,
n...(6) Image area ratio The printing plate image area ratio [%] corresponding to the h-th ink key of the printing press is calculated by the following formula (7).
ｐ＝Fh−Min／１−Min×100 ……(7)
これにより刷版の光学的反射率のムラに起因す
る誤差を含まない絵柄面積率が得られる。このよ
うな演算はマイクロコンピユータ等を利用した公
知方法で行い得る。 p=Fh−Min/1−Min×100 (7) As a result, a picture area ratio that does not include errors caused by uneven optical reflectance of the printing plate can be obtained. Such calculations can be performed by a known method using a microcomputer or the like.
第４図は絵柄面積率計のセンサと刷版との位置
関係を示したもので、同図に示す如く一列状に配
設された光電センサ１０の下方には別途後述する
搬送装置によつて印刷版２０が搬送されるように
なつており、ここで検出走査が線状に行われる。
しかして、ここで、使用される印刷版２０には印
刷版の咬え２１（咬え尻２２又は印刷に悪影響を
及ぼさない部分）に長方形状又はその他の形状の
キヤリブレーシヨンマーク２３が付されており、
あるいは画線部中のベタ部分が当該マークとして
設定されており、このキヤリブレーシヨンマーク
２３によつて非画線部（Al砂目部）２４と画線
部２５とを識別するようになつている。また、光
電センサ１０は線状の照射面を形成し得るような
１対の柱状蛍光灯１１及び１２を具備すると共
に、その蛍光灯１１及び１２の中間部には第５図
に示す如き一列状に配設されたSp，S1，S2，…So
の光電検出器１３が設けられている。しかして、
この光電検出器１３（S0〜So）の回路構成は第５
図に示す如く、印刷版２０からの反射光を受光し
て光電変換するフオトダイオードPDと、この出
力を一方の入力とする演算増幅器（他方の入力は
接地されている）OPと、この演算増幅器OPの入
出力間に接続された抵抗Ｒ及びコンデンサＣとで
成つている。 Figure 4 shows the positional relationship between the sensor of the picture area ratio meter and the printing plate. The printing plate 20 is conveyed, and detection scanning is performed here in a linear manner.
Therefore, the printing plate 20 used here is provided with a calibration mark 23 in a rectangular or other shape on the edge 21 (edge 22 or part that does not adversely affect printing) of the printing plate. and
Alternatively, a solid portion in the image area is set as the mark, and the calibration mark 23 is used to distinguish between the non-image area (Al grained area) 24 and the image area 25. There is. Further, the photoelectric sensor 10 is equipped with a pair of columnar fluorescent lamps 11 and 12 that can form a linear irradiation surface, and the intermediate portion of the fluorescent lamps 11 and 12 is arranged in a line shape as shown in FIG. S p , S 1 , S 2 ,...S o arranged in
A photoelectric detector 13 is provided. However,
The circuit configuration of this photoelectric detector 13 (S 0 to S o ) is the fifth
As shown in the figure, there is a photodiode PD that receives reflected light from the printing plate 20 and converts it photoelectrically, an operational amplifier OP that uses this output as one input (the other input is grounded), and this operational amplifier. It consists of a resistor R and a capacitor C connected between the input and output of OP.
上記実施例では、刷版の天地方向および左右方
向のそれぞれに少くとも１つの非画線部があるも
のとして説明したが、実際には例えば左右方向に
非画線部のないことがある。この場合には、刷版
製造時に同一ロツトから製造された他の刷版を利
用して光学的反射率のムラを検出する。一般に刷
版は製造時における陽極酸化の裏側への回り込み
等による製造方向判別に用い得る表象があるか
ら、これを利用して検出しようとする刷版と同一
条件の検出ができる。また、他の刷版を用いずに
白い基準部材を利用してもよい。 In the above embodiment, the printing plate is described as having at least one non-printing area in each of the vertical and horizontal directions, but in reality, for example, there may be no non-printing area in the horizontal direction. In this case, when printing plates are manufactured, other printing plates manufactured from the same lot are used to detect unevenness in optical reflectance. In general, printing plates have markings that can be used to determine the manufacturing direction, such as when the anodization wraps around to the back side during manufacturing, and this can be used to detect the printing plate under the same conditions as the printing plate to be detected. Alternatively, a white reference member may be used without using any other printing plate.
本発明は上述のように、刷版の天地方向および
左右方向の非画線部またはこれに代るものを利用
して刷版面における光学的反射率のムラの分布デ
ータを取出し、このデータに基き絵柄面積率の測
定結果を補正するようにしたため、版そのものの
ムラは勿論のこと、光源光量の分布ムラやセンサ
感度のばらつきを含めた補正ができ、絵柄面積率
計の測定精度を著しく向上することができる。 As described above, the present invention extracts distribution data of optical reflectance unevenness on the printing plate surface using the non-printing areas in the vertical and horizontal directions of the printing plate, or an alternative thereto, and based on this data. Since the measurement result of the pattern area ratio is corrected, it is possible to correct not only the unevenness of the plate itself, but also the uneven distribution of the light source light amount and the variation in sensor sensitivity, which significantly improves the measurement accuracy of the pattern area ratio meter. be able to.
第１図はオフセツト印刷版中のPS版の構造を
示す断面図、第２図はPS版の製造工程の説明図、
第３図は刷版とPS版の製造方向との関係を示す
説明図、第４図は絵柄面積率計におけるセンサと
刷版との位置関係を示す図、第５図は同センサに
よる検出走査の説明図である。
１……アルミニウム板、２……砂目部、３……
感光性樹脂層、４……アルミニウム板ロール、５
……脱脂装置、７……感光樹脂層塗布装置、８…
…乾燥装置、９……PS版ロール、１０……セン
サ。
Figure 1 is a sectional view showing the structure of the PS plate in the offset printing plate, Figure 2 is an explanatory diagram of the PS plate manufacturing process,
Figure 3 is an explanatory diagram showing the relationship between the printing plate and the manufacturing direction of the PS plate, Figure 4 is a diagram showing the positional relationship between the sensor in the picture area ratio meter and the printing plate, and Figure 5 is the detection scan by the same sensor. FIG. 1... Aluminum plate, 2... Grained portion, 3...
Photosensitive resin layer, 4... Aluminum plate roll, 5
...Degreasing device, 7...Photosensitive resin layer coating device, 8...
...Drying device, 9...PS plate roll, 10...sensor.
Claims (1)
がら光を照射しセンサで検出せるその反射光量か
ら測定した前記刷版の絵柄面積率を、測定時に混
入する誤差に応じて補正する刷版絵柄面積率計の
キヤリブレーシヨン方法において、前記刷版の左
右方向の何れか１つの縁辺非画線部またはこれに
代わり得る部材を第１のキヤリブレーシヨン領域
とし、この領域の検出信号により前記刷版の天地
方向の反射ムラ、前記センサの感度ムラおよび光
源光量の分布ムラを補正し、前記刷版の天地方向
の何れか１つの縁辺またはこれに代わり得る部材
を第２のキヤリブレーシヨン領域とし、前記刷版
の左右方向の反射ムラを補正すると共に、前記キ
ヤリブレーシヨン領域の何れかに設けられたキヤ
リブレーシヨンマークを用いて画線部ペタ部のキ
ヤリブレーシヨン値を取出すようにしたことを特
徴とする刷版絵柄面積率計のキヤリブレーシヨン
方法。1 A printing plate pattern area that corrects the pattern area ratio of the printing plate, which is measured from the amount of reflected light by irradiating light while scanning the detection area of the printing plate for offset printing and detecting it by a sensor, according to errors introduced during measurement. In the calibration method for a rate meter, one of the non-printing edge areas in the left and right directions of the printing plate or a member that can replace this is defined as a first calibration area, and a detection signal of this area causes the printing plate to correcting uneven reflection in the vertical direction of the printing plate, uneven sensitivity of the sensor, and uneven distribution of the amount of light from the light source, and setting any one edge of the printing plate in the vertical direction or a member that can replace this as a second calibration area; In addition to correcting the reflection unevenness in the horizontal direction of the printing plate, the calibration value of the print area is extracted using a calibration mark provided in any of the calibration areas. Calibration method of printing plate pattern area ratio meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57053213A JPS58169011A (en) | 1982-03-31 | 1982-03-31 | Calibration method for area ratio meter for plate pattern |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57053213A JPS58169011A (en) | 1982-03-31 | 1982-03-31 | Calibration method for area ratio meter for plate pattern |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58169011A JPS58169011A (en) | 1983-10-05 |
| JPH0342403B2 true JPH0342403B2 (en) | 1991-06-27 |
Family
ID=12936554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57053213A Granted JPS58169011A (en) | 1982-03-31 | 1982-03-31 | Calibration method for area ratio meter for plate pattern |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58169011A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58201010A (en) * | 1982-05-19 | 1983-11-22 | Komori Printing Mach Co Ltd | Method for calibrating pattern signal |
| JPS6352005A (en) * | 1986-08-22 | 1988-03-05 | Toppan Printing Co Ltd | Measuring method for pattern area rate |
| JP2609522B2 (en) * | 1987-05-25 | 1997-05-14 | 株式会社小森コーポレーション | Method of determining whether color patches are valid or invalid in automatic density management device |
-
1982
- 1982-03-31 JP JP57053213A patent/JPS58169011A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58169011A (en) | 1983-10-05 |
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